chore: Update README.md

* refactor: export Settings type, Setup returns value

* refactor: resolver.Setup takes explicit Settings struct

* refactor: GetHeadersWithoutTrustedHeaders takes explicit header params

* refactor: server constructors take narrow config

* refactor: Router struct with handler methods, remove geoSvc global

* refactor: wire DI through main, remove setting.App references

* refactor: remove App global, use returned Settings

* refactor: update router tests for DI

* chore: fix lint issues — rename ServerTimeouts to Timeouts, fix shadowed variables

.github/workflows/codeql-analysis.yml

@@ -31,16 +31,16 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: install go
-      uses: actions/setup-go@v5
+      uses: actions/setup-go@v6
       with:
         go-version-file: go.mod
         cache: true
 
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v3
+      uses: github/codeql-action/init@v4
       with:
         languages: go
 
@@ -49,4 +49,4 @@ jobs:
        make build
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v3
+      uses: github/codeql-action/analyze@v4

.github/workflows/main.yml

@@ -17,29 +17,38 @@ jobs:
       matrix:
         make: ["lint", "unit-test", "integration-test"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: install go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version-file: go.mod
 
       - name: ${{ matrix.make }}
         run: make ${{ matrix.make }}
 
-  deploy:
+  build-binaries:
     runs-on: ubuntu-latest
     needs: tests
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
     strategy:
       matrix:
-        goosarch: [linux-amd64]
+        include:
+          - goos: linux
+            goarch: amd64
+          - goos: linux
+            goarch: arm64
+          - goos: darwin
+            goarch: amd64
+          - goos: darwin
+            goarch: arm64
+          - goos: windows
+            goarch: amd64
     steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
+      - uses: actions/checkout@v6
+
       - name: install go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version-file: go.mod
           cache: true
@@ -47,27 +56,94 @@ jobs:
       - name: Set env
         run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
 
-      - name: Sign in to dockerhub
-        run: echo "${{ secrets.DOCKERHUB_TOKEN }}" | docker login -u ${{ secrets.DOCKERHUB_USERNAME }} --password-stdin
-
-      - name: Deploy image
-        run: make docker-push VERSION=$RELEASE_VERSION
-
       - name: Build
-        run: make build VERSION=$RELEASE_VERSION
+        run: make build VERSION="$RELEASE_VERSION" GOOS=${{ matrix.goos }} GOARCH=${{ matrix.goarch }}
 
-      - name: Prepare release
+      - name: Package
+        run: |
+          BASE="whatismyip-$RELEASE_VERSION-${{ matrix.goos }}-${{ matrix.goarch }}"
+          if [ "${{ matrix.goos }}" = "windows" ]; then
+            cp whatismyip "${BASE}.exe"
+            zip "${BASE}.zip" "${BASE}.exe" LICENSE README.md
+            sha256sum "${BASE}.zip" > "${BASE}.zip.sha256"
+          else
+            tar zcvf "${BASE}.tar.gz" whatismyip LICENSE README.md
+            sha256sum "${BASE}.tar.gz" > "${BASE}.tar.gz.sha256"
+          fi
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v6
+        with:
+          name: binary-${{ matrix.goos }}-${{ matrix.goarch }}
+          path: |
+            whatismyip-${{ env.RELEASE_VERSION }}-${{ matrix.goos }}-${{ matrix.goarch }}.*
+          if-no-files-found: error
+
+  publish-docker:
+    runs-on: ubuntu-latest
+    needs: tests
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set env
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: Sign in to Docker Hub
+        uses: docker/login-action@v4
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          build-args: ARG_VERSION=${{ env.RELEASE_VERSION }}
+          tags: |
+            ${{ secrets.DOCKERHUB_USERNAME }}/whatismyip:${{ env.RELEASE_VERSION }}
+            ${{ secrets.DOCKERHUB_USERNAME }}/whatismyip:latest
+          push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  release:
+    runs-on: ubuntu-latest
+    needs: [build-binaries, publish-docker]
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Set env
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Download all artifacts
+        uses: actions/download-artifact@v6
+        with:
+          pattern: binary-*
+          merge-multiple: true
+
+      - name: Generate changelog
         run: |
           git log $(git describe HEAD~ --tags --abbrev=0)..HEAD --pretty='format:%h - %s <%an>' --no-merges > changelog.txt
-          tar  zcvf whatismyip-$RELEASE_VERSION-${{matrix.goosarch}}.tar.gz whatismyip LICENSE README.md
-          sha256sum whatismyip-$RELEASE_VERSION-${{matrix.goosarch}}.tar.gz > whatismyip-$RELEASE_VERSION-${{matrix.goosarch}}.tar.gz.sha256
 
       - name: Release
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@v3
         with:
           body_path: changelog.txt
           files: |
-            whatismyip-${{env.RELEASE_VERSION}}-${{matrix.goosarch}}.tar.gz
-            whatismyip-${{env.RELEASE_VERSION}}-${{matrix.goosarch}}.tar.gz.sha256
+            whatismyip-${{ env.RELEASE_VERSION }}-*.tar.gz
+            whatismyip-${{ env.RELEASE_VERSION }}-*.tar.gz.sha256
+            whatismyip-${{ env.RELEASE_VERSION }}-*.zip
+            whatismyip-${{ env.RELEASE_VERSION }}-*.zip.sha256
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -1 +1,2 @@
 whatismyip
+dist/

.golangci.yaml

@@ -1,49 +1,72 @@
----
-run:
-  timeout: 10m
-issues:
-  max-same-issues: 0
+version: "2"
 linters:
-  disable-all: true
+  default: none
   enable:
-    - goimports
+    - errcheck
+    - errorlint
+    - govet
     - ineffassign
     - nakedret
     - revive
     - staticcheck
-    - stylecheck
     - unconvert
     - unparam
     - unused
-linters-settings:
-  staticcheck:
-    checks:
-      - all
-  revive:
-    ignore-generated-header: true
-    severity: warning
-    confidence: 0.8
+  settings:
+    revive:
+      confidence: 0.8
+      severity: warning
+      rules:
+        - name: blank-imports
+        - name: context-as-argument
+        - name: context-keys-type
+        - name: dot-imports
+        - name: error-return
+        - name: error-strings
+        - name: error-naming
+        - name: exported
+        - name: increment-decrement
+        - name: var-naming
+        - name: var-declaration
+        - name: package-comments
+        - name: range
+        - name: receiver-naming
+        - name: time-naming
+        - name: unexported-return
+        - name: indent-error-flow
+        - name: errorf
+        - name: empty-block
+        - name: superfluous-else
+        - name: unused-parameter
+        - name: unreachable-code
+        - name: redefines-builtin-id
+    staticcheck:
+      checks:
+        - all
+  exclusions:
+    generated: lax
     rules:
-      - name: blank-imports
-      - name: context-as-argument
-      - name: context-keys-type
-      - name: dot-imports
-      - name: error-return
-      - name: error-strings
-      - name: error-naming
-      - name: exported
-      - name: increment-decrement
-      - name: var-naming
-      - name: var-declaration
-      - name: package-comments
-      - name: range
-      - name: receiver-naming
-      - name: time-naming
-      - name: unexported-return
-      - name: indent-error-flow
-      - name: errorf
-      - name: empty-block
-      - name: superfluous-else
-      - name: unused-parameter
-      - name: unreachable-code
-      - name: redefines-builtin-id
+      - linters:
+          - revive
+        path: internal/metrics/
+        text: "var-naming: avoid package names that conflict with Go standard library package names"
+    presets:
+      - comments
+      - common-false-positives
+      - legacy
+      - std-error-handling
+    paths:
+      - third_party$
+      - builtin$
+      - examples$
+issues:
+  max-same-issues: 0
+formatters:
+  enable:
+    - goimports
+  exclusions:
+    generated: lax
+    paths:
+      - third_party$
+      - builtin$
+      - examples$

AGENTS.md

@@ -0,0 +1,68 @@
+# whatismyip
+
+Single-binary Go service: HTTP/TLS/QUIC server that returns the client's IP, geolocation, ASN, headers, TCP port scan, and DNS discovery. Uses [gin](https://github.com/gin-gonic/gin) + [httprouter](https://github.com/julienschmidt/httprouter). Requires Go >= 1.25.
+
+## Commands
+
+```sh
+make build                                           # CGO_ENABLED=0 -> ./whatismyip (GOOS/GOARCH for cross-compile)
+make build-all                                       # cross-compile all 5 platforms into dist/
+make unit-test                                       # go test -count=1 -race -short -cover ./...
+make integration-test                                # requires Docker; runs integration-tests/ module
+make test                                            # unit-test + integration-test
+make lint                                            # gofmt -l + golangci-lint + shadow (auto-installs tools)
+make docker-build                                    # local single-arch build (root Dockerfile)
+make docker-run                                      # builds dev image + runs with test DBs, ports :8080 :8081 :9100
+```
+
+**Order and quirks**: `lint -> unit-test -> integration-test`. Integration tests use testcontainers-go (needs Docker). They are a separate Go module with its own `go.mod` — run from the `integration-tests/` directory. They use `test/Dockerfile` (distinct from the root `Dockerfile`).
+
+## Architecture
+
+```
+cmd/whatismyip.go          # entrypoint: parses flags, wires servers, runs
+├── server/server.go       # Manager: Start/Stop/SIGHUP-reload for all server types
+├── server/tcp.go          # plain HTTP
+├── server/tls.go          # TLS/HTTP2
+├── server/quic.go         # HTTP/3 (requires TLS server)
+├── server/dns.go          # micro-DNS server for discovery
+├── server/prometheus.go   # separate metrics endpoint
+├── router/setup.go        # Gin route registration
+│   ├── router/generic.go  # /, /client-port, /all, /json
+│   ├── router/geo.go      # /geo/*, /asn/*
+│   ├── router/headers.go  # /headers, /:header
+│   ├── router/dns.go      # DNS discovery HTTP handler
+│   ├── router/port_scanner.go  # /scan/tcp/:port
+│   └── router/templates.go     # embedded HTML template
+├── service/geo.go         # GeoIP lookup service (MaxMind MMDB)
+├── service/port_scanner.go
+├── resolver/setup.go      # authoritative micro-DNS server (miekg/dns)
+├── internal/setting/      # flag parsing + resolver YAML config
+├── internal/httputils/    # header filtering and formatting
+├── internal/metrics/      # Prometheus counters/histograms (opt-in)
+├── internal/validator/uuid/
+├── internal/core/version.go
+└── models/geo.go          # GeoDB wrapper around oschwald/maxminddb-golang
+```
+
+## Key facts
+
+- **DNS discovery**: enabled via `-resolver test/resolver.yml`. The resolver is an authoritative DNS server answering for a subdomain. Clients prove their DNS provider by resolving `<uuid>.dns.<domain>`.
+- **Geo**: both `-geoip2-city` and `-geoip2-asn` required together (or omitted). Uses test DBs in `test/`.
+- **Trusted headers**: `-trusted-header X-Real-IP` for proxy mode. When set without `-trusted-port-header`, client port shows "unknown".
+- **SIGHUP**: reloads GeoIP databases and restarts all servers without full stop.
+- **HTTP/3**: requires `-tls-bind`; reuses its port for UDP.
+- **Prometheus**: separate process/port via `-metrics-bind`. Metrics prefixed `whatismyip_*`.
+- **Port scan**: enabled by default; disable with `-disable-scan`.
+- **Embedded template**: `router/templates.go` has the default `home` template. `-template` overrides.
+- **Version**: injected at build via `-ldflags="-X 'github.com/dcarrillo/whatismyip/internal/core.Version=${VERSION}'"`.
+
+## Testing quirks
+
+- Integration tests need Docker (testcontainers-go) and will take longer. They run against a real containerized build.
+- Unit tests in `internal/setting/`, `internal/httputils/`, `internal/metrics/`, `internal/validator/uuid/`, `models/`, `router/`, and `service/` use test DBs from `test/`.
+- The router test reads `test/` resources by relative path — run from repo root.
+
+## Lint
+
+Uses `golangci-lint` v2 config (`.golangci.yaml`) with strict `revive` rules and `goimports` as formatter. One exception: `internal/metrics/` gets a pass on `var-naming` (package name conflicts with stdlib `metrics`). Also runs `shadow` and `gofmt -l -d`.

Dockerfile

@@ -1,28 +1,20 @@
-FROM golang:1.22-alpine as builder
+FROM --platform=$BUILDPLATFORM golang:1.25-alpine AS builder
 
 ARG ARG_VERSION
-ENV VERSION $ARG_VERSION
+ARG TARGETOS
+ARG TARGETARCH
+ENV VERSION=$ARG_VERSION
 
 WORKDIR /app
-COPY go.mod .
-COPY go.sum .
+COPY go.mod go.sum ./
 RUN --mount=type=cache,target=/go/pkg/mod/ go mod download -x
 COPY . .
 
-FROM builder AS build-dev-app
-# hadolint ignore=DL3018
-RUN --mount=type=cache,target=/go/pkg/mod/ apk --no-cache add make && make build
+RUN --mount=type=cache,target=/go/pkg/mod/ apk --no-cache add make ca-certificates \
+    && update-ca-certificates \
+    && GOOS=$TARGETOS GOARCH=$TARGETARCH make build
 
-FROM builder AS build-prod-app
-# hadolint ignore=DL3018
-RUN --mount=type=cache,target=/go/pkg/mod/ apk --no-cache add make upx \
-    && make build \
-    && upx --best --lzma whatismyip
-
-FROM scratch AS dev
-COPY --from=build-dev-app /app/whatismyip /usr/bin/
-ENTRYPOINT ["whatismyip"]
-
-FROM scratch AS prod
-COPY --from=build-prod-app /app/whatismyip /usr/bin/
+FROM scratch
+COPY --from=builder /app/whatismyip /usr/bin/
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 ENTRYPOINT ["whatismyip"]

Makefile

@@ -1,6 +1,8 @@
 GOPATH ?= $(shell go env GOPATH)
 VERSION ?= devel-$(shell git rev-parse --short HEAD)
 DOCKER_URL ?= dcarrillo/whatismyip
+GOOS ?= $(shell go env GOOS)
+GOARCH ?= $(shell go env GOARCH)
 
 .PHONY: test
 test: unit-test integration-test
@@ -9,18 +11,20 @@ unit-test:
 	go test -count=1 -race -short -cover ./...
 
 integration-test:
-	go test -count=1 -v ./integration-tests
+	cd integration-tests && go test -count=1 -v ./...
 
 install-tools:
-	@command golangci-lint > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
-		curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(GOPATH)/bin; \
+	@if ! command -v golangci-lint &> /dev/null; then \
+		echo "Installing golangci-lint"; \
+		curl -sSfL https://golangci-lint.run/install.sh | sh -s -- -b $(GOPATH)/bin; \
 	fi
 
-	@command $(GOPATH)/revive > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
-		go get -u github.com/mgechev/revive; \
-	fi
+	@if ! command -v revive &> /dev/null; then \
+		echo "Installing revive..."; \
+    	go install github.com/mgechev/revive@latest; \
+	fi	
 
-	@command $(GOPATH)/shadow > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+	@if ! command -v shadow &> /dev/null; then \
 		go install golang.org/x/tools/go/analysis/passes/shadow/cmd/shadow@latest; \
 	fi
 
@@ -30,29 +34,32 @@ lint: install-tools
 	shadow ./...
 
 build:
-	CGO_ENABLED=0 go build -ldflags="-s -w -X 'github.com/dcarrillo/whatismyip/internal/core.Version=${VERSION}'" -o whatismyip ./cmd
+	CGO_ENABLED=0 GOOS=$(GOOS) GOARCH=$(GOARCH) go build -ldflags="-s -w -X 'github.com/dcarrillo/whatismyip/internal/core.Version=${VERSION}'" -o whatismyip ./cmd
 
-docker-build-dev:
-	docker build --target=dev --build-arg=ARG_VERSION="${VERSION}" --tag ${DOCKER_URL}:${VERSION} .
+build-all:
+	@mkdir -p dist
+	GOOS=linux GOARCH=amd64 $(MAKE) build && mv whatismyip dist/whatismyip-linux-amd64
+	GOOS=linux GOARCH=arm64 $(MAKE) build && mv whatismyip dist/whatismyip-linux-arm64
+	GOOS=darwin GOARCH=amd64 $(MAKE) build && mv whatismyip dist/whatismyip-darwin-amd64
+	GOOS=darwin GOARCH=arm64 $(MAKE) build && mv whatismyip dist/whatismyip-darwin-arm64
+	GOOS=windows GOARCH=amd64 $(MAKE) build && mv whatismyip dist/whatismyip-windows-amd64.exe
 
-docker-build-prod:
-	docker build --target=prod --build-arg=ARG_VERSION="${VERSION}" --tag ${DOCKER_URL}:${VERSION} .
+docker-build:
+	docker build --build-arg=ARG_VERSION="${VERSION}" --tag ${DOCKER_URL}:${VERSION} .
 
-docker-push: docker-build-prod
-ifneq (,$(findstring devel-,$(VERSION)))
-	@echo "VERSION is set to ${VERSION}, I can't push devel builds"
-	exit 1
-else
-	docker push ${DOCKER_URL}:${VERSION}
-	docker tag ${DOCKER_URL}:${VERSION} ${DOCKER_URL}:latest
-	docker push ${DOCKER_URL}:latest
-endif
-
-docker-run: docker-build-dev
+docker-run: docker-build
 	docker run --tty --interactive --rm \
-	-v ${PWD}/test/GeoIP2-City-Test.mmdb:/tmp/GeoIP2-City-Test.mmdb:ro \
-	-v ${PWD}/test/GeoLite2-ASN-Test.mmdb:/tmp/GeoLite2-ASN-Test.mmdb:ro -p 8080:8080 \
-	${DOCKER_URL}:${VERSION} \
-		-geoip2-city /tmp/GeoIP2-City-Test.mmdb \
-		-geoip2-asn /tmp/GeoLite2-ASN-Test.mmdb \
-		-trusted-header X-Real-IP
+		--publish 8080:8080/tcp \
+		--publish 8081:8081/tcp \
+		--publish 9100:9100/tcp \
+		--publish 8081:8081/udp \
+		--volume ${PWD}/test:/test \
+		${DOCKER_URL}:${VERSION} \
+		-geoip2-city /test/GeoIP2-City-Test.mmdb \
+		-geoip2-asn /test/GeoLite2-ASN-Test.mmdb \
+		-trusted-header X-Real-PortReal-IP \
+		-tls-bind :8081 \
+		-tls-crt /test/server.pem \
+		-tls-key /test/server.key \
+		-enable-http3 \
+		-metrics-bind :9100

README.md

@@ -6,29 +6,33 @@
 [![GitHub release](https://img.shields.io/github/release/dcarrillo/whatismyip.svg)](https://github.com/dcarrillo/whatismyip/releases/)
 [![License Apache 2.0](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](./LICENSE)
 
-- [What is my IP address](#what-is-my-ip-address)
-  - [Features](#features)
-  - [Endpoints](#endpoints)
-  - [DNS discovery](#dns-discovery)
-  - [Build](#build)
-  - [Usage](#usage)
-  - [Examples](#examples)
-    - [Run a default TCP server](#run-a-default-tcp-server)
-    - [Run a TLS (HTTP/2) and enable What is my DNS](#run-a-tls-http2-and-enable-what-is-my-dns)
-    - [Run an HTTP/3 server](#run-an-http3-server)
-    - [Run a default TCP server with a custom template and trust a pair of custom headers set by an upstream proxy](#run-a-default-tcp-server-with-a-custom-template-and-trust-a-pair-of-custom-headers-set-by-an-upstream-proxy)
-  - [Download](#download)
-  - [Docker](#docker)
-    - [Run a container locally using test databases](#run-a-container-locally-using-test-databases)
-    - [From Docker Hub](#from-docker-hub)
+- [Features](#features)
+- [Endpoints](#endpoints)
+- [DNS discovery](#dns-discovery)
+- [Build](#build)
+- [Usage](#usage)
+- [Examples](#examples)
+  - [Run a default TCP server](#run-a-default-tcp-server)
+  - [Run a default TCP server with geo information enabled](#run-a-default-tcp-server-with-geo-information-enabled)
+  - [Run a TLS (HTTP/2) and enable "what is my DNS" with geo information](#run-a-tls-http2-and-enable-what-is-my-dns-with-geo-information)
+  - [Run an HTTP/3 server](#run-an-http3-server)
+  - [Run a default TCP server with a custom template and trust a pair of custom headers set by an upstream proxy](#run-a-default-tcp-server-with-a-custom-template-and-trust-a-pair-of-custom-headers-set-by-an-upstream-proxy)
+- [Download](#download)
+- [Docker](#docker)
+  - [Run a container locally using test databases](#run-a-container-locally-using-test-databases)
+  - [From Docker Hub](#from-docker-hub)
 
-> [!NOTE]  
-> Since version 2.3.0, the application includes an optional client [DNS discovery](#dns-discovery)
+> [!NOTE]
+> Since version 3.2.0, an optional prometheus metrics endpoint is available.
+>
+> Since version 3.0.0, the geodb database is not mandatory; not adding the flags will disable the geo feature.
+>
+> Since version 2.3.0, the application includes an optional client [DNS discovery](#dns-discovery) feature.
 
-Just another "what is my IP address" service, including geolocation, TCP open port checking, and headers information. Written in go with high performance in mind,
-it uses [gin](https://github.com/gin-gonic/gin) which uses [httprouter](https://github.com/julienschmidt/httprouter) a lightweight high performance HTTP multiplexer.
+Just another "what is my IP address" service, including geolocation, TCP open port checking, and headers information. Written in Go with high performance in mind,
+it uses [gin](https://github.com/gin-gonic/gin) which uses [httprouter](https://github.com/julienschmidt/httprouter), a lightweight high-performance HTTP multiplexer.
 
-Take a look at [ifconfig.es](https://ifconfig.es) a live site using `whatismyip` and the `DNS discovery` enabled.
+Take a look at [ifconfig.es](https://ifconfig.es), a live site using `whatismyip` with the `DNS discovery` feature enabled.
 
 Get your public IP easily from the command line:
 
@@ -51,12 +55,13 @@ curl -L dns.ifconfig.es
 
 - TLS and HTTP/2.
 - Experimental HTTP/3 support. HTTP/3 requires a TLS server running (`-tls-bind`), as HTTP/3 starts as a TLS connection that then gets upgraded to UDP. The UDP port is the same as the one used for the TLS server.
-- Beta DNS discovery: A best-effort approach to discovering the DNS server that is resolving the client's requests.
+- DNS discovery: A best-effort approach to discovering the DNS server that is resolving the client's requests.
 - Can run behind a proxy by trusting a custom header (usually `X-Real-IP`) to figure out the source IP address. It also supports a custom header to resolve the client port, if the proxy can only add a header for the IP (for example a fixed header from CDNs) the client port is shown as unknown.
 - IPv4 and IPv6.
 - Geolocation info including ASN. This feature is possible thanks to [maxmind](https://dev.maxmind.com/geoip/geolite2-free-geolocation-data?lang=en) GeoLite2 databases. In order to use these databases, a license key is needed. Please visit Maxmind site for further instructions and get a free license.
 - Checking TCP open ports.
 - High performance.
+- Prometheus metrics endpoint: Exports metrics (on a separete process/port) for HTTP requests, request duration, geo lookups, port scans, and DNS queries.
 - Self-contained server that can reload GeoLite2 databases and/or SSL certificates without stop/start. The `hup` signal is honored.
 - HTML templates for the landing page.
 - Text plain and JSON output.
@@ -85,7 +90,7 @@ curl -L dns.ifconfig.es
 
 ## DNS discovery
 
-The DNS discovery works by forcing the client to make a request to `<uuid>.dns.ifconfig.es` this DNS request is handled by a microdns server
+The DNS discovery works by forcing the client to make a request to `<uuid>.dns.ifconfig.es`. This DNS request is handled by a microdns server
 included in the `whatismyip` binary. In order to run the discovery server, a configuration file in the following form has to be created:
 
 ```yaml
@@ -115,7 +120,7 @@ curl $(cat /proc/sys/kernel/random/uuid).dns.ifconfig.es
 
 ## Build
 
-Golang >= 1.22 is required.
+Golang >= 1.25 is required.
 
 `make build`
 
@@ -124,42 +129,52 @@ Golang >= 1.22 is required.
 ```text
 Usage of whatismyip:
   -bind string
-        Listening address (see https://pkg.go.dev/net?#Listen) (default ":8080")
+    Listening address (see https://pkg.go.dev/net?#Listen) (default ":8080")
+  -disable-scan
+    Disable TCP port scanning functionality
   -enable-http3
-        Enable HTTP/3 protocol. HTTP/3 requires --tls-bind set, as HTTP/3 starts as a TLS connection that then gets upgraded to UDP. The UDP port is the same as the one used for the TLS server.
+    Enable HTTP/3 protocol. HTTP/3 requires --tls-bind set, as HTTP/3 starts as a TLS connection that then gets upgraded to UDP. The UDP port is the same as the one used for the TLS server.
   -enable-secure-headers
-        Add sane security-related headers to every response
+    Add sane security-related headers to every response
   -geoip2-asn string
-        Path to GeoIP2 ASN database
+    Path to GeoIP2 ASN database. Enables ASN information. (--geoip2-city becomes mandatory)
   -geoip2-city string
-        Path to GeoIP2 city database
+    Path to GeoIP2 city database. Enables geo information (--geoip2-asn becomes mandatory)
+  -metrics-bind string
+    Listening address for Prometheus metrics endpoint (see https://pkg.go.dev/net?#Listen). It enables the metrics available at the given address/port via the /metrics endpoint.
   -resolver string
-        Path to the resolver configuration. It actually enables the resolver for DNS client discovery.
+    Path to the resolver configuration. It actually enables the resolver for DNS client discovery.
   -template string
-        Path to template file
+    Path to the template file
   -tls-bind string
-        Listening address for TLS (see https://pkg.go.dev/net?#Listen)
+    Listening address for TLS (see https://pkg.go.dev/net?#Listen)
   -tls-crt string
-        When using TLS, path to certificate file
+    When using TLS, path to certificate file
   -tls-key string
-        When using TLS, path to private key file
+    When using TLS, path to private key file
   -trusted-header string
-        Trusted request header for remote IP (e.g. X-Real-IP). When using this feature if -trusted-port-header is not set the client port is shown as 'unknown'
+    Trusted request header for remote IP (e.g. X-Real-IP). When using this feature if -trusted-port-header is not set the client port is shown as 'unknown'
   -trusted-port-header string
-        Trusted request header for remote client port (e.g. X-Real-Port). When this parameter is set -trusted-header becomes mandatory
+    Trusted request header for remote client port (e.g. X-Real-Port). When this parameter is set -trusted-header becomes mandatory
   -version
-        Output version information and exit
+    Output version information and exit
 ```
 
 ## Examples
 
 ### Run a default TCP server
 
+```bash
+./whatismyip
+```
+
+### Run a default TCP server with geo information enabled
+
 ```bash
 ./whatismyip -geoip2-city ./test/GeoIP2-City-Test.mmdb -geoip2-asn ./test/GeoLite2-ASN-Test.mmdb
 ```
 
-### Run a TLS (HTTP/2) and enable What is my DNS
+### Run a TLS (HTTP/2) and enable "what is my DNS" with geo information
 
 ```bash
 ./whatismyip -geoip2-city ./test/GeoIP2-City-Test.mmdb -geoip2-asn ./test/GeoLite2-ASN-Test.mmdb \
@@ -187,7 +202,7 @@ Download the latest version from [github](https://github.com/dcarrillo/whatismyi
 
 ## Docker
 
-An ultra-light (~4MB) image is available on [docker hub](https://hub.docker.com/r/dcarrillo/whatismyip). Since version `2.1.2`, the binary is compressed using [upx](https://github.com/upx/upx).
+An ultra-light (~6MB) image is available on [docker hub](https://hub.docker.com/r/dcarrillo/whatismyip). ~Since version `2.1.2`, the binary is compressed using [upx](https://github.com/upx/upx).~
 
 ### Run a container locally using test databases
 

cmd/whatismyip.go

@@ -2,62 +2,96 @@ package main
 
 import (
 	"context"
+	"errors"
 	"flag"
 	"fmt"
+	"log"
 	"net/http"
 	"os"
 	"slices"
 	"time"
 
 	"github.com/dcarrillo/whatismyip/internal/httputils"
+	"github.com/dcarrillo/whatismyip/internal/metrics"
 	"github.com/dcarrillo/whatismyip/internal/setting"
 	"github.com/dcarrillo/whatismyip/resolver"
+	"github.com/dcarrillo/whatismyip/router"
 	"github.com/dcarrillo/whatismyip/server"
+	"github.com/dcarrillo/whatismyip/service"
 	"github.com/gin-contrib/secure"
 	"github.com/patrickmn/go-cache"
 
-	"github.com/dcarrillo/whatismyip/router"
 	"github.com/gin-gonic/gin"
 )
 
 func main() {
-	o, err := setting.Setup(os.Args[1:])
-	if err == flag.ErrHelp || err == setting.ErrVersion {
-		fmt.Print(o)
-		os.Exit(0)
-	} else if err != nil {
-		fmt.Println(err)
+	cfg, o, err := setting.Setup(os.Args[1:])
+	if err != nil {
+		if errors.Is(err, flag.ErrHelp) || errors.Is(err, setting.ErrVersion) {
+			fmt.Print(o)
+			os.Exit(0)
+		}
+		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}
 
-	servers := []server.Server{}
-	engine := setupEngine()
-
-	if setting.App.Resolver.Domain != "" {
-		store := cache.New(1*time.Minute, 10*time.Minute)
-		dnsEngine := resolver.Setup(store)
-		nameServer := server.NewDNSServer(context.Background(), dnsEngine.Handler())
-		servers = append(servers, nameServer)
-		engine.Use(router.GetDNSDiscoveryHandler(store, setting.App.Resolver.Domain, setting.App.Resolver.RedirectPort))
+	var geoSvc *service.Geo
+	if cfg.GeodbPath.City != "" || cfg.GeodbPath.ASN != "" {
+		if geoSvc, err = service.NewGeo(context.Background(), cfg.GeodbPath.City, cfg.GeodbPath.ASN); err != nil {
+			log.Fatalf("Failed to load geo databases: %s", err)
+		}
 	}
 
-	router.SetupTemplate(engine)
-	router.Setup(engine)
-	servers = slices.Concat(servers, setupHTTPServers(context.Background(), engine.Handler()))
+	servers := []server.Server{}
+	engine := setupEngine(cfg)
 
-	whatismyip := server.Setup(servers)
+	if cfg.Resolver.Domain != "" {
+		store := cache.New(1*time.Minute, 10*time.Minute)
+		var dnsEngine *resolver.Resolver
+		if dnsEngine, err = resolver.Setup(store, resolver.Settings{
+			Domain:          cfg.Resolver.Domain,
+			ResourceRecords: cfg.Resolver.ResourceRecords,
+			RedirectPort:    cfg.Resolver.RedirectPort,
+			IPv4:            cfg.Resolver.Ipv4,
+			IPv6:            cfg.Resolver.Ipv6,
+		}); err != nil {
+			log.Fatalf("Invalid resolver configuration: %s", err)
+		}
+		nameServer := server.NewDNSServer(context.Background(), dnsEngine.Handler())
+		servers = append(servers, nameServer)
+		engine.Use(router.GetDNSDiscoveryHandler(store, geoSvc, cfg.Resolver.Domain, cfg.Resolver.RedirectPort))
+	}
+
+	rt := router.NewRouter(geoSvc, cfg.TrustedHeader, cfg.TrustedPortHeader, cfg.TemplatePath, cfg.DisableTCPScan)
+	router.SetupTemplate(engine, cfg.TemplatePath)
+	router.Setup(engine, rt)
+	servers = slices.Concat(servers, setupHTTPServers(context.Background(), engine.Handler(), cfg))
+
+	if cfg.PrometheusAddress != "" {
+		prometheusServer := server.NewPrometheusServer(context.Background(), cfg.PrometheusAddress,
+			server.Timeouts{
+				ReadTimeout:  cfg.Server.ReadTimeout,
+				WriteTimeout: cfg.Server.WriteTimeout,
+			})
+		servers = append(servers, prometheusServer)
+	}
+
+	whatismyip := server.Setup(servers, geoSvc)
 	whatismyip.Run()
 }
 
-func setupEngine() *gin.Engine {
+func setupEngine(cfg setting.Settings) *gin.Engine {
 	gin.DisableConsoleColor()
 	if os.Getenv(gin.EnvGinMode) == "" {
 		gin.SetMode(gin.ReleaseMode)
 	}
 	engine := gin.New()
-	engine.Use(gin.LoggerWithFormatter(httputils.GetLogFormatter))
-	engine.Use(gin.Recovery())
-	if setting.App.EnableSecureHeaders {
+	engine.Use(gin.LoggerWithFormatter(httputils.GetLogFormatter), gin.Recovery())
+	if cfg.PrometheusAddress != "" {
+		metrics.Enable()
+		engine.Use(metrics.GinMiddleware())
+	}
+	if cfg.EnableSecureHeaders {
 		engine.Use(secure.New(secure.Config{
 			BrowserXssFilter:   true,
 			ContentTypeNosniff: true,
@@ -65,24 +99,28 @@ func setupEngine() *gin.Engine {
 		}))
 	}
 	_ = engine.SetTrustedProxies(nil)
-	engine.TrustedPlatform = setting.App.TrustedHeader
+	engine.TrustedPlatform = cfg.TrustedHeader
 
 	return engine
 }
 
-func setupHTTPServers(ctx context.Context, handler http.Handler) []server.Server {
+func setupHTTPServers(ctx context.Context, handler http.Handler, cfg setting.Settings) []server.Server {
 	var servers []server.Server
+	timeouts := server.Timeouts{
+		ReadTimeout:  cfg.Server.ReadTimeout,
+		WriteTimeout: cfg.Server.WriteTimeout,
+	}
 
-	if setting.App.BindAddress != "" {
-		tcpServer := server.NewTCPServer(ctx, &handler)
+	if cfg.BindAddress != "" {
+		tcpServer := server.NewTCPServer(ctx, handler, cfg.BindAddress, timeouts)
 		servers = append(servers, tcpServer)
 	}
 
-	if setting.App.TLSAddress != "" {
-		tlsServer := server.NewTLSServer(ctx, &handler)
+	if cfg.TLSAddress != "" {
+		tlsServer := server.NewTLSServer(ctx, handler, cfg.TLSAddress, cfg.TLSCrtPath, cfg.TLSKeyPath, timeouts)
 		servers = append(servers, tlsServer)
-		if setting.App.EnableHTTP3 {
-			quicServer := server.NewQuicServer(ctx, tlsServer)
+		if cfg.EnableHTTP3 {
+			quicServer := server.NewQuicServer(ctx, tlsServer, cfg.TLSAddress, cfg.TLSCrtPath, cfg.TLSKeyPath)
 			servers = append(servers, quicServer)
 		}
 	}

go.mod

@@ -1,112 +1,60 @@
 module github.com/dcarrillo/whatismyip
 
-go 1.22
+go 1.25.0
 
 require (
-	github.com/docker/docker v26.1.3+incompatible
-	github.com/gin-contrib/secure v1.1.0
-	github.com/gin-gonic/gin v1.10.0
+	github.com/gin-contrib/secure v1.1.3
+	github.com/gin-gonic/gin v1.12.0
 	github.com/google/uuid v1.6.0
-	github.com/miekg/dns v1.1.59
-	github.com/oschwald/maxminddb-golang v1.12.0
+	github.com/miekg/dns v1.1.72
+	github.com/oschwald/maxminddb-golang v1.13.1
 	github.com/patrickmn/go-cache v2.1.0+incompatible
-	github.com/quic-go/quic-go v0.44.0
-	github.com/stretchr/testify v1.9.0
-	github.com/testcontainers/testcontainers-go v0.31.0
+	github.com/prometheus/client_golang v1.23.2
+	github.com/quic-go/quic-go v0.60.0
+	github.com/stretchr/testify v1.11.1
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
-	dario.cat/mergo v1.0.0 // indirect
-	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
-	github.com/BurntSushi/toml v1.4.0 // indirect
-	github.com/Microsoft/go-winio v0.6.1 // indirect
-	github.com/Microsoft/hcsshim v0.11.4 // indirect
-	github.com/bytedance/sonic v1.11.8 // indirect
-	github.com/bytedance/sonic/loader v0.1.1 // indirect
-	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
-	github.com/chavacava/garif v0.1.0 // indirect
-	github.com/cloudwego/base64x v0.1.4 // indirect
-	github.com/cloudwego/iasm v0.2.0 // indirect
-	github.com/containerd/containerd v1.7.15 // indirect
-	github.com/containerd/log v0.1.0 // indirect
-	github.com/cpuguy83/dockercfg v0.3.1 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bytedance/gopkg v0.1.4 // indirect
+	github.com/bytedance/sonic v1.15.2 // indirect
+	github.com/bytedance/sonic/loader v0.5.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cloudwego/base64x v0.1.7 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/distribution/reference v0.5.0 // indirect
-	github.com/docker/go-connections v0.5.0 // indirect
-	github.com/docker/go-units v0.5.0 // indirect
-	github.com/fatih/color v1.17.0 // indirect
-	github.com/fatih/structtag v1.2.0 // indirect
-	github.com/felixge/httpsnoop v1.0.4 // indirect
-	github.com/gabriel-vasile/mimetype v1.4.4 // indirect
-	github.com/gin-contrib/sse v0.1.0 // indirect
-	github.com/go-logr/logr v1.4.1 // indirect
-	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.13 // indirect
+	github.com/gin-contrib/sse v1.1.1 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-playground/validator/v10 v10.21.0 // indirect
-	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
-	github.com/goccy/go-json v0.10.3 // indirect
-	github.com/gogo/protobuf v1.3.2 // indirect
-	github.com/golang/protobuf v1.5.4 // indirect
-	github.com/google/pprof v0.0.0-20240528025155-186aa0362fba // indirect
+	github.com/go-playground/validator/v10 v10.30.3 // indirect
+	github.com/goccy/go-json v0.10.6 // indirect
+	github.com/goccy/go-yaml v1.19.2 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.16.0 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
-	github.com/kr/text v0.2.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.4.0 // indirect
+	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
-	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
-	github.com/magiconair/properties v1.8.7 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/mattn/go-runewidth v0.0.15 // indirect
-	github.com/mgechev/dots v0.0.0-20210922191527-e955255bf517 // indirect
-	github.com/mgechev/revive v1.3.7 // indirect
-	github.com/mitchellh/go-homedir v1.1.0 // indirect
-	github.com/moby/docker-image-spec v1.3.1 // indirect
-	github.com/moby/patternmatcher v0.6.0 // indirect
-	github.com/moby/sys/sequential v0.5.0 // indirect
-	github.com/moby/sys/user v0.1.0 // indirect
-	github.com/moby/term v0.5.0 // indirect
+	github.com/mattn/go-isatty v0.0.23 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
-	github.com/morikuni/aec v1.0.0 // indirect
-	github.com/olekukonko/tablewriter v0.0.5 // indirect
-	github.com/onsi/ginkgo/v2 v2.19.0 // indirect
-	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/opencontainers/image-spec v1.1.0 // indirect
-	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pelletier/go-toml/v2 v2.4.3 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
-	github.com/quic-go/qpack v0.4.0 // indirect
-	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/shirou/gopsutil/v3 v3.23.12 // indirect
-	github.com/shoenig/go-m1cpu v0.1.6 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
-	github.com/spf13/afero v1.11.0 // indirect
-	github.com/tklauser/go-sysconf v0.3.12 // indirect
-	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.70.0 // indirect
+	github.com/prometheus/procfs v0.21.1 // indirect
+	github.com/quic-go/qpack v0.6.0 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
-	github.com/ugorji/go/codec v1.2.12 // indirect
-	github.com/yusufpapurcu/wmi v1.2.3 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
-	go.opentelemetry.io/otel v1.24.0 // indirect
-	go.opentelemetry.io/otel/metric v1.24.0 // indirect
-	go.opentelemetry.io/otel/trace v1.24.0 // indirect
-	go.uber.org/mock v0.4.0 // indirect
-	golang.org/x/arch v0.8.0 // indirect
-	golang.org/x/crypto v0.23.0 // indirect
-	golang.org/x/exp v0.0.0-20240531132922-fd00a4e0eefc // indirect
-	golang.org/x/mod v0.17.0 // indirect
-	golang.org/x/net v0.25.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/sys v0.20.0 // indirect
-	golang.org/x/text v0.15.0 // indirect
-	golang.org/x/tools v0.21.0 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20231106174013-bbf56f31fb17 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20231120223509-83a465c0220f // indirect
-	google.golang.org/grpc v1.59.0 // indirect
-	google.golang.org/protobuf v1.34.1 // indirect
+	github.com/ugorji/go/codec v1.3.1 // indirect
+	go.mongodb.org/mongo-driver/v2 v2.8.0 // indirect
+	golang.org/x/arch v0.29.0 // indirect
+	golang.org/x/crypto v0.54.0 // indirect
+	golang.org/x/mod v0.38.0 // indirect
+	golang.org/x/net v0.57.0 // indirect
+	golang.org/x/sync v0.22.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
+	golang.org/x/text v0.40.0 // indirect
+	golang.org/x/tools v0.48.0 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 )

go.sum

@@ -1,306 +1,136 @@
-dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
-dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
-github.com/AdaLogics/go-fuzz-headers v0.0.0-20230811130428-ced1acdcaa24 h1:bvDV9vkmnHYOMsOr4WLk+Vo07yKIzd94sVoIqshQ4bU=
-github.com/AdaLogics/go-fuzz-headers v0.0.0-20230811130428-ced1acdcaa24/go.mod h1:8o94RPi1/7XTJvwPpRSzSUedZrtlirdB3r9Z20bi2f8=
-github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8=
-github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
-github.com/BurntSushi/toml v1.4.0 h1:kuoIxZQy2WRRk1pttg9asf+WVv6tWQuBNVmK8+nqPr0=
-github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
-github.com/Microsoft/go-winio v0.6.1 h1:9/kr64B9VUZrLm5YYwbGtUJnMgqWVOdUAXu6Migciow=
-github.com/Microsoft/go-winio v0.6.1/go.mod h1:LRdKpFKfdobln8UmuiYcKPot9D2v6svN5+sAH+4kjUM=
-github.com/Microsoft/hcsshim v0.11.4 h1:68vKo2VN8DE9AdN4tnkWnmdhqdbpUFM8OF3Airm7fz8=
-github.com/Microsoft/hcsshim v0.11.4/go.mod h1:smjE4dvqPX9Zldna+t5FG3rnoHhaB7QYxPRqGcpAD9w=
-github.com/bytedance/sonic v1.11.8 h1:Zw/j1KfiS+OYTi9lyB3bb0CFxPJVkM17k1wyDG32LRA=
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 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gotest.tools/v3 v3.5.0 h1:Ljk6PdHdOhAb5aDMWXjDLMMhph+BpztA4v1QdqEW2eY=
-gotest.tools/v3 v3.5.0/go.mod h1:isy3WKz7GK6uNw/sbHzfKBLvlvXwUyV06n6brMxxopU=
-nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
-rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

integration-tests/go.mod

@@ -0,0 +1,102 @@
+module github.com/dcarrillo/whatismyip/integration-tests
+
+go 1.25.0
+
+replace github.com/dcarrillo/whatismyip => ..
+
+require (
+	github.com/dcarrillo/whatismyip v0.0.0-00010101000000-000000000000
+	github.com/docker/docker v28.0.4+incompatible
+	github.com/quic-go/quic-go v0.60.0
+	github.com/stretchr/testify v1.11.1
+	github.com/testcontainers/testcontainers-go v0.36.0
+)
+
+require (
+	dario.cat/mergo v1.0.1 // indirect
+	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bytedance/gopkg v0.1.4 // indirect
+	github.com/bytedance/sonic v1.15.2 // indirect
+	github.com/bytedance/sonic/loader v0.5.1 // indirect
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cloudwego/base64x v0.1.7 // indirect
+	github.com/containerd/log v0.1.0 // indirect
+	github.com/containerd/platforms v0.2.1 // indirect
+	github.com/cpuguy83/dockercfg v0.3.2 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/distribution/reference v0.6.0 // indirect
+	github.com/docker/go-connections v0.5.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/ebitengine/purego v0.8.2 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.13 // indirect
+	github.com/gin-contrib/sse v1.1.1 // indirect
+	github.com/gin-gonic/gin v1.12.0 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.30.3 // indirect
+	github.com/goccy/go-json v0.10.6 // indirect
+	github.com/goccy/go-yaml v1.19.2 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.4.0 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
+	github.com/magiconair/properties v1.8.9 // indirect
+	github.com/mattn/go-isatty v0.0.23 // indirect
+	github.com/moby/docker-image-spec v1.3.1 // indirect
+	github.com/moby/patternmatcher v0.6.0 // indirect
+	github.com/moby/sys/sequential v0.5.0 // indirect
+	github.com/moby/sys/user v0.1.0 // indirect
+	github.com/moby/sys/userns v0.1.0 // indirect
+	github.com/moby/term v0.5.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.1 // indirect
+	github.com/oschwald/maxminddb-golang v1.13.1 // indirect
+	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
+	github.com/pelletier/go-toml/v2 v2.4.3 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/prometheus/client_golang v1.23.2 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.70.0 // indirect
+	github.com/prometheus/procfs v0.21.1 // indirect
+	github.com/quic-go/qpack v0.6.0 // indirect
+	github.com/shirou/gopsutil/v4 v4.25.1 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.3.1 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
+	go.mongodb.org/mongo-driver/v2 v2.8.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
+	go.opentelemetry.io/otel v1.44.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.44.0 // indirect
+	go.opentelemetry.io/otel/metric v1.44.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.44.0 // indirect
+	go.opentelemetry.io/otel/trace v1.44.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.10.0 // indirect
+	golang.org/x/arch v0.29.0 // indirect
+	golang.org/x/crypto v0.54.0 // indirect
+	golang.org/x/net v0.57.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
+	golang.org/x/text v0.40.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260715232425-e75dac1f907d // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

integration-tests/go.sum

@@ -0,0 +1,273 @@
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+golang.org/x/text v0.40.0/go.mod h1:hpnzDAfGV753zIKo+wk3u1bVKCGPbrnF7+7LBF/UHVY=
+golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 h1:vVKdlvoWBphwdxWKrFZEuM0kGgGLxUOYcY4U/2Vjg44=
+golang.org/x/time v0.0.0-20220210224613-90d013bbcef8/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57 h1:JLQynH/LBHfCTSbDWl+py8C+Rg/k1OVH3xfcaiANuF0=
+google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57/go.mod h1:kSJwQxqmFXeo79zOmbrALdflXQeAYcUbgS7PbpMknCY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260715232425-e75dac1f907d h1:Jkpk39hlTZOIp3RbfvNX9R8Hv+Sw0X89nlU/xFOErsc=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260715232425-e75dac1f907d/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/grpc v1.79.2 h1:fRMD94s2tITpyJGtBBn7MkMseNpOZU8ZxgC3MMBaXRU=
+google.golang.org/grpc v1.79.2/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhHLrHQ=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gotest.tools/v3 v3.5.1 h1:EENdUnS3pdur5nybKYIh2Vfgc8IUNBjxDPSjtiJcOzU=
+gotest.tools/v3 v3.5.1/go.mod h1:isy3WKz7GK6uNw/sbHzfKBLvlvXwUyV06n6brMxxopU=

integration-tests/integration_test.go

@@ -10,7 +10,6 @@ import (
 	"net/http"
 	"strings"
 	"testing"
-	"time"
 
 	validator "github.com/dcarrillo/whatismyip/internal/validator/uuid"
 	"github.com/dcarrillo/whatismyip/router"
@@ -99,6 +98,7 @@ func TestContainerIntegration(t *testing.T) {
 				"8000:8000",
 				"8001:8001",
 				"8001:8001/udp",
+				"9100:9100",
 				"53531:53/udp",
 			},
 			Cmd: []string{
@@ -111,6 +111,7 @@ func TestContainerIntegration(t *testing.T) {
 				"-trusted-header", "X-Real-IP",
 				"-enable-secure-headers",
 				"-enable-http3",
+				"-metrics-bind", ":9100",
 				"-resolver", "/resolver.yml",
 			},
 			Files: []tc.ContainerFile{
@@ -135,18 +136,17 @@ func TestContainerIntegration(t *testing.T) {
 					ContainerFilePath: "/resolver.yml",
 				},
 			},
-			WaitingFor: wait.ForAll(
-				wait.ForListeningPort("8000/tcp").WithStartupTimeout(5*time.Second),
-				wait.ForListeningPort("8001/tcp").WithStartupTimeout(5*time.Second),
-				wait.ForListeningPort("8001/udp").WithStartupTimeout(5*time.Second),
-				wait.ForListeningPort("53/udp").WithStartupTimeout(5*time.Second),
-			),
+			WaitingFor: wait.ForLog("Starting QUIC server"),
 			AutoRemove: true,
 		},
 		Started: true,
 	})
 	require.NoError(t, err)
-	t.Cleanup(func() { c.Terminate(ctx) })
+	t.Cleanup(func() {
+		if err := c.Terminate(ctx); err != nil {
+			t.Logf("Failed to terminate container: %s", err)
+		}
+	})
 
 	http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
 	tests := []struct {
@@ -200,8 +200,10 @@ func TestContainerIntegration(t *testing.T) {
 				resp, body, err = doQuicRequest(req)
 			} else {
 				client := &http.Client{}
-				resp, _ = client.Do(req)
+				resp, err = client.Do(req)
+				assert.NoError(t, err)
 				body, err = io.ReadAll(resp.Body)
+				assert.NoError(t, err)
 				if strings.Contains(tt.url, "https://") {
 					assert.Equal(t, `h3=":8001"; ma=2592000`, resp.Header.Get("Alt-Svc"))
 				}
@@ -236,11 +238,98 @@ func TestContainerIntegration(t *testing.T) {
 		})
 	}
 
+	t.Run("RequestMetricsEndpoint", func(t *testing.T) {
+		req, err := http.NewRequest("GET", "http://localhost:9100/metrics", nil)
+		assert.NoError(t, err)
+
+		client := &http.Client{}
+		resp, err := client.Do(req)
+		assert.NoError(t, err)
+		assert.Equal(t, http.StatusOK, resp.StatusCode)
+
+		body, err := io.ReadAll(resp.Body)
+		assert.NoError(t, err)
+		bodyStr := string(body)
+
+		assert.Contains(t, bodyStr, "whatismyip_http_requests_total")
+		assert.Contains(t, bodyStr, "whatismyip_http_request_duration_seconds")
+		assert.Contains(t, bodyStr, "# HELP")
+		assert.Contains(t, bodyStr, "# TYPE")
+	})
+
 	testWhatIsMyDNS(t)
 }
 
+// TODO If other flags like this one are implemented we should think of a better approach
+func TestContainerIntegrationDisableScan(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skiping integration tests")
+	}
+
+	ctx := context.Background()
+	c, err := tc.GenericContainer(ctx, tc.GenericContainerRequest{
+		ContainerRequest: tc.ContainerRequest{
+			FromDockerfile: tc.FromDockerfile{
+				Context:       "../",
+				Dockerfile:    "./test/Dockerfile",
+				PrintBuildLog: true,
+				KeepImage:     false,
+				BuildOptionsModifier: func(buildOptions *types.ImageBuildOptions) {
+					buildOptions.Target = "test"
+				},
+			},
+			ExposedPorts: []string{
+				"8000:8000",
+			},
+			Cmd: []string{
+				"-geoip2-city", "/GeoIP2-City-Test.mmdb",
+				"-geoip2-asn", "/GeoLite2-ASN-Test.mmdb",
+				"-bind", ":8000",
+				"-trusted-header", "X-Real-IP",
+				"-enable-secure-headers",
+				"-disable-scan",
+			},
+			Files: []tc.ContainerFile{
+				{
+					HostFilePath:      "./../test/GeoIP2-City-Test.mmdb",
+					ContainerFilePath: "/GeoIP2-City-Test.mmdb",
+				},
+				{
+					HostFilePath:      "./../test/GeoLite2-ASN-Test.mmdb",
+					ContainerFilePath: "/GeoLite2-ASN-Test.mmdb",
+				},
+			},
+			WaitingFor: wait.ForLog("Starting TCP server"),
+			AutoRemove: true,
+		},
+		Started: true,
+	})
+	require.NoError(t, err)
+	t.Cleanup(func() {
+		if err := c.Terminate(ctx); err != nil {
+			t.Logf("Failed to terminate container: %s", err)
+		}
+	})
+
+	t.Run("RequestScanEndpointWithDisabledScan", func(t *testing.T) {
+		req, err := http.NewRequest("GET", "http://localhost:8000/scan/tcp/8000", nil)
+		assert.NoError(t, err)
+		req.Header.Set("Accept", "application/json")
+		req.Header.Set("X-Real-IP", "127.0.0.1")
+
+		client := &http.Client{}
+		resp, err := client.Do(req)
+		assert.NoError(t, err)
+		assert.Equal(t, http.StatusNotFound, resp.StatusCode)
+
+		body, err := io.ReadAll(resp.Body)
+		assert.NoError(t, err)
+		assert.NotEmpty(t, body)
+	})
+}
+
 func doQuicRequest(req *http.Request) (*http.Response, []byte, error) {
-	roundTripper := &http3.RoundTripper{
+	roundTripper := &http3.Transport{
 		TLSClientConfig: &tls.Config{
 			InsecureSkipVerify: true,
 		},

internal/httputils/http.go

@@ -7,38 +7,32 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/dcarrillo/whatismyip/internal/setting"
 	"github.com/gin-gonic/gin"
 )
 
-// HeadersToSortedString shorts and dumps http.Header to a string separated by \n
+// HeadersToSortedString sorts and dumps http.Header to a string separated by \n
 func HeadersToSortedString(headers http.Header) string {
-	var output string
-
 	keys := make([]string, 0, len(headers))
 	for k := range headers {
 		keys = append(keys, k)
 	}
 	sort.Strings(keys)
 
+	var output strings.Builder
 	for _, k := range keys {
-		if len(headers[k]) > 1 {
-			for _, h := range headers[k] {
-				output += k + ": " + h + "\n"
-			}
-		} else {
-			output += k + ": " + headers[k][0] + "\n"
+		for _, h := range headers[k] {
+			output.WriteString(k + ": " + h + "\n")
 		}
 	}
 
-	return output
+	return output.String()
 }
 
-// GetHeadersWithoutTrustedHeaders return a http.Heade object with the original headers except trusted headers
-func GetHeadersWithoutTrustedHeaders(ctx *gin.Context) http.Header {
-	h := ctx.Request.Header
+// GetHeadersWithoutTrustedHeaders returns a copy of the request headers with the trusted headers removed
+func GetHeadersWithoutTrustedHeaders(ctx *gin.Context, trustedHeader, trustedPortHeader string) http.Header {
+	h := ctx.Request.Header.Clone()
 
-	for _, k := range []string{setting.App.TrustedHeader, setting.App.TrustedPortHeader} {
+	for _, k := range []string{trustedHeader, trustedPortHeader} {
 		delete(h, textproto.CanonicalMIMEHeaderKey(k))
 	}
 
@@ -49,7 +43,7 @@ func GetHeadersWithoutTrustedHeaders(ctx *gin.Context) http.Header {
 func GetLogFormatter(param gin.LogFormatterParams) string {
 	return fmt.Sprintf("%s - [%s] \"%s %s %s\" %d %d %d %s \"%s\" \"%s\" \"%s\"\n",
 		param.ClientIP,
-		param.TimeStamp.Format("02/Nov/2006:15:04:05 -0700"),
+		param.TimeStamp.Format("02/Jan/2006:15:04:05 -0700"),
 		param.Method,
 		param.Path,
 		param.Request.Proto,

internal/httputils/http_test.go

@@ -25,7 +25,7 @@ Header3: Three
 }
 
 func TestGetLogFormatter(t *testing.T) {
-	expected := "127.0.0.1 - [01/Nov/0001:00:00:00 +0000] \"GET / HTTP/1.1\" 200 100 1000 local \"golang test 1.0\" \"1.1.1.1, 2.2.2.2\" \"-\"\n"
+	expected := "127.0.0.1 - [15/Jul/2022:10:30:00 +0000] \"GET / HTTP/1.1\" 200 100 1000 local \"golang test 1.0\" \"1.1.1.1, 2.2.2.2\" \"-\"\n"
 
 	h := http.Header{}
 	h.Set("User-Agent", "golang test 1.0")
@@ -39,7 +39,7 @@ func TestGetLogFormatter(t *testing.T) {
 
 	p := gin.LogFormatterParams{
 		ClientIP:     "127.0.0.1",
-		TimeStamp:    time.Time{},
+		TimeStamp:    time.Date(2022, time.July, 15, 10, 30, 0, 0, time.UTC),
 		Method:       "GET",
 		Path:         "/",
 		StatusCode:   200,

internal/metrics/metrics.go

@@ -0,0 +1,122 @@
+package metrics
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var (
+	enabled          bool
+	initOnce         sync.Once
+	requestsTotal    *prometheus.CounterVec
+	requestDuration  *prometheus.HistogramVec
+	requestsInFlight prometheus.Gauge
+	geoLookups       *prometheus.CounterVec
+	portScans        prometheus.Counter
+	dnsQueries       *prometheus.CounterVec
+)
+
+func Enable() {
+	initOnce.Do(func() {
+		enabled = true
+
+		requestsTotal = promauto.NewCounterVec(
+			prometheus.CounterOpts{
+				Name: "whatismyip_http_requests_total",
+				Help: "Total number of HTTP requests",
+			},
+			[]string{"method", "path", "status"},
+		)
+
+		requestDuration = promauto.NewHistogramVec(
+			prometheus.HistogramOpts{
+				Name:    "whatismyip_http_request_duration_seconds",
+				Help:    "HTTP request latency in seconds",
+				Buckets: prometheus.DefBuckets,
+			},
+			[]string{"method", "path"},
+		)
+
+		requestsInFlight = promauto.NewGauge(
+			prometheus.GaugeOpts{
+				Name: "whatismyip_http_requests_in_flight",
+				Help: "Current number of HTTP requests being processed",
+			},
+		)
+
+		geoLookups = promauto.NewCounterVec(
+			prometheus.CounterOpts{
+				Name: "whatismyip_geo_lookups_total",
+				Help: "Total number of geo lookups",
+			},
+			[]string{"type"},
+		)
+
+		portScans = promauto.NewCounter(
+			prometheus.CounterOpts{
+				Name: "whatismyip_port_scans_total",
+				Help: "Total number of port scan requests",
+			},
+		)
+
+		dnsQueries = promauto.NewCounterVec(
+			prometheus.CounterOpts{
+				Name: "whatismyip_dns_queries_total",
+				Help: "Total number of DNS queries",
+			},
+			[]string{"query_type", "rcode"},
+		)
+	})
+}
+
+func GinMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if !enabled {
+			c.Next()
+			return
+		}
+
+		start := time.Now()
+		path := c.FullPath()
+		if path == "" {
+			path = "/404" // group 404s
+		}
+
+		requestsInFlight.Inc()
+		defer requestsInFlight.Dec()
+
+		c.Next()
+
+		duration := time.Since(start).Seconds()
+		status := c.Writer.Status()
+
+		requestsTotal.WithLabelValues(c.Request.Method, path, fmt.Sprintf("%dxx", status/100)).Inc()
+		requestDuration.WithLabelValues(c.Request.Method, path).Observe(duration)
+	}
+}
+
+func RecordGeoLookup(lookupType string) {
+	if !enabled {
+		return
+	}
+	geoLookups.WithLabelValues(lookupType).Inc()
+}
+
+func RecordPortScan() {
+	if !enabled {
+		return
+	}
+	portScans.Inc()
+}
+
+func RecordDNSQuery(queryType string, rcode string) {
+	if !enabled {
+		return
+	}
+	dnsQueries.WithLabelValues(queryType, rcode).Inc()
+}

internal/metrics/metrics_test.go

@@ -0,0 +1,200 @@
+package metrics
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/prometheus/client_golang/prometheus/testutil"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDisabledMetrics_Middleware(t *testing.T) {
+	if enabled {
+		t.Skip("Skipping disabled test - metrics already enabled")
+	}
+
+	gin.SetMode(gin.TestMode)
+	w := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(w)
+
+	c.Request = httptest.NewRequest("GET", "/test", nil)
+
+	middleware := GinMiddleware()
+
+	assert.NotPanics(t, func() {
+		middleware(c)
+	})
+}
+
+func TestDisabledMetrics_GeoLookup(t *testing.T) {
+	if enabled {
+		t.Skip("Skipping disabled test - metrics already enabled")
+	}
+
+	assert.NotPanics(t, func() {
+		RecordGeoLookup("city")
+	})
+}
+
+func TestDisabledMetrics_PortScan(t *testing.T) {
+	if enabled {
+		t.Skip("Skipping disabled test - metrics already enabled")
+	}
+
+	assert.NotPanics(t, func() {
+		RecordPortScan()
+	})
+}
+
+func TestDisabledMetrics_DNSQuery(t *testing.T) {
+	if enabled {
+		t.Skip("Skipping disabled test - metrics already enabled")
+	}
+
+	assert.NotPanics(t, func() {
+		RecordDNSQuery("A", "NOERROR")
+	})
+}
+
+func TestEnable(t *testing.T) {
+	Enable()
+
+	assert.True(t, enabled, "Enable() should set enabled to true")
+	assert.NotNil(t, requestsTotal, "requestsTotal should be initialized")
+	assert.NotNil(t, requestDuration, "requestDuration should be initialized")
+	assert.NotNil(t, requestsInFlight, "requestsInFlight should be initialized")
+	assert.NotNil(t, geoLookups, "geoLookups should be initialized")
+	assert.NotNil(t, portScans, "portScans should be initialized")
+	assert.NotNil(t, dnsQueries, "dnsQueries should be initialized")
+}
+
+func TestEnableIdempotent(t *testing.T) {
+	Enable()
+	firstRequestsTotal := requestsTotal
+
+	Enable()
+	Enable()
+
+	assert.Equal(t, firstRequestsTotal, requestsTotal, "Enable() should be idempotent")
+}
+
+func TestGinMiddleware_StatusCategories(t *testing.T) {
+	Enable()
+
+	testCases := []struct {
+		status   int
+		category string
+	}{
+		{200, "2xx"},
+		{201, "2xx"},
+		{301, "3xx"},
+		{404, "4xx"},
+		{500, "5xx"},
+	}
+
+	for _, tc := range testCases {
+		gin.SetMode(gin.TestMode)
+		router := gin.New()
+		router.Use(GinMiddleware())
+		router.GET("/test-status", func(c *gin.Context) {
+			c.Status(tc.status)
+		})
+
+		initialCount := testutil.ToFloat64(requestsTotal.WithLabelValues("GET", "/test-status", tc.category))
+
+		w := httptest.NewRecorder()
+		req := httptest.NewRequest("GET", "/test-status", nil)
+		router.ServeHTTP(w, req)
+
+		count := testutil.ToFloat64(requestsTotal.WithLabelValues("GET", "/test-status", tc.category))
+		assert.Equal(t, initialCount+1, count, "Expected count for category %s to increase by 1", tc.category)
+	}
+}
+
+func TestGinMiddleware_404(t *testing.T) {
+	Enable()
+
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	router.Use(GinMiddleware())
+
+	initialCount := testutil.ToFloat64(requestsTotal.WithLabelValues("GET", "/404", "4xx"))
+
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest("GET", "/nonexistent-path", nil)
+	router.ServeHTTP(w, req)
+
+	count := testutil.ToFloat64(requestsTotal.WithLabelValues("GET", "/404", "4xx"))
+	assert.Equal(t, initialCount+1, count, "Expected count to increase by 1 for empty path (404)")
+}
+
+func TestGinMiddleware_RecordsDuration(t *testing.T) {
+	Enable()
+
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	router.Use(GinMiddleware())
+	router.GET("/test-duration", func(c *gin.Context) {
+		c.Status(http.StatusOK)
+	})
+
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest("GET", "/test-duration", nil)
+	router.ServeHTTP(w, req)
+
+	metric := requestDuration.WithLabelValues("GET", "/test-duration")
+	assert.NotNil(t, metric, "Expected histogram metric to exist")
+}
+
+func TestRecordGeoLookup(t *testing.T) {
+	Enable()
+
+	initialCityCount := testutil.ToFloat64(geoLookups.WithLabelValues("city"))
+	initialCountryCount := testutil.ToFloat64(geoLookups.WithLabelValues("asn"))
+
+	RecordGeoLookup("city")
+	RecordGeoLookup("city")
+	RecordGeoLookup("asn")
+
+	cityCount := testutil.ToFloat64(geoLookups.WithLabelValues("city"))
+	assert.Equal(t, initialCityCount+2, cityCount, "Expected city lookups to increase by 2")
+
+	countryCount := testutil.ToFloat64(geoLookups.WithLabelValues("asn"))
+	assert.Equal(t, initialCountryCount+1, countryCount, "Expected country lookups to increase by 1")
+}
+
+func TestRecordPortScan(t *testing.T) {
+	Enable()
+
+	initialCount := testutil.ToFloat64(portScans)
+
+	RecordPortScan()
+	RecordPortScan()
+
+	count := testutil.ToFloat64(portScans)
+	assert.Equal(t, initialCount+2, count, "Expected port scans to increase by 2")
+}
+
+func TestRecordDNSQuery(t *testing.T) {
+	Enable()
+
+	initialACount := testutil.ToFloat64(dnsQueries.WithLabelValues("A", "NOERROR"))
+	initialAAAACount := testutil.ToFloat64(dnsQueries.WithLabelValues("AAAA", "NOERROR"))
+	initialNXDOMAINCount := testutil.ToFloat64(dnsQueries.WithLabelValues("A", "NXDOMAIN"))
+
+	RecordDNSQuery("A", "NOERROR")
+	RecordDNSQuery("A", "NOERROR")
+	RecordDNSQuery("AAAA", "NOERROR")
+	RecordDNSQuery("A", "NXDOMAIN")
+
+	aCount := testutil.ToFloat64(dnsQueries.WithLabelValues("A", "NOERROR"))
+	assert.Equal(t, initialACount+2, aCount, "Expected A NOERROR queries to increase by 2")
+
+	aaaaCount := testutil.ToFloat64(dnsQueries.WithLabelValues("AAAA", "NOERROR"))
+	assert.Equal(t, initialAAAACount+1, aaaaCount, "Expected AAAA NOERROR queries to increase by 1")
+
+	nxdomainCount := testutil.ToFloat64(dnsQueries.WithLabelValues("A", "NXDOMAIN"))
+	assert.Equal(t, initialNXDOMAINCount+1, nxdomainCount, "Expected A NXDOMAIN queries to increase by 1")
+}

internal/setting/app.go

@@ -12,7 +12,7 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
-type geodbPath struct {
+type geodbConf struct {
 	City string
 	ASN  string
 }
@@ -29,17 +29,19 @@ type resolver struct {
 	Ipv6            []string `yaml:"ipv6,omitempty"`
 }
 
-type settings struct {
-	GeodbPath           geodbPath
+type Settings struct {
+	GeodbPath           geodbConf
 	TemplatePath        string
 	BindAddress         string
 	TLSAddress          string
 	TLSCrtPath          string
 	TLSKeyPath          string
+	PrometheusAddress   string
 	TrustedHeader       string
 	TrustedPortHeader   string
 	EnableSecureHeaders bool
 	EnableHTTP3         bool
+	DisableTCPScan      bool
 	Server              serverSettings
 	Resolver            resolver
 	version             bool
@@ -49,112 +51,121 @@ const defaultAddress = ":8080"
 
 var ErrVersion = errors.New("setting: version requested")
 
-var App = settings{
-	// hard-coded for the time being
-	Server: serverSettings{
-		ReadTimeout:  10 * time.Second,
-		WriteTimeout: 10 * time.Second,
-	},
-}
-
-func Setup(args []string) (output string, err error) {
+func Setup(args []string) (cfg Settings, output string, err error) {
 	flags := flag.NewFlagSet("whatismyip", flag.ContinueOnError)
 	var buf bytes.Buffer
 	var resolverConf string
 	flags.SetOutput(&buf)
 
-	flags.StringVar(&App.GeodbPath.City, "geoip2-city", "", "Path to GeoIP2 city database")
-	flags.StringVar(&App.GeodbPath.ASN, "geoip2-asn", "", "Path to GeoIP2 ASN database")
-	flags.StringVar(&App.TemplatePath, "template", "", "Path to the template file")
+	cfg.Server = serverSettings{
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+
+	flags.StringVar(&cfg.GeodbPath.City, "geoip2-city", "", "Path to GeoIP2 city database. Enables geo information (--geoip2-asn becomes mandatory)")
+	flags.StringVar(&cfg.GeodbPath.ASN, "geoip2-asn", "", "Path to GeoIP2 ASN database. Enables ASN information. (--geoip2-city becomes mandatory)")
+	flags.StringVar(&cfg.TemplatePath, "template", "", "Path to the template file")
 	flags.StringVar(
 		&resolverConf,
 		"resolver",
 		"",
 		"Path to the resolver configuration. It actually enables the resolver for DNS client discovery.")
 	flags.StringVar(
-		&App.BindAddress,
+		&cfg.BindAddress,
 		"bind",
 		defaultAddress,
 		"Listening address (see https://pkg.go.dev/net?#Listen)",
 	)
 	flags.StringVar(
-		&App.TLSAddress,
+		&cfg.TLSAddress,
 		"tls-bind",
 		"",
 		"Listening address for TLS (see https://pkg.go.dev/net?#Listen)",
 	)
-	flags.StringVar(&App.TLSCrtPath, "tls-crt", "", "When using TLS, path to certificate file")
-	flags.StringVar(&App.TLSKeyPath, "tls-key", "", "When using TLS, path to private key file")
+	flags.StringVar(&cfg.TLSCrtPath, "tls-crt", "", "When using TLS, path to certificate file")
+	flags.StringVar(&cfg.TLSKeyPath, "tls-key", "", "When using TLS, path to private key file")
 	flags.StringVar(
-		&App.TrustedHeader,
+		&cfg.PrometheusAddress,
+		"metrics-bind",
+		"",
+		"Listening address for Prometheus metrics endpoint (see https://pkg.go.dev/net?#Listen). It enables the metrics available at the given address/port via the /metrics endpoint.",
+	)
+	flags.StringVar(
+		&cfg.TrustedHeader,
 		"trusted-header",
 		"",
 		"Trusted request header for remote IP (e.g. X-Real-IP). When using this feature if -trusted-port-header is not set the client port is shown as 'unknown'",
 	)
 	flags.StringVar(
-		&App.TrustedPortHeader,
+		&cfg.TrustedPortHeader,
 		"trusted-port-header",
 		"",
 		"Trusted request header for remote client port (e.g. X-Real-Port). When this parameter is set -trusted-header becomes mandatory",
 	)
-	flags.BoolVar(&App.version, "version", false, "Output version information and exit")
+	flags.BoolVar(&cfg.version, "version", false, "Output version information and exit")
 	flags.BoolVar(
-		&App.EnableSecureHeaders,
+		&cfg.EnableSecureHeaders,
 		"enable-secure-headers",
 		false,
 		"Add sane security-related headers to every response",
 	)
 	flags.BoolVar(
-		&App.EnableHTTP3,
+		&cfg.EnableHTTP3,
 		"enable-http3",
 		false,
 		"Enable HTTP/3 protocol. HTTP/3 requires --tls-bind set, as HTTP/3 starts as a TLS connection that then gets upgraded to UDP. The UDP port is the same as the one used for the TLS server.",
 	)
+	flags.BoolVar(
+		&cfg.DisableTCPScan,
+		"disable-scan",
+		false,
+		"Disable TCP port scanning functionality",
+	)
 
 	err = flags.Parse(args)
 	if err != nil {
-		return buf.String(), err
+		return cfg, buf.String(), err
 	}
 
-	if App.version {
-		return fmt.Sprintf("whatismyip version %s", core.Version), ErrVersion
+	if cfg.version {
+		return cfg, fmt.Sprintf("whatismyip version %s", core.Version), ErrVersion
 	}
 
-	if App.TrustedPortHeader != "" && App.TrustedHeader == "" {
-		return "", fmt.Errorf("truster-header is mandatory when truster-port-header is set")
+	if (cfg.GeodbPath.City != "" && cfg.GeodbPath.ASN == "") || (cfg.GeodbPath.City == "" && cfg.GeodbPath.ASN != "") {
+		return cfg, "", errors.New("both --geoip2-city and --geoip2-asn are mandatory to enable geo information")
 	}
 
-	if App.GeodbPath.City == "" || App.GeodbPath.ASN == "" {
-		return "", fmt.Errorf("geoip2-city and geoip2-asn parameters are mandatory")
+	if cfg.TrustedPortHeader != "" && cfg.TrustedHeader == "" {
+		return cfg, "", errors.New("trusted-header is mandatory when trusted-port-header is set")
 	}
 
-	if (App.TLSAddress != "") && (App.TLSCrtPath == "" || App.TLSKeyPath == "") {
-		return "", fmt.Errorf("in order to use TLS, the -tls-crt and -tls-key flags are mandatory")
+	if (cfg.TLSAddress != "") && (cfg.TLSCrtPath == "" || cfg.TLSKeyPath == "") {
+		return cfg, "", errors.New("in order to use TLS, the -tls-crt and -tls-key flags are mandatory")
 	}
 
-	if App.EnableHTTP3 && App.TLSAddress == "" {
-		return "", fmt.Errorf("in order to use HTTP3, the -tls-bind is mandatory")
+	if cfg.EnableHTTP3 && cfg.TLSAddress == "" {
+		return cfg, "", errors.New("in order to use HTTP3, the -tls-bind is mandatory")
 	}
 
-	if App.TemplatePath != "" {
-		info, err := os.Stat(App.TemplatePath)
-		if os.IsNotExist(err) {
-			return "", fmt.Errorf("%s no such file or directory", App.TemplatePath)
+	if cfg.TemplatePath != "" {
+		info, err := os.Stat(cfg.TemplatePath)
+		if err != nil {
+			return cfg, "", fmt.Errorf("template path: %w", err)
 		}
 		if info.IsDir() {
-			return "", fmt.Errorf("%s must be a file", App.TemplatePath)
+			return cfg, "", fmt.Errorf("%s must be a file", cfg.TemplatePath)
 		}
 	}
 
 	if resolverConf != "" {
 		var err error
-		App.Resolver, err = readYAML(resolverConf)
+		cfg.Resolver, err = readYAML(resolverConf)
 		if err != nil {
-			return "", fmt.Errorf("error reading resolver configuration %s", err)
+			return cfg, "", fmt.Errorf("reading resolver configuration: %w", err)
 		}
 	}
 
-	return buf.String(), nil
+	return cfg, buf.String(), nil
 }
 
 func readYAML(path string) (resolver resolver, err error) {

internal/setting/app_test.go

@@ -12,69 +12,64 @@ import (
 )
 
 func TestParseMandatoryFlags(t *testing.T) {
-	var mandatoryFlags = []struct {
+	mandatoryFlags := []struct {
 		args []string
 	}{
-		{
-			[]string{},
-		},
-		{
-			[]string{"-geoip2-city", "/city-path"},
-		},
-		{
-			[]string{"-geoip2-asn", "/asn-path"},
-		},
 		{
 			[]string{
-				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-tls-bind", ":9000",
+				"-geoip2-city", "my-city-path",
 			},
 		},
 		{
 			[]string{
-				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-tls-bind", ":9000",
-				"-tls-crt", "/crt-path",
+				"-geoip2-asn", "my-asn-path",
+			},
+		},
+
+		{
+			[]string{
+				"-tls-bind", ":9000",
 			},
 		},
 		{
 			[]string{
-				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-tls-bind", ":9000",
-				"-tls-key", "/key-path",
+				"-tls-bind", ":9000", "-tls-crt", "/crt-path",
 			},
 		},
 		{
 			[]string{
-				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-enable-http3",
+				"-tls-bind", ":9000", "-tls-key", "/key-path",
 			},
 		},
 		{
 			[]string{
-				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-bind", ":8000",
-				"-trusted-port-header", "port-header",
+				"-enable-http3",
+			},
+		},
+		{
+			[]string{
+				"-bind", ":8000", "-trusted-port-header", "port-header",
 			},
 		},
 	}
 
 	for _, tt := range mandatoryFlags {
 		t.Run(strings.Join(tt.args, " "), func(t *testing.T) {
-			_, err := Setup(tt.args)
-			require.NotNil(t, err)
+			_, _, err := Setup(tt.args)
+			require.Error(t, err)
 			assert.Contains(t, err.Error(), "mandatory")
 		})
 	}
 }
 
 func TestParseFlags(t *testing.T) {
-	var flags = []struct {
+	flags := []struct {
 		args []string
-		conf settings
+		conf Settings
 	}{
 		{
-			[]string{"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path"},
-			settings{
-				GeodbPath: geodbPath{
-					City: "/city-path",
-					ASN:  "/asn-path",
-				},
+			[]string{},
+			Settings{
 				BindAddress: ":8080",
 				Server: serverSettings{
 					ReadTimeout:  10 * time.Second,
@@ -82,10 +77,21 @@ func TestParseFlags(t *testing.T) {
 				},
 			},
 		},
+		{
+			[]string{"-disable-scan"},
+			Settings{
+				BindAddress: ":8080",
+				Server: serverSettings{
+					ReadTimeout:  10 * time.Second,
+					WriteTimeout: 10 * time.Second,
+				},
+				DisableTCPScan: true,
+			},
+		},
 		{
 			[]string{"-bind", ":8001", "-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path"},
-			settings{
-				GeodbPath: geodbPath{
+			Settings{
+				GeodbPath: geodbConf{
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
@@ -101,8 +107,8 @@ func TestParseFlags(t *testing.T) {
 				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path", "-tls-bind", ":9000",
 				"-tls-crt", "/crt-path", "-tls-key", "/key-path",
 			},
-			settings{
-				GeodbPath: geodbPath{
+			Settings{
+				GeodbPath: geodbConf{
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
@@ -121,8 +127,8 @@ func TestParseFlags(t *testing.T) {
 				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path",
 				"-trusted-header", "header", "-trusted-port-header", "port-header",
 			},
-			settings{
-				GeodbPath: geodbPath{
+			Settings{
+				GeodbPath: geodbConf{
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
@@ -140,8 +146,8 @@ func TestParseFlags(t *testing.T) {
 				"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path",
 				"-trusted-header", "header", "-enable-secure-headers",
 			},
-			settings{
-				GeodbPath: geodbPath{
+			Settings{
+				GeodbPath: geodbConf{
 					City: "/city-path",
 					ASN:  "/asn-path",
 				},
@@ -158,19 +164,19 @@ func TestParseFlags(t *testing.T) {
 
 	for _, tt := range flags {
 		t.Run(strings.Join(tt.args, " "), func(t *testing.T) {
-			_, err := Setup(tt.args)
+			cfg, _, err := Setup(tt.args)
 			require.Nil(t, err)
-			assert.True(t, reflect.DeepEqual(App, tt.conf))
+			assert.True(t, reflect.DeepEqual(cfg, tt.conf))
 		})
 	}
 }
 
 func TestParseFlagsUsage(t *testing.T) {
-	var usageArgs = []string{"-help", "-h", "--help"}
+	usageArgs := []string{"-help", "-h", "--help"}
 
 	for _, arg := range usageArgs {
 		t.Run(arg, func(t *testing.T) {
-			output, err := Setup([]string{arg})
+			_, output, err := Setup([]string{arg})
 			assert.ErrorIs(t, err, flag.ErrHelp)
 			assert.Contains(t, output, "Usage of")
 		})
@@ -178,25 +184,34 @@ func TestParseFlagsUsage(t *testing.T) {
 }
 
 func TestParseFlagVersion(t *testing.T) {
-	output, err := Setup([]string{"-version"})
+	_, output, err := Setup([]string{"-version"})
 	assert.ErrorIs(t, err, ErrVersion)
 	assert.Contains(t, output, "whatismyip version")
 }
 
 func TestParseFlagTemplate(t *testing.T) {
-	flags := []string{
-		"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path",
-		"-template", "/template-path",
+	testCases := []struct {
+		name   string
+		flags  []string
+		errMsg string
+	}{
+		{
+			name:   "Invalid template path",
+			flags:  []string{"-template", "/template-path"},
+			errMsg: "no such file or directory",
+		},
+		{
+			name:   "Template path is a directory",
+			flags:  []string{"-template", "/"},
+			errMsg: "must be a file",
+		},
 	}
-	_, err := Setup(flags)
-	assert.Error(t, err)
-	assert.Contains(t, err.Error(), "no such file or directory")
 
-	flags = []string{
-		"-geoip2-city", "/city-path", "-geoip2-asn", "/asn-path",
-		"-template", "/",
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			_, _, err := Setup(tc.flags)
+			require.Error(t, err)
+			assert.Contains(t, err.Error(), tc.errMsg)
+		})
 	}
-	_, err = Setup(flags)
-	require.Error(t, err)
-	assert.Contains(t, err.Error(), "must be a file")
 }

models/geo.go

@@ -1,13 +1,14 @@
 package models
 
 import (
+	"errors"
+	"fmt"
 	"log"
 	"net"
 
 	"github.com/oschwald/maxminddb-golang"
 )
 
-// GeoRecord is the model for City database
 type GeoRecord struct {
 	Country struct {
 		ISOCode string            `maxminddb:"iso_code"`
@@ -26,52 +27,108 @@ type GeoRecord struct {
 	} `maxminddb:"postal"`
 }
 
-// ASNRecord is the model for ASN database
 type ASNRecord struct {
 	AutonomousSystemNumber       uint   `maxminddb:"autonomous_system_number"`
 	AutonomousSystemOrganization string `maxminddb:"autonomous_system_organization"`
 }
 
-type geodb struct {
-	city *maxminddb.Reader
-	asn  *maxminddb.Reader
+type GeoDB struct {
+	cityPath string
+	asnPath  string
+	City     *maxminddb.Reader
+	ASN      *maxminddb.Reader
 }
 
-var db geodb
+func Setup(cityPath string, asnPath string) (*GeoDB, error) {
+	city, asn, err := openDatabases(cityPath, asnPath)
+	if err != nil {
+		return nil, err
+	}
 
-func openMMDB(path string) *maxminddb.Reader {
+	return &GeoDB{
+		cityPath: cityPath,
+		asnPath:  asnPath,
+		City:     city,
+		ASN:      asn,
+	}, nil
+}
+
+func (db *GeoDB) CloseDBs() error {
+	return closeReaders(db.City, db.ASN)
+}
+
+func (db *GeoDB) Reload() error {
+	city, asn, err := openDatabases(db.cityPath, db.asnPath)
+	if err != nil {
+		return fmt.Errorf("opening new databases: %w", err)
+	}
+
+	oldCity, oldASN := db.City, db.ASN
+	db.City, db.ASN = city, asn
+
+	if err := closeReaders(oldCity, oldASN); err != nil {
+		return fmt.Errorf("closing previous databases: %w", err)
+	}
+	return nil
+}
+
+func closeReaders(city *maxminddb.Reader, asn *maxminddb.Reader) error {
+	var errs []error
+
+	if city != nil {
+		if err := city.Close(); err != nil {
+			errs = append(errs, fmt.Errorf("closing city db: %w", err))
+		}
+	}
+
+	if asn != nil {
+		if err := asn.Close(); err != nil {
+			errs = append(errs, fmt.Errorf("closing ASN db: %w", err))
+		}
+	}
+
+	return errors.Join(errs...)
+}
+
+func (db *GeoDB) LookupCity(ip net.IP) (*GeoRecord, error) {
+	record := &GeoRecord{}
+	err := db.City.Lookup(ip, record)
+	if err != nil {
+		return nil, err
+	}
+
+	return record, nil
+}
+
+func (db *GeoDB) LookupASN(ip net.IP) (*ASNRecord, error) {
+	record := &ASNRecord{}
+	err := db.ASN.Lookup(ip, record)
+	if err != nil {
+		return nil, err
+	}
+	return record, nil
+}
+
+func openDatabases(cityPath, asnPath string) (*maxminddb.Reader, *maxminddb.Reader, error) {
+	city, err := openMMDB(cityPath)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	asn, err := openMMDB(asnPath)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return city, asn, nil
+}
+
+func openMMDB(path string) (*maxminddb.Reader, error) {
 	db, err := maxminddb.Open(path)
 	if err != nil {
-		log.Fatal(err)
+		return nil, err
 	}
 	log.Printf("Database %s has been loaded\n", path)
 
-	return db
-}
-
-// Setup opens all Geolite2 databases
-func Setup(cityPath string, asnPath string) {
-	db.city = openMMDB(cityPath)
-	db.asn = openMMDB(asnPath)
-}
-
-// CloseDBs unmaps from memory and frees resources to the filesystem
-func CloseDBs() {
-	log.Printf("Closing dbs...")
-	if err := db.city.Close(); err != nil {
-		log.Printf("Error closing city db: %s", err)
-	}
-	if err := db.asn.Close(); err != nil {
-		log.Printf("Error closing ASN db: %s", err)
-	}
-}
-
-// LookUp an IP and get city data
-func (record *GeoRecord) LookUp(ip net.IP) error {
-	return db.city.Lookup(ip, record)
-}
-
-// LookUp an IP and get ASN data
-func (record *ASNRecord) LookUp(ip net.IP) error {
-	return db.asn.Lookup(ip, record)
+	return db, nil
 }

models/geo_test.go

@@ -1,10 +1,12 @@
 package models
 
 import (
+	"fmt"
 	"net"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestModels(t *testing.T) {
@@ -59,19 +61,21 @@ func TestModels(t *testing.T) {
 		AutonomousSystemOrganization: "IP-Only",
 	}
 
-	Setup("../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
-	defer CloseDBs()
+	db, err := Setup("../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
+	require.NoError(t, err, fmt.Sprintf("Error setting up db: %s", err))
+	t.Cleanup(func() { assert.NoError(t, db.CloseDBs()) })
+	assert.NotNil(t, db.ASN)
+	assert.NotNil(t, db.City)
 
-	assert.NotNil(t, db.asn)
-	assert.NotNil(t, db.city)
-
-	cityRecord := &GeoRecord{}
-	assert.Nil(t, cityRecord.LookUp(net.ParseIP("81.2.69.192")))
+	cityRecord, err := db.LookupCity(net.ParseIP("81.2.69.192"))
+	require.NoError(t, err, fmt.Sprintf("Error looking up city: %s", err))
 	assert.Equal(t, expectedCity, cityRecord)
-	assert.Error(t, cityRecord.LookUp(net.ParseIP("error")))
+	_, err = db.LookupCity(net.ParseIP("error"))
+	assert.Error(t, err)
 
-	asnRecord := &ASNRecord{}
-	assert.Nil(t, asnRecord.LookUp(net.ParseIP("82.99.17.64")))
+	asnRecord, err := db.LookupASN(net.ParseIP("82.99.17.64"))
+	require.NoError(t, err, fmt.Sprintf("Error looking up asn: %s", err))
 	assert.Equal(t, expectedASN, asnRecord)
-	assert.Error(t, asnRecord.LookUp(net.ParseIP("error")))
+	_, err = db.LookupASN(net.ParseIP("error"))
+	assert.Error(t, err)
 }

resolver/setup.go

@@ -1,21 +1,30 @@
 package resolver
 
 import (
+	"fmt"
 	"log"
 	"net"
 	"strings"
 
-	"github.com/dcarrillo/whatismyip/internal/setting"
+	"github.com/dcarrillo/whatismyip/internal/metrics"
 	"github.com/dcarrillo/whatismyip/internal/validator/uuid"
 	"github.com/miekg/dns"
 	"github.com/patrickmn/go-cache"
 )
 
+type Settings struct {
+	Domain          string
+	ResourceRecords []string
+	RedirectPort    string
+	IPv4            []string
+	IPv6            []string
+}
+
 type Resolver struct {
 	handler *dns.ServeMux
 	store   *cache.Cache
 	domain  string
-	rr      []string
+	rr      []dns.RR
 	ipv4    []net.IP
 	ipv6    []net.IP
 }
@@ -27,27 +36,51 @@ func ensureDotSuffix(s string) string {
 	return s
 }
 
-func Setup(store *cache.Cache) *Resolver {
-	var ipv4, ipv6 []net.IP
-	for _, ip := range setting.App.Resolver.Ipv4 {
-		ipv4 = append(ipv4, net.ParseIP(ip))
+func Setup(store *cache.Cache, cfg Settings) (*Resolver, error) {
+	domain := ensureDotSuffix(cfg.Domain)
+
+	rr := make([]dns.RR, 0, len(cfg.ResourceRecords))
+	for _, res := range cfg.ResourceRecords {
+		record, err := dns.NewRR(domain + " " + res)
+		if err != nil {
+			return nil, fmt.Errorf("parsing resource record %q: %w", res, err)
+		}
+		rr = append(rr, record)
 	}
-	for _, ip := range setting.App.Resolver.Ipv6 {
-		ipv6 = append(ipv6, net.ParseIP(ip))
+
+	ipv4, err := parseIPs(cfg.IPv4)
+	if err != nil {
+		return nil, fmt.Errorf("parsing ipv4 addresses: %w", err)
+	}
+	ipv6, err := parseIPs(cfg.IPv6)
+	if err != nil {
+		return nil, fmt.Errorf("parsing ipv6 addresses: %w", err)
 	}
 
 	resolver := &Resolver{
 		handler: dns.NewServeMux(),
 		store:   store,
-		domain:  ensureDotSuffix(setting.App.Resolver.Domain),
-		rr:      setting.App.Resolver.ResourceRecords,
+		domain:  domain,
+		rr:      rr,
 		ipv4:    ipv4,
 		ipv6:    ipv6,
 	}
 	resolver.handler.HandleFunc(resolver.domain, resolver.resolve)
 	resolver.handler.HandleFunc(".", resolver.blackHole)
 
-	return resolver
+	return resolver, nil
+}
+
+func parseIPs(addresses []string) ([]net.IP, error) {
+	ips := make([]net.IP, 0, len(addresses))
+	for _, address := range addresses {
+		ip := net.ParseIP(address)
+		if ip == nil {
+			return nil, fmt.Errorf("invalid IP address %q", address)
+		}
+		ips = append(ips, ip)
+	}
+	return ips, nil
 }
 
 func (rsv *Resolver) Handler() *dns.ServeMux {
@@ -57,8 +90,9 @@ func (rsv *Resolver) Handler() *dns.ServeMux {
 func (rsv *Resolver) blackHole(w dns.ResponseWriter, r *dns.Msg) {
 	msg := startReply(r)
 	msg.SetRcode(r, dns.RcodeRefused)
-	w.WriteMsg(msg)
+	writeMsg(w, msg)
 	logger(w, r.Question[0], msg.Rcode)
+	metrics.RecordDNSQuery(dns.TypeToString[r.Question[0].Qtype], dns.RcodeToString[msg.Rcode])
 }
 
 func (rsv *Resolver) resolve(w dns.ResponseWriter, r *dns.Msg) {
@@ -67,17 +101,11 @@ func (rsv *Resolver) resolve(w dns.ResponseWriter, r *dns.Msg) {
 	ip, _, _ := net.SplitHostPort(w.RemoteAddr().String())
 
 	for _, res := range rsv.rr {
-		t := strings.Split(res, " ")[2]
-		if q.Qtype == dns.StringToType[t] {
-			brr, err := buildRR(rsv.domain + " " + res)
-			if err != nil {
-				msg.SetRcode(r, dns.RcodeServerFailure)
-				logger(w, q, msg.Rcode, err.Error())
-			} else {
-				msg.Answer = append(msg.Answer, brr)
-				logger(w, q, msg.Rcode)
-			}
-			w.WriteMsg(msg)
+		if q.Qtype == res.Header().Rrtype {
+			msg.Answer = append(msg.Answer, dns.Copy(res))
+			writeMsg(w, msg)
+			logger(w, q, msg.Rcode)
+			metrics.RecordDNSQuery(dns.TypeToString[q.Qtype], dns.RcodeToString[msg.Rcode])
 			return
 		}
 	}
@@ -87,15 +115,18 @@ func (rsv *Resolver) resolve(w dns.ResponseWriter, r *dns.Msg) {
 	switch {
 	case uuid.IsValid(subDomain):
 		msg.SetRcode(r, rsv.getIP(q, msg))
-		rsv.store.Add(subDomain, ip, cache.DefaultExpiration)
+		// Add fails when the uuid is already registered; keep the first seen
+		// resolver IP for the discovery window
+		_ = rsv.store.Add(subDomain, ip, cache.DefaultExpiration)
 	case lowerName == rsv.domain:
 		msg.SetRcode(r, rsv.getIP(q, msg))
 	default:
 		msg.SetRcode(r, dns.RcodeRefused)
 	}
 
-	w.WriteMsg(msg)
+	writeMsg(w, msg)
 	logger(w, q, msg.Rcode)
+	metrics.RecordDNSQuery(dns.TypeToString[q.Qtype], dns.RcodeToString[msg.Rcode])
 }
 
 func (rsv *Resolver) getIP(question dns.Question, msg *dns.Msg) int {
@@ -122,13 +153,10 @@ func (rsv *Resolver) getIP(question dns.Question, msg *dns.Msg) int {
 	return dns.RcodeRefused
 }
 
-func buildRR(rrs string) (dns.RR, error) {
-	rr, err := dns.NewRR(rrs)
-	if err != nil {
-		return nil, err
+func writeMsg(w dns.ResponseWriter, msg *dns.Msg) {
+	if err := w.WriteMsg(msg); err != nil {
+		log.Printf("Failed to write DNS response: %s", err)
 	}
-
-	return rr, nil
 }
 
 func setHdr(q dns.Question) dns.RR_Header {

router/dns.go

@@ -16,33 +16,45 @@ import (
 type DNSJSONResponse struct {
 	DNS dnsData `json:"dns"`
 }
+type dnsGeoData struct {
+	Country         string `json:"country,omitempty"`
+	AsnOrganization string `json:"provider,omitempty"`
+}
+
 type dnsData struct {
-	IP              string `json:"ip"`
-	Country         string `json:"country"`
-	AsnOrganization string `json:"provider"`
+	IP string `json:"ip"`
+	dnsGeoData
 }
 
 // TODO
 // Implement a proper vhost manager instead of using a middleware
-func GetDNSDiscoveryHandler(store *cache.Cache, domain string, redirectPort string) gin.HandlerFunc {
+func GetDNSDiscoveryHandler(store *cache.Cache, geoSvc *service.Geo, domain string, redirectPort string) gin.HandlerFunc {
 	return func(ctx *gin.Context) {
-		if !strings.HasSuffix(ctx.Request.Host, domain) {
+		host := hostWithoutPort(ctx.Request.Host)
+		if host != domain && !strings.HasSuffix(host, "."+domain) {
 			ctx.Next()
 			return
 		}
 
-		if ctx.Request.Host == domain && ctx.Request.URL.Path == "/" {
+		if host == domain && ctx.Request.URL.Path == "/" {
 			ctx.Redirect(http.StatusFound, fmt.Sprintf("http://%s.%s%s", uuid.New().String(), domain, redirectPort))
 			ctx.Abort()
 			return
 		}
 
-		handleDNS(ctx, store)
+		handleDNS(ctx, store, geoSvc)
 		ctx.Abort()
 	}
 }
 
-func handleDNS(ctx *gin.Context, store *cache.Cache) {
+func hostWithoutPort(host string) string {
+	if h, _, err := net.SplitHostPort(host); err == nil {
+		return h
+	}
+	return host
+}
+
+func handleDNS(ctx *gin.Context, store *cache.Cache, geoSvc *service.Geo) {
 	d := strings.Split(ctx.Request.Host, ".")[0]
 	if !validator.IsValid(d) {
 		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
@@ -67,12 +79,20 @@ func handleDNS(ctx *gin.Context, store *cache.Cache) {
 		return
 	}
 
-	geo := service.Geo{IP: ip}
+	geoResp := dnsGeoData{}
+	if geoSvc != nil {
+		if cityRecord := geoSvc.LookUpCity(ip); cityRecord != nil {
+			geoResp.Country = cityRecord.Country.Names["en"]
+		}
+		if asnRecord := geoSvc.LookUpASN(ip); asnRecord != nil {
+			geoResp.AsnOrganization = asnRecord.AutonomousSystemOrganization
+		}
+	}
+
 	j := DNSJSONResponse{
 		DNS: dnsData{
-			IP:              ipStr,
-			Country:         geo.LookUpCity().Country.Names["en"],
-			AsnOrganization: geo.LookUpASN().AutonomousSystemOrganization,
+			IP:         ipStr,
+			dnsGeoData: geoResp,
 		},
 	}
 

router/dns_test.go

@@ -16,7 +16,7 @@ import (
 
 func TestGetDNSDiscoveryHandler(t *testing.T) {
 	store := cache.New(cache.NoExpiration, cache.NoExpiration)
-	handler := GetDNSDiscoveryHandler(store, domain, "")
+	handler := GetDNSDiscoveryHandler(store, rt.geo, domain, "")
 
 	t.Run("calls next if host does not have domain suffix", func(t *testing.T) {
 		req, _ := http.NewRequest("GET", "/", nil)
@@ -100,13 +100,13 @@ func TestHandleDNS(t *testing.T) {
 			req.Host = tt.subDomain + "." + domain
 
 			if tt.stored != "" {
-				store.Add(tt.subDomain, tt.stored, cache.DefaultExpiration)
+				store.Set(tt.subDomain, tt.stored, cache.DefaultExpiration)
 			}
 
 			w := httptest.NewRecorder()
 			c, _ := gin.CreateTestContext(w)
 			c.Request = req
-			handleDNS(c, store)
+			handleDNS(c, store, rt.geo)
 			assert.Equal(t, http.StatusNotFound, w.Code)
 		})
 	}
@@ -143,8 +143,8 @@ func TestAcceptDNSRequest(t *testing.T) {
 			c, _ := gin.CreateTestContext(w)
 			c.Request = req
 
-			store.Add(u, testIP.ipv4, cache.DefaultExpiration)
-			handleDNS(c, store)
+			store.Set(u, testIP.ipv4, cache.DefaultExpiration)
+			handleDNS(c, store, rt.geo)
 
 			assert.Equal(t, http.StatusOK, w.Code)
 			assert.Equal(t, tt.want, w.Body.String())

router/generic.go

@@ -6,53 +6,55 @@ import (
 	"path/filepath"
 
 	"github.com/dcarrillo/whatismyip/internal/httputils"
-	"github.com/dcarrillo/whatismyip/internal/setting"
-	"github.com/dcarrillo/whatismyip/service"
 	"github.com/gin-gonic/gin"
 )
 
-type JSONResponse struct {
-	IP              string      `json:"ip"`
-	IPVersion       byte        `json:"ip_version"`
-	ClientPort      string      `json:"client_port"`
-	Country         string      `json:"country"`
-	CountryCode     string      `json:"country_code"`
-	City            string      `json:"city"`
-	Latitude        float64     `json:"latitude"`
-	Longitude       float64     `json:"longitude"`
-	PostalCode      string      `json:"postal_code"`
-	TimeZone        string      `json:"time_zone"`
-	ASN             uint        `json:"asn"`
-	ASNOrganization string      `json:"asn_organization"`
-	Host            string      `json:"host"`
-	Headers         http.Header `json:"headers"`
+type GeoResponse struct {
+	Country         string  `json:"country,omitempty"`
+	CountryCode     string  `json:"country_code,omitempty"`
+	City            string  `json:"city,omitempty"`
+	Latitude        float64 `json:"latitude,omitempty"`
+	Longitude       float64 `json:"longitude,omitempty"`
+	PostalCode      string  `json:"postal_code,omitempty"`
+	TimeZone        string  `json:"time_zone,omitempty"`
+	ASN             uint    `json:"asn,omitempty"`
+	ASNOrganization string  `json:"asn_organization,omitempty"`
 }
 
-func getRoot(ctx *gin.Context) {
+type JSONResponse struct {
+	IP         string      `json:"ip"`
+	IPVersion  byte        `json:"ip_version"`
+	ClientPort string      `json:"client_port"`
+	Host       string      `json:"host"`
+	Headers    http.Header `json:"headers"`
+	GeoResponse
+}
+
+func (rt *Router) getRoot(ctx *gin.Context) {
 	switch ctx.NegotiateFormat(gin.MIMEPlain, gin.MIMEHTML, gin.MIMEJSON) {
 	case gin.MIMEHTML:
 		name := "home"
-		if setting.App.TemplatePath != "" {
-			name = filepath.Base(setting.App.TemplatePath)
+		if rt.templatePath != "" {
+			name = filepath.Base(rt.templatePath)
 		}
-		ctx.HTML(http.StatusOK, name, jsonOutput(ctx))
+		ctx.HTML(http.StatusOK, name, rt.jsonOutput(ctx))
 	case gin.MIMEJSON:
-		getJSON(ctx)
+		rt.getJSON(ctx)
 	default:
 		ctx.String(http.StatusOK, ctx.ClientIP()+"\n")
 	}
 }
 
-func getClientPort(ctx *gin.Context) string {
+func (rt *Router) getClientPort(ctx *gin.Context) string {
 	var port string
-	if setting.App.TrustedPortHeader == "" {
-		if setting.App.TrustedHeader != "" {
+	if rt.trustedPortHeader == "" {
+		if rt.trustedHeader != "" {
 			port = "unknown"
 		} else {
 			_, port, _ = net.SplitHostPort(ctx.Request.RemoteAddr)
 		}
 	} else {
-		port = ctx.GetHeader(setting.App.TrustedPortHeader)
+		port = ctx.GetHeader(rt.trustedPortHeader)
 		if port == "" {
 			port = "unknown"
 		}
@@ -61,57 +63,67 @@ func getClientPort(ctx *gin.Context) string {
 	return port
 }
 
-func getClientPortAsString(ctx *gin.Context) {
-	ctx.String(http.StatusOK, getClientPort(ctx)+"\n")
+func (rt *Router) getClientPortAsString(ctx *gin.Context) {
+	ctx.String(http.StatusOK, rt.getClientPort(ctx)+"\n")
 }
 
-func getAllAsString(ctx *gin.Context) {
-	output := "IP: " + ctx.ClientIP() + "\n"
-	output += "Client Port: " + getClientPort(ctx) + "\n"
+func (rt *Router) getAllAsString(ctx *gin.Context) {
+	ip := net.ParseIP(ctx.ClientIP())
 
-	r := service.Geo{IP: net.ParseIP(ctx.ClientIP())}
-	if record := r.LookUpCity(); record != nil {
-		output += geoCityRecordToString(record) + "\n"
+	output := "IP: " + ip.String() + "\n"
+	output += "Client Port: " + rt.getClientPort(ctx) + "\n"
+
+	if rt.geo != nil {
+		if cityRecord := rt.geo.LookUpCity(ip); cityRecord != nil {
+			output += geoCityRecordToString(cityRecord) + "\n"
+		}
+		if asnRecord := rt.geo.LookUpASN(ip); asnRecord != nil {
+			output += geoASNRecordToString(asnRecord) + "\n"
+		}
 	}
 
-	if record := r.LookUpASN(); record != nil {
-		output += geoASNRecordToString(record) + "\n"
-	}
-
-	h := httputils.GetHeadersWithoutTrustedHeaders(ctx)
+	h := httputils.GetHeadersWithoutTrustedHeaders(ctx, rt.trustedHeader, rt.trustedPortHeader)
 	h.Set("Host", ctx.Request.Host)
 	output += httputils.HeadersToSortedString(h)
 
 	ctx.String(http.StatusOK, output)
 }
 
-func getJSON(ctx *gin.Context) {
-	ctx.JSON(http.StatusOK, jsonOutput(ctx))
+func (rt *Router) getJSON(ctx *gin.Context) {
+	ctx.JSON(http.StatusOK, rt.jsonOutput(ctx))
 }
 
-func jsonOutput(ctx *gin.Context) JSONResponse {
-	ip := service.Geo{IP: net.ParseIP(ctx.ClientIP())}
-	asnRecord := ip.LookUpASN()
-	cityRecord := ip.LookUpCity()
+func (rt *Router) jsonOutput(ctx *gin.Context) JSONResponse {
+	ip := net.ParseIP(ctx.ClientIP())
+
 	var version byte = 4
-	if p := net.ParseIP(ctx.ClientIP()).To4(); p == nil {
+	if p := ip.To4(); p == nil {
 		version = 6
 	}
 
+	geoResp := GeoResponse{}
+	if rt.geo != nil {
+		if cityRecord := rt.geo.LookUpCity(ip); cityRecord != nil {
+			geoResp.Country = cityRecord.Country.Names["en"]
+			geoResp.CountryCode = cityRecord.Country.ISOCode
+			geoResp.City = cityRecord.City.Names["en"]
+			geoResp.Latitude = cityRecord.Location.Latitude
+			geoResp.Longitude = cityRecord.Location.Longitude
+			geoResp.PostalCode = cityRecord.Postal.Code
+			geoResp.TimeZone = cityRecord.Location.TimeZone
+		}
+		if asnRecord := rt.geo.LookUpASN(ip); asnRecord != nil {
+			geoResp.ASN = asnRecord.AutonomousSystemNumber
+			geoResp.ASNOrganization = asnRecord.AutonomousSystemOrganization
+		}
+	}
+
 	return JSONResponse{
-		IP:              ctx.ClientIP(),
-		IPVersion:       version,
-		ClientPort:      getClientPort(ctx),
-		Country:         cityRecord.Country.Names["en"],
-		CountryCode:     cityRecord.Country.ISOCode,
-		City:            cityRecord.City.Names["en"],
-		Latitude:        cityRecord.Location.Latitude,
-		Longitude:       cityRecord.Location.Longitude,
-		PostalCode:      cityRecord.Postal.Code,
-		TimeZone:        cityRecord.Location.TimeZone,
-		ASN:             asnRecord.AutonomousSystemNumber,
-		ASNOrganization: asnRecord.AutonomousSystemOrganization,
-		Host:            ctx.Request.Host,
-		Headers:         httputils.GetHeadersWithoutTrustedHeaders(ctx),
+		IP:          ip.String(),
+		IPVersion:   version,
+		ClientPort:  rt.getClientPort(ctx),
+		Host:        ctx.Request.Host,
+		Headers:     httputils.GetHeadersWithoutTrustedHeaders(ctx, rt.trustedHeader, rt.trustedPortHeader),
+		GeoResponse: geoResp,
 	}
 }

router/generic_test.go

@@ -1,12 +1,14 @@
 package router
 
 import (
+	"context"
 	"net"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 
-	"github.com/dcarrillo/whatismyip/internal/setting"
+	"github.com/dcarrillo/whatismyip/service"
+	"github.com/gin-gonic/gin"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -99,8 +101,9 @@ func TestHost(t *testing.T) {
 
 func TestClientPort(t *testing.T) {
 	type args struct {
-		params  []string
-		headers map[string][]string
+		trustedHeader     string
+		trustedPortHeader string
+		headers           map[string][]string
 	}
 	tests := []struct {
 		name     string
@@ -114,35 +117,23 @@ func TestClientPort(t *testing.T) {
 		{
 			name: "Trusted header only set",
 			args: args{
-				params: []string{
-					"-geoip2-city", "city",
-					"-geoip2-asn", "asn",
-					"-trusted-header", trustedHeader,
-				},
+				trustedHeader: trustedHeader,
 			},
 			expected: "unknown\n",
 		},
 		{
 			name: "Trusted and port header set but not included in headers",
 			args: args{
-				params: []string{
-					"-geoip2-city", "city",
-					"-geoip2-asn", "asn",
-					"-trusted-header", trustedHeader,
-					"-trusted-port-header", trustedPortHeader,
-				},
+				trustedHeader:     trustedHeader,
+				trustedPortHeader: trustedPortHeader,
 			},
 			expected: "unknown\n",
 		},
 		{
 			name: "Trusted and port header set and included in headers",
 			args: args{
-				params: []string{
-					"-geoip2-city", "city",
-					"-geoip2-asn", "asn",
-					"-trusted-header", trustedHeader,
-					"-trusted-port-header", trustedPortHeader,
-				},
+				trustedHeader:     trustedHeader,
+				trustedPortHeader: trustedPortHeader,
 				headers: map[string][]string{
 					trustedHeader:     {testIP.ipv4},
 					trustedPortHeader: {"1001"},
@@ -153,19 +144,22 @@ func TestClientPort(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		_, _ = setting.Setup(tt.args.params)
 		t.Run(tt.name, func(t *testing.T) {
+			engine := gin.Default()
+			engine.TrustedPlatform = tt.args.trustedHeader
+			r := NewRouter(nil, tt.args.trustedHeader, tt.args.trustedPortHeader, "", false)
+			Setup(engine, r)
+
 			req, _ := http.NewRequest("GET", "/client-port", nil)
 			req.RemoteAddr = net.JoinHostPort(testIP.ipv4, "1000")
 			req.Header = tt.args.headers
 
 			w := httptest.NewRecorder()
-			app.ServeHTTP(w, req)
+			engine.ServeHTTP(w, req)
 
 			assert.Equal(t, 200, w.Code)
 			assert.Equal(t, contentType.text, w.Header().Get("Content-Type"))
 			assert.Equal(t, tt.expected, w.Body.String())
-			t.Log(w.Header())
 		})
 	}
 }
@@ -181,14 +175,11 @@ func TestNotFound(t *testing.T) {
 }
 
 func TestJSON(t *testing.T) {
-	_, _ = setting.Setup(
-		[]string{
-			"-geoip2-city", "city",
-			"-geoip2-asn", "asn",
-			"-trusted-header", trustedHeader,
-			"-trusted-port-header", trustedPortHeader,
-		},
-	)
+	svc, _ := service.NewGeo(context.Background(), "../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
+	engine := gin.Default()
+	engine.TrustedPlatform = trustedHeader
+	r := NewRouter(svc, trustedHeader, trustedPortHeader, "", false)
+	Setup(engine, r)
 
 	type args struct {
 		ip string
@@ -222,7 +213,7 @@ func TestJSON(t *testing.T) {
 			req.Header.Set(trustedPortHeader, "1001")
 
 			w := httptest.NewRecorder()
-			app.ServeHTTP(w, req)
+			engine.ServeHTTP(w, req)
 
 			assert.Equal(t, 200, w.Code)
 			assert.Equal(t, contentType.json, w.Header().Get("Content-Type"))
@@ -248,14 +239,11 @@ ASN Organization:
 Header1: one
 Host: test
 `
-	_, _ = setting.Setup(
-		[]string{
-			"-geoip2-city", "city",
-			"-geoip2-asn", "asn",
-			"-trusted-header", trustedHeader,
-			"-trusted-port-header", trustedPortHeader,
-		},
-	)
+	svc, _ := service.NewGeo(context.Background(), "../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
+	engine := gin.Default()
+	engine.TrustedPlatform = trustedHeader
+	r := NewRouter(svc, trustedHeader, trustedPortHeader, "", false)
+	Setup(engine, r)
 
 	req, _ := http.NewRequest("GET", "/all", nil)
 	req.RemoteAddr = net.JoinHostPort(testIP.ipv4, "1000")
@@ -265,7 +253,7 @@ Host: test
 	req.Header.Set("Header1", "one")
 
 	w := httptest.NewRecorder()
-	app.ServeHTTP(w, req)
+	engine.ServeHTTP(w, req)
 
 	assert.Equal(t, 200, w.Code)
 	assert.Equal(t, contentType.text, w.Header().Get("Content-Type"))

router/geo.go

@@ -8,7 +8,6 @@ import (
 	"strings"
 
 	"github.com/dcarrillo/whatismyip/models"
-	"github.com/dcarrillo/whatismyip/service"
 	"github.com/gin-gonic/gin"
 )
 
@@ -82,32 +81,56 @@ var asnOutput = map[string]asnDataFormatter{
 	},
 }
 
-func getGeoAsString(ctx *gin.Context) {
-	field := strings.ToLower(ctx.Params.ByName("field"))
-	ip := service.Geo{IP: net.ParseIP(ctx.ClientIP())}
-	record := ip.LookUpCity()
+func (rt *Router) getGeoAsString(ctx *gin.Context) {
+	if rt.geo == nil {
+		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		return
+	}
 
+	record := rt.geo.LookUpCity(net.ParseIP(ctx.ClientIP()))
+	if record == nil {
+		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		return
+	}
+
+	field := strings.ToLower(ctx.Params.ByName("field"))
 	if field == "" {
 		ctx.String(http.StatusOK, geoCityRecordToString(record))
-	} else if g, ok := geoOutput[field]; ok {
-		ctx.String(http.StatusOK, g.format(record))
-	} else {
-		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		return
 	}
+
+	g, ok := geoOutput[field]
+	if !ok {
+		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		return
+	}
+	ctx.String(http.StatusOK, g.format(record))
 }
 
-func getASNAsString(ctx *gin.Context) {
-	field := strings.ToLower(ctx.Params.ByName("field"))
-	ip := service.Geo{IP: net.ParseIP(ctx.ClientIP())}
-	record := ip.LookUpASN()
+func (rt *Router) getASNAsString(ctx *gin.Context) {
+	if rt.geo == nil {
+		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		return
+	}
 
+	record := rt.geo.LookUpASN(net.ParseIP(ctx.ClientIP()))
+	if record == nil {
+		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		return
+	}
+
+	field := strings.ToLower(ctx.Params.ByName("field"))
 	if field == "" {
 		ctx.String(http.StatusOK, geoASNRecordToString(record))
-	} else if g, ok := asnOutput[field]; ok {
-		ctx.String(http.StatusOK, g.format(record))
-	} else {
-		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		return
 	}
+
+	g, ok := asnOutput[field]
+	if !ok {
+		ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		return
+	}
+	ctx.String(http.StatusOK, g.format(record))
 }
 
 func geoCityRecordToString(record *models.GeoRecord) string {

router/headers.go

@@ -9,15 +9,14 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-func getHeadersAsSortedString(ctx *gin.Context) {
-	h := httputils.GetHeadersWithoutTrustedHeaders(ctx)
+func (rt *Router) getHeadersAsSortedString(ctx *gin.Context) {
+	h := httputils.GetHeadersWithoutTrustedHeaders(ctx, rt.trustedHeader, rt.trustedPortHeader)
 	h.Set("Host", ctx.Request.Host)
-
 	ctx.String(http.StatusOK, httputils.HeadersToSortedString(h))
 }
 
-func getHeaderAsString(ctx *gin.Context) {
-	headers := httputils.GetHeadersWithoutTrustedHeaders(ctx)
+func (rt *Router) getHeaderAsString(ctx *gin.Context) {
+	headers := httputils.GetHeadersWithoutTrustedHeaders(ctx, rt.trustedHeader, rt.trustedPortHeader)
 
 	h := ctx.Params.ByName("header")
 	if v := headers.Get(ctx.Params.ByName("header")); v != "" {

router/headers_test.go

@@ -1,11 +1,13 @@
 package router
 
 import (
+	"context"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 
-	"github.com/dcarrillo/whatismyip/internal/setting"
+	"github.com/dcarrillo/whatismyip/service"
+	"github.com/gin-gonic/gin"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -27,12 +29,11 @@ Header2: value22
 Header3: value3
 Host: 
 `
-	_, _ = setting.Setup([]string{
-		"-geoip2-city", "city",
-		"-geoip2-asn", "asn",
-		"-trusted-header", trustedHeader,
-		"-trusted-port-header", trustedPortHeader,
-	})
+	svc, _ := service.NewGeo(context.Background(), "../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
+	engine := gin.Default()
+	engine.TrustedPlatform = trustedHeader
+	r := NewRouter(svc, trustedHeader, trustedPortHeader, "", false)
+	Setup(engine, r)
 	req, _ := http.NewRequest("GET", "/headers", nil)
 	req.Header = map[string][]string{
 		"Header1": {"value1"},
@@ -43,7 +44,7 @@ Host:
 	req.Header.Set(trustedPortHeader, "1025")
 
 	w := httptest.NewRecorder()
-	app.ServeHTTP(w, req)
+	engine.ServeHTTP(w, req)
 
 	assert.Equal(t, 200, w.Code)
 	assert.Equal(t, contentType.text, w.Header().Get("Content-Type"))

router/port_scanner.go

@@ -17,7 +17,7 @@ type JSONScanResponse struct {
 	Reason    string `json:"reason"`
 }
 
-func scanTCPPort(ctx *gin.Context) {
+func (rt *Router) scanTCPPort(ctx *gin.Context) {
 	port, err := strconv.Atoi(ctx.Params.ByName("port"))
 	if err == nil && (port < 1 || port > 65535) {
 		err = fmt.Errorf("%d is not a valid port number", port)
@@ -29,8 +29,16 @@ func scanTCPPort(ctx *gin.Context) {
 		return
 	}
 
+	ip := net.ParseIP(ctx.ClientIP())
+	if ip == nil {
+		ctx.JSON(http.StatusBadRequest, JSONScanResponse{
+			Reason: "client ip could not be determined",
+		})
+		return
+	}
+
 	add := net.TCPAddr{
-		IP:   net.ParseIP(ctx.ClientIP()),
+		IP:   ip,
 		Port: port,
 	}
 

router/setup.go

@@ -4,30 +4,49 @@ import (
 	"html/template"
 	"log"
 
-	"github.com/dcarrillo/whatismyip/internal/setting"
+	"github.com/dcarrillo/whatismyip/service"
 	"github.com/gin-gonic/gin"
 )
 
-func SetupTemplate(r *gin.Engine) {
-	if setting.App.TemplatePath == "" {
-		t, _ := template.New("home").Parse(home)
-		r.SetHTMLTemplate(t)
-	} else {
-		log.Printf("Template %s has been loaded", setting.App.TemplatePath)
-		r.LoadHTMLFiles(setting.App.TemplatePath)
+type Router struct {
+	geo               *service.Geo
+	trustedHeader     string
+	trustedPortHeader string
+	templatePath      string
+	disableScan       bool
+}
+
+func NewRouter(geo *service.Geo, trustedHeader, trustedPortHeader, templatePath string, disableScan bool) *Router {
+	return &Router{
+		geo:               geo,
+		trustedHeader:     trustedHeader,
+		trustedPortHeader: trustedPortHeader,
+		templatePath:      templatePath,
+		disableScan:       disableScan,
 	}
 }
 
-func Setup(r *gin.Engine) {
-	r.GET("/", getRoot)
-	r.GET("/scan/tcp/:port", scanTCPPort)
-	r.GET("/client-port", getClientPortAsString)
-	r.GET("/geo", getGeoAsString)
-	r.GET("/geo/:field", getGeoAsString)
-	r.GET("/asn", getASNAsString)
-	r.GET("/asn/:field", getASNAsString)
-	r.GET("/headers", getHeadersAsSortedString)
-	r.GET("/all", getAllAsString)
-	r.GET("/json", getJSON)
-	r.GET("/:header", getHeaderAsString)
+func SetupTemplate(r *gin.Engine, templatePath string) {
+	if templatePath == "" {
+		r.SetHTMLTemplate(template.Must(template.New("home").Parse(home)))
+	} else {
+		log.Printf("Template %s has been loaded", templatePath)
+		r.LoadHTMLFiles(templatePath)
+	}
+}
+
+func Setup(r *gin.Engine, rt *Router) {
+	r.GET("/", rt.getRoot)
+	if !rt.disableScan {
+		r.GET("/scan/tcp/:port", rt.scanTCPPort)
+	}
+	r.GET("/client-port", rt.getClientPortAsString)
+	r.GET("/geo", rt.getGeoAsString)
+	r.GET("/geo/:field", rt.getGeoAsString)
+	r.GET("/asn", rt.getASNAsString)
+	r.GET("/asn/:field", rt.getASNAsString)
+	r.GET("/headers", rt.getHeadersAsSortedString)
+	r.GET("/all", rt.getAllAsString)
+	r.GET("/json", rt.getJSON)
+	r.GET("/:header", rt.getHeaderAsString)
 }

router/setup_test.go

@@ -1,10 +1,11 @@
 package router
 
 import (
+	"context"
 	"os"
 	"testing"
 
-	"github.com/dcarrillo/whatismyip/models"
+	"github.com/dcarrillo/whatismyip/service"
 	"github.com/gin-gonic/gin"
 )
 
@@ -34,9 +35,9 @@ var (
 		text: "text/plain; charset=utf-8",
 		json: "application/json; charset=utf-8",
 	}
-	jsonIPv4     = `{"client_port":"1001","ip":"81.2.69.192","ip_version":4,"country":"United Kingdom","country_code":"GB","city":"London","latitude":51.5142,"longitude":-0.0931,"postal_code":"","time_zone":"Europe/London","asn":0,"asn_organization":"","host":"test", "headers": {}}`
-	jsonIPv6     = `{"asn":3352, "asn_organization":"TELEFONICA DE ESPANA", "city":"", "client_port":"1001", "country":"", "country_code":"", "host":"test", "ip":"2a02:9000::1", "ip_version":6, "latitude":0, "longitude":0, "postal_code":"", "time_zone":"", "headers": {}}`
-	jsonDNSIPv4  = `{"dns":{"ip":"81.2.69.192","country":"United Kingdom","provider":""}}`
+	jsonIPv4     = `{"client_port":"1001","ip":"81.2.69.192","ip_version":4,"country":"United Kingdom","country_code":"GB","city":"London","latitude":51.5142,"longitude":-0.0931,"time_zone":"Europe/London","host":"test", "headers": {}}`
+	jsonIPv6     = `{"asn":3352,"asn_organization":"TELEFONICA DE ESPANA","client_port":"1001","host":"test","ip":"2a02:9000::1","ip_version":6,"headers": {}}`
+	jsonDNSIPv4  = `{"dns":{"ip":"81.2.69.192","country":"United Kingdom"}}`
 	plainDNSIPv4 = "81.2.69.192 (United Kingdom / )\n"
 )
 
@@ -46,12 +47,14 @@ const (
 	domain            = "dns.example.com"
 )
 
+var rt *Router
+
 func TestMain(m *testing.M) {
 	app = gin.Default()
 	app.TrustedPlatform = trustedHeader
-	models.Setup("../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
-	Setup(app)
-	defer models.CloseDBs()
+	svc, _ := service.NewGeo(context.Background(), "../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
+	rt = NewRouter(svc, trustedHeader, "", "", false)
+	Setup(app, rt)
 
 	os.Exit(m.Run())
 }

router/templates_test.go

@@ -62,20 +62,22 @@ func TestDefaultTemplate(t *testing.T) {
 
 	tmpl, _ := template.New("home").Parse(home)
 	response := JSONResponse{
-		IP:              "127.0.0.1",
-		IPVersion:       4,
-		ClientPort:      "1000",
-		Country:         "A Country",
-		CountryCode:     "XX",
-		City:            "A City",
-		Latitude:        100,
-		Longitude:       -100,
-		PostalCode:      "00000",
-		TimeZone:        "My/Timezone",
-		ASN:             0,
-		ASNOrganization: "My ISP",
-		Host:            "localhost",
-		Headers:         req.Header,
+		IP:         "127.0.0.1",
+		IPVersion:  4,
+		ClientPort: "1000",
+		Host:       "localhost",
+		Headers:    req.Header,
+		GeoResponse: GeoResponse{
+			Country:         "A Country",
+			CountryCode:     "XX",
+			City:            "A City",
+			Latitude:        100,
+			Longitude:       -100,
+			PostalCode:      "00000",
+			TimeZone:        "My/Timezone",
+			ASN:             0,
+			ASNOrganization: "My ISP",
+		},
 	}
 
 	buf := &bytes.Buffer{}

server/dns.go

@@ -41,8 +41,10 @@ func (d *DNS) Start() {
 }
 
 func (d *DNS) Stop() {
-	log.Printf("Stopping DNS server...")
-	if err := d.server.Shutdown(); err != nil {
+	log.Print("Stopping DNS server...")
+	ctx, cancel := context.WithTimeout(d.ctx, shutdownTimeout)
+	defer cancel()
+	if err := d.server.ShutdownContext(ctx); err != nil {
 		log.Printf("DNS server forced to shutdown: %s", err)
 	}
 }

server/prometheus.go

@@ -0,0 +1,53 @@
+package server
+
+import (
+	"context"
+	"errors"
+	"log"
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+type Prometheus struct {
+	server   *http.Server
+	ctx      context.Context
+	addr     string
+	timeouts Timeouts
+}
+
+func NewPrometheusServer(ctx context.Context, addr string, timeouts Timeouts) *Prometheus {
+	return &Prometheus{
+		ctx:      ctx,
+		addr:     addr,
+		timeouts: timeouts,
+	}
+}
+
+func (p *Prometheus) Start() {
+	mux := http.NewServeMux()
+	mux.Handle("/metrics", promhttp.Handler())
+
+	p.server = &http.Server{
+		Addr:         p.addr,
+		Handler:      mux,
+		ReadTimeout:  p.timeouts.ReadTimeout,
+		WriteTimeout: p.timeouts.WriteTimeout,
+	}
+
+	log.Printf("Starting Prometheus server listening on %s", p.addr)
+	go func() {
+		if err := p.server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			log.Fatal(err)
+		}
+	}()
+}
+
+func (p *Prometheus) Stop() {
+	log.Print("Stopping Prometheus server...")
+	ctx, cancel := context.WithTimeout(p.ctx, shutdownTimeout)
+	defer cancel()
+	if err := p.server.Shutdown(ctx); err != nil {
+		log.Printf("Prometheus server forced to shutdown: %s", err)
+	}
+}

server/quic.go

@@ -6,7 +6,6 @@ import (
 	"log"
 	"net/http"
 
-	"github.com/dcarrillo/whatismyip/internal/setting"
 	"github.com/quic-go/quic-go/http3"
 )
 
@@ -14,33 +13,39 @@ type Quic struct {
 	server    *http3.Server
 	tlsServer *TLS
 	ctx       context.Context
+	addr      string
+	crtPath   string
+	keyPath   string
 }
 
-func NewQuicServer(ctx context.Context, tlsServer *TLS) *Quic {
+func NewQuicServer(ctx context.Context, tlsServer *TLS, addr, crt, key string) *Quic {
 	return &Quic{
 		tlsServer: tlsServer,
 		ctx:       ctx,
+		addr:      addr,
+		crtPath:   crt,
+		keyPath:   key,
 	}
 }
 
 func (q *Quic) Start() {
 	q.server = &http3.Server{
-		Addr:    setting.App.TLSAddress,
+		Addr:    q.addr,
 		Handler: q.tlsServer.server.Handler,
 	}
 
 	parentHandler := q.tlsServer.server.Handler
 	q.tlsServer.server.Handler = http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
 		if err := q.server.SetQUICHeaders(rw.Header()); err != nil {
-			log.Fatal(err)
+			log.Printf("Failed to set QUIC headers: %s", err)
 		}
 
 		parentHandler.ServeHTTP(rw, req)
 	})
 
-	log.Printf("Starting QUIC server listening on %s (udp)", setting.App.TLSAddress)
+	log.Printf("Starting QUIC server listening on %s (udp)", q.addr)
 	go func() {
-		if err := q.server.ListenAndServeTLS(setting.App.TLSCrtPath, setting.App.TLSKeyPath); err != nil &&
+		if err := q.server.ListenAndServeTLS(q.crtPath, q.keyPath); err != nil &&
 			!errors.Is(err, http.ErrServerClosed) {
 			log.Fatal(err)
 		}
@@ -48,8 +53,10 @@ func (q *Quic) Start() {
 }
 
 func (q *Quic) Stop() {
-	log.Printf("Stopping QUIC server...")
-	if err := q.server.Close(); err != nil {
-		log.Printf("QUIC server forced to shutdown")
+	log.Print("Stopping QUIC server...")
+	ctx, cancel := context.WithTimeout(q.ctx, shutdownTimeout)
+	defer cancel()
+	if err := q.server.Shutdown(ctx); err != nil {
+		log.Printf("QUIC server forced to shutdown: %s", err)
 	}
 }

server/server.go

@@ -5,11 +5,13 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
-	"github.com/dcarrillo/whatismyip/internal/setting"
-	"github.com/dcarrillo/whatismyip/models"
+	"github.com/dcarrillo/whatismyip/service"
 )
 
+const shutdownTimeout = 10 * time.Second
+
 type Server interface {
 	Start()
 	Stop()
@@ -17,33 +19,36 @@ type Server interface {
 
 type Manager struct {
 	servers []Server
+	geoSvc  *service.Geo
 }
 
-func Setup(servers []Server) *Manager {
+func Setup(servers []Server, geoSvc *service.Geo) *Manager {
 	return &Manager{
 		servers: servers,
+		geoSvc:  geoSvc,
 	}
 }
 
 func (m *Manager) Run() {
 	m.start()
 
-	models.Setup(setting.App.GeodbPath.City, setting.App.GeodbPath.ASN)
-	signalChan := make(chan os.Signal, len(m.servers))
+	signalChan := make(chan os.Signal, 1)
 	signal.Notify(signalChan, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
-	var s os.Signal
 	for {
-		s = <-signalChan
+		s := <-signalChan
 
 		if s == syscall.SIGHUP {
 			m.stop()
-			models.CloseDBs()
-			models.Setup(setting.App.GeodbPath.City, setting.App.GeodbPath.ASN)
+			if m.geoSvc != nil {
+				m.geoSvc.Reload()
+			}
 			m.start()
 		} else {
-			log.Printf("Shutting down...")
+			log.Print("Shutting down...")
 			m.stop()
-			models.CloseDBs()
+			if m.geoSvc != nil {
+				m.geoSvc.Shutdown()
+			}
 			break
 		}
 	}

server/tcp.go

@@ -5,32 +5,40 @@ import (
 	"errors"
 	"log"
 	"net/http"
-
-	"github.com/dcarrillo/whatismyip/internal/setting"
+	"time"
 )
 
-type TCP struct {
-	server  *http.Server
-	handler *http.Handler
-	ctx     context.Context
+type Timeouts struct {
+	ReadTimeout  time.Duration
+	WriteTimeout time.Duration
 }
 
-func NewTCPServer(ctx context.Context, handler *http.Handler) *TCP {
+type TCP struct {
+	server   *http.Server
+	handler  http.Handler
+	ctx      context.Context
+	addr     string
+	timeouts Timeouts
+}
+
+func NewTCPServer(ctx context.Context, handler http.Handler, addr string, timeouts Timeouts) *TCP {
 	return &TCP{
-		handler: handler,
-		ctx:     ctx,
+		handler:  handler,
+		ctx:      ctx,
+		addr:     addr,
+		timeouts: timeouts,
 	}
 }
 
 func (t *TCP) Start() {
 	t.server = &http.Server{
-		Addr:         setting.App.BindAddress,
-		Handler:      *t.handler,
-		ReadTimeout:  setting.App.Server.ReadTimeout,
-		WriteTimeout: setting.App.Server.WriteTimeout,
+		Addr:         t.addr,
+		Handler:      t.handler,
+		ReadTimeout:  t.timeouts.ReadTimeout,
+		WriteTimeout: t.timeouts.WriteTimeout,
 	}
 
-	log.Printf("Starting TCP server listening on %s", setting.App.BindAddress)
+	log.Printf("Starting TCP server listening on %s", t.addr)
 	go func() {
 		if err := t.server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
 			log.Fatal(err)
@@ -39,8 +47,10 @@ func (t *TCP) Start() {
 }
 
 func (t *TCP) Stop() {
-	log.Printf("Stopping TCP server...")
-	if err := t.server.Shutdown(t.ctx); err != nil {
+	log.Print("Stopping TCP server...")
+	ctx, cancel := context.WithTimeout(t.ctx, shutdownTimeout)
+	defer cancel()
+	if err := t.server.Shutdown(ctx); err != nil {
 		log.Printf("TCP server forced to shutdown: %s", err)
 	}
 }

server/tls.go

@@ -2,37 +2,47 @@ package server
 
 import (
 	"context"
+	"crypto/tls"
 	"errors"
 	"log"
 	"net/http"
-
-	"github.com/dcarrillo/whatismyip/internal/setting"
 )
 
 type TLS struct {
-	server  *http.Server
-	handler *http.Handler
-	ctx     context.Context
+	server   *http.Server
+	handler  http.Handler
+	ctx      context.Context
+	addr     string
+	crtPath  string
+	keyPath  string
+	timeouts Timeouts
 }
 
-func NewTLSServer(ctx context.Context, handler *http.Handler) *TLS {
+func NewTLSServer(ctx context.Context, handler http.Handler, addr, crt, key string, timeouts Timeouts) *TLS {
 	return &TLS{
-		handler: handler,
-		ctx:     ctx,
+		handler:  handler,
+		ctx:      ctx,
+		addr:     addr,
+		crtPath:  crt,
+		keyPath:  key,
+		timeouts: timeouts,
 	}
 }
 
 func (t *TLS) Start() {
 	t.server = &http.Server{
-		Addr:         setting.App.TLSAddress,
-		Handler:      *t.handler,
-		ReadTimeout:  setting.App.Server.ReadTimeout,
-		WriteTimeout: setting.App.Server.WriteTimeout,
+		Addr:         t.addr,
+		Handler:      t.handler,
+		ReadTimeout:  t.timeouts.ReadTimeout,
+		WriteTimeout: t.timeouts.WriteTimeout,
+		TLSConfig: &tls.Config{
+			MinVersion: tls.VersionTLS12,
+		},
 	}
 
-	log.Printf("Starting TLS server listening on %s", setting.App.TLSAddress)
+	log.Printf("Starting TLS server listening on %s", t.addr)
 	go func() {
-		if err := t.server.ListenAndServeTLS(setting.App.TLSCrtPath, setting.App.TLSKeyPath); err != nil &&
+		if err := t.server.ListenAndServeTLS(t.crtPath, t.keyPath); err != nil &&
 			!errors.Is(err, http.ErrServerClosed) {
 			log.Fatal(err)
 		}
@@ -40,8 +50,10 @@ func (t *TLS) Start() {
 }
 
 func (t *TLS) Stop() {
-	log.Printf("Stopping TLS server...")
-	if err := t.server.Shutdown(t.ctx); err != nil {
+	log.Print("Stopping TLS server...")
+	ctx, cancel := context.WithTimeout(t.ctx, shutdownTimeout)
+	defer cancel()
+	if err := t.server.Shutdown(ctx); err != nil {
 		log.Printf("TLS server forced to shutdown: %s", err)
 	}
 }

service/geo.go

@@ -1,37 +1,91 @@
 package service
 
 import (
+	"context"
 	"log"
 	"net"
+	"sync"
 
+	"github.com/dcarrillo/whatismyip/internal/metrics"
 	"github.com/dcarrillo/whatismyip/models"
 )
 
-// Geo defines a base type for lookups
 type Geo struct {
-	IP net.IP
+	ctx    context.Context
+	cancel context.CancelFunc
+	db     *models.GeoDB
+	mu     sync.RWMutex
 }
 
-// LookUpCity queries the database for city data related to the given IP
-func (g *Geo) LookUpCity() *models.GeoRecord {
-	record := &models.GeoRecord{}
-	err := record.LookUp(g.IP)
+func NewGeo(ctx context.Context, cityPath string, asnPath string) (*Geo, error) {
+	ctx, cancel := context.WithCancel(ctx)
+
+	db, err := models.Setup(cityPath, asnPath)
 	if err != nil {
-		log.Println(err)
+		cancel()
+		return nil, err
+	}
+
+	geo := &Geo{
+		ctx:    ctx,
+		cancel: cancel,
+		db:     db,
+	}
+
+	return geo, nil
+}
+
+func (g *Geo) LookUpCity(ip net.IP) *models.GeoRecord {
+	g.mu.RLock()
+	defer g.mu.RUnlock()
+
+	record, err := g.db.LookupCity(ip)
+	if err != nil {
+		log.Print(err)
 		return nil
 	}
 
+	metrics.RecordGeoLookup("city")
 	return record
 }
 
-// LookUpASN queries the database for ASN data related to the given IP
-func (g *Geo) LookUpASN() *models.ASNRecord {
-	record := &models.ASNRecord{}
-	err := record.LookUp(g.IP)
+func (g *Geo) LookUpASN(ip net.IP) *models.ASNRecord {
+	g.mu.RLock()
+	defer g.mu.RUnlock()
+
+	record, err := g.db.LookupASN(ip)
 	if err != nil {
-		log.Println(err)
+		log.Print(err)
 		return nil
 	}
 
+	metrics.RecordGeoLookup("asn")
 	return record
 }
+
+func (g *Geo) Shutdown() {
+	g.cancel()
+
+	g.mu.Lock()
+	defer g.mu.Unlock()
+
+	if err := g.db.CloseDBs(); err != nil {
+		log.Printf("Error closing geo databases: %s", err)
+	}
+}
+
+func (g *Geo) Reload() {
+	if err := g.ctx.Err(); err != nil {
+		log.Printf("Skipping reload, service is shutting down: %v", err)
+		return
+	}
+
+	g.mu.Lock()
+	defer g.mu.Unlock()
+
+	if err := g.db.Reload(); err != nil {
+		log.Printf("Geo database reload failed: %s", err)
+		return
+	}
+	log.Print("Geo database reloaded")
+}

service/geo_test.go

@@ -1,36 +1,67 @@
 package service
 
 import (
+	"context"
 	"net"
 	"os"
+	"sync"
 	"testing"
 
-	"github.com/dcarrillo/whatismyip/models"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
+var geoSvc *Geo
+
 func TestMain(m *testing.M) {
-	models.Setup("../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
-	defer models.CloseDBs()
+	geoSvc, _ = NewGeo(context.Background(), "../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
 	os.Exit(m.Run())
 }
 
 func TestCityLookup(t *testing.T) {
-	ip := Geo{IP: net.ParseIP("error")}
-	c := ip.LookUpCity()
+	c := geoSvc.LookUpCity(net.ParseIP("error"))
 	assert.Nil(t, c)
 
-	ip = Geo{IP: net.ParseIP("1.1.1.1")}
-	c = ip.LookUpCity()
+	c = geoSvc.LookUpCity(net.ParseIP("1.1.1.1"))
 	assert.NotNil(t, c)
 }
 
 func TestASNLookup(t *testing.T) {
-	ip := Geo{IP: net.ParseIP("error")}
-	a := ip.LookUpASN()
+	a := geoSvc.LookUpASN(net.ParseIP("error"))
 	assert.Nil(t, a)
 
-	ip = Geo{IP: net.ParseIP("1.1.1.1")}
-	a = ip.LookUpASN()
+	a = geoSvc.LookUpASN(net.ParseIP("1.1.1.1"))
 	assert.NotNil(t, a)
 }
+
+func TestReloadIsSafeForConcurrentLookups(t *testing.T) {
+	svc, err := NewGeo(context.Background(), "../test/GeoIP2-City-Test.mmdb", "../test/GeoLite2-ASN-Test.mmdb")
+	require.NoError(t, err)
+	defer svc.Shutdown()
+
+	ip := net.ParseIP("81.2.69.192")
+
+	var wg sync.WaitGroup
+	stop := make(chan struct{})
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		for {
+			select {
+			case <-stop:
+				return
+			default:
+				svc.LookUpCity(ip)
+				svc.LookUpASN(ip)
+			}
+		}
+	}()
+
+	for range 100 {
+		svc.Reload()
+	}
+	close(stop)
+	wg.Wait()
+
+	assert.NotNil(t, svc.LookUpCity(ip))
+}

service/port_scanner.go

@@ -3,6 +3,8 @@ package service
 import (
 	"net"
 	"time"
+
+	"github.com/dcarrillo/whatismyip/internal/metrics"
 )
 
 const scannerTimeOut = 3 * time.Second
@@ -20,5 +22,6 @@ func (p *PortScanner) IsPortOpen() (bool, error) {
 		defer conn.Close()
 	}
 
+	metrics.RecordPortScan()
 	return true, nil
 }

test/Dockerfile

@@ -1,7 +1,7 @@
-FROM golang:1.22-alpine as builder
+FROM golang:1.25-alpine AS builder
 
 ARG ARG_VERSION
-ENV VERSION $ARG_VERSION
+ENV VERSION=$ARG_VERSION
 
 WORKDIR /app
 COPY . .