tracing: skip health checks for tracing, small logging improvements

.drone.yml

@@ -1,10 +1,11 @@
+---
 kind: pipeline
 type: kubernetes
 name: default
 
 steps:
 - name: test
-  image: golang:1.18
+  image: golang:1.23.4
   volumes:
   - name: deps
     path: /go
@@ -28,3 +29,8 @@ steps:
       from_secret: harbor_username
     password:
       from_secret: harbor_password
+---
+kind: signature
+hmac: d92e5a575088ed17ad15dbf7bf34f79f1d6b61c09d8b05fc7aab58f94c011e01
+
+...

.gitignore

@@ -1,2 +1,2 @@
-geoipapi
+./geoipapi
 *~

Dockerfile

@@ -1,13 +1,14 @@
-FROM golang:1.18-alpine3.15 AS build
+FROM golang:1.23.4-alpine AS build
 RUN apk --no-cache add git
 
 WORKDIR /go/src/github.com/abh/geoipapi
 ADD . /go/src/github.com/abh/geoipapi
 RUN go install -v ./...
 
-FROM alpine:3.15
+FROM alpine:3.21
 USER root
 RUN apk --no-cache add ca-certificates
+RUN apk --no-cache upgrade
 
 RUN addgroup geoip && adduser -D -G geoip geoip
 WORKDIR /geoip/

client/geoipapi/geoipclient.go

@@ -0,0 +1,77 @@
+package geoipapi
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"net/netip"
+	"net/url"
+	"os"
+	"time"
+
+	"github.com/oschwald/geoip2-golang"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+)
+
+var client http.Client
+
+func init() {
+	netTransport := &http.Transport{
+		Dial: (&net.Dialer{
+			Timeout: 5 * time.Second,
+		}).Dial,
+		TLSHandshakeTimeout: 5 * time.Second,
+	}
+	client = http.Client{
+		Timeout:   time.Second * 10,
+		Transport: netTransport,
+	}
+}
+
+func GetCity(ctx context.Context, ip netip.Addr) (*geoip2.City, error) {
+	ctx, span := otel.Tracer("geoipapi").Start(ctx, "geoip.GetCity")
+	defer span.End()
+
+	baseURL := os.Getenv("geoip_service")
+	if len(baseURL) == 0 {
+		return nil, fmt.Errorf("geoip_service not configured")
+	}
+
+	q := url.Values{}
+	q.Set("ip", ip.String())
+
+	span.SetAttributes(attribute.String("ip", ip.String()))
+
+	reqURL, err := url.Parse(fmt.Sprintf("http://%s/api/json?%s", baseURL, q.Encode()))
+	if err != nil {
+		span.RecordError(err)
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "GET", reqURL.String(), nil)
+	if err != nil {
+		span.RecordError(err)
+		return nil, err
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		span.RecordError(err)
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	dec := json.NewDecoder(resp.Body)
+
+	city := geoip2.City{}
+	err = dec.Decode(&city)
+	if err != nil {
+		span.RecordError(err)
+		return nil, err
+	}
+
+	return &city, nil
+}

geoipapi.go

@@ -1,16 +1,27 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"log"
 	"net"
 	"net/http"
 	"os"
+	"os/signal"
 	"path/filepath"
 	"strings"
+	"syscall"
+	"time"
 
 	"github.com/oschwald/geoip2-golang"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
+
+	"go.ntppool.org/common/logger"
+	"go.ntppool.org/common/tracing"
+	"go.ntppool.org/common/version"
 )
 
 type geoType uint8
@@ -25,26 +36,39 @@ var dbFiles map[geoType][]string
 
 func init() {
 	dbFiles = map[geoType][]string{
-		countryDB: []string{"GeoIP2-Country.mmdb", "GeoLite2-Country.mmdb"},
-		asnDB:     []string{"GeoIP2-ISP.mmdb"},
-		cityDB:    []string{"GeoIP2-City.mmdb", "GeoLite2-City.mmdb"},
+		countryDB: {"GeoIP2-Country.mmdb", "GeoLite2-Country.mmdb"},
+		asnDB:     {"GeoIP2-ISP.mmdb"},
+		cityDB:    {"GeoIP2-City.mmdb", "GeoLite2-City.mmdb"},
 	}
 }
 
 func main() {
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, os.Kill, syscall.SIGTERM)
+	defer cancel()
+
+	log := logger.FromContext(ctx)
+
+	tpShutdown, err := tracing.SetupSDK(ctx, &tracing.TracerConfig{
+		ServiceName: "geoipapi",
+	})
+	if err != nil {
+		log.ErrorContext(ctx, "could not setup tracing", "err", err)
+		os.Exit(2)
+	}
+	defer tpShutdown(context.Background()) // todo: with timeout
 
 	rdr, err := open(cityDB)
 	if err != nil {
-		log.Fatalf("opening db: %s", err)
+		log.ErrorContext(ctx, "could not open geodb", "err", err)
+		os.Exit(3)
 	}
 
 	if len(os.Args) > 1 {
 		for _, str := range os.Args[1:] {
-			log.Printf("%q", str)
 			ip := net.ParseIP(str)
 			city, err := rdr.City(ip)
 			if err != nil {
-				log.Printf("error looking up %q: %s", ip, err)
+				fmt.Printf("error looking up %q\n: %s", ip, err)
 				continue
 			}
 			fmt.Printf("%s: %s\n", ip, city.Country.IsoCode)
@@ -52,54 +76,98 @@ func main() {
 		os.Exit(0)
 	}
 
-	err = setupHTTP(rdr)
+	err = setupHTTP(ctx)
 	if err != nil {
-		log.Fatalf("http: %s", err)
+		log.ErrorContext(ctx, "http server", "err", err)
 	}
 }
 
-func setupHTTP(rdr *geoip2.Reader) error {
+func setupHTTP(ctx context.Context) error {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/api/country", handleCountry)
 	mux.HandleFunc("/api/json", handleJSON)
 	mux.HandleFunc("/healthz", handleHealth)
-	return http.ListenAndServe(":8009", mux)
+
+	versionHandler := func(next http.Handler) http.Handler {
+		vinfo := version.VersionInfo()
+		v := "geoipapi/" + vinfo.Version + "+" + vinfo.GitRevShort
+		return http.HandlerFunc(
+			func(w http.ResponseWriter, r *http.Request) {
+				w.Header().Set("Server", v)
+				span := trace.SpanFromContext(r.Context())
+				w.Header().Set("Traceparent", span.SpanContext().TraceID().String())
+				next.ServeHTTP(w, r)
+			})
+	}
+
+	srv := &http.Server{
+		Addr:         ":8009",
+		BaseContext:  func(_ net.Listener) context.Context { return ctx },
+		ReadTimeout:  time.Second,
+		WriteTimeout: 10 * time.Second,
+		Handler: otelhttp.NewHandler(
+			versionHandler(mux),
+			"geoipapi",
+			otelhttp.WithFilter(func(r *http.Request) bool {
+				return r.URL.Path != "/healthz"
+			}),
+		),
+	}
+	srvErr := make(chan error, 1)
+	go func() {
+		srvErr <- srv.ListenAndServe()
+	}()
+
+	select {
+	case err := <-srvErr:
+		// Error when starting HTTP server.
+		return err
+	case <-ctx.Done():
+	}
+
+	return srv.Shutdown(context.Background())
 }
 
-func getCityIP(ip net.IP) (*geoip2.City, error) {
+func getCityIP(ctx context.Context, ip net.IP) (*geoip2.City, error) {
 	rdr, err := open(cityDB)
 	if err != nil {
 		return nil, err
 	}
 	city, err := rdr.City(ip)
 	if err != nil {
-		log.Printf("error looking up %q: %s", ip, err)
+		logger.FromContext(ctx).WarnContext(ctx, "error looking up city", "ip", ip, "err", err)
 		return nil, fmt.Errorf("db lookup error")
 	}
 	return city, nil
 }
 
 func getCity(req *http.Request) (*geoip2.City, error) {
+	ctx := req.Context()
+	span := trace.SpanFromContext(ctx)
 	req.ParseForm()
 	ipStr := req.FormValue("ip")
+	span.SetAttributes(attribute.String("ip", ipStr))
 	ip := net.ParseIP(ipStr)
 	if ip == nil {
 		return nil, fmt.Errorf("missing IP address")
 	}
-	return getCityIP(ip)
+	return getCityIP(ctx, ip)
 }
 
 func handleJSON(w http.ResponseWriter, req *http.Request) {
+	ctx := req.Context()
+	span := trace.SpanFromContext(ctx)
+	span.SetName("/api/json")
 	city, err := getCity(req)
 	if err != nil {
-		log.Printf("getCity error: %s", err)
+		logger.FromContext(ctx).ErrorContext(ctx, "getCity error ", "err", err)
 		http.Error(w, "data error", 500)
 		return
 	}
 
 	b, err := json.Marshal(&city)
 	if err != nil {
-		log.Printf("Error marshaling JSON: %s", err)
+		logger.FromContext(ctx).ErrorContext(ctx, "error marshaling JSON", "err", err)
 		http.Error(w, "internal error", 500)
 		return
 	}
@@ -108,9 +176,13 @@ func handleJSON(w http.ResponseWriter, req *http.Request) {
 }
 
 func handleCountry(w http.ResponseWriter, req *http.Request) {
+	ctx := req.Context()
+	span := trace.SpanFromContext(ctx)
+	span.SetName("/api/country")
+
 	city, err := getCity(req)
 	if err != nil {
-		log.Printf("getCity error: %s", err)
+		logger.FromContext(ctx).ErrorContext(ctx, "getCity error ", "err", err)
 		http.Error(w, "data error", 500)
 		return
 	}
@@ -120,10 +192,15 @@ func handleCountry(w http.ResponseWriter, req *http.Request) {
 }
 
 func handleHealth(w http.ResponseWriter, req *http.Request) {
+	ctx := req.Context()
+	span := trace.SpanFromContext(ctx)
+	span.SetAttributes(attribute.Bool("app.drop_sample", true))
+	span.SetName("/healthz")
+
 	ip := net.ParseIP("199.43.0.43")
-	city, err := getCityIP(ip)
+	city, err := getCityIP(ctx, ip)
 	if err != nil {
-		log.Printf("getCity error: %s", err)
+		logger.FromContext(ctx).WarnContext(ctx, "health check getCity error ", "ip", ip, "err", err)
 		http.Error(w, "data error", 500)
 		return
 	}
@@ -133,7 +210,6 @@ func handleHealth(w http.ResponseWriter, req *http.Request) {
 }
 
 func open(t geoType) (*geoip2.Reader, error) {
-
 	dir := findDB()
 
 	var fileName string
@@ -153,15 +229,16 @@ func open(t geoType) (*geoip2.Reader, error) {
 	rdr, err := geoip2.Open(fileName)
 
 	return rdr, err
-
 }
 
 func findDB() string {
 	dirs := []string{
-		"/usr/share/GeoIP/",       // Linux default
-		"/usr/share/local/GeoIP/", // source install?
-		"/usr/local/share/GeoIP/", // FreeBSD
-		"/opt/local/share/GeoIP/", // MacPorts
+		"/usr/share/GeoIP/",        // Linux default
+		"/usr/share/local/GeoIP/",  // source install?
+		"/usr/local/share/GeoIP/",  // FreeBSD
+		"/opt/local/share/GeoIP/",  // MacPorts
+		"/opt/homebrew/var/GeoIP/", // Homebrew
+
 	}
 	for _, dir := range dirs {
 		if _, err := os.Stat(dir); err != nil {

go.mod

@@ -1,9 +1,66 @@
 module go.ntppool.org/geoipapi
 
-go 1.15
+go 1.23
+
+toolchain go1.24rc1
 
 require (
-	github.com/oschwald/geoip2-golang v1.7.0
-	golang.org/x/sys v0.0.0-20220406163625-3f8b81556e12 // indirect
-	gopkg.in/yaml.v2 v2.2.2 // indirect
+	github.com/oschwald/geoip2-golang v1.11.0
+	go.ntppool.org/common v0.3.1
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.58.0
+	go.opentelemetry.io/otel v1.33.0
+	go.opentelemetry.io/otel/trace v1.33.0
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.25.1 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/oschwald/maxminddb-golang v1.13.1 // indirect
+	github.com/prometheus/client_golang v1.20.5 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.61.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/remychantenay/slog-otel v1.3.2 // indirect
+	github.com/samber/lo v1.47.0 // indirect
+	github.com/samber/slog-multi v1.3.3 // indirect
+	github.com/spf13/cobra v1.8.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/contrib/bridges/otelslog v0.8.0 // indirect
+	go.opentelemetry.io/contrib/bridges/prometheus v0.58.0 // indirect
+	go.opentelemetry.io/contrib/exporters/autoexport v0.58.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.9.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.9.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/prometheus v0.55.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.9.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.33.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.33.0 // indirect
+	go.opentelemetry.io/otel/log v0.9.0 // indirect
+	go.opentelemetry.io/otel/metric v1.33.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.33.0 // indirect
+	go.opentelemetry.io/otel/sdk/log v0.9.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.33.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.5.0 // indirect
+	golang.org/x/mod v0.22.0 // indirect
+	golang.org/x/net v0.34.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20250115164207-1a7da9e5054f // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250115164207-1a7da9e5054f // indirect
+	google.golang.org/grpc v1.69.4 // indirect
+	google.golang.org/protobuf v1.36.3 // indirect
 )

go.sum

@@ -1,30 +1,130 @@
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/oschwald/geoip2-golang v1.3.0 h1:D+Hsdos1NARPbzZ2aInUHZL+dApIzo8E0ErJVsWcku8=
-github.com/oschwald/geoip2-golang v1.3.0/go.mod h1:0LTTzix/Ao1uMvOhAV4iLU0Lz7eCrP94qZWBTDKf0iE=
-github.com/oschwald/geoip2-golang v1.4.0 h1:5RlrjCgRyIGDz/mBmPfnAF4h8k0IAcRv9PvrpOfz+Ug=
-github.com/oschwald/geoip2-golang v1.4.0/go.mod h1:8QwxJvRImBH+Zl6Aa6MaIcs5YdlZSTKtzmPGzQqi9ng=
-github.com/oschwald/geoip2-golang v1.7.0 h1:JW1r5AKi+vv2ujSxjKthySK3jo8w8oKWPyXsw+Qs/S8=
-github.com/oschwald/geoip2-golang v1.7.0/go.mod h1:mdI/C7iK7NVMcIDDtf4bCKMJ7r0o7UwGeCo9eiitCMQ=
-github.com/oschwald/maxminddb-golang v1.3.1 h1:kPc5+ieL5CC/Zn0IaXJPxDFlUxKTQEU8QBTtmfQDAIo=
-github.com/oschwald/maxminddb-golang v1.3.1/go.mod h1:3jhIUymTJ5VREKyIhWm66LJiQt04F0UCDdodShpjWsY=
-github.com/oschwald/maxminddb-golang v1.6.0/go.mod h1:DUJFucBg2cvqx42YmDa/+xHvb0elJtOm3o4aFQ/nb/w=
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-github.com/oschwald/maxminddb-golang v1.7.0/go.mod h1:RXZtst0N6+FY/3qCNmZMBApR19cdQj43/NM9VkrNAis=
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-github.com/oschwald/maxminddb-golang v1.9.0/go.mod h1:TK+s/Z2oZq0rSl4PSeAEoP0bgm82Cp5HyvYbt8K3zLY=
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+github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
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+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
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+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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