diff --git a/examples/datadog-logging-and-tracing/README.md b/examples/datadog-logging-and-tracing/README.md new file mode 100644 index 0000000..f624ed2 --- /dev/null +++ b/examples/datadog-logging-and-tracing/README.md @@ -0,0 +1,4 @@ +# DataDog Logging and Tracing + +This example demonstrates how to integrate a go-httpbin instance with DataDog's +structured logging and APM/tracing products. diff --git a/examples/datadog-logging-and-tracing/go.mod b/examples/datadog-logging-and-tracing/go.mod new file mode 100644 index 0000000..76b0f14 --- /dev/null +++ b/examples/datadog-logging-and-tracing/go.mod @@ -0,0 +1,89 @@ +module github.com/mccutchen/go-httpbin/examples/datadog-logging-and-tracing + +go 1.25.0 + +require ( + github.com/mccutchen/go-httpbin/v2 v2.23.1 + github.com/rs/zerolog v1.35.1 + gopkg.in/DataDog/dd-trace-go.v1 v1.74.8 +) + +require ( + github.com/DataDog/datadog-agent/comp/core/tagger/origindetection v0.80.2 // indirect + github.com/DataDog/datadog-agent/pkg/obfuscate v0.80.2 // indirect + github.com/DataDog/datadog-agent/pkg/opentelemetry-mapping-go/otlp/attributes v0.80.2 // indirect + github.com/DataDog/datadog-agent/pkg/proto v0.80.2 // indirect + github.com/DataDog/datadog-agent/pkg/remoteconfig/state v0.80.2 // indirect + github.com/DataDog/datadog-agent/pkg/trace v0.80.2 // indirect + github.com/DataDog/datadog-agent/pkg/trace/log v0.80.2 // indirect + github.com/DataDog/datadog-agent/pkg/trace/stats v0.80.2 // indirect + github.com/DataDog/datadog-agent/pkg/trace/traceutil v0.80.2 // indirect + github.com/DataDog/datadog-go/v5 v5.8.3 // indirect + github.com/DataDog/dd-trace-go/contrib/net/http/v2 v2.9.0 // indirect + github.com/DataDog/dd-trace-go/v2 v2.9.0 // indirect + github.com/DataDog/go-libddwaf/v4 v4.10.0 // indirect + github.com/DataDog/go-runtime-metrics-internal v0.0.4-0.20260217080614-b0f4edc38a6d // indirect + github.com/DataDog/go-sqllexer v0.2.2 // indirect + github.com/DataDog/go-tuf v1.1.1-0.5.2 // indirect + github.com/DataDog/sketches-go v1.4.8 // indirect + github.com/Microsoft/go-winio v0.6.2 // indirect + github.com/cenkalti/backoff/v5 v5.0.3 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect + github.com/cihub/seelog v0.0.0-20170130134532-f561c5e57575 // indirect + github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect + github.com/dustin/go-humanize v1.0.1 // indirect + github.com/ebitengine/purego v0.10.1 // indirect + github.com/go-ole/go-ole v1.3.0 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/hashicorp/go-version v1.9.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/klauspost/compress v1.18.6 // indirect + github.com/klauspost/cpuid/v2 v2.3.0 // indirect + github.com/linkdata/deadlock v0.5.5 // indirect + github.com/lufia/plan9stats v0.0.0-20260330125221-c963978e514e // indirect + github.com/mattn/go-colorable v0.1.15 // indirect + github.com/mattn/go-isatty v0.0.22 // indirect + github.com/minio/simdjson-go v0.4.5 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect + github.com/outcaste-io/ristretto v0.2.3 // indirect + github.com/petermattis/goid v0.0.0-20260619124436-7ab4bde3d003 // indirect + github.com/philhofer/fwd v1.2.0 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect + github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect + github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect + github.com/puzpuzpuz/xsync/v3 v3.5.1 // indirect + github.com/rs/xid v1.6.0 // indirect + github.com/secure-systems-lab/go-securesystemslib v0.11.0 // indirect + github.com/shirou/gopsutil/v4 v4.26.5 // indirect + github.com/stretchr/testify v1.11.1 // indirect + github.com/tinylib/msgp v1.6.4 // indirect + github.com/tklauser/go-sysconf v0.4.0 // indirect + github.com/tklauser/numcpus v0.12.0 // indirect + github.com/trailofbits/go-mutexasserts v0.0.0-20250514102930-c1f3d2e37561 // indirect + github.com/yusufpapurcu/wmi v1.2.4 // indirect + go.opentelemetry.io/collector/component v1.61.0 // indirect + go.opentelemetry.io/collector/featuregate v1.61.0 // indirect + go.opentelemetry.io/collector/pdata v1.61.0 // indirect + go.opentelemetry.io/collector/pdata/pprofile v0.155.0 // indirect + go.opentelemetry.io/otel v1.44.0 // indirect + go.opentelemetry.io/otel/metric v1.44.0 // indirect + go.opentelemetry.io/otel/sdk/metric v1.44.0 // indirect + go.opentelemetry.io/otel/trace v1.44.0 // indirect + go.opentelemetry.io/proto/otlp v1.10.0 // indirect + go.uber.org/atomic v1.11.0 // indirect + go.uber.org/multierr v1.11.0 // indirect + go.uber.org/zap v1.28.0 // indirect + go.yaml.in/yaml/v3 v3.0.4 // indirect + golang.org/x/crypto v0.53.0 // indirect + golang.org/x/exp v0.0.0-20260611194520-c48552f49976 // indirect + golang.org/x/mod v0.37.0 // indirect + golang.org/x/net v0.56.0 // indirect + golang.org/x/sys v0.46.0 // indirect + golang.org/x/time v0.15.0 // indirect + golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20260622175928-b703f567277d // indirect + google.golang.org/protobuf v1.36.11 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) diff --git a/examples/datadog-logging-and-tracing/go.sum b/examples/datadog-logging-and-tracing/go.sum new file mode 100644 index 0000000..34fbf97 --- /dev/null +++ b/examples/datadog-logging-and-tracing/go.sum @@ -0,0 +1,267 @@ +github.com/DataDog/datadog-agent/comp/core/tagger/origindetection v0.80.2 h1:wIUfgtkqxVjeAPAYiLy6kVKTaurI889HLk1vw5zg31c= +github.com/DataDog/datadog-agent/comp/core/tagger/origindetection v0.80.2/go.mod h1:jWIqNDi8lVJOTnvNvq8XEuM0YhLqJ/SDfu9ZQ3WXKw0= +github.com/DataDog/datadog-agent/pkg/obfuscate v0.80.2 h1:wDMDyCYc1ttLq7RmnD7TubBj4n/6li7NGUE6TWlEWw4= +github.com/DataDog/datadog-agent/pkg/obfuscate v0.80.2/go.mod h1:kV//ZZCD4UVoynNmYC/QKkWnk6P2++cuc2Axjqebpyo= +github.com/DataDog/datadog-agent/pkg/opentelemetry-mapping-go/otlp/attributes v0.80.2 h1:piwNpJ6AyA8XQ6zg78Lj7uGXKsbHYe63sSzIapwKyLU= +github.com/DataDog/datadog-agent/pkg/opentelemetry-mapping-go/otlp/attributes v0.80.2/go.mod h1:/RX0Dki8LKxeAqbbPUsGWJLBHU49okjWM5gQK0CpF/c= +github.com/DataDog/datadog-agent/pkg/proto v0.80.2 h1:Q+ZcqkH3muKjeChRUTRVhcuSPQXYnPMRwgbifjV2p8w= +github.com/DataDog/datadog-agent/pkg/proto v0.80.2/go.mod h1:/sOCbgk2WqWFDxYEd4k7dJVk/F2LGqR3l6OCAB2/IbI= +github.com/DataDog/datadog-agent/pkg/remoteconfig/state v0.80.2 h1:g7KSX8l4uLYcHBuV0DwSly2hpLHidDmc2URsYHC8bhM= +github.com/DataDog/datadog-agent/pkg/remoteconfig/state v0.80.2/go.mod h1:b+X8RabhAJgY7dxWUHaKvB9UgxK32oeK7V1tyYpHVZs= +github.com/DataDog/datadog-agent/pkg/trace v0.80.2 h1:xYHuWy8qEAoCU6XFlxBit0RTNs6Dn2cFZvvw7SWRZy0= 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+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/examples/datadog-logging-and-tracing/main.go b/examples/datadog-logging-and-tracing/main.go new file mode 100644 index 0000000..4d9a38c --- /dev/null +++ b/examples/datadog-logging-and-tracing/main.go @@ -0,0 +1,74 @@ +package main + +import ( + stdlog "log" + "net" + "net/http" + "os" + "time" + + "github.com/rs/zerolog" + ddhttp "gopkg.in/DataDog/dd-trace-go.v1/contrib/net/http" + "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer" + + "github.com/mccutchen/go-httpbin/v2/httpbin" +) + +const ( + readHeaderTimeout = 500 * time.Millisecond + readTimeout = 1 * time.Second +) + +func main() { + tracer.Start() + defer tracer.Stop() + + listenAddr := os.Getenv("LISTEN_ADDR") + if listenAddr == "" { + port := os.Getenv("PORT") + if port == "" { + port = "8080" + } + listenAddr = net.JoinHostPort("", port) + } + + serviceName := os.Getenv("DD_SERVICE") + if serviceName == "" { + serviceName = "go-httpbin" + } + + logger := newLogger() + + var handler http.Handler = httpbin.New() + handler = loggingHandler(logger, handler) + handler = ddhttp.WrapHandler(handler, serviceName, "", ddhttp.WithResourceNamer(func(r *http.Request) string { + return r.Method + " " + r.URL.String() + })) + + srv := &http.Server{ + Handler: handler, + Addr: listenAddr, + ReadHeaderTimeout: readHeaderTimeout, + ReadTimeout: readTimeout, + } + + logger.Info().Msgf("go-httpbin listening on %s", listenAddr) + if err := srv.ListenAndServe(); err != nil { + logger.Error().Err(err).Msg("failed to start server") + os.Exit(1) + } +} + +func newLogger() zerolog.Logger { + // This logging configuration can only be set globally + zerolog.TimestampFieldName = "timestamp" + zerolog.TimeFieldFormat = "2006-01-02T15:04:05.999Z" + + logger := zerolog.New(os.Stderr).With().Timestamp().Logger().Level(zerolog.InfoLevel) + + // Also capture any uses of the global stdlib logger + stdlog.SetFlags(0) + stdlog.SetOutput(logger) + + return logger +} diff --git a/examples/datadog-logging-and-tracing/middleware.go b/examples/datadog-logging-and-tracing/middleware.go new file mode 100644 index 0000000..db4c623 --- /dev/null +++ b/examples/datadog-logging-and-tracing/middleware.go @@ -0,0 +1,87 @@ +package main + +import ( + "net/http" + "strings" + "time" + + "github.com/rs/zerolog" + "github.com/rs/zerolog/hlog" + "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer" +) + +// loggingHandler wraps the given handler with a middleware chain that ensures +// it produces structured logs that can be correlated to APM traces. +func loggingHandler(logger zerolog.Logger, handler http.Handler) http.Handler { + handler = accessLogHandler(handler) + handler = traceContextHandler(handler) + handler = hlog.NewHandler(logger)(handler) + return handler +} + +// accessLogHandler logs each request according to DataDog's standard +// structured logging attributes: +// https://docs.datadoghq.com/logs/processing/attributes_naming_convention/#default-standard-attribute-list +func accessLogHandler(next http.Handler) http.Handler { + return hlog.AccessHandler(func(r *http.Request, status, size int, duration time.Duration) { + lvl := zerolog.InfoLevel + switch { + case status >= 500: + lvl = zerolog.ErrorLevel + case status >= 400: + lvl = zerolog.WarnLevel + } + + hlog.FromRequest(r). + WithLevel(lvl). + Int64("duration", duration.Nanoseconds()). + Str("http.host", r.Host). + Str("http.method", r.Method). + Int("http.status_code", status). + Str("http.url", r.URL.String()). + Str("http.useragent", r.Header.Get("User-Agent")). + Int64("network.bytes_read", r.ContentLength). + Int("network.bytes_written", size). + Str("network.client.ip", getClientIP(r)). + Msgf("%d %s %s (%.1fms)", status, r.Method, r.RequestURI, float64(duration)/float64(time.Millisecond)) + })(next) +} + +// traceContextHandler ensures that dd.trace_id and dd.span_id are added to all +// logging output, so that DataDog will automatically correlate logs to traces. +func traceContextHandler(next http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + // span should be present on all requests via our use of DataDog's + // mux (see main.go) + span, _ := tracer.SpanFromContext(r.Context()) + if span.Context().TraceID() != 0 { + hlog.FromRequest(r).UpdateContext(func(c zerolog.Context) zerolog.Context { + return c. + Uint64("dd.trace_id", span.Context().TraceID()). + Uint64("dd.span_id", span.Context().SpanID()) + }) + } + next.ServeHTTP(w, r) + }) +} + +// getClientIP tries to get a reasonable value for the IP address of the +// client making the request. Copied from httpbin's internals. +func getClientIP(r *http.Request) string { + // Special case some hosting platforms that provide the value directly. + if clientIP := r.Header.Get("Fly-Client-IP"); clientIP != "" { + return clientIP + } + if clientIP := r.Header.Get("CF-Connecting-IP"); clientIP != "" { + return clientIP + } + + // Try to pull a reasonable value from the X-Forwarded-For header, if + // present, by taking the first entry in a comma-separated list of IPs. + if forwardedFor := r.Header.Get("X-Forwarded-For"); forwardedFor != "" { + return strings.TrimSpace(strings.SplitN(forwardedFor, ",", 2)[0]) + } + + // Finally, fall back on the actual remote addr from the request. + return r.RemoteAddr +}