From 26a8e5b4451644d407ee27c59af42ec20929924c Mon Sep 17 00:00:00 2001 From: Will McCutchen Date: Thu, 12 Oct 2023 17:24:32 -0400 Subject: [PATCH] Add example demonstrating deeper DataDog integration --- .../datadog-logging-and-tracing/README.md | 4 + examples/datadog-logging-and-tracing/go.mod | 43 ++++ examples/datadog-logging-and-tracing/go.sum | 183 ++++++++++++++++++ examples/datadog-logging-and-tracing/main.go | 68 +++++++ .../datadog-logging-and-tracing/middleware.go | 91 +++++++++ 5 files changed, 389 insertions(+) create mode 100644 examples/datadog-logging-and-tracing/README.md create mode 100644 examples/datadog-logging-and-tracing/go.mod create mode 100644 examples/datadog-logging-and-tracing/go.sum create mode 100644 examples/datadog-logging-and-tracing/main.go create mode 100644 examples/datadog-logging-and-tracing/middleware.go diff --git a/examples/datadog-logging-and-tracing/README.md b/examples/datadog-logging-and-tracing/README.md new file mode 100644 index 00000000..f624ed2b --- /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 00000000..63a2d40e --- /dev/null +++ b/examples/datadog-logging-and-tracing/go.mod @@ -0,0 +1,43 @@ +module github.com/mccutchen/go-httpbin/examples/datadog-logging-and-tracing + +go 1.19 + +require ( + github.com/mccutchen/go-httpbin/v2 v2.11.1 + github.com/rs/zerolog v1.31.0 + gopkg.in/DataDog/dd-trace-go.v1 v1.55.0 +) + +require ( + github.com/DataDog/appsec-internal-go v1.0.0 // indirect + github.com/DataDog/datadog-agent/pkg/obfuscate v0.46.0 // indirect + github.com/DataDog/datadog-agent/pkg/remoteconfig/state v0.48.0-devel.0.20230725154044-2549ba9058df // indirect + github.com/DataDog/datadog-go/v5 v5.3.0 // indirect + github.com/DataDog/go-libddwaf v1.5.0 // indirect + github.com/DataDog/go-tuf v1.0.2-0.5.2 // indirect + github.com/DataDog/sketches-go v1.4.2 // indirect + github.com/Microsoft/go-winio v0.6.1 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/dustin/go-humanize v1.0.1 // indirect + github.com/ebitengine/purego v0.5.0-alpha.1 // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/mattn/go-colorable v0.1.13 // indirect + github.com/mattn/go-isatty v0.0.19 // indirect + github.com/outcaste-io/ristretto v0.2.3 // indirect + github.com/philhofer/fwd v1.1.2 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/rs/xid v1.5.0 // indirect + github.com/secure-systems-lab/go-securesystemslib v0.7.0 // indirect + github.com/tinylib/msgp v1.1.8 // indirect + go.uber.org/atomic v1.11.0 // indirect + go4.org/intern v0.0.0-20230525184215-6c62f75575cb // indirect + go4.org/unsafe/assume-no-moving-gc v0.0.0-20230525183740-e7c30c78aeb2 // indirect + golang.org/x/mod v0.12.0 // indirect + golang.org/x/sys v0.12.0 // indirect + golang.org/x/time v0.3.0 // indirect + golang.org/x/tools v0.12.1-0.20230815132531-74c255bcf846 // indirect + golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect + google.golang.org/protobuf v1.30.0 // indirect + inet.af/netaddr v0.0.0-20230525184311-b8eac61e914a // indirect +) diff --git a/examples/datadog-logging-and-tracing/go.sum b/examples/datadog-logging-and-tracing/go.sum new file mode 100644 index 00000000..a265b83e --- /dev/null +++ b/examples/datadog-logging-and-tracing/go.sum @@ -0,0 +1,183 @@ +github.com/DataDog/appsec-internal-go v1.0.0 h1:2u5IkF4DBj3KVeQn5Vg2vjPUtt513zxEYglcqnd500U= +github.com/DataDog/appsec-internal-go v1.0.0/go.mod h1:+Y+4klVWKPOnZx6XESG7QHydOaUGEXyH2j/vSg9JiNM= +github.com/DataDog/datadog-agent/pkg/obfuscate v0.46.0 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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= +inet.af/netaddr v0.0.0-20230525184311-b8eac61e914a h1:1XCVEdxrvL6c0TGOhecLuB7U9zYNdxZEjvOqJreKZiM= +inet.af/netaddr v0.0.0-20230525184311-b8eac61e914a/go.mod h1:e83i32mAQOW1LAqEIweALsuK2Uw4mhQadA5r7b0Wobo= diff --git a/examples/datadog-logging-and-tracing/main.go b/examples/datadog-logging-and-tracing/main.go new file mode 100644 index 00000000..cd0a828e --- /dev/null +++ b/examples/datadog-logging-and-tracing/main.go @@ -0,0 +1,68 @@ +package main + +import ( + stdlog "log" + "net" + "net/http" + "os" + "time" + + 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" + "github.com/rs/zerolog" +) + +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) + } + + app := httpbin.New() + mux := ddhttp.NewServeMux() + mux.Handle("/", app) + + logger := newLogger() + handler := loggingHandler(logger, mux) + + 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 00000000..d95278a8 --- /dev/null +++ b/examples/datadog-logging-and-tracing/middleware.go @@ -0,0 +1,91 @@ +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()). + Dict("http", zerolog.Dict(). + Str("host", r.Host). + Str("method", r.Method). + Int("status_code", status). + Str("url", r.URL.String()). + Str("useragent", r.Header.Get("User-Agent"))). + Dict("network", zerolog.Dict(). + Int64("bytes_read", r.ContentLength). + Int("bytes_written", size). + Dict("client", zerolog.Dict(). + Str("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.Dict("dd", zerolog.Dict(). + Uint64("trace_id", span.Context().TraceID()). + Uint64("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 +}