feat(tracing): Misc. OTel tracing improvements

Signed-off-by: Dave Henderson <[email protected]>

cmd/relayproxy/api/opentelemetry/otel.go

@@ -2,68 +2,166 @@ package opentelemetry
 
 import (
  "context"
- "net/url"
+ "fmt"
+ "os"
+ "strconv"
+ "time"
 
  "github.com/thomaspoignant/go-feature-flag/cmd/relayproxy/config"
+ "go.opentelemetry.io/contrib/exporters/autoexport"
+ "go.opentelemetry.io/contrib/samplers/jaegerremote"
  "go.opentelemetry.io/otel"
- "go.opentelemetry.io/otel/attribute"
- "go.opentelemetry.io/otel/exporters/otlp/otlptrace"
- "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
  "go.opentelemetry.io/otel/sdk/resource"
  sdktrace "go.opentelemetry.io/otel/sdk/trace"
+ semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
+ "go.uber.org/zap"
 )
 
 type OtelService struct {
  otelTraceProvider *sdktrace.TracerProvider
- otelExporter *otlptrace.Exporter
+ otelExporter sdktrace.SpanExporter
 }
 
 func NewOtelService() OtelService {
  return OtelService{}
 }
 
 // Init the OpenTelemetry service
-func (s *OtelService) Init(ctx context.Context, config config.Config) error {
- // parsing the OpenTelemetry endpoint
- u, err := url.Parse(config.OpenTelemetryOtlpEndpoint)
+func (s *OtelService) Init(ctx context.Context, zapLog *zap.Logger, config *config.Config) error {
+ // OTEL_SDK_DISABLED is not supported by the Go SDK, but is a standard env
+ // var defined by the OTel spec. We'll use it to disable the trace provider.
+ if disabled, _ := strconv.ParseBool(os.Getenv("OTEL_SDK_DISABLED")); disabled {
+ return nil
+ }
+
+ // support the openTelemetryOtlpEndpoint config element
+ if config.OpenTelemetryOtlpEndpoint != "" &&
+ os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT") == "" {
+ os.Setenv("OTEL_EXPORTER_OTLP_ENDPOINT", config.OpenTelemetryOtlpEndpoint)
+ }
+
+ exporter, err := autoexport.NewSpanExporter(ctx)
  if err != nil {
- return err
+ return fmt.Errorf("initializing OTel exporter: %w", err)
  }
 
- var opts []otlptracehttp.Option
- if u.Scheme == "http" {
- opts = append(opts, otlptracehttp.WithInsecure())
+ serviceName := "go-feature-flag"
+ if v := os.Getenv("OTEL_SERVICE_NAME"); v != "" {
+ serviceName = v
  }
- opts = append(opts, otlptracehttp.WithEndpoint(u.Host))
- client := otlptracehttp.NewClient(opts...)
 
- s.otelExporter, err = otlptrace.New(ctx, client)
+ sampler, err := initSampler(serviceName)
+ if err != nil {
+ return fmt.Errorf("initializing OTel sampler: %w", err)
+ }
+
+ resource, err := resource.New(ctx,
+ resource.WithFromEnv(),
+ resource.WithProcessPID(),
+ resource.WithProcessExecutableName(),
+ resource.WithProcessExecutablePath(),
+ resource.WithProcessOwner(),
+ resource.WithProcessRuntimeName(),
+ resource.WithProcessRuntimeVersion(),
+ resource.WithProcessRuntimeDescription(),
+ resource.WithHost(),
+ resource.WithTelemetrySDK(),
+ resource.WithOS(),
+ resource.WithContainer(),
+ resource.WithAttributes(
+ semconv.ServiceNameKey.String(serviceName),
+ semconv.ServiceVersionKey.String(config.Version),
+ ),
+ )
  if err != nil {
- return err
+ return fmt.Errorf("initializing OTel resources: %w", err)
  }
 
+ s.otelExporter = exporter
  s.otelTraceProvider = sdktrace.NewTracerProvider(
- sdktrace.WithSampler(sdktrace.AlwaysSample()),
- sdktrace.WithBatcher(s.otelExporter),
- sdktrace.WithResource(resource.NewSchemaless(
- attribute.String("service.name", "go-feature-flag"),
- attribute.String("service.version", config.Version),
- )),
+ sdktrace.WithBatcher(exporter),
+ sdktrace.WithSampler(sampler),
+ sdktrace.WithResource(resource),
  )
+
  otel.SetTracerProvider(s.otelTraceProvider)
+
+ // log OTel errors to zap rather than the default log package
+ otel.SetErrorHandler(otelErrHandler(func(err error) {
+ zapLog.Error("OTel error", zap.Error(err))
+ }))
+
  return nil
 }
 
+type otelErrHandler func(err error)
+
+func (o otelErrHandler) Handle(err error) {
+ o(err)
+}
+
+var _ otel.ErrorHandler = otelErrHandler(nil)
+
+// initSampler determines which sampling strategy to use. If OTEL_TRACES_SAMPLER
+// is unset, we'll always sample.
+// If it's set to jaeger_remote, we'll use the Jaeger sampling server (supports
+// JAEGER_SAMPLER_MANAGER_HOST_PORT, JAEGER_SAMPLER_REFRESH_INTERVAL, and
+// JAEGER_SAMPLER_MAX_OPERATIONS).
+// If it's set to any other value, we return nil and sdktrace.NewTracerProvider
+// will set up the initSampler from the environment.
+func initSampler(serviceName string) (sdktrace.Sampler, error) {
+ sampler, ok := os.LookupEnv("OTEL_TRACES_SAMPLER")
+ if !ok {
+ return sdktrace.AlwaysSample(), nil
+ }
+
+ if sampler != "jaeger_remote" {
+ return nil, nil
+ }
+
+ samplerURL := "http://localhost:5778/sampling"
+ if v := os.Getenv("JAEGER_SAMPLER_MANAGER_HOST_PORT"); v != "" {
+ samplerURL = v
+ }
+
+ samplerRefreshInterval := 1 * time.Minute
+ if v := os.Getenv("JAEGER_SAMPLER_REFRESH_INTERVAL"); v != "" {
+ d, err := time.ParseDuration(v)
+ if err != nil {
+ return nil, fmt.Errorf("parsing JAEGER_SAMPLER_REFRESH_INTERVAL: %w", err)
+ }
+ samplerRefreshInterval = d
+ }
+
+ maxOperations := 256
+ if v := os.Getenv("JAEGER_SAMPLER_MAX_OPERATIONS"); v != "" {
+ i, err := strconv.Atoi(v)
+ if err != nil {
+ return nil, fmt.Errorf("parsing JAEGER_SAMPLER_MAX_OPERATIONS: %w", err)
+ }
+ maxOperations = i
+ }
+
+ return jaegerremote.New(
+ serviceName,
+ jaegerremote.WithSamplingServerURL(samplerURL),
+ jaegerremote.WithSamplingRefreshInterval(samplerRefreshInterval),
+ jaegerremote.WithMaxOperations(maxOperations),
+ jaegerremote.WithInitialSampler(sdktrace.AlwaysSample()),
+ ), nil
+}
+
 // Stop the OpenTelemetry service
-func (s *OtelService) Stop() error {
+func (s *OtelService) Stop(ctx context.Context) error {
  if s.otelExporter != nil {
- err := s.otelExporter.Shutdown(context.Background())
+ err := s.otelExporter.Shutdown(ctx)
  if err != nil {
  return err
  }
  }
+
  if s.otelTraceProvider != nil {
- err := s.otelTraceProvider.Shutdown(context.Background())
+ err := s.otelTraceProvider.Shutdown(ctx)
  if err != nil {
  return err
  }

cmd/relayproxy/api/server.go

@@ -119,7 +119,7 @@ func (s *Server) Start() {
  }
 
  // start the OpenTelemetry tracing service
- err := s.otelService.Init(context.Background(), *s.config)
+ err := s.otelService.Init(context.Background(), s.zapLog, s.config)
  if err != nil {
  s.zapLog.Error("error while initializing Otel", zap.Error(err))
  // we can continue because otel is not mandatory to start the server
@@ -148,8 +148,8 @@ func (s *Server) StartAwsLambda() {
 }
 
 // Stop shutdown the API server
-func (s *Server) Stop() {
- err := s.otelService.Stop()
+func (s *Server) Stop(ctx context.Context) {
+ err := s.otelService.Stop(ctx)
  if err != nil {
  s.zapLog.Error("impossible to stop otel", zap.Error(err))
  }

cmd/relayproxy/api/server_test.go

@@ -1,6 +1,7 @@
 package api_test
 
 import (
+ "context"
  "net/http"
  "strings"
  "testing"
@@ -52,7 +53,7 @@ func Test_Starting_RelayProxy_with_monitoring_on_same_port(t *testing.T) {
 
  s := api.New(proxyConf, services, log.ZapLogger)
  go func() { s.Start() }()
- defer s.Stop()
+ defer s.Stop(context.Background())
 
  time.Sleep(10 * time.Millisecond)
 
@@ -106,7 +107,7 @@ func Test_Starting_RelayProxy_with_monitoring_on_different_port(t *testing.T) {
 
  s := api.New(proxyConf, services, log.ZapLogger)
  go func() { s.Start() }()
- defer s.Stop()
+ defer s.Stop(context.Background())
 
  time.Sleep(10 * time.Millisecond)
 
@@ -175,7 +176,7 @@ func Test_CheckOFREPAPIExists(t *testing.T) {
 
  s := api.New(proxyConf, services, log.ZapLogger)
  go func() { s.Start() }()
- defer s.Stop()
+ defer s.Stop(context.Background())
 
  time.Sleep(10 * time.Millisecond)
 

cmd/relayproxy/main.go

@@ -1,8 +1,10 @@
 package main
 
 import (
+ "context"
  "fmt"
  "os"
+ "time"
 
  "github.com/spf13/pflag"
  "github.com/thomaspoignant/go-feature-flag/cmd/relayproxy/api"
@@ -100,7 +102,11 @@ func main() {
  if proxyConf.StartAsAwsLambda {
  apiServer.StartAwsLambda()
  } else {
+ defer func() {
+ ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+ defer cancel()
+ apiServer.Stop(ctx)
+ }()
  apiServer.Start()
- defer func() { _ = apiServer.Stop }()
  }
 }

go.mod

@@ -50,10 +50,10 @@ require (
  github.com/xitongsys/parquet-go v1.6.2
  github.com/xitongsys/parquet-go-source v0.0.0-20230830030807-0dd610dbff1d
  go.mongodb.org/mongo-driver v1.17.1
+ go.opentelemetry.io/contrib/exporters/autoexport v0.55.0
  go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho v0.55.0
+ go.opentelemetry.io/contrib/samplers/jaegerremote v0.24.0
  go.opentelemetry.io/otel v1.30.0
- go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.30.0
- go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.30.0
  go.opentelemetry.io/otel/sdk v1.30.0
  go.uber.org/zap v1.27.0
  golang.org/x/net v0.30.0
@@ -191,7 +191,7 @@ require (
  github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
  github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
  github.com/prometheus/client_model v0.6.1 // indirect
- github.com/prometheus/common v0.55.0 // indirect
+ github.com/prometheus/common v0.59.1 // indirect
  github.com/prometheus/procfs v0.15.1 // indirect
  github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect
  github.com/samber/lo v1.44.0 // indirect
@@ -215,11 +215,25 @@ require (
  github.com/yusufpapurcu/wmi v1.2.3 // indirect
  go.einride.tech/aip v0.68.0 // indirect
  go.opencensus.io v0.24.0 // indirect
+ go.opentelemetry.io/contrib/bridges/prometheus v0.55.0 // indirect
  go.opentelemetry.io/contrib/detectors/gcp v1.29.0 // indirect
  go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.54.0 // indirect
  go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.54.0 // indirect
+ go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.6.0 // indirect
+ go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.6.0 // indirect
+ go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.30.0 // indirect
+ go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.30.0 // indirect
+ go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.30.0 // indirect
+ go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.30.0 // indirect
+ go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.30.0 // indirect
+ go.opentelemetry.io/otel/exporters/prometheus v0.52.0 // indirect
+ go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.6.0 // indirect
+ go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.30.0 // indirect
+ go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.30.0 // indirect
+ go.opentelemetry.io/otel/log v0.6.0 // indirect
  go.opentelemetry.io/otel/metric v1.30.0 // indirect
- go.opentelemetry.io/otel/sdk/metric v1.29.0 // indirect
+ go.opentelemetry.io/otel/sdk/log v0.6.0 // indirect
+ go.opentelemetry.io/otel/sdk/metric v1.30.0 // indirect
  go.opentelemetry.io/otel/trace v1.30.0 // indirect
  go.opentelemetry.io/proto/otlp v1.3.1 // indirect
  go.uber.org/multierr v1.11.0 // indirect

go.sum

@@ -792,8 +792,8 @@ github.com/prometheus/client_golang v1.20.4/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/j
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
 github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
-github.com/prometheus/common v0.55.0 h1:KEi6DK7lXW/m7Ig5i47x0vRzuBsHuvJdi5ee6Y3G1dc=
-github.com/prometheus/common v0.55.0/go.mod h1:2SECS4xJG1kd8XF9IcM1gMX6510RAEL65zxzNImwdc8=
+github.com/prometheus/common v0.59.1 h1:LXb1quJHWm1P6wq/U824uxYi4Sg0oGvNeUm1z5dJoX0=
+github.com/prometheus/common v0.59.1/go.mod h1:GpWM7dewqmVYcd7SmRaiWVe9SSqjf0UrwnYnpEZNuT0=
 github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
 github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
 github.com/r3labs/diff/v3 v3.0.1 h1:CBKqf3XmNRHXKmdU7mZP1w7TV0pDyVCis1AUHtA4Xtg=
@@ -925,8 +925,12 @@ go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
 go.opencensus.io v0.24.0 h1:y73uSU6J157QMP2kn2r30vwW1A2W2WFwSCGnAVxeaD0=
 go.opencensus.io v0.24.0/go.mod h1:vNK8G9p7aAivkbmorf4v+7Hgx+Zs0yY+0fOtgBfjQKo=
+go.opentelemetry.io/contrib/bridges/prometheus v0.55.0 h1:1oZYcP3wuazG3O1563m8cs5vc/pBMTymRwgG9yvxMm8=
+go.opentelemetry.io/contrib/bridges/prometheus v0.55.0/go.mod h1:sU48aWFqiqBXo2RBtq7KarczkW8uK6RdIU54y4VzpZs=
 go.opentelemetry.io/contrib/detectors/gcp v1.29.0 h1:TiaiXB4DpGD3sdzNlYQxruQngn5Apwzi1X0DRhuGvDQ=
 go.opentelemetry.io/contrib/detectors/gcp v1.29.0/go.mod h1:GW2aWZNwR2ZxDLdv8OyC2G8zkRoQBuURgV7RPQgcPoU=
+go.opentelemetry.io/contrib/exporters/autoexport v0.55.0 h1:8kNP8SX9id5TY2feLB+79aFxE0kqzh3KvjF1nAfGxVM=
+go.opentelemetry.io/contrib/exporters/autoexport v0.55.0/go.mod h1:WhcvzeuTOr58aYsJ7S4ubY1xMs0WXAPaqTQnxr8bRHk=
 go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho v0.55.0 h1:dJfUeXRQiU+7IhOeqXV7f1hJA47cCOBmCY8uyygIEZg=
 go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho v0.55.0/go.mod h1:Uk7Flfuk5HGTeggDwlwanunnSDcJydFRihfXT1Z5fEs=
 go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.54.0 h1:r6I7RJCN86bpD/FQwedZ0vSixDpwuWREjW9oRMsmqDc=
@@ -935,18 +939,42 @@ go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.54.0 h1:TT4fX+n
 go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.54.0/go.mod h1:L7UH0GbB0p47T4Rri3uHjbpCFYrVrwc1I25QhNPiGK8=
 go.opentelemetry.io/contrib/propagators/b3 v1.30.0 h1:vumy4r1KMyaoQRltX7cJ37p3nluzALX9nugCjNNefuY=
 go.opentelemetry.io/contrib/propagators/b3 v1.30.0/go.mod h1:fRbvRsaeVZ82LIl3u0rIvusIel2UUf+JcaaIpy5taho=
+go.opentelemetry.io/contrib/samplers/jaegerremote v0.24.0 h1:LcynmmCFYwa0AySFI+yLEeZpwQi2yQdEkv5+zA3TwcI=
+go.opentelemetry.io/contrib/samplers/jaegerremote v0.24.0/go.mod h1:oPzwx3Gp7+u62wvez470Yq/Yu0O7hpVl5SFBRGI4964=
 go.opentelemetry.io/otel v1.30.0 h1:F2t8sK4qf1fAmY9ua4ohFS/K+FUuOPemHUIXHtktrts=
 go.opentelemetry.io/otel v1.30.0/go.mod h1:tFw4Br9b7fOS+uEao81PJjVMjW/5fvNCbpsDIXqP0pc=
+go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.6.0 h1:WYsDPt0fM4KZaMhLvY+x6TVXd85P/KNl3Ez3t+0+kGs=
+go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.6.0/go.mod h1:vfY4arMmvljeXPNJOE0idEwuoPMjAPCWmBMmj6R5Ksw=
+go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.6.0 h1:QSKmLBzbFULSyHzOdO9JsN9lpE4zkrz1byYGmJecdVE=
+go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.6.0/go.mod h1:sTQ/NH8Yrirf0sJ5rWqVu+oT82i4zL9FaF6rWcqnptM=
+go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.30.0 h1:WypxHH02KX2poqqbaadmkMYalGyy/vil4HE4PM4nRJc=
+go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.30.0/go.mod h1:U79SV99vtvGSEBeeHnpgGJfTsnsdkWLpPN/CcHAzBSI=
+go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.30.0 h1:VrMAbeJz4gnVDg2zEzjHG4dEH86j4jO6VYB+NgtGD8s=
+go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.30.0/go.mod h1:qqN/uFdpeitTvm+JDqqnjm517pmQRYxTORbETHq5tOc=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.30.0 h1:lsInsfvhVIfOI6qHVyysXMNDnjO9Npvl7tlDPJFBVd4=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.30.0/go.mod h1:KQsVNh4OjgjTG0G6EiNi1jVpnaeeKsKMRwbLN+f1+8M=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.30.0 h1:m0yTiGDLUvVYaTFbAvCkVYIYcvwKt3G7OLoN77NUs/8=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.30.0/go.mod h1:wBQbT4UekBfegL2nx0Xk1vBcnzyBPsIVm9hRG4fYcr4=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.30.0 h1:umZgi92IyxfXd/l4kaDhnKgY8rnN/cZcF1LKc6I8OQ8=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.30.0/go.mod h1:4lVs6obhSVRb1EW5FhOuBTyiQhtRtAnnva9vD3yRfq8=
+go.opentelemetry.io/otel/exporters/prometheus v0.52.0 h1:kmU3H0b9ufFSi8IQCcxack+sWUblKkFbqWYs6YiACGQ=
+go.opentelemetry.io/otel/exporters/prometheus v0.52.0/go.mod h1:+wsAp2+JhuGXX7YRkjlkx6hyWY3ogFPfNA4x3nyiAh0=
+go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.6.0 h1:bZHOb8k/CwwSt0DgvgaoOhBXWNdWqFWaIsGTtg1H3KE=
+go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.6.0/go.mod h1:XlV163j81kDdIt5b5BXCjdqVfqJFy/LJrHA697SorvQ=
+go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.30.0 h1:IyFlqNsi8VT/nwYlLJfdM0y1gavxGpEvnf6FtVfZ6X4=
+go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.30.0/go.mod h1:bxiX8eUeKoAEQmbq/ecUT8UqZwCjZW52yJrXJUSozsk=
+go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.30.0 h1:kn1BudCgwtE7PxLqcZkErpD8GKqLZ6BSzeW9QihQJeM=
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