Add OTel distributed tracing to backend, ui, and runner
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Go backend: - Add OTel SDK + otelhttp middleware deps (go.mod) - New internal/otelsetup package: init OTLP/HTTP TracerProvider from env vars - cmd/backend/main.go: call otelsetup.Init() after logger + ctx setup - internal/backend/server.go: wrap mux with otelhttp.NewHandler() before sentryhttp, so all HTTP spans are recorded SvelteKit UI: - Add @opentelemetry/sdk-node, exporter-trace-otlp-http, resources, semantic-conventions - hooks.server.ts: init NodeSDK when OTEL_EXPORTER_OTLP_ENDPOINT is set; graceful shutdown on SIGTERM/SIGINT Config: - docker-compose.yml: pass OTEL_EXPORTER_OTLP_ENDPOINT + OTEL_SERVICE_NAME to backend, runner, and ui services - homelab/docker-compose.yml: fix runner OTel endpoint to HTTP port 4318 - Doppler prd: OTEL_EXPORTER_OTLP_ENDPOINT=https://otel.libnovel.cc - Doppler prd_homelab: OTEL_EXPORTER_OTLP_ENDPOINT=http://otel-collector:4318 All services no-op gracefully when the env var is unset (local dev).
This commit is contained in:
Admin
BIN
backend/backend
Executable file
BIN
backend/backend
Executable file
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@@ -26,6 +26,7 @@ import (
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"github.com/libnovel/backend/internal/config"
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"github.com/libnovel/backend/internal/kokoro"
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"github.com/libnovel/backend/internal/meili"
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"github.com/libnovel/backend/internal/otelsetup"
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"github.com/libnovel/backend/internal/storage"
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)
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@@ -70,6 +71,16 @@ func run() error {
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ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
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defer stop()
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// ── OpenTelemetry tracing ─────────────────────────────────────────────────
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otelShutdown, err := otelsetup.Init(ctx, version)
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if err != nil {
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return fmt.Errorf("init otel: %w", err)
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}
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if otelShutdown != nil {
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defer otelShutdown()
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log.Info("otel tracing enabled", "endpoint", os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT"))
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}
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// ── Storage ──────────────────────────────────────────────────────────────
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store, err := storage.NewStore(ctx, cfg, log)
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if err != nil {
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@@ -9,14 +9,19 @@ require (
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require (
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github.com/andybalholm/brotli v1.1.1 // indirect
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github.com/cenkalti/backoff/v5 v5.0.3 // indirect
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github.com/cespare/xxhash/v2 v2.3.0 // indirect
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github.com/davecgh/go-spew v1.1.1 // indirect
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github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
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github.com/dustin/go-humanize v1.0.1 // indirect
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github.com/felixge/httpsnoop v1.0.4 // indirect
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github.com/getsentry/sentry-go v0.43.0 // indirect
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github.com/go-ini/ini v1.67.0 // indirect
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github.com/go-logr/logr v1.4.3 // indirect
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github.com/go-logr/stdr v1.2.2 // indirect
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github.com/golang-jwt/jwt/v5 v5.3.1 // indirect
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github.com/google/uuid v1.6.0 // indirect
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github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect
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github.com/klauspost/compress v1.18.2 // indirect
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github.com/klauspost/cpuid/v2 v2.2.11 // indirect
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github.com/klauspost/crc32 v1.3.0 // indirect
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@@ -28,10 +33,23 @@ require (
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github.com/redis/go-redis/v9 v9.18.0 // indirect
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github.com/rs/xid v1.6.0 // indirect
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github.com/tinylib/msgp v1.6.1 // indirect
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go.opentelemetry.io/auto/sdk v1.2.1 // indirect
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go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.67.0 // indirect
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go.opentelemetry.io/otel v1.42.0 // indirect
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go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.42.0 // indirect
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go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.42.0 // indirect
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go.opentelemetry.io/otel/metric v1.42.0 // indirect
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go.opentelemetry.io/otel/sdk v1.42.0 // indirect
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go.opentelemetry.io/otel/trace v1.42.0 // indirect
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go.opentelemetry.io/proto/otlp v1.9.0 // indirect
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go.uber.org/atomic v1.11.0 // indirect
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go.yaml.in/yaml/v3 v3.0.4 // indirect
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golang.org/x/crypto v0.48.0 // indirect
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golang.org/x/sys v0.41.0 // indirect
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golang.org/x/text v0.34.0 // indirect
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google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57 // indirect
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google.golang.org/genproto/googleapis/rpc v0.0.0-20260209200024-4cfbd4190f57 // indirect
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google.golang.org/grpc v1.79.2 // indirect
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google.golang.org/protobuf v1.36.11 // indirect
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gopkg.in/yaml.v3 v3.0.1 // indirect
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)
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@@ -1,5 +1,7 @@
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github.com/andybalholm/brotli v1.1.1 h1:PR2pgnyFznKEugtsUo0xLdDop5SKXd5Qf5ysW+7XdTA=
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github.com/andybalholm/brotli v1.1.1/go.mod h1:05ib4cKhjx3OQYUY22hTVd34Bc8upXjOLL2rKwwZBoA=
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github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
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github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
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github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
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github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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@@ -8,14 +10,23 @@ github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/r
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github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
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github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
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github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
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github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
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github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
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github.com/getsentry/sentry-go v0.43.0 h1:XbXLpFicpo8HmBDaInk7dum18G9KSLcjZiyUKS+hLW4=
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github.com/getsentry/sentry-go v0.43.0/go.mod h1:XDotiNZbgf5U8bPDUAfvcFmOnMQQceESxyKaObSssW0=
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github.com/go-ini/ini v1.67.0 h1:z6ZrTEZqSWOTyH2FlglNbNgARyHG8oLW9gMELqKr06A=
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github.com/go-ini/ini v1.67.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
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github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
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github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
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github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
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github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
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github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
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github.com/golang-jwt/jwt/v5 v5.3.1 h1:kYf81DTWFe7t+1VvL7eS+jKFVWaUnK9cB1qbwn63YCY=
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github.com/golang-jwt/jwt/v5 v5.3.1/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
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github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
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github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 h1:HWRh5R2+9EifMyIHV7ZV+MIZqgz+PMpZ14Jynv3O2Zs=
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github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0/go.mod h1:JfhWUomR1baixubs02l85lZYYOm7LV6om4ceouMv45c=
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github.com/klauspost/compress v1.18.2 h1:iiPHWW0YrcFgpBYhsA6D1+fqHssJscY/Tm/y2Uqnapk=
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github.com/klauspost/compress v1.18.2/go.mod h1:R0h/fSBs8DE4ENlcrlib3PsXS61voFxhIs2DeRhCvJ4=
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github.com/klauspost/cpuid/v2 v2.0.1/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
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@@ -45,6 +56,24 @@ github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu
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github.com/tinylib/msgp v1.6.1 h1:ESRv8eL3u+DNHUoSAAQRE50Hm162zqAnBoGv9PzScPY=
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github.com/tinylib/msgp v1.6.1/go.mod h1:RSp0LW9oSxFut3KzESt5Voq4GVWyS+PSulT77roAqEA=
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github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
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go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
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go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
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go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.67.0 h1:OyrsyzuttWTSur2qN/Lm0m2a8yqyIjUVBZcxFPuXq2o=
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go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.67.0/go.mod h1:C2NGBr+kAB4bk3xtMXfZ94gqFDtg/GkI7e9zqGh5Beg=
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go.opentelemetry.io/otel v1.42.0 h1:lSQGzTgVR3+sgJDAU/7/ZMjN9Z+vUip7leaqBKy4sho=
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go.opentelemetry.io/otel v1.42.0/go.mod h1:lJNsdRMxCUIWuMlVJWzecSMuNjE7dOYyWlqOXWkdqCc=
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go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.42.0 h1:THuZiwpQZuHPul65w4WcwEnkX2QIuMT+UFoOrygtoJw=
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go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.42.0/go.mod h1:J2pvYM5NGHofZ2/Ru6zw/TNWnEQp5crgyDeSrYpXkAw=
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go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.42.0 h1:uLXP+3mghfMf7XmV4PkGfFhFKuNWoCvvx5wP/wOXo0o=
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go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.42.0/go.mod h1:v0Tj04armyT59mnURNUJf7RCKcKzq+lgJs6QSjHjaTc=
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go.opentelemetry.io/otel/metric v1.42.0 h1:2jXG+3oZLNXEPfNmnpxKDeZsFI5o4J+nz6xUlaFdF/4=
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go.opentelemetry.io/otel/metric v1.42.0/go.mod h1:RlUN/7vTU7Ao/diDkEpQpnz3/92J9ko05BIwxYa2SSI=
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go.opentelemetry.io/otel/sdk v1.42.0 h1:LyC8+jqk6UJwdrI/8VydAq/hvkFKNHZVIWuslJXYsDo=
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go.opentelemetry.io/otel/sdk v1.42.0/go.mod h1:rGHCAxd9DAph0joO4W6OPwxjNTYWghRWmkHuGbayMts=
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go.opentelemetry.io/otel/trace v1.42.0 h1:OUCgIPt+mzOnaUTpOQcBiM/PLQ/Op7oq6g4LenLmOYY=
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go.opentelemetry.io/otel/trace v1.42.0/go.mod h1:f3K9S+IFqnumBkKhRJMeaZeNk9epyhnCmQh/EysQCdc=
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go.opentelemetry.io/proto/otlp v1.9.0 h1:l706jCMITVouPOqEnii2fIAuO3IVGBRPV5ICjceRb/A=
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go.opentelemetry.io/proto/otlp v1.9.0/go.mod h1:xE+Cx5E/eEHw+ISFkwPLwCZefwVjY+pqKg1qcK03+/4=
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go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
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go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
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go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
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@@ -57,6 +86,14 @@ golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
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golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
|
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golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
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golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=
|
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google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57 h1:JLQynH/LBHfCTSbDWl+py8C+Rg/k1OVH3xfcaiANuF0=
|
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google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57/go.mod h1:kSJwQxqmFXeo79zOmbrALdflXQeAYcUbgS7PbpMknCY=
|
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google.golang.org/genproto/googleapis/rpc v0.0.0-20260209200024-4cfbd4190f57 h1:mWPCjDEyshlQYzBpMNHaEof6UX1PmHcaUODUywQ0uac=
|
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google.golang.org/genproto/googleapis/rpc v0.0.0-20260209200024-4cfbd4190f57/go.mod h1:j9x/tPzZkyxcgEFkiKEEGxfvyumM01BEtsW8xzOahRQ=
|
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google.golang.org/grpc v1.79.2 h1:fRMD94s2tITpyJGtBBn7MkMseNpOZU8ZxgC3MMBaXRU=
|
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google.golang.org/grpc v1.79.2/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhHLrHQ=
|
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google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
|
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google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
|
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
|
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
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gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
|
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|
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@@ -33,6 +33,7 @@ import (
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"github.com/libnovel/backend/internal/kokoro"
|
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"github.com/libnovel/backend/internal/meili"
|
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"github.com/libnovel/backend/internal/taskqueue"
|
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"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
|
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)
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// Dependencies holds all external services the backend server depends on.
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@@ -170,9 +171,17 @@ func (s *Server) ListenAndServe(ctx context.Context) error {
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mux.HandleFunc("POST /api/progress/{slug}", s.handleSetProgress)
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mux.HandleFunc("DELETE /api/progress/{slug}", s.handleDeleteProgress)
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// Wrap mux with OTel tracing (no-op when no TracerProvider is set),
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// then with Sentry for panic recovery and error reporting.
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var handler http.Handler = mux
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handler = otelhttp.NewHandler(handler, "libnovel.backend",
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otelhttp.WithMessageEvents(otelhttp.ReadEvents, otelhttp.WriteEvents),
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)
|
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handler = sentryhttp.New(sentryhttp.Options{Repanic: true}).Handle(handler)
|
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|
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srv := &http.Server{
|
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Addr: s.cfg.Addr,
|
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Handler: sentryhttp.New(sentryhttp.Options{Repanic: true}).Handle(mux),
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Handler: handler,
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ReadTimeout: 15 * time.Second,
|
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WriteTimeout: 60 * time.Second,
|
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IdleTimeout: 60 * time.Second,
|
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|
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74
backend/internal/otelsetup/otelsetup.go
Normal file
74
backend/internal/otelsetup/otelsetup.go
Normal file
@@ -0,0 +1,74 @@
|
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// Package otelsetup initialises the OpenTelemetry SDK for the LibNovel backend.
|
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//
|
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// It reads two environment variables:
|
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//
|
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// OTEL_EXPORTER_OTLP_ENDPOINT — OTLP/HTTP endpoint, e.g. http://otel-collector:4318
|
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// OTEL_SERVICE_NAME — service name reported in traces (default: "backend")
|
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//
|
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// When OTEL_EXPORTER_OTLP_ENDPOINT is empty the function is a no-op and
|
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// returns a nil shutdown func, so the caller never needs to branch on it.
|
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//
|
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// Usage in main.go:
|
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//
|
||||
// shutdown, err := otelsetup.Init(ctx, version)
|
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// if err != nil { return err }
|
||||
// if shutdown != nil { defer shutdown() }
|
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package otelsetup
|
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|
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import (
|
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"context"
|
||||
"fmt"
|
||||
"os"
|
||||
"time"
|
||||
|
||||
"go.opentelemetry.io/otel"
|
||||
"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"
|
||||
)
|
||||
|
||||
// Init sets up a TracerProvider that exports spans via OTLP/HTTP.
|
||||
// Returns a shutdown function (or nil if OTel is disabled) and any error.
|
||||
func Init(ctx context.Context, version string) (shutdown func(), err error) {
|
||||
endpoint := os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT")
|
||||
if endpoint == "" {
|
||||
return nil, nil // OTel disabled — not an error
|
||||
}
|
||||
|
||||
serviceName := os.Getenv("OTEL_SERVICE_NAME")
|
||||
if serviceName == "" {
|
||||
serviceName = "backend"
|
||||
}
|
||||
|
||||
exp, err := otlptracehttp.New(ctx,
|
||||
otlptracehttp.WithEndpoint(endpoint),
|
||||
otlptracehttp.WithInsecure(), // collector is on the internal Docker network
|
||||
)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("otelsetup: create OTLP exporter: %w", err)
|
||||
}
|
||||
|
||||
res, err := resource.New(ctx,
|
||||
resource.WithAttributes(
|
||||
semconv.ServiceName(serviceName),
|
||||
semconv.ServiceVersion(version),
|
||||
),
|
||||
)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("otelsetup: create resource: %w", err)
|
||||
}
|
||||
|
||||
tp := sdktrace.NewTracerProvider(
|
||||
sdktrace.WithBatcher(exp),
|
||||
sdktrace.WithResource(res),
|
||||
sdktrace.WithSampler(sdktrace.ParentBased(sdktrace.TraceIDRatioBased(0.2))),
|
||||
)
|
||||
otel.SetTracerProvider(tp)
|
||||
|
||||
return func() {
|
||||
shutCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
||||
defer cancel()
|
||||
_ = tp.Shutdown(shutCtx)
|
||||
}, nil
|
||||
}
|
||||
Reference in New Issue
Block a user