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wire.go
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wire.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package tracing
import (
"context"
"errors"
"flag"
"fmt"
"net/http"
"sync"
"time"
"github.com/google/uuid"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
t "go.opentelemetry.io/otel/trace"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/go/core"
)
var (
tracingShutdownTimeout = flag.Duration("tracing_shutdown_timeout", 5*time.Second, "How long to wait for the tracer to shutdown.")
global struct {
mu sync.Mutex
initialized bool
exporters []trace.SpanExporter
tracerProvider t.TracerProvider // We don't use otel's global, to ensure that dependency order is respected.
}
propagators = propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})
)
type Exporter struct {
name string
}
func (e Exporter) Register(exp trace.SpanExporter) error {
global.mu.Lock()
defer global.mu.Unlock()
if global.initialized {
return errors.New("Exporter.Register after initialization was complete")
}
global.exporters = append(global.exporters, exp)
return nil
}
func ProvideExporter(_ context.Context, args *ExporterArgs, _ ExtensionDeps) (Exporter, error) {
return Exporter{args.Name}, nil
}
func Prepare(ctx context.Context, deps ExtensionDeps) error {
var opts []trace.TracerProviderOption
exporters := consumeExporters()
if len(exporters) == 0 {
return nil
}
for _, exp := range exporters {
if core.EnvIs(schema.Environment_PRODUCTION) {
opts = append(opts, trace.WithBatcher(exp, trace.WithBatchTimeout(10*time.Second)))
} else {
opts = append(opts, trace.WithSyncer(exp))
}
}
serverResources := core.ServerResourcesFrom(ctx)
// XXX use pod name
instanceID := uuid.NewString()
resource, err :=
resource.New(ctx,
resource.WithSchemaURL(semconv.SchemaURL),
resource.WithOS(),
resource.WithProcessRuntimeName(),
resource.WithProcessRuntimeVersion(),
resource.WithProcessRuntimeDescription(),
resource.WithAttributes(
semconv.ServiceNameKey.String(deps.ServerInfo.ServerName),
semconv.ServiceVersionKey.String(deps.ServerInfo.GetVcs().GetRevision()),
semconv.ServiceInstanceIDKey.String(instanceID),
semconv.DeploymentEnvironmentKey.String(deps.ServerInfo.EnvName),
attribute.String("environment", deps.ServerInfo.EnvName),
),
)
if err != nil {
return fmt.Errorf("failed to create resource: %w", err)
}
opts = append(opts, trace.WithResource(resource))
provider := trace.NewTracerProvider(opts...)
serverResources.Add(close{provider})
deps.Interceptors.ForServer(
otelgrpc.UnaryServerInterceptor(otelgrpc.WithTracerProvider(provider), otelgrpc.WithPropagators(propagators)),
otelgrpc.StreamServerInterceptor(otelgrpc.WithTracerProvider(provider), otelgrpc.WithPropagators(propagators)))
deps.Interceptors.ForClient(
otelgrpc.UnaryClientInterceptor(otelgrpc.WithTracerProvider(provider), otelgrpc.WithPropagators(propagators)),
otelgrpc.StreamClientInterceptor(otelgrpc.WithTracerProvider(provider), otelgrpc.WithPropagators(propagators)),
)
deps.Middleware.Add(func(h http.Handler) http.Handler {
return otelhttp.NewHandler(h, "",
otelhttp.WithTracerProvider(provider),
otelhttp.WithSpanNameFormatter(func(_ string, r *http.Request) string {
return fmt.Sprintf("%s %s", r.Method, r.URL.Path)
}))
})
global.mu.Lock()
global.tracerProvider = provider
global.mu.Unlock()
return nil
}
func consumeExporters() []trace.SpanExporter {
global.mu.Lock()
defer global.mu.Unlock()
exporters := global.exporters
global.initialized = true
return exporters
}
type close struct {
tp *trace.TracerProvider
}
func (c close) Close(ctx context.Context) error {
ctxWithTimeout, cancel := context.WithTimeout(ctx, *tracingShutdownTimeout)
defer cancel()
return c.tp.Shutdown(ctxWithTimeout)
}
func getTracerProvider() (t.TracerProvider, error) {
global.mu.Lock()
defer global.mu.Unlock()
if !global.initialized {
return nil, errors.New("tried to get a non-initialized TracerProvider; you need to use initializeAfter")
}
return global.tracerProvider, nil
}
type DeferredTracerProvider interface {
GetTracerProvider() (t.TracerProvider, error)
}
func ProvideTracerProvider(context.Context, *NoArgs, ExtensionDeps) (DeferredTracerProvider, error) {
return deferredTracerProvider{}, nil
}
type deferredTracerProvider struct{}
func (deferredTracerProvider) GetTracerProvider() (t.TracerProvider, error) {
return getTracerProvider()
}