/
tracing.go
102 lines (88 loc) · 2.46 KB
/
tracing.go
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package telemetry
import (
"context"
"fmt"
"os"
"github.com/rs/zerolog/log"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/propagation"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
oteltrace "go.opentelemetry.io/otel/trace"
)
// ----------------------------------------
// Tracer Setup and Teardown
// ----------------------------------------
func newTraceProvider() {
// The context passed in to the exporter is only passed to the client and used when connecting to the endpoint
ctx := context.Background()
if !isTracingEnabled() {
log.Ctx(ctx).Debug().Msgf("OLTP tracing endpoints are not defined. No traces will be exported")
return
}
client, err := GetTraceClient()
if err != nil {
log.Ctx(ctx).Error().Err(err).Msg("failed to initialize OLTP trace client")
return
}
exp, err := otlptrace.New(ctx, client)
if err != nil {
log.Ctx(ctx).Error().Err(err).Msg("failed to initialize OLTP trace exporter")
return
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithBatcher(exp),
sdktrace.WithResource(newResource()),
)
// set the global trace provider
otel.SetTracerProvider(loggingTracerProvider{delegate: tp})
otel.SetTextMapPropagator(
propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
),
)
}
func GetTraceClient() (client otlptrace.Client, err error) {
protocol := otlpProtocolHTTP
if v := os.Getenv(otlpProtocol); v != "" {
protocol = v
}
if v := os.Getenv(otlpTracesProtocol); v != "" {
protocol = v
}
switch protocol {
case otlpProtocolHTTP:
client = otlptracehttp.NewClient()
case otlpProtocolGrpc:
client = otlptracegrpc.NewClient()
default:
err = fmt.Errorf("unknown or unsupported OLTP protocol: %s. No traces will be exported", protocol)
}
return
}
func isTracingEnabled() bool {
if v, ok := os.LookupEnv(disableTracing); ok && v == "1" {
return false
}
if _, ok := os.LookupEnv(otlpEndpoint); ok {
return true
}
if _, ok := os.LookupEnv(otlpTracesEndpoint); ok {
return true
}
return false
}
func cleanupTraceProvider() error {
tracer, ok := otel.GetTracerProvider().(shutdownTracerProvider)
if ok {
return tracer.Shutdown(context.Background())
}
return nil
}
type shutdownTracerProvider interface {
oteltrace.TracerProvider
Shutdown(ctx context.Context) error
}