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jtracer.go
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jtracer.go
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// Copyright (c) 2023 The Jaeger Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package jtracer
import (
"context"
"sync"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
"go.opentelemetry.io/otel/trace"
nooptrace "go.opentelemetry.io/otel/trace/noop"
)
type JTracer struct {
OTEL trace.TracerProvider
closer func(ctx context.Context) error
}
var once sync.Once
func New(serviceName string) (*JTracer, error) {
return newHelper(serviceName, initOTEL)
}
func newHelper(
serviceName string,
tracerProvider func(ctx context.Context, svc string) (*sdktrace.TracerProvider, error),
) (*JTracer, error) {
ctx := context.Background()
provider, err := tracerProvider(ctx, serviceName)
if err != nil {
return nil, err
}
return &JTracer{
OTEL: provider,
closer: func(ctx context.Context) error {
return provider.Shutdown(ctx)
},
}, nil
}
func NoOp() *JTracer {
return &JTracer{
OTEL: nooptrace.NewTracerProvider(),
}
}
// initOTEL initializes OTEL Tracer
func initOTEL(ctx context.Context, svc string) (*sdktrace.TracerProvider, error) {
return initHelper(ctx, svc, otelExporter, otelResource)
}
func initHelper(
ctx context.Context,
svc string,
otelExporter func(ctx context.Context) (sdktrace.SpanExporter, error),
otelResource func(ctx context.Context, svc string) (*resource.Resource, error),
) (*sdktrace.TracerProvider, error) {
res, err := otelResource(ctx, svc)
if err != nil {
return nil, err
}
traceExporter, err := otelExporter(ctx)
if err != nil {
return nil, err
}
// Register the trace exporter with a TracerProvider, using a batch
// span processor to aggregate spans before export.
bsp := sdktrace.NewBatchSpanProcessor(traceExporter)
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithSpanProcessor(bsp),
sdktrace.WithResource(res),
)
once.Do(func() {
otel.SetTextMapPropagator(
propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
))
})
otel.SetTracerProvider(tracerProvider)
return tracerProvider, nil
}
func otelResource(ctx context.Context, svc string) (*resource.Resource, error) {
return resource.New(
ctx,
resource.WithSchemaURL(semconv.SchemaURL),
resource.WithAttributes(semconv.ServiceNameKey.String(svc)),
resource.WithTelemetrySDK(),
resource.WithHost(),
resource.WithOSType(),
resource.WithFromEnv(),
)
}
func otelExporter(ctx context.Context) (sdktrace.SpanExporter, error) {
client := otlptracegrpc.NewClient(
otlptracegrpc.WithInsecure(),
)
return otlptrace.New(ctx, client)
}
// Shutdown the tracerProvider to clean up resources
func (jt *JTracer) Close(ctx context.Context) error {
if jt.closer != nil {
return jt.closer(ctx)
}
return nil
}