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init.go
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init.go
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// Copyright (c) 2019 The Jaeger Authors.
// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 tracing
import (
"context"
"errors"
"fmt"
"os"
"strings"
"sync"
"time"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"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"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/examples/hotrod/pkg/log"
"github.com/jaegertracing/jaeger/examples/hotrod/pkg/tracing/rpcmetrics"
"github.com/jaegertracing/jaeger/pkg/metrics"
)
var once sync.Once
// InitOTEL initializes OpenTelemetry SDK.
func InitOTEL(serviceName string, exporterType string, metricsFactory metrics.Factory, logger log.Factory) trace.TracerProvider {
once.Do(func() {
otel.SetTextMapPropagator(
propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
))
})
exp, err := createOtelExporter(exporterType)
if err != nil {
logger.Bg().Fatal("cannot create exporter", zap.String("exporterType", exporterType), zap.Error(err))
}
logger.Bg().Debug("using " + exporterType + " trace exporter")
rpcmetricsObserver := rpcmetrics.NewObserver(metricsFactory, rpcmetrics.DefaultNameNormalizer)
res, err := resource.New(
context.Background(),
resource.WithSchemaURL(semconv.SchemaURL),
resource.WithAttributes(semconv.ServiceNameKey.String(serviceName)),
resource.WithTelemetrySDK(),
resource.WithHost(),
resource.WithOSType(),
)
if err != nil {
logger.Bg().Fatal("resource creation failed", zap.Error(err))
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithBatcher(exp, sdktrace.WithBatchTimeout(1000*time.Millisecond)),
sdktrace.WithSpanProcessor(rpcmetricsObserver),
sdktrace.WithResource(res),
)
logger.Bg().Debug("Created OTEL tracer", zap.String("service-name", serviceName))
return tp
}
// withSecure instructs the client to use HTTPS scheme, instead of hotrod's desired default HTTP
func withSecure() bool {
return strings.HasPrefix(os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT"), "https://") ||
strings.ToLower(os.Getenv("OTEL_EXPORTER_OTLP_INSECURE")) == "false"
}
func createOtelExporter(exporterType string) (sdktrace.SpanExporter, error) {
var exporter sdktrace.SpanExporter
var err error
switch exporterType {
case "jaeger":
return nil, errors.New("jaeger exporter is no longer supported, please use otlp")
case "otlp":
var opts []otlptracehttp.Option
if !withSecure() {
opts = []otlptracehttp.Option{otlptracehttp.WithInsecure()}
}
exporter, err = otlptrace.New(
context.Background(),
otlptracehttp.NewClient(opts...),
)
case "stdout":
exporter, err = stdouttrace.New()
default:
return nil, fmt.Errorf("unrecognized exporter type %s", exporterType)
}
return exporter, err
}