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exporter.go
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exporter.go
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// Copyright © 2023 The Things Network Foundation, The Things Industries B.V.
//
// 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"
"crypto/tls"
"errors"
"io"
"os"
"strings"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
)
func exporterFromConfig(ctx context.Context, config *Config) (sdktrace.SpanExporter, error) {
switch strings.ToLower(config.Exporter) {
case "otlp":
return initOTLPExporter(ctx, &config.CollectorConfig)
case "writer":
return initWriterExporter(&config.WriterConfig)
default:
return nil, errUnknownExporter.WithAttributes("exporter", config.Exporter)
}
}
func initOTLPExporter(ctx context.Context, config *CollectorConfig) (sdktrace.SpanExporter, error) {
var opts []grpc.DialOption
if config.Insecure {
opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
} else {
tlsConfig := &tls.Config{
MinVersion: tls.VersionTLS12,
}
if err := config.TLS.ApplyTo(tlsConfig); err != nil {
return nil, err
}
opts = append(opts, grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)))
}
conn, err := grpc.DialContext(ctx, config.EndpointURL, append(opts,
grpc.FailOnNonTempDialError(true),
grpc.WithBlock(),
)...)
if err != nil {
return nil, err
}
return otlptracegrpc.New(ctx, otlptracegrpc.WithGRPCConn(conn))
}
func initWriterExporter(config *WriterConfig) (sdktrace.SpanExporter, error) {
var opts []stdouttrace.Option
if config.Pretty {
opts = append(opts, stdouttrace.WithPrettyPrint())
}
if !config.Timestamps {
opts = append(opts, stdouttrace.WithoutTimestamps())
}
var w io.Writer
switch strings.ToLower(config.Destination) {
case "stdout":
w = os.Stdout
case "stderr":
w = os.Stderr
default:
return nil, errors.New("unknown writer destination")
}
opts = append(opts, stdouttrace.WithWriter(w))
return stdouttrace.New(opts...)
}