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config.go
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config.go
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package otelgrpc
import (
"context"
"time"
"github.com/douyu/jupiter/pkg"
"github.com/douyu/jupiter/pkg/conf"
"github.com/douyu/jupiter/pkg/xlog"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/sdk/resource"
tracesdk "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
"go.opentelemetry.io/otel/trace"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
type Config struct {
Name string
Endpoint string
Sampler float64
}
// RawConfig ...
func RawConfig(key string) *Config {
var config = DefaultConfig()
if err := conf.UnmarshalKey(key, config); err != nil {
xlog.Jupiter().Panic("unmarshal key", xlog.Any("err", err))
}
return config
}
// DefaultConfig ...
func DefaultConfig() *Config {
return &Config{
Name: pkg.Name(),
Endpoint: "localhost:4317",
Sampler: 0,
}
}
// Build ...
func (config *Config) Build() trace.TracerProvider {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
conn, err := grpc.DialContext(ctx, config.Endpoint, grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
xlog.Jupiter().Panic("new otelgrpc", xlog.FieldMod("build"), xlog.FieldErr(err))
return nil
}
// Set up a trace exporter
traceExporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithGRPCConn(conn))
if err != nil {
xlog.Jupiter().Panic("new otelgrpc", xlog.FieldMod("build"), xlog.FieldErr(err))
return nil
}
tp := tracesdk.NewTracerProvider(
// Set the sampling rate based on the parent span to 100%
tracesdk.WithSampler(tracesdk.ParentBased(tracesdk.TraceIDRatioBased(config.Sampler))),
// Always be sure to batch in production.
tracesdk.WithBatcher(traceExporter),
// Record information about this application in an Resource.
tracesdk.WithResource(resource.NewSchemaless(
semconv.TelemetrySDKLanguageGo,
semconv.ServiceNameKey.String(config.Name),
)),
)
otel.SetTracerProvider(tp)
return tp
}