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config.go
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config.go
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// Copyright 2020 Douyu
//
// 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 jaeger
import (
"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/jaeger"
"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"
)
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: "http://localhost:14268/api/traces",
Sampler: 0,
}
}
// Build ...
func (config *Config) Build() trace.TracerProvider {
// Create the Jaeger exporter
exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(config.Endpoint)))
if err != nil {
xlog.Jupiter().Panic("new jaeger", 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(exp),
// Record information about this application in an Resource.
tracesdk.WithResource(resource.NewSchemaless(
semconv.TelemetrySDKLanguageGo,
semconv.ServiceNameKey.String(config.Name),
)),
)
otel.SetTracerProvider(tp)
return tp
}