micro-examples/pubsub/tracer.go

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package main
import (
"context"
"fmt"
"io"
opentracing "github.com/opentracing/opentracing-go"
jconfig "github.com/uber/jaeger-client-go/config"
"go.unistack.org/micro/v3/logger"
)
func NewTracer(cfg *TracerConfig) (opentracing.Tracer, io.Closer, error) {
jcfg := &jconfig.Configuration{
ServiceName: cfg.Service,
Sampler: &jconfig.SamplerConfig{
Type: "remote",
Param: 1,
},
Reporter: &jconfig.ReporterConfig{
LogSpans: false,
QueueSize: 100,
},
}
if len(cfg.AgentHost) > 0 {
jcfg.Sampler.SamplingServerURL = fmt.Sprintf("http://%s:5778/sampling", cfg.AgentHost)
}
if len(cfg.AgentHost) > 0 {
agentPort := "6831"
if len(cfg.AgentPort) > 0 {
agentPort = cfg.AgentPort
}
jcfg.Reporter.LocalAgentHostPort = fmt.Sprintf("%s:%s", cfg.AgentHost, agentPort)
} else if len(cfg.Collector) > 0 {
jcfg.Reporter.CollectorEndpoint = cfg.Collector
}
for k, v := range cfg.Metadata {
jcfg.Tags = append(jcfg.Tags, opentracing.Tag{Key: k, Value: v})
}
tracer, closer, err := jcfg.NewTracer(jconfig.Logger(&log{}))
if err != nil {
return nil, nil, err
}
opentracing.SetGlobalTracer(tracer)
return tracer, closer, nil
}
type log struct{}
func (l *log) Error(msg string) {
logger.Error(context.Background(), msg)
}
func (l *log) Infof(msg string, args ...interface{}) {
logger.Infof(context.Background(), msg, args...)
}