forked from Jarnpher553/gemini
/
transport.go
55 lines (45 loc) · 1.38 KB
/
transport.go
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package httpclient
import (
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/openzipkin/zipkin-go/model"
"net/http"
"time"
)
// Transport http客户端自定义传输类
type Transport struct {
http.RoundTripper
ServiceName string
}
// RoundTrip 实现传输类必要方法
func (tran *Transport) RoundTrip(r *http.Request) (*http.Response, error) {
ctx := r.Context()
span, _ := opentracing.StartSpanFromContext(ctx, tran.ServiceName,
ext.SpanKindRPCClient,
opentracing.StartTime(time.Now()),
opentracing.Tag{Key: string(ext.HTTPUrl), Value: r.URL.Path},
opentracing.Tag{Key: string(ext.HTTPMethod), Value: r.Method})
defer span.Finish()
_ = opentracing.GlobalTracer().Inject(span.Context(), opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(r.Header))
return tran.RoundTripper.RoundTrip(r)
}
// InjectHttp 将context写入http请求头
func InjectHttp(r *http.Request) func(model.SpanContext) {
return func(sc model.SpanContext) {
if sc.Debug {
r.Header.Set("jar-flags", "1")
}
if *sc.Sampled {
r.Header.Set("jar-sampled", "1")
} else {
r.Header.Set("jar-sampled", "0")
}
r.Header.Set("jar-traceid", sc.TraceID.String())
r.Header.Set("jar-spanid", sc.ID.String())
if sc.ParentID != nil {
r.Header.Set("jar-parentid", sc.ParentID.String())
} else {
r.Header.Set("jar-parentid", "0")
}
}
}