/
tracer.go
155 lines (126 loc) · 3.39 KB
/
tracer.go
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package gtrace
import (
"context"
"strconv"
"github.com/openzipkin/zipkin-go"
"github.com/openzipkin/zipkin-go/model"
"github.com/micro/go-micro/client"
merr "github.com/micro/go-micro/errors"
"github.com/micro/go-micro/metadata"
"github.com/micro/go-micro/server"
)
const (
tracePropagationField = "Tracer-Context"
)
var (
// tagStatusCode is the RPC status code.
tagStatusCode = zipkin.Tag("rpc.status")
StatusOK = "200"
)
func checkAndSetSpanTagError(sp zipkin.Span, err error) {
if err != nil {
if e, ok := err.(*merr.Error); ok {
tagStatusCode.Set(sp, strconv.FormatInt(int64(e.Code), 10))
zipkin.TagError.Set(sp, e.Detail)
} else {
zipkin.TagError.Set(sp, err.Error())
}
} else {
tagStatusCode.Set(sp, StatusOK)
}
}
type clientWrapper struct{ client.Client }
// Call implements client.Client.Call.
func (w *clientWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) (err error) {
var sp, cCtx = tc.StartSpanFromContext(ctx, "rpc/client/"+req.Service()+"/"+req.Method())
defer func() {
checkAndSetSpanTagError(sp, err)
sp.Finish()
}()
ctx = injectTraceIntoCtx(cCtx, sp)
err = w.Client.Call(ctx, req, rsp, opts...)
return
}
// Publish implements client.Client.Publish.
func (w *clientWrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) (err error) {
var sp, cCtx = tc.StartSpanFromContext(ctx, "rpc/pub/"+p.Topic())
defer func() {
checkAndSetSpanTagError(sp, err)
sp.Finish()
}()
err = w.Client.Publish(cCtx, p, opts...)
return
}
func NewClientWrapper() client.Wrapper {
return func(c client.Client) client.Client {
return &clientWrapper{c}
}
}
func getTraceFromCtx(ctx context.Context) *model.SpanContext {
md, ok := metadata.FromContext(ctx)
if !ok {
md = make(map[string]string)
}
encodedTraceCtx, ok := md[tracePropagationField]
if !ok {
return nil
}
if sCtx, ok := unmarshal([]byte(encodedTraceCtx)); ok {
return &sCtx
}
return nil
}
func injectTraceIntoCtx(ctx context.Context, sp zipkin.Span) context.Context {
md, ok := metadata.FromContext(ctx)
if !ok {
md = make(map[string]string)
}
md[tracePropagationField] = string(marshal(sp.Context()))
return metadata.NewContext(ctx, md)
}
func NewHandlerWrapper() server.HandlerWrapper {
return func(fn server.HandlerFunc) server.HandlerFunc {
return func(ctx context.Context, req server.Request, rsp interface{}) (err error) {
var sp zipkin.Span
var spanCtx = getTraceFromCtx(ctx)
if spanCtx != nil {
sp, ctx = tc.StartSpanFromContext(
ctx,
"rpc/server/"+req.Service()+"/"+req.Method(),
zipkin.Parent(*spanCtx),
)
} else {
sp = tc.StartSpan("rpc/server/" + req.Service() + "/" + req.Method())
}
defer func() {
checkAndSetSpanTagError(sp, err)
sp.Finish()
}()
err = fn(ctx, req, rsp)
return
}
}
}
func NewSubscriberWrapper() server.SubscriberWrapper {
return func(fn server.SubscriberFunc) server.SubscriberFunc {
return func(ctx context.Context, p server.Message) (err error) {
var sp zipkin.Span
var spanCtx = getTraceFromCtx(ctx)
if spanCtx != nil {
sp, ctx = tc.StartSpanFromContext(
ctx,
"rpc/sub/"+p.Topic(),
zipkin.Parent(*spanCtx),
)
} else {
sp = tc.StartSpan("rpc/sub/" + p.Topic())
}
defer func() {
checkAndSetSpanTagError(sp, err)
sp.Finish()
}()
err = fn(ctx, p)
return
}
}
}