forked from st3v/go-plugins
-
Notifications
You must be signed in to change notification settings - Fork 0
/
opentracing.go
91 lines (82 loc) · 2.76 KB
/
opentracing.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
// Package opentracing provides wrappers for OpenTracing
package opentracing
import (
"fmt"
"github.com/micro/go-micro/client"
"github.com/micro/go-micro/metadata"
"github.com/micro/go-micro/server"
"github.com/opentracing/opentracing-go"
"golang.org/x/net/context"
)
type otWrapper struct {
ot opentracing.Tracer
client.Client
}
func traceIntoContext(ctx context.Context, tracer opentracing.Tracer, name string) (context.Context, opentracing.Span, error) {
md, _ := metadata.FromContext(ctx)
var sp opentracing.Span
wireContext, err := tracer.Extract(opentracing.TextMap, opentracing.TextMapCarrier(md))
if err != nil {
sp = tracer.StartSpan(name)
} else {
sp = tracer.StartSpan(name, opentracing.ChildOf(wireContext))
}
if err := sp.Tracer().Inject(sp.Context(), opentracing.TextMap, opentracing.TextMapCarrier(md)); err != nil {
return nil, nil, err
}
ctx = opentracing.ContextWithSpan(ctx, sp)
ctx = metadata.NewContext(ctx, md)
return ctx, sp, nil
}
func (o *otWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
name := fmt.Sprintf("%s.%s", req.Service(), req.Method())
ctx, span, err := traceIntoContext(ctx, o.ot, name)
if err != nil {
return err
}
defer span.Finish()
return o.Client.Call(ctx, req, rsp, opts...)
}
func (o *otWrapper) Publish(ctx context.Context, p client.Publication, opts ...client.PublishOption) error {
name := fmt.Sprintf("Pub to %s", p.Topic())
ctx, span, err := traceIntoContext(ctx, o.ot, name)
if err != nil {
return err
}
defer span.Finish()
return o.Client.Publish(ctx, p, opts...)
}
// NewClientWrapper accepts an open tracing Trace and returns a Client Wrapper
func NewClientWrapper(ot opentracing.Tracer) client.Wrapper {
return func(c client.Client) client.Client {
return &otWrapper{ot, c}
}
}
// NewHandlerWrapper accepts an opentracing Tracer and returns a Handler Wrapper
func NewHandlerWrapper(ot opentracing.Tracer) server.HandlerWrapper {
return func(h server.HandlerFunc) server.HandlerFunc {
return func(ctx context.Context, req server.Request, rsp interface{}) error {
name := fmt.Sprintf("%s.%s", req.Service(), req.Method())
ctx, span, err := traceIntoContext(ctx, ot, name)
if err != nil {
return err
}
defer span.Finish()
return h(ctx, req, rsp)
}
}
}
// NewSubscriberWrapper accepts an opentracing Tracer and returns a Subscriber Wrapper
func NewSubscriberWrapper(ot opentracing.Tracer) server.SubscriberWrapper {
return func(next server.SubscriberFunc) server.SubscriberFunc {
return func(ctx context.Context, msg server.Publication) error {
name := "Pub to " + msg.Topic()
ctx, span, err := traceIntoContext(ctx, ot, name)
if err != nil {
return err
}
defer span.Finish()
return next(ctx, msg)
}
}
}