Documentation
¶
Overview ¶
Package twirp provides tracing functions for tracing clients and servers generated by the twirp framework (https://github.com/twitchtv/twirp).
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func NewServerHooks ¶
func NewServerHooks(opts ...Option) *twirp.ServerHooks
NewServerHooks creates the callback hooks for a twirp server to perform tracing. It is used in conjunction with WrapServer.
func WrapServer ¶
WrapServer wraps an http.Handler to add distributed tracing to a Twirp server.
Example ¶
package main
import (
"context"
"net/http"
twirptrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/twitchtv/twirp"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
"github.com/twitchtv/twirp/example"
)
type hatmaker struct{}
func (hatmaker) MakeHat(_ context.Context, _ *example.Size) (*example.Hat, error) {
return &example.Hat{
Size: 42,
Color: "cornflower blue",
Name: "oversized blue hat",
}, nil
}
func main() {
tracer.Start()
defer tracer.Stop()
server := example.NewHaberdasherServer(hatmaker{}, twirptrace.NewServerHooks())
traced := twirptrace.WrapServer(server)
http.ListenAndServe(":8080", traced)
}
Output:
Types ¶
type HTTPClient ¶
HTTPClient is duplicated from twirp's generated service code. It is declared in this package so that the client can be wrapped to initiate traces.
func WrapClient ¶
func WrapClient(c HTTPClient, opts ...Option) HTTPClient
WrapClient wraps an HTTPClient to add distributed tracing to its requests.
Example ¶
package main
import (
"context"
"fmt"
"net/http"
twirptrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/twitchtv/twirp"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
"github.com/twitchtv/twirp/example"
)
func main() {
tracer.Start()
defer tracer.Stop()
client := example.NewHaberdasherJSONClient("http://localhost:8080", twirptrace.WrapClient(&http.Client{}))
for i := 0; i < 10; i++ {
hat, err := client.MakeHat(context.Background(), &example.Size{Inches: 6})
if err != nil {
fmt.Println("error making hat:", err)
continue
}
fmt.Println("made hat:", hat)
}
}
Output:
type Option ¶
Option represents an option that can be passed to Dial.
func WithAnalytics ¶
WithAnalytics enables Trace Analytics for all started spans.
func WithAnalyticsRate ¶
WithAnalyticsRate sets the sampling rate for Trace Analytics events correlated to started spans.
func WithServiceName ¶
WithServiceName sets the given service name for the dialled connection. When the service name is not explicitly set, it will be inferred based on the request to the twirp service.
Source Files