httprouter

Documentation

Overview

Package httprouter provides functions to trace the julienschmidt/httprouter package (https://github.com/julienschmidt/httprouter).

Example

package main

import (
	"fmt"
	"log"
	"net/http"

	"github.com/julienschmidt/httprouter"

	httptrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/julienschmidt/httprouter"
)

func Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	fmt.Fprint(w, "Welcome!\n")
}

func Hello(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	fmt.Fprintf(w, "hello, %s!\n", ps.ByName("name"))
}

func main() {
	router := httptrace.New()
	router.GET("/", Index)
	router.GET("/hello/:name", Hello)

	log.Fatal(http.ListenAndServe(":8080", router))
}

Example (WithServiceName)

package main

import (
	"fmt"
	"log"
	"net/http"

	"github.com/julienschmidt/httprouter"

	httptrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/julienschmidt/httprouter"
)

func Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	fmt.Fprint(w, "Welcome!\n")
}

func Hello(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	fmt.Fprintf(w, "hello, %s!\n", ps.ByName("name"))
}

func main() {
	router := httptrace.New(httptrace.WithServiceName("http.router"))
	router.GET("/", Index)
	router.GET("/hello/:name", Hello)

	log.Fatal(http.ListenAndServe(":8080", router))
}

Example (WithSpanOpts)

package main

import (
	"fmt"
	"log"
	"net/http"

	"github.com/julienschmidt/httprouter"

	httptrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/julienschmidt/httprouter"
	"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
	"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)

func Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	fmt.Fprint(w, "Welcome!\n")
}

func Hello(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	fmt.Fprintf(w, "hello, %s!\n", ps.ByName("name"))
}

func main() {
	router := httptrace.New(
		httptrace.WithServiceName("http.router"),
		httptrace.WithSpanOptions(
			tracer.Tag(ext.SamplingPriority, ext.PriorityUserKeep),
		),
	)

	router.GET("/", Index)
	router.GET("/hello/:name", Hello)

	log.Fatal(http.ListenAndServe(":8080", router))
}

Index

• type Router
  • func New(opts ...RouterOption) *Router
  • func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request)
• type RouterOption
  • func WithAnalytics(on bool) RouterOption
  • func WithAnalyticsRate(rate float64) RouterOption
  • func WithServiceName(name string) RouterOption
  • func WithSpanOptions(opts ...ddtrace.StartSpanOption) RouterOption

Examples

• Package
• Package (WithServiceName)
• Package (WithSpanOpts)

Types

type Router

type Router struct {
	*httprouter.Router
	// contains filtered or unexported fields
}

Router is a traced version of httprouter.Router.

func New

func New(opts ...RouterOption) *Router

New returns a new router augmented with tracing.

func (*Router) ServeHTTP

func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request)

ServeHTTP implements http.Handler.

type RouterOption

type RouterOption func(*routerConfig)

RouterOption represents an option that can be passed to New.

func WithAnalytics

func WithAnalytics(on bool) RouterOption

WithAnalytics enables Trace Analytics for all started spans.

func WithAnalyticsRate

func WithAnalyticsRate(rate float64) RouterOption

WithAnalyticsRate sets the sampling rate for Trace Analytics events correlated to started spans.

func WithServiceName

func WithServiceName(name string) RouterOption

WithServiceName sets the given service name for the returned router.

func WithSpanOptions

func WithSpanOptions(opts ...ddtrace.StartSpanOption) RouterOption

WithSpanOptions applies the given set of options to the span started by the router.