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"

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

	"github.com/julienschmidt/httprouter"
)

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

func Hello(w http.ResponseWriter, _ *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"

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

	"github.com/julienschmidt/httprouter"
)

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

func Hello(w http.ResponseWriter, _ *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"

	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"

	"github.com/julienschmidt/httprouter"
)

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

func Hello(w http.ResponseWriter, _ *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 WithHeaderTags(headers []string) RouterOption
  • func WithServiceName(name string) RouterOption
  • func WithSpanOptions(opts ...ddtrace.StartSpanOption) RouterOption

Examples

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

Types

type Router

type Router struct {
	*v2.Router
}

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 = v2.RouterOption

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 WithHeaderTags

func WithHeaderTags(headers []string) RouterOption

WithHeaderTags enables the integration to attach HTTP request headers as span tags. Warning: Using this feature can risk exposing sensitive data such as authorization tokens to Datadog. Special headers can not be sub-selected. E.g., an entire Cookie header would be transmitted, without the ability to choose specific Cookies.

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.