gorouter

A simple and fast HTTP router for Go.

Motivation

I wanted a simple, fast router that has no unnecessary overhead using the standard library only, following good practices and well tested code.

Features

• Fast - see benchmarks
• URL parameters
• Regex parameters
• Routes groups
• Custom NotFoundHandler
• Middleware chain Support
• No external dependencies (just Go 1.7+ stdlib)

Installation

go get github.com/xujiajun/gorouter

Usage

Static routes

package main

import (
	"log"
	"net/http"
	"github.com/xujiajun/gorouter"
)

func main() {
	mux := gorouter.New()
	mux.GET("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("hello world"))
	})
	log.Fatal(http.ListenAndServe(":8181", mux))
}

URL Parameters

package main

import (
	"github.com/xujiajun/gorouter"
	"log"
	"net/http"
)

func main() {
	mux := gorouter.New()
	//url parameters match
	mux.GET("/user/:id", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("match user/:id !"))
	})

	log.Fatal(http.ListenAndServe(":8181", mux))
}

Regex Parameters

package main

import (
	"github.com/xujiajun/gorouter"
	"log"
	"net/http"
)

func main() {
	mux := gorouter.New()
	//url regex match
	mux.GET("/user/{id:[0-9]+}", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("match user/{id:[0-9]+} !"))
	})

	log.Fatal(http.ListenAndServe(":8181", mux))
}

Group routes

package main

import (
	"fmt"
	"github.com/xujiajun/gorouter"
	"log"
	"net/http"
)

func usersHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprint(w, "/api/users")
}

func main() {
	mux := gorouter.New()
	mux.Group("/api").GET("/users", usersHandler)

	log.Fatal(http.ListenAndServe(":8181", mux))
}

Custom NotFoundHandler

package main

import (
	"fmt"
	"github.com/xujiajun/gorouter"
	"log"
	"net/http"
)

func notFoundFunc(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(http.StatusNotFound)
	fmt.Fprint(w, "404 page !!!")
}

func main() {
	mux := gorouter.New()
	mux.NotFoundFunc(notFoundFunc)
	mux.GET("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("hello world"))
	})

	log.Fatal(http.ListenAndServe(":8181", mux))
}

Middlewares

package main

import (
	"fmt"
	"github.com/xujiajun/gorouter"
	"log"
	"net/http"
)

type statusRecorder struct {
	http.ResponseWriter
	status int
}

func (rec *statusRecorder) WriteHeader(code int) {
	rec.status = code
	rec.ResponseWriter.WriteHeader(code)
}

//https://upgear.io/blog/golang-tip-wrapping-http-response-writer-for-middleware/
func withStatusRecord(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		rec := statusRecorder{w, http.StatusOK}
		next.ServeHTTP(&rec, r)
		log.Printf("response status: %v\n", rec.status)
	}
}

func notFoundFunc(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(http.StatusNotFound)
	fmt.Fprint(w, "Not found page !")
}

func withLogging(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		log.Printf("Logged connection from %s", r.RemoteAddr)
		next.ServeHTTP(w, r)
	}
}

func withTracing(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		log.Printf("Tracing request for %s", r.RequestURI)
		next.ServeHTTP(w, r)
	}
}

func main() {
	mux := gorouter.New()
	mux.NotFoundFunc(notFoundFunc)
	mux.Use(withLogging, withTracing, withStatusRecord)
	mux.GET("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("hello world"))
	})

	log.Fatal(http.ListenAndServe(":8181", mux))
}

Pattern Rule

The syntax here is modeled after julienschmidt/httprouter and gorilla/mux

Syntax	Description	Example
:name	named parameter	/user/:name
{name}	named parameter	/user/{name}
{name:regexp}	named with regexp parameter	/user/{name:[0-9a-zA-Z]+}
:id	named with regexp parameter	/user/:id

And :id is short for {id:[0-9]+}, {name} and :name are short for {name:[0-9a-zA-Z]+}

Benchmarks

go test -bench=.

Benchmark System:

• Go version 1.9.2
• OS: Mac OS X 10.13.3
• Architecture: x86_64
• 16 GB 2133 MHz LPDDR3

Tested routers:

• julienschmidt/httprouter
• xujiajun/GoRouter
• gorilla/mux

Result:

GithubAPI Routes: 203
GithubAPI2 Routes: 203
   HttpRouter: 37464 Bytes
   GoRouter: 83616 Bytes
   MuxRouter: 1324192 Bytes
goos: darwin
goarch: amd64
pkg: github.com/xujiajun/gorouter
BenchmarkHttpRouter-8   	   10000	    517116 ns/op	 1034339 B/op	    2604 allocs/op
BenchmarkGoRouter-8     	   10000	    551223 ns/op	 1034385 B/op	    2843 allocs/op
BenchmarkMuxRouter-8    	   10000	   5825422 ns/op	 1272958 B/op	    4691 allocs/op
PASS
ok  	github.com/xujiajun/gorouter	68.965s

Conclusions:

• Memory Consumption (HttpRouter > gorouter > MuxRouter)

• Performance (HttpRouter > gorouter > MuxRouter)

• Features (HttpRouter not support regexp, But GoRouter and MuxRouter support)

As author of HttpRouter said performance can not be the (only) criterion for choosing a router. Play around a bit with some of the routers, and choose the one you like best. Moreover main memory is cheap and usually not a scarce resource.

Contributing

If you'd like to help out with the project. You can put up a Pull Request.

Acknowledgements

This package is inspired by the following:

• httprouter
• bone
• trie-mux
• alien

License

The gorouter is open-sourced software licensed under the MIT Licensed