gorouter

xujiajun/gorouter is a simple and fast HTTP router for Go. It is easy to build RESTful APIs and your web framework.

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
• Custom PanicHandler
• Middleware Chain Support
• Serve Static Files
• Pattern Rule Familiar
• HTTP Method Get、Post、Delete、Put、Patch Support
• No external dependencies (just Go stdlib)

Requirements

• golang 1.8+

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) {
		//get one URL parameter
		id := gorouter.GetParam(r, "id")
		//get all URL parameters
		//id := gorouter.GetAllParams(r)
		//fmt.Println(id)
		w.Write([]byte("match user/:id ! get id:" + 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))
}

Routes Groups

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))
}

Custom PanicHandler

package main

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

func main() {
	mux := gorouter.New()
	mux.PanicHandler = func(w http.ResponseWriter, req *http.Request, err interface{}) {
		w.WriteHeader(http.StatusInternalServerError)
		fmt.Println("err from recover is :", err)
		fmt.Fprint(w, "received a panic")
	}
	mux.GET("/panic", func(w http.ResponseWriter, r *http.Request) {
		panic("panic")
	})

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

Middlewares Chain

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))
}

Serve static files

package main

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

//ServeFiles serve static resources
func ServeFiles(w http.ResponseWriter, r *http.Request) {
	wd, err := os.Getwd()
	if err != nil {
		log.Fatal(err)
	}

	dir := wd + "/examples/serveStaticFiles/files"
	http.StripPrefix("/files/", http.FileServer(http.Dir(dir))).ServeHTTP(w, r)
}

func main() {
	mux := gorouter.New()
	mux.GET("/hi", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("hi"))
	})
	//defined prefix
	mux2 := mux.Group("/files")
	//http://127.0.0.1:8181/files/demo.txt
	//will match
	mux2.GET("/{filename:[0-9a-zA-Z_.]+}", func(w http.ResponseWriter, r *http.Request) {
		ServeFiles(w, r)
	})

	//http://127.0.0.1:8181/files/a/demo2.txt
	//http://127.0.0.1:8181/files/a/demo.txt
	//will match
	mux2.GET("/{fileDir:[0-9a-zA-Z_.]+}/{filename:[0-9a-zA-Z_.]+}", func(w http.ResponseWriter, r *http.Request) {
		ServeFiles(w, r)
	})

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

Detail see serveStaticFiles example

Pattern Rule

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

Syntax	Description	Example
: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 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
• trie-mux/mux

Result:

➜  gorouter git:(master) ✗ go test -bench=.     
GithubAPI Routes: 203
GithubAPI2 Routes: 203
   HttpRouter: 37464 Bytes
   GoRouter: 83616 Bytes
   trie-mux: 135096 Bytes
   MuxRouter: 1324192 Bytes
goos: darwin
goarch: amd64
pkg: github.com/xujiajun/gorouter
BenchmarkTrieMuxRouter-8           10000            692179 ns/op         1086465 B/op       2975 allocs/op
BenchmarkHttpRouter-8              10000            627134 ns/op         1034366 B/op       2604 allocs/op
BenchmarkGoRouter-8                10000            630895 ns/op         1034415 B/op       2843 allocs/op
BenchmarkMuxRouter-8               10000           6396340 ns/op         1272876 B/op       4691 allocs/op
PASS
ok      github.com/xujiajun/gorouter    83.503s

Conclusions:

• Performance (xujiajun/gorouter ≈ julienschmidt/httprouter > teambition/trie-mux > gorilla/mux)

• Memory Consumption (xujiajun/gorouter ≈ julienschmidt/httprouter < teambition/trie-mux < gorilla/mux)

• Features (xujiajun/gorouter, gorilla/mux and teambition/trie-mux support regexp, But julienschmidt/httprouter not support)

if you want a performance router which support regexp, maybe xujiajun/gorouter is good choice.

Contributing

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

Author

• xujiajun

License

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

Acknowledgements

This package is inspired by the following:

• httprouter
• bone
• trie-mux
• alien