package pure

Pure is a fast radix-tree based HTTP router that sticks to the native implementations of Go's "net/http" package; in essence, keeping the handler implementations 'pure' by using Go 1.7's "context" package.

This makes heavy usage of github.com/go-playground/pkg/v5 for HTTP abstractions.

Why Another HTTP Router?

I initially created lars, which I still maintain, that wraps the native implementation, think of this package as a Go pure implementation of lars

Key & Unique Features

• It sticks to Go's native implementations while providing helper functions for convenience
• Fast & Efficient - pure uses a custom version of httprouter's radix tree, so incredibly fast and efficient.

Installation

Use go get

go get -u github.com/go-playground/pure/v5

Usage

package main

import (
	"net/http"

	"github.com/go-playground/pure/v5"
	mw "github.com/go-playground/pure/v5/_examples/middleware/logging-recovery"
)

func main() {

	p := pure.New()
	p.Use(mw.LoggingAndRecovery(true))

	p.Get("/", helloWorld)

	http.ListenAndServe(":3007", p.Serve())
}

func helloWorld(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("Hello World"))
}

RequestVars

This is an interface that is used to pass request scoped variables and functions using context.Context. It is implemented in this way because retrieving values from context isn't the fastest, and so using this the router can store multiple pieces of information while reducing lookup time to a single stored RequestVars.

Currently only the URL/SEO params are stored on the RequestVars but if/when more is added they can merely be added to the RequestVars and there will be no additional lookup time.

URL Params

p := p.New()

// the matching param will be stored in the context's params with name "id"
p.Get("/user/:id", UserHandler)

// extract params like so
rv := pure.RequestVars(r) // done this way so only have to extract from context once, read above
rv.URLParam(paramname)

// serve css, js etc.. pure.RequestVars(r).URLParam(pure.WildcardParam) will return the remaining path if 
// you need to use it in a custom handler...
p.Get("/static/*", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))).ServeHTTP)

...

Note: Since this router has only explicit matches, you can not register static routes and parameters for the same path segment. For example you can not register the patterns /user/new and /user/:user for the same request method at the same time. The routing of different request methods is independent from each other. I was initially against this, however it nearly cost me in a large web application where the dynamic param value say :type actually could have matched another static route and that's just too dangerous and so it is not allowed.

Groups

p.Use(LoggingAndRecovery, Gzip...)
...
p.Post("/users/add", ...)

// creates a group for /user/:userid + inherits all middleware registered previously by p
user := p.Group("/user/:userid")
user.Get("", ...)
user.Post("", ...)
user.Delete("/delete", ...)

contactInfo := user.Group("/contact-info/:cid")
contactinfo.Delete("/delete", ...)

// creates a group for /others, inherits all middleware registered previously by p + adds 
// OtherHandler to middleware
others := p.GroupWithMore("/others", OtherHandler)

// creates a group for /admin WITH NO MIDDLEWARE... more can be added using admin.Use()
admin := p.GroupWithNone("/admin")
admin.Use(SomeAdminSecurityMiddleware)
...

Decoding Body

currently JSON, XML, FORM, Multipart Form and url.Values are support out of the box; there are also individual functions for each as well when you know the Content-Type.

	// second argument denotes yes or no I would like URL query parameter fields
	// to be included. i.e. 'id' and 'id2' in route '/user/:id?id2=val' should it be included.
	if err := pure.Decode(r, true, maxBytes, &user); err != nil {
		log.Println(err)
	}

Misc

// set custom 404 ( not Found ) handler
p.Register404(404Handler, middleware_like_logging)

// Redirect to or from ending slash if route not found, default is true
p.SetRedirectTrailingSlash(true)

// Handle 405 ( Method Not allowed ), default is false
p.RegisterMethodNotAllowed(middleware)

// automatically handle OPTION requests; manually configured
// OPTION handlers take precedence. default false
p.RegisterAutomaticOPTIONS(middleware)

Middleware

There are some pre-defined middlewares within the middleware folder; NOTE: that the middleware inside will comply with the following rule(s):

• Are completely reusable by the community without modification

Other middleware will be listed under the _examples/middleware/... folder for a quick copy/paste modify. As an example a LoddingAndRecovery middleware is very application dependent and therefore will be listed under the _examples/middleware/...

Benchmarks

Run on i5-7600 16 GB DDR4-2400 using Go version go1.12.5 darwin/amd64

NOTICE: pure uses a custom version of httprouter's radix tree, benchmarks can be found here the slowdown is with the use of the context package, as you can see when no SEO params are defined, and therefore no need to store anything in the context, it is faster than even lars.

go test -bench=. -benchmem=true ./...
#GithubAPI Routes: 203
   Pure: 37096 Bytes

#GPlusAPI Routes: 13
   Pure: 2792 Bytes

#ParseAPI Routes: 26
   Pure: 5040 Bytes

#Static Routes: 157
   HttpServeMux: 14992 Bytes
   Pure: 21096 Bytes


goos: darwin
goarch: arm64
BenchmarkPure_Param             11965519               100.4 ns/op           256 B/op          1 allocs/op
BenchmarkPure_Param5             8756385               138.6 ns/op           256 B/op          1 allocs/op
BenchmarkPure_Param20            4335284               276.5 ns/op           256 B/op          1 allocs/op
BenchmarkPure_ParamWrite         9980685               120.0 ns/op           256 B/op          1 allocs/op
BenchmarkPure_GithubStatic      47743062                24.77 ns/op            0 B/op          0 allocs/op
BenchmarkPure_GithubParam        8514968               139.8 ns/op           256 B/op          1 allocs/op
BenchmarkPure_GithubAll            42250             28333 ns/op           42753 B/op        167 allocs/op
BenchmarkPure_GPlusStatic       87363000                13.39 ns/op            0 B/op          0 allocs/op
BenchmarkPure_GPlusParam        10398274               113.0 ns/op           256 B/op          1 allocs/op
BenchmarkPure_GPlus2Params       9235220               128.7 ns/op           256 B/op          1 allocs/op
BenchmarkPure_GPlusAll            792037              1526 ns/op            2816 B/op         11 allocs/op
BenchmarkPure_ParseStatic       79194198                14.96 ns/op            0 B/op          0 allocs/op
BenchmarkPure_ParseParam        11391336               104.5 ns/op           256 B/op          1 allocs/op
BenchmarkPure_Parse2Params      10103078               116.2 ns/op           256 B/op          1 allocs/op
BenchmarkPure_ParseAll            498306              2417 ns/op            4096 B/op         16 allocs/op
BenchmarkPure_StaticAll           219930              5225 ns/op               0 B/op          0 allocs/op

Licenses

• MIT License (MIT), Copyright (c) 2016 Dean Karn
• BSD License, Copyright (c) 2013 Julien Schmidt. All rights reserved.