compress's Introduction

Compress

Fast and easy-to-use compression package for Go applications.

Installation

The only requirement is the Go Programming Language.

$ go get github.com/kataras/compress

Getting Started

Import the package:

package main

import "github.com/kataras/compress"

Wrap a handler to enable writing and reading using the best offered compression:

import "net/http"

mux := http.NewServeMux()
// [...]
http.ListenAndServe(":8080", compress.Handler(mux))

Wrap any io.Writer for writing data using compression with NewWriter:

import "bytes"
import "encoding/json"

buf := new(bytes.Buffer)

w, err := compress.NewWriter(buf, compress.GZIP, -1)
if err != nil {
    panic(err)
}

json.NewEncoder(w).Encode(payload{Data: "my data"})

w.Close()

Wrap any io.Reader for reading compressed data with NewReader:

// Where resp.Body is an io.Reader.
r, err := compress.NewReader(resp.Body, compress.GZIP)
if err != nil {
    panic(err)
}
defer r.Close()

body, err := ioutil.ReadAll(r)

To retrieve the underline http.ResponseWriter please use w.(*compress.ResponseWriter).ResponseWriter.

Example Code:

import "net/http"

func handler(w http.ResponseWriter, r *http.Request) {
    target := "/your/asset.js"

	if pusher, ok := w.(*compress.ResponseWriter).ResponseWriter.(http.Pusher); ok {
		err := pusher.Push(target, &http.PushOptions{
            Header: http.Header{
                "Accept-Encoding": r.Header["Accept-Encoding"],
        }})
		if err != nil {
			if err == http.ErrNotSupported {
				http.Error(w, "HTTP/2 push not supported", http.StatusHTTPVersionNotSupported)
			} else {
				http.Error(w, err.Error(), http.StatusInternalServerError)
			}
			return
		}
    }
    
    // [...]
}