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github.com/nanmu42/gzip

Module github.com/nanmu42/gzip

v1.0.0
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Published: Apr 26, 2020 | License: MIT

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README

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Gzip Middleware for Go

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An out-of-the-box, also customizable gzip middleware for Gin and net/http.

Golang Gzip Middleware

Examples

Use DefaultHandler() to create a ready-to-go gzip middleware.

Gin

import github.com/nanmu42/gzip

func main() {
	g := gin.Default()

    // use default settings
	g.Use(gzip.DefaultHandler().Gin)

	g.GET("/", func(c *gin.Context) {
		c.JSON(http.StatusOK, map[string]interface{}{
			"code": 0,
			"msg":  "hello",
			"data": fmt.Sprintf("l%sng!", strings.Repeat("o", 1000)),
		})
	})

	log.Println(g.Run(fmt.Sprintf(":%d", 3000)))
}

net/http

import github.com/nanmu42/gzip

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		writeString(w, fmt.Sprintf("This content is compressed: l%sng!", strings.Repeat("o", 1000)))
	})

    // wrap http.Handler using default settings
	log.Println(http.ListenAndServe(fmt.Sprintf(":%d", 3001), gzip.DefaultHandler().WrapHandler(mux)))
}

func writeString(w http.ResponseWriter, payload string) {
	w.Header().Set("Content-Type", "text/plain; charset=utf8")
	_, _ = io.WriteString(w, payload+"\n")
}

Customize Handler

Handler can be customized using NewHandler and Config:

import github.com/nanmu42/gzip

handler := gzip.NewHandler(gzip.Config{
    // gzip compression level to use
	CompressionLevel: 6, 
    // minimum content length to trigger gzip, the unit is in byte.
	MinContentLength: 1024,
    // RequestFilter decide whether or not to compress response judging by request.
    // Filters are applied in the sequence here.
	RequestFilter: []RequestFilter{
	    NewCommonRequestFilter(),
	    DefaultExtensionFilter(),
	},
    // ResponseHeaderFilter decide whether or not to compress response
    // judging by response header
	ResponseHeaderFilter: []ResponseHeaderFilter{
		NewSkipCompressedFilter(),
		DefaultContentTypeFilter(),
	},
})

RequestFilter and ResponseHeaderFilter are interfaces. You may define one that specially suits your need.

Performance

This middleware is fine-tuned so that little overhead is added to your program. See benchmarks.

Limitation

  • You should always provide a Content-Type in http response’s header, though handler guesses by http.DetectContentType()as makeshift;
  • When Content-Length is not available, handler may buffer your writes to decide if its big enough to do a meaningful compression. A high MinContentLength may bring memory overhead, although the handler tries to be smart by reusing buffers and testing if len(data) of the first http.ResponseWriter.Write(data []byte) calling suffices or not.

Status: Stable

All APIs are finalized, and no breaking changes will be made in the 1.x series of releases.

Acknowledgement

During the development of this work, the author took following works/materials as reference:

License

MIT License
Copyright (c) 2019 LI Zhennan

Caddy is licensed under the Apache License
Copyright 2015 Light Code Labs, LLC
Source: github.com/nanmu42/gzip@v1.0.0/README.md