Esempio n. 1
0
// Gziper returns a Handler that adds gzip compression to all requests.
// Make sure to include the Gzip middleware above other middleware
// that alter the response body (like the render middleware).
func Gziper(options ...Options) macaron.Handler {
	opt := prepareOptions(options)

	return func(ctx *macaron.Context) {
		if !strings.Contains(ctx.Req.Header.Get(_HEADER_ACCEPT_ENCODING), "gzip") {
			return
		}

		headers := ctx.Resp.Header()
		headers.Set(_HEADER_CONTENT_ENCODING, "gzip")
		headers.Set(_HEADER_VARY, _HEADER_ACCEPT_ENCODING)

		// We've made sure compression level is valid in prepareGzipOptions,
		// no need to check same error again.
		gz, err := gzip.NewWriterLevel(ctx.Resp, opt.CompressionLevel)
		if err != nil {
			panic(err.Error())
		}
		defer gz.Close()

		gzw := gzipResponseWriter{gz, ctx.Resp}
		ctx.Resp = gzw
		ctx.MapTo(gzw, (*http.ResponseWriter)(nil))
		if ctx.Render != nil {
			ctx.Render.SetResponseWriter(gzw)
		}

		ctx.Next()

		// delete content length after we know we have been written to
		gzw.Header().Del("Content-Length")
	}
}
Esempio n. 2
0
// Gzip returns a handler which will handle the Gzip compression in ServeHTTP.
// Valid values for level are identical to those in the compress/gzip package.
func Gzip(level int) *handler {
	h := &handler{}
	h.pool.New = func() interface{} {
		gz, err := gzip.NewWriterLevel(ioutil.Discard, level)
		if err != nil {
			panic(err)
		}
		return gz
	}
	return h
}
Esempio n. 3
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// ServeHTTP wraps the http.ResponseWriter with a gzip.Writer.
func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
	// Skip compression if the client doesn't accept gzip encoding.
	if !strings.Contains(r.Header.Get(headerAcceptEncoding), encodingGzip) {
		next(w, r)
		return
	}

	// Skip compression if client attempt WebSocket connection
	if len(r.Header.Get(headerSecWebSocketKey)) > 0 {
		next(w, r)
		return
	}

	// Skip compression if already compressed
	if w.Header().Get(headerContentEncoding) == encodingGzip {
		next(w, r)
		return
	}

	// Create new gzip Writer. Skip compression if an invalid compression
	// level was set.
	gz, err := gzip.NewWriterLevel(w, h.compressionLevel)
	if err != nil {
		next(w, r)
		return
	}
	defer gz.Close()

	// Set the appropriate gzip headers.
	headers := w.Header()
	headers.Set(headerContentEncoding, encodingGzip)
	headers.Set(headerVary, headerAcceptEncoding)

	// Wrap the original http.ResponseWriter with negroni.ResponseWriter
	// and create the gzipResponseWriter.
	nrw := negroni.NewResponseWriter(w)
	grw := gzipResponseWriter{
		gz,
		nrw,
	}

	// Call the next handler supplying the gzipResponseWriter instead of
	// the original.
	next(grw, r)

	// Delete the content length after we know we have been written to.
	grw.Header().Del(headerContentLength)
}
Esempio n. 4
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func (_ Test) GZip() {

	var in bytes.Buffer

	w, _ := gzip.NewWriterLevel(&in, gzip.BestSpeed)
	w.Write(testData)
	w.Close()
	out := in.Bytes()
	e.InfoLog.Println("Result of Gzip compression", len(out))

	var in2 bytes.Buffer

	f, _ := flate.NewWriter(&in2, flate.BestSpeed)
	f.Write(testData)
	f.Close()
	out = in2.Bytes()
	e.InfoLog.Println("Result of Flate compression", len(out))
}
Esempio n. 5
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func Gzip(level int) gin.HandlerFunc {
	return func(c *gin.Context) {
		if !shouldCompress(c.Request) {
			return
		}
		gz, err := gzip.NewWriterLevel(c.Writer, level)
		if err != nil {
			return
		}

		c.Writer.Header().Set("Content-Encoding", "gzip")
		c.Writer.Header().Set("Vary", "Accept-Encoding")
		c.Writer = &gzipWriter{c.Writer, gz}
		defer func() {
			c.Writer.Header().Set("Content-Length", "")
			gz.Close()
		}()
		c.Next()
	}
}
Esempio n. 6
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func acquireGzipWriter(w io.Writer, level int) *gzipWriter {
	p := gzipWriterPoolMap[level]
	if p == nil {
		panic(fmt.Sprintf("BUG: unexpected compression level passed: %d. See compress/gzip for supported levels", level))
	}

	v := p.Get()
	if v == nil {
		zw, err := gzip.NewWriterLevel(w, level)
		if err != nil {
			panic(fmt.Sprintf("BUG: unexpected error from gzip.NewWriterLevel(%d): %s", level, err))
		}
		return &gzipWriter{
			Writer: zw,
			p:      p,
		}
	}
	zw := v.(*gzipWriter)
	zw.Reset(w)
	return zw
}
Esempio n. 7
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func NewWriterLevel(w io.Writer, level int) (*Writer, error) {
	z, err := gzip.NewWriterLevel(w, level)
	return (*Writer)(z), err
}