From 42f28ab8e374137fe3f5d25424489d879d4724f8 Mon Sep 17 00:00:00 2001
From: Christopher Speller <crspeller@gmail.com>
Date: Wed, 21 Jun 2017 19:06:17 -0700
Subject: Updating server dependancies (#6712)

---
 vendor/github.com/gorilla/websocket/compression.go | 73 +++++-----------------
 1 file changed, 15 insertions(+), 58 deletions(-)

(limited to 'vendor/github.com/gorilla/websocket/compression.go')

diff --git a/vendor/github.com/gorilla/websocket/compression.go b/vendor/github.com/gorilla/websocket/compression.go
index 813ffb1e8..72c166b2a 100644
--- a/vendor/github.com/gorilla/websocket/compression.go
+++ b/vendor/github.com/gorilla/websocket/compression.go
@@ -12,45 +12,31 @@ import (
 	"sync"
 )
 
-const (
-	minCompressionLevel     = -2 // flate.HuffmanOnly not defined in Go < 1.6
-	maxCompressionLevel     = flate.BestCompression
-	defaultCompressionLevel = 1
-)
-
 var (
-	flateWriterPools [maxCompressionLevel - minCompressionLevel + 1]sync.Pool
-	flateReaderPool  = sync.Pool{New: func() interface{} {
-		return flate.NewReader(nil)
-	}}
+	flateWriterPool = sync.Pool{}
 )
 
-func decompressNoContextTakeover(r io.Reader) io.ReadCloser {
+func decompressNoContextTakeover(r io.Reader) io.Reader {
 	const tail =
 	// Add four bytes as specified in RFC
 	"\x00\x00\xff\xff" +
 		// Add final block to squelch unexpected EOF error from flate reader.
 		"\x01\x00\x00\xff\xff"
-
-	fr, _ := flateReaderPool.Get().(io.ReadCloser)
-	fr.(flate.Resetter).Reset(io.MultiReader(r, strings.NewReader(tail)), nil)
-	return &flateReadWrapper{fr}
+	return flate.NewReader(io.MultiReader(r, strings.NewReader(tail)))
 }
 
-func isValidCompressionLevel(level int) bool {
-	return minCompressionLevel <= level && level <= maxCompressionLevel
-}
-
-func compressNoContextTakeover(w io.WriteCloser, level int) io.WriteCloser {
-	p := &flateWriterPools[level-minCompressionLevel]
+func compressNoContextTakeover(w io.WriteCloser) (io.WriteCloser, error) {
 	tw := &truncWriter{w: w}
-	fw, _ := p.Get().(*flate.Writer)
-	if fw == nil {
-		fw, _ = flate.NewWriter(tw, level)
+	i := flateWriterPool.Get()
+	var fw *flate.Writer
+	var err error
+	if i == nil {
+		fw, err = flate.NewWriter(tw, 3)
 	} else {
+		fw = i.(*flate.Writer)
 		fw.Reset(tw)
 	}
-	return &flateWriteWrapper{fw: fw, tw: tw, p: p}
+	return &flateWrapper{fw: fw, tw: tw}, err
 }
 
 // truncWriter is an io.Writer that writes all but the last four bytes of the
@@ -89,25 +75,24 @@ func (w *truncWriter) Write(p []byte) (int, error) {
 	return n + nn, err
 }
 
-type flateWriteWrapper struct {
+type flateWrapper struct {
 	fw *flate.Writer
 	tw *truncWriter
-	p  *sync.Pool
 }
 
-func (w *flateWriteWrapper) Write(p []byte) (int, error) {
+func (w *flateWrapper) Write(p []byte) (int, error) {
 	if w.fw == nil {
 		return 0, errWriteClosed
 	}
 	return w.fw.Write(p)
 }
 
-func (w *flateWriteWrapper) Close() error {
+func (w *flateWrapper) Close() error {
 	if w.fw == nil {
 		return errWriteClosed
 	}
 	err1 := w.fw.Flush()
-	w.p.Put(w.fw)
+	flateWriterPool.Put(w.fw)
 	w.fw = nil
 	if w.tw.p != [4]byte{0, 0, 0xff, 0xff} {
 		return errors.New("websocket: internal error, unexpected bytes at end of flate stream")
@@ -118,31 +103,3 @@ func (w *flateWriteWrapper) Close() error {
 	}
 	return err2
 }
-
-type flateReadWrapper struct {
-	fr io.ReadCloser
-}
-
-func (r *flateReadWrapper) Read(p []byte) (int, error) {
-	if r.fr == nil {
-		return 0, io.ErrClosedPipe
-	}
-	n, err := r.fr.Read(p)
-	if err == io.EOF {
-		// Preemptively place the reader back in the pool. This helps with
-		// scenarios where the application does not call NextReader() soon after
-		// this final read.
-		r.Close()
-	}
-	return n, err
-}
-
-func (r *flateReadWrapper) Close() error {
-	if r.fr == nil {
-		return io.ErrClosedPipe
-	}
-	err := r.fr.Close()
-	flateReaderPool.Put(r.fr)
-	r.fr = nil
-	return err
-}
-- 
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