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locked_writer.go
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locked_writer.go
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// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package gresponsewriter
import (
"bufio"
"net"
"net/http"
"sync"
)
var (
_ http.ResponseWriter = (*lockedWriter)(nil)
_ http.Flusher = (*lockedWriter)(nil)
_ http.Hijacker = (*lockedWriter)(nil)
)
type lockedWriter struct {
lock sync.Mutex
writer http.ResponseWriter
headerWritten bool
}
func NewLockedWriter(w http.ResponseWriter) http.ResponseWriter {
return &lockedWriter{writer: w}
}
func (lw *lockedWriter) Header() http.Header {
lw.lock.Lock()
defer lw.lock.Unlock()
return lw.writer.Header()
}
func (lw *lockedWriter) Write(b []byte) (int, error) {
lw.lock.Lock()
defer lw.lock.Unlock()
lw.headerWritten = true
return lw.writer.Write(b)
}
func (lw *lockedWriter) WriteHeader(statusCode int) {
lw.lock.Lock()
defer lw.lock.Unlock()
// Skip writing the header if it has already been written once.
if lw.headerWritten {
return
}
lw.headerWritten = true
lw.writer.WriteHeader(statusCode)
}
func (lw *lockedWriter) Flush() {
lw.lock.Lock()
defer lw.lock.Unlock()
flusher, ok := lw.writer.(http.Flusher)
if ok {
flusher.Flush()
}
}
func (lw *lockedWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
lw.lock.Lock()
defer lw.lock.Unlock()
hijacker, ok := lw.writer.(http.Hijacker)
if !ok {
return nil, nil, errUnsupportedHijacking
}
return hijacker.Hijack()
}