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response_writer_wrapper.go
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/
response_writer_wrapper.go
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// Copyright 2023-2024 The aichat Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package web
import (
"bufio"
"errors"
"io"
"net"
"net/http"
)
var ErrPushNotImplemented = errors.New("push not implemented")
var ErrHijackNotImplemented = errors.New("hijack not implemented")
type ResponseWriterWrapper struct {
http.ResponseWriter
StatusCode int
ContentLength int
}
func NewResponseWriterWrapper(w http.ResponseWriter) *ResponseWriterWrapper {
return &ResponseWriterWrapper{ResponseWriter: w}
}
// Unwrap returns the underlying ResponseWriter.
func (rww *ResponseWriterWrapper) Unwrap() http.ResponseWriter {
return rww.ResponseWriter
}
// Flush implements http.Flusher. It simply calls the underlying
// ResponseWriter's Flush method if there is one.
func (rww *ResponseWriterWrapper) Flush() {
if f, ok := rww.ResponseWriter.(http.Flusher); ok {
f.Flush()
}
}
// Hijack implements http.Hijacker. It simply calls the underlying
// ResponseWriter's Hijack method if there is one, or returns
// ErrNotImplemented otherwise.
func (rww *ResponseWriterWrapper) Hijack() (net.Conn, *bufio.ReadWriter, error) {
if hj, ok := rww.ResponseWriter.(http.Hijacker); ok {
return hj.Hijack()
}
return nil, nil, ErrHijackNotImplemented
}
// Push implements http.Pusher. It simply calls the underlying
// ResponseWriter's Push method if there is one, or returns
// ErrNotImplemented otherwise.
func (rww *ResponseWriterWrapper) Push(target string, opts *http.PushOptions) error {
if pusher, ok := rww.ResponseWriter.(http.Pusher); ok {
return pusher.Push(target, opts)
}
return ErrPushNotImplemented
}
// ReadFrom implements io.ReaderFrom. It simply calls the underlying
// ResponseWriter's ReadFrom method if there is one, otherwise it defaults
// to io.Copy.
func (rww *ResponseWriterWrapper) ReadFrom(r io.Reader) (n int64, err error) {
if rf, ok := rww.ResponseWriter.(io.ReaderFrom); ok {
return rf.ReadFrom(r)
}
return io.Copy(rww.ResponseWriter, r)
}
// WriteHeader records the value of the status code before writing it.
func (rww *ResponseWriterWrapper) WriteHeader(code int) {
rww.StatusCode = code
rww.ResponseWriter.WriteHeader(code)
}
// Write computes the written len and stores it in ContentLength.
func (rww *ResponseWriterWrapper) Write(b []byte) (int, error) {
n, err := rww.ResponseWriter.Write(b)
rww.ContentLength += n
return n, err
}