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response-with-copy.go
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response-with-copy.go
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// Licensed to NASA JPL under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. NASA JPL licenses this file to you 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 endpoints
import (
"bufio"
"bytes"
"errors"
"net"
"net/http"
"strconv"
)
// ResponseWriterWithCopy - Acts like a normal http response writer but stores a copy
// of the written bytes/status, so it can be logged/monitored by a middleware component
type responseWriterWithCopy struct {
RealWriter http.ResponseWriter
Body *bytes.Buffer
Status int
}
func (w *responseWriterWithCopy) StatusText() string {
if w.Status == 0 {
return "OK"
}
return strconv.Itoa(w.Status)
}
func (w *responseWriterWithCopy) Header() http.Header {
return w.RealWriter.Header()
}
func (w *responseWriterWithCopy) Write(p []byte) (int, error) {
// Write to our own buffer AND the real one
w.Body.Write(p)
return w.RealWriter.Write(p)
}
func (w *responseWriterWithCopy) WriteHeader(statusCode int) {
w.Status = statusCode
w.RealWriter.WriteHeader(statusCode)
}
func (w *responseWriterWithCopy) Hijack() (net.Conn, *bufio.ReadWriter, error) {
h, ok := w.RealWriter.(http.Hijacker)
if !ok {
return nil, nil, errors.New("hijack not supported")
}
return h.Hijack()
}