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100 lines
2.5 KiB
100 lines
2.5 KiB
8 years ago
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package negroni
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import (
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"bufio"
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"fmt"
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"net"
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"net/http"
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)
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// ResponseWriter is a wrapper around http.ResponseWriter that provides extra information about
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// the response. It is recommended that middleware handlers use this construct to wrap a responsewriter
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// if the functionality calls for it.
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type ResponseWriter interface {
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http.ResponseWriter
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http.Flusher
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// Status returns the status code of the response or 200 if the response has
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// not been written (as this is the default response code in net/http)
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Status() int
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// Written returns whether or not the ResponseWriter has been written.
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Written() bool
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// Size returns the size of the response body.
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Size() int
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// Before allows for a function to be called before the ResponseWriter has been written to. This is
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// useful for setting headers or any other operations that must happen before a response has been written.
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Before(func(ResponseWriter))
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}
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type beforeFunc func(ResponseWriter)
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// NewResponseWriter creates a ResponseWriter that wraps an http.ResponseWriter
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func NewResponseWriter(rw http.ResponseWriter) ResponseWriter {
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return &responseWriter{
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ResponseWriter: rw,
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}
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}
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type responseWriter struct {
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http.ResponseWriter
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status int
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size int
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beforeFuncs []beforeFunc
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}
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func (rw *responseWriter) WriteHeader(s int) {
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rw.status = s
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rw.callBefore()
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rw.ResponseWriter.WriteHeader(s)
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}
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func (rw *responseWriter) Write(b []byte) (int, error) {
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if !rw.Written() {
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// The status will be StatusOK if WriteHeader has not been called yet
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rw.WriteHeader(http.StatusOK)
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}
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size, err := rw.ResponseWriter.Write(b)
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rw.size += size
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return size, err
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}
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func (rw *responseWriter) Status() int {
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return rw.status
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}
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func (rw *responseWriter) Size() int {
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return rw.size
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}
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func (rw *responseWriter) Written() bool {
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return rw.status != 0
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}
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func (rw *responseWriter) Before(before func(ResponseWriter)) {
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rw.beforeFuncs = append(rw.beforeFuncs, before)
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}
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func (rw *responseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
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hijacker, ok := rw.ResponseWriter.(http.Hijacker)
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if !ok {
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return nil, nil, fmt.Errorf("the ResponseWriter doesn't support the Hijacker interface")
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}
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return hijacker.Hijack()
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}
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func (rw *responseWriter) CloseNotify() <-chan bool {
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return rw.ResponseWriter.(http.CloseNotifier).CloseNotify()
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}
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func (rw *responseWriter) callBefore() {
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for i := len(rw.beforeFuncs) - 1; i >= 0; i-- {
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rw.beforeFuncs[i](rw)
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}
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}
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func (rw *responseWriter) Flush() {
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flusher, ok := rw.ResponseWriter.(http.Flusher)
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if ok {
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flusher.Flush()
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}
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}
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