77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
package missinggo
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// todo move to httptoo as ResponseRecorder
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import (
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"bufio"
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"net"
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"net/http"
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"time"
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)
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// A http.ResponseWriter that tracks the status of the response. The status
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// code, and number of bytes written for example.
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type StatusResponseWriter struct {
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http.ResponseWriter
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Code int
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BytesWritten int64
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Started time.Time
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TimeToFirstByte time.Duration // Time to first byte
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GotFirstByte bool
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WroteHeader Event
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Hijacked bool
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}
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var _ interface {
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http.ResponseWriter
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http.Hijacker
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} = (*StatusResponseWriter)(nil)
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func (me *StatusResponseWriter) Write(b []byte) (n int, err error) {
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// Exactly how it's done in the standard library. This ensures Code is
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// correct.
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if !me.WroteHeader.IsSet() {
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me.WriteHeader(http.StatusOK)
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}
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if me.Started.IsZero() {
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panic("Started was not initialized")
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}
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timeBeforeWrite := time.Now()
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n, err = me.ResponseWriter.Write(b)
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if n > 0 && !me.GotFirstByte {
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me.TimeToFirstByte = timeBeforeWrite.Sub(me.Started)
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me.GotFirstByte = true
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}
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me.BytesWritten += int64(n)
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return
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}
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func (me *StatusResponseWriter) WriteHeader(code int) {
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me.ResponseWriter.WriteHeader(code)
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if !me.WroteHeader.IsSet() {
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me.Code = code
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me.WroteHeader.Set()
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}
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}
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func (me *StatusResponseWriter) Hijack() (c net.Conn, b *bufio.ReadWriter, err error) {
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me.Hijacked = true
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c, b, err = me.ResponseWriter.(http.Hijacker).Hijack()
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if b.Writer.Buffered() != 0 {
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panic("unexpected buffered writes")
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}
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c = responseConn{c, me}
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return
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}
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type responseConn struct {
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net.Conn
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s *StatusResponseWriter
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}
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func (me responseConn) Write(b []byte) (n int, err error) {
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n, err = me.Conn.Write(b)
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me.s.BytesWritten += int64(n)
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return
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}
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