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// Copyright 2014 Google Inc. 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 httputil provides http utilities for stenographer.
package httputil
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"strings"
"time"
"github.com/google/stenographer/base"
"github.com/google/stenographer/stats"
)
// Context returns a new context.Content that cancels when the
// underlying http.ResponseWriter closes.
func Context(w http.ResponseWriter, r *http.Request, timeout time.Duration) base.Context {
ctx := base.NewContext(timeout)
if closer, ok := w.(http.CloseNotifier); ok {
go func() {
select {
case <-closer.CloseNotify():
log.Printf("Detected closed HTTP connection, canceling query")
ctx.Cancel()
case <-ctx.Done():
}
}()
}
return ctx
}
type httpLog struct {
r *http.Request
w http.ResponseWriter
nBytes int
code int
err error
start time.Time
body string
}
// New returns a new ResponseWriter which provides a nice
// String() method for easy printing. The expected usage is:
// func (h *myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// w = httputil.Log(w, r, false)
// defer log.Print(w) // Prints out useful information about request AND response
// ... do stuff ...
// }
func Log(w http.ResponseWriter, r *http.Request, logRequestBody bool) http.ResponseWriter {
h := &httpLog{w: w, r: r, start: time.Now(), code: http.StatusOK}
if logRequestBody {
var buf bytes.Buffer
_, h.err = io.Copy(&buf, r.Body)
r.Body.Close()
r.Body = ioutil.NopCloser(&buf)
h.body = fmt.Sprintf(" RequestBody:%q", buf.String())
}
return h
}
// Header implements http.ResponseWriter.
func (h *httpLog) Header() http.Header {
return h.w.Header()
}
// Write implements http.ResponseWriter and io.Writer.
func (h *httpLog) Write(data []byte) (int, error) {
n, err := h.w.Write(data)
h.nBytes += n
if err != nil && h.err == nil {
h.err = err
}
return n, err
}
// WriteHeader implements http.ResponseWriter.
func (h *httpLog) WriteHeader(code int) {
h.code = code
h.w.WriteHeader(code)
}
// String implements fmt.Stringer.
func (h *httpLog) String() string {
var errstr string
if h.err != nil {
errstr = h.err.Error()
}
duration := time.Since(h.start)
prefix := "http_request" + strings.Replace(h.r.URL.Path, "/", "_", -1) + "_" + h.r.Method + "_"
stats.S.Get(prefix + "completed").Increment()
stats.S.Get(prefix + "nanos").IncrementBy(duration.Nanoseconds())
stats.S.Get(prefix + "bytes").IncrementBy(int64(h.nBytes))
return fmt.Sprintf("Requester:%q Request:\"%v %v %v\" Time:%v Bytes:%v Code:%q Err:%q%v",
h.r.RemoteAddr,
h.r.Method,
h.r.URL,
h.r.Proto,
duration,
h.nBytes,
http.StatusText(h.code),
errstr,
h.body)
}
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