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109 lines
2.9 KiB
109 lines
2.9 KiB
/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"bytes"
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"encoding/json"
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"io"
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"net/http"
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"os"
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"time"
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)
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type logHandler struct {
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handler http.Handler
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logger chan<- []byte
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}
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// logMessage is a serializable json log message
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type logMessage struct {
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StartTime time.Time
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Duration time.Duration
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StatusMessage string // human readable http status message
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// HTTP detailed message
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HTTP struct {
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ResponseHeaders http.Header
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Request *http.Request
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}
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}
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// logWriter is used to capture status for log messages
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type logWriter struct {
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responseWriter http.ResponseWriter
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logMessage *logMessage
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}
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// WriteHeader writes headers and stores status in LogMessage
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func (w *logWriter) WriteHeader(status int) {
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w.logMessage.StatusMessage = http.StatusText(status)
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w.responseWriter.WriteHeader(status)
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}
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// Header Dummy wrapper for LogWriter
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func (w *logWriter) Header() http.Header {
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return w.responseWriter.Header()
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}
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// Write Dummy wrapper for LogWriter
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func (w *logWriter) Write(data []byte) (int, error) {
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return w.responseWriter.Write(data)
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}
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func (h *logHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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logMessage := &logMessage{
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StartTime: time.Now().UTC(),
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}
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logWriter := &logWriter{responseWriter: w, logMessage: logMessage}
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h.handler.ServeHTTP(logWriter, req)
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h.logger <- getLogMessage(logMessage, w, req)
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}
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func getLogMessage(logMessage *logMessage, w http.ResponseWriter, req *http.Request) []byte {
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// store lower level details
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logMessage.HTTP.ResponseHeaders = w.Header()
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logMessage.HTTP.Request = req
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logMessage.Duration = time.Now().UTC().Sub(logMessage.StartTime)
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js, _ := json.Marshal(logMessage)
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js = append(js, byte('\n')) // append a new line
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return js
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}
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// LoggingHandler logs requests
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func LoggingHandler(h http.Handler) http.Handler {
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logger, _ := fileLogger("access.log")
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return &logHandler{handler: h, logger: logger}
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}
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// fileLogger returns a channel that is used to write to the logger
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func fileLogger(filename string) (chan<- []byte, error) {
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ch := make(chan []byte)
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file, err := os.OpenFile(filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
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if err != nil {
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return nil, err
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}
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go func() {
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for message := range ch {
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if _, err := io.Copy(file, bytes.NewBuffer(message)); err != nil {
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// log.Errorln(err)
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}
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}
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}()
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return ch, nil
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}
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