93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
/*
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* Minimalist Object 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 logging
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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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"github.com/minio/minio/pkg/iodine"
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"github.com/minio/minio/pkg/utils/log"
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)
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type logHandler struct {
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http.Handler
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Logger chan<- string
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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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Request *http.Request
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StartTime time.Time
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Duration time.Duration
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Status int
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ResponseHeaders http.Header
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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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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.Status = status
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w.ResponseWriter.WriteHeader(status)
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w.ResponseWriter.Header()
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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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logMessage.ResponseHeaders = w.Header()
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logMessage.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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h.Logger <- string(js)
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}
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// LogHandler logs requests
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func LogHandler(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<- string, error) {
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ch := make(chan string)
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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, iodine.New(err, map[string]string{"logfile": filename})
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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.NewBufferString(message+"\n")); err != nil {
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log.Println(iodine.New(err, nil))
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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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