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minio/accesslog-handler.go

120 lines
3.1 KiB

/*
* Minimalist Object Storage, (C) 2015 Minio, Inc.
*
* 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 main
import (
"encoding/json"
"net/http"
"net/url"
"os"
"time"
"github.com/minio/minio-xl/pkg/probe"
)
type accessLogHandler struct {
http.Handler
accessLogFile *os.File
}
// LogMessage is a serializable json log message
type LogMessage struct {
StartTime time.Time
Duration time.Duration
StatusMessage string // human readable http status message
ContentLength string // human readable content length
// HTTP detailed message
HTTP struct {
ResponseHeaders http.Header
Request struct {
Method string
URL *url.URL
Proto string // "HTTP/1.0"
ProtoMajor int // 1
ProtoMinor int // 0
Header http.Header
Host string
Form url.Values
PostForm url.Values
Trailer http.Header
RemoteAddr string
RequestURI string
}
}
}
func (h *accessLogHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
message, err := getLogMessage(w, req)
fatalIf(err.Trace(), "Unable to extract http message.", nil)
_, e := h.accessLogFile.Write(message)
fatalIf(probe.NewError(e), "Writing to log file failed.", nil)
h.Handler.ServeHTTP(w, req)
}
func getLogMessage(w http.ResponseWriter, req *http.Request) ([]byte, *probe.Error) {
logMessage := &LogMessage{
StartTime: time.Now().UTC(),
}
// store lower level details
logMessage.HTTP.ResponseHeaders = w.Header()
logMessage.HTTP.Request = struct {
Method string
URL *url.URL
Proto string // "HTTP/1.0"
ProtoMajor int // 1
ProtoMinor int // 0
Header http.Header
Host string
Form url.Values
PostForm url.Values
Trailer http.Header
RemoteAddr string
RequestURI string
}{
Method: req.Method,
URL: req.URL,
Proto: req.Proto,
ProtoMajor: req.ProtoMajor,
ProtoMinor: req.ProtoMinor,
Header: req.Header,
Host: req.Host,
Form: req.Form,
PostForm: req.PostForm,
Trailer: req.Header,
RemoteAddr: req.RemoteAddr,
RequestURI: req.RequestURI,
}
// logMessage.HTTP.Request = req
logMessage.Duration = time.Now().UTC().Sub(logMessage.StartTime)
js, e := json.Marshal(logMessage)
if e != nil {
return nil, probe.NewError(e)
}
js = append(js, byte('\n')) // append a new line
return js, nil
}
// setAccessLogHandler logs requests
func setAccessLogHandler(h http.Handler) http.Handler {
file, e := os.OpenFile("access.log", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
fatalIf(probe.NewError(e), "Unable to open access log.", nil)
return &accessLogHandler{Handler: h, accessLogFile: file}
}