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access_log.go
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access_log.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you 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 middleware
import (
"fmt"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/gin-gonic/gin"
"github.com/lindb/lindb/pkg/logger"
)
// for testing
var (
pathUnescapeFunc = url.PathUnescape
)
// AccessLog returns access log middleware
func AccessLog() gin.HandlerFunc {
return func(c *gin.Context) {
start := time.Now()
r := c.Request
defer func() {
// add access log
path := r.RequestURI
unescapedPath, err := pathUnescapeFunc(path)
if err != nil {
unescapedPath = path
}
status := c.Writer.Status()
errors := c.Errors
// http://httpd.apache.org/docs/1.3/logs.html?PHPSESSID=026558d61a93eafd6da3438bb9605d4d#common
requestInfo := realIP(r) + " " + time.Since(start).String() +
" \"" + r.Method + " " + unescapedPath + " " + r.Proto + "\" " +
strconv.Itoa(status) + " " + strconv.Itoa(c.Writer.Size())
if len(errors) > 0 {
errMsg := fmt.Sprintf(" %v", errors)
requestInfo += strings.TrimRight(errMsg, "\n")
}
if status >= 400 {
logger.AccessLog.Error(requestInfo)
} else {
logger.AccessLog.Debug(requestInfo)
}
}()
c.Next()
}
}
// realIP return the real ip
func realIP(r *http.Request) string {
xRealIP := r.Header.Get("X-Real-Ip")
if xRealIP != "" {
return xRealIP
}
xForwardedFor := r.Header.Get("X-Forwarded-For")
for _, address := range strings.Split(xForwardedFor, ",") {
address = strings.TrimSpace(address)
if address != "" {
return address
}
}
ip, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
return r.RemoteAddr
}
return ip
}