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logger.go
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logger.go
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package main
import (
"io"
"strconv"
"unicode/utf8"
"github.com/gorilla/handlers"
)
func ProxyFormatter(writer io.Writer, params handlers.LogFormatterParams) {
username := params.Request.Header.Get("X-korbinsky-username")
if username == "" {
username = "-"
}
req := params.Request
url := params.URL
ts := params.TimeStamp
status := params.StatusCode
size := params.Size
host := params.Request.Header.Get("X-Real-IP")
//proxy := fmt.Sprintf("%s, %s", req.RemoteAddr, req.Header.Get("X-Forwarded-For"))
uri := req.RequestURI
if req.ProtoMajor == 2 && req.Method == "CONNECT" {
uri = req.Host
}
if uri == "" {
uri = url.RequestURI()
}
buf := make([]byte, 0, 3*(len(host)+len(username)+len(req.Method)+len(uri)+len(req.Proto)+50)/2)
buf = append(buf, host...)
buf = append(buf, " - "...)
buf = append(buf, username...)
buf = append(buf, " ["...)
buf = append(buf, ts.Format("02/Jan/2006:15:04:05 -0700")...)
buf = append(buf, `] "`...)
buf = append(buf, req.Method...)
buf = append(buf, " "...)
buf = appendQuoted(buf, uri)
buf = append(buf, " "...)
buf = append(buf, req.Proto...)
buf = append(buf, `" `...)
buf = append(buf, strconv.Itoa(status)...)
buf = append(buf, " "...)
buf = append(buf, strconv.Itoa(size)...)
buf = append(buf, "\n"...)
writer.Write(buf)
}
const lowerhex = "0123456789abcdef"
func appendQuoted(buf []byte, s string) []byte {
var runeTmp [utf8.UTFMax]byte
for width := 0; len(s) > 0; s = s[width:] {
r := rune(s[0])
width = 1
if r >= utf8.RuneSelf {
r, width = utf8.DecodeRuneInString(s)
}
if width == 1 && r == utf8.RuneError {
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[s[0]>>4])
buf = append(buf, lowerhex[s[0]&0xF])
continue
}
if r == rune('"') || r == '\\' { // always backslashed
buf = append(buf, '\\')
buf = append(buf, byte(r))
continue
}
if strconv.IsPrint(r) {
n := utf8.EncodeRune(runeTmp[:], r)
buf = append(buf, runeTmp[:n]...)
continue
}
switch r {
case '\a':
buf = append(buf, `\a`...)
case '\b':
buf = append(buf, `\b`...)
case '\f':
buf = append(buf, `\f`...)
case '\n':
buf = append(buf, `\n`...)
case '\r':
buf = append(buf, `\r`...)
case '\t':
buf = append(buf, `\t`...)
case '\v':
buf = append(buf, `\v`...)
default:
switch {
case r < ' ':
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[s[0]>>4])
buf = append(buf, lowerhex[s[0]&0xF])
case r > utf8.MaxRune:
r = 0xFFFD
fallthrough
case r < 0x10000:
buf = append(buf, `\u`...)
for s := 12; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
default:
buf = append(buf, `\U`...)
for s := 28; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
}
}
}
return buf
}