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logger.go
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logger.go
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// MIT license · Daniel T. Gorski · dtg [at] lengo [dot] org · 09/2019
package midas
import (
"io"
"net/http"
"strconv"
"sync"
"time"
)
type responseWriter struct {
wrap http.ResponseWriter
code int
sent int
}
var (
sink io.Writer
pipe, void = byte('|'), byte('-')
deli, zero = []byte{' ', pipe, ' '}, []byte("0.000")
bufPool = sync.Pool{New: func() interface{} { return new([0x200]byte) }}
escPool = sync.Pool{New: func() interface{} { return new([0x80]byte) }}
tlsVersion = map[uint16]string{
0x0300: "SSLv3.0",
0x0301: "TLSv1.0",
0x0302: "TLSv1.1",
0x0303: "TLSv1.2",
0x0304: "TLSv1.3",
0x0305: "TLSv1.4",
}
cipherSuite = map[uint16]string{
0x0005: "RSA-RC4-128-SHA",
0x000a: "RSA-3DES-EDE-CBC-SHA",
0x002f: "RSA-AES128-CBC-SHA",
0x0035: "RSA-AES256-CBC-SHA",
0x003c: "RSA-AES128-CBC-SHA256",
0x009c: "RSA-AES128-GCM-SHA256",
0x009d: "RSA-AES256-GCM-SHA384",
0xc007: "ECDHE-ECDSA-RC4-128-SHA",
0xc009: "ECDHE-ECDSA-AES128-CBC-SHA",
0xc00a: "ECDHE-ECDSA-AES256-CBC-SHA",
0xc011: "ECDHE-RSA-RC4-128-SHA",
0xc012: "ECDHE-RSA-3DES-EDE-CBC-SHA",
0xc013: "ECDHE-RSA-AES128-CBC-SHA",
0xc014: "ECDHE-RSA-AES256-CBC-SHA",
0xc023: "ECDHE-ECDSA-AES128-CBC-SHA256",
0xc027: "ECDHE-RSA-AES128-CBC-SHA256",
0xc02f: "ECDHE-RSA-AES128-GCM-SHA256",
0xc02b: "ECDHE-ECDSA-AES128-GCM-SHA256",
0xc030: "ECDHE-RSA-AES256-GCM-SHA384",
0xc02c: "ECDHE-ECDSA-AES256-GCM-SHA384",
0xcca8: "ECDHE-RSA-CHACHA20-POLY1305",
0xcca9: "ECDHE-ECDSA-CHACHA20-POLY1305",
0x1301: "AES128-GCM-SHA256",
0x1302: "AES256-GCM-SHA384",
0x1303: "CHACHA20-POLY1305-SHA256",
}
)
// Logger is a HTTP middleware decorator factory. This function returns
// an other function to be used to create a new response wrapper on demand.
func Logger(writer io.Writer) func(next http.Handler) http.Handler {
sink = writer
return newHandlerFunc
}
func newHandlerFunc(next http.Handler) http.Handler {
return http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
now := time.Now()
res := &responseWriter{wrap: w}
next.ServeHTTP(res, r)
buf := bufPool.Get().(*[0x200]byte)
b := buf[:0]
b = appendAccessTime(b, now) // $time_iso8601
b = appendRemoteAddr(b, r) // $remote_addr
b = appendRemoteUser(b, r) // $remote_user
b = appendRequest(b, r) // $request
b = appendStatus(b, res) // $status
b = appendReferer(b, r) // $http_referer
b = appendForwardedFor(b, r) // $http_x_forwarded_for
b = appendUserAgent(b, r) // $http_user_agent
b = appendSSLProtocol(b, r) // $ssl_protocol
b = appendSSLCipher(b, r) // $ssl_cipher
b = appendBytesSent(b, res) // $bytes_sent
b = appendRequestTime(b, now) // $request_time
b = appendRequestID(b, r) // $http_x_request_id
n := len(b) - len(deli)
b[n] = 0x0a
_, _ = sink.Write(b[:n+1])
bufPool.Put(buf)
},
)
}
func appendAccessTime(b []byte, t time.Time) []byte {
return append(append(b, t.AppendFormat(b, time.RFC3339)...), deli...)
}
func appendRemoteAddr(b []byte, r *http.Request) []byte {
for i := len(r.RemoteAddr) - 1; i >= 0; i-- {
if r.RemoteAddr[i] == ':' {
return append(append(b, r.RemoteAddr[:i]...), deli...)
}
}
return append(append(b, r.RemoteAddr...), deli...)
}
func appendRemoteUser(b []byte, r *http.Request) []byte {
if s, _, ok := r.BasicAuth(); ok {
return append(concat(b, s), deli...)
}
return append(append(b, void), deli...)
}
func appendRequest(b []byte, r *http.Request) []byte {
b = append(append(b, r.Method...), ' ')
b = append(concat(b, r.URL.Path), ' ')
return append(append(b, r.Proto...), deli...)
}
func appendStatus(b []byte, log *responseWriter) []byte {
return append(strconv.AppendInt(b, int64(log.code), 10), deli...)
}
func appendReferer(b []byte, r *http.Request) []byte {
if s := r.Header["Referer"]; s != nil {
return append(concat(b, s[0]), deli...)
}
return append(append(b, void), deli...)
}
func appendForwardedFor(b []byte, r *http.Request) []byte {
if s := r.Header["X-Forwarded-For"]; s != nil {
return append(concat(b, s[0]), deli...)
}
return append(append(b, void), deli...)
}
func appendUserAgent(b []byte, r *http.Request) []byte {
if s := r.Header["User-Agent"]; s != nil {
return append(concat(b, s[0]), deli...)
}
return append(append(b, void), deli...)
}
func appendSSLProtocol(b []byte, r *http.Request) []byte {
if r.TLS != nil {
if s, ok := tlsVersion[r.TLS.Version]; ok {
return append(append(b, s...), deli...)
}
}
return append(append(b, void), deli...)
}
func appendSSLCipher(b []byte, r *http.Request) []byte {
if r.TLS != nil {
if s, ok := cipherSuite[r.TLS.CipherSuite]; ok {
return append(append(b, s...), deli...)
}
}
return append(append(b, void), deli...)
}
func appendBytesSent(b []byte, log *responseWriter) []byte {
return append(strconv.AppendInt(b, int64(log.sent), 10), deli...)
}
func appendRequestTime(b []byte, t time.Time) []byte {
if d := time.Since(t).Seconds(); d >= .001 {
return append(strconv.AppendFloat(b, d, 'f', 3, 64), deli...)
}
return append(append(b, zero...), deli...)
}
func appendRequestID(b []byte, r *http.Request) []byte {
if s := r.Header["X-Request-Id"]; s != nil {
return append(concat(b, s[0]), deli...)
}
return append(append(b, void), deli...)
}
func (w *responseWriter) Header() http.Header {
return w.wrap.Header()
}
func (w *responseWriter) WriteHeader(code int) {
w.code = code
w.wrap.WriteHeader(code)
}
func (w *responseWriter) Write(buf []byte) (int, error) {
if w.code == 0 {
w.WriteHeader(http.StatusOK)
}
num, err := w.wrap.Write(buf)
w.sent += num
return num, err
}
func (w *responseWriter) Flush() {
if _, ok := w.wrap.(http.Flusher); ok {
w.wrap.(http.Flusher).Flush()
}
}
// Appends a string to byte buffer. Control characters below 0x20 and values
// above 0x7E are replaced by a period sign. The underlying buffer offers 128
// bytes capacity. This means, strings longer than 128 bytes will be cut off.
func concat(b []byte, s string) []byte {
esc := escPool.Get().(*[0x80]byte)
buf := esc[:]
for i, num := 0, copy(buf, s); i < num; i++ {
if buf[i] < 0x20 || buf[i] > 0x7E || buf[i] == pipe {
b = append(b, '.')
continue
}
b = append(b, buf[i])
}
escPool.Put(esc)
return b
}