-
Notifications
You must be signed in to change notification settings - Fork 28
/
log.go
175 lines (153 loc) · 3.21 KB
/
log.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
package main
import (
"fmt"
"io"
"log"
"net/http"
"os"
"time"
"github.com/elazarl/goproxy"
)
const (
AppendLog int = iota
ReopenLog int = iota
)
var (
emptyResp = &http.Response{}
emptyReq = &http.Request{}
)
type LogData struct {
action int
req *http.Request
resp *http.Response
user string
err error
time time.Time
}
type ProxyLogger struct {
path string
logChannel chan *LogData
errorChannel chan error
}
func fprintf(nr *int64, err *error, w io.Writer, pat string, a ...interface{}) {
if *err != nil {
return
}
var n int
n, *err = fmt.Fprintf(w, pat, a...)
*nr += int64(n)
}
func getAuthenticatedUserName(ctx *goproxy.ProxyCtx) string {
user, ok := ctx.UserData.(string)
if !ok {
user = "-"
}
return user
}
func (m *LogData) writeTo(w io.Writer) (nr int64, err error) {
if m.resp != nil {
if m.resp.Request != nil {
fprintf(&nr, &err, w,
"%v %v %v %v %v %v %v\n",
m.time.Format(time.RFC3339),
m.resp.Request.RemoteAddr,
m.resp.Request.Method,
m.resp.Request.URL,
m.resp.StatusCode,
m.resp.ContentLength,
m.user)
} else {
fprintf(&nr, &err, w,
"%v %v %v %v %v %v %v\n",
m.time.Format(time.RFC3339),
"-",
"-",
"-",
m.resp.StatusCode,
m.resp.ContentLength,
m.user)
}
} else if m.req != nil {
fprintf(&nr, &err, w,
"%v %v %v %v %v %v %v\n",
m.time.Format(time.RFC3339),
m.req.RemoteAddr,
m.req.Method,
m.req.URL,
"-",
"-",
m.user)
}
return
}
func newProxyLogger(conf *Configuration) *ProxyLogger {
var fh *os.File
if conf.AccessLog != "" {
var err error
fh, err = os.OpenFile(conf.AccessLog, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0o600)
if err != nil {
log.Fatalf("Couldn't open log file: %v", err)
}
}
logger := &ProxyLogger{
path: conf.AccessLog,
logChannel: make(chan *LogData),
errorChannel: make(chan error),
}
go func() {
for m := range logger.logChannel {
if fh != nil {
switch m.action {
case AppendLog:
if _, err := m.writeTo(fh); err != nil {
log.Println("Can't write meta", err)
}
case ReopenLog:
err := fh.Close()
if err != nil {
log.Fatal(err)
}
fh, err = os.OpenFile(conf.AccessLog, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0o600)
if err != nil {
log.Fatalf("Couldn't reopen log file: %v", err)
}
}
}
}
logger.errorChannel <- fh.Close()
}()
return logger
}
func (logger *ProxyLogger) logResponse(resp *http.Response, ctx *goproxy.ProxyCtx) {
if resp == nil {
resp = emptyResp
}
logger.writeLogEntry(&LogData{
action: AppendLog,
resp: resp,
user: getAuthenticatedUserName(ctx),
err: ctx.Error,
time: time.Now(),
})
}
func (logger *ProxyLogger) writeLogEntry(data *LogData) {
logger.logChannel <- data
}
func (logger *ProxyLogger) log(ctx *goproxy.ProxyCtx) {
data := &LogData{
action: AppendLog,
req: ctx.Req,
resp: ctx.Resp,
user: getAuthenticatedUserName(ctx),
err: ctx.Error,
time: time.Now(),
}
logger.writeLogEntry(data)
}
func (logger *ProxyLogger) close() error {
close(logger.logChannel)
return <-logger.errorChannel
}
func (logger *ProxyLogger) reopen() {
logger.writeLogEntry(&LogData{action: ReopenLog})
}