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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package rotatingfilewriter
import (
"bufio"
"compress/gzip"
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"time"
"code.gitea.io/gitea/modules/graceful/releasereopen"
"code.gitea.io/gitea/modules/util"
)
type Options struct {
Rotate bool
MaximumSize int64
RotateDaily bool
KeepDays int
Compress bool
CompressionLevel int
}
type RotatingFileWriter struct {
mu sync.Mutex
fd *os.File
currentSize int64
openDate int
options Options
cancelReleaseReopen func()
}
var ErrorPrintf func(format string, args ...any)
// errorf tries to print error messages. Since this writer could be used by a logger system, this is the last chance to show the error in some cases
func errorf(format string, args ...any) {
if ErrorPrintf != nil {
ErrorPrintf("rotatingfilewriter: "+format+"\n", args...)
}
}
// Open creates a new rotating file writer.
// Notice: if a file is opened by two rotators, there will be conflicts when rotating.
// In the future, there should be "rotating file manager"
func Open(filename string, options *Options) (*RotatingFileWriter, error) {
if options == nil {
options = &Options{}
}
rfw := &RotatingFileWriter{
options: *options,
}
if err := rfw.open(filename); err != nil {
return nil, err
}
rfw.cancelReleaseReopen = releasereopen.GetManager().Register(rfw)
return rfw, nil
}
func (rfw *RotatingFileWriter) Write(b []byte) (int, error) {
if rfw.options.Rotate && ((rfw.options.MaximumSize > 0 && rfw.currentSize >= rfw.options.MaximumSize) || (rfw.options.RotateDaily && time.Now().Day() != rfw.openDate)) {
if err := rfw.DoRotate(); err != nil {
// if this writer is used by a logger system, it's the logger system's responsibility to handle/show the error
return 0, err
}
}
n, err := rfw.fd.Write(b)
if err == nil {
rfw.currentSize += int64(n)
}
return n, err
}
func (rfw *RotatingFileWriter) Flush() error {
return rfw.fd.Sync()
}
func (rfw *RotatingFileWriter) Close() error {
rfw.mu.Lock()
if rfw.cancelReleaseReopen != nil {
rfw.cancelReleaseReopen()
rfw.cancelReleaseReopen = nil
}
rfw.mu.Unlock()
return rfw.fd.Close()
}
func (rfw *RotatingFileWriter) open(filename string) error {
fd, err := os.OpenFile(filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0o660)
if err != nil {
return err
}
rfw.fd = fd
finfo, err := fd.Stat()
if err != nil {
return err
}
rfw.currentSize = finfo.Size()
rfw.openDate = finfo.ModTime().Day()
return nil
}
func (rfw *RotatingFileWriter) ReleaseReopen() error {
return errors.Join(
rfw.fd.Close(),
rfw.open(rfw.fd.Name()),
)
}
// DoRotate the log file creating a backup like xx.2013-01-01.2
func (rfw *RotatingFileWriter) DoRotate() error {
if !rfw.options.Rotate {
return nil
}
rfw.mu.Lock()
defer rfw.mu.Unlock()
prefix := fmt.Sprintf("%s.%s.", rfw.fd.Name(), time.Now().Format("2006-01-02"))
var err error
fname := ""
for i := 1; err == nil && i <= 999; i++ {
fname = prefix + fmt.Sprintf("%03d", i)
_, err = os.Lstat(fname)
if rfw.options.Compress && err != nil {
_, err = os.Lstat(fname + ".gz")
}
}
// return error if the last file checked still existed
if err == nil {
return fmt.Errorf("cannot find free file to rename %s", rfw.fd.Name())
}
fd := rfw.fd
if err := fd.Close(); err != nil { // close file before rename
return err
}
if err := util.Rename(fd.Name(), fname); err != nil {
return err
}
if rfw.options.Compress {
go func() {
err := compressOldFile(fname, rfw.options.CompressionLevel)
if err != nil {
errorf("DoRotate: %v", err)
}
}()
}
if err := rfw.open(fd.Name()); err != nil {
return err
}
go deleteOldFiles(
filepath.Dir(fd.Name()),
filepath.Base(fd.Name()),
time.Now().AddDate(0, 0, -rfw.options.KeepDays),
)
return nil
}
func compressOldFile(fname string, compressionLevel int) error {
reader, err := os.Open(fname)
if err != nil {
return fmt.Errorf("compressOldFile: failed to open existing file %s: %w", fname, err)
}
defer reader.Close()
buffer := bufio.NewReader(reader)
fnameGz := fname + ".gz"
fw, err := os.OpenFile(fnameGz, os.O_WRONLY|os.O_CREATE, 0o660)
if err != nil {
return fmt.Errorf("compressOldFile: failed to open new file %s: %w", fnameGz, err)
}
defer fw.Close()
zw, err := gzip.NewWriterLevel(fw, compressionLevel)
if err != nil {
return fmt.Errorf("compressOldFile: failed to create gzip writer: %w", err)
}
defer zw.Close()
_, err = buffer.WriteTo(zw)
if err != nil {
_ = zw.Close()
_ = fw.Close()
_ = util.Remove(fname + ".gz")
return fmt.Errorf("compressOldFile: failed to write to gz file: %w", err)
}
_ = reader.Close()
err = util.Remove(fname)
if err != nil {
return fmt.Errorf("compressOldFile: failed to delete old file: %w", err)
}
return nil
}
func deleteOldFiles(dir, prefix string, removeBefore time.Time) {
err := filepath.WalkDir(dir, func(path string, d os.DirEntry, err error) (returnErr error) {
defer func() {
if r := recover(); r != nil {
returnErr = fmt.Errorf("unable to delete old file '%s', error: %+v", path, r)
}
}()
if err != nil {
return err
}
if d.IsDir() {
return nil
}
info, err := d.Info()
if err != nil {
return err
}
if info.ModTime().Before(removeBefore) {
if strings.HasPrefix(filepath.Base(path), prefix) {
return util.Remove(path)
}
}
return nil
})
if err != nil {
errorf("deleteOldFiles: failed to delete old file: %v", err)
}
}
|
