forked from pingcap/sysutil
-
Notifications
You must be signed in to change notification settings - Fork 0
/
search_log.go
303 lines (281 loc) · 7.63 KB
/
search_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
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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
// Copyright 2019 PingCAP, Inc.
//
// Licensed 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package sysutil
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"regexp"
"sort"
"strings"
"time"
pb "github.com/pingcap/kvproto/pkg/diagnosticspb"
)
type logFile struct {
file *os.File // The opened file handle
begin, end int64 // The timesteamp in millisecond of first line
}
func (l *logFile) BeginTime() int64 {
return l.begin
}
func (l *logFile) EndTime() int64 {
return l.end
}
func resolveFiles(logFilePath string, beginTime, endTime int64) ([]logFile, error) {
if logFilePath == "" {
return nil, errors.New("empty log file location configuration")
}
var logFiles []logFile
var skipFiles []*os.File
logDir := filepath.Dir(logFilePath)
ext := filepath.Ext(logFilePath)
filePrefix := logFilePath[:len(logFilePath)-len(ext)]
err := filepath.Walk(logDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
// All rotated log files have the same prefix and extension with the original file
if !strings.HasPrefix(path, filePrefix) {
return nil
}
if !strings.HasSuffix(path, ext) {
return nil
}
// If we cannot open the file, we skip to search the file instead of returning
// error and abort entire searching task.
// TODO: do we need to return some warning to client?
file, err := os.OpenFile(path, os.O_RDONLY, os.ModePerm)
if err != nil {
return nil
}
reader := bufio.NewReader(file)
// Skip this file if cannot read the first line
firstLine, err := readLine(reader)
if err != nil && err != io.EOF {
skipFiles = append(skipFiles, file)
return nil
}
// Skip this file if the first line is not a valid log message
firstItem, err := parseLogItem(firstLine)
if err != nil {
skipFiles = append(skipFiles, file)
return nil
}
// Skip this file if cannot read the last line
lastLine := readLastLine(file)
// Skip this file if the last line is not a valid log message
lastItem, err := parseLogItem(lastLine)
if err != nil {
skipFiles = append(skipFiles, file)
return nil
}
// Reset position to the start and skip this file if cannot seek to start
if _, err := file.Seek(0, io.SeekStart); err != nil {
skipFiles = append(skipFiles, file)
return nil
}
if beginTime > lastItem.Time || endTime < firstItem.Time {
skipFiles = append(skipFiles, file)
} else {
logFiles = append(logFiles, logFile{
file: file,
begin: firstItem.Time,
end: lastItem.Time,
})
}
return nil
})
defer func() {
for _, f := range skipFiles {
_ = f.Close()
}
}()
// Sort by start time
sort.Slice(logFiles, func(i, j int) bool {
return logFiles[i].begin < logFiles[j].begin
})
return logFiles, err
}
// Read a line from a reader.
func readLine(reader *bufio.Reader) (string, error) {
var line, b []byte
var err error
isPrefix := true
for isPrefix {
b, isPrefix, err = reader.ReadLine()
line = append(line, b...)
if err != nil {
return "", err
}
}
return string(line), nil
}
func readLastLine(file *os.File) string {
var line []byte
var cursor int64
stat, _ := file.Stat()
filesize := stat.Size()
for {
cursor -= 1
file.Seek(cursor, io.SeekEnd)
char := make([]byte, 1)
file.Read(char)
// stop if we find a line
if cursor != -1 && (char[0] == 10 || char[0] == 13) {
break
}
line = append(line, char[0])
if cursor == -filesize { // stop if we are at the begining
break
}
}
for i, j := 0, len(line)-1; i < j; i, j = i+1, j-1 {
line[i], line[j] = line[j], line[i]
}
return string(line)
}
// Returns LogLevel from string and return LogLevel_Info if
// the string is an invalid level string
func ParseLogLevel(s string) pb.LogLevel {
switch s {
case "debug", "DEBUG":
return pb.LogLevel_Debug
case "info", "INFO":
return pb.LogLevel_Info
case "warn", "WARN":
return pb.LogLevel_Warn
case "trace", "TRACE":
return pb.LogLevel_Trace
case "critical", "CRITICAL":
return pb.LogLevel_Critical
case "error", "ERROR":
return pb.LogLevel_Error
default:
return pb.LogLevel_UNKNOWN
}
}
// parses single log line and returns:
// 1. the timesteamp in unix milliseconds
// 2. the log level
// 3. the log item content
//
// [2019/08/26 06:19:13.011 -04:00] [INFO] [printer.go:41] ["Welcome to TiDB."] ["Release Version"=v2.1.14]...
// [2019/08/26 07:19:49.529 -04:00] [INFO] [printer.go:41] ["Welcome to TiDB."] ["Release Version"=v3.0.2]...
// [2019/08/21 01:43:01.460 -04:00] [INFO] [util.go:60] [PD] [release-version=v3.0.2]
// [2019/08/26 07:20:23.815 -04:00] [INFO] [mod.rs:28] ["Release Version: 3.0.2"]
func parseLogItem(s string) (*pb.LogMessage, error) {
timeLeftBound := strings.Index(s, "[")
timeRightBound := strings.Index(s, "]")
if timeLeftBound == -1 || timeRightBound == -1 {
return nil, fmt.Errorf("invalid log string: %s", s)
}
time, err := parseTimeStamp(s[timeLeftBound+1 : timeRightBound])
if err != nil {
return nil, err
}
levelLeftBound := strings.Index(s[timeRightBound+1:], "[")
levelRightBound := strings.Index(s[timeRightBound+1:], "]")
level := ParseLogLevel(s[timeRightBound+1+levelLeftBound+1 : timeRightBound+1+levelRightBound])
item := &pb.LogMessage{
Time: time,
Level: level,
Message: strings.TrimSpace(s[timeRightBound+levelRightBound+2:]),
}
return item, nil
}
const TimeStampLayout = "2006/01/02 15:04:05.000 -07:00"
// TiDB / TiKV / PD unified log format
// [2019/03/04 17:04:24.614 +08:00] ...
func parseTimeStamp(s string) (int64, error) {
t, err := time.Parse(TimeStampLayout, s)
if err != nil {
return 0, err
}
return t.UnixNano() / int64(time.Millisecond), nil
}
// Only enable seek when position range is more than SEEK_THRESHOLD.
// The suggested value of SEEK_THRESHOLD is the biggest log size.
const SEEK_THRESHOLD = 1024 * 1024
// logIterator implements Iterator and IteratorWithPeek interface.
// It's used for reading logs from log files one by one by their
// time.
type logIterator struct {
// filters
begin int64
end int64
levelFlag int64
patterns []*regexp.Regexp
// inner state
fileIndex int
reader *bufio.Reader
pending []*os.File
}
// The Close method close all resources the iterator has.
func (iter *logIterator) close() {
for _, f := range iter.pending {
_ = f.Close()
}
}
func (iter *logIterator) next() (*pb.LogMessage, error) {
// initial state
if iter.reader == nil {
if len(iter.pending) == 0 {
return nil, io.EOF
}
iter.reader = bufio.NewReader(iter.pending[iter.fileIndex])
}
nextLine:
for {
line, err := readLine(iter.reader)
// Switch to next log file
if err != nil && err == io.EOF {
iter.fileIndex++
if iter.fileIndex >= len(iter.pending) {
return nil, io.EOF
}
iter.reader.Reset(iter.pending[iter.fileIndex])
continue
}
if len(line) < len(TimeStampLayout) {
continue
}
// Skip invalid log item
item, err := parseLogItem(line)
if err != nil {
continue
}
if item.Time > iter.end {
return nil, io.EOF
}
if item.Time < iter.begin {
continue
}
if iter.levelFlag != 0 && iter.levelFlag&(1<<item.Level) == 0 {
continue
}
if len(iter.patterns) > 0 {
for _, p := range iter.patterns {
if !p.MatchString(item.Message) {
continue nextLine
}
}
}
return item, nil
}
}