/
writer2.go
464 lines (424 loc) · 10.7 KB
/
writer2.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
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
// SPDX-FileCopyrightText: 2022 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package db
import (
"encoding/binary"
"fmt"
"io"
"os"
"path"
"sort"
"strings"
"sync/atomic"
"time"
"github.com/gardener/network-problem-detector/pkg/common"
"github.com/gardener/network-problem-detector/pkg/common/nwpd"
"github.com/sirupsen/logrus"
"google.golang.org/protobuf/proto"
)
type obsWriter struct {
log logrus.FieldLogger
directory string
prefix string
retentionHours int
currentFile atomic.Value
obsChan chan *nwpd.Observation
done chan struct{}
ticker *time.Ticker
}
var _ nwpd.ObservationWriter = &obsWriter{}
const (
markerStringID = 1
markerObservation = 2
markerOpen = 127
)
type writeFile struct {
filename string
end time.Time
file *os.File
idMap *StringIDMap
}
var _ IntStringPersistor = &writeFile{}
func (wf *writeFile) Persist(obj *IntString) error {
raw := &nwpd.IntString{
Key: obj.Key(),
Value: obj.Value(),
}
bytes, err := proto.Marshal(raw)
if err != nil {
return err
}
return writeRecord(wf.file, markerStringID, bytes)
}
var _ nwpd.ObservationWriter = &obsWriter{}
func NewObsWriter(log logrus.FieldLogger, directory, prefix string, retentionHours int) (nwpd.ObservationWriter, error) {
err := os.MkdirAll(directory, 0o777)
if err != nil {
return nil, err
}
writer := &obsWriter{
log: log,
directory: directory,
prefix: prefix,
retentionHours: retentionHours,
obsChan: make(chan *nwpd.Observation, 100),
done: make(chan struct{}),
ticker: time.NewTicker(5 * time.Second),
}
return writer, nil
}
func (w *obsWriter) Add(obs *nwpd.Observation) {
w.obsChan <- obs
}
func (w *obsWriter) Stop() {
if w.ticker != nil {
w.ticker.Stop()
w.ticker = nil
}
w.done <- struct{}{}
file := w.currentFile.Load().(*writeFile)
if file != nil {
_ = file.file.Close()
}
}
func (w *obsWriter) Run() {
for {
select {
case <-w.done:
return
case <-w.ticker.C:
file, err := w.getFile()
if err != nil {
w.log.Warnf("sync failed: getFile: %s", err)
continue
}
err = file.file.Sync()
if err != nil {
w.log.Warnf("sync failed: %s", err)
continue
}
case obs := <-w.obsChan:
file, err := w.getFile()
if err != nil {
w.log.Warnf("write failed: getFile: %s", err)
continue
}
intobs, err := ToIntObservation(obs, file.idMap, file)
if err != nil {
w.log.Warnf("write failed: ToIntObservation: %s", err)
continue
}
value, err := IntObsToBytes(intobs)
if err != nil {
w.log.Warnf("write failed: IntObsToBytes: %s", err)
continue
}
if err := writeRecord(file.file, markerObservation, value); err != nil {
w.log.Warnf("write failed: %s", err)
continue
}
}
}
}
func writeRecord(w io.Writer, marker byte, value []byte) error {
if _, err := w.Write([]byte{marker}); err != nil {
return err
}
if err := binary.Write(w, binary.LittleEndian, uint16(len(value))); err != nil {
return err
}
if _, err := w.Write(value); err != nil {
return err
}
return nil
}
func readRecord(r io.Reader) (byte, []byte, error) {
marker := make([]byte, 1)
if n, err := r.Read(marker); err == io.EOF {
return 0, nil, nil
} else if err != nil {
return 0, nil, err
} else if n != 1 {
return 0, nil, fmt.Errorf("missing marker")
}
var length uint16
if err := binary.Read(r, binary.LittleEndian, &length); err != nil {
return 0, nil, err
}
value := make([]byte, length)
if n, err := r.Read(value); err != nil {
return 0, nil, err
} else if n != int(length) {
return 0, nil, fmt.Errorf("incomplete block: %d != %d", n, int(length))
}
return marker[0], value, nil
}
func (w *obsWriter) loadStringIDMap(filename string) (*StringIDMap, error) {
f, err := os.OpenFile(filename, os.O_RDONLY, 0o644)
if err != nil {
if os.IsNotExist(err) {
return NewStringIDMap(), nil
}
return nil, err
}
var objects []*IntString
for {
marker, value, err := readRecord(f)
if err != nil {
return nil, fmt.Errorf("reading StringIDMap failed: %s", err)
}
if value == nil {
break
}
switch marker {
case markerStringID:
raw := &nwpd.IntString{}
if err := proto.Unmarshal(value, raw); err != nil {
return nil, fmt.Errorf("reading StringIDMap from file %s failed: %s", filename, err)
}
obj := NewVarint2String(raw.Key, raw.Value)
objects = append(objects, obj)
case markerObservation:
// ignore
case markerOpen:
// ignore
default:
return nil, fmt.Errorf("invalid file format")
}
}
idMap := NewStringIDMapFromData(objects)
return idMap, nil
}
func (w *obsWriter) getFile() (*writeFile, error) {
now := time.Now().UTC()
var file *writeFile
if f, ok := w.currentFile.Load().(*writeFile); ok {
file = f
}
if file == nil || now.After(file.end) {
go func() {
w.cleanOldFiles()
}()
// rotate output file
if file != nil {
if err := file.file.Close(); err != nil {
w.log.Warnf("closing file %s failed: %s", file.filename, err)
}
}
currentUTC := startOfHourUTC(now)
next := now.Add(61 * time.Minute)
nextUTC := startOfHourUTC(next)
filename := fmt.Sprintf("%s/%s-%s.records", w.directory, w.prefix, currentUTC.Format("2006-01-02-15"))
idMap, err := w.loadStringIDMap(filename)
if err != nil {
return nil, err
}
f, err := os.OpenFile(filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
if err != nil {
return nil, err
}
err = writeRecord(f, markerOpen, []byte(now.UTC().Format("15:04:05")))
if err != nil {
return nil, err
}
file = &writeFile{
filename: filename,
end: nextUTC,
idMap: idMap,
file: f,
}
w.currentFile.Store(file)
}
return file, nil
}
func (w *obsWriter) cleanOldFiles() {
hours := w.retentionHours
if hours <= 0 {
hours = 1
}
limit := time.Now().Add(-time.Duration(hours) * time.Hour)
limitUTC := startOfHourUTC(limit)
files, err := os.ReadDir(w.directory)
if err != nil {
w.log.Warnf("cannot read directory %s: %s", w.directory, err)
return
}
for _, f := range files {
if !f.IsDir() && strings.HasPrefix(f.Name(), w.prefix) && isBefore(f, limitUTC) {
filename := path.Join(w.directory, f.Name())
if err := os.Remove(filename); err != nil {
w.log.Warnf("cannot delete file %s: %s", filename, err)
} else {
w.log.Infof("deleted file %s", filename)
}
}
}
}
func isBefore(entry os.DirEntry, limitUTC time.Time) bool {
fileInfo, err := entry.Info()
if err != nil {
return false
}
return fileInfo.ModTime().Before(limitUTC)
}
type filterFunc func(key string) bool
func all(_ string) bool { return true }
func createFilter(keys []string) filterFunc {
if keys == nil {
return all
}
m := common.StringSet{}
m.AddAll(keys...)
return m.Contains
}
func (w *obsWriter) ListObservations(options nwpd.ListObservationsOptions) (nwpd.Observations, error) {
var result nwpd.Observations
var empty time.Time
now := time.Now()
startLimit := now.Add(-24 * time.Hour)
start := options.Start
if start.After(now) {
start = now
} else if start.Before(startLimit) {
start = startLimit
}
end := options.End
if end == empty {
end = now
} else if end.After(start) || end.Before(startLimit) {
return nil, nil
}
limit := options.Limit
if limit == 0 {
limit = 10000
}
jobIDFilter := createFilter(options.FilterJobIDs)
srcHostFilter := createFilter(options.FilterSrcHosts)
descHostFilter := createFilter(options.FilterDestHosts)
files, err := GetRecordFiles(w.directory, w.prefix, start, end)
if err != nil {
return nil, err
}
for _, file := range files {
if len(result) == limit {
break
}
err := IterateRecordFile(file, func(obs *nwpd.Observation) error {
if len(result) == limit {
return nil
}
if t := obs.Timestamp.AsTime(); t.Before(start) || t.After(end) {
return nil
}
if obs.Ok && options.FailuresOnly {
return nil
}
if !jobIDFilter(obs.JobID) || !srcHostFilter(obs.SrcHost) || !descHostFilter(obs.DestHost) {
return nil
}
result = append(result, obs)
return nil
})
if err != nil {
return nil, err
}
}
sort.Sort(result)
return result, nil
}
func startOfHourUTC(t time.Time) time.Time {
t = t.UTC()
return time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), 0, 0, 0, t.Location())
}
// GetRecordFiles gets all observation record files.
func GetRecordFiles(directory, prefix string, start, end time.Time) ([]string, error) {
startHour := startOfHourUTC(start)
endHour := startOfHourUTC(end)
var files []string
for hour := startHour; !hour.After(endHour); hour = hour.Add(time.Hour) {
filename := fmt.Sprintf("%s/%s-%s.records", directory, prefix, hour.Format("2006-01-02-15"))
stat, err := os.Stat(filename)
if err != nil {
if os.IsNotExist(err) {
continue
}
return nil, err
}
if stat.IsDir() {
return nil, fmt.Errorf("%s is not a file", filename)
}
files = append(files, filename)
}
return files, nil
}
// GetAnyRecordFiles gets all observation record files.
func GetAnyRecordFiles(directory string, subdir bool) ([]string, error) {
entries, err := os.ReadDir(directory)
if err != nil {
return nil, err
}
var files []string
for _, entry := range entries {
if entry.IsDir() {
if subdir {
subfiles, err := GetAnyRecordFiles(path.Join(directory, entry.Name()), false)
if err != nil {
return nil, err
}
files = append(files, subfiles...)
}
continue
}
if !strings.HasSuffix(entry.Name(), ".records") {
continue
}
files = append(files, path.Join(directory, entry.Name()))
}
return files, nil
}
type ObservationVisitor func(obs *nwpd.Observation) error
func IterateRecordFile(filename string, visitor ObservationVisitor) error {
f, err := os.OpenFile(filename, os.O_RDONLY, 0o644)
if err != nil {
return err
}
idMap := NewStringIDMap()
for {
marker, value, err := readRecord(f)
if err != nil {
return err
}
if value == nil {
break
}
switch marker {
case markerStringID:
raw := &nwpd.IntString{}
if err := proto.Unmarshal(value, raw); err != nil {
return fmt.Errorf("error on reading StringIDMap: %s", err)
}
obj := NewVarint2String(raw.Key, raw.Value)
if err := idMap.Append(obj); err != nil {
return fmt.Errorf("error on appending to StringIDMap: %s", err)
}
case markerObservation:
intobs, err := IntObsFromBytes(value)
if err != nil {
return fmt.Errorf("error on unmarshalling: %s", err)
}
obs, err := IntObsToObservation(intobs, idMap)
if err != nil {
return fmt.Errorf("error on converting observation: %s", err)
}
if err := visitor(obs); err != nil {
return err
}
case markerOpen:
// ignore
default:
return fmt.Errorf("invalid file format")
}
}
return nil
}