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
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
|
package main
import (
"bufio"
"bytes"
"context"
"crypto/sha1"
"database/sql"
"encoding/hex"
"errors"
"fmt"
"html/template"
"io"
"io/fs"
"log"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strconv"
"strings"
"sync"
"time"
_ "github.com/mattn/go-sqlite3"
"golang.org/x/sync/semaphore"
)
var (
db *sql.DB // sqlite database
galleryDirectory string // gallery directory
// taskSemaphore limits parallel computations.
taskSemaphore *semaphore.Weighted
)
func openDB(directory string) error {
var err error
db, err = sql.Open("sqlite3", "file:"+filepath.Join(directory,
"gallery.db?_foreign_keys=1&_busy_timeout=1000"))
galleryDirectory = directory
return err
}
func imagePath(sha1 string) string {
return filepath.Join(galleryDirectory, "images", sha1[:2], sha1)
}
func thumbPath(sha1 string) string {
return filepath.Join(galleryDirectory, "thumbs", sha1[:2], sha1+".webp")
}
func dbCollectStrings(query string) ([]string, error) {
rows, err := db.Query(query)
if err != nil {
return nil, err
}
defer rows.Close()
var result []string
for rows.Next() {
var s string
if err := rows.Scan(&s); err != nil {
return nil, err
}
result = append(result, s)
}
if err := rows.Err(); err != nil {
return nil, err
}
return result, nil
}
// --- Progress bar ------------------------------------------------------------
type progressBar struct {
mutex sync.Mutex
current int
target int
}
func newProgressBar(target int) *progressBar {
pb := &progressBar{current: 0, target: target}
pb.update()
return pb
}
func (pb *progressBar) Stop() {
// The minimum thing that works: just print a newline.
os.Stdout.WriteString("\n")
}
func (pb *progressBar) update() {
target := fmt.Sprintf("%d", pb.target)
fmt.Printf("\r%*d/%s (%2d%%)", len(target), pb.current, target,
int(float32(pb.current)/float32(pb.target)*100))
}
func (pb *progressBar) Step() {
pb.mutex.Lock()
defer pb.mutex.Unlock()
pb.current++
pb.update()
}
// --- Initialization ----------------------------------------------------------
// cmdInit initializes a "gallery directory" that contains gallery.sqlite,
// images, thumbs.
func cmdInit(args []string) error {
if len(args) != 1 {
return errors.New("usage: GD")
}
if err := openDB(args[0]); err != nil {
return err
}
if _, err := db.Exec(initializeSQL); err != nil {
return err
}
// XXX: There's technically no reason to keep images as symlinks,
// we might just keep absolute paths in the database as well.
if err := os.MkdirAll(
filepath.Join(galleryDirectory, "images"), 0755); err != nil {
return err
}
if err := os.MkdirAll(
filepath.Join(galleryDirectory, "thumbs"), 0755); err != nil {
return err
}
return nil
}
// --- Web ---------------------------------------------------------------------
var hashRE = regexp.MustCompile(`^/.*?/([0-9a-f]{40})$`)
var staticHandler http.Handler
var page = template.Must(template.New("/").Parse(`<!DOCTYPE html><html><head>
<title>Gallery</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel=stylesheet href=style.css>
</head><body>
<h1>{{ .Name }}</h1>
<ul>
{{ range .Children }}
<li><a href="?id={{ . }}">{{ . }}</a></li>
{{ end }}
</ul>
{{ range .Entries }}
<a href="/image/{{ .Sha1 }}">
<img width={{ .Thumbw }} height={{ .Thumbh }} src="/thumb/{{ .Sha1 }}"
title="{{ .Name }}">
</a>
{{ end }}
<script src=gallery.js></script>
</body></html>`))
// XXX: This is preliminary.
type entry struct {
Parent int64
Name string
Mtime int64
Sha1 string
Thumbw int
Thumbh int
Dhash int64
}
// XXX: This is preliminary.
type directory struct {
Id int64
Name string
Parent int64
Children []int64
Entries []entry
}
func dbCollectDirectory(id int64) (directory, error) {
d := directory{Id: id}
dbID := sql.NullInt64{Int64: id, Valid: id != 0}
if id != 0 {
err := db.QueryRow(`SELECT name, IFNULL(parent, 0)
FROM directory WHERE id IS ?`, dbID).Scan(&d.Name, &d.Parent)
if err != nil {
return d, err
}
}
rows1, err := db.Query(`SELECT id FROM directory WHERE parent IS ?`, dbID)
if err != nil {
return d, err
}
defer rows1.Close()
for rows1.Next() {
var child int64
if err := rows1.Scan(&child); err != nil {
return d, err
}
d.Children = append(d.Children, child)
}
if err := rows1.Err(); err != nil {
return d, err
}
rows2, err := db.Query(`SELECT IFNULL(entry.parent, 0),
entry.name, entry.mtime, entry.sha1,
IFNULL(image.thumbw, 0), IFNULL(image.thumbh, 0), IFNULL(image.dhash, 0)
FROM entry JOIN image ON entry.sha1 = image.sha1
WHERE entry.parent IS ?`, dbID)
if err != nil {
return d, err
}
defer rows2.Close()
for rows2.Next() {
var e entry
if err := rows2.Scan(&e.Parent, &e.Name, &e.Mtime, &e.Sha1,
&e.Thumbw, &e.Thumbh, &e.Dhash); err != nil {
return d, err
}
d.Entries = append(d.Entries, e)
}
return d, rows2.Err()
}
func handleRequest(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
staticHandler.ServeHTTP(w, r)
return
}
id, _ := strconv.ParseInt(r.URL.Query().Get("id"), 10, 64)
d, err := dbCollectDirectory(id)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
if err := page.Execute(w, d); err != nil {
log.Println(err)
}
}
func handleImages(w http.ResponseWriter, r *http.Request) {
if m := hashRE.FindStringSubmatch(r.URL.Path); m == nil {
http.NotFound(w, r)
} else {
http.ServeFile(w, r, imagePath(m[1]))
}
}
func handleThumbs(w http.ResponseWriter, r *http.Request) {
if m := hashRE.FindStringSubmatch(r.URL.Path); m == nil {
http.NotFound(w, r)
} else {
http.ServeFile(w, r, thumbPath(m[1]))
}
}
// cmdRun runs a web UI against GD on ADDRESS.
func cmdRun(args []string) error {
if len(args) != 2 {
return errors.New("usage: GD ADDRESS")
}
if err := openDB(args[0]); err != nil {
return err
}
address := args[1]
// This separation is not strictly necessary,
// but having an elementary level of security doesn't hurt either.
staticHandler = http.FileServer(http.Dir("public"))
// TODO: Make sure the database handle isn't used concurrently.
http.HandleFunc("/", handleRequest)
http.HandleFunc("/image/", handleImages)
http.HandleFunc("/thumb/", handleThumbs)
// TODO: Add a few API endpoints.
host, port, err := net.SplitHostPort(address)
if err != nil {
log.Println(err)
} else if host == "" {
log.Println("http://" + net.JoinHostPort("localhost", port))
} else {
log.Println("http://" + address)
}
s := &http.Server{
Addr: address,
ReadTimeout: 60 * time.Second,
WriteTimeout: 60 * time.Second,
MaxHeaderBytes: 32 << 10,
}
return s.ListenAndServe()
}
// --- Import ------------------------------------------------------------------
type directoryManager struct {
cache map[string]int64 // Unix-style paths to directory.id
}
func (dm *directoryManager) uncachedIDForPath(
tx *sql.Tx, path []string) (int64, error) {
var parent sql.NullInt64
for _, name := range path {
if err := tx.QueryRow(
`SELECT id FROM directory WHERE name = ? AND parent IS ?`,
name, parent).Scan(&parent); err == nil {
continue
} else if !errors.Is(err, sql.ErrNoRows) {
return 0, err
}
if result, err := tx.Exec(
`INSERT INTO directory(name, parent) VALUES (?, ?)`,
name, parent); err != nil {
return 0, err
} else if id, err := result.LastInsertId(); err != nil {
return 0, err
} else {
parent = sql.NullInt64{Int64: id, Valid: true}
}
}
return parent.Int64, nil
}
func (dm *directoryManager) IDForDirectoryPath(
tx *sql.Tx, path string) (int64, error) {
// Relative paths could be handled differently,
// but right now, they're assumed to start at the root.
path = filepath.ToSlash(filepath.Clean(path))
list := strings.Split(path, "/")
if len(list) > 1 && list[0] == "" {
list = list[1:]
}
if len(list) == 0 {
return 0, nil
}
if dm.cache == nil {
dm.cache = make(map[string]int64)
} else if id, ok := dm.cache[path]; ok {
return id, nil
}
id, err := dm.uncachedIDForPath(tx, list)
if err != nil {
return 0, err
}
dm.cache[path] = id
return id, nil
}
func isImage(path string) (bool, error) {
cmd := exec.Command("xdg-mime", "query", "filetype", path)
// XXX: Early returns may leak resources.
stdout, err := cmd.StdoutPipe()
if err != nil {
return false, err
}
if err := cmd.Start(); err != nil {
return false, err
}
out, err := io.ReadAll(stdout)
if err != nil {
return false, err
}
if err := cmd.Wait(); err != nil {
return false, err
}
return bytes.HasPrefix(out, []byte("image/")), nil
}
type importer struct {
dm directoryManager
dmMutex sync.Mutex
}
func (i *importer) Import(path string) error {
// The input may be a relative path, and we want to remember it as such,
// but symlinks for the images must be absolute.
absPath, err := filepath.Abs(path)
if err != nil {
return err
}
// Skip videos, which ImageMagick can process, but we don't want it to,
// so that they're not converted 1:1 to WebP.
pathIsImage, err := isImage(path)
if err != nil {
return err
}
if !pathIsImage {
return nil
}
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
s, err := f.Stat()
if err != nil {
return err
}
hash := sha1.New()
_, err = io.CopyBuffer(hash, f, make([]byte, 65536))
if err != nil {
return err
}
hexSHA1 := hex.EncodeToString(hash.Sum(nil))
pathImage := imagePath(hexSHA1)
imageDirname, _ := filepath.Split(pathImage)
if err := os.MkdirAll(imageDirname, 0755); err != nil {
return err
}
if err := os.Symlink(absPath, pathImage); err != nil &&
!errors.Is(err, fs.ErrExist) {
return err
}
// A concurrent transaction could be aborted, yet still result in
// creating directoryManager's cache entry, therefore this scope.
// TODO: Educate self about isolation levels and reconsider.
// Perhaps get rid of the cache.
i.dmMutex.Lock()
defer i.dmMutex.Unlock()
tx, err := db.Begin()
if err != nil {
return err
}
defer tx.Rollback()
if _, err = tx.Exec(`INSERT INTO image(sha1) VALUES (?)
ON CONFLICT(sha1) DO NOTHING`, hexSHA1); err != nil {
return err
}
dbDirname, dbBasename := filepath.Split(path)
dbParent, err := i.dm.IDForDirectoryPath(tx, dbDirname)
if err != nil {
return err
}
// FIXME: This disallows any entries directly in the root.
// TODO: Turn this into an upsert statement.
_, err = tx.Exec(`INSERT INTO entry(parent, name, mtime, sha1)
VALUES (?, ?, ?, ?)`, dbParent, dbBasename, s.ModTime().Unix(), hexSHA1)
if err != nil {
return err
}
return tx.Commit()
}
// cmdImport adds files to the "entry" table.
func cmdImport(args []string) error {
if len(args) < 1 {
return errors.New("usage: GD ROOT...")
}
if err := openDB(args[0]); err != nil {
return err
}
// Make the first step collecting all the paths,
// in order to show more useful progress information.
paths := []string{}
cb := func(path string, d fs.DirEntry, err error) error {
if err != nil || d.IsDir() {
return err
}
paths = append(paths, path)
return nil
}
for _, name := range args[1:] {
if err := filepath.WalkDir(name, cb); err != nil {
return err
}
}
pb := newProgressBar(len(paths))
defer pb.Stop()
i := importer{}
ctx, cancel := context.WithCancelCause(context.Background())
wg := sync.WaitGroup{}
for _, path := range paths {
if taskSemaphore.Acquire(ctx, 1) != nil {
break
}
wg.Add(1)
go func(path string) {
defer taskSemaphore.Release(1)
defer wg.Done()
if err := i.Import(path); err != nil {
cancel(err)
} else {
pb.Step()
}
}(path)
}
wg.Wait()
if ctx.Err() != nil {
return context.Cause(ctx)
}
return nil
}
// cmdSync is like import, but clears the "entry" table beforehands.
func cmdSync(args []string) error {
if len(args) < 1 {
return errors.New("usage: GD ROOT...")
}
if err := openDB(args[0]); err != nil {
return err
}
// TODO
return nil
}
// --- Tagging -----------------------------------------------------------------
// cmdTag mass imports tags from data passed on stdin as a TSV
// of SHA1 TAG WEIGHT entries.
func cmdTag(args []string) error {
if len(args) < 2 || len(args) > 3 {
return errors.New("usage: GD SPACE [DESCRIPTION]")
}
if err := openDB(args[0]); err != nil {
return err
}
space := args[1]
var description sql.NullString
if len(args) >= 3 {
description = sql.NullString{String: args[2], Valid: true}
}
// Note that starting as a write transaction prevents deadlocks.
// Imports are rare, and just bulk load data, so this scope is fine.
tx, err := db.Begin()
if err != nil {
return err
}
defer tx.Rollback()
if _, err := tx.Exec(`INSERT OR IGNORE INTO tag_space(name, description)
VALUES (?, ?)`, space, description); err != nil {
return err
}
var spaceID int64
if err := tx.QueryRow(`SELECT id FROM tag_space WHERE name = ?`,
space).Scan(&spaceID); err != nil {
return err
}
// TODO: Prepare statements for tag/assignment updates.
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
fields := strings.Split(scanner.Text(), "\t")
if len(fields) != 3 {
return errors.New("invalid input format")
}
sha1, tag := fields[0], fields[1]
weight, err := strconv.ParseFloat(fields[2], 64)
if err != nil {
return err
}
if _, err := tx.Exec(`INSERT OR IGNORE INTO tag(space, name)
VALUES (?, ?);`, spaceID, tag); err != nil {
return nil
}
var tagID int64
if err := tx.QueryRow(`SELECT id FROM tag WHERE space = ? AND name = ?`,
spaceID, tag).Scan(&tagID); err != nil {
return err
}
if _, err := tx.Exec(`INSERT INTO tag_assignment(sha1, tag, weight)
VALUES (?, ?, ?) ON CONFLICT DO UPDATE SET weight = ?`,
sha1, tagID, weight, weight); err != nil {
return err
}
}
if err := scanner.Err(); err != nil {
return err
}
return tx.Commit()
}
// --- Check -------------------------------------------------------------------
// cmdCheck checks if all files tracked in the DB are accessible.
func cmdCheck(args []string) error {
if len(args) != 1 {
return errors.New("usage: GD")
}
if err := openDB(args[0]); err != nil {
return err
}
// TODO: Check if all hashes of DB entries have a statable image file,
// and that all images with thumb{w,h} have a thumbnail file. Perhaps.
return nil
}
// --- Thumbnailing ------------------------------------------------------------
func makeThumbnail(pathImage, pathThumb string) (int, int, error) {
thumbDirname, _ := filepath.Split(pathThumb)
if err := os.MkdirAll(thumbDirname, 0755); err != nil {
return 0, 0, err
}
// Create a normalized thumbnail. Since we don't particularly need
// any complex processing, such as surrounding of metadata,
// simply push it through ImageMagick.
//
// - http://www.ericbrasseur.org/gamma.html
// - https://www.imagemagick.org/Usage/thumbnails/
// - https://imagemagick.org/script/command-line-options.php#layers
//
// "info:" output is written for each frame, which is why we delete
// all of them but the first one beforehands.
//
// TODO: See if we can optimize resulting WebP animations.
// (Do -layers optimize* apply to this format at all?)
cmd := exec.Command("convert", "-limit", "thread", "1", pathImage,
"-coalesce", "-colorspace", "RGB", "-auto-orient", "-strip",
"-resize", "256x128>", "-colorspace", "sRGB",
"-format", "%w %h", "+write", pathThumb, "-delete", "1--1", "info:")
// XXX: Early returns may leak resources.
stdout, err := cmd.StdoutPipe()
if err != nil {
return 0, 0, err
}
if err := cmd.Start(); err != nil {
return 0, 0, err
}
out, err := io.ReadAll(stdout)
if err != nil {
return 0, 0, err
}
if err := cmd.Wait(); err != nil {
return 0, 0, err
}
var w, h int
_, err = fmt.Fscanf(bytes.NewReader(out), "%d %d", &w, &h)
return w, h, err
}
func makeThumbnailFor(sha1 string) error {
pathImage := imagePath(sha1)
pathThumb := thumbPath(sha1)
w, h, err := makeThumbnail(pathImage, pathThumb)
if err != nil {
return err
}
_, err = db.Exec(`UPDATE image SET thumbw = ?, thumbh = ?
WHERE sha1 = ?`, w, h, sha1)
return err
}
// cmdThumbnail generates missing thumbnails, in parallel.
func cmdThumbnail(args []string) error {
if len(args) < 1 {
return errors.New("usage: GD [SHA1...]")
}
if err := openDB(args[0]); err != nil {
return err
}
hexSHA1 := args[1:]
if len(hexSHA1) == 0 {
// Get all unique images in the database with no thumbnail.
var err error
hexSHA1, err = dbCollectStrings(`SELECT sha1 FROM image
WHERE thumbw IS NULL OR thumbh IS NULL`)
if err != nil {
return err
}
}
pb := newProgressBar(len(hexSHA1))
defer pb.Stop()
ctx, cancel := context.WithCancelCause(context.Background())
wg := sync.WaitGroup{}
for _, sha1 := range hexSHA1 {
if taskSemaphore.Acquire(ctx, 1) != nil {
break
}
wg.Add(1)
go func(sha1 string) {
defer taskSemaphore.Release(1)
defer wg.Done()
if err := makeThumbnailFor(sha1); err != nil {
cancel(err)
} else {
pb.Step()
}
}(sha1)
}
wg.Wait()
if ctx.Err() != nil {
return context.Cause(ctx)
}
return nil
}
// --- Perceptual hash ---------------------------------------------------------
func makeDhash(hasher, pathThumb string) (uint64, error) {
cmd := exec.Command(hasher, pathThumb)
// XXX: Early returns may leak resources.
stdout, err := cmd.StdoutPipe()
if err != nil {
return 0, err
}
if err := cmd.Start(); err != nil {
return 0, err
}
out, err := io.ReadAll(stdout)
if err != nil {
return 0, err
}
if err := cmd.Wait(); err != nil {
return 0, err
}
var hash uint64
_, err = fmt.Fscanf(bytes.NewReader(out), "%x", &hash)
return hash, err
}
// cmdDhash generates perceptual hash from thumbnails.
func cmdDhash(args []string) error {
if len(args) < 1 {
return errors.New("usage: GD HASHER [SHA1...]")
}
if err := openDB(args[0]); err != nil {
return err
}
hasher, hexSHA1 := args[1], args[2:]
if len(hexSHA1) == 0 {
var err error
hexSHA1, err = dbCollectStrings(`
SELECT sha1 FROM image WHERE dhash IS NULL`)
if err != nil {
return err
}
}
pb := newProgressBar(len(hexSHA1))
defer pb.Stop()
// TODO: Also run the hasher in parallel, once it becomes a problem.
// And/or run it in batches, since start-up time of the hasher
// poses considerable overhead with large amounts of images.
for _, sha1 := range hexSHA1 {
pathThumb := thumbPath(sha1)
hash, err := makeDhash(hasher, pathThumb)
if err != nil {
return err
}
_, err = db.Exec(`UPDATE image SET dhash = ? WHERE sha1 = ?`,
int64(hash), sha1)
if err != nil {
return err
}
pb.Step()
}
return nil
}
// --- Main --------------------------------------------------------------------
var commands = map[string]struct {
handler func(args []string) error
}{
"init": {cmdInit},
"run": {cmdRun},
"import": {cmdImport},
"tag": {cmdTag},
"sync": {cmdSync},
"check": {cmdCheck},
"thumbnail": {cmdThumbnail},
"dhash": {cmdDhash},
}
func main() {
if len(os.Args) <= 2 {
log.Fatalln("Missing arguments")
}
cmd, ok := commands[os.Args[1]]
if !ok {
log.Fatalln("Unknown command: " + os.Args[1])
}
taskSemaphore = semaphore.NewWeighted(int64(runtime.NumCPU()))
err := cmd.handler(os.Args[2:])
// Note that the database object has a closing finalizer,
// we just additionally print any errors coming from there.
if db != nil {
if err := db.Close(); err != nil {
log.Println(err)
}
}
if err != nil {
log.Fatalln(err)
}
}
|
