forked from ipfs/kubo
-
Notifications
You must be signed in to change notification settings - Fork 0
/
daemon.go
661 lines (561 loc) · 20.3 KB
/
daemon.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
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
package main
import (
"errors"
_ "expvar"
"fmt"
"net"
"net/http"
_ "net/http/pprof"
"os"
"sort"
"sync"
utilmain "github.com/ipfs/go-ipfs/cmd/ipfs/util"
oldcmds "github.com/ipfs/go-ipfs/commands"
"github.com/ipfs/go-ipfs/core"
commands "github.com/ipfs/go-ipfs/core/commands"
corehttp "github.com/ipfs/go-ipfs/core/corehttp"
corerepo "github.com/ipfs/go-ipfs/core/corerepo"
nodeMount "github.com/ipfs/go-ipfs/fuse/node"
fsrepo "github.com/ipfs/go-ipfs/repo/fsrepo"
migrate "github.com/ipfs/go-ipfs/repo/fsrepo/migrations"
cmds "gx/ipfs/QmNueRyPRQiV7PUEpnP4GgGLuK1rKQLaRW7sfPvUetYig1/go-ipfs-cmds"
mprome "gx/ipfs/QmUGLYA38oUQstGTYfG3ECcu4G9QT8aHfy72bjHLyx7zzh/go-metrics-prometheus"
"gx/ipfs/QmV6FjemM1K8oXjrvuq3wuVWWoU2TLDPmNnKrxHzY3v6Ai/go-multiaddr-net"
"gx/ipfs/QmX3QZ5jHEPidwUrymXV1iSCSUhdGxj15sm2gP4jKMef7B/client_golang/prometheus"
ma "gx/ipfs/QmYmsdtJ3HsodkePE3eU3TsCaP2YvPZJ4LoXnNkDE5Tpt7/go-multiaddr"
"gx/ipfs/QmdE4gMduCKCGAcczM2F5ioYDfdeKuPix138wrES1YSr7f/go-ipfs-cmdkit"
)
const (
adjustFDLimitKwd = "manage-fdlimit"
enableGCKwd = "enable-gc"
initOptionKwd = "init"
initProfileOptionKwd = "init-profile"
ipfsMountKwd = "mount-ipfs"
ipnsMountKwd = "mount-ipns"
migrateKwd = "migrate"
mountKwd = "mount"
offlineKwd = "offline"
routingOptionKwd = "routing"
routingOptionSupernodeKwd = "supernode"
routingOptionDHTClientKwd = "dhtclient"
routingOptionDHTKwd = "dht"
routingOptionNoneKwd = "none"
routingOptionDefaultKwd = "default"
unencryptTransportKwd = "disable-transport-encryption"
unrestrictedApiAccessKwd = "unrestricted-api"
writableKwd = "writable"
enableFloodSubKwd = "enable-pubsub-experiment"
enableIPNSPubSubKwd = "enable-namesys-pubsub"
enableMultiplexKwd = "enable-mplex-experiment"
// apiAddrKwd = "address-api"
// swarmAddrKwd = "address-swarm"
)
var daemonCmd = &cmds.Command{
Helptext: cmdkit.HelpText{
Tagline: "Run a network-connected IPFS node.",
ShortDescription: `
'ipfs daemon' runs a persistent ipfs daemon that can serve commands
over the network. Most applications that use IPFS will do so by
communicating with a daemon over the HTTP API. While the daemon is
running, calls to 'ipfs' commands will be sent over the network to
the daemon.
`,
LongDescription: `
The daemon will start listening on ports on the network, which are
documented in (and can be modified through) 'ipfs config Addresses'.
For example, to change the 'Gateway' port:
ipfs config Addresses.Gateway /ip4/127.0.0.1/tcp/8082
The API address can be changed the same way:
ipfs config Addresses.API /ip4/127.0.0.1/tcp/5002
Make sure to restart the daemon after changing addresses.
By default, the gateway is only accessible locally. To expose it to
other computers in the network, use 0.0.0.0 as the ip address:
ipfs config Addresses.Gateway /ip4/0.0.0.0/tcp/8080
Be careful if you expose the API. It is a security risk, as anyone could
control your node remotely. If you need to control the node remotely,
make sure to protect the port as you would other services or database
(firewall, authenticated proxy, etc).
HTTP Headers
ipfs supports passing arbitrary headers to the API and Gateway. You can
do this by setting headers on the API.HTTPHeaders and Gateway.HTTPHeaders
keys:
ipfs config --json API.HTTPHeaders.X-Special-Header '["so special :)"]'
ipfs config --json Gateway.HTTPHeaders.X-Special-Header '["so special :)"]'
Note that the value of the keys is an _array_ of strings. This is because
headers can have more than one value, and it is convenient to pass through
to other libraries.
CORS Headers (for API)
You can setup CORS headers the same way:
ipfs config --json API.HTTPHeaders.Access-Control-Allow-Origin '["example.com"]'
ipfs config --json API.HTTPHeaders.Access-Control-Allow-Methods '["PUT", "GET", "POST"]'
ipfs config --json API.HTTPHeaders.Access-Control-Allow-Credentials '["true"]'
Shutdown
To shutdown the daemon, send a SIGINT signal to it (e.g. by pressing 'Ctrl-C')
or send a SIGTERM signal to it (e.g. with 'kill'). It may take a while for the
daemon to shutdown gracefully, but it can be killed forcibly by sending a
second signal.
IPFS_PATH environment variable
ipfs uses a repository in the local file system. By default, the repo is
located at ~/.ipfs. To change the repo location, set the $IPFS_PATH
environment variable:
export IPFS_PATH=/path/to/ipfsrepo
Routing
IPFS by default will use a DHT for content routing. There is a highly
experimental alternative that operates the DHT in a 'client only' mode that
can be enabled by running the daemon as:
ipfs daemon --routing=dhtclient
This will later be transitioned into a config option once it gets out of the
'experimental' stage.
DEPRECATION NOTICE
Previously, ipfs used an environment variable as seen below:
export API_ORIGIN="http://localhost:8888/"
This is deprecated. It is still honored in this version, but will be removed
in a future version, along with this notice. Please move to setting the HTTP
Headers.
`,
},
Options: []cmdkit.Option{
cmdkit.BoolOption(initOptionKwd, "Initialize ipfs with default settings if not already initialized"),
cmdkit.StringOption(initProfileOptionKwd, "Configuration profiles to apply for --init. See ipfs init --help for more"),
cmdkit.StringOption(routingOptionKwd, "Overrides the routing option").WithDefault(routingOptionDefaultKwd),
cmdkit.BoolOption(mountKwd, "Mounts IPFS to the filesystem"),
cmdkit.BoolOption(writableKwd, "Enable writing objects (with POST, PUT and DELETE)"),
cmdkit.StringOption(ipfsMountKwd, "Path to the mountpoint for IPFS (if using --mount). Defaults to config setting."),
cmdkit.StringOption(ipnsMountKwd, "Path to the mountpoint for IPNS (if using --mount). Defaults to config setting."),
cmdkit.BoolOption(unrestrictedApiAccessKwd, "Allow API access to unlisted hashes"),
cmdkit.BoolOption(unencryptTransportKwd, "Disable transport encryption (for debugging protocols)"),
cmdkit.BoolOption(enableGCKwd, "Enable automatic periodic repo garbage collection"),
cmdkit.BoolOption(adjustFDLimitKwd, "Check and raise file descriptor limits if needed").WithDefault(true),
cmdkit.BoolOption(offlineKwd, "Run offline. Do not connect to the rest of the network but provide local API."),
cmdkit.BoolOption(migrateKwd, "If true, assume yes at the migrate prompt. If false, assume no."),
cmdkit.BoolOption(enableFloodSubKwd, "Instantiate the ipfs daemon with the experimental pubsub feature enabled."),
cmdkit.BoolOption(enableIPNSPubSubKwd, "Enable IPNS record distribution through pubsub; enables pubsub."),
cmdkit.BoolOption(enableMultiplexKwd, "Add the experimental 'go-multiplex' stream muxer to libp2p on construction.").WithDefault(true),
// TODO: add way to override addresses. tricky part: updating the config if also --init.
// cmdkit.StringOption(apiAddrKwd, "Address for the daemon rpc API (overrides config)"),
// cmdkit.StringOption(swarmAddrKwd, "Address for the swarm socket (overrides config)"),
},
Subcommands: map[string]*cmds.Command{},
Run: daemonFunc,
}
// defaultMux tells mux to serve path using the default muxer. This is
// mostly useful to hook up things that register in the default muxer,
// and don't provide a convenient http.Handler entry point, such as
// expvar and http/pprof.
func defaultMux(path string) corehttp.ServeOption {
return func(node *core.IpfsNode, _ net.Listener, mux *http.ServeMux) (*http.ServeMux, error) {
mux.Handle(path, http.DefaultServeMux)
return mux, nil
}
}
func daemonFunc(req *cmds.Request, re cmds.ResponseEmitter, env cmds.Environment) {
// Inject metrics before we do anything
err := mprome.Inject()
if err != nil {
log.Errorf("Injecting prometheus handler for metrics failed with message: %s\n", err.Error())
}
// let the user know we're going.
fmt.Printf("Initializing daemon...\n")
managefd, _ := req.Options[adjustFDLimitKwd].(bool)
if managefd {
if err := utilmain.ManageFdLimit(); err != nil {
log.Errorf("setting file descriptor limit: %s", err)
}
}
cctx := env.(*oldcmds.Context)
go func() {
<-req.Context.Done()
fmt.Println("Received interrupt signal, shutting down...")
fmt.Println("(Hit ctrl-c again to force-shutdown the daemon.)")
}()
// check transport encryption flag.
unencrypted, _ := req.Options[unencryptTransportKwd].(bool)
if unencrypted {
log.Warningf(`Running with --%s: All connections are UNENCRYPTED.
You will not be able to connect to regular encrypted networks.`, unencryptTransportKwd)
}
// first, whether user has provided the initialization flag. we may be
// running in an uninitialized state.
initialize, _ := req.Options[initOptionKwd].(bool)
if initialize {
cfg := cctx.ConfigRoot
if !fsrepo.IsInitialized(cfg) {
profiles, _ := req.Options[initProfileOptionKwd].(string)
err := initWithDefaults(os.Stdout, cfg, profiles)
if err != nil {
re.SetError(err, cmdkit.ErrNormal)
return
}
}
}
// acquire the repo lock _before_ constructing a node. we need to make
// sure we are permitted to access the resources (datastore, etc.)
repo, err := fsrepo.Open(cctx.ConfigRoot)
switch err {
default:
re.SetError(err, cmdkit.ErrNormal)
return
case fsrepo.ErrNeedMigration:
domigrate, found := req.Options[migrateKwd].(bool)
fmt.Println("Found outdated fs-repo, migrations need to be run.")
if !found {
domigrate = YesNoPrompt("Run migrations now? [y/N]")
}
if !domigrate {
fmt.Println("Not running migrations of fs-repo now.")
fmt.Println("Please get fs-repo-migrations from https://dist.ipfs.io")
re.SetError(fmt.Errorf("fs-repo requires migration"), cmdkit.ErrNormal)
return
}
err = migrate.RunMigration(fsrepo.RepoVersion)
if err != nil {
fmt.Println("The migrations of fs-repo failed:")
fmt.Printf(" %s\n", err)
fmt.Println("If you think this is a bug, please file an issue and include this whole log output.")
fmt.Println(" https://github.com/ipfs/fs-repo-migrations")
re.SetError(err, cmdkit.ErrNormal)
return
}
repo, err = fsrepo.Open(cctx.ConfigRoot)
if err != nil {
re.SetError(err, cmdkit.ErrNormal)
return
}
case nil:
break
}
cfg, err := cctx.GetConfig()
if err != nil {
re.SetError(err, cmdkit.ErrNormal)
return
}
offline, _ := req.Options[offlineKwd].(bool)
ipnsps, _ := req.Options[enableIPNSPubSubKwd].(bool)
pubsub, _ := req.Options[enableFloodSubKwd].(bool)
mplex, _ := req.Options[enableMultiplexKwd].(bool)
// Start assembling node config
ncfg := &core.BuildCfg{
Repo: repo,
Permanent: true, // It is temporary way to signify that node is permanent
Online: !offline,
DisableEncryptedConnections: unencrypted,
ExtraOpts: map[string]bool{
"pubsub": pubsub,
"ipnsps": ipnsps,
"mplex": mplex,
},
//TODO(Kubuxu): refactor Online vs Offline by adding Permanent vs Ephemeral
}
routingOption, _ := req.Options[routingOptionKwd].(string)
if routingOption == routingOptionDefaultKwd {
cfg, err := repo.Config()
if err != nil {
re.SetError(err, cmdkit.ErrNormal)
return
}
routingOption = cfg.Routing.Type
if routingOption == "" {
routingOption = routingOptionDHTKwd
}
}
switch routingOption {
case routingOptionSupernodeKwd:
re.SetError(errors.New("supernode routing was never fully implemented and has been removed"), cmdkit.ErrNormal)
return
case routingOptionDHTClientKwd:
ncfg.Routing = core.DHTClientOption
case routingOptionDHTKwd:
ncfg.Routing = core.DHTOption
case routingOptionNoneKwd:
ncfg.Routing = core.NilRouterOption
default:
re.SetError(fmt.Errorf("unrecognized routing option: %s", routingOption), cmdkit.ErrNormal)
return
}
node, err := core.NewNode(req.Context, ncfg)
if err != nil {
log.Error("error from node construction: ", err)
re.SetError(err, cmdkit.ErrNormal)
return
}
node.SetLocal(false)
if node.PNetFingerprint != nil {
fmt.Println("Swarm is limited to private network of peers with the swarm key")
fmt.Printf("Swarm key fingerprint: %x\n", node.PNetFingerprint)
}
printSwarmAddrs(node)
defer func() {
// We wait for the node to close first, as the node has children
// that it will wait for before closing, such as the API server.
node.Close()
select {
case <-req.Context.Done():
log.Info("Gracefully shut down daemon")
default:
}
}()
cctx.ConstructNode = func() (*core.IpfsNode, error) {
return node, nil
}
// construct api endpoint - every time
apiErrc, err := serveHTTPApi(req, cctx)
if err != nil {
re.SetError(err, cmdkit.ErrNormal)
return
}
// construct fuse mountpoints - if the user provided the --mount flag
mount, _ := req.Options[mountKwd].(bool)
if mount && offline {
re.SetError(errors.New("mount is not currently supported in offline mode"),
cmdkit.ErrClient)
return
}
if mount {
if err := mountFuse(req, cctx); err != nil {
re.SetError(err, cmdkit.ErrNormal)
return
}
}
// repo blockstore GC - if --enable-gc flag is present
gcErrc, err := maybeRunGC(req, node)
if err != nil {
re.SetError(err, cmdkit.ErrNormal)
return
}
// construct http gateway - if it is set in the config
var gwErrc <-chan error
if len(cfg.Addresses.Gateway) > 0 {
var err error
gwErrc, err = serveHTTPGateway(req, cctx)
if err != nil {
re.SetError(err, cmdkit.ErrNormal)
return
}
}
// initialize metrics collector
prometheus.MustRegister(&corehttp.IpfsNodeCollector{Node: node})
fmt.Printf("Daemon is ready\n")
// collect long-running errors and block for shutdown
// TODO(cryptix): our fuse currently doesnt follow this pattern for graceful shutdown
for err := range merge(apiErrc, gwErrc, gcErrc) {
if err != nil {
log.Error(err)
re.SetError(err, cmdkit.ErrNormal)
}
}
}
// serveHTTPApi collects options, creates listener, prints status message and starts serving requests
func serveHTTPApi(req *cmds.Request, cctx *oldcmds.Context) (<-chan error, error) {
cfg, err := cctx.GetConfig()
if err != nil {
return nil, fmt.Errorf("serveHTTPApi: GetConfig() failed: %s", err)
}
apiAddr, _ := req.Options[commands.ApiOption].(string)
if apiAddr == "" {
apiAddr = cfg.Addresses.API
}
apiMaddr, err := ma.NewMultiaddr(apiAddr)
if err != nil {
return nil, fmt.Errorf("serveHTTPApi: invalid API address: %q (err: %s)", apiAddr, err)
}
apiLis, err := manet.Listen(apiMaddr)
if err != nil {
return nil, fmt.Errorf("serveHTTPApi: manet.Listen(%s) failed: %s", apiMaddr, err)
}
// we might have listened to /tcp/0 - lets see what we are listing on
apiMaddr = apiLis.Multiaddr()
fmt.Printf("API server listening on %s\n", apiMaddr)
// by default, we don't let you load arbitrary ipfs objects through the api,
// because this would open up the api to scripting vulnerabilities.
// only the webui objects are allowed.
// if you know what you're doing, go ahead and pass --unrestricted-api.
unrestricted, _ := req.Options[unrestrictedApiAccessKwd].(bool)
gatewayOpt := corehttp.GatewayOption(false, corehttp.WebUIPaths...)
if unrestricted {
gatewayOpt = corehttp.GatewayOption(true, "/ipfs", "/ipns")
}
var opts = []corehttp.ServeOption{
corehttp.MetricsCollectionOption("api"),
corehttp.CheckVersionOption(),
corehttp.CommandsOption(*cctx),
corehttp.WebUIOption,
gatewayOpt,
corehttp.VersionOption(),
defaultMux("/debug/vars"),
defaultMux("/debug/pprof/"),
corehttp.MetricsScrapingOption("/debug/metrics/prometheus"),
corehttp.LogOption(),
}
if len(cfg.Gateway.RootRedirect) > 0 {
opts = append(opts, corehttp.RedirectOption("", cfg.Gateway.RootRedirect))
}
node, err := cctx.ConstructNode()
if err != nil {
return nil, fmt.Errorf("serveHTTPApi: ConstructNode() failed: %s", err)
}
if err := node.Repo.SetAPIAddr(apiMaddr); err != nil {
return nil, fmt.Errorf("serveHTTPApi: SetAPIAddr() failed: %s", err)
}
errc := make(chan error)
go func() {
errc <- corehttp.Serve(node, manet.NetListener(apiLis), opts...)
close(errc)
}()
return errc, nil
}
// printSwarmAddrs prints the addresses of the host
func printSwarmAddrs(node *core.IpfsNode) {
if !node.OnlineMode() {
fmt.Println("Swarm not listening, running in offline mode.")
return
}
var lisAddrs []string
ifaceAddrs, err := node.PeerHost.Network().InterfaceListenAddresses()
if err != nil {
log.Errorf("failed to read listening addresses: %s", err)
}
for _, addr := range ifaceAddrs {
lisAddrs = append(lisAddrs, addr.String())
}
sort.Sort(sort.StringSlice(lisAddrs))
for _, addr := range lisAddrs {
fmt.Printf("Swarm listening on %s\n", addr)
}
var addrs []string
for _, addr := range node.PeerHost.Addrs() {
addrs = append(addrs, addr.String())
}
sort.Sort(sort.StringSlice(addrs))
for _, addr := range addrs {
fmt.Printf("Swarm announcing %s\n", addr)
}
}
// serveHTTPGateway collects options, creates listener, prints status message and starts serving requests
func serveHTTPGateway(req *cmds.Request, cctx *oldcmds.Context) (<-chan error, error) {
cfg, err := cctx.GetConfig()
if err != nil {
return nil, fmt.Errorf("serveHTTPGateway: GetConfig() failed: %s", err)
}
gatewayMaddr, err := ma.NewMultiaddr(cfg.Addresses.Gateway)
if err != nil {
return nil, fmt.Errorf("serveHTTPGateway: invalid gateway address: %q (err: %s)", cfg.Addresses.Gateway, err)
}
writable, writableOptionFound := req.Options[writableKwd].(bool)
if !writableOptionFound {
writable = cfg.Gateway.Writable
}
gwLis, err := manet.Listen(gatewayMaddr)
if err != nil {
return nil, fmt.Errorf("serveHTTPGateway: manet.Listen(%s) failed: %s", gatewayMaddr, err)
}
// we might have listened to /tcp/0 - lets see what we are listing on
gatewayMaddr = gwLis.Multiaddr()
if writable {
fmt.Printf("Gateway (writable) server listening on %s\n", gatewayMaddr)
} else {
fmt.Printf("Gateway (readonly) server listening on %s\n", gatewayMaddr)
}
var opts = []corehttp.ServeOption{
corehttp.MetricsCollectionOption("gateway"),
corehttp.CheckVersionOption(),
corehttp.CommandsROOption(*cctx),
corehttp.VersionOption(),
corehttp.IPNSHostnameOption(),
corehttp.GatewayOption(writable, "/ipfs", "/ipns"),
}
if len(cfg.Gateway.RootRedirect) > 0 {
opts = append(opts, corehttp.RedirectOption("", cfg.Gateway.RootRedirect))
}
node, err := cctx.ConstructNode()
if err != nil {
return nil, fmt.Errorf("serveHTTPGateway: ConstructNode() failed: %s", err)
}
errc := make(chan error)
go func() {
errc <- corehttp.Serve(node, manet.NetListener(gwLis), opts...)
close(errc)
}()
return errc, nil
}
//collects options and opens the fuse mountpoint
func mountFuse(req *cmds.Request, cctx *oldcmds.Context) error {
cfg, err := cctx.GetConfig()
if err != nil {
return fmt.Errorf("mountFuse: GetConfig() failed: %s", err)
}
fsdir, found := req.Options[ipfsMountKwd].(string)
if !found {
fsdir = cfg.Mounts.IPFS
}
nsdir, found := req.Options[ipnsMountKwd].(string)
if !found {
nsdir = cfg.Mounts.IPNS
}
node, err := cctx.ConstructNode()
if err != nil {
return fmt.Errorf("mountFuse: ConstructNode() failed: %s", err)
}
err = nodeMount.Mount(node, fsdir, nsdir)
if err != nil {
return err
}
fmt.Printf("IPFS mounted at: %s\n", fsdir)
fmt.Printf("IPNS mounted at: %s\n", nsdir)
return nil
}
func maybeRunGC(req *cmds.Request, node *core.IpfsNode) (<-chan error, error) {
enableGC, _ := req.Options[enableGCKwd].(bool)
if !enableGC {
return nil, nil
}
errc := make(chan error)
go func() {
errc <- corerepo.PeriodicGC(req.Context, node)
close(errc)
}()
return errc, nil
}
// merge does fan-in of multiple read-only error channels
// taken from http://blog.golang.org/pipelines
func merge(cs ...<-chan error) <-chan error {
var wg sync.WaitGroup
out := make(chan error)
// Start an output goroutine for each input channel in cs. output
// copies values from c to out until c is closed, then calls wg.Done.
output := func(c <-chan error) {
for n := range c {
out <- n
}
wg.Done()
}
for _, c := range cs {
if c != nil {
wg.Add(1)
go output(c)
}
}
// Start a goroutine to close out once all the output goroutines are
// done. This must start after the wg.Add call.
go func() {
wg.Wait()
close(out)
}()
return out
}
func YesNoPrompt(prompt string) bool {
var s string
for i := 0; i < 3; i++ {
fmt.Printf("%s ", prompt)
fmt.Scanf("%s", &s)
switch s {
case "y", "Y":
return true
case "n", "N":
return false
case "":
return false
}
fmt.Println("Please press either 'y' or 'n'")
}
return false
}