aboutsummaryrefslogtreecommitdiffstats
path: root/lib/agent/xdsserver.go
blob: 3ec612380585fcf019cc609d4bf132f4a3242fb4 (plain)
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
/*
 * Copyright (C) 2017 "IoT.bzh"
 * Author Sebastien Douheret <sebastien@iot.bzh>
 *
 * 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package agent

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"
	"sync"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/iotbzh/xds-agent/lib/xaapiv1"
	"github.com/iotbzh/xds-agent/lib/xdsconfig"
	common "github.com/iotbzh/xds-common/golib"
	"github.com/iotbzh/xds-server/lib/xsapiv1"
	uuid "github.com/satori/go.uuid"
	sio_client "github.com/sebd71/go-socket.io-client"
)

// XdsServer .
type XdsServer struct {
	*Context
	ID           string
	BaseURL      string
	APIURL       string
	PartialURL   string
	ConnRetry    int
	Connected    bool
	Disabled     bool
	ServerConfig *xsapiv1.APIConfig

	// Events management
	CBOnError      func(error)
	CBOnDisconnect func(error)
	sockEvents     map[string][]*caller
	sockEventsLock *sync.Mutex

	// Private fields
	client    *common.HTTPClient
	ioSock    *sio_client.Client
	logOut    io.Writer
	apiRouter *gin.RouterGroup
	cmdList   map[string]interface{}
}

// EventCB Event emitter callback
type EventCB func(privData interface{}, evtData interface{}) error

// caller Used to chain event listeners
type caller struct {
	id          uuid.UUID
	EventName   string
	Func        EventCB
	PrivateData interface{}
}

const _IDTempoPrefix = "tempo-"

// NewXdsServer creates an instance of XdsServer
func NewXdsServer(ctx *Context, conf xdsconfig.XDSServerConf) *XdsServer {
	return &XdsServer{
		Context:    ctx,
		ID:         _IDTempoPrefix + uuid.NewV1().String(),
		BaseURL:    conf.URL,
		APIURL:     conf.APIBaseURL + conf.APIPartialURL,
		PartialURL: conf.APIPartialURL,
		ConnRetry:  conf.ConnRetry,
		Connected:  false,
		Disabled:   false,

		sockEvents:     make(map[string][]*caller),
		sockEventsLock: &sync.Mutex{},
		logOut:         ctx.Log.Out,
		cmdList:        make(map[string]interface{}),
	}
}

// Close Free and close XDS Server connection
func (xs *XdsServer) Close() error {
	err := xs._Disconnected()
	xs.Disabled = true
	return err
}

// Connect Establish HTTP connection with XDS Server
func (xs *XdsServer) Connect() error {
	var err error
	var retry int

	xs.Disabled = false
	xs.Connected = false

	err = nil
	for retry = xs.ConnRetry; retry > 0; retry-- {
		if err = xs._CreateConnectHTTP(); err == nil {
			break
		}
		if retry == xs.ConnRetry {
			// Notify only on the first conn error
			// doing that avoid 2 notifs (conn false; conn true) on startup
			xs._NotifyState()
		}
		xs.Log.Infof("Establishing connection to XDS Server (retry %d/%d)", retry, xs.ConnRetry)
		time.Sleep(time.Second)
	}
	if retry == 0 {
		// FIXME: re-use _Reconnect to wait longer in background
		return fmt.Errorf("Connection to XDS Server failure")
	}
	if err != nil {
		return err
	}

	// Check HTTP connection and establish WS connection
	err = xs._Connect(false)

	return err
}

// IsTempoID returns true when server as a temporary id
func (xs *XdsServer) IsTempoID() bool {
	return strings.HasPrefix(xs.ID, _IDTempoPrefix)
}

// SetLoggerOutput Set logger ou
func (xs *XdsServer) SetLoggerOutput(out io.Writer) {
	xs.logOut = out
}

// SendCommand Send a command to XDS Server
func (xs *XdsServer) SendCommand(cmd string, body []byte, res interface{}) error {
	url := cmd
	if !strings.HasPrefix("/", cmd) {
		url = "/" + cmd
	}
	return xs.client.Post(url, string(body), res)
}

// GetVersion Send Get request to retrieve XDS Server version
func (xs *XdsServer) GetVersion(res interface{}) error {
	return xs.client.Get("/version", &res)
}

// GetFolders Send GET request to get current folder configuration
func (xs *XdsServer) GetFolders(folders *[]xsapiv1.FolderConfig) error {
	return xs.client.Get("/folders", folders)
}

// FolderAdd Send POST request to add a folder
func (xs *XdsServer) FolderAdd(fld *xsapiv1.FolderConfig, res interface{}) error {
	err := xs.client.Post("/folders", fld, res)
	if err != nil {
		return fmt.Errorf("FolderAdd error: %s", err.Error())
	}
	return err
}

// FolderDelete Send DELETE request to delete a folder
func (xs *XdsServer) FolderDelete(id string) error {
	return xs.client.HTTPDelete("/folders/" + id)
}

// FolderSync Send POST request to force synchronization of a folder
func (xs *XdsServer) FolderSync(id string) error {
	return xs.client.HTTPPost("/folders/sync/"+id, "")
}

// FolderUpdate Send PUT request to update a folder
func (xs *XdsServer) FolderUpdate(fld *xsapiv1.FolderConfig, resFld *xsapiv1.FolderConfig) error {
	return xs.client.Put("/folders/"+fld.ID, fld, resFld)
}

// CommandExec Send POST request to execute a command
func (xs *XdsServer) CommandExec(args *xsapiv1.ExecArgs, res *xsapiv1.ExecResult) error {
	return xs.client.Post("/exec", args, res)
}

// CommandSignal Send POST request to send a signal to a command
func (xs *XdsServer) CommandSignal(args *xsapiv1.ExecSignalArgs, res *xsapiv1.ExecSigResult) error {
	return xs.client.Post("/signal", args, res)
}

// SetAPIRouterGroup .
func (xs *XdsServer) SetAPIRouterGroup(r *gin.RouterGroup) {
	xs.apiRouter = r
}

// PassthroughGet Used to declare a route that sends directly a GET request to XDS Server
func (xs *XdsServer) PassthroughGet(url string) {
	if xs.apiRouter == nil {
		xs.Log.Errorf("apiRouter not set !")
		return
	}

	xs.apiRouter.GET(url, func(c *gin.Context) {
		var data interface{}
		// Take care of param (eg. id in /projects/:id)
		nURL := url
		if strings.Contains(url, ":") {
			nURL = strings.TrimPrefix(c.Request.URL.Path, xs.APIURL)
		}
		// Send Get request
		if err := xs.client.Get(nURL, &data); err != nil {
			if strings.Contains(err.Error(), "connection refused") {
				xs._Disconnected()
			}
			common.APIError(c, err.Error())
			return
		}

		c.JSON(http.StatusOK, data)
	})
}

// PassthroughPost Used to declare a route that sends directly a POST request to XDS Server
func (xs *XdsServer) PassthroughPost(url string) {
	if xs.apiRouter == nil {
		xs.Log.Errorf("apiRouter not set !")
		return
	}

	xs.apiRouter.POST(url, func(c *gin.Context) {
		var err error
		var data interface{}

		// Get raw body
		body, err := c.GetRawData()
		if err != nil {
			common.APIError(c, err.Error())
			return
		}

		// Take care of param (eg. id in /projects/:id)
		nURL := url
		if strings.Contains(url, ":") {
			nURL = strings.TrimPrefix(c.Request.URL.Path, xs.APIURL)
		}

		// Send Post request
		response, err := xs.client.HTTPPostWithRes(nURL, string(body))
		if err != nil {
			goto httpError
		}
		if response.StatusCode != 200 {
			err = fmt.Errorf(response.Status)
			return
		}
		err = json.Unmarshal(xs.client.ResponseToBArray(response), &data)
		if err != nil {
			goto httpError
		}

		c.JSON(http.StatusOK, data)
		return

		/* Handle error case */
	httpError:
		if strings.Contains(err.Error(), "connection refused") {
			xs._Disconnected()
		}
		common.APIError(c, err.Error())
	})
}

// PassthroughDelete Used to declare a route that sends directly a Delete request to XDS Server
func (xs *XdsServer) PassthroughDelete(url string) {
	if xs.apiRouter == nil {
		xs.Log.Errorf("apiRouter not set !")
		return
	}

	xs.apiRouter.DELETE(url, func(c *gin.Context) {
		var err error
		var data interface{}

		// Take care of param (eg. id in /projects/:id)
		nURL := url
		if strings.Contains(url, ":") {
			nURL = strings.TrimPrefix(c.Request.URL.Path, xs.APIURL)
		}

		// Send Post request
		response, err := xs.client.HTTPDeleteWithRes(nURL)
		if err != nil {
			goto httpError
		}
		if response.StatusCode != 200 {
			err = fmt.Errorf(response.Status)
			return
		}
		err = json.Unmarshal(xs.client.ResponseToBArray(response), &data)
		if err != nil {
			goto httpError
		}

		c.JSON(http.StatusOK, data)
		return

		/* Handle error case */
	httpError:
		if strings.Contains(err.Error(), "connection refused") {
			xs._Disconnected()
		}
		common.APIError(c, err.Error())
	})
}

// EventRegister Post a request to register to an XdsServer event
func (xs *XdsServer) EventRegister(evName string, filter string) error {
	return xs.client.Post("/events/register",
		xsapiv1.EventRegisterArgs{
			Name:   evName,
			Filter: filter,
		},
		nil)
}

// EventEmit Emit a event to XDS Server through WS
func (xs *XdsServer) EventEmit(message string, args ...interface{}) error {
	if xs.ioSock == nil {
		return fmt.Errorf("Io.Socket not initialized")
	}

	return xs.ioSock.Emit(message, args...)
}

// EventOn Register a callback on events reception
func (xs *XdsServer) EventOn(evName string, privData interface{}, f EventCB) (uuid.UUID, error) {
	if xs.ioSock == nil {
		return uuid.Nil, fmt.Errorf("Io.Socket not initialized")
	}

	xs.sockEventsLock.Lock()
	defer xs.sockEventsLock.Unlock()

	if _, exist := xs.sockEvents[evName]; !exist {
		// Register listener only the first time
		evn := evName

		err := xs.ioSock.On(evn, func(data interface{}) error {
			xs.sockEventsLock.Lock()
			sEvts := make([]*caller, len(xs.sockEvents[evn]))
			copy(sEvts, xs.sockEvents[evn])
			xs.sockEventsLock.Unlock()
			for _, c := range sEvts {
				c.Func(c.PrivateData, data)
			}
			return nil
		})
		if err != nil {
			return uuid.Nil, err
		}
	}

	c := &caller{
		id:          uuid.NewV1(),
		EventName:   evName,
		Func:        f,
		PrivateData: privData,
	}

	xs.sockEvents[evName] = append(xs.sockEvents[evName], c)
	xs.LogSillyf("XS EventOn: sockEvents[\"%s\"]: len %d", evName, len(xs.sockEvents[evName]))
	return c.id, nil
}

// EventOff Un-register a (or all) callbacks associated to an event
func (xs *XdsServer) EventOff(evName string, id uuid.UUID) error {
	xs.sockEventsLock.Lock()
	defer xs.sockEventsLock.Unlock()
	if _, exist := xs.sockEvents[evName]; exist {
		if id == uuid.Nil {
			// Un-register all
			xs.sockEvents[evName] = []*caller{}
		} else {
			// Un-register only the specified callback
			for i, ff := range xs.sockEvents[evName] {
				if uuid.Equal(ff.id, id) {
					xs.sockEvents[evName] = append(xs.sockEvents[evName][:i], xs.sockEvents[evName][i+1:]...)
					break
				}
			}
		}
	}
	xs.LogSillyf("XS EventOff: sockEvents[\"%s\"]: len %d", evName, len(xs.sockEvents[evName]))
	return nil
}

// ProjectToFolder Convert Project structure to Folder structure
func (xs *XdsServer) ProjectToFolder(pPrj xaapiv1.ProjectConfig) *xsapiv1.FolderConfig {
	stID := ""
	if pPrj.Type == xsapiv1.TypeCloudSync {
		stID, _ = xs.SThg.IDGet()
	}
	// TODO: limit ClientData size and gzip it (see https://golang.org/pkg/compress/gzip/)
	fPrj := xsapiv1.FolderConfig{
		ID:         pPrj.ID,
		Label:      pPrj.Label,
		ClientPath: pPrj.ClientPath,
		Type:       xsapiv1.FolderType(pPrj.Type),
		Status:     pPrj.Status,
		IsInSync:   pPrj.IsInSync,
		DefaultSdk: pPrj.DefaultSdk,
		ClientData: pPrj.ClientData,
		DataPathMap: xsapiv1.PathMapConfig{
			ServerPath: pPrj.ServerPath,
		},
		DataCloudSync: xsapiv1.CloudSyncConfig{
			SyncThingID:   stID,
			STLocIsInSync: pPrj.IsInSync,
			STLocStatus:   pPrj.Status,
			STSvrIsInSync: pPrj.IsInSync,
			STSvrStatus:   pPrj.Status,
		},
	}

	return &fPrj
}

// FolderToProject Convert Folder structure to Project structure
func (xs *XdsServer) FolderToProject(fPrj xsapiv1.FolderConfig) xaapiv1.ProjectConfig {
	inSync := fPrj.IsInSync
	sts := fPrj.Status

	if fPrj.Type == xsapiv1.TypeCloudSync {
		inSync = fPrj.DataCloudSync.STSvrIsInSync && fPrj.DataCloudSync.STLocIsInSync

		sts = fPrj.DataCloudSync.STSvrStatus
		switch fPrj.DataCloudSync.STLocStatus {
		case xaapiv1.StatusErrorConfig, xaapiv1.StatusDisable, xaapiv1.StatusPause:
			sts = fPrj.DataCloudSync.STLocStatus
			break
		case xaapiv1.StatusSyncing:
			if sts != xaapiv1.StatusErrorConfig && sts != xaapiv1.StatusDisable && sts != xaapiv1.StatusPause {
				sts = xaapiv1.StatusSyncing
			}
			break
		case xaapiv1.StatusEnable:
			// keep STSvrStatus
			break
		}
	}

	pPrj := xaapiv1.ProjectConfig{
		ID:         fPrj.ID,
		ServerID:   xs.ID,
		Label:      fPrj.Label,
		ClientPath: fPrj.ClientPath,
		ServerPath: fPrj.DataPathMap.ServerPath,
		Type:       xaapiv1.ProjectType(fPrj.Type),
		Status:     sts,
		IsInSync:   inSync,
		DefaultSdk: fPrj.DefaultSdk,
		ClientData: fPrj.ClientData,
	}
	return pPrj
}

// CommandAdd Add a new command to the list of running commands
func (xs *XdsServer) CommandAdd(cmdID string, data interface{}) error {
	if xs.CommandGet(cmdID) != nil {
		return fmt.Errorf("command id already exist")
	}
	xs.cmdList[cmdID] = data
	return nil
}

// CommandDelete Delete a command from the command list
func (xs *XdsServer) CommandDelete(cmdID string) error {
	if xs.CommandGet(cmdID) == nil {
		return fmt.Errorf("unknown command id")
	}
	delete(xs.cmdList, cmdID)
	return nil
}

// CommandGet Retrieve a command data
func (xs *XdsServer) CommandGet(cmdID string) interface{} {
	d, exist := xs.cmdList[cmdID]
	if exist {
		return d
	}
	return nil
}

/***
** Private functions
***/

// Create HTTP client
func (xs *XdsServer) _CreateConnectHTTP() error {
	var err error
	xs.client, err = common.HTTPNewClient(xs.BaseURL,
		common.HTTPClientConfig{
			URLPrefix:           "/api/v1",
			HeaderClientKeyName: "Xds-Sid",
			CsrfDisable:         true,
			LogOut:              xs.logOut,
			LogPrefix:           "XDSSERVER: ",
			LogLevel:            common.HTTPLogLevelWarning,
		})

	xs.client.SetLogLevel(xs.Log.Level.String())

	if err != nil {
		msg := ": " + err.Error()
		if strings.Contains(err.Error(), "connection refused") {
			msg = fmt.Sprintf("(url: %s)", xs.BaseURL)
		}
		return fmt.Errorf("ERROR: cannot connect to XDS Server %s", msg)
	}
	if xs.client == nil {
		return fmt.Errorf("ERROR: cannot connect to XDS Server (null client)")
	}

	return nil
}

// _Reconnect Re-established connection
func (xs *XdsServer) _Reconnect() error {
	err := xs._Connect(true)
	if err == nil {
		// Reload projects list for this server
		err = xs.projects.Init(xs)
	}
	if err == nil {
		// Register again to all events
		err = xs.EventRegister(xsapiv1.EVTAll, "")
	}
	return err
}

// _Connect Established HTTP and WS connection and retrieve XDSServer config
func (xs *XdsServer) _Connect(reConn bool) error {

	xdsCfg := xsapiv1.APIConfig{}
	if err := xs.client.Get("/config", &xdsCfg); err != nil {
		xs.Connected = false
		if !reConn {
			xs._NotifyState()
		}
		return err
	}

	if reConn && xs.ID != xdsCfg.ServerUID {
		xs.Log.Warningf("Reconnected to server but ID differs: old=%s, new=%s", xs.ID, xdsCfg.ServerUID)
	}

	// Update local XDS config
	xs.ID = xdsCfg.ServerUID
	xs.ServerConfig = &xdsCfg

	// Establish WS connection and register listen
	if err := xs._SocketConnect(); err != nil {
		xs._Disconnected()
		return err
	}

	xs.Connected = true
	xs._NotifyState()
	return nil
}

// _SocketConnect Create WebSocket (io.socket) connection
func (xs *XdsServer) _SocketConnect() error {

	xs.Log.Infof("Connecting IO.socket for server %s (url %s)", xs.ID, xs.BaseURL)

	opts := &sio_client.Options{
		Transport: "websocket",
		Header:    make(map[string][]string),
	}
	opts.Header["XDS-SID"] = []string{xs.client.GetClientID()}

	iosk, err := sio_client.NewClient(xs.BaseURL, opts)
	if err != nil {
		return fmt.Errorf("IO.socket connection error for server %s: %v", xs.ID, err)
	}
	xs.ioSock = iosk

	// Register some listeners

	iosk.On("error", func(err error) {
		xs.Log.Infof("IO.socket Error server %s; err: %v", xs.ID, err)
		if xs.CBOnError != nil {
			xs.CBOnError(err)
		}
	})

	iosk.On("disconnection", func(err error) {
		xs.Log.Infof("IO.socket disconnection server %s", xs.ID)
		if xs.CBOnDisconnect != nil {
			xs.CBOnDisconnect(err)
		}
		xs._Disconnected()

		// Try to reconnect during 15min (or at least while not disabled)
		go func() {
			count := 0
			waitTime := 1
			for !xs.Disabled && !xs.Connected {
				count++
				if count%60 == 0 {
					waitTime *= 5
				}
				if waitTime > 15*60 {
					xs.Log.Infof("Stop reconnection to server url=%s id=%s !", xs.BaseURL, xs.ID)
					return
				}
				time.Sleep(time.Second * time.Duration(waitTime))
				xs.Log.Infof("Try to reconnect to server %s (%d)", xs.BaseURL, count)

				err := xs._Reconnect()
				if err != nil &&
					!(strings.Contains(err.Error(), "dial tcp") && strings.Contains(err.Error(), "connection refused")) {
					xs.Log.Errorf("ERROR while reconnecting: %v", err.Error())
				}

			}
		}()
	})

	// XXX - There is no connection event generated so, just consider that
	// we are connected when NewClient return successfully
	/* iosk.On("connection", func() { ... }) */
	xs.Log.Infof("IO.socket connected server url=%s id=%s", xs.BaseURL, xs.ID)

	return nil
}

// _Disconnected Set XDS Server as disconnected
func (xs *XdsServer) _Disconnected() error {
	// Clear all register events as socket is closed
	for k := range xs.sockEvents {
		delete(xs.sockEvents, k)
	}
	xs.Connected = false
	xs.ioSock = nil
	xs._NotifyState()
	return nil
}

// _NotifyState Send event to notify changes
func (xs *XdsServer) _NotifyState() {

	evSts := xaapiv1.ServerCfg{
		ID:         xs.ID,
		URL:        xs.BaseURL,
		APIURL:     xs.APIURL,
		PartialURL: xs.PartialURL,
		ConnRetry:  xs.ConnRetry,
		Connected:  xs.Connected,
	}
	if err := xs.events.Emit(xaapiv1.EVTServerConfig, evSts, ""); err != nil {
		xs.Log.Warningf("Cannot notify XdsServer state change: %v", err)
	}
}