summaryrefslogtreecommitdiffstats
path: root/lib/syncthing/st.go
blob: 660738d6456a2a349c2432bb95d53352f1a5a94f (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
package st

import (
	"encoding/json"
	"io"
	"io/ioutil"
	"os"
	"path"
	"path/filepath"
	"regexp"
	"strings"
	"syscall"
	"time"

	"fmt"

	"os/exec"

	"github.com/Sirupsen/logrus"
	"github.com/iotbzh/xds-agent/lib/xdsconfig"
	common "github.com/iotbzh/xds-common/golib"
	"github.com/syncthing/syncthing/lib/config"
)

// SyncThing .
type SyncThing struct {
	BaseURL string
	APIKey  string
	Home    string
	STCmd   *exec.Cmd
	STICmd  *exec.Cmd

	// Private fields
	binDir      string
	logsDir     string
	exitSTChan  chan ExitChan
	exitSTIChan chan ExitChan
	client      *common.HTTPClient
	log         *logrus.Logger
}

// ExitChan Channel used for process exit
type ExitChan struct {
	status int
	err    error
}

// NewSyncThing creates a new instance of Syncthing
func NewSyncThing(conf *xdsconfig.Config, log *logrus.Logger) *SyncThing {
	var url, apiKey, home, binDir string

	stCfg := conf.FileConf.SThgConf
	if stCfg != nil {
		url = stCfg.GuiAddress
		apiKey = stCfg.GuiAPIKey
		home = stCfg.Home
		binDir = stCfg.BinDir
	}

	if url == "" {
		url = "http://localhost:8384"
	}
	if url[0:7] != "http://" {
		url = "http://" + url
	}

	if home == "" {
		panic("home parameter must be set")
	}

	s := SyncThing{
		BaseURL: url,
		APIKey:  apiKey,
		Home:    home,
		binDir:  binDir,
		logsDir: conf.FileConf.LogsDir,
		log:     log,
	}

	return &s
}

// Start Starts syncthing process
func (s *SyncThing) startProc(exeName string, args []string, env []string, eChan *chan ExitChan) (*exec.Cmd, error) {
	var err error
	var exePath string

	// Kill existing process (useful for debug ;-) )
	if os.Getenv("DEBUG_MODE") != "" {
		exec.Command("bash", "-c", "pkill -9 "+exeName).Output()
	}

	// When not set (or set to '.') set bin to path of xds-agent executable
	bdir := s.binDir
	if bdir == "" || bdir == "." {
		exe, _ := os.Executable()
		if exeAbsPath, err := filepath.Abs(exe); err == nil {
			if exePath, err := filepath.EvalSymlinks(exeAbsPath); err == nil {
				bdir = filepath.Dir(exePath)
			}
		}
	}

	exePath, err = exec.LookPath(path.Join(bdir, exeName))
	if err != nil {
		// Let's try in /opt/AGL/bin
		exePath, err = exec.LookPath(path.Join("opt", "AGL", "bin", exeName))
		if err != nil {
			return nil, fmt.Errorf("Cannot find %s executable in %s", exeName, bdir)
		}
	}
	cmd := exec.Command(exePath, args...)
	cmd.Env = os.Environ()
	for _, ev := range env {
		cmd.Env = append(cmd.Env, ev)
	}

	// open log file
	var outfile *os.File
	logFilename := filepath.Join(s.logsDir, exeName+".log")
	if s.logsDir != "" {
		outfile, err := os.Create(logFilename)
		if err != nil {
			return nil, fmt.Errorf("Cannot create log file %s", logFilename)
		}

		cmdOut, err := cmd.StdoutPipe()
		if err != nil {
			return nil, fmt.Errorf("Pipe stdout error for : %s", err)
		}

		go io.Copy(outfile, cmdOut)
	}

	err = cmd.Start()
	if err != nil {
		return nil, err
	}

	*eChan = make(chan ExitChan, 1)
	go func(c *exec.Cmd, oF *os.File) {
		status := 0
		sts, err := c.Process.Wait()
		if !sts.Success() {
			s := sts.Sys().(syscall.WaitStatus)
			status = s.ExitStatus()
		}
		if oF != nil {
			oF.Close()
		}
		s.log.Debugf("%s exited with status %d, err %v", exeName, status, err)

		*eChan <- ExitChan{status, err}
	}(cmd, outfile)

	return cmd, nil
}

// Start Starts syncthing process
func (s *SyncThing) Start() (*exec.Cmd, error) {
	var err error

	s.log.Infof(" ST home=%s", s.Home)
	s.log.Infof(" ST  url=%s", s.BaseURL)

	args := []string{
		"--home=" + s.Home,
		"-no-browser",
		"--gui-address=" + s.BaseURL,
	}

	if s.APIKey != "" {
		args = append(args, "-gui-apikey=\""+s.APIKey+"\"")
		s.log.Infof(" ST apikey=%s", s.APIKey)
	}
	if s.log.Level == logrus.DebugLevel {
		args = append(args, "-verbose")
	}

	env := []string{
		"STNODEFAULTFOLDER=1",
		"STNOUPGRADE=1",
	}

	// XXX - temporary hack because -gui-apikey seems to correctly handle by
	// syncthing the early first time
	stConfigFile := filepath.Join(s.Home, "config.xml")
	if s.APIKey != "" && !common.Exists(stConfigFile) {
		s.log.Infof("Stop and restart Syncthing (hack for apikey setting)")
		s.STCmd, err = s.startProc("syncthing", args, env, &s.exitSTChan)
		tmo := 20
		for ; tmo > 0; tmo-- {
			s.log.Debugf("Waiting Syncthing config.xml creation (%v)\n", tmo)
			time.Sleep(500 * time.Millisecond)
			if common.Exists(stConfigFile) {
				break
			}
		}
		if tmo <= 0 {
			return nil, fmt.Errorf("Cannot start Syncthing for config file creation")
		}
		s.Stop()
		read, err := ioutil.ReadFile(stConfigFile)
		if err != nil {
			return nil, fmt.Errorf("Cannot read Syncthing config file for apikey setting")
		}
		re := regexp.MustCompile(`<apikey>.*</apikey>`)
		newContents := re.ReplaceAllString(string(read), "<apikey>"+s.APIKey+"</apikey>")
		err = ioutil.WriteFile(stConfigFile, []byte(newContents), 0)
		if err != nil {
			return nil, fmt.Errorf("Cannot write Syncthing config file to set apikey")
		}
	}

	s.STCmd, err = s.startProc("syncthing", args, env, &s.exitSTChan)

	// Use autogenerated apikey if not set by config.json
	if s.APIKey == "" {
		if fd, err := os.Open(stConfigFile); err == nil {
			defer fd.Close()
			if b, err := ioutil.ReadAll(fd); err == nil {
				re := regexp.MustCompile("<apikey>(.*)</apikey>")
				key := re.FindStringSubmatch(string(b))
				if len(key) >= 1 {
					s.APIKey = key[1]
				}
			}
		}
	}

	return s.STCmd, err
}

// StartInotify Starts syncthing-inotify process
func (s *SyncThing) StartInotify() (*exec.Cmd, error) {
	var err error
	exeName := "syncthing-inotify"

	s.log.Infof(" STI  url=%s", s.BaseURL)

	args := []string{
		"-target=" + s.BaseURL,
	}
	if s.APIKey != "" {
		args = append(args, "-api="+s.APIKey)
		s.log.Infof("%s uses apikey=%s", exeName, s.APIKey)
	}
	if s.log.Level == logrus.DebugLevel {
		args = append(args, "-verbosity=4")
	}

	env := []string{}

	s.STICmd, err = s.startProc(exeName, args, env, &s.exitSTIChan)

	return s.STICmd, err
}

func (s *SyncThing) stopProc(pname string, proc *os.Process, exit chan ExitChan) {
	if err := proc.Signal(os.Interrupt); err != nil {
		s.log.Infof("Proc interrupt %s error: %s", pname, err.Error())

		select {
		case <-exit:
		case <-time.After(time.Second):
			// A bigger bonk on the head.
			if err := proc.Signal(os.Kill); err != nil {
				s.log.Infof("Proc term %s error: %s", pname, err.Error())
			}
			<-exit
		}
	}
	s.log.Infof("%s stopped (PID %d)", pname, proc.Pid)
}

// Stop Stops syncthing process
func (s *SyncThing) Stop() {
	if s.STCmd == nil {
		return
	}
	s.stopProc("syncthing", s.STCmd.Process, s.exitSTChan)
	s.STCmd = nil
}

// StopInotify Stops syncthing process
func (s *SyncThing) StopInotify() {
	if s.STICmd == nil {
		return
	}
	s.stopProc("syncthing-inotify", s.STICmd.Process, s.exitSTIChan)
	s.STICmd = nil
}

// Connect Establish HTTP connection with Syncthing
func (s *SyncThing) Connect() error {
	var err error
	s.client, err = common.HTTPNewClient(s.BaseURL,
		common.HTTPClientConfig{
			URLPrefix:           "/rest",
			HeaderClientKeyName: "X-Syncthing-ID",
		})
	if err != nil {
		msg := ": " + err.Error()
		if strings.Contains(err.Error(), "connection refused") {
			msg = fmt.Sprintf("(url: %s)", s.BaseURL)
		}
		return fmt.Errorf("ERROR: cannot connect to Syncthing %s", msg)
	}
	if s.client == nil {
		return fmt.Errorf("ERROR: cannot connect to Syncthing (null client)")
	}

	s.client.SetLogLevel(s.log.Level.String())
	s.client.LoggerPrefix = "SYNCTHING: "
	s.client.LoggerOut = s.log.Out

	return nil
}

// IDGet returns the Syncthing ID of Syncthing instance running locally
func (s *SyncThing) IDGet() (string, error) {
	var data []byte
	if err := s.client.HTTPGet("system/status", &data); err != nil {
		return "", err
	}
	status := make(map[string]interface{})
	json.Unmarshal(data, &status)
	return status["myID"].(string), nil
}

// ConfigGet returns the current Syncthing configuration
func (s *SyncThing) ConfigGet() (config.Configuration, error) {
	var data []byte
	config := config.Configuration{}
	if err := s.client.HTTPGet("system/config", &data); err != nil {
		return config, err
	}
	err := json.Unmarshal(data, &config)
	return config, err
}

// ConfigSet set Syncthing configuration
func (s *SyncThing) ConfigSet(cfg config.Configuration) error {
	body, err := json.Marshal(cfg)
	if err != nil {
		return err
	}
	return s.client.HTTPPost("system/config", string(body))
}