aboutsummaryrefslogtreecommitdiffstats
path: root/lib/apiv1/exec.go
blob: 4a591be887bc02dc742f57adad4c790edd18dce8 (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
package apiv1

import (
	"fmt"
	"net/http"
	"os"
	"regexp"
	"strconv"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	common "github.com/iotbzh/xds-common/golib"
	"github.com/iotbzh/xds-common/golib/eows"
	"github.com/kr/pty"
)

type (
	// ExecArgs JSON parameters of /exec command
	ExecArgs struct {
		ID              string   `json:"id" binding:"required"`
		SdkID           string   `json:"sdkid"` // sdk ID to use for setting env
		Cmd             string   `json:"cmd" binding:"required"`
		Args            []string `json:"args"`
		Env             []string `json:"env"`
		RPath           string   `json:"rpath"`           // relative path into project
		TTY             bool     `json:"tty"`             // Use a tty, specific to gdb --tty option
		TTYGdbserverFix bool     `json:"ttyGdbserverFix"` // Set to true to activate gdbserver workaround about inferior output
		ExitImmediate   bool     `json:"exitImmediate"`   // when true, exit event sent immediately when command exited (IOW, don't wait file synchronization)
		CmdTimeout      int      `json:"timeout"`         // command completion timeout in Second
	}

	// ExecInMsg Message used to received input characters (stdin)
	ExecInMsg struct {
		CmdID     string `json:"cmdID"`
		Timestamp string `json:"timestamp"`
		Stdin     string `json:"stdin"`
	}

	// ExecOutMsg Message used to send output characters (stdout+stderr)
	ExecOutMsg struct {
		CmdID     string `json:"cmdID"`
		Timestamp string `json:"timestamp"`
		Stdout    string `json:"stdout"`
		Stderr    string `json:"stderr"`
	}

	// ExecExitMsg Message sent when executed command exited
	ExecExitMsg struct {
		CmdID     string `json:"cmdID"`
		Timestamp string `json:"timestamp"`
		Code      int    `json:"code"`
		Error     error  `json:"error"`
	}

	// ExecSignalArgs JSON parameters of /exec/signal command
	ExecSignalArgs struct {
		CmdID  string `json:"cmdID" binding:"required"`  // command id
		Signal string `json:"signal" binding:"required"` // signal number
	}
)

const (
	// ExecInEvent Event send in WS when characters are sent (stdin)
	ExecInEvent = "exec:input"

	// ExecOutEvent Event send in WS when characters are received (stdout or stderr)
	ExecOutEvent = "exec:output"

	// ExecExitEvent Event send in WS when program exited
	ExecExitEvent = "exec:exit"

	// ExecInferiorInEvent Event send in WS when characters are sent to an inferior (used by gdb inferior/tty)
	ExecInferiorInEvent = "exec:inferior-input"

	// ExecInferiorOutEvent Event send in WS when characters are received by an inferior
	ExecInferiorOutEvent = "exec:inferior-output"
)

var execCommandID = 1

// ExecCmd executes remotely a command
func (s *APIService) execCmd(c *gin.Context) {
	var gdbPty, gdbTty *os.File
	var err error
	var args ExecArgs
	if c.BindJSON(&args) != nil {
		common.APIError(c, "Invalid arguments")
		return
	}

	// TODO: add permission ?

	// Retrieve session info
	sess := s.sessions.Get(c)
	if sess == nil {
		common.APIError(c, "Unknown sessions")
		return
	}
	sop := sess.IOSocket
	if sop == nil {
		common.APIError(c, "Websocket not established")
		return
	}

	// Allow to pass id in url (/exec/:id) or as JSON argument
	id := c.Param("id")
	if id == "" {
		id = args.ID
	}
	if id == "" {
		common.APIError(c, "Invalid id")
		return
	}

	f := s.mfolders.Get(id)
	if f == nil {
		common.APIError(c, "Unknown id")
		return
	}
	folder := *f
	prj := folder.GetConfig()

	// Build command line
	cmd := []string{}
	// Setup env var regarding Sdk ID (used for example to setup cross toolchain)
	if envCmd := s.sdks.GetEnvCmd(args.SdkID, prj.DefaultSdk); len(envCmd) > 0 {
		cmd = append(cmd, envCmd...)
		cmd = append(cmd, "&&")
	} else {
		// It's an error if no envcmd found while a sdkid has been provided
		if args.SdkID != "" {
			common.APIError(c, "Unknown sdkid")
			return
		}
	}

	// FIXME - SEB: exec prevents to use syntax:
	//  xds-exec -l debug -c xds-config.env -- "cd build && cmake .."
	cmd = append(cmd, "cd", folder.GetFullPath(args.RPath))
	cmd = append(cmd, "&&", "exec", args.Cmd)

	// Process command arguments
	cmdArgs := make([]string, len(args.Args)+1)
	copy(cmdArgs, args.Args)

	// Allocate pts if tty if used
	if args.TTY {
		gdbPty, gdbTty, err = pty.Open()
		if err != nil {
			common.APIError(c, err.Error())
			return
		}

		s.log.Debugf("Client command tty: %v %v\n", gdbTty.Name(), gdbTty.Name())
		cmdArgs = append(cmdArgs, "--tty="+gdbTty.Name())
	}

	// Unique ID for each commands
	cmdID := strconv.Itoa(execCommandID)
	execCommandID++

	// Create new execution over WS context
	execWS := eows.New(strings.Join(cmd, " "), cmdArgs, sop, sess.ID, cmdID)
	execWS.Log = s.log

	// Append client project dir to environment
	execWS.Env = append(args.Env, "CLIENT_PROJECT_DIR="+prj.ClientPath)

	// Set command execution timeout
	if args.CmdTimeout == 0 {
		// 0 : default timeout
		// TODO get default timeout from config.json file
		execWS.CmdExecTimeout = 24 * 60 * 60 // 1 day
	} else {
		execWS.CmdExecTimeout = args.CmdTimeout
	}

	// Define callback for input (stdin)
	execWS.InputEvent = ExecInEvent
	execWS.InputCB = func(e *eows.ExecOverWS, stdin string) (string, error) {
		s.log.Debugf("STDIN <<%v>>", strings.Replace(stdin, "\n", "\\n", -1))

		// Handle Ctrl-D
		if len(stdin) == 1 && stdin == "\x04" {
			// Close stdin
			errMsg := fmt.Errorf("close stdin: %v", stdin)
			return "", errMsg
		}

		// Set correct path
		data := e.UserData
		rootPath := (*data)["RootPath"].(string)
		clientPath := (*data)["ClientPath"].(string)
		stdin = strings.Replace(stdin, clientPath, rootPath+"/"+clientPath, -1)

		return stdin, nil
	}

	// Define callback for output (stdout+stderr)
	execWS.OutputCB = func(e *eows.ExecOverWS, stdout, stderr string) {
		// IO socket can be nil when disconnected
		so := s.sessions.IOSocketGet(e.Sid)
		if so == nil {
			s.log.Infof("%s not emitted: WS closed (sid:%s, msgid:%s)", ExecOutEvent, e.Sid, e.CmdID)
			return
		}

		// Retrieve project ID and RootPath
		data := e.UserData
		prjID := (*data)["ID"].(string)
		prjRootPath := (*data)["RootPath"].(string)
		gdbServerTTY := (*data)["gdbServerTTY"].(string)

		// Cleanup any references to internal rootpath in stdout & stderr
		stdout = strings.Replace(stdout, prjRootPath, "", -1)
		stderr = strings.Replace(stderr, prjRootPath, "", -1)

		s.log.Debugf("%s emitted - WS sid[4:] %s - id:%s - prjID:%s", ExecOutEvent, e.Sid[4:], e.CmdID, prjID)
		if stdout != "" {
			s.log.Debugf("STDOUT <<%v>>", strings.Replace(stdout, "\n", "\\n", -1))
		}
		if stderr != "" {
			s.log.Debugf("STDERR <<%v>>", strings.Replace(stderr, "\n", "\\n", -1))
		}

		// FIXME replace by .BroadcastTo a room
		err := (*so).Emit(ExecOutEvent, ExecOutMsg{
			CmdID:     e.CmdID,
			Timestamp: time.Now().String(),
			Stdout:    stdout,
			Stderr:    stderr,
		})
		if err != nil {
			s.log.Errorf("WS Emit : %v", err)
		}

		// XXX - Workaround due to gdbserver bug that doesn't redirect
		// inferior output (https://bugs.eclipse.org/bugs/show_bug.cgi?id=437532#c13)
		if gdbServerTTY == "workaround" && len(stdout) > 1 && stdout[0] == '&' {

			// Extract and cleanup string like &"bla bla\n"
			re := regexp.MustCompile("&\"(.*)\"")
			rer := re.FindAllStringSubmatch(stdout, -1)
			out := ""
			if rer != nil && len(rer) > 0 {
				for _, o := range rer {
					if len(o) >= 1 {
						out = strings.Replace(o[1], "\\n", "\n", -1)
						out = strings.Replace(out, "\\r", "\r", -1)
						out = strings.Replace(out, "\\t", "\t", -1)

						s.log.Debugf("STDOUT INFERIOR: <<%v>>", out)
						err := (*so).Emit(ExecInferiorOutEvent, ExecOutMsg{
							CmdID:     e.CmdID,
							Timestamp: time.Now().String(),
							Stdout:    out,
							Stderr:    "",
						})
						if err != nil {
							s.log.Errorf("WS Emit : %v", err)
						}
					}
				}
			} else {
				s.log.Errorf("INFERIOR out parsing error: stdout=<%v>", stdout)
			}
		}
	}

	// Define callback for output
	execWS.ExitCB = func(e *eows.ExecOverWS, code int, err error) {
		s.log.Debugf("Command [Cmd ID %s] exited: code %d, error: %v", e.CmdID, code, err)

		// IO socket can be nil when disconnected
		so := s.sessions.IOSocketGet(e.Sid)
		if so == nil {
			s.log.Infof("%s not emitted - WS closed (id:%s)", ExecExitEvent, e.CmdID)
			return
		}

		// Retrieve project ID and RootPath
		data := e.UserData
		prjID := (*data)["ID"].(string)
		exitImm := (*data)["ExitImmediate"].(bool)

		// XXX - workaround to be sure that Syncthing detected all changes
		if err := s.mfolders.ForceSync(prjID); err != nil {
			s.log.Errorf("Error while syncing folder %s: %v", prjID, err)
		}
		if !exitImm {
			// Wait end of file sync
			// FIXME pass as argument
			tmo := 60
			for t := tmo; t > 0; t-- {
				s.log.Debugf("Wait file in-sync for %s (%d/%d)", prjID, t, tmo)
				if sync, err := s.mfolders.IsFolderInSync(prjID); sync || err != nil {
					if err != nil {
						s.log.Errorf("ERROR IsFolderInSync (%s): %v", prjID, err)
					}
					break
				}
				time.Sleep(time.Second)
			}
		}

		// Close client tty
		if gdbPty != nil {
			gdbPty.Close()
		}
		if gdbTty != nil {
			gdbTty.Close()
		}

		// FIXME replace by .BroadcastTo a room
		errSoEmit := (*so).Emit(ExecExitEvent, ExecExitMsg{
			CmdID:     e.CmdID,
			Timestamp: time.Now().String(),
			Code:      code,
			Error:     err,
		})
		if errSoEmit != nil {
			s.log.Errorf("WS Emit : %v", errSoEmit)
		}
	}

	// User data (used within callbacks)
	data := make(map[string]interface{})
	data["ID"] = prj.ID
	data["RootPath"] = prj.RootPath
	data["ClientPath"] = prj.ClientPath
	data["ExitImmediate"] = args.ExitImmediate
	if args.TTY && args.TTYGdbserverFix {
		data["gdbServerTTY"] = "workaround"
	} else {
		data["gdbServerTTY"] = ""
	}
	execWS.UserData = &data

	// Start command execution
	s.log.Debugf("Execute [Cmd ID %s]: %v %v", execWS.CmdID, execWS.Cmd, execWS.Args)

	err = execWS.Start()
	if err != nil {
		common.APIError(c, err.Error())
		return
	}

	c.JSON(http.StatusOK,
		gin.H{
			"status": "OK",
			"cmdID":  execWS.CmdID,
		})
}

// ExecCmd executes remotely a command
func (s *APIService) execSignalCmd(c *gin.Context) {
	var args ExecSignalArgs

	if c.BindJSON(&args) != nil {
		common.APIError(c, "Invalid arguments")
		return
	}

	s.log.Debugf("Signal %s for command ID %s", args.Signal, args.CmdID)

	e := eows.GetEows(args.CmdID)
	if e == nil {
		common.APIError(c, "unknown cmdID")
		return
	}

	err := e.Signal(args.Signal)
	if err != nil {
		common.APIError(c, err.Error())
		return
	}

	c.JSON(http.StatusOK,
		gin.H{
			"status": "OK",
		})
}