2 # NEPI, a framework to manage network experiments
3 # Copyright (C) 2013 INRIA
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 # Author: Alina Quereilhac <alina.quereilhac@inria.fr>
20 from nepi.execution.attribute import Attribute, Flags, Types
21 from nepi.execution.trace import Trace, TraceAttr
22 from nepi.execution.resource import ResourceManager, clsinit, ResourceState, \
24 from nepi.resources.linux.node import LinuxNode
25 from nepi.util.sshfuncs import ProcStatus
26 from nepi.util.timefuncs import tnow, tdiffsec
31 # TODO: Resolve wildcards in commands!!
32 # TODO: During provisioning, everything that is not scp could be
33 # uploaded to a same script, http_sources download, etc...
34 # and like that require performing less ssh connections!!!
35 # TODO: Make stdin be a symlink to the original file in ${SHARE}
36 # - later use md5sum to check wether the file needs to be re-upload
40 class LinuxApplication(ResourceManager):
42 .. class:: Class Args :
44 :param ec: The Experiment controller
45 :type ec: ExperimentController
46 :param guid: guid of the RM
51 A LinuxApplication RM represents a process that can be executed in
52 a remote Linux host using SSH.
54 The LinuxApplication RM takes care of uploadin sources and any files
55 needed to run the experiment, to the remote host.
56 It also allows to provide source compilation (build) and installation
57 instructions, and takes care of automating the sources build and
58 installation tasks for the user.
60 It is important to note that files uploaded to the remote host have
61 two possible scopes: single-experiment or multi-experiment.
62 Single experiment files are those that will not be re-used by other
63 experiments. Multi-experiment files are those that will.
64 Sources and shared files are always made available to all experiments.
68 The directory structure used by LinuxApplication RM at the Linux
69 host is the following:
71 ${HOME}/nepi-usr --> Base directory for multi-experiment files
73 ${LIB} |- /lib --> Base directory for libraries
74 ${BIN} |- /bin --> Base directory for binary files
75 ${SRC} |- /src --> Base directory for sources
76 ${SHARE} |- /share --> Base directory for other files
78 ${HOME}/nepi-exp --> Base directory for single-experiment files
80 ${EXP_HOME} |- /<exp-id> --> Base directory for experiment exp-id
82 ${APP_HOME} |- /<app-guid> --> Base directory for application
83 | specific files (e.g. command.sh, input)
85 ${RUN_HOME} |- /<run-id> --> Base directory for run specific
89 _rtype = "LinuxApplication"
92 def _register_attributes(cls):
93 command = Attribute("command", "Command to execute at application start. "
94 "Note that commands will be executed in the ${RUN_HOME} directory, "
95 "make sure to take this into account when using relative paths. ",
96 flags = Flags.ExecReadOnly)
97 forward_x11 = Attribute("forwardX11", "Enables X11 forwarding for SSH connections",
98 flags = Flags.ExecReadOnly)
99 env = Attribute("env", "Environment variables string for command execution",
100 flags = Flags.ExecReadOnly)
101 sudo = Attribute("sudo", "Run with root privileges",
102 flags = Flags.ExecReadOnly)
103 depends = Attribute("depends",
104 "Space-separated list of packages required to run the application",
105 flags = Flags.ExecReadOnly)
106 sources = Attribute("sources",
107 "Space-separated list of regular files to be uploaded to ${SRC} "
108 "directory prior to building. Archives won't be expanded automatically. "
109 "Sources are globally available for all experiments unless "
110 "cleanHome is set to True (This will delete all sources). ",
111 flags = Flags.ExecReadOnly)
112 files = Attribute("files",
113 "Space-separated list of regular miscellaneous files to be uploaded "
114 "to ${SHARE} directory. "
115 "Files are globally available for all experiments unless "
116 "cleanHome is set to True (This will delete all files). ",
117 flags = Flags.ExecReadOnly)
118 libs = Attribute("libs",
119 "Space-separated list of libraries (e.g. .so files) to be uploaded "
120 "to ${LIB} directory. "
121 "Libraries are globally available for all experiments unless "
122 "cleanHome is set to True (This will delete all files). ",
123 flags = Flags.ExecReadOnly)
124 bins = Attribute("bins",
125 "Space-separated list of binary files to be uploaded "
126 "to ${BIN} directory. "
127 "Binaries are globally available for all experiments unless "
128 "cleanHome is set to True (This will delete all files). ",
129 flags = Flags.ExecReadOnly)
130 code = Attribute("code",
131 "Plain text source code to be uploaded to the ${APP_HOME} directory. ",
132 flags = Flags.ExecReadOnly)
133 build = Attribute("build",
134 "Build commands to execute after deploying the sources. "
135 "Sources are uploaded to the ${SRC} directory and code "
136 "is uploaded to the ${APP_HOME} directory. \n"
137 "Usage example: tar xzf ${SRC}/my-app.tgz && cd my-app && "
138 "./configure && make && make clean.\n"
139 "Make sure to make the build commands return with a nonzero exit "
141 flags = Flags.ReadOnly)
142 install = Attribute("install",
143 "Commands to transfer built files to their final destinations. "
144 "Install commands are executed after build commands. ",
145 flags = Flags.ReadOnly)
146 stdin = Attribute("stdin", "Standard input for the 'command'",
147 flags = Flags.ExecReadOnly)
148 tear_down = Attribute("tearDown", "Command to be executed just before "
149 "releasing the resource",
150 flags = Flags.ReadOnly)
152 cls._register_attribute(command)
153 cls._register_attribute(forward_x11)
154 cls._register_attribute(env)
155 cls._register_attribute(sudo)
156 cls._register_attribute(depends)
157 cls._register_attribute(sources)
158 cls._register_attribute(code)
159 cls._register_attribute(files)
160 cls._register_attribute(bins)
161 cls._register_attribute(libs)
162 cls._register_attribute(build)
163 cls._register_attribute(install)
164 cls._register_attribute(stdin)
165 cls._register_attribute(tear_down)
168 def _register_traces(cls):
169 stdout = Trace("stdout", "Standard output stream")
170 stderr = Trace("stderr", "Standard error stream")
172 cls._register_trace(stdout)
173 cls._register_trace(stderr)
175 def __init__(self, ec, guid):
176 super(LinuxApplication, self).__init__(ec, guid)
179 self._home = "app-%s" % self.guid
180 self._in_foreground = False
182 # keep a reference to the running process handler when
183 # the command is not executed as remote daemon in background
186 # timestamp of last state check of the application
187 self._last_state_check = tnow()
189 def log_message(self, msg):
190 return " guid %d - host %s - %s " % (self.guid,
191 self.node.get("hostname"), msg)
195 node = self.get_connected(LinuxNode.rtype())
196 if node: return node[0]
201 return os.path.join(self.node.exp_home, self._home)
205 return os.path.join(self.app_home, self.ec.run_id)
216 def in_foreground(self):
217 """ Returns True if the command needs to be executed in foreground.
218 This means that command will be executed using 'execute' instead of
219 'run' ('run' executes a command in background and detached from the
222 When using X11 forwarding option, the command can not run in background
223 and detached from a terminal, since we need to keep the terminal attached
226 return self.get("forwardX11") or self._in_foreground
228 def trace(self, name, attr = TraceAttr.ALL, block = 512, offset = 0):
229 self.info("Retrieving '%s' trace %s " % (name, attr))
231 path = os.path.join(self.run_home, name)
233 command = "(test -f %s && echo 'success') || echo 'error'" % path
234 (out, err), proc = self.node.execute(command)
236 if (err and proc.poll()) or out.find("error") != -1:
237 msg = " Couldn't find trace %s " % name
238 self.error(msg, out, err)
241 if attr == TraceAttr.PATH:
244 if attr == TraceAttr.ALL:
245 (out, err), proc = self.node.check_output(self.run_home, name)
247 if err and proc.poll():
248 msg = " Couldn't read trace %s " % name
249 self.error(msg, out, err)
254 if attr == TraceAttr.STREAM:
255 cmd = "dd if=%s bs=%d count=1 skip=%d" % (path, block, offset)
256 elif attr == TraceAttr.SIZE:
257 cmd = "stat -c%%s %s " % path
259 (out, err), proc = self.node.execute(cmd)
261 if err and proc.poll():
262 msg = " Couldn't find trace %s " % name
263 self.error(msg, out, err)
266 if attr == TraceAttr.SIZE:
267 out = int(out.strip())
272 # create run dir for application
273 self.node.mkdir(self.run_home)
275 # List of all the provision methods to invoke
282 self.upload_binaries,
284 self.upload_libraries,
289 # install dependencies
290 self.install_dependencies,
298 # Since provisioning takes a long time, before
299 # each step we check that the EC is still
302 raise RuntimeError, "EC finished"
308 # upload deploy script
309 deploy_command = ";".join(command)
310 self.execute_deploy_command(deploy_command)
312 # upload start script
313 self.upload_start_command()
315 self.info("Provisioning finished")
317 super(LinuxApplication, self).provision()
319 def upload_start_command(self):
320 # Upload command to remote bash script
321 # - only if command can be executed in background and detached
322 command = self.get("command")
324 if command and not self.in_foreground:
325 self.info("Uploading command '%s'" % command)
327 # replace application specific paths in the command
328 command = self.replace_paths(command)
330 # replace application specific paths in the environment
331 env = self.get("env")
332 env = env and self.replace_paths(env)
334 shfile = os.path.join(self.app_home, "start.sh")
336 self.node.upload_command(command,
340 def execute_deploy_command(self, command):
342 # Upload the command to a bash script and run it
343 # in background ( but wait until the command has
344 # finished to continue )
345 shfile = os.path.join(self.app_home, "deploy.sh")
346 self.node.run_and_wait(command, self.run_home,
349 pidfile = "deploy_pidfile",
350 ecodefile = "deploy_exitcode",
351 stdout = "deploy_stdout",
352 stderr = "deploy_stderr")
354 def upload_sources(self):
355 sources = self.get("sources")
360 self.info("Uploading sources ")
362 sources = sources.split(' ')
364 # Separate sources that should be downloaded from
365 # the web, from sources that should be uploaded from
368 for source in list(sources):
369 if source.startswith("http") or source.startswith("https"):
370 # remove the hhtp source from the sources list
371 sources.remove(source)
373 command.append( " ( "
374 # Check if the source already exists
375 " ls ${SRC}/%(basename)s "
377 # If source doesn't exist, download it and check
378 # that it it downloaded ok
379 " wget -c --directory-prefix=${SRC} %(source)s && "
380 " ls ${SRC}/%(basename)s "
382 "basename": os.path.basename(source),
386 command = " && ".join(command)
388 # replace application specific paths in the command
389 command = self.replace_paths(command)
392 sources = ' '.join(sources)
393 self.node.upload(sources, self.node.src_dir, overwrite = False)
397 def upload_files(self):
398 files = self.get("files")
401 self.info("Uploading files %s " % files)
402 self.node.upload(files, self.node.share_dir, overwrite = False)
404 def upload_libraries(self):
405 libs = self.get("libs")
408 self.info("Uploading libraries %s " % libaries)
409 self.node.upload(libs, self.node.lib_dir, overwrite = False)
411 def upload_binaries(self):
412 bins = self.get("bins")
415 self.info("Uploading binaries %s " % binaries)
416 self.node.upload(bins, self.node.bin_dir, overwrite = False)
418 def upload_code(self):
419 code = self.get("code")
422 self.info("Uploading code")
424 dst = os.path.join(self.app_home, "code")
425 self.node.upload(code, dst, overwrite = False, text = True)
427 def upload_stdin(self):
428 stdin = self.get("stdin")
430 # create dir for sources
431 self.info("Uploading stdin")
433 dst = os.path.join(self.app_home, "stdin")
434 self.node.upload(stdin, dst, overwrite = False, text = True)
436 def install_dependencies(self):
437 depends = self.get("depends")
439 self.info("Installing dependencies %s" % depends)
440 self.node.install_packages(depends, self.app_home, self.run_home)
443 build = self.get("build")
446 self.info("Building sources ")
448 # replace application specific paths in the command
449 return self.replace_paths(build)
452 install = self.get("install")
455 self.info("Installing sources ")
457 # replace application specific paths in the command
458 return self.replace_paths(install)
461 # Wait until node is associated and deployed
463 if not node or node.state < ResourceState.READY:
464 self.debug("---- RESCHEDULING DEPLOY ---- node state %s " % self.node.state )
465 self.ec.schedule(reschedule_delay, self.deploy)
468 command = self.get("command") or ""
469 self.info("Deploying command '%s' " % command)
476 super(LinuxApplication, self).deploy()
479 command = self.get("command")
481 self.info("Starting command '%s'" % command)
484 # If no command was given (i.e. Application was used for dependency
485 # installation), then the application is directly marked as FINISHED
486 self._state = ResourceState.FINISHED
489 if self.in_foreground:
490 self._start_in_foreground()
492 self._start_in_background()
494 super(LinuxApplication, self).start()
496 def _start_in_foreground(self):
497 command = self.get("command")
498 sudo = self.get("sudo") or False
499 x11 = self.get("forwardX11")
501 # For a command being executed in foreground, if there is stdin,
502 # it is expected to be text string not a file or pipe
503 stdin = self.get("stdin") or None
505 # Command will be launched in foreground and attached to the
506 # terminal using the node 'execute' in non blocking mode.
509 env = self.get("env")
510 environ = self.node.format_environment(env, inline = True)
511 command = environ + command
512 command = self.replace_paths(command)
514 # We save the reference to the process in self._proc
515 # to be able to kill the process from the stop method.
516 # We also set blocking = False, since we don't want the
517 # thread to block until the execution finishes.
518 (out, err), self._proc = self.node.execute(command,
524 if self._proc.poll():
526 self.error(msg, out, err)
527 raise RuntimeError, msg
529 def _start_in_background(self):
530 command = self.get("command")
531 env = self.get("env")
532 sudo = self.get("sudo") or False
536 stdin = os.path.join(self.app_home, "stdin") if self.get("stdin") \
539 # Command will be run as a daemon in baground and detached from any
541 # The command to run was previously uploaded to a bash script
542 # during deployment, now we launch the remote script using 'run'
543 # method from the node.
544 cmd = "bash %s" % os.path.join(self.app_home, "start.sh")
545 (out, err), proc = self.node.run(cmd, self.run_home,
551 # check if execution errors occurred
552 msg = " Failed to start command '%s' " % command
556 self.error(msg, out, err)
557 raise RuntimeError, msg
559 # Wait for pid file to be generated
560 pid, ppid = self.node.wait_pid(self.run_home)
561 if pid: self._pid = int(pid)
562 if ppid: self._ppid = int(ppid)
564 # If the process is not running, check for error information
565 # on the remote machine
566 if not self.pid or not self.ppid:
567 (out, err), proc = self.node.check_errors(self.run_home,
570 # Out is what was written in the stderr file
573 msg = " Failed to start command '%s' " % command
574 self.error(msg, out, err)
575 raise RuntimeError, msg
578 """ Stops application execution
580 command = self.get('command') or ''
582 if self.state == ResourceState.STARTED:
585 self.info("Stopping command '%s'" % command)
587 # If the command is running in foreground (it was launched using
588 # the node 'execute' method), then we use the handler to the Popen
589 # process to kill it. Else we send a kill signal using the pid and ppid
590 # retrieved after running the command with the node 'run' method
595 # Only try to kill the process if the pid and ppid
597 if self.pid and self.ppid:
598 (out, err), proc = self.node.kill(self.pid, self.ppid)
601 # check if execution errors occurred
602 msg = " Failed to STOP command '%s' " % self.get("command")
603 self.error(msg, out, err)
608 super(LinuxApplication, self).stop()
611 self.info("Releasing resource")
613 tear_down = self.get("tearDown")
615 self.node.execute(tear_down)
619 if self.state == ResourceState.STOPPED:
620 super(LinuxApplication, self).release()
624 """ Returns the state of the application
626 if self._state == ResourceState.STARTED:
627 if self.in_foreground:
628 # Check if the process we used to execute the command
629 # is still running ...
630 retcode = self._proc.poll()
632 # retcode == None -> running
633 # retcode > 0 -> error
634 # retcode == 0 -> finished
637 msg = " Failed to execute command '%s'" % self.get("command")
638 err = self._proc.stderr.read()
639 self.error(msg, out, err)
642 self._state = ResourceState.FINISHED
645 # We need to query the status of the command we launched in
646 # background. In oredr to avoid overwhelming the remote host and
647 # the local processor with too many ssh queries, the state is only
648 # requested every 'state_check_delay' seconds.
649 state_check_delay = 0.5
650 if tdiffsec(tnow(), self._last_state_check) > state_check_delay:
651 # check if execution errors occurred
652 (out, err), proc = self.node.check_errors(self.run_home)
655 msg = " Failed to execute command '%s'" % self.get("command")
656 self.error(msg, out, err)
659 elif self.pid and self.ppid:
660 # No execution errors occurred. Make sure the background
661 # process with the recorded pid is still running.
662 status = self.node.status(self.pid, self.ppid)
664 if status == ProcStatus.FINISHED:
665 self._state = ResourceState.FINISHED
667 self._last_state_check = tnow()
671 def replace_paths(self, command):
673 Replace all special path tags with shell-escaped actual paths.
676 .replace("${USR}", self.node.usr_dir)
677 .replace("${LIB}", self.node.lib_dir)
678 .replace("${BIN}", self.node.bin_dir)
679 .replace("${SRC}", self.node.src_dir)
680 .replace("${SHARE}", self.node.share_dir)
681 .replace("${EXP}", self.node.exp_dir)
682 .replace("${EXP_HOME}", self.node.exp_home)
683 .replace("${APP_HOME}", self.app_home)
684 .replace("${RUN_HOME}", self.run_home)
685 .replace("${NODE_HOME}", self.node.node_home)
686 .replace("${HOME}", self.node.home_dir)
689 def valid_connection(self, guid):