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_copy, \
23 ResourceState, reschedule_delay, failtrap
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: When a failure occurs during deployment, scp and ssh processes are left running behind!!
35 class LinuxApplication(ResourceManager):
37 .. class:: Class Args :
39 :param ec: The Experiment controller
40 :type ec: ExperimentController
41 :param guid: guid of the RM
46 A LinuxApplication RM represents a process that can be executed in
47 a remote Linux host using SSH.
49 The LinuxApplication RM takes care of uploadin sources and any files
50 needed to run the experiment, to the remote host.
51 It also allows to provide source compilation (build) and installation
52 instructions, and takes care of automating the sources build and
53 installation tasks for the user.
55 It is important to note that files uploaded to the remote host have
56 two possible scopes: single-experiment or multi-experiment.
57 Single experiment files are those that will not be re-used by other
58 experiments. Multi-experiment files are those that will.
59 Sources and shared files are always made available to all experiments.
63 The directory structure used by LinuxApplication RM at the Linux
64 host is the following:
66 ${HOME}/nepi-usr --> Base directory for multi-experiment files
68 ${LIB} |- /lib --> Base directory for libraries
69 ${BIN} |- /bin --> Base directory for binary files
70 ${SRC} |- /src --> Base directory for sources
71 ${SHARE} |- /share --> Base directory for other files
73 ${HOME}/nepi-exp --> Base directory for single-experiment files
75 ${EXP_HOME} |- /<exp-id> --> Base directory for experiment exp-id
77 ${APP_HOME} |- /<app-guid> --> Base directory for application
78 | specific files (e.g. command.sh, input)
80 ${RUN_HOME} |- /<run-id> --> Base directory for run specific
84 _rtype = "LinuxApplication"
85 _help = "Runs an application on a Linux host with a BASH command "
86 _backend_type = "linux"
89 def _register_attributes(cls):
90 command = Attribute("command", "Command to execute at application start. "
91 "Note that commands will be executed in the ${RUN_HOME} directory, "
92 "make sure to take this into account when using relative paths. ",
93 flags = Flags.ExecReadOnly)
94 forward_x11 = Attribute("forwardX11", "Enables X11 forwarding for SSH connections",
95 flags = Flags.ExecReadOnly)
96 env = Attribute("env", "Environment variables string for command execution",
97 flags = Flags.ExecReadOnly)
98 sudo = Attribute("sudo", "Run with root privileges",
99 flags = Flags.ExecReadOnly)
100 depends = Attribute("depends",
101 "Space-separated list of packages required to run the application",
102 flags = Flags.ExecReadOnly)
103 sources = Attribute("sources",
104 "Space-separated list of regular files to be uploaded to ${SRC} "
105 "directory prior to building. Archives won't be expanded automatically. "
106 "Sources are globally available for all experiments unless "
107 "cleanHome is set to True (This will delete all sources). ",
108 flags = Flags.ExecReadOnly)
109 files = Attribute("files",
110 "Space-separated list of regular miscellaneous files to be uploaded "
111 "to ${SHARE} directory. "
112 "Files are globally available for all experiments unless "
113 "cleanHome is set to True (This will delete all files). ",
114 flags = Flags.ExecReadOnly)
115 libs = Attribute("libs",
116 "Space-separated list of libraries (e.g. .so files) to be uploaded "
117 "to ${LIB} directory. "
118 "Libraries are globally available for all experiments unless "
119 "cleanHome is set to True (This will delete all files). ",
120 flags = Flags.ExecReadOnly)
121 bins = Attribute("bins",
122 "Space-separated list of binary files to be uploaded "
123 "to ${BIN} directory. "
124 "Binaries are globally available for all experiments unless "
125 "cleanHome is set to True (This will delete all files). ",
126 flags = Flags.ExecReadOnly)
127 code = Attribute("code",
128 "Plain text source code to be uploaded to the ${APP_HOME} directory. ",
129 flags = Flags.ExecReadOnly)
130 build = Attribute("build",
131 "Build commands to execute after deploying the sources. "
132 "Sources are uploaded to the ${SRC} directory and code "
133 "is uploaded to the ${APP_HOME} directory. \n"
134 "Usage example: tar xzf ${SRC}/my-app.tgz && cd my-app && "
135 "./configure && make && make clean.\n"
136 "Make sure to make the build commands return with a nonzero exit "
138 flags = Flags.ReadOnly)
139 install = Attribute("install",
140 "Commands to transfer built files to their final destinations. "
141 "Install commands are executed after build commands. ",
142 flags = Flags.ReadOnly)
143 stdin = Attribute("stdin", "Standard input for the 'command'",
144 flags = Flags.ExecReadOnly)
145 tear_down = Attribute("tearDown", "Command to be executed just before "
146 "releasing the resource",
147 flags = Flags.ReadOnly)
149 cls._register_attribute(command)
150 cls._register_attribute(forward_x11)
151 cls._register_attribute(env)
152 cls._register_attribute(sudo)
153 cls._register_attribute(depends)
154 cls._register_attribute(sources)
155 cls._register_attribute(code)
156 cls._register_attribute(files)
157 cls._register_attribute(bins)
158 cls._register_attribute(libs)
159 cls._register_attribute(build)
160 cls._register_attribute(install)
161 cls._register_attribute(stdin)
162 cls._register_attribute(tear_down)
165 def _register_traces(cls):
166 stdout = Trace("stdout", "Standard output stream")
167 stderr = Trace("stderr", "Standard error stream")
169 cls._register_trace(stdout)
170 cls._register_trace(stderr)
172 def __init__(self, ec, guid):
173 super(LinuxApplication, self).__init__(ec, guid)
176 self._home = "app-%s" % self.guid
177 # whether the command should run in foreground attached
179 self._in_foreground = False
181 # whether to use sudo to kill the application process
182 self._sudo_kill = False
184 # keep a reference to the running process handler when
185 # the command is not executed as remote daemon in background
188 # timestamp of last state check of the application
189 self._last_state_check = tnow()
191 def log_message(self, msg):
192 return " guid %d - host %s - %s " % (self.guid,
193 self.node.get("hostname"), msg)
197 node = self.get_connected(LinuxNode.rtype())
198 if node: return node[0]
203 return os.path.join(self.node.exp_home, self._home)
207 return os.path.join(self.app_home, self.ec.run_id)
218 def in_foreground(self):
219 """ Returns True if the command needs to be executed in foreground.
220 This means that command will be executed using 'execute' instead of
221 'run' ('run' executes a command in background and detached from the
224 When using X11 forwarding option, the command can not run in background
225 and detached from a terminal, since we need to keep the terminal attached
228 return self.get("forwardX11") or self._in_foreground
230 def trace(self, name, attr = TraceAttr.ALL, block = 512, offset = 0):
231 self.info("Retrieving '%s' trace %s " % (name, attr))
233 path = os.path.join(self.run_home, name)
235 command = "(test -f %s && echo 'success') || echo 'error'" % path
236 (out, err), proc = self.node.execute(command)
238 if (err and proc.poll()) or out.find("error") != -1:
239 msg = " Couldn't find trace %s " % name
240 self.error(msg, out, err)
243 if attr == TraceAttr.PATH:
246 if attr == TraceAttr.ALL:
247 (out, err), proc = self.node.check_output(self.run_home, name)
250 msg = " Couldn't read trace %s " % name
251 self.error(msg, out, err)
256 if attr == TraceAttr.STREAM:
257 cmd = "dd if=%s bs=%d count=1 skip=%d" % (path, block, offset)
258 elif attr == TraceAttr.SIZE:
259 cmd = "stat -c%%s %s " % path
261 (out, err), proc = self.node.execute(cmd)
264 msg = " Couldn't find trace %s " % name
265 self.error(msg, out, err)
268 if attr == TraceAttr.SIZE:
269 out = int(out.strip())
275 # create run dir for application
276 self.node.mkdir(self.run_home)
278 # List of all the provision methods to invoke
285 self.upload_binaries,
287 self.upload_libraries,
292 # install dependencies
293 self.install_dependencies,
301 # Since provisioning takes a long time, before
302 # each step we check that the EC is still
305 self.debug("Interrupting provisioning. EC says 'ABORT")
312 # upload deploy script
313 deploy_command = ";".join(command)
314 self.execute_deploy_command(deploy_command)
316 # upload start script
317 self.upload_start_command()
319 self.info("Provisioning finished")
321 super(LinuxApplication, self).provision()
323 def upload_start_command(self):
324 # Upload command to remote bash script
325 # - only if command can be executed in background and detached
326 command = self.get("command")
328 if command and not self.in_foreground:
329 self.info("Uploading command '%s'" % command)
331 # replace application specific paths in the command
332 command = self.replace_paths(command)
334 # replace application specific paths in the environment
335 env = self.get("env")
336 env = env and self.replace_paths(env)
338 shfile = os.path.join(self.app_home, "start.sh")
340 self.node.upload_command(command,
345 def execute_deploy_command(self, command):
347 # Upload the command to a bash script and run it
348 # in background ( but wait until the command has
349 # finished to continue )
350 shfile = os.path.join(self.app_home, "deploy.sh")
351 self.node.run_and_wait(command, self.run_home,
354 pidfile = "deploy_pidfile",
355 ecodefile = "deploy_exitcode",
356 stdout = "deploy_stdout",
357 stderr = "deploy_stderr")
359 def upload_sources(self):
360 sources = self.get("sources")
365 self.info("Uploading sources ")
367 sources = sources.split(' ')
369 # Separate sources that should be downloaded from
370 # the web, from sources that should be uploaded from
373 for source in list(sources):
374 if source.startswith("http") or source.startswith("https"):
375 # remove the hhtp source from the sources list
376 sources.remove(source)
378 command.append( " ( "
379 # Check if the source already exists
380 " ls ${SRC}/%(basename)s "
382 # If source doesn't exist, download it and check
383 # that it it downloaded ok
384 " wget -c --directory-prefix=${SRC} %(source)s && "
385 " ls ${SRC}/%(basename)s "
387 "basename": os.path.basename(source),
391 command = " && ".join(command)
393 # replace application specific paths in the command
394 command = self.replace_paths(command)
397 sources = ' '.join(sources)
398 self.node.upload(sources, self.node.src_dir, overwrite = False)
402 def upload_files(self):
403 files = self.get("files")
406 self.info("Uploading files %s " % files)
407 self.node.upload(files, self.node.share_dir, overwrite = False)
409 def upload_libraries(self):
410 libs = self.get("libs")
413 self.info("Uploading libraries %s " % libaries)
414 self.node.upload(libs, self.node.lib_dir, overwrite = False)
416 def upload_binaries(self):
417 bins = self.get("bins")
420 self.info("Uploading binaries %s " % binaries)
421 self.node.upload(bins, self.node.bin_dir, overwrite = False)
423 def upload_code(self):
424 code = self.get("code")
427 self.info("Uploading code")
429 dst = os.path.join(self.app_home, "code")
430 self.node.upload(code, dst, overwrite = False, text = True)
432 def upload_stdin(self):
433 stdin = self.get("stdin")
435 # create dir for sources
436 self.info("Uploading stdin")
438 # upload stdin file to ${SHARE_DIR} directory
439 basename = os.path.basename(stdin)
440 dst = os.path.join(self.node.share_dir, basename)
441 self.node.upload(stdin, dst, overwrite = False, text = True)
443 # create "stdin" symlink on ${APP_HOME} directory
444 command = "( cd %(app_home)s ; [ ! -f stdin ] && ln -s %(stdin)s stdin )" % ({
445 "app_home": self.app_home,
450 def install_dependencies(self):
451 depends = self.get("depends")
453 self.info("Installing dependencies %s" % depends)
454 return self.node.install_packages_command(depends)
457 build = self.get("build")
460 self.info("Building sources ")
462 # replace application specific paths in the command
463 return self.replace_paths(build)
466 install = self.get("install")
469 self.info("Installing sources ")
471 # replace application specific paths in the command
472 return self.replace_paths(install)
476 # Wait until node is associated and deployed
478 if not node or node.state < ResourceState.READY:
479 self.debug("---- RESCHEDULING DEPLOY ---- node state %s " % self.node.state )
480 self.ec.schedule(reschedule_delay, self.deploy)
482 command = self.get("command") or ""
483 self.info("Deploying command '%s' " % command)
487 super(LinuxApplication, self).deploy()
491 command = self.get("command")
493 self.info("Starting command '%s'" % command)
496 # If no command was given (i.e. Application was used for dependency
497 # installation), then the application is directly marked as FINISHED
500 if self.in_foreground:
501 self._run_in_foreground()
503 self._run_in_background()
505 super(LinuxApplication, self).start()
507 def _run_in_foreground(self):
508 command = self.get("command")
509 sudo = self.get("sudo") or False
510 x11 = self.get("forwardX11")
511 env = self.get("env")
513 # For a command being executed in foreground, if there is stdin,
514 # it is expected to be text string not a file or pipe
515 stdin = self.get("stdin") or None
517 # Command will be launched in foreground and attached to the
518 # terminal using the node 'execute' in non blocking mode.
520 # We save the reference to the process in self._proc
521 # to be able to kill the process from the stop method.
522 # We also set blocking = False, since we don't want the
523 # thread to block until the execution finishes.
524 (out, err), self._proc = self.execute_command(command,
531 if self._proc.poll():
532 self.error(msg, out, err)
533 raise RuntimeError, msg
535 def _run_in_background(self):
536 command = self.get("command")
537 env = self.get("env")
538 sudo = self.get("sudo") or False
542 stdin = os.path.join(self.app_home, "stdin") if self.get("stdin") \
545 # Command will be run as a daemon in baground and detached from any
547 # The command to run was previously uploaded to a bash script
548 # during deployment, now we launch the remote script using 'run'
549 # method from the node.
550 cmd = "bash %s" % os.path.join(self.app_home, "start.sh")
551 (out, err), proc = self.node.run(cmd, self.run_home,
557 # check if execution errors occurred
558 msg = " Failed to start command '%s' " % command
561 self.error(msg, out, err)
562 raise RuntimeError, msg
564 # Wait for pid file to be generated
565 pid, ppid = self.node.wait_pid(self.run_home)
566 if pid: self._pid = int(pid)
567 if ppid: self._ppid = int(ppid)
569 # If the process is not running, check for error information
570 # on the remote machine
571 if not self.pid or not self.ppid:
572 (out, err), proc = self.node.check_errors(self.run_home,
575 # Out is what was written in the stderr file
577 msg = " Failed to start command '%s' " % command
578 self.error(msg, out, err)
579 raise RuntimeError, msg
583 """ Stops application execution
585 command = self.get('command') or ''
587 if self.state == ResourceState.STARTED:
589 self.info("Stopping command '%s' " % command)
591 # If the command is running in foreground (it was launched using
592 # the node 'execute' method), then we use the handler to the Popen
593 # process to kill it. Else we send a kill signal using the pid and ppid
594 # retrieved after running the command with the node 'run' method
598 # Only try to kill the process if the pid and ppid
600 if self.pid and self.ppid:
601 (out, err), proc = self.node.kill(self.pid, self.ppid,
602 sudo = self._sudo_kill)
604 # TODO: check if execution errors occurred
605 if proc.poll() or err:
606 msg = " Failed to STOP command '%s' " % self.get("command")
607 self.error(msg, out, err)
609 super(LinuxApplication, self).stop()
612 self.info("Releasing resource")
615 tear_down = self.get("tearDown")
617 self.node.execute(tear_down)
622 err = traceback.format_exc()
625 super(LinuxApplication, self).release()
629 """ Returns the state of the application
631 if self._state == ResourceState.STARTED:
632 if self.in_foreground:
633 # Check if the process we used to execute the command
634 # is still running ...
635 retcode = self._proc.poll()
637 # retcode == None -> running
638 # retcode > 0 -> error
639 # retcode == 0 -> finished
642 msg = " Failed to execute command '%s'" % self.get("command")
643 err = self._proc.stderr.read()
644 self.error(msg, out, err)
650 # We need to query the status of the command we launched in
651 # background. In order to avoid overwhelming the remote host and
652 # the local processor with too many ssh queries, the state is only
653 # requested every 'state_check_delay' seconds.
654 state_check_delay = 0.5
655 if tdiffsec(tnow(), self._last_state_check) > state_check_delay:
656 if self.pid and self.ppid:
657 # Make sure the process is still running in background
658 status = self.node.status(self.pid, self.ppid)
660 if status == ProcStatus.FINISHED:
661 # If the program finished, check if execution
663 (out, err), proc = self.node.check_errors(
667 msg = "Failed to execute command '%s'" % \
669 self.error(msg, out, err)
674 self._last_state_check = tnow()
678 def execute_command(self, command,
687 environ = self.node.format_environment(env, inline = True)
688 command = environ + command
689 command = self.replace_paths(command)
691 return self.node.execute(command,
694 forward_x11 = forward_x11,
697 def replace_paths(self, command):
699 Replace all special path tags with shell-escaped actual paths.
702 .replace("${USR}", self.node.usr_dir)
703 .replace("${LIB}", self.node.lib_dir)
704 .replace("${BIN}", self.node.bin_dir)
705 .replace("${SRC}", self.node.src_dir)
706 .replace("${SHARE}", self.node.share_dir)
707 .replace("${EXP}", self.node.exp_dir)
708 .replace("${EXP_HOME}", self.node.exp_home)
709 .replace("${APP_HOME}", self.app_home)
710 .replace("${RUN_HOME}", self.run_home)
711 .replace("${NODE_HOME}", self.node.node_home)
712 .replace("${HOME}", self.node.home_dir)
715 def valid_connection(self, guid):