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
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. ",
94 forward_x11 = Attribute("forwardX11", "Enables X11 forwarding for SSH connections",
96 env = Attribute("env", "Environment variables string for command execution",
98 sudo = Attribute("sudo", "Run with root privileges",
100 depends = Attribute("depends",
101 "Space-separated list of packages required to run the application",
102 flags = Flags.Design)
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.Design)
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.Design)
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.Design)
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.Design)
127 code = Attribute("code",
128 "Plain text source code to be uploaded to the ${APP_HOME} directory. ",
129 flags = Flags.Design)
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.Design)
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.Design)
143 stdin = Attribute("stdin", "Standard input for the 'command'",
144 flags = Flags.Design)
145 tear_down = Attribute("tearDown", "Command to be executed just before "
146 "releasing the resource",
147 flags = Flags.Design)
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", enabled = True)
167 stderr = Trace("stderr", "Standard error stream", enabled = True)
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.get_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_filepath(self, filename):
231 return os.path.join(self.run_home, filename)
233 def trace(self, name, attr = TraceAttr.ALL, block = 512, offset = 0):
234 self.info("Retrieving '%s' trace %s " % (name, attr))
236 path = self.trace_filepath(name)
238 command = "(test -f %s && echo 'success') || echo 'error'" % path
239 (out, err), proc = self.node.execute(command)
241 if (err and proc.poll()) or out.find("error") != -1:
242 msg = " Couldn't find trace %s " % name
243 self.error(msg, out, err)
246 if attr == TraceAttr.PATH:
249 if attr == TraceAttr.ALL:
250 (out, err), proc = self.node.check_output(self.run_home, name)
253 msg = " Couldn't read trace %s " % name
254 self.error(msg, out, err)
259 if attr == TraceAttr.STREAM:
260 cmd = "dd if=%s bs=%d count=1 skip=%d" % (path, block, offset)
261 elif attr == TraceAttr.SIZE:
262 cmd = "stat -c%%s %s " % path
264 (out, err), proc = self.node.execute(cmd)
267 msg = " Couldn't find trace %s " % name
268 self.error(msg, out, err)
271 if attr == TraceAttr.SIZE:
272 out = int(out.strip())
276 def do_provision(self):
277 # create run dir for application
278 self.node.mkdir(self.run_home)
280 # List of all the provision methods to invoke
287 self.upload_binaries,
289 self.upload_libraries,
294 # install dependencies
295 self.install_dependencies,
303 # Since provisioning takes a long time, before
304 # each step we check that the EC is still
307 self.debug("Interrupting provisioning. EC says 'ABORT")
314 # upload deploy script
315 deploy_command = ";".join(command)
316 self.execute_deploy_command(deploy_command)
318 # upload start script
319 self.upload_start_command()
321 self.info("Provisioning finished")
323 super(LinuxApplication, self).do_provision()
325 def upload_start_command(self, overwrite = False):
326 # Upload command to remote bash script
327 # - only if command can be executed in background and detached
328 command = self.get("command")
330 if command and not self.in_foreground:
331 self.info("Uploading command '%s'" % command)
333 # replace application specific paths in the command
334 command = self.replace_paths(command)
336 # replace application specific paths in the environment
337 env = self.get("env")
338 env = env and self.replace_paths(env)
340 shfile = os.path.join(self.app_home, "start.sh")
342 self.node.upload_command(command,
345 overwrite = overwrite)
347 def execute_deploy_command(self, command):
349 # Upload the command to a bash script and run it
350 # in background ( but wait until the command has
351 # finished to continue )
352 shfile = os.path.join(self.app_home, "deploy.sh")
353 self.node.run_and_wait(command, self.run_home,
356 pidfile = "deploy_pidfile",
357 ecodefile = "deploy_exitcode",
358 stdout = "deploy_stdout",
359 stderr = "deploy_stderr")
361 def upload_sources(self):
362 sources = self.get("sources")
367 self.info("Uploading sources ")
369 sources = sources.split(' ')
371 # Separate sources that should be downloaded from
372 # the web, from sources that should be uploaded from
375 for source in list(sources):
376 if source.startswith("http") or source.startswith("https"):
377 # remove the hhtp source from the sources list
378 sources.remove(source)
380 command.append( " ( "
381 # Check if the source already exists
382 " ls ${SRC}/%(basename)s "
384 # If source doesn't exist, download it and check
385 # that it it downloaded ok
386 " wget -c --directory-prefix=${SRC} %(source)s && "
387 " ls ${SRC}/%(basename)s "
389 "basename": os.path.basename(source),
393 command = " && ".join(command)
395 # replace application specific paths in the command
396 command = self.replace_paths(command)
399 sources = ' '.join(sources)
400 self.node.upload(sources, self.node.src_dir, overwrite = False)
404 def upload_files(self):
405 files = self.get("files")
408 self.info("Uploading files %s " % files)
409 self.node.upload(files, self.node.share_dir, overwrite = False)
411 def upload_libraries(self):
412 libs = self.get("libs")
415 self.info("Uploading libraries %s " % libaries)
416 self.node.upload(libs, self.node.lib_dir, overwrite = False)
418 def upload_binaries(self):
419 bins = self.get("bins")
422 self.info("Uploading binaries %s " % binaries)
423 self.node.upload(bins, self.node.bin_dir, overwrite = False)
425 def upload_code(self):
426 code = self.get("code")
429 self.info("Uploading code")
431 dst = os.path.join(self.app_home, "code")
432 self.node.upload(code, dst, overwrite = False, text = True)
434 def upload_stdin(self):
435 stdin = self.get("stdin")
437 # create dir for sources
438 self.info("Uploading stdin")
440 # upload stdin file to ${SHARE_DIR} directory
441 basename = os.path.basename(stdin)
442 dst = os.path.join(self.node.share_dir, basename)
443 self.node.upload(stdin, dst, overwrite = False, text = True)
445 # create "stdin" symlink on ${APP_HOME} directory
446 command = "( cd %(app_home)s ; [ ! -f stdin ] && ln -s %(stdin)s stdin )" % ({
447 "app_home": self.app_home,
452 def install_dependencies(self):
453 depends = self.get("depends")
455 self.info("Installing dependencies %s" % depends)
456 return self.node.install_packages_command(depends)
459 build = self.get("build")
462 self.info("Building sources ")
464 # replace application specific paths in the command
465 return self.replace_paths(build)
468 install = self.get("install")
471 self.info("Installing sources ")
473 # replace application specific paths in the command
474 return self.replace_paths(install)
477 # Wait until node is associated and deployed
479 if not node or node.state < ResourceState.READY:
480 self.debug("---- RESCHEDULING DEPLOY ---- node state %s " % self.node.state )
481 self.ec.schedule(reschedule_delay, self.deploy)
483 command = self.get("command") or ""
484 self.info("Deploying command '%s' " % command)
488 super(LinuxApplication, self).do_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 STOPPED
498 super(LinuxApplication, self).set_stopped()
500 if self.in_foreground:
501 self._run_in_foreground()
503 self._run_in_background()
505 super(LinuxApplication, self).do_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 # Command will be launched in foreground and attached to the
514 # terminal using the node 'execute' in non blocking mode.
516 # We save the reference to the process in self._proc
517 # to be able to kill the process from the stop method.
518 # We also set blocking = False, since we don't want the
519 # thread to block until the execution finishes.
520 (out, err), self._proc = self.execute_command(command,
526 if self._proc.poll():
527 self.error(msg, out, err)
528 raise RuntimeError, msg
530 def _run_in_background(self):
531 command = self.get("command")
532 env = self.get("env")
533 sudo = self.get("sudo") or False
537 stdin = os.path.join(self.app_home, "stdin") if self.get("stdin") \
540 # Command will be run as a daemon in baground and detached from any
542 # The command to run was previously uploaded to a bash script
543 # during deployment, now we launch the remote script using 'run'
544 # method from the node.
545 cmd = "bash %s" % os.path.join(self.app_home, "start.sh")
546 (out, err), proc = self.node.run(cmd, self.run_home,
552 # check if execution errors occurred
553 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
572 msg = " Failed to start command '%s' " % command
573 self.error(msg, out, err)
574 raise RuntimeError, msg
577 """ Stops application execution
579 command = self.get('command') or ''
581 if self.state == ResourceState.STARTED:
583 self.info("Stopping command '%s' " % command)
585 # If the command is running in foreground (it was launched using
586 # the node 'execute' method), then we use the handler to the Popen
587 # process to kill it. Else we send a kill signal using the pid and ppid
588 # retrieved after running the command with the node 'run' method
592 # Only try to kill the process if the pid and ppid
594 if self.pid and self.ppid:
595 (out, err), proc = self.node.kill(self.pid, self.ppid,
596 sudo = self._sudo_kill)
598 # TODO: check if execution errors occurred
599 if (proc and proc.poll()) or err:
600 msg = " Failed to STOP command '%s' " % self.get("command")
601 self.error(msg, out, err)
603 super(LinuxApplication, self).do_stop()
605 def do_release(self):
606 self.info("Releasing resource")
608 tear_down = self.get("tearDown")
610 self.node.execute(tear_down)
614 super(LinuxApplication, self).do_release()
618 """ Returns the state of the application
620 if self._state == ResourceState.STARTED:
621 if self.in_foreground:
622 # Check if the process we used to execute the command
623 # is still running ...
624 retcode = self._proc.poll()
626 # retcode == None -> running
627 # retcode > 0 -> error
628 # retcode == 0 -> finished
631 msg = " Failed to execute command '%s'" % self.get("command")
632 err = self._proc.stderr.read()
633 self.error(msg, out, err)
639 # We need to query the status of the command we launched in
640 # background. In order to avoid overwhelming the remote host and
641 # the local processor with too many ssh queries, the state is only
642 # requested every 'state_check_delay' seconds.
643 state_check_delay = 0.5
644 if tdiffsec(tnow(), self._last_state_check) > state_check_delay:
645 if self.pid and self.ppid:
646 # Make sure the process is still running in background
647 status = self.node.status(self.pid, self.ppid)
649 if status == ProcStatus.FINISHED:
650 # If the program finished, check if execution
652 (out, err), proc = self.node.check_errors(
656 msg = "Failed to execute command '%s'" % \
658 self.error(msg, out, err)
663 self._last_state_check = tnow()
667 def execute_command(self, command,
675 environ = self.node.format_environment(env, inline = True)
676 command = environ + command
677 command = self.replace_paths(command)
679 return self.node.execute(command,
681 forward_x11 = forward_x11,
684 def replace_paths(self, command):
686 Replace all special path tags with shell-escaped actual paths.
689 .replace("${USR}", self.node.usr_dir)
690 .replace("${LIB}", self.node.lib_dir)
691 .replace("${BIN}", self.node.bin_dir)
692 .replace("${SRC}", self.node.src_dir)
693 .replace("${SHARE}", self.node.share_dir)
694 .replace("${EXP}", self.node.exp_dir)
695 .replace("${EXP_HOME}", self.node.exp_home)
696 .replace("${APP_HOME}", self.app_home)
697 .replace("${RUN_HOME}", self.run_home)
698 .replace("${NODE_HOME}", self.node.node_home)
699 .replace("${HOME}", self.node.home_dir)
702 def valid_connection(self, guid):