X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=nepi%2Fresources%2Flinux%2Fapplication.py;fp=nepi%2Fresources%2Flinux%2Fapplication.py;h=9fd605d88d0848b21bee88b32a7873c772623926;hb=941fd7f54114b824fa26563d389a7ae07426fe14;hp=0000000000000000000000000000000000000000;hpb=7bdd35bc0d846e6ae89bdc8aaa2e919bbac25096;p=nepi.git
diff --git a/nepi/resources/linux/application.py b/nepi/resources/linux/application.py
new file mode 100644
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--- /dev/null
+++ b/nepi/resources/linux/application.py
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+#
+# NEPI, a framework to manage network experiments
+# Copyright (C) 2013 INRIA
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation;
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see .
+#
+# Author: Alina Quereilhac
+
+from nepi.execution.attribute import Attribute, Flags, Types
+from nepi.execution.trace import Trace, TraceAttr
+from nepi.execution.resource import ResourceManager, clsinit_copy, \
+ ResourceState
+from nepi.resources.linux.node import LinuxNode
+from nepi.util.sshfuncs import ProcStatus
+from nepi.util.timefuncs import tnow, tdiffsec
+
+import os
+import subprocess
+
+# TODO: Resolve wildcards in commands!!
+# TODO: When a failure occurs during deployment, scp and ssh processes are left running behind!!
+
+@clsinit_copy
+class LinuxApplication(ResourceManager):
+ """
+ .. class:: Class Args :
+
+ :param ec: The Experiment controller
+ :type ec: ExperimentController
+ :param guid: guid of the RM
+ :type guid: int
+
+ .. note::
+
+ A LinuxApplication RM represents a process that can be executed in
+ a remote Linux host using SSH.
+
+ The LinuxApplication RM takes care of uploadin sources and any files
+ needed to run the experiment, to the remote host.
+ It also allows to provide source compilation (build) and installation
+ instructions, and takes care of automating the sources build and
+ installation tasks for the user.
+
+ It is important to note that files uploaded to the remote host have
+ two possible scopes: single-experiment or multi-experiment.
+ Single experiment files are those that will not be re-used by other
+ experiments. Multi-experiment files are those that will.
+ Sources and shared files are always made available to all experiments.
+
+ Directory structure:
+
+ The directory structure used by LinuxApplication RM at the Linux
+ host is the following:
+
+ ${HOME}/.nepi/nepi-usr --> Base directory for multi-experiment files
+ |
+ ${LIB} |- /lib --> Base directory for libraries
+ ${BIN} |- /bin --> Base directory for binary files
+ ${SRC} |- /src --> Base directory for sources
+ ${SHARE} |- /share --> Base directory for other files
+
+ ${HOME}/.nepi/nepi-exp --> Base directory for single-experiment files
+ |
+ ${EXP_HOME} |- / --> Base directory for experiment exp-id
+ |
+ ${APP_HOME} |- / --> Base directory for application
+ | specific files (e.g. command.sh, input)
+ |
+ ${RUN_HOME} |- / --> Base directory for run specific
+
+ """
+
+ _rtype = "linux::Application"
+ _help = "Runs an application on a Linux host with a BASH command "
+ _platform = "linux"
+
+ @classmethod
+ def _register_attributes(cls):
+ command = Attribute("command", "Command to execute at application start. "
+ "Note that commands will be executed in the ${RUN_HOME} directory, "
+ "make sure to take this into account when using relative paths. ",
+ flags = Flags.Design)
+ forward_x11 = Attribute("forwardX11", "Enables X11 forwarding for SSH connections",
+ flags = Flags.Design)
+ env = Attribute("env", "Environment variables string for command execution",
+ flags = Flags.Design)
+ sudo = Attribute("sudo", "Run with root privileges",
+ flags = Flags.Design)
+ depends = Attribute("depends",
+ "Space-separated list of packages required to run the application",
+ flags = Flags.Design)
+ sources = Attribute("sources",
+ "semi-colon separated list of regular files to be uploaded to ${SRC} "
+ "directory prior to building. Archives won't be expanded automatically. "
+ "Sources are globally available for all experiments unless "
+ "cleanHome is set to True (This will delete all sources). ",
+ flags = Flags.Design)
+ files = Attribute("files",
+ "semi-colon separated list of regular miscellaneous files to be uploaded "
+ "to ${SHARE} directory. "
+ "Files are globally available for all experiments unless "
+ "cleanHome is set to True (This will delete all files). ",
+ flags = Flags.Design)
+ libs = Attribute("libs",
+ "semi-colon separated list of libraries (e.g. .so files) to be uploaded "
+ "to ${LIB} directory. "
+ "Libraries are globally available for all experiments unless "
+ "cleanHome is set to True (This will delete all files). ",
+ flags = Flags.Design)
+ bins = Attribute("bins",
+ "semi-colon separated list of binary files to be uploaded "
+ "to ${BIN} directory. "
+ "Binaries are globally available for all experiments unless "
+ "cleanHome is set to True (This will delete all files). ",
+ flags = Flags.Design)
+ code = Attribute("code",
+ "Plain text source code to be uploaded to the ${APP_HOME} directory. ",
+ flags = Flags.Design)
+ build = Attribute("build",
+ "Build commands to execute after deploying the sources. "
+ "Sources are uploaded to the ${SRC} directory and code "
+ "is uploaded to the ${APP_HOME} directory. \n"
+ "Usage example: tar xzf ${SRC}/my-app.tgz && cd my-app && "
+ "./configure && make && make clean.\n"
+ "Make sure to make the build commands return with a nonzero exit "
+ "code on error.",
+ flags = Flags.Design)
+ install = Attribute("install",
+ "Commands to transfer built files to their final destinations. "
+ "Install commands are executed after build commands. ",
+ flags = Flags.Design)
+ stdin = Attribute("stdin", "Standard input for the 'command'",
+ flags = Flags.Design)
+ tear_down = Attribute("tearDown", "Command to be executed just before "
+ "releasing the resource",
+ flags = Flags.Design)
+
+ cls._register_attribute(command)
+ cls._register_attribute(forward_x11)
+ cls._register_attribute(env)
+ cls._register_attribute(sudo)
+ cls._register_attribute(depends)
+ cls._register_attribute(sources)
+ cls._register_attribute(code)
+ cls._register_attribute(files)
+ cls._register_attribute(bins)
+ cls._register_attribute(libs)
+ cls._register_attribute(build)
+ cls._register_attribute(install)
+ cls._register_attribute(stdin)
+ cls._register_attribute(tear_down)
+
+ @classmethod
+ def _register_traces(cls):
+ stdout = Trace("stdout", "Standard output stream", enabled = True)
+ stderr = Trace("stderr", "Standard error stream", enabled = True)
+
+ cls._register_trace(stdout)
+ cls._register_trace(stderr)
+
+ def __init__(self, ec, guid):
+ super(LinuxApplication, self).__init__(ec, guid)
+ self._pid = None
+ self._ppid = None
+ self._node = None
+ self._home = "app-%s" % self.guid
+
+ # whether the command should run in foreground attached
+ # to a terminal
+ self._in_foreground = False
+
+ # whether to use sudo to kill the application process
+ self._sudo_kill = False
+
+ # keep a reference to the running process handler when
+ # the command is not executed as remote daemon in background
+ self._proc = None
+
+ # timestamp of last state check of the application
+ self._last_state_check = tnow()
+
+ def log_message(self, msg):
+ return " guid %d - host %s - %s " % (self.guid,
+ self.node.get("hostname"), msg)
+
+ @property
+ def node(self):
+ if not self._node:
+ node = self.get_connected(LinuxNode.get_rtype())
+ if not node:
+ msg = "Application %s guid %d NOT connected to Node" % (
+ self._rtype, self.guid)
+ raise RuntimeError(msg)
+
+ self._node = node[0]
+
+ return self._node
+
+ @property
+ def app_home(self):
+ return os.path.join(self.node.exp_home, self._home)
+
+ @property
+ def run_home(self):
+ return os.path.join(self.app_home, self.ec.run_id)
+
+ @property
+ def pid(self):
+ return self._pid
+
+ @property
+ def ppid(self):
+ return self._ppid
+
+ @property
+ def in_foreground(self):
+ """ Returns True if the command needs to be executed in foreground.
+ This means that command will be executed using 'execute' instead of
+ 'run' ('run' executes a command in background and detached from the
+ terminal)
+
+ When using X11 forwarding option, the command can not run in background
+ and detached from a terminal, since we need to keep the terminal attached
+ to interact with it.
+ """
+ return self.get("forwardX11") or self._in_foreground
+
+ def trace_filepath(self, filename):
+ return os.path.join(self.run_home, filename)
+
+ def trace(self, name, attr = TraceAttr.ALL, block = 512, offset = 0):
+ self.info("Retrieving '%s' trace %s " % (name, attr))
+
+ path = self.trace_filepath(name)
+
+ command = "(test -f %s && echo 'success') || echo 'error'" % path
+ (out, err), proc = self.node.execute(command)
+
+ if (err and proc.poll()) or out.find("error") != -1:
+ msg = " Couldn't find trace %s " % name
+ self.error(msg, out, err)
+ return None
+
+ if attr == TraceAttr.PATH:
+ return path
+
+ if attr == TraceAttr.ALL:
+ (out, err), proc = self.node.check_output(self.run_home, name)
+
+ if proc.poll():
+ msg = " Couldn't read trace %s " % name
+ self.error(msg, out, err)
+ return None
+
+ return out
+
+ if attr == TraceAttr.STREAM:
+ cmd = "dd if=%s bs=%d count=1 skip=%d" % (path, block, offset)
+ elif attr == TraceAttr.SIZE:
+ cmd = "stat -c%%s %s " % path
+
+ (out, err), proc = self.node.execute(cmd)
+
+ if proc.poll():
+ msg = " Couldn't find trace %s " % name
+ self.error(msg, out, err)
+ return None
+
+ if attr == TraceAttr.SIZE:
+ out = int(out.strip())
+
+ return out
+
+ def do_provision(self):
+ # take a snapshot of the system if user is root
+ # to ensure that cleanProcess will not kill
+ # pre-existent processes
+ if self.node.get("username") == 'root':
+ import pickle
+ procs = dict()
+ ps_aux = "ps aux |awk '{print $2,$11}'"
+ (out, err), proc = self.node.execute(ps_aux)
+ if len(out) != 0:
+ for line in out.strip().split("\n"):
+ parts = line.strip().split(" ")
+ procs[parts[0]] = parts[1]
+ with open("/tmp/save.proc", "wb") as pickle_file:
+ pickle.dump(procs, pickle_file)
+
+ # create run dir for application
+ self.node.mkdir(self.run_home)
+
+ # List of all the provision methods to invoke
+ steps = [
+ # upload sources
+ self.upload_sources,
+ # upload files
+ self.upload_files,
+ # upload binaries
+ self.upload_binaries,
+ # upload libraries
+ self.upload_libraries,
+ # upload code
+ self.upload_code,
+ # upload stdin
+ self.upload_stdin,
+ # install dependencies
+ self.install_dependencies,
+ # build
+ self.build,
+ # Install
+ self.install]
+
+ command = []
+
+ # Since provisioning takes a long time, before
+ # each step we check that the EC is still
+ for step in steps:
+ if self.ec.abort:
+ self.debug("Interrupting provisioning. EC says 'ABORT")
+ return
+
+ ret = step()
+ if ret:
+ command.append(ret)
+
+ # upload deploy script
+ deploy_command = ";".join(command)
+ self.execute_deploy_command(deploy_command)
+
+ # upload start script
+ self.upload_start_command()
+
+ self.info("Provisioning finished")
+
+ super(LinuxApplication, self).do_provision()
+
+ def upload_start_command(self, overwrite = False):
+ # Upload command to remote bash script
+ # - only if command can be executed in background and detached
+ command = self.get("command")
+
+ if command and not self.in_foreground:
+ self.info("Uploading command '%s'" % command)
+
+ # replace application specific paths in the command
+ command = self.replace_paths(command)
+ # replace application specific paths in the environment
+ env = self.get("env")
+ env = env and self.replace_paths(env)
+
+ shfile = os.path.join(self.app_home, "start.sh")
+
+ self.node.upload_command(command,
+ shfile = shfile,
+ env = env,
+ overwrite = overwrite)
+
+ def execute_deploy_command(self, command, prefix="deploy"):
+ if command:
+ # replace application specific paths in the command
+ command = self.replace_paths(command)
+
+ # replace application specific paths in the environment
+ env = self.get("env")
+ env = env and self.replace_paths(env)
+
+ # Upload the command to a bash script and run it
+ # in background ( but wait until the command has
+ # finished to continue )
+ shfile = os.path.join(self.app_home, "%s.sh" % prefix)
+ self.node.run_and_wait(command, self.run_home,
+ shfile = shfile,
+ overwrite = False,
+ pidfile = "%s_pidfile" % prefix,
+ ecodefile = "%s_exitcode" % prefix,
+ stdout = "%s_stdout" % prefix,
+ stderr = "%s_stderr" % prefix)
+
+ def upload_sources(self, sources = None, src_dir = None):
+ if not sources:
+ sources = self.get("sources")
+
+ command = ""
+
+ if not src_dir:
+ src_dir = self.node.src_dir
+
+ if sources:
+ self.info("Uploading sources ")
+
+ sources = [str.strip(source) for source in sources.split(";")]
+
+ # Separate sources that should be downloaded from
+ # the web, from sources that should be uploaded from
+ # the local machine
+ command = []
+ for source in list(sources):
+ if source.startswith("http") or source.startswith("https"):
+ # remove the hhtp source from the sources list
+ sources.remove(source)
+
+ command.append( " ( "
+ # Check if the source already exists
+ " ls %(src_dir)s/%(basename)s "
+ " || ( "
+ # If source doesn't exist, download it and check
+ # that it it downloaded ok
+ " wget -c --directory-prefix=%(src_dir)s %(source)s && "
+ " ls %(src_dir)s/%(basename)s "
+ " ) ) " % {
+ "basename": os.path.basename(source),
+ "source": source,
+ "src_dir": src_dir
+ })
+
+ command = " && ".join(command)
+
+ # replace application specific paths in the command
+ command = self.replace_paths(command)
+
+ if sources:
+ sources = ';'.join(sources)
+ self.node.upload(sources, src_dir, overwrite = False)
+
+ return command
+
+ def upload_files(self, files = None):
+ if not files:
+ files = self.get("files")
+
+ if files:
+ self.info("Uploading files %s " % files)
+ self.node.upload(files, self.node.share_dir, overwrite = False)
+
+ def upload_libraries(self, libs = None):
+ if not libs:
+ libs = self.get("libs")
+
+ if libs:
+ self.info("Uploading libraries %s " % libaries)
+ self.node.upload(libs, self.node.lib_dir, overwrite = False)
+
+ def upload_binaries(self, bins = None):
+ if not bins:
+ bins = self.get("bins")
+
+ if bins:
+ self.info("Uploading binaries %s " % binaries)
+ self.node.upload(bins, self.node.bin_dir, overwrite = False)
+
+ def upload_code(self, code = None):
+ if not code:
+ code = self.get("code")
+
+ if code:
+ self.info("Uploading code")
+
+ dst = os.path.join(self.app_home, "code")
+ self.node.upload(code, dst, overwrite = False, text = True)
+
+ def upload_stdin(self, stdin = None):
+ if not stdin:
+ stdin = self.get("stdin")
+
+ if stdin:
+ # create dir for sources
+ self.info("Uploading stdin")
+
+ # upload stdin file to ${SHARE_DIR} directory
+ if os.path.isfile(stdin):
+ basename = os.path.basename(stdin)
+ dst = os.path.join(self.node.share_dir, basename)
+ else:
+ dst = os.path.join(self.app_home, "stdin")
+
+ self.node.upload(stdin, dst, overwrite = False, text = True)
+
+ # create "stdin" symlink on ${APP_HOME} directory
+ command = "( cd %(app_home)s ; [ ! -f stdin ] && ln -s %(stdin)s stdin )" % ({
+ "app_home": self.app_home,
+ "stdin": dst })
+
+ return command
+
+ def install_dependencies(self, depends = None):
+ if not depends:
+ depends = self.get("depends")
+
+ if depends:
+ self.info("Installing dependencies %s" % depends)
+ return self.node.install_packages_command(depends)
+
+ def build(self, build = None):
+ if not build:
+ build = self.get("build")
+
+ if build:
+ self.info("Building sources ")
+
+ # replace application specific paths in the command
+ return self.replace_paths(build)
+
+ def install(self, install = None):
+ if not install:
+ install = self.get("install")
+
+ if install:
+ self.info("Installing sources ")
+
+ # replace application specific paths in the command
+ return self.replace_paths(install)
+
+ def do_deploy(self):
+ # Wait until node is associated and deployed
+ node = self.node
+ if not node or node.state < ResourceState.READY:
+ self.debug("---- RESCHEDULING DEPLOY ---- node state %s " % self.node.state)
+ self.ec.schedule(self.reschedule_delay, self.deploy)
+ else:
+ command = self.get("command") or ""
+ self.info("Deploying command '%s' " % command)
+ self.do_discover()
+ self.do_provision()
+
+ super(LinuxApplication, self).do_deploy()
+
+ def do_start(self):
+ command = self.get("command")
+
+ self.info("Starting command '%s'" % command)
+
+ if not command:
+ # If no command was given (i.e. Application was used for dependency
+ # installation), then the application is directly marked as STOPPED
+ super(LinuxApplication, self).set_stopped()
+ else:
+ if self.in_foreground:
+ self._run_in_foreground()
+ else:
+ self._run_in_background()
+
+ super(LinuxApplication, self).do_start()
+
+ def _run_in_foreground(self):
+ command = self.get("command")
+ sudo = self.get("sudo") or False
+ x11 = self.get("forwardX11")
+ env = self.get("env")
+
+ # Command will be launched in foreground and attached to the
+ # terminal using the node 'execute' in non blocking mode.
+
+ # We save the reference to the process in self._proc
+ # to be able to kill the process from the stop method.
+ # We also set blocking = False, since we don't want the
+ # thread to block until the execution finishes.
+ (out, err), self._proc = self.execute_command(command,
+ env = env,
+ sudo = sudo,
+ forward_x11 = x11,
+ blocking = False)
+
+ if self._proc.poll():
+ self.error(msg, out, err)
+ raise RuntimeError(msg)
+
+ def _run_in_background(self):
+ command = self.get("command")
+ env = self.get("env")
+ sudo = self.get("sudo") or False
+
+ stdout = "stdout"
+ stderr = "stderr"
+ stdin = os.path.join(self.app_home, "stdin") if self.get("stdin") \
+ else None
+
+ # Command will be run as a daemon in baground and detached from any
+ # terminal.
+ # The command to run was previously uploaded to a bash script
+ # during deployment, now we launch the remote script using 'run'
+ # method from the node.
+ cmd = "bash %s" % os.path.join(self.app_home, "start.sh")
+ (out, err), proc = self.node.run(cmd, self.run_home,
+ stdin = stdin,
+ stdout = stdout,
+ stderr = stderr,
+ sudo = sudo)
+
+ # check if execution errors occurred
+ msg = " Failed to start command '%s' " % command
+
+ if proc.poll():
+ self.error(msg, out, err)
+ raise RuntimeError(msg)
+
+ # Wait for pid file to be generated
+ pid, ppid = self.node.wait_pid(self.run_home)
+ if pid: self._pid = int(pid)
+ if ppid: self._ppid = int(ppid)
+
+ # If the process is not running, check for error information
+ # on the remote machine
+ if not self.pid or not self.ppid:
+ (out, err), proc = self.node.check_errors(self.run_home,
+ stderr = stderr)
+
+ # Out is what was written in the stderr file
+ if err:
+ msg = " Failed to start command '%s' " % command
+ self.error(msg, out, err)
+ raise RuntimeError(msg)
+
+ def do_stop(self):
+ """ Stops application execution
+ """
+ command = self.get('command') or ''
+
+ if self.state == ResourceState.STARTED:
+
+ self.info("Stopping command '%s' " % command)
+
+ # If the command is running in foreground (it was launched using
+ # the node 'execute' method), then we use the handler to the Popen
+ # process to kill it. Else we send a kill signal using the pid and ppid
+ # retrieved after running the command with the node 'run' method
+ if self._proc:
+ self._proc.kill()
+ else:
+ # Only try to kill the process if the pid and ppid
+ # were retrieved
+ if self.pid and self.ppid:
+ (out, err), proc = self.node.kill(self.pid, self.ppid,
+ sudo = self._sudo_kill)
+
+ """
+ # TODO: check if execution errors occurred
+ if (proc and proc.poll()) or err:
+ msg = " Failed to STOP command '%s' " % self.get("command")
+ self.error(msg, out, err)
+ """
+
+ super(LinuxApplication, self).do_stop()
+
+ def do_release(self):
+ self.info("Releasing resource")
+
+ self.do_stop()
+
+ tear_down = self.get("tearDown")
+ if tear_down:
+ self.node.execute(tear_down)
+
+ hard_release = self.get("hardRelease")
+ if hard_release:
+ self.node.rmdir(self.app_home)
+
+ super(LinuxApplication, self).do_release()
+
+ @property
+ def state(self):
+ """ Returns the state of the application
+ """
+ if self._state == ResourceState.STARTED:
+ if self.in_foreground:
+ # Check if the process we used to execute the command
+ # is still running ...
+ retcode = self._proc.poll()
+
+ # retcode == None -> running
+ # retcode > 0 -> error
+ # retcode == 0 -> finished
+ if retcode:
+ out = ""
+ msg = " Failed to execute command '%s'" % self.get("command")
+ err = self._proc.stderr.read()
+ self.error(msg, out, err)
+ self.do_fail()
+
+ elif retcode == 0:
+ self.set_stopped()
+ else:
+ # We need to query the status of the command we launched in
+ # background. In order to avoid overwhelming the remote host and
+ # the local processor with too many ssh queries, the state is only
+ # requested every 'state_check_delay' seconds.
+ state_check_delay = 0.5
+ if tdiffsec(tnow(), self._last_state_check) > state_check_delay:
+ if self.pid and self.ppid:
+ # Make sure the process is still running in background
+ status = self.node.status(self.pid, self.ppid)
+
+ if status == ProcStatus.FINISHED:
+ # If the program finished, check if execution
+ # errors occurred
+ (out, err), proc = self.node.check_errors(
+ self.run_home)
+
+ if err:
+ msg = "Failed to execute command '%s'" % \
+ self.get("command")
+ self.error(msg, out, err)
+ self.do_fail()
+ else:
+ self.set_stopped()
+
+ self._last_state_check = tnow()
+
+ return self._state
+
+ def execute_command(self, command,
+ env=None,
+ sudo=False,
+ tty=False,
+ forward_x11=False,
+ blocking=False):
+
+ environ = ""
+ if env:
+ environ = self.node.format_environment(env, inline=True)
+ command = environ + command
+ command = self.replace_paths(command)
+
+ return self.node.execute(command,
+ sudo=sudo,
+ tty=tty,
+ forward_x11=forward_x11,
+ blocking=blocking)
+
+ def replace_paths(self, command, node=None, app_home=None, run_home=None):
+ """
+ Replace all special path tags with shell-escaped actual paths.
+ """
+ if not node:
+ node=self.node
+
+ if not app_home:
+ app_home=self.app_home
+
+ if not run_home:
+ run_home = self.run_home
+
+ return ( command
+ .replace("${USR}", node.usr_dir)
+ .replace("${LIB}", node.lib_dir)
+ .replace("${BIN}", node.bin_dir)
+ .replace("${SRC}", node.src_dir)
+ .replace("${SHARE}", node.share_dir)
+ .replace("${EXP}", node.exp_dir)
+ .replace("${EXP_HOME}", node.exp_home)
+ .replace("${APP_HOME}", app_home)
+ .replace("${RUN_HOME}", run_home)
+ .replace("${NODE_HOME}", node.node_home)
+ .replace("${HOME}", node.home_dir)
+ )
+
+ def valid_connection(self, guid):
+ # TODO: Validate!
+ return True
+