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# A Job consists of many "Tasks".
# A task is the run of an external tool, with proper methods for failure handling
from Tools.CList import CList
class Job:
NOT_STARTED, IN_PROGRESS, FINISHED, FAILED = range(4)
def __init__(self, name):
self.tasks = [ ]
self.workspace = "/tmp"
self.current_task = 0
self.callback = None
self.name = name
self.finished = False
self.state_changed = CList()
self.status = self.NOT_STARTED
# description is a dict
def fromDescription(self, description):
pass
def createDescription(self):
return None
def addTask(self, task):
task.job = self
self.tasks.append(task)
def start(self, callback):
assert self.callback is None
self.callback = callback
self.status = self.IN_PROGRESS
self.state_changed()
self.runNext()
def runNext(self):
if self.current_task == len(self.tasks):
self.callback(self, [])
self.status = self.FINISHED
self.state_changed()
else:
self.tasks[self.current_task].run(self.taskCallback)
self.state_changed()
def taskCallback(self, res):
if len(res):
print ">>> Error:", res
self.status = self.FAILED
self.state_changed()
self.callback(self, res)
else:
self.current_task += 1
self.runNext()
class Task:
def __init__(self, job, name):
self.name = name
self.immediate_preconditions = [ ]
self.global_preconditions = [ ]
self.postconditions = [ ]
self.returncode = None
self.initial_input = None
self.job = None
self.cmd = None
self.args = [ ]
job.addTask(self)
def setCommandline(self, cmd, args):
self.cmd = cmd
self.args = args
def setTool(self, tool):
self.cmd = tool
self.args = [tool]
self.global_preconditions.append(ToolExistsPrecondition())
self.postconditions.append(ReturncodePostcondition())
def checkPreconditions(self, immediate = False):
not_met = [ ]
if immediate:
preconditions = self.immediate_preconditions
else:
preconditions = self.global_preconditions
for precondition in preconditions:
if not precondition.check(self):
not_met.append(precondition)
return not_met
def run(self, callback):
failed_preconditions = self.checkPreconditions(True) + self.checkPreconditions(False)
if len(failed_preconditions):
callback(failed_preconditions)
return
self.prepare()
self.callback = callback
from enigma import eConsoleAppContainer
self.container = eConsoleAppContainer()
self.container.appClosed.get().append(self.processFinished)
self.container.dataAvail.get().append(self.processOutput)
assert self.cmd is not None
assert len(self.args) >= 1
print "execute:", self.container.execute(self.cmd, self.args), self.cmd, self.args
if self.initial_input:
self.writeInput(self.initial_input)
def prepare(self):
pass
def cleanup(self, failed):
pass
def processOutput(self, data):
pass
def processFinished(self, returncode):
self.returncode = returncode
self.finish()
def finish(self):
self.afterRun()
not_met = [ ]
for postcondition in self.postconditions:
if not postcondition.check(self):
not_met.append(postcondition)
self.callback(not_met)
def afterRun(self):
pass
def writeInput(self, input):
self.container.write(input)
class JobManager:
def __init__(self):
self.active_jobs = [ ]
self.failed_jobs = [ ]
self.job_classes = [ ]
self.active_job = None
def AddJob(self, job):
self.active_jobs.append(job)
self.kick()
def kick(self):
if self.active_job is None:
if len(self.active_jobs):
self.active_job = self.active_jobs.pop(0)
self.active_job.start(self.jobDone)
def jobDone(self, job, problems):
print "job", job, "completed with", problems
if problems:
self.failed_jobs.append(self.active_job)
self.active_job = None
self.kick()
# some examples:
#class PartitionExistsPostcondition:
# def __init__(self, device):
# self.device = device
#
# def check(self, task):
# import os
# return os.access(self.device + "part1", os.F_OK)
#
#class CreatePartitionTask(Task):
# def __init__(self, device):
# Task.__init__(self, _("Create Partition"))
# self.device = device
# self.setTool("/sbin/sfdisk")
# self.args += ["-f", self.device + "disc"]
# self.initial_input = "0,\n;\n;\n;\ny\n"
# self.postconditions.append(PartitionExistsPostcondition(self.device))
#
#class CreateFilesystemTask(Task):
# def __init__(self, device, partition = 1, largefile = True):
# Task.__init__(self, _("Create Filesystem"))
# self.setTool("/sbin/mkfs.ext")
# if largefile:
# self.args += ["-T", "largefile"]
# self.args.append("-m0")
# self.args.append(device + "part%d" % partition)
#
#class FilesystemMountTask(Task):
# def __init__(self, device, partition = 1, filesystem = "ext3"):
# Task.__init__(self, _("Mounting Filesystem"))
# self.setTool("/bin/mount")
# if filesystem is not None:
# self.args += ["-t", filesystem]
# self.args.append(device + "part%d" % partition)
#
#class DiskspacePrecondition:
# def __init__(self, diskspace_required):
# self.diskspace_required = diskspace_required
#
# def check(self, task):
# return getFreeDiskspace(task.workspace) >= self.diskspace_required
#
class ToolExistsPrecondition:
def check(self, task):
import os
return os.access(task.cmd, os.X_OK)
class ReturncodePostcondition:
def check(self, task):
return task.returncode == 0
#class HDDInitJob(Job):
# def __init__(self, device):
# Job.__init__(self, _("Initialize Harddisk"))
# self.device = device
# self.fromDescription(self.createDescription())
#
# def fromDescription(self, description):
# self.device = description["device"]
# self.addTask(CreatePartitionTask(self.device))
# self.addTask(CreateFilesystemTask(self.device))
# self.addTask(FilesystemMountTask(self.device))
#
# def createDescription(self):
# return {"device": self.device}
job_manager = JobManager()
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