commit 559c3fa2969346234c86a510ad9c78c6d0baa21b Author: Arturo Filastò art@fuffa.org Date: Thu Jan 10 16:08:45 2013 +0100

Start outlining the Manager classes (#7852)

These will keep track of the running measurements and reporting tasks. --- ooni/managers.py | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 130 insertions(+), 0 deletions(-)

diff --git a/ooni/managers.py b/ooni/managers.py new file mode 100644 index 0000000..2bffe0f --- /dev/null +++ b/ooni/managers.py @@ -0,0 +1,130 @@ +import itertools + +from .ratelimiting import StaticRateLimiter +from .measurements import Measurement, NetTest + +class MeasurementsManager(object): + """ + This is the Measurement Tracker. In here we keep track of active measurements + and issue new measurements once the active ones have been completed. + + MeasurementTracker does not keep track of the typology of measurements that + it is running. It just considers a measurement something that has an input + and a method to be called. + + NetTest on the contrary is aware of the typology of measurements that it is + dispatching as they are logically grouped by test file. + """ + retries = 2 + + failures = [] + concurrency = 10 + + _measurements = iter() + _active_measurements = [] + + def __init__(self, manager, netTests=None): + self.netTests = netTests if netTests else [] + self.manager = manager + + @property + def failedMeasurements(self): + return len(self.failures) + + def start(self): + """ + Start running the measurements. + """ + self.populateMeasurements() + self.runMoreMeasurements() + + def populateMeasurements(self): + """ + Take all the setup netTests and create the measurements iterator from + them. + """ + for net_test in self.netTests: + self._measurements = itertools.chain(self._measurements, + net_test.generateMeasurements()) + + def availableSlots(self): + """ + Returns the number of available slots for running tests. + """ + return self.concurrency - len(self._active_measurements) + + def schedule(self, measurement): + self._active_measurements.append(measurement) + + d = measurement.run() + d.addCallback(self.done) + d.addCallback(self.failed) + return d + + def fillSlots(self): + """ + Called on test completion and schedules measurements to be run for the + available slots. + """ + for _ in range(self.availableSlots()): + try: + measurement = self._measurements.next() + self.schedule(measurement) + except StopIteration: + break + + def done(self, result, measurement): + """ + We have successfully completed a measurement. + """ + self._active_measurements.remove(measurement) + self.completedMeasurements += 1 + + self.fillSlots() + + def failed(self, failure, measurement): + """ + The measurement has failed to complete. + """ + self._active_measurements.remove(measurement) + self.failures.append((failure, measurement)) + + if measurement.failures < self.retries: + self._measurements = itertools.chain(self._measurements, + iter(measurement)) + + self.fillSlots() + +class OManager(object): + """ + Singleton object responsible for managing the Measurements Tracker and the + Reporting Tracker. + """ + + _scheduledTests = 0 + + def __init__(self, reporters=[]): + self.reporters = reporters + + self.netTests = [] + + self.measurements_tracker = MeasurementsTracker(manager=self, + netTests=self.netTests) + self.measurements_tracker.manager = self + + def writeReport(self, measurement): + """ + Write to all the configured reporters. + """ + for reporter in self.reporters: + reporter.write(measurement) + + def writeFailure(self, measurement, failure): + pass + + def addNetTest(self, net_test): + """ + This is called to add a NetTest to the list of running network tests. + """ + self.netTests.append(net_test) +