def print_task_states(flowdetail, msg):
eu.print_wrapped(msg)
print("Flow '%s' state: %s" % (flowdetail.name, flowdetail.state))
# Sort by these so that our test validation doesn't get confused by the
# order in which the items in the flow detail can be in.
items = sorted((td.name, td.version, td.state, td.results)
for td in flowdetail)
for item in items:
print(" %s==%s: %s, result=%s" % item)
def print_task_states(flowdetail, msg):
eu.print_wrapped(msg)
print("Flow '%s' state: %s" % (flowdetail.name, flowdetail.state))
# Sort by these so that our test validation doesn't get confused by the
# order in which the items in the flow detail can be in.
items = sorted(
(td.name, td.version, td.state, td.results) for td in flowdetail)
for item in items:
print(" %s==%s: %s, result=%s" % item)
def execute(self):
if self._no_slow:
eu.print_wrapped(self._text)
else:
with slow_down():
eu.print_wrapped(self._text)
WriteNetworkSettings("write_net_settings"),
),
# This does all the volume stuff.
gf.Flow("volume-maker").add(
AllocateVolumes("allocate_my_volumes", provides='volumes'),
FormatVolumes("volume_formatter"),
),
# Finally boot it all.
BootVM("boot-it"),
),
# Ya it worked!
PrintText("Finished vm create.", no_slow=True),
PrintText("Instance is running!", no_slow=True))
return flow
eu.print_wrapped("Initializing")
# Setup the persistence & resumption layer.
with eu.get_backend() as backend:
try:
book_id, flow_id = sys.argv[2].split("+", 1)
if not uuidutils.is_uuid_like(book_id):
book_id = None
if not uuidutils.is_uuid_like(flow_id):
flow_id = None
except (IndexError, ValueError):
book_id = None
flow_id = None
# Set up how we want our engine to run, serial, parallel...
executor = None
with utils.wrap_all_failures():
zag.engines.run(flow, store=store, engine='parallel')
except exceptions.WrappedFailure as ex:
unknown_failures = []
for a_failure in ex:
if a_failure.check(FirstException):
print("Got FirstException: %s" % a_failure.exception_str)
elif a_failure.check(SecondException):
print("Got SecondException: %s" % a_failure.exception_str)
else:
print("Unknown failure: %s" % a_failure)
unknown_failures.append(a_failure)
failure.Failure.reraise_if_any(unknown_failures)
eu.print_wrapped("Raise and catch first exception only")
run(sleep1=0.0, raise1=True, sleep2=0.0, raise2=False)
# NOTE(imelnikov): in general, sleeping does not guarantee that we'll have both
# task running before one of them fails, but with current implementation this
# works most of times, which is enough for our purposes here (as an example).
eu.print_wrapped("Raise and catch both exceptions")
run(sleep1=1.0, raise1=True, sleep2=1.0, raise2=True)
eu.print_wrapped("Handle one exception, and re-raise another")
try:
run(sleep1=1.0, raise1=True, sleep2=1.0, raise2='boom')
except TypeError as ex:
print("As expected, TypeError is here: %s" % ex)
else:
assert False, "TypeError expected"
def execute(self):
if self._no_slow:
eu.print_wrapped(self._text)
else:
with slow_down():
eu.print_wrapped(self._text)
),
# This does all the volume stuff.
gf.Flow("volume-maker").add(
AllocateVolumes("allocate_my_volumes", provides='volumes'),
FormatVolumes("volume_formatter"),
),
# Finally boot it all.
BootVM("boot-it"),
),
# Ya it worked!
PrintText("Finished vm create.", no_slow=True),
PrintText("Instance is running!", no_slow=True))
return flow
eu.print_wrapped("Initializing")
# Setup the persistence & resumption layer.
with eu.get_backend() as backend:
# Try to find a previously passed in tracking id...
try:
book_id, flow_id = sys.argv[2].split("+", 1)
if not uuidutils.is_uuid_like(book_id):
book_id = None
if not uuidutils.is_uuid_like(flow_id):
flow_id = None
except (IndexError, ValueError):
book_id = None
flow_id = None
taskflow.engines.run(flow, store=store,
engine='parallel')
except exceptions.WrappedFailure as ex:
unknown_failures = []
for a_failure in ex:
if a_failure.check(FirstException):
print("Got FirstException: %s" % a_failure.exception_str)
elif a_failure.check(SecondException):
print("Got SecondException: %s" % a_failure.exception_str)
else:
print("Unknown failure: %s" % a_failure)
unknown_failures.append(a_failure)
failure.Failure.reraise_if_any(unknown_failures)
eu.print_wrapped("Raise and catch first exception only")
run(sleep1=0.0, raise1=True,
sleep2=0.0, raise2=False)
# NOTE(imelnikov): in general, sleeping does not guarantee that we'll have both
# task running before one of them fails, but with current implementation this
# works most of times, which is enough for our purposes here (as an example).
eu.print_wrapped("Raise and catch both exceptions")
run(sleep1=1.0, raise1=True,
sleep2=1.0, raise2=True)
eu.print_wrapped("Handle one exception, and re-raise another")
try:
run(sleep1=1.0, raise1=True,
sleep2=1.0, raise2='boom')
except TypeError as ex:
object_targets = []
store = {}
for source in source_files:
source_stored = '%s-source' % source
object_stored = '%s-object' % source
store[source_stored] = source
object_targets.append(object_stored)
flow.add(CompileTask(name='compile-%s' % source,
rebind={'source_filename': source_stored},
provides=object_stored))
flow.add(BuildDocsTask(requires=list(store.keys())))
# Try this to see executable_only switch broken:
object_targets.append('docs')
link_task = LinkTask('build/executable', requires=object_targets)
flow.add(link_task)
if executable_only:
flow.set_target(link_task)
return flow, store
if __name__ == "__main__":
SOURCE_FILES = ['first.c', 'second.cpp', 'main.cpp']
eu.print_wrapped('Running all tasks:')
flow, store = make_flow_and_store(SOURCE_FILES)
taskflow.engines.run(flow, store=store)
eu.print_wrapped('Building executable, no docs:')
flow, store = make_flow_and_store(SOURCE_FILES, executable_only=True)
taskflow.engines.run(flow, store=store)
"engine_installed": True,
"doors_installed": True,
"windows_installed": True,
"wheels_installed": True,
}
engine = taskflow.engines.load(flow, store={'spec': spec.copy()})
# This registers all (ANY) state transitions to trigger a call to the
# flow_watch function for flow state transitions, and registers the
# same all (ANY) state transitions for task state transitions.
engine.notifier.register(ANY, flow_watch)
engine.task_notifier.register(ANY, task_watch)
eu.print_wrapped("Building a car")
engine.run()
# Alter the specification and ensure that the reverting logic gets triggered
# since the resultant car that will be built by the build_wheels function will
# build a car with 4 doors only (not 5), this will cause the verification
# task to mark the car that is produced as not matching the desired spec.
spec['doors'] = 5
engine = taskflow.engines.load(flow, store={'spec': spec.copy()})
engine.notifier.register(ANY, flow_watch)
engine.task_notifier.register(ANY, task_watch)
eu.print_wrapped("Building a wrong car that doesn't match specification")
try:
engine.run()
backend_uri = "sqlite:///%s" % (persist_path)
else:
persist_path = os.path.join(tempfile.gettempdir(), "persisting")
backend_uri = "file:///%s" % (persist_path)
if os.path.exists(persist_path):
blowup = False
else:
blowup = True
with eu.get_backend(backend_uri) as backend:
# Make a flow that will blow up if the file didn't exist previously, if it
# did exist, assume we won't blow up (and therefore this shows the undo
# and redo that a flow will go through).
book = models.LogBook("my-test")
flow = make_flow(blowup=blowup)
eu.print_wrapped("Running")
try:
eng = engines.load(flow, engine='serial', backend=backend, book=book)
eng.run()
if not blowup:
eu.rm_path(persist_path)
except Exception:
# NOTE(harlowja): don't exit with non-zero status code, so that we can
# print the book contents, as well as avoiding exiting also makes the
# unit tests (which also runs these examples) pass.
traceback.print_exc(file=sys.stdout)
eu.print_wrapped("Book contents")
print(book.pformat())
def trash(**kwargs):
eu.print_wrapped("Throwing away pieces of car!")
# installed is not a car after all.
"engine_installed": True,
"doors_installed": True,
"windows_installed": True,
"wheels_installed": True,
}
engine = taskflow.engines.load(flow, store={'spec': spec.copy()})
# This registers all (ANY) state transitions to trigger a call to the
# flow_watch function for flow state transitions, and registers the
# same all (ANY) state transitions for task state transitions.
engine.notifier.register(ANY, flow_watch)
engine.task_notifier.register(ANY, task_watch)
eu.print_wrapped("Building a car")
engine.run()
# Alter the specification and ensure that the reverting logic gets triggered
# since the resultant car that will be built by the build_wheels function will
# build a car with 4 doors only (not 5), this will cause the verification
# task to mark the car that is produced as not matching the desired spec.
spec['doors'] = 5
engine = taskflow.engines.load(flow, store={'spec': spec.copy()})
engine.notifier.register(ANY, flow_watch)
engine.task_notifier.register(ANY, task_watch)
eu.print_wrapped("Building a wrong car that doesn't match specification")
try:
engine.run()
else:
persist_path = os.path.join(tempfile.gettempdir(), "persisting")
backend_uri = "file:///%s" % (persist_path)
if os.path.exists(persist_path):
blowup = False
else:
blowup = True
with eu.get_backend(backend_uri) as backend:
# Make a flow that will blow up if the file didn't exist previously, if it
# did exist, assume we won't blow up (and therefore this shows the undo
# and redo that a flow will go through).
book = logbook.LogBook("my-test")
flow = make_flow(blowup=blowup)
eu.print_wrapped("Running")
try:
eng = engines.load(flow, engine='serial',
backend=backend, book=book)
eng.run()
if not blowup:
eu.rm_path(persist_path)
except Exception:
# NOTE(harlowja): don't exit with non-zero status code, so that we can
# print the book contents, as well as avoiding exiting also makes the
# unit tests (which also runs these examples) pass.
traceback.print_exc(file=sys.stdout)
eu.print_wrapped("Book contents")
print(p_utils.pformat(book))
# Create a place where the persistence information will be stored.
book = models.LogBook("example")
flow_detail = models.FlowDetail("resume from backend example",
uuid=uuidutils.generate_uuid())
book.add(flow_detail)
with contextlib.closing(backend.get_connection()) as conn:
conn.save_logbook(book)
# CREATE AND RUN THE FLOW: FIRST ATTEMPT ####################
flow = flow_factory()
engine = taskflow.engines.load(flow, flow_detail=flow_detail,
book=book, backend=backend)
print_task_states(flow_detail, "At the beginning, there is no state")
eu.print_wrapped("Running")
engine.run()
print_task_states(flow_detail, "After running")
# RE-CREATE, RESUME, RUN ####################################
eu.print_wrapped("Resuming and running again")
# NOTE(harlowja): reload the flow detail from backend, this will allow us
# to resume the flow from its suspended state, but first we need to search
# for the right flow details in the correct logbook where things are
# stored.
#
# We could avoid re-loading the engine and just do engine.run() again, but
# this example shows how another process may unsuspend a given flow and
# start it again for situations where this is useful to-do (say the process
flow_detail = models.FlowDetail("resume from backend example",
uuid=uuidutils.generate_uuid())
book.add(flow_detail)
with contextlib.closing(backend.get_connection()) as conn:
conn.save_logbook(book)
# CREATE AND RUN THE FLOW: FIRST ATTEMPT ####################
flow = flow_factory()
engine = zag.engines.load(flow,
flow_detail=flow_detail,
book=book,
backend=backend)
print_task_states(flow_detail, "At the beginning, there is no state")
eu.print_wrapped("Running")
engine.run()
print_task_states(flow_detail, "After running")
# RE-CREATE, RESUME, RUN ####################################
eu.print_wrapped("Resuming and running again")
# NOTE(harlowja): reload the flow detail from backend, this will allow us
# to resume the flow from its suspended state, but first we need to search
# for the right flow details in the correct logbook where things are
# stored.
#
# We could avoid re-loading the engine and just do engine.run() again, but
# this example shows how another process may unsuspend a given flow and
# start it again for situations where this is useful to-do (say the process
def trash(**kwargs):
eu.print_wrapped("Throwing away pieces of car!")
def trash(**kwargs):
print 'this is trash func'
eu.print_wrapped("Throwing away pieces of car!")
