def _get_task_parents(self, taskid): parents = [] for tid in self._tasks: parenttask = storage.get(tid) if 'consumers' in parenttask and taskid in parenttask['consumers']: parents.append(tid) return parents
def _get_task_parents(self, taskid):
parents = []
for tid in self._tasks:
parenttask = storage.get(tid)
if 'consumers' in parenttask and taskid in parenttask['consumers']:
parents.append(tid)
return parents
def start(self):
# 1. Determine the order of tasks
# 2. Spin up first task, passing
# a. Args from storage
# b. and callback to what to do after it's done.
# Task runner positions recorded in Hive roster don't have "require" or "depends on"
# What is stored along with Tasks's ID is a list of "consumers" -
# 'I hand over control to these task IDs after I am done'
# This is done so that when a long-running task completes, and its rules
# were rewritten while it ran, instead of rescanning the whole task tree
# and figuring out who now depends on it, the task's locker at this Hive will
# have a list of who to talk to next.
# The Task.REQUIRE list burned into each task should not bother us now,
# as that is a list of other components this task "needs to be around in general"
# I would assume these were ran by tasks initializer at the start of server run,
# Once these are *inited* in order, they should be designed to be *ran()* async
# But, for first run, we need the opposite data - which of the tasks don't have parents.
# we start them all simultaneously
logging.debug(HELLO + "Initing TaskHive %s" % self.id)
parent_count = {}
task_ids = storage.get(self.id).get('tasks', [])
# this loop marks task runners that depend on other runners
# we also use the looping opportunity to set up Strorage event watches.
for task_id in task_ids:
self._add_to_watched_tasks(task_id)
for consumer in storage.get(task_id, {}).get('consumers', []):
parent_count[consumer] = parent_count.get(consumer, 0) + 1
already_running = self._running_tasks_map.keys()
# here we run only those of them that do NOT have parents or are not already running.
for task_id in task_ids:
task_data = storage.get(task_id)
if task_data and not parent_count.get(
task_id) and task_id not in already_running:
self.run_task(task_id, task_data)
def stop(self):
for callback in self._running_tasks.keys():
if callback:
task_id, kw = self._running_tasks.get( callback, ['', {}] )
tasktype = self.get_tasktypes().get(storage.get(task_id, {}).get('tasktype','not to be found'))
if tasktype and hasattr(tasktype, 'stop'):
kw['callback'] = callback
try:
tasktype.stop(**kw)
except Exception as ex:
logging.debug(HELLO + "Stopping task '' errored out with ''" % (tasktype.ID, ex.message))
def start(self):
# 1. Determine the order of tasks
# 2. Spin up first task, passing
# a. Args from storage
# b. and callback to what to do after it's done.
# Task runner positions recorded in Hive roster don't have "require" or "depends on"
# What is stored along with Tasks's ID is a list of "consumers" -
# 'I hand over control to these task IDs after I am done'
# This is done so that when a long-running task completes, and its rules
# were rewritten while it ran, instead of rescanning the whole task tree
# and figuring out who now depends on it, the task's locker at this Hive will
# have a list of who to talk to next.
# The Task.REQUIRE list burned into each task should not bother us now,
# as that is a list of other components this task "needs to be around in general"
# I would assume these were ran by tasks initializer at the start of server run,
# Once these are *inited* in order, they should be designed to be *ran()* async
# But, for first run, we need the opposite data - which of the tasks don't have parents.
# we start them all simultaneously
logging.debug(HELLO + "Initing TaskHive %s" % self.id)
parent_count = {}
task_ids = storage.get(self.id).get('tasks', [])
# this loop marks task runners that depend on other runners
# we also use the looping opportunity to set up Strorage event watches.
for task_id in task_ids:
self._add_to_watched_tasks(task_id)
for consumer in storage.get(task_id,{}).get('consumers',[]):
parent_count[consumer] = parent_count.get(consumer, 0) + 1
already_running = self._running_tasks_map.keys()
# here we run only those of them that do NOT have parents or are not already running.
for task_id in task_ids:
task_data = storage.get(task_id)
if task_data and not parent_count.get(task_id) and task_id not in already_running:
self.run_task(task_id, task_data)
def _hive_tasks_change_handler(self):
# we store a local copy of tasks roster between handler runs.
# this is done so that repeat, or snoball calls don't restart
# tasks needlessly.
# here we only handle additions and removals of tasks.
# individual task state changes are handled by other code.
oldtasks = self._tasks
self._tasks = newtasks = set( storage.get(self.id).get('tasks', []) )
removed = oldtasks.difference(newtasks)
added = newtasks.difference(oldtasks)
for taskid in removed:
with self._taskswatchers_lock:
if taskid in self._taskswatchers:
del self._taskswatchers[taskid] # callback goes poof on the other end.
self.stop_task(taskid)
for taskid in added:
self._add_to_watched_tasks(taskid)
if not self._get_task_parents(taskid) and not storage.get(taskid,{}).get('paused'):
self.run_task(taskid, storage.get(taskid))
def _hive_tasks_change_handler(self):
# we store a local copy of tasks roster between handler runs.
# this is done so that repeat, or snoball calls don't restart
# tasks needlessly.
# here we only handle additions and removals of tasks.
# individual task state changes are handled by other code.
oldtasks = self._tasks
self._tasks = newtasks = set(storage.get(self.id).get('tasks', []))
removed = oldtasks.difference(newtasks)
added = newtasks.difference(oldtasks)
for taskid in removed:
with self._taskswatchers_lock:
if taskid in self._taskswatchers:
del self._taskswatchers[
taskid] # callback goes poof on the other end.
self.stop_task(taskid)
for taskid in added:
self._add_to_watched_tasks(taskid)
if not self._get_task_parents(taskid) and not storage.get(
taskid, {}).get('paused'):
self.run_task(taskid, storage.get(taskid))
def stop(self):
for callback in self._running_tasks.keys():
if callback:
task_id, kw = self._running_tasks.get(callback, ['', {}])
tasktype = self.get_tasktypes().get(
storage.get(task_id, {}).get('tasktype',
'not to be found'))
if tasktype and hasattr(tasktype, 'stop'):
kw['callback'] = callback
try:
tasktype.stop(**kw)
except Exception as ex:
logging.debug(HELLO +
"Stopping task '' errored out with ''" %
(tasktype.ID, ex.message))
def stop_task(self, taskid):
was_running = False
callback = self._running_tasks_map.get(taskid)
if callback:
stored_taskid, kw = self._running_tasks.get(callback, ['', {}])
tasktype = self.get_tasktypes().get(storage.get(stored_taskid, {}).get('tasktype','not to be found'))
if tasktype and hasattr(tasktype, 'stop'):
kw['callback'] = callback
try:
tasktype.stop(**kw)
was_running = True
except Exception as ex:
logging.debug(HELLO + "Stopping task '' errored out with ''" % (tasktype.ID, ex.message))
return was_running
def stop_task(self, taskid):
was_running = False
callback = self._running_tasks_map.get(taskid)
if callback:
stored_taskid, kw = self._running_tasks.get(callback, ['', {}])
tasktype = self.get_tasktypes().get(
storage.get(stored_taskid, {}).get('tasktype',
'not to be found'))
if tasktype and hasattr(tasktype, 'stop'):
kw['callback'] = callback
try:
tasktype.stop(**kw)
was_running = True
except Exception as ex:
logging.debug(HELLO +
"Stopping task '' errored out with ''" %
(tasktype.ID, ex.message))
return was_running
def is_paused(self):
return bool(storage.get(self.id).get('paused'))
def process_callback(self, task_id, *args, **kw):
'''
This converts output arguments (those the done task pushed to the callback)
into input arguments for each of the to-be-called-next task.
'''
#logging.debug(HELLO + "Processing callback on hive '%s' for args '%s'" % (self.id, args))
donetask = storage.get(task_id)
if not donetask:
# which may happen if task was removed from the roster while it was running
return
# tasktypes = self.get_tasktypes()
# donetasktype = tasktypes.get(donetask['type'])
# if not donetasktype:
# # kinda hard to imagine, but, heck..
# return
consumers = [[consumer_id, storage.get(consumer_id)] for consumer_id in donetask.get('consumers',[])]
if not consumers:
return
# Preassemblying input args.
# in python, as long as you don't splat-collect args in the function,
# all positional args can be pulled into dictionary and
# applied to the function as named args.
# we rely on that here.
# in other words, DO NOT USE SPLAT ("*args, **kw") in Task run() declaration.
incoming_args_def = donetask.get('outputs',[])
incoming_name_type_map = {}
incoming_args = {}
for arg in incoming_args_def:
# arg is [default value, type, name, description]
value, typename, name = arg[:3]
if name in kw:
incoming_args[name] = kw[name]
incoming_name_type_map[name] = typename
for arg_position in xrange(min( len(args), len(incoming_args_def) )):
value, typename, name = incoming_args_def[arg_position][:3]
# [default value, type, name, description]
incoming_args[name] = args[arg_position]
incoming_name_type_map[name] = typename
# we allow task runners to push back updates to task records.
# web server task can push back update to task label with
# port number that was autopicked by the server. etc.
updateargtype = 'MetadataUpdate'
updateargname = updateargtype.lower()
if updateargname in incoming_args and \
incoming_name_type_map[updateargname] == updateargtype:
storage.change(donetask.id, incoming_args[updateargname])
del incoming_args[updateargname]
for consumer in consumers:
# consumer is an array [id, metadata object]
if consumer[1]:
self.run_task(
consumer[0]
, consumer[1]
, task_id
, incoming_args
, incoming_name_type_map
)
def is_paused(self):
return bool(storage.get(self.id).get('paused'))
def process_callback(self, task_id, *args, **kw):
'''
This converts output arguments (those the done task pushed to the callback)
into input arguments for each of the to-be-called-next task.
'''
#logging.debug(HELLO + "Processing callback on hive '%s' for args '%s'" % (self.id, args))
donetask = storage.get(task_id)
if not donetask:
# which may happen if task was removed from the roster while it was running
return
# tasktypes = self.get_tasktypes()
# donetasktype = tasktypes.get(donetask['type'])
# if not donetasktype:
# # kinda hard to imagine, but, heck..
# return
consumers = [[consumer_id, storage.get(consumer_id)]
for consumer_id in donetask.get('consumers', [])]
if not consumers:
return
# Preassemblying input args.
# in python, as long as you don't splat-collect args in the function,
# all positional args can be pulled into dictionary and
# applied to the function as named args.
# we rely on that here.
# in other words, DO NOT USE SPLAT ("*args, **kw") in Task run() declaration.
incoming_args_def = donetask.get('outputs', [])
incoming_name_type_map = {}
incoming_args = {}
for arg in incoming_args_def:
# arg is [default value, type, name, description]
value, typename, name = arg[:3]
if name in kw:
incoming_args[name] = kw[name]
incoming_name_type_map[name] = typename
for arg_position in xrange(min(len(args), len(incoming_args_def))):
value, typename, name = incoming_args_def[arg_position][:3]
# [default value, type, name, description]
incoming_args[name] = args[arg_position]
incoming_name_type_map[name] = typename
# we allow task runners to push back updates to task records.
# web server task can push back update to task label with
# port number that was autopicked by the server. etc.
updateargtype = 'MetadataUpdate'
updateargname = updateargtype.lower()
if updateargname in incoming_args and \
incoming_name_type_map[updateargname] == updateargtype:
storage.change(donetask.id, incoming_args[updateargname])
del incoming_args[updateargname]
for consumer in consumers:
# consumer is an array [id, metadata object]
if consumer[1]:
self.run_task(consumer[0], consumer[1], task_id, incoming_args,
incoming_name_type_map)
