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mini-syndicate-py
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Actors; Facets; logging; error handling

This commit is contained in:
Tony Garnock-Jones 2019-06-23 21:43:52 +01:00
parent a068acb2f7
commit 3b34b86bf1
4 changed files with 233 additions and 40 deletions
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7
chat.py
View File

@ -33,11 +33,12 @@ names = ['Daria', 'Kendra', 'Danny', 'Rufus', 'Diana', 'Arnetta', 'Dominick', 'M
me = random.choice(names) + '_' + str(random.randint(10, 1000))
with conn.turn() as t:
S.Endpoint(t, Present(me))
S.Endpoint(t, S.Observe(Present(S.CAPTURE)),
with conn.actor().react(t) as facet:
facet.add(Present(me))
facet.add(S.Observe(Present(S.CAPTURE)),
on_add=lambda t, who: print(who, 'joined'),
on_del=lambda t, who: print(who, 'left'))
S.Endpoint(t, S.Observe(Says(S.CAPTURE, S.CAPTURE)),
facet.add(S.Observe(Says(S.CAPTURE, S.CAPTURE)),
on_msg=lambda t, who, what: print(who, 'said', repr(what)))
async def on_connected():

14
ovlinfo.py
View File

@ -19,22 +19,14 @@ def summarise_uplinks():
print(repr(uplinks))
with conn.turn() as t:
S.Endpoint(t, S.Observe(OverlayLink(S.CAPTURE, S.CAPTURE)),
with conn.actor().react(t) as facet:
facet.add(S.Observe(OverlayLink(S.CAPTURE, S.CAPTURE)),
on_add=add_uplink,
on_del=del_uplink)
async def on_connected():
print('-'*50, 'Connected')
async def on_disconnected(did_connect):
if did_connect:
print('-'*50, 'Disconnected')
else:
await asyncio.sleep(2)
return True
loop = asyncio.get_event_loop()
loop.set_debug(True)
loop.run_until_complete(conn.reconnecting_main(loop, on_connected, on_disconnected))
loop.run_until_complete(conn.reconnecting_main(loop))
loop.stop()
loop.run_forever()
loop.close()

2
setup.py
View File

@ -5,7 +5,7 @@ except ImportError:
setup(
name="mini-syndicate",
version="0.0.4",
version="0.0.5",
author="Tony Garnock-Jones",
author_email="tonyg@leastfixedpoint.com",
license="GNU General Public License v3 or later (GPLv3+)",

234
syndicate/mini/core.py
View File

@ -37,23 +37,33 @@ class Turn(object):
self.conn = conn
self.items = []
def _ensure(self, what):
if self.items is None:
raise Exception('Attempt to %s a completed Turn' % (what,))
def _extend(self, item):
self._ensure('extend')
self.items.append(item)
def _reset(self):
self._ensure('reset')
self.items.clear()
def _commit(self):
if self.items:
self.conn._send(protocol.Turn(self.items))
self._reset()
self._ensure('commit')
if self.items: self.conn._send(protocol.Turn(self.items))
self.items = None
def send(self, message):
self._extend(protocol.Message(message))
def merge_into(self, other):
self._ensure('merge from')
other._ensure('merge into')
if self.items: other.items.extend(self.items)
self.items.clear()
def __enter__(self):
if self.items:
raise Exception('Cannot reenter with statement for Turn')
return self
def __exit__(self, t, v, tb):
@ -63,16 +73,189 @@ class Turn(object):
def _fresh_id(assertion):
return uuid('sub' if Observe.isClassOf(assertion) else 'pub')
class FacetSetupContext(object):
def __init__(self, turn, facet):
self.turn = turn
self.facet = facet
def __enter__(self):
return self.facet
def __exit__(self, t, v, tb):
if t is None:
self.facet.start(self.turn)
else:
self.facet.actor.kill(self.turn, (t, v, tb))
_next_actor_number = 0
def _next_actor_name():
global _next_actor_number
n = _next_actor_number
_next_actor_number = n + 1
return str(n)
class Actor(object):
def __init__(self, conn, name=None):
self.conn = conn
self.name = name or _next_actor_name()
self.children = set()
self.alive = True
self._log = None
@property
def log(self):
if self._log is None:
self._log = logging.getLogger('syndicate.mini.Actor.%s' % (self.name,))
return self._log
def react(self, turn):
return FacetSetupContext(turn, Facet(self.conn, self, self))
def _add_child(self, facet):
if not self.alive:
raise Exception('Cannot add facet because actor is termianted')
self.children.add(facet)
def guard(self, turn):
return ActorGuard(turn, self)
def is_inert(self):
return len(self.children) == 0
def _stop(self, turn, pending, is_abort):
for child in list(self.children):
child._stop(turn, pending, is_abort)
self.children.clear()
def stop(self, turn):
self.alive = False
pending = []
self._stop(turn, pending, False)
for t in pending: t(turn)
def kill(self, turn, exc_info):
log.error('%r%s died', self, repr(self.name) if self.name else '', exc_info=exc_info)
for child in list(self.children):
child._abort(turn)
self.children.clear()
class ActorGuard(object):
def __init__(self, turn, actor):
self.turn = turn
self.actor = actor
def __enter__(self):
pass
def __exit__(self, t, v, tb):
if t is not None:
self.actor.kill(self.turn, (t, v, tb))
return True ## suppress exception
class Facet(object):
def __init__(self, conn, actor, parent):
self.conn = conn
self.actor = actor
self.parent = parent
if parent:
parent._add_child(self)
self.children = set()
self.start_callbacks = []
self.stop_callbacks = []
self.endpoints = []
self.state = 0
@property
def log(self):
return self.actor.log
def _ensure_state(self, wanted_state, message):
if self.state != wanted_state:
raise Exception(message)
def _add_child(self, facet):
self._ensure_state(1, 'Cannot add child facet in this state')
self.children.add(facet)
def react(self, turn):
self._ensure_state(1, 'Cannot create subfacet in this state')
return FacetSetupContext(turn, Facet(self.conn, self.actor, self))
def add(self, *args, **kwargs):
self._ensure_state(0, 'Cannot add endpoint to facet in this state')
endpoint = Endpoint(self, *args, **kwargs)
self.endpoints.append(endpoint)
return endpoint
def on_start(self, callback):
self._ensure_state(0, 'Cannot add on_start callback to facet in this state')
self.start_callbacks.append(callback)
def on_stop(self, callback):
self._ensure_state(0, 'Cannot add on_stop callback to facet in this state')
self.stop_callbacks.append(callback)
def start(self, turn):
self._ensure_state(0, 'Cannot start facet in this state')
self.state = 1
for e in self.endpoints: e._start(turn)
for t in self.start_callbacks: t(turn)
self.start_callbacks.clear()
def is_inert(self):
return len(self.children) == 0 and len(self.endpoints) == 0
def _stop(self, turn, pending, is_abort):
if turn.conn is not self.conn:
raise Exception('Attempted to stop facet from wrong connection')
if self.state == 0 and not is_abort:
raise Exception('Cannot stop facet before starting it')
if self.state != 1: ## stopping is idempotent
return
self.state = 2
if self.parent:
self.parent.children.remove(self)
for child in list(self.children):
child._stop(turn, pending, is_abort)
self.children.clear()
if not is_abort:
pending.extend(self.stop_callbacks)
for endpoint in self.endpoints:
endpoint.clear(turn)
self.endpoints.clear()
if not is_abort:
if self.parent and self.parent.is_inert():
self.parent._stop(turn, pending, is_abort)
def stop(self, turn):
pending = []
self._stop(turn, pending, False)
for t in pending: t(turn)
def _abort(self, turn):
self._stop(turn, None, True)
class Endpoint(object):
def __init__(self, turn, assertion,
on_add=None, on_del=None, on_msg=None):
self.assertion = None
def __init__(self, facet, assertion, on_add=None, on_del=None, on_msg=None):
self.facet = facet
self.assertion = assertion
self.id = None
self.on_add = on_add or _ignore
self.on_del = on_del or _ignore
self.on_msg = on_msg or _ignore
self.cache = set()
self.set(turn, assertion)
@property
def log(self):
return self.facet.log
def _start(self, turn):
self.set(turn, self.assertion)
def set(self, turn, new_assertion, on_transition=None):
if self.id is not None:
@ -98,11 +281,13 @@ class Endpoint(object):
self.assertion))
else:
self.cache.add(captures)
with self.facet.actor.guard(turn):
self.on_add(turn, *captures)
def _del(self, turn, captures):
if captures in self.cache:
self.cache.discard(captures)
with self.facet.actor.guard(turn):
self.on_del(turn, *captures)
else:
log.error('Server error: nonexistent captures %r removed from endpoint %r %r' % (
@ -111,6 +296,7 @@ class Endpoint(object):
self.assertion))
def _msg(self, turn, captures):
with self.facet.actor.guard(turn):
self.on_msg(turn, *captures)
class DummyEndpoint(object):
@ -125,6 +311,10 @@ class Connection(object):
self.scope = scope
self.endpoints = {}
self.end_callbacks = {}
self._is_connected = False
def is_connected(self):
return self._is_connected
def _each_endpoint(self):
return list(self.endpoints.values())
@ -132,6 +322,9 @@ class Connection(object):
def turn(self):
return Turn(self)
def actor(self, name=None):
return Actor(self, name=name)
def destroy(self):
with self.turn() as t:
for ep in self._each_endpoint():
@ -155,6 +348,7 @@ class Connection(object):
turn._extend(protocol.Assert(ep.id, ep.assertion))
def _on_disconnected(self):
self._is_connected = False
with self.turn() as t:
for ep in self._each_endpoint():
ep._reset(t)
@ -166,6 +360,7 @@ class Connection(object):
with self.turn() as t:
for ep in self._each_endpoint():
self._map_endpoint(t, ep)
self._is_connected = True
def _lookup(self, endpointId):
return self.endpoints.get(endpointId, _dummy_endpoint)
@ -209,19 +404,24 @@ class Connection(object):
async def reconnecting_main(self, loop, on_connected=None, on_disconnected=None):
should_run = True
while should_run:
did_connect = await self.main(loop, on_connected=on_connected)
if on_disconnected:
should_run = await on_disconnected(did_connect)
else:
if did_connect:
pass # Reconnect immediately
else:
await asyncio.sleep(2)
did_connect = await self.main(loop, on_connected=(on_connected or _default_on_connected))
should_run = await (on_disconnected or _default_on_disconnected)(did_connect)
@classmethod
def from_url(cls, s):
return url.connection_from_url(s)
async def _default_on_connected():
log.info('Connected')
async def _default_on_disconnected(did_connect):
if did_connect:
# Reconnect immediately
log.info('Disconnected')
else:
await asyncio.sleep(2)
return True
class _StreamConnection(Connection, asyncio.Protocol):
def __init__(self, scope):
super().__init__(scope)