Source¶
Context¶
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from os import path
from signal import SIGINT
from importlib import import_module
from urllib.parse import urlparse
from .proxy import Proxy, set_actor, ProxyRef, TellWrapper
from .exceptions import HostDownError, AlreadyExistsError, NotFoundError, \
HostError, IntervalError
from . import util
# import pyactor.thread.parallels
# parallels = pyactor.thread.parallels
core_type = None
available_types = ['thread', 'green_thread']
actor_module = None
intervals = None
parallels = None
future = None
rpcactor = None
signal = None
def set_rabbit_credentials(user, password):
"""
If you use a RabbitMQ server and want to make remote queries, you might
need to specify new credentials for connection.
By default, PyActor uses the guest RabbitMQ user.
:param str. user: Name for the RabbitMQ user.
:param str. password: Password for the RabbitMQ user.
"""
util.RABBIT_USER = user
util.RABBIT_PASS = password
def set_context(module_name='thread'):
"""
This function initializes the execution context deciding which
type of threads are being used: classic python threads or green
threads, provided by Gevent.
This should be called first of all in every execution, otherwise,
the library would not work.
The default module is 'thread'.
:param str. module_name: Name of the module you want to use
('thread' or 'green_thread').
"""
global core_type
if core_type is None and module_name in available_types:
core_type = module_name
util.core_type = core_type
global actor_module
actor_module = import_module('pyactor.' + module_name + '.actor')
global intervals
intervals = import_module('pyactor.' + module_name + '.intervals')
global parallels
parallels = import_module('pyactor.' + module_name + '.parallels')
global future
future = import_module('pyactor.' + module_name + '.future')
set_actor(module_name)
global rpcactor
rpcactor = import_module('pyactor.' + module_name + '.rpcactor')
global signal
if module_name == 'green_thread':
signal = import_module('gevent')
else:
signal = import_module('signal')
else:
if core_type is not None:
raise Exception("The core type was previously configured.")
raise Exception("Bad core type.")
def create_host(url="local://local:6666/host"):
"""
This is the main function to create a new Host to which you can
spawn actors. It will be set by default at local address if no
parameter *url* is given. This function should be called once
for execution or after calling :meth:`~.shutdown` to the previous
host.
However, it is possible to create locally more than one host
and simulate a remote communication between them if they are of some
remote type (`http` or `amqp`), but the first one created will
be the main host, which is the one hosting the queries from
the main function.
Of course, every host must be initialized with a different URL(port).
Although that, more than one host should not be required for any real
project.
:param str. url: URL where to start and bind the host.
:return: :class:`~.Proxy` to the new host created.
:raises: Exception if there is a host already created with that URL.
"""
if url in util.hosts.keys():
raise HostError("Host already created. Only one host can"
" be ran with the same url.")
else:
if not util.hosts:
util.main_host = Host(url)
util.hosts[url] = util.main_host
else:
util.hosts[url] = Host(url)
return util.hosts[url].proxy
class Host(object):
"""
Host must be created using the function :func:`~create_host`.
Do not create a Host directly.
Host is a container for actors. It manages the spawn and
elimination of actors and their communication through channels. Also
configures the remote points where the actors will be able to receive
and send queries remotely. Additionally, controls the correct management
of its actors' threads and intervals.
The host is managed as an actor itself so you interact with it through
its :class:`~.Proxy`. This allows you to pass it to another host to
spawn remotely.
:param str. url: URL that identifies the host and where to find it.
"""
_tell = {'attach_interval', 'detach_interval', 'hello', 'stop_actor'}
_ask = {'spawn', 'lookup', 'lookup_url', 'say_hello', 'has_actor'}
_ref = {'spawn', 'lookup', 'lookup_url'}
def __init__(self, url):
self.actors = {}
self.threads = {}
self.pthreads = {}
self.intervals = {}
self.locks = {}
self.url = url
self.running = False
self.alive = True
self.__load_transport(url)
self.__init_host()
self.ppool = None
# self.cleaner = interval_host(get_host(), CLEAN_INT, self.do_clean)
def hello(self):
print("Hello!!")
def say_hello(self):
print("Sending hello.")
return "Hello from HOST!!"
def __load_transport(self, url):
"""
For remote communication. Sets this host's communication dispatcher
at the address and port specified.
The scheme must be 'http' if using a XMLRPC dispatcher.
'amqp' for RabbitMQ communications.
This method is internal. Automatically called when creating the host.
:param str. url: URL where to bind the host. Must be provided in
the typical form: 'scheme://address:port/hierarchical_path'
"""
aurl = urlparse(url)
addrl = aurl.netloc.split(':')
self.addr = addrl[0], addrl[1]
self.transport = aurl.scheme
self.host_url = aurl
if aurl.scheme == 'http':
self.__launch_actor('http',
rpcactor.RPCDispatcher(url, self, 'rpc'))
elif aurl.scheme == 'amqp':
self.__launch_actor('amqp', rpcactor.RPCDispatcher(url, self,
'rabbit'))
def spawn(self, aid, klass, *param, **kparam):
"""
This method creates an actor attached to this host. It will be
an instance of the class *klass* and it will be assigned an ID
that identifies it among the host.
This method can be called remotely synchronously.
:param str. aid: identifier for the spawning actor. Unique within
the host.
:param class klass: class type of the spawning actor. If you are
spawning remotely and the class is not in the server module,
you must specify here the path to that class in the form
'module.py/Class' so the server can import the class and create
the instance.
:param param: arguments for the init function of the
spawning actor class.
:param kparam: arguments for the init function of the
spawning actor class.
:return: :class:`~.Proxy` to the spawned actor.
:raises: :class:`AlreadyExistsError`, if the ID specified is
already in use.
:raises: :class:`HostDownError` if the host is not initiated.
"""
if param is None:
param = []
if not self.alive:
raise HostDownError()
if isinstance(klass, str):
module, klass = klass.split('/')
module_ = __import__(module, globals(), locals(),
[klass])
klass_ = getattr(module_, klass)
elif isinstance(klass, type):
klass_ = klass
else:
raise Exception(f"Given class is not a class: {klass}")
url = f'{self.transport}://{self.host_url.netloc}/{aid}'
if url in self.actors.keys():
raise AlreadyExistsError(url)
else:
obj = klass_(*param, **kparam)
obj.id = aid
obj.url = url
if self.running:
obj.host = self.proxy
# else:
# obj.host = Exception("Host is not an active actor. \
# Use 'init_host' to make it alive.")
if hasattr(klass_, '_parallel') and klass_._parallel:
new_actor = parallels.ActorParallel(url, klass_, obj)
lock = new_actor.get_lock()
self.locks[url] = lock
else:
new_actor = actor_module.Actor(url, klass_, obj)
obj.proxy = Proxy(new_actor)
self.__launch_actor(url, new_actor)
return Proxy(new_actor)
def has_actor(self, aid):
"""
Checks if the given id is used in the host by some actor.
:param str. aid: identifier of the actor to check.
:return: True if the id is used within the host.
"""
url = f'{self.transport}://{self.host_url.netloc}/{aid}'
return url in self.actors.keys()
def lookup(self, aid):
"""
Gets a new proxy that references to the actor of this host
(only actors in this host) identified by the given ID.
This method can be called remotely synchronously.
:param str. aid: identifier of the actor you want.
:return: :class:`~.Proxy` to the actor required.
:raises: :class:`NotFoundError` if the actor does not exist.
:raises: :class:`HostDownError` if the host is down.
"""
if not self.alive:
raise HostDownError()
url = f"{self.transport}://{self.host_url.netloc}/{aid}"
if url in self.actors.keys():
return Proxy(self.actors[url])
else:
raise NotFoundError(url)
def shutdown(self):
# """
# For internal calls.
# """
if self.alive:
print(f"Host {self.addr} :#: shutting down...")
for interval_event in self.intervals.values():
interval_event.set()
for actor in self.actors.values():
Proxy(actor).stop()
# stop the pool (close & join)
if self.ppool is not None:
if core_type == 'thread':
self.ppool.close()
self.ppool.join()
# By now, all pthreads should be gone
for parallel in self.pthreads.keys():
parallel.join()
for thread in self.threads.keys():
try:
thread.join()
except Exception as e:
print(e)
self.locks.clear()
self.actors.clear()
self.threads.clear()
self.pthreads.clear()
self.running = False
self.alive = False
del util.hosts[self.url]
if util.main_host.url == self.url:
util.main_host = (list(util.hosts.values())[0]
if util.hosts.values() else None)
print(f"Host {self.addr} :#: Bye!")
def stop_actor(self, aid):
"""
This method removes one actor from the Host, stopping it and deleting
all its references.
:param str. aid: identifier of the actor you want to stop.
"""
url = f"{self.transport}://{self.host_url.netloc}/{aid}"
if url != self.url:
a = self.actors[url]
Proxy(a).stop()
a.thread.join()
del self.actors[url]
del self.threads[a.thread]
def lookup_url(self, url, klass, module=None):
"""
Gets a proxy reference to the actor indicated by the URL in the
parameters. It can be a local reference or a remote direction to
another host.
This method can be called remotely synchronously.
:param srt. url: address that identifies an actor.
:param class klass: the class of the actor.
:param srt. module: if the actor class is not in the calling module,
you need to specify the module where it is here. Also, the *klass*
parameter change to be a string.
:return: :class:`~.Proxy` of the actor requested.
:raises: :class:`NotFoundError`, if the URL specified do not
correspond to any actor in the host.
:raises: :class:`HostDownError` if the host is down.
:raises: :class:`HostError` if there is an error looking for
the actor in another server.
"""
if not self.alive:
raise HostDownError()
aurl = urlparse(url)
if self.__is_local(aurl):
if url not in self.actors.keys():
raise NotFoundError(url)
else:
return Proxy(self.actors[url])
else:
try:
dispatcher = self.actors[aurl.scheme]
if module is not None:
try:
module_ = __import__(module, globals(), locals(),
[klass])
klass_ = getattr(module_, klass)
except Exception as e:
raise HostError("At lookup_url: " +
"Import failed for module " + module +
", class " + klass +
". Check this values for the lookup." +
" ERROR: " + str(e))
elif inspect.isclass(klass):
klass_ = klass
else:
raise HostError("The class specified to look up is" +
" not a class.")
remote_actor = actor_module.ActorRef(url, klass_,
dispatcher.channel)
return Proxy(remote_actor)
except HostError:
raise
except Exception as e:
raise HostError(
f"ERROR looking for the actor on another server. Hosts must"
f" be in http to work properly. {str(e)}")
def __is_local(self, aurl):
# '''Private method.
# Tells if the address given is from this host.
#
# :param ParseResult aurl: address to analyze.
# :return: (*Bool.*) If is local (**True**) or not (**False**).
# '''
return self.host_url.netloc == aurl.netloc
def __launch_actor(self, url, actor):
# '''Private method.
# This function makes an actor alive to start processing queries.
#
# :param str. url: identifier of the actor.
# :param Actor actor: instance of the actor.
# '''
actor.run()
self.actors[url] = actor
self.threads[actor.thread] = url
def __init_host(self):
# '''
# This method creates an actor for the Host so it can spawn actors
# remotely. Called always from the init function of the host, so
# no need for calling this directly.
# '''
if not self.running and self.alive:
self.id = self.url
host = actor_module.Actor(self.url, Host, self)
self.proxy = Proxy(host)
# self.actors[self.url] = host
self.__launch_actor(self.url, host)
# host.run()
# self.threads[host.thread] = self.url
self.running = True
def attach_interval(self, interval_id, interval_event):
"""Registers an interval event to the host."""
self.intervals[interval_id] = interval_event
def detach_interval(self, interval_id):
"""Deletes an interval event from the host registry."""
del self.intervals[interval_id]
def dumps(self, param):
"""
Checks the parameters generating new proxy instances to avoid
query concurrences from shared proxies and creating proxies for
actors from another host.
"""
if isinstance(param, Proxy):
module_name = param.actor.klass.__module__
if module_name == '__main__':
module_name = path.splitext(
path.basename(inspect.getfile(param.actor.klass)))[0]
return ProxyRef(param.actor.url, param.actor.klass.__name__,
module_name)
elif isinstance(param, list):
return [self.dumps(elem) for elem in param]
elif isinstance(param, dict):
new_dict = param
for key in new_dict.keys():
new_dict[key] = self.dumps(new_dict[key])
return new_dict
elif isinstance(param, tuple):
return tuple([self.dumps(elem) for elem in param])
else:
return param
def loads(self, param):
"""
Checks the return parameters generating new proxy instances to
avoid query concurrences from shared proxies and creating
proxies for actors from another host.
"""
if isinstance(param, ProxyRef):
try:
return self.lookup_url(param.url, param.klass, param.module)
except HostError:
print("Can't lookup for the actor received with the call.",
"It does not exist or the url is unreachable.",
param)
raise HostError(param)
elif isinstance(param, list):
return [self.loads(elem) for elem in param]
elif isinstance(param, tuple):
return tuple([self.loads(elem) for elem in param])
elif isinstance(param, dict):
new_dict = param
for key in new_dict.keys():
new_dict[key] = self.loads(new_dict[key])
return new_dict
else:
return param
def new_parallel(self, a_function, *params):
"""
Register a new thread executing a parallel method.
"""
# Create a pool if not created (threads or Gevent...)
if self.ppool is None:
if core_type == 'thread':
from multiprocessing.pool import ThreadPool
self.ppool = ThreadPool(500)
else:
from gevent.pool import Pool
self.ppool = Pool(500)
# Add the new task to the pool
self.ppool.apply_async(a_function, *params)
def shutdown(url=None):
"""
Stops the Host passed by parameter or all of them if none is
specified, stopping at the same time all its actors.
Should be called at the end of its usage, to finish correctly
all the connections and threads.
"""
if url is None:
for host in list(util.hosts.values()):
host.shutdown()
global core_type
core_type = None
else:
host = util.hosts[url]
host.shutdown()
def signal_handler(signal=None, frame=None):
# '''
# This gets the signal of Ctrl+C and stops the host. It also ends
# the execution. Needs the invocation of :meth:`serve_forever`.
#
# :param signal: SIGINT signal interruption sent with a Ctrl+C.
# :param frame: the current stack frame. (not used)
# '''
print("You pressed Ctrl+C!")
util.main_host.serving = False
shutdown(util.main_host.url)
def serve_forever():
"""
This allows the host (main host) to keep alive indefinitely so its actors
can receive queries at any time.
The main thread stays blocked forever.
To kill the execution, press Ctrl+C.
See usage example in :ref:`sample6`.
"""
if not util.main_host.alive:
raise Exception("This host is already shut down.")
util.main_host.serving = True
signal.signal(SIGINT, signal_handler)
print("Press Ctrl+C to kill the execution")
while util.main_host is not None and util.main_host.serving:
try:
sleep(1)
except Exception:
pass
print("BYE!")
def interval(host, time, actor, method, *args, **kwargs):
"""
Creates an Event attached to the host for management that will
execute the *method* of the *actor* every *time* seconds.
See example in :ref:`sample_inter`
:rtype:
:param Proxy host: host that will manage the interval, commonly the
host of the actor.
:param float time: seconds for the intervals.
:param Proxy actor: actor to which make the call every *time* seconds.
:param Str. method: method of the *actor* to be called.
:param list args: arguments for *method*.
:return: :class:`Event` instance of the interval.
"""
call = getattr(actor, method, None)
if not callable(call):
raise IntervalError(
f"The actor {actor.get_id()} does not have the method {method}.")
if call.__class__.__name__ in ["TellWrapper", "TellRefWrapper"]:
# If the method is a normal tell, the interval thread can send
# the calls normally.
# It it is a Ref Tell, the proxies in the args would be parsed
# during the call to this very method. So the call can be made
# as a normal Tell. The actor will do the loads normally on the
# receive as it has its methods marked as ref.
if call.__class__.__name__ is "TellRefWrapper":
call.__call__ = TellWrapper.__call__
return intervals.interval_host(host, time, call, *args, **kwargs)
else:
raise IntervalError("The callable for the interval must be a tell" +
" method of the actor.")
def later(timeout, actor, method, *args, **kwargs):
"""
Sets a timer that will call the *method* of the *actor* past *timeout*
seconds.
See example in :ref:`sample_inter`
:param int timeout: seconds until the method is called.
:param Proxy actor: actor to which make the call after *time* seconds.
:param Str. method: method of the *actor* to be called.
:param list args: arguments for *method*.
:return: manager of the later (Timer in thread,
Greenlet in green_thread)
"""
call = getattr(actor, method, None)
if not callable(call):
raise IntervalError(f"later: The actor {actor.get_id()} does not "
f"have the method {method}.")
if call.__class__.__name__ in ["TellWrapper", "TellRefWrapper"]:
# As with the interval, args have already been dumped.
if call.__class__.__name__ is "TellRefWrapper":
call.__call__ = TellWrapper.__call__
return intervals.later(timeout, call, *args, **kwargs)
else:
raise IntervalError("The callable for the later must be a tell "
"method of the actor.")
def sleep(seconds):
"""
Facade for the sleep function. Do not use time.sleep if you are
running green threads.
"""
intervals.sleep(seconds)
|
Proxy¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 | from importlib import import_module
from queue import Empty
from .exceptions import PyActorTimeoutError, HostError
from .util import ASK, TELL, TYPE, METHOD, PARAMS, CHANNEL, TO, RESULT
from .util import get_host, get_lock, get_current
actor_channel = None
future_module = None
def set_actor(module_name):
global actor_channel
actor_channel = import_module('.' + module_name + '.channel', __package__)
global future_module
future_module = import_module('.' + module_name + '.future', __package__)
class ProxyRef(object):
def __init__(self, actor, class_, module):
self.url = actor
self.klass = class_
self.module = module
def __repr__(self):
return f"ProxyRef(actor={self.url}, class={self.klass} " \
f"mod={self.module})"
class Proxy(object):
"""
Proxy is the class that supports to create a remote reference to an
actor and invoke its methods. All the references to actors will be
proxies, even the host.
To get a proxy to an Actor, you should use one of the host functions
that provide one, like :meth:`~.spawn` or :meth:`~.lookup_url`.
:param Actor actor: the actor the proxy will manage.
"""
def __init__(self, actor):
self.__channel = actor.channel
self.actor = actor
self.__lock = get_lock()
for method in actor.ask_ref:
setattr(self, method, AskRefWrapper(self.__channel, method,
actor.url))
for method in actor.tell_ref:
setattr(self, method, TellRefWrapper(self.__channel, method,
actor.url))
for method in actor.tell:
setattr(self, method, TellWrapper(self.__channel, method,
actor.url))
for method in actor.ask:
setattr(self, method, AskWrapper(self.__channel, method,
actor.url))
def __repr__(self):
return f"Proxy(actor={self.actor}, tell={self.actor.tell}" \
f" ref={self.actor.tell_ref}, ask={self.actor.ask}" \
f" ref={self.actor.ask_ref})"
def __str__(self):
return f"{self.actor}'s proxy"
def __eq__(self, other):
if isinstance(other, self.__class__):
return self.actor.url == other.actor.url
return NotImplemented
def __ne__(self, other):
if isinstance(other, self.__class__):
return not self == other
return NotImplemented
def __hash__(self):
return hash(self.actor.url)
def get_id(self):
"""
:return: the id of the actor that this proxy holds.
:raises: Exception if the proxy holds a remote actor. Use URL.
"""
try:
return self.actor.id
except AttributeError:
raise Exception("This proxy holds a remote actor." +
" Use the url instead of the id.")
def get_url(self):
"""
:return: the URL of the actor that this proxy holds.
"""
return self.actor.url
class TellWrapper(object):
"""
Wrapper for Tell type queries to the proxy. Creates the request and
sends it through the channel.
:param Channel channel: communication way for the query.
:param str. method: name of the method this query is going to invoke.
:param str. actor_url: URL address where the actor is set.
"""
def __init__(self, channel, method, actor_url):
self.__channel = channel
self.__method = method
self.__target = actor_url
def __call__(self, *args, **kwargs):
# SENDING MESSAGE TELL
# msg = TellRequest(TELL, self.__method, args, self.__target)
msg = {TYPE: TELL, METHOD: self.__method, PARAMS: (args, kwargs),
TO: self.__target}
self.__channel.send(msg)
class AskWrapper(object):
"""
Wrapper for Ask type queries to the proxy. Calling it blocks the
execution until the result is returned or timeout is reached. You
can add the tagged parameter "timeout" to change the time limit to
wait. Default timeout is set to 10s. It is also possible to specify
"future=True" to get an instant response with a :class:`Future`
object with which you can manage the result.
:param Channel channel: communication way for the query.
:param str. method: name of the method this query is gonna invoke.
:param str. actor_url: URL address where the actor is set.
"""
def __init__(self, channel, method, actor_url):
self._actor_channel = channel
self._method = method
self.target = actor_url
def __call__(self, *args, **kwargs):
if 'future' in kwargs.keys():
future = kwargs['future']
del kwargs['future']
else:
future = False
self.__lock = get_lock()
if not future:
self.__channel = actor_channel.Channel()
if 'timeout' in kwargs.keys():
timeout = kwargs['timeout']
del kwargs['timeout']
else:
timeout = 10
# SENDING MESSAGE ASK
# msg = AskRequest(ASK, self._method, args, self.__channel,
# self.target)
msg = {TYPE: ASK, METHOD: self._method, PARAMS: (args, kwargs),
CHANNEL: self.__channel, TO: self.target}
self._actor_channel.send(msg)
if self.__lock is not None:
self.__lock.release()
try:
response = self.__channel.receive(timeout)
result = response[RESULT]
except Empty:
if self.__lock is not None:
self.__lock.acquire()
raise PyActorTimeoutError(self._method)
if self.__lock is not None:
self.__lock.acquire()
if isinstance(result, Exception):
raise result
else:
return result
else:
future_ref = {METHOD: self._method, PARAMS: (args, kwargs),
CHANNEL: self._actor_channel, TO: self.target,
'LOCK': self.__lock}
manager = get_current()
if manager is None:
manager = get_host().proxy.actor
return manager.future_manager.new_future(future_ref)
class AskRefWrapper(AskWrapper):
"""
Wrapper for Ask queries that have a proxy in parameters or returns.
"""
def __call__(self, *args, **kwargs):
if 'future' in kwargs.keys():
future = kwargs['future']
del kwargs['future']
else:
future = False
host = get_host()
if host is not None:
new_args = host.dumps(list(args))
new_kwargs = host.dumps(kwargs)
else:
raise HostError("No such Host on the context of the call.")
if future:
self.__lock = get_lock()
future_ref = {METHOD: self._method, PARAMS: (new_args, new_kwargs),
CHANNEL: self._actor_channel, TO: self.target,
'LOCK': self.__lock}
manager = get_current()
if manager is None:
manager = get_host().proxy.actor
return manager.future_manager.new_future(future_ref, ref=True)
else:
result = super(AskRefWrapper, self).__call__(*new_args,
**new_kwargs)
return get_host().loads(result)
class TellRefWrapper(TellWrapper):
"""Wrapper for Tell queries that have a proxy in parameters."""
def __call__(self, *args, **kwargs):
host = get_host()
if host is not None:
new_args = host.dumps(list(args))
new_kwargs = host.dumps(kwargs)
else:
raise HostError("No such Host on the context of the call.")
return super(TellRefWrapper, self).__call__(*new_args, **new_kwargs)
|
XMLRPC Server¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | import pickle
import threading
import xmlrpc.client
from xmlrpc.server import SimpleXMLRPCRequestHandler
from xmlrpc.server import SimpleXMLRPCServer
class RequestHandler(SimpleXMLRPCRequestHandler):
rpc_paths = ()
class Source(threading.Thread):
"""
Facade for simple remote communication using XMLRPCServer.
"""
def __init__(self, addr):
threading.Thread.__init__(self)
ip, port = addr
self.addr = addr
self.server = SimpleXMLRPCServer((ip, port),
requestHandler=RequestHandler,
logRequests=False,
allow_none=True)
# self.server.register_introspection_functions()
def register_function(self, func):
self.server.register_function(func, 'send')
def run(self):
self.server.serve_forever()
def stop(self):
self.server.shutdown()
self.server.server_close()
class Sink(object):
"""
Facade for XMLRPC proxies.
"""
def __init__(self, url):
self.endpoint = xmlrpc.client.ServerProxy(url)
def send(self, msg):
msg = pickle.dumps(msg)
return self.endpoint.send(msg)
|
RabbitMQ Server¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | import pika
import threading
import pickle
from urllib.parse import urlparse
from pyactor.util import RABBIT_USER, RABBIT_PASS
class Source(threading.Thread):
"""
Facade for simple remote communication using RabbitMQ.
This connection uses by default the guest RabbitMQ user. To change
credentials see :func:`~.setRabbitCredentials`.
"""
def __init__(self, addr):
threading.Thread.__init__(self)
ip, port = addr
self.url = ip + '/' + str(port)
credentials = pika.PlainCredentials(RABBIT_USER, RABBIT_PASS)
params = pika.ConnectionParameters(host=ip, credentials=credentials)
self.connection = pika.BlockingConnection(params)
self.channel = self.connection.channel()
self.channel.queue_declare(queue=self.url)
# self.channel.basic_qos(prefetch_count=1)
self.on_message = None
def register_function(self, func):
self.on_message = func
self.channel.basic_consume(self.url, self.on_request,
exclusive=True)
def run(self):
self.channel.start_consuming()
def stop(self):
self.channel.queue_delete(queue=self.url)
self.channel.close()
self.connection.close()
def on_request(self, ch, method, props, body):
self.on_message(body)
ch.basic_ack(delivery_tag=method.delivery_tag)
class Sink(object):
"""
Facade for RabbitMQ concrete connexions to remote actors.
This manages the publish to queues.
"""
def __init__(self, url):
aurl = urlparse(url)
address = aurl.netloc.split(':')
ip, port = address[0], int(address[1])
self.url = ip + '/' + str(port)
credentials = pika.PlainCredentials(RABBIT_USER, RABBIT_PASS)
params = pika.ConnectionParameters(host=ip, credentials=credentials)
self.connection = pika.BlockingConnection(params)
self.channel = self.connection.channel()
def send(self, msg):
msg = pickle.dumps(msg)
self.channel.basic_publish(exchange='',
routing_key=self.url,
body=msg)
|
Thread Actor¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | from copy import copy
from threading import Thread
from .channel import Channel
from .future import FutureManager
from ..util import ASK, TELL, FUTURE, TYPE, ASK_RESPONSE, FUTURE_RESPONSE
from ..util import METHOD, PARAMS, RESULT, CHANNEL, RPC_ID
from ..util import ref_l, ref_d
class ActorRef(object):
"""
ActorRef contains the main components of an actor. These are the
URL where it is located, the communication :class:`~.Channel` and
the class of the actor as also the synchronous and asynchronous
methods the class implements. When no channel is specified a new
one will be created which is also the default procedure.
.. note:: This is a superclass of :py:class:`Actor` and has no
direct functionality.
"""
def __init__(self, url, klass, channel=None):
self.url = url
self.tell = set()
self.ask = set()
self.klass = klass
if channel:
self.channel = channel
else:
self.channel = Channel()
if hasattr(klass, '_tell') and klass._tell:
self.tell = copy(klass._tell)
if hasattr(klass, '_ask') and klass._ask:
self.ask = copy(klass._ask)
if hasattr(klass, '_ref'):
self.receive = ref_l(self, self.receive)
self.send_response = ref_d(self, self.send_response)
self.tell_ref = self.tell & klass._ref
self.ask_ref = self.ask & klass._ref
for method in self.ask_ref:
self.ask.remove(method)
for method in self.tell_ref:
self.tell.remove(method)
else:
self.ask_ref = set()
self.tell_ref = set()
self.tell.add('stop')
def receive(self, msg):
raise NotImplementedError()
def send_response(self, result, msg):
raise NotImplementedError()
@property
def _ref(self):
return self.tell_ref | self.ask_ref
def __str__(self):
return f"Actor {self.url} ({self.klass.__name__})"
def __repr__(self):
return f"Actor(url={self.url}, class={self.klass})"
class Actor(ActorRef):
"""
Actor is the instance of an object to which is possible to access
and invoke its methods remotely. Main element of the model. The
host is the one to create them (spawning -> see :meth:`~.spawn`).
:param str. url: URL where the actor is running.
:param class klass: class type for the actor.
:param klass obj: instance of the *klass* class to attach to the
actor.
"""
def __init__(self, url, klass, obj):
super(Actor, self).__init__(url, klass)
self._obj = obj
self.id = obj.id
self.running = True
self.thread = None
self.future_manager = FutureManager()
def __process_queue(self):
while self.running:
message = self.channel.receive()
self.receive(message)
def is_alive(self):
"""
:return: (*bool.*) identifies the current state of the actor.
**True** if it is running.
"""
return self.running
def receive(self, msg):
"""
The message received from the queue specifies a method of the
class the actor represents. This invokes it. If the
communication is an ASK, sends the result back
to the channel included in the message as an ASK_RESPONSE.
If it is a FUTURE, generates a FUTURE_RESPONSE
to send the result to the manager.
:param msg: The message is a dictionary using the constants
defined in util.py (:mod:`pyactor.util`).
"""
if msg[TYPE] == TELL and msg[METHOD] == 'stop':
self.running = False
self.future_manager.stop()
else:
try:
invoke = getattr(self._obj, msg[METHOD])
params = msg[PARAMS]
result = invoke(*params[0], **params[1])
except Exception as e:
if msg[TYPE] == TELL:
print(e)
return
result = e
self.send_response(result, msg)
def send_response(self, result, msg):
if msg[TYPE] == ASK:
response = {TYPE: ASK_RESPONSE, RESULT: result,
RPC_ID: msg[RPC_ID] if RPC_ID in msg.keys() else None}
msg[CHANNEL].send(response)
elif msg[TYPE] == FUTURE:
response = {TYPE: FUTURE_RESPONSE, RPC_ID: msg[RPC_ID],
RESULT: result}
msg[CHANNEL].send(response)
def run(self):
"""
Creates the actor thread which will process the channel queue
while the actor :meth:`is_alive`, making it able to receive
queries.
"""
self.thread = Thread(target=self.__process_queue)
self.thread.start()
|
Thread Intervals¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | import time as timep
from threading import Thread, Timer, Event
def sleep(time):
"""
Facade for the sleep function. Avoid using time.sleep.
:param int time: time to sleep, in seconds. (Float for second
divisions)
"""
timep.sleep(time)
def later(timeout, f, *args, **kwargs):
"""
Sets a timer that will call the *f* function past *timeout* seconds.
See example in :ref:`sample_inter`
:return: :class:`Timer`
"""
if kwargs is None:
kwargs = {}
if args is None:
args = []
t = Timer(timeout, f, args, kwargs)
t.start()
return t
def interval_host(host, time, f, *args, **kwargs):
"""
Creates an Event attached to the *host* that will execute the *f*
function every *time* seconds.
See example in :ref:`sample_inter`
:param Proxy host: host proxy. Can be obtained from inside a
class with ``self.host``.
:param int time: seconds for the intervals.
:param func f: function to be called every *time* seconds.
:param list args: arguments for *f*.
:return: :class:`Event` instance of the interval.
"""
def wrap(*args, **kwargs):
# thread = currentThread()
args = list(args)
stop_event = args[0]
del args[0]
args = tuple(args)
while not stop_event.is_set():
f(*args, **kwargs)
stop_event.wait(time)
host.detach_interval(thread_id)
t2_stop = Event()
args = list(args)
args.insert(0, t2_stop)
args = tuple(args)
t = Thread(target=wrap, args=args, kwargs=kwargs)
t.start()
thread_id = t.getName()
host.attach_interval(thread_id, t2_stop)
return t2_stop
|
Thread Parallel¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | import uuid
from threading import Lock, current_thread
from time import sleep
from .actor import Actor
from ..util import get_host, METHOD, PARAMS, TYPE, TELL
class ActorParallel(Actor):
"""
Actor with parallel methods. Parallel methods are invoked in new
threads, so their invocation do not block the actor allowing it to
process many queries at a time.
To avoid concurrence problems, this actors use Locks to guarantee
its correct state.
"""
def __init__(self, url, klass, obj):
super(ActorParallel, self).__init__(url, klass, obj)
self.__lock = Lock()
self.pending = {}
self.ask_parallel = (self.ask | self.ask_ref) & klass._parallel
self.tell_parallel = (self.tell | self.tell_ref) & klass._parallel
for method in self.ask_parallel:
setattr(self._obj, method,
ParallelAskWrapper(getattr(self._obj, method), self,
self.__lock))
for method in self.tell_parallel:
setattr(self._obj, method,
ParallelTellWrapper(getattr(self._obj, method), self,
self.__lock))
def receive(self, msg):
"""
Overwriting :meth:`Actor.receive`. Adds the checks and
features required by parallel methods.
:param msg: The message is a dictionary using the constants
defined in util.py (:mod:`pyactor.util`).
"""
if msg[TYPE] == TELL and msg[METHOD] == 'stop':
self.running = False
else:
try:
invoke = getattr(self._obj, msg[METHOD])
params = msg[PARAMS]
if msg[METHOD] in self.ask_parallel:
rpc_id = str(uuid.uuid4())
# add rpc message to pendent AskResponse s
self.pending[rpc_id] = msg
# insert an rpc id to args
para = list(params[0])
para.insert(0, rpc_id)
invoke(*para, **params[1])
return
else:
with self.__lock:
sleep(0.001)
result = invoke(*params[0], **params[1])
except Exception as e:
result = e
print(result)
self.send_response(result, msg)
def receive_from_ask(self, result, rpc_id):
msg = self.pending[rpc_id]
del self.pending[rpc_id]
self.send_response(result, msg)
def get_lock(self):
"""
:return: :class:`Lock` of the actor.
"""
return self.__lock
class ParallelAskWrapper(object):
"""Wrapper for ask methods that have to be called in a parallel way."""
def __init__(self, method, actor, lock):
self.__method = method
self.__actor = actor
self.__lock = lock
def __call__(self, *args, **kwargs):
args = list(args)
rpc_id = args[0]
del args[0]
args = tuple(args)
self.host = get_host()
param = (self.__method, rpc_id, args, kwargs)
self.host.new_parallel(self.invoke, param)
def invoke(self, func, rpc_id, args, kwargs):
# put the process in the host list pthreads
self.host.pthreads[current_thread()] = self.__actor.url
with self.__lock:
sleep(0.001)
try:
result = func(*args, **kwargs)
except Exception as e:
result = e
self.__actor.receive_from_ask(result, rpc_id)
# remove the process from pthreads
del self.host.pthreads[current_thread()]
class ParallelTellWrapper(object):
"""
Wrapper for tell methods that have to be called in a parallel way.
"""
def __init__(self, method, actor, lock):
self.__method = method
self.__actor = actor
self.__lock = lock
def __call__(self, *args, **kwargs):
self.host = get_host()
param = (self.__method, args, kwargs)
self.host.new_parallel(self.invoke, param)
def invoke(self, func, args, kwargs):
self.host.pthreads[current_thread()] = self.__actor.url
with self.__lock:
sleep(0.001)
func(*args, **kwargs)
del self.host.pthreads[current_thread()]
|
Thread Future¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 | import uuid
from threading import Condition, Thread
from .channel import Channel
from ..exceptions import PyActorTimeoutError, FutureError
from ..util import TELL, FUTURE, TYPE, METHOD, PARAMS, CHANNEL, TO
from ..util import get_current, get_host, get_lock, RPC_ID, RESULT
PENDING = 'PENDING'
RUNNING = 'RUNNING'
FINISHED = 'FINISHED'
class Future(object):
"""
Container for the result of an ask query sent asynchronously which
could not be resolved yet.
:param str. fid: future ID.
"""
def __init__(self, fid, future_ref, manager_channel):
self.__condition = Condition()
self.__state = PENDING
self.__result = None
self.__exception = None
self.__callbacks = []
self.__method = future_ref[METHOD]
self.__params = future_ref[PARAMS]
self.__actor_channel = future_ref[CHANNEL]
self.__target = future_ref[TO]
self.__channel = manager_channel
self.__id = fid
def _invoke_callbacks(self):
for callback in self.__callbacks:
try:
# msg = TellRequest(TELL, callback[0], [self], callback[2])
msg = {TYPE: TELL, METHOD: callback[0], PARAMS: ([self], {}),
TO: callback[2]}
callback[1].send(msg)
except Exception as e:
raise FutureError(
f"Exception calling callback for {self!r}: {e!r}")
def running(self):
"""Return True if the future is currently executing."""
with self.__condition:
return self.__state == RUNNING
def done(self):
"""Return True if the future finished executing."""
with self.__condition:
return self.__state == FINISHED
def __get__result(self):
if self.__exception is not None:
raise self.__exception
else:
return self.__result
def add_callback(self, method):
"""
Attaches a method that will be called when the future finishes.
:param method: A callable from an actor that will be called
when the future completes. The only argument for that
method must be the future itself from which you can get the
result though `future.:meth:`result()``. If the future has
already completed, then the callable will be called
immediately.
.. note:: This functionality only works when called from an actor,
specifying a method from the same actor.
"""
from_actor = get_current()
if from_actor is not None:
callback = (method, from_actor.channel, from_actor.url)
with self.__condition:
if self.__state is not FINISHED:
self.__callbacks.append(callback)
return
# Invoke the callback directly
# msg = TellRequest(TELL, method, [self], from_actor.url)
msg = {TYPE: TELL, METHOD: method, PARAMS: ([self], {}),
TO: from_actor.url}
from_actor.channel.send(msg)
else:
raise FutureError("add_callback only works when called " +
"from inside an actor")
def result(self, timeout=None):
"""
Returns the result of the call that the future represents.
:param timeout: The number of seconds to wait for the result
if the future has not been completed. None, the default,
sets no limit.
:returns: The result of the call that the future represents.
:raises: TimeoutError: If the timeout is reached before the
future ends execution.
:raises: Exception: If the call raises the Exception.
"""
with self.__condition:
if self.__state == FINISHED:
return self.__get__result()
lock = get_lock()
if lock is not None:
lock.release()
self.__condition.wait(timeout)
if lock is not None:
lock.acquire()
if self.__state == FINISHED:
return self.__get__result()
else:
raise PyActorTimeoutError(f"Future: {self.__method!r}")
def exception(self, timeout=None):
"""
Return a exception raised by the call that the future
represents.
:param timeout: The number of seconds to wait for the exception
if the future has not been completed. None, the default,
sets no limit.
:returns: The exception raised by the call that the future
represents or None if the call completed without raising.
:raises: TimeoutError: If the timeout is reached before the
future ends execution.
"""
with self.__condition:
if self.__state == FINISHED:
return self.__exception
lock = get_lock()
if lock is not None:
lock.release()
self.__condition.wait(timeout)
if lock is not None:
lock.acquire()
if self.__state == FINISHED:
return self.__exception
else:
raise PyActorTimeoutError(f"Future: {self.__method!r}")
def send_work(self):
"""
Sends the query to the actor for it to start executing the work.
It is possible to execute once again a future that has finished
if necessary (overwriting the results), but only one execution
at a time.
"""
if self.__set_running():
# msg = FutureRequest(FUTURE, self.__method, self.__params,
# self.__channel, self.__target, self.__id)
msg = {TYPE: FUTURE, METHOD: self.__method, PARAMS: self.__params,
CHANNEL: self.__channel, TO: self.__target,
RPC_ID: self.__id}
self.__actor_channel.send(msg)
else:
raise FutureError("Future already running.")
def __set_running(self):
# """This is only called internally from send_work().
# It marks the future as running or returns false if it
# already was running."""
with self.__condition:
if self.__state in [PENDING, FINISHED]:
self.__state = RUNNING
return True
elif self.__state == RUNNING:
return False
def set_result(self, result):
"""
Sets the return value of work associated with the future.
Only called internally.
"""
with self.__condition:
self.__result = result
self.__state = FINISHED
self.__condition.notify_all()
self._invoke_callbacks()
def set_exception(self, exception):
"""
Sets the result of the future as being the given exception.
Only called internally.
"""
with self.__condition:
self.__exception = exception
self.__state = FINISHED
self.__condition.notify_all()
self._invoke_callbacks()
class FutureRef(Future):
def result(self, timeout=None):
"""
Returns the result of the call that the future represents.
:param timeout: The number of seconds to wait for the result
if the future has not been completed. None, the default,
sets no limit.
:returns: The result of the call that the future represents.
:raises: TimeoutError: If the timeout is reached before the
future ends execution.
:raises: Exception: If the call raises the Exception.
"""
result = super(FutureRef, self).result(timeout)
return get_host().loads(result)
class FutureManager(object):
"""
A manager that controls the creation and execution of the futures in a host.
"""
def __init__(self):
self.running = False
self.channel = Channel()
self.futures = {}
self.t = None
def __queue_management(self):
self.running = True
while self.running:
response = self.channel.receive()
if response == 'stop':
self.running = False
else:
result = response[RESULT]
future = self.futures[response[RPC_ID]]
if isinstance(result, Exception):
future.set_exception(result)
else:
future.set_result(result)
def new_future(self, future_ref, ref=False):
future_id = str(uuid.uuid4())
if not ref:
future = Future(future_id, future_ref, self.channel)
else:
future = FutureRef(future_id, future_ref, self.channel)
future.send_work()
self.futures[future_id] = future
if not self.running:
self.t = Thread(target=self.__queue_management)
self.t.start()
return future
def stop(self):
self.channel.send('stop')
if self.t is not None:
self.t.join()
self.t = None
self.futures = {}
|
Thread Dispatcher¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | import uuid
import pickle
import traceback
from urllib.parse import urlparse
from importlib import import_module
from .actor import Actor
from .channel import Channel
from ..util import FUTURE, ASK_RESPONSE, FUTURE_RESPONSE
from ..util import TYPE, METHOD, TELL, ASK, CHANNEL, FROM, TO, RPC_ID
class RPCDispatcher(Actor):
"""
This is the actor that will manage remote sends and receives
with other hosts. Each host has one, configured depending on
the scheme specified when created.
"""
def __init__(self, url, host, mode):
self.server_model = import_module('pyactor.' + mode + 'server')
self.url = url
self.host = host
aurl = urlparse(url)
address = aurl.netloc.split(':')
ip, port = address[0], address[1]
self.source = self.server_model.Source((ip, int(port)))
self.source.register_function(self.on_message)
self.source.start()
self.running = True
self.channel = Channel()
self.pending = {} # Sent to another host
self.executing = {} # Waiting for the response in this server
self.tell = ['stop']
self.ask = []
self.ask_ref = []
self.tell_ref = []
self.sinks = {}
def get_sink(self, url):
if url in self.sinks.keys():
return self.sinks[url]
else:
self.sinks[url] = self.server_model.Sink(url)
return self.sinks[url]
def receive(self, msg):
if msg[TYPE] == TELL and msg[METHOD] == 'stop':
self.running = False
self.source.stop()
else:
try:
if msg[TYPE] == TELL:
self.get_sink(msg[TO]).send(msg)
elif msg[TYPE] == ASK:
rpc_id = str(uuid.uuid4())
msg[RPC_ID] = rpc_id
self.pending[rpc_id] = msg[CHANNEL]
del msg[CHANNEL]
msg[FROM] = self.url
self.get_sink(msg[TO]).send(msg)
elif msg[TYPE] == ASK_RESPONSE or msg[TYPE] == FUTURE_RESPONSE:
try:
if msg[RPC_ID] in self.executing.keys():
sink = self.get_sink(self.executing[msg[RPC_ID]])
sink.send(msg)
del self.executing[msg[RPC_ID]]
except TypeError as p:
print("Pickle ERR: impossible to marshall a return." +
" Returning a Proxy without the method in " +
f"_ref? {p}")
except Exception as e:
print(("Error sending a response to {!r}. "
.format(self.executing[msg[RPC_ID]])) + str(e))
del self.executing[msg[RPC_ID]]
elif msg[TYPE] == FUTURE:
rpc_id = msg[RPC_ID]
self.pending[rpc_id] = msg[CHANNEL]
del msg[CHANNEL]
msg[FROM] = self.url
self.get_sink(msg[TO]).send(msg)
except TypeError as p:
print("Pickle ERROR: impossible to marshall a parameter." +
f"Passing a Proxy without the method in _ref? {p}")
except Exception as e:
print(e)
def on_message(self, msg):
try:
msg = pickle.loads(msg.data)
if msg[TYPE] == TELL:
self.host.actors[msg[TO]].channel.send(msg)
elif msg[TYPE] == ASK or msg[TYPE] == FUTURE:
# Save rpc id and actor channel
rpc_id = msg[RPC_ID]
self.executing[rpc_id] = msg[FROM]
# Change msg callback channel, add id
msg[CHANNEL] = self.channel
self.host.actors[msg[TO]].channel.send(msg)
elif msg[TYPE] == ASK_RESPONSE or msg[TYPE] == FUTURE_RESPONSE:
if msg[RPC_ID] in self.pending.keys():
self.pending[msg[RPC_ID]].send(msg)
del self.pending[msg[RPC_ID]]
except KeyError as ke:
print("ERROR: The actor", ke, "is offline.")
except Exception as e:
print(f"{self.url} :#: Connection ERROR: {e}")
traceback.print_exc()
|
Green Thread Actor¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | from copy import copy
from gevent import spawn
from .channel import Channel
from .future import FutureManager
from ..util import ASK, TELL, FUTURE, TYPE, ASK_RESPONSE, FUTURE_RESPONSE
from ..util import METHOD, PARAMS, RESULT, CHANNEL, RPC_ID
from ..util import ref_l, ref_d
class ActorRef(object):
"""
ActorRef contains the main components of an actor. These are the
URL where it is located, the communication :class:`~.Channel` and
the class of the actor as also the synchronous and asynchronous
methods the class implements. When no channel is specified a new
one will be created which is also the default procedure.
.. note:: This is a superclass of :py:class:`Actor` and has no
direct functionality.
"""
def __init__(self, url, klass, channel=None):
self.url = url
self.tell = set()
self.ask = set()
self.klass = klass
if channel:
self.channel = channel
else:
self.channel = Channel()
if hasattr(klass, '_tell') and klass._tell:
self.tell = copy(klass._tell)
if hasattr(klass, '_ask') and klass._ask:
self.ask = copy(klass._ask)
if hasattr(klass, '_ref'):
self.receive = ref_l(self, self.receive)
self.send_response = ref_d(self, self.send_response)
self.tell_ref = self.tell & klass._ref
self.ask_ref = self.ask & klass._ref
for method in self.ask_ref:
self.ask.remove(method)
for method in self.tell_ref:
self.tell.remove(method)
else:
self.ask_ref = set()
self.tell_ref = set()
self.tell.add('stop')
def receive(self, msg):
raise NotImplementedError()
def send_response(self, result, msg):
raise NotImplementedError()
@property
def _ref(self):
return self.tell_ref | self.ask_ref
def __str__(self):
return f"Actor {self.url} ({self.klass.__name__})"
def __repr__(self):
return f"Actor(url={self.url}, class={self.klass})"
class Actor(ActorRef):
"""
Actor is the instance of an object to which is possible to access
and invoke its methods remotely. Main element of the model. The
host is the one to create them (spawning -> see :meth:`~.spawn`).
:param str. url: URL where the actor is running.
:param class klass: class type for the actor.
:param klass obj: instance of the *klass* class to attach to the
actor.
"""
def __init__(self, url, klass, obj):
super(Actor, self).__init__(url, klass)
self._obj = obj
self.id = obj.id
self.running = True
self.thread = None
self.future_manager = FutureManager()
def __process_queue(self):
while self.running:
message = self.channel.receive()
self.receive(message)
def is_alive(self):
"""
:return: (*bool.*) identifies the current state of the actor.
**True** if it is running.
"""
return self.running
def receive(self, msg):
"""
The message received from the queue specifies a method of the
class the actor represents. This invokes it. If the
communication is an ASK, sends the result back
to the channel included in the message as an ASK_RESPONSE.
If it is a FUTURE, generates a FUTURE_RESPONSE
to send the result to the manager.
:param msg: The message is a dictionary using the constants
defined in util.py (:mod:`pyactor.util`).
"""
if msg[TYPE] == TELL and msg[METHOD] == 'stop':
self.running = False
self.future_manager.stop()
else:
try:
invoke = getattr(self._obj, msg[METHOD])
params = msg[PARAMS]
result = invoke(*params[0], **params[1])
except Exception as e:
if msg[TYPE] == TELL:
print(e)
return
result = e
self.send_response(result, msg)
def send_response(self, result, msg):
if msg[TYPE] == ASK:
response = {TYPE: ASK_RESPONSE, RESULT: result,
RPC_ID: msg[RPC_ID] if RPC_ID in msg.keys() else None}
msg[CHANNEL].send(response)
elif msg[TYPE] == FUTURE:
response = {TYPE: FUTURE_RESPONSE, RPC_ID: msg[RPC_ID],
RESULT: result}
msg[CHANNEL].send(response)
def run(self):
"""
Creates the actor thread which will process the channel queue
while the actor :meth:`is_alive`, making it able to receive
queries.
"""
self.thread = spawn(self.__process_queue)
|
Grenn Thread Intervals¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | from gevent.event import Event
from gevent import spawn
from gevent import sleep as gsleep
def sleep(seconds):
"""
Facade for the sleep function. Do not use time.sleep if you are
running green threads.
:param int time: time to sleep, in seconds. (Float for second
divisions)
"""
gsleep(seconds)
def later(timeout, f, *args, **kwargs):
"""
Sets a timer that will call the *f* function past *timeout* seconds.
See example in :ref:`sample_inter`
:return: :class:`Greenlet` new 'thread' which will perform the call
when specified.
"""
def wrap(*args, **kwargs):
sleep(timeout)
return f(*args, **kwargs)
return spawn(wrap, *args, **kwargs)
def interval_host(host, time, f, *args, **kwargs):
"""
Creates an Event attached to the *host* that will execute the *f*
function every *time* seconds.
See example in :ref:`sample_inter`
:param Proxy host: host proxy. Can be obtained from inside a
class with ``self.host``.
:param int time: seconds for the intervals.
:param func f: function to be called every *time* seconds.
:param list args: arguments for *f*.
:return: :class:`Event` instance of the interval.
"""
def wrap(*args, **kwargs):
# thread = getcurrent()
args = list(args)
stop_event = args[0]
del args[0]
args = tuple(args)
while not stop_event.is_set():
f(*args, **kwargs)
stop_event.wait(time)
host.detach_interval(thread_id)
t2_stop = Event()
args = list(args)
args.insert(0, t2_stop)
args = tuple(args)
t = spawn(wrap, *args, **kwargs)
thread_id = t
host.attach_interval(thread_id, t2_stop)
return t2_stop
|
Green Thread Parallel¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | import uuid
from gevent import getcurrent
from .actor import Actor
from ..util import get_host, METHOD, PARAMS, TYPE, TELL
class ActorParallel(Actor):
"""
Actor with parallel methods. Parallel methods are invoked in new
threads, so their invocation do not block the actor allowing it to
process many queries at a time.
Green threads do not have concurrence problems so no need to use
Locks in this implementation.
"""
def __init__(self, url, klass, obj):
super(ActorParallel, self).__init__(url, klass, obj)
self.pending = {}
self.ask_parallel = (self.ask | self.ask_ref) & klass._parallel
self.tell_parallel = (self.tell | self.tell_ref) & klass._parallel
for method in self.ask_parallel:
setattr(self._obj, method,
ParallelAskWrapper(getattr(self._obj, method), self))
for method in self.tell_parallel:
setattr(self._obj, method,
ParallelTellWrapper(getattr(self._obj, method), self))
def receive(self, msg):
"""
Overwriting :meth:`Actor.receive`. Adds the checks and
features required by parallel methods.
:param msg: The message is a dictionary using the constants
defined in util.py (:mod:`pyactor.util`).
"""
if msg[TYPE] == TELL and msg[METHOD] == 'stop':
self.running = False
else:
try:
invoke = getattr(self._obj, msg[METHOD])
params = msg[PARAMS]
if msg[METHOD] in self.ask_parallel:
rpc_id = str(uuid.uuid4())
# add rpc message to pendent AskResponse s
self.pending[rpc_id] = msg
# insert an rpc id to args
para = list(params[0])
para.insert(0, rpc_id)
invoke(*para, **params[1])
return
else:
result = invoke(*params[0], **params[1])
except Exception as e:
result = e
print(result)
self.send_response(result, msg)
def receive_from_ask(self, result, rpc_id):
msg = self.pending[rpc_id]
del self.pending[rpc_id]
self.send_response(result, msg)
# For compatibility. Green threads do not use Locks.
def get_lock(self):
return None
class ParallelAskWrapper(object):
"""Wrapper for ask methods that have to be called in a parallel way."""
def __init__(self, method, actor):
self.__method = method
self.__actor = actor
def __call__(self, *args, **kwargs):
args = list(args)
rpc_id = args[0]
del args[0]
args = tuple(args)
self.host = get_host()
param = (self.__method, rpc_id, args, kwargs)
self.host.new_parallel(self.invoke, param)
def invoke(self, func, rpc_id, args, kwargs):
# put the process in the host list pthreads
self.host.pthreads[getcurrent()] = self.__actor.url
try:
result = func(*args, **kwargs)
except Exception as e:
result = e
self.__actor.receive_from_ask(result, rpc_id)
# remove the process from pthreads
del self.host.pthreads[getcurrent()]
class ParallelTellWrapper(object):
"""
Wrapper for tell methods that have to be called in a parallel way.
"""
def __init__(self, method, actor):
self.__method = method
self.__actor = actor
def __call__(self, *args, **kwargs):
self.host = get_host()
param = (self.__method, args, kwargs)
self.host.new_parallel(self.invoke, param)
def invoke(self, func, args, kwargs):
# put the process in the host list pthreads
self.host.pthreads[getcurrent()] = self.__actor.url
func(*args, **kwargs)
# remove the process from pthreads
del self.host.pthreads[getcurrent()]
|
Green Thread Future¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 | import uuid
from gevent import spawn
from gevent.event import Event
from .channel import Channel
from ..exceptions import PyActorTimeoutError, FutureError
from ..util import TELL, FUTURE, TYPE, METHOD, PARAMS, CHANNEL, TO
from ..util import get_current, get_host, RPC_ID, RESULT
PENDING = 'PENDING'
RUNNING = 'RUNNING'
FINISHED = 'FINISHED'
class Future(object):
"""
Container for the result of an ask query sent asynchronously which
could not be resolved yet.
:param str. fid: future ID.
"""
def __init__(self, fid, future_ref, manager_channel):
self.__condition = Event()
self.__state = PENDING
self.__result = None
self.__exception = None
self.__callbacks = []
self.__method = future_ref[METHOD]
self.__params = future_ref[PARAMS]
self.__actor_channel = future_ref[CHANNEL]
self.__target = future_ref[TO]
self.__channel = manager_channel
self.__id = fid
def _invoke_callbacks(self):
for callback in self.__callbacks:
try:
# msg = TellRequest(TELL, callback[0], [self], callback[2])
msg = {TYPE: TELL, METHOD: callback[0], PARAMS: ([self], {}),
TO: callback[2]}
callback[1].send(msg)
except Exception as e:
raise FutureError(
f"Exception calling callback for {self!r}: {e!r}")
def running(self):
"""Return True if the future is currently executing."""
# with self.__condition:
return self.__state == RUNNING
def done(self):
"""Return True if the future finished executing."""
# with self.__condition:
return self.__state == FINISHED
def __get__result(self):
if self.__exception is not None:
raise self.__exception
else:
return self.__result
def add_callback(self, method):
"""
Attaches a method that will be called when the future finishes.
:param method: A callable from an actor that will be called
when the future completes. The only argument for that
method must be the future itself from which you can get the
result though `future.:meth:`result()``. If the future has
already completed, then the callable will be called
immediately.
.. note:: This functionality only works when called from an actor,
specifying a method from the same actor.
"""
from_actor = get_current()
if from_actor is not None:
callback = (method, from_actor.channel, from_actor.url)
# with self.__condition:
if self.__state is not FINISHED:
self.__callbacks.append(callback)
return
# Invoke the callback directly
# msg = TellRequest(TELL, method, [self], from_actor.url)
msg = {TYPE: TELL, METHOD: method, PARAMS: ([self], {}),
TO: from_actor.url}
from_actor.channel.send(msg)
else:
raise FutureError("add_callback only works when called " +
"from inside an actor")
def result(self, timeout=None):
"""
Returns the result of the call that the future represents.
:param timeout: The number of seconds to wait for the result
if the future has not been completed. None, the default,
sets no limit.
:returns: The result of the call that the future represents.
:raises: TimeoutError: If the timeout is reached before the
future ends execution.
:raises: Exception: If the call raises the Exception.
"""
# with self.__condition:
if self.__state == FINISHED:
return self.__get__result()
self.__condition.wait(timeout)
if self.__state == FINISHED:
return self.__get__result()
else:
raise PyActorTimeoutError(f"Future: {self.__method!r}")
def exception(self, timeout=None):
"""
Return a exception raised by the call that the future
represents.
:param timeout: The number of seconds to wait for the exception
if the future has not been completed. None, the default,
sets no limit.
:returns: The exception raised by the call that the future
represents or None if the call completed without raising.
:raises: TimeoutError: If the timeout is reached before the
future ends execution.
"""
# with self.__condition:
if self.__state == FINISHED:
return self.__exception
self.__condition.wait(timeout)
if self.__state == FINISHED:
return self.__exception
else:
raise PyActorTimeoutError(f"Future: {self.__method!r}")
def send_work(self):
"""
Sends the query to the actor for it to start executing the work.
It is possible to execute once again a future that has finished
if necessary (overwriting the results), but only one execution
at a time.
"""
if self.__set_running():
# msg = FutureRequest(FUTURE, self.__method, self.__params,
# self.__channel, self.__target, self.__id)
msg = {TYPE: FUTURE, METHOD: self.__method, PARAMS: self.__params,
CHANNEL: self.__channel, TO: self.__target,
RPC_ID: self.__id}
self.__actor_channel.send(msg)
else:
raise FutureError("Future already running.")
def __set_running(self):
# """This is only called internally from send_work().
# It marks the future as running or returns false if it
# already was running."""
# with self.__condition:
if self.__state in [PENDING, FINISHED]:
self.__condition.clear()
self.__state = RUNNING
return True
elif self.__state == RUNNING:
return False
def set_result(self, result):
"""
Sets the return value of work associated with the future.
Only called internally.
"""
# with self.__condition:
self.__result = result
self.__state = FINISHED
self.__condition.set()
self._invoke_callbacks()
def set_exception(self, exception):
"""
Sets the result of the future as being the given exception.
Only called internally.
"""
# with self.__condition:
self.__exception = exception
self.__state = FINISHED
self.__condition.set()
self._invoke_callbacks()
class FutureRef(Future):
def result(self, timeout=None):
"""
Returns the result of the call that the future represents.
:param timeout: The number of seconds to wait for the result
if the future has not been completed. None, the default,
sets no limit.
:returns: The result of the call that the future represents.
:raises: TimeoutError: If the timeout is reached before the
future ends execution.
:raises: Exception: If the call raises the Exception.
"""
result = super(FutureRef, self).result(timeout)
return get_host().loads(result)
class FutureManager(object):
"""
A manager that controls the creation and execution of the futures in a host.
"""
def __init__(self):
self.running = False
self.channel = Channel()
self.futures = {}
self.t = None
def __queue_management(self):
self.running = True
while self.running:
response = self.channel.receive()
if response == 'stop':
self.running = False
else:
result = response[RESULT]
future = self.futures[response[RPC_ID]]
if isinstance(result, Exception):
future.set_exception(result)
else:
future.set_result(result)
def new_future(self, future_ref, ref=False):
future_id = str(uuid.uuid4())
if not ref:
future = Future(future_id, future_ref, self.channel)
else:
future = FutureRef(future_id, future_ref, self.channel)
future.send_work()
self.futures[future_id] = future
if not self.running:
self.t = spawn(self.__queue_management)
return future
def stop(self):
self.channel.send('stop')
if self.t is not None:
self.t.join()
self.t = None
self.futures = {}
|
Green Thread Dispatcher¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | import uuid
import pickle
import traceback
from urllib.parse import urlparse
from importlib import import_module
from .actor import Actor
from .channel import Channel
from ..util import FUTURE, ASK_RESPONSE, FUTURE_RESPONSE
from ..util import TYPE, METHOD, TELL, ASK, CHANNEL, FROM, TO, RPC_ID
class RPCDispatcher(Actor):
"""
This is the actor that will manage remote sends and receives
with other hosts. Each host has one, configured depending on
the scheme specified when created.
"""
def __init__(self, url, host, mode):
self.server_model = import_module('pyactor.' + mode + 'server')
self.url = url
self.host = host
aurl = urlparse(url)
address = aurl.netloc.split(':')
ip, port = address[0], address[1]
self.source = self.server_model.Source((ip, int(port)))
self.source.register_function(self.on_message)
self.source.start()
self.running = True
self.channel = Channel()
self.pending = {} # Sent to another host
self.executing = {} # Waiting for the response in this server
self.tell = ['stop']
self.ask = []
self.ask_ref = []
self.tell_ref = []
self.sinks = {}
def get_sink(self, url):
if url in self.sinks.keys():
return self.sinks[url]
else:
self.sinks[url] = self.server_model.Sink(url)
return self.sinks[url]
def receive(self, msg):
if msg[TYPE] == TELL and msg[METHOD] == 'stop':
self.running = False
self.source.stop()
else:
try:
if msg[TYPE] == TELL:
self.get_sink(msg[TO]).send(msg)
elif msg[TYPE] == ASK:
rpc_id = str(uuid.uuid4())
msg[RPC_ID] = rpc_id
self.pending[rpc_id] = msg[CHANNEL]
del msg[CHANNEL]
msg[FROM] = self.url
self.get_sink(msg[TO]).send(msg)
elif msg[TYPE] == ASK_RESPONSE or msg[TYPE] == FUTURE_RESPONSE:
try:
if msg[RPC_ID] in self.executing.keys():
sink = self.get_sink(self.executing[msg[RPC_ID]])
sink.send(msg)
del self.executing[msg[RPC_ID]]
except TypeError as p:
print("Pickle ERR: impossible to marshall a return." +
" Returning a Proxy without the method in " +
f"_ref? {p}")
except Exception as e:
print(("Error sending a response to {!r}. "
.format(self.executing[msg[RPC_ID]])) + str(e))
del self.executing[msg[RPC_ID]]
elif msg[TYPE] == FUTURE:
rpc_id = msg[RPC_ID]
self.pending[rpc_id] = msg[CHANNEL]
del msg[CHANNEL]
msg[FROM] = self.url
self.get_sink(msg[TO]).send(msg)
except TypeError as p:
print("Pickle ERROR: impossible to marshall a parameter." +
f"Passing a Proxy without the method in _ref? {p}")
except Exception as e:
print(e)
def on_message(self, msg):
try:
msg = pickle.loads(msg.data)
if msg[TYPE] == TELL:
self.host.actors[msg[TO]].channel.send(msg)
elif msg[TYPE] == ASK or msg[TYPE] == FUTURE:
# Save rpc id and actor channel
rpc_id = msg[RPC_ID]
self.executing[rpc_id] = msg[FROM]
# Change msg callback channel, add id
msg[CHANNEL] = self.channel
self.host.actors[msg[TO]].channel.send(msg)
elif msg[TYPE] == ASK_RESPONSE or msg[TYPE] == FUTURE_RESPONSE:
if msg[RPC_ID] in self.pending.keys():
self.pending[msg[RPC_ID]].send(msg)
del self.pending[msg[RPC_ID]]
except KeyError as ke:
print("ERROR: The actor", ke, "is offline.")
except Exception as e:
print(f"{self.url} :#: Connection ERROR: {e}")
traceback.print_exc()
|