304 lines
12 KiB
Python
304 lines
12 KiB
Python
try:
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from tiramisu3 import Config
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except:
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from tiramisu import Config
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from inspect import signature
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from typing import Callable, Optional
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import asyncpg
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from json import dumps, loads
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import risotto
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from .utils import _
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from .error import RegistrationError
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from .message import get_messages
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from .context import Context
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from .config import get_config
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from .logger import log
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from pkg_resources import iter_entry_points
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class Services():
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services = {}
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modules_loaded = False
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services_loaded = False
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def load_services(self):
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for entry_point in iter_entry_points(group='risotto_services'):
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self.services.setdefault(entry_point.name, [])
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self.services_loaded = True
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def load_modules(self):
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for entry_point in iter_entry_points(group='risotto_modules'):
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service_name, module_name = entry_point.name.split('.')
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setattr(self, module_name, entry_point.load())
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self.services[service_name].append(module_name)
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self.modules_loaded = True
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def get_services(self):
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if not self.services_loaded:
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self.load_services()
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return [(s, getattr(self, s)) for s in self.services]
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def get_modules(self):
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if not self.modules_loaded:
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self.load_modules()
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return [(m, getattr(self, m)) for s in self.services.values() for m in s]
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def get_services_list(self):
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return self.services.keys()
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def get_modules_list(self):
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return [m for s in self.services for m in self.services[s]]
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def link_to_dispatcher(self,
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dispatcher,
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validate: bool=True,
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test: bool=False,
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):
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for module_name, module in self.get_modules():
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dispatcher.set_module(module_name,
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module,
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test)
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if validate:
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dispatcher.validate()
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services = Services()
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services.load_services()
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setattr(risotto, 'services', services)
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def register(uris: str,
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notification: str=None):
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""" Decorator to register function to the dispatcher
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"""
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if not isinstance(uris, list):
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uris = [uris]
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def decorator(function):
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for uri in uris:
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version, message = uri.split('.', 1)
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dispatcher.set_function(version,
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message,
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notification,
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function)
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return decorator
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class RegisterDispatcher:
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def __init__(self):
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# reference to instanciate module (to inject self in method): {"module_name": instance_of_module}
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self.injected_self = {}
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# postgresql pool
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self.pool = None
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# load tiramisu objects
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self.risotto_modules = services.get_services_list()
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messages, self.option = get_messages(self.risotto_modules)
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# list of uris with informations: {"v1": {"module_name.xxxxx": yyyyyy}}
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self.messages = {}
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for tiramisu_message, obj in messages.items():
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version = obj['version']
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if version not in self.messages:
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self.messages[version] = {}
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self.messages[version][tiramisu_message] = obj
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def get_function_args(self,
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function: Callable):
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# remove self and risotto_context
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first_argument_index = 2
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return {param.name for param in list(signature(function).parameters.values())[first_argument_index:]}
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async def get_message_args(self,
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message: str):
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# load config
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async with await Config(self.option, display_name=lambda self, dyn_name, suffix: self.impl_getname()) as config:
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await config.property.read_write()
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# set message to the message name
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await config.option('message').value.set(message)
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# get message argument
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dico = await config.option(message).value.dict()
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return set(dico.keys())
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async def valid_rpc_params(self,
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version: str,
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message: str,
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function: Callable,
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module_name: str):
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""" parameters function must have strictly all arguments with the correct name
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"""
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# get message arguments
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message_args = await self.get_message_args(message)
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# get function arguments
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function_args = self.get_function_args(function)
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# compare message arguments with function parameter
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# it must not have more or less arguments
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if message_args != function_args:
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# raise if arguments are not equal
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msg = []
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missing_function_args = message_args - function_args
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if missing_function_args:
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msg.append(_(f'missing arguments: {missing_function_args}'))
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extra_function_args = function_args - message_args
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if extra_function_args:
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msg.append(_(f'extra arguments: {extra_function_args}'))
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function_name = function.__name__
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msg = _(' and ').join(msg)
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raise RegistrationError(_(f'error with {module_name}.{function_name} arguments: {msg}'))
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async def valid_event_params(self,
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version: str,
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message: str,
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function: Callable,
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module_name: str):
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""" parameters function validation for event messages
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"""
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# get message arguments
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message_args = await self.get_message_args(message)
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# get function arguments
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function_args = self.get_function_args(function)
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# compare message arguments with function parameter
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# it can have less arguments but not more
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extra_function_args = function_args - message_args
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if extra_function_args:
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# raise if too many arguments
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function_name = function.__name__
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msg = _(f'extra arguments: {extra_function_args}')
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raise RegistrationError(_(f'error with {module_name}.{function_name} arguments: {msg}'))
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def set_function(self,
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version: str,
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message: str,
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notification: str,
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function: Callable):
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""" register a function to an URI
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URI is a message
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"""
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# check if message exists
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if message not in self.messages[version]:
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raise RegistrationError(_(f'the message {message} not exists'))
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# xxx module can only be register with v1.xxxx..... message
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module_name = function.__module__.split('.')[-2]
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message_namespace = message.split('.', 1)[0]
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message_risotto_module, message_namespace, message_name = message.split('.', 2)
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if message_risotto_module not in self.risotto_modules:
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raise RegistrationError(_(f'cannot registered the "{message}" is not "{self.risotto_modules}"'))
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if self.messages[version][message]['pattern'] == 'rpc' and message_namespace != module_name:
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raise RegistrationError(_(f'cannot registered the "{message}" message in module "{module_name}"'))
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# True if first argument is the risotto_context
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function_args = self.get_function_args(function)
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# check if already register
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if 'function' in self.messages[version][message]:
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raise RegistrationError(_(f'uri {version}.{message} already registered'))
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# register
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if self.messages[version][message]['pattern'] == 'rpc':
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register = self.register_rpc
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else:
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register = self.register_event
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register(version,
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message,
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module_name,
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function,
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function_args,
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notification)
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def register_rpc(self,
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version: str,
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message: str,
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module_name: str,
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function: Callable,
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function_args: list,
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notification: Optional[str]):
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self.messages[version][message]['module'] = module_name
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self.messages[version][message]['function'] = function
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self.messages[version][message]['arguments'] = function_args
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if notification:
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self.messages[version][message]['notification'] = notification
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def register_event(self,
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version: str,
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message: str,
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module_name: str,
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function: Callable,
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function_args: list,
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notification: Optional[str]):
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if 'functions' not in self.messages[version][message]:
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self.messages[version][message]['functions'] = []
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dico = {'module': module_name,
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'function': function,
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'arguments': function_args}
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if notification and notification:
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dico['notification'] = notification
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self.messages[version][message]['functions'].append(dico)
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def set_module(self, module_name, module, test):
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""" register and instanciate a new module
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"""
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try:
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self.injected_self[module_name] = module.Risotto(test)
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except AttributeError as err:
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raise RegistrationError(_(f'unable to register the module {module_name}, this module must have Risotto class'))
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def validate(self):
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""" check if all messages have a function
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"""
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missing_messages = []
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for version, messages in self.messages.items():
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for message, message_obj in messages.items():
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if not 'functions' in message_obj and not 'function' in message_obj:
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if message_obj['pattern'] == 'event':
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print(f'{message} prêche dans le désert')
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else:
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missing_messages.append(message)
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if missing_messages:
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raise RegistrationError(_(f'no matching function for uri {missing_messages}'))
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async def on_join(self):
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internal_user = get_config()['global']['internal_user']
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async with self.pool.acquire() as connection:
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await connection.set_type_codec(
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'json',
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encoder=dumps,
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decoder=loads,
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schema='pg_catalog'
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)
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async with connection.transaction():
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for module_name, module in self.injected_self.items():
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risotto_context = Context()
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risotto_context.username = internal_user
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risotto_context.paths.append(f'{module_name}.on_join')
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risotto_context.type = None
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risotto_context.connection = connection
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info_msg = _(f'in module {module_name}.on_join')
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await log.info_msg(risotto_context,
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None,
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info_msg)
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await module.on_join(risotto_context)
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async def load(self):
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# valid function's arguments
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db_conf = get_config()['database']['dsn']
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self.pool = await asyncpg.create_pool(db_conf)
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async with self.pool.acquire() as connection:
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async with connection.transaction():
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for version, messages in self.messages.items():
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for message, message_infos in messages.items():
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if message_infos['pattern'] == 'rpc':
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module_name = message_infos['module']
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function = message_infos['function']
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await self.valid_rpc_params(version,
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message,
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function,
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module_name)
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elif 'functions' in message_infos:
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# event with functions
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for function_infos in message_infos['functions']:
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module_name = function_infos['module']
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function = function_infos['function']
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await self.valid_event_params(version,
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message,
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function,
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module_name)
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