283 lines
12 KiB
Python
283 lines
12 KiB
Python
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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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 INTERNAL_USER, get_config
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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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# list of uris with informations: {"v1": {"module_name.xxxxx": yyyyyy}}
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self.messages = {}
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# load tiramisu objects
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messages, self.option = get_messages()
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#FIXME
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version = 'v1'
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self.messages[version] = {}
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for tiramisu_message, obj in messages.items():
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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
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first_argument_index = 1
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return [param.name for param in list(signature(function).parameters.values())[first_argument_index:]]
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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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async def get_message_args():
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# load config
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config = await Config(self.option)
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await config.property.read_write()
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# set message to the uri 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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def get_function_args():
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function_args = self.get_function_args(function)
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# risotto_context is a special argument, remove it
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function_args = function_args[1:]
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return set(function_args)
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# get message arguments
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message_args = await get_message_args()
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# get function arguments
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function_args = get_function_args()
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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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async def get_message_args():
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# load config
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config = await Config(self.option)
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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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def get_function_args():
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function_args = self.get_function_args(function)
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# risotto_context is a special argument, remove it
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function_args = function_args[1:]
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return set(function_args)
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# get message arguments
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message_args = await get_message_args()
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# get function arguments
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function_args = get_function_args()
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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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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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function_args.pop(0)
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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'missing uri {missing_messages}'))
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async def on_join(self):
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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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await module.on_join(risotto_context)
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async def insert_message(self,
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connection,
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uri):
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sql = """INSERT INTO URI(URIName) VALUES ($1)
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ON CONFLICT (URIName) DO NOTHING
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"""
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await connection.fetchval(sql,
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uri)
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async def load(self):
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# valid function's arguments
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db_conf = get_config().get('database')
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engine = db_conf.get('engine')
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host = db_conf.get('host')
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dbname = db_conf.get('dbname')
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dbuser = db_conf.get('user')
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dbpassword = db_conf.get('password')
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dbport = db_conf.get('port')
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cfg = "{}://{}:{}@{}:{}/{}".format(engine, dbuser, dbpassword, host, dbport, dbname)
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self.pool = await asyncpg.create_pool(cfg)
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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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else:
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if 'functions' in message_infos:
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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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await self.insert_message(connection,
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f'{version}.{message}')
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