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import asyncio
from abc import abstractmethod
from enum import Enum
from typing import Dict, List, Optional
from kennel.app import logger
from kennel.engine.entities.entity import Entity, EntityManager
from .system import System, SystemType
class EventType(str, Enum):
INITIAL_STATE = "INITIAL_STATE"
SET_CONTROLLABLE = "SET_CONTROLLABLE"
ENTITY_BORN = "ENTITY_BORN"
ENTITY_DEATH = "ENTITY_DEATH"
ENTITY_POSITION_UPDATE = "ENTITY_POSITION_UPDATE"
class Event:
def __init__(self, event_type: EventType, data: dict):
self.event_type = event_type
self.data = data
def __str__(self) -> str:
return f"Event({self.event_type}, {self.data})"
def to_dict(self) -> dict:
return {"event_type": self.event_type, "data": self.data}
@staticmethod
def from_dict(data: dict) -> Optional["Event"]:
if "event_type" not in data or "data" not in data:
return
event_type = data["event_type"]
if event_type == EventType.INITIAL_STATE:
return InitialStateEvent(
data["data"]["world"]["width"],
data["data"]["world"]["height"],
data["data"]["entities"],
)
if event_type == EventType.SET_CONTROLLABLE:
return SetControllableEvent(data["data"]["id"], data["data"]["client_id"])
if event_type == EventType.ENTITY_BORN:
return EntityBornEvent(data["data"])
if event_type == EventType.ENTITY_POSITION_UPDATE:
return EntityPositionUpdateEvent(
data["data"]["id"], data["data"]["position"]
)
if event_type == EventType.ENTITY_DEATH:
return EntityDeathEvent(data["data"]["id"])
logger.warn(f"Unknown event type: {data['event_type']}")
return Event(EventType(data["event_type"]), data["data"])
class InitialStateEvent(Event):
def __init__(
self, world_width: int, world_height: int, entities: Dict[str, Entity]
):
self.world_width = world_width
self.world_height = world_height
self.entities = entities
super().__init__(
EventType.INITIAL_STATE,
{
"world": {"width": world_width, "height": world_height},
"entities": entities,
},
)
class SetControllableEvent(Event):
def __init__(self, entity_id: str, client_id: str):
self.entity_id = entity_id
self.client_id = client_id
super().__init__(
EventType.SET_CONTROLLABLE, {"id": entity_id, "client_id": client_id}
)
class EntityBornEvent(Event):
def __init__(self, entity: Entity):
self.entity = entity
super().__init__(EventType.ENTITY_BORN, {"entity": entity.to_dict()})
class EntityPositionUpdateEvent(Event):
def __init__(self, entity_id: str, position: dict):
super().__init__(
EventType.ENTITY_POSITION_UPDATE,
{"id": entity_id, "position": position},
)
class EntityDeathEvent(Event):
def __init__(self, entity_id: str):
super().__init__(EventType.ENTITY_DEATH, {"id": entity_id})
class Publishable:
@abstractmethod
async def publish(self, event: List[Event]):
pass
class UpstreamEventProcessor:
@abstractmethod
def accept(
self, entity_manager: EntityManager, client_event: tuple[Event, str]
) -> Optional[Event]:
pass
class NetworkSystem(System):
event_processor: UpstreamEventProcessor
sever_events: List[Event]
client_upstream_events: List[tuple[Event, str]]
clients: Dict[str, tuple[Publishable, List[Event]]]
def __init__(self, upstream_event_processor: UpstreamEventProcessor):
super().__init__(SystemType.NETWORK)
self.upstream_event_processor = upstream_event_processor
self.server_events = [] # events to propogate to the entire network
self.client_upstream_events = [] # events that come from the clients
self.clients = {}
async def update(self, entity_manager: EntityManager, delta_time: float) -> None:
for event in self.client_upstream_events:
produced_event = self.upstream_event_processor.accept(entity_manager, event)
if produced_event is not None:
self.server_events.append(produced_event)
promises = [
client.publish(self.server_events + events)
for client, events in self.clients.values()
if len(self.server_events + events) > 0
]
await asyncio.gather(*promises)
self.server_events = []
self.client_upstream_events = []
for client_id in self.clients.keys():
(client, _) = self.clients[client_id]
self.clients[client_id] = (client, [])
def server_global_event(self, event: Event) -> None:
self.server_events.append(event)
def client_upstream_event(self, client_id: str, event: Event) -> None:
self.client_upstream_events.append((event, client_id))
def client_downstream_event(self, client_id: str, event: Event) -> None:
if client_id not in self.clients:
logger.info(f"client {client_id} not found")
return
(client, events) = self.clients[client_id]
self.clients[client_id] = (client, events + [event])
def add_client(self, client_id: str, client: Publishable) -> None:
self.clients[client_id] = (client, [])
def remove_client(self, client_id: str) -> None:
del self.clients[client_id]
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