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export enum EventType {
INITIAL_STATE = "INITIAL_STATE",
SET_CONTROLLABLE = "SET_CONTROLLABLE",
ENTITY_BORN = "ENTITY_BORN",
ENTITY_DEATH = "ENTITY_DEATH",
ENTITY_POSITION_UPDATE = "ENTITY_POSITION_UPDATE",
}
export interface Event {
event_type: EventType;
data: any;
}
export interface EntityPositionUpdateEvent extends Event {
event_type: EventType.ENTITY_POSITION_UPDATE;
data: {
id: string;
position: {
x: number;
y: number;
};
};
}
export interface InitialStateEvent extends Event {
event_type: EventType.INITIAL_STATE;
data: {
world: { width: number; height: number };
entities: any[];
};
}
export interface SetControllableEvent extends Event {
event_type: EventType.SET_CONTROLLABLE;
data: {
id: string;
client_id: string;
};
}
export interface EventQueue {
peek(): Event[];
clear(): void;
}
export interface EventPublisher {
add(event: Event): void;
publish(): void;
}
export class WebSocketEventQueue implements EventQueue {
private queue: Event[];
constructor(websocket: WebSocket) {
this.queue = [];
this.listen_to(websocket);
}
public peek() {
return this.queue;
}
public clear() {
this.queue = [];
}
private listen_to(websocket: WebSocket) {
websocket.onmessage = ({ data }) => {
const [event_type, event_data] = JSON.parse(data);
this.queue.push({ event_type, data: event_data } as Event);
};
}
}
export class WebsocketEventPublisher implements EventPublisher {
private queue: Event[];
constructor(private readonly websocket: WebSocket) {
this.queue = [];
}
public add(event: Event) {
this.queue.push(event);
}
public publish() {
this.websocket.send(JSON.stringify(this.queue));
this.queue = [];
}
}
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