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import { Channel, Push, Socket } from "phoenix";
import { get, Readable, writable, Writable } from "svelte/store";
import {
HandlerFn,
EventHandler,
registerHandlerForSpecificToken,
UnregisterFn,
registerHandler,
} from "./messages/event_handler";
import type { AnyMessage, TokenizedMessage } from "./messages/messages";
import { connectSocket, fetchToken } from "./socket";
export enum ConnectionState {
CONNECTING_SOCKET,
FETCHING_TOKEN,
CONNECTING_CHANNEL,
CONNECTED,
}
export type Connection = {
socket: Socket;
channel: Channel | null;
token: string | null;
state: Writable<ConnectionState>;
handlers: EventHandler;
};
const connection: Connection = {
socket: new Socket("/socket", {}),
channel: null,
token: null,
state: writable(ConnectionState.CONNECTING_SOCKET),
handlers: {},
};
export async function start() {
await connectSocket(connection.socket);
updateState(ConnectionState.FETCHING_TOKEN);
connection.token = await fetchToken(connection.socket);
return connection;
}
export function send(event: string, data: any): Push {
if (getState() !== ConnectionState.CONNECTED) {
throw new Error("There is no connection yet.");
}
return connection.channel.push(event, data);
}
export function onWithToken<M extends TokenizedMessage>(
event: M["event_name"],
token: string | null,
handler: HandlerFn<M>
): UnregisterFn {
return registerHandlerForSpecificToken(
connection.handlers,
connection.channel,
event,
token,
handler
);
}
export function on<M extends AnyMessage>(
event: M["event_name"],
handler: HandlerFn<M>
): UnregisterFn {
return registerHandler(
connection.handlers,
connection.channel,
event,
handler
);
}
export function getOwnToken(): string {
if (getState() <= ConnectionState.FETCHING_TOKEN) {
throw new Error("There is no token yet.");
}
return connection.token;
}
export function getState(): ConnectionState {
return get(connection.state);
}
export function updateState(state: ConnectionState) {
connection.state.set(state);
}
export function getStateStore(): Readable<ConnectionState> {
return connection.state;
}
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