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export type OverlayMessage = {
roomId: string;
author: string;
text: string;
platform?: string;
avatarUrl?: string;
};
export type OverlayMessageInput = {
roomId: string;
text: string;
author?: string;
platform?: string;
avatarUrl?: string;
};
export type OverlayRelayConfig = {
endpoint?: string;
};
type ResolvedOverlayRelayConfig = {
endpoint: string;
};
const OVERLAY_ROOM_PREFIX = "overlay-chat-";
const SERVER_NOT_READY_WARNING =
"[OverlaySocket] Overlay relay endpoint is not configured; overlay messages will be dropped";
const trimToOptional = (value: unknown): string | undefined => {
if (typeof value !== "string") {
return undefined;
}
const text = value.trim();
return text.length > 0 ? text : undefined;
};
const sanitizeEndpoint = (value?: string): string | null => {
if (typeof value !== "string") {
return null;
}
const trimmed = value.trim();
return trimmed.length > 0 ? trimmed : null;
};
let relayEndpoint: string | null = null;
let serverNotReadyWarningLogged = false;
export const formatOverlayRoomId = (value: string): string => {
const trimmed = value.trim();
if (!trimmed) {
return "";
}
return trimmed.startsWith(OVERLAY_ROOM_PREFIX)
? trimmed
: `${OVERLAY_ROOM_PREFIX}${trimmed}`;
};
const resolveRelayConfig = (
overrides?: OverlayRelayConfig
): ResolvedOverlayRelayConfig | null => {
const endpoint =
sanitizeEndpoint(overrides?.endpoint) ?? relayEndpoint ?? null;
if (!endpoint) {
return null;
}
return { endpoint };
};
export function configureOverlayRelay(config: OverlayRelayConfig): void {
relayEndpoint = sanitizeEndpoint(config.endpoint);
serverNotReadyWarningLogged = false;
}
export function isOverlayRelayConfigured(): boolean {
return Boolean(relayEndpoint);
}
export async function sendOverlayMessage(
message: OverlayMessageInput,
overrides?: OverlayRelayConfig
): Promise<OverlayMessage | null> {
const resolvedConfig = resolveRelayConfig(overrides);
if (!resolvedConfig) {
if (!serverNotReadyWarningLogged) {
console.warn(SERVER_NOT_READY_WARNING);
serverNotReadyWarningLogged = true;
}
return null;
}
const roomId = message.roomId?.trim();
const text = message.text?.trim();
if (!roomId || !text) {
console.warn(
"[OverlaySocket] Missing roomId or text; overlay message was not dispatched",
{ roomId }
);
return null;
}
const author = (message.author ?? "server").toString().trim() || "server";
const payload: OverlayMessage = {
roomId,
author,
text,
platform: trimToOptional(message.platform),
avatarUrl: trimToOptional(message.avatarUrl),
};
const dispatched = await emitOverlayMessage(roomId, payload, resolvedConfig);
return dispatched ? payload : null;
}
const emitOverlayMessage = async (
roomId: string,
payload: OverlayMessage,
config: ResolvedOverlayRelayConfig
): Promise<boolean> => {
return new Promise<boolean>((resolve) => {
const socket = createSocketClient(roomId, config);
let settled = false;
const finalize = (success: boolean) => {
if (settled) {
return;
}
settled = true;
socket.off("connect", handleConnect);
socket.off("connect_error", handleError);
socket.disconnect();
resolve(success);
};
const handleConnect = () => {
try {
socket.emit("chat:send", {
text: payload.text,
author: payload.author,
platform: payload.platform,
avatarUrl: payload.avatarUrl,
});
finalize(true);
} catch (error) {
console.error("[OverlaySocket] Failed to emit chat payload", error);
finalize(false);
}
};
const handleError = (error: unknown) => {
console.error(
"[OverlaySocket] Overlay socket client failed to connect",
error
);
finalize(false);
};
socket.once("connect", handleConnect);
socket.once("connect_error", handleError);
});
};
const createSocketClient = (
roomId: string,
config: ResolvedOverlayRelayConfig
): Socket => {
return io(config.endpoint, {
transports: ["websocket"],
forceNew: true,
query: { roomId },
});
};
export const __overlaySocketInternals = {
reset() {
relayEndpoint = null;
serverNotReadyWarningLogged = false;
},
getConfig(): OverlayRelayConfig {
return {
endpoint: relayEndpoint ?? undefined,
};
},
};
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