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import { Writable, writable } from "svelte/store";
import type { IncomingRequest } from "../../models/incoming_request";
import type { OwnRequest } from "../../models/own_request";
import type { Unregister } from "../channel/messages/event_handler";
import type {
RequestIceCandidateMessage,
ShareIceCandidateMessage,
} from "../channel/messages/messages";
export enum TransferState {
CONNECTING,
TRANSFERRING,
DONE,
}
export type Transfer = {
pc: RTCPeerConnection;
channel: RTCDataChannel;
state: Writable<TransferState>;
};
const servers = {
iceServers: [
{
urls: [
"stun:stun1.l.google.com:19302",
"stun:stun2.l.google.com:19302",
],
},
],
iceCandidatePoolSize: 10,
};
export function createTransfer(
onChannel: (channel: RTCDataChannel, completeTransfer: () => void) => void
): Transfer {
const pc = new RTCPeerConnection(servers);
const channel = pc.createDataChannel("channel", {
negotiated: true,
id: 0,
});
const state = writable(TransferState.CONNECTING);
const transfer = {
pc,
channel,
state,
};
channel.onopen = () => {
state.set(TransferState.TRANSFERRING);
onChannel(channel, () => onTransferComplete(transfer));
};
return transfer;
}
export function bindTransfer(
request: OwnRequest | IncomingRequest,
transferPromise: Promise<Transfer>,
completeTransfer: () => void
) {
transferPromise.then(transfer => {
request.transfer = transfer;
const unsubsribe = transfer.state.subscribe(transferState => {
if (transferState === TransferState.DONE) {
unsubsribe();
// Once the data has been transferred we can remove the transfer
request.transfer = null;
completeTransfer();
}
});
});
}
export function onIncomingIceCandidate(
transfer: Transfer,
message: ShareIceCandidateMessage | RequestIceCandidateMessage
) {
transfer.pc.addIceCandidate(message.candidate);
}
export function unregisterIceOnComplete(
transfer: Transfer,
unregister: Unregister
) {
transfer.pc.onicegatheringstatechange = event => {
const connection = event.target as any;
if (connection.iceGatheringState === "complete") {
unregister();
}
};
}
function onTransferComplete(transfer: Transfer) {
transfer.state.set(TransferState.DONE);
transfer.pc.close();
}
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