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import { Writable, writable } from "svelte/store";
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 addRemoteIceCandidate(
transfer: Transfer,
candidate: RTCIceCandidateInit
) {
transfer.pc.addIceCandidate(candidate);
}
function onTransferComplete(transfer: Transfer) {
transfer.state.set(TransferState.DONE);
transfer.pc.close();
}
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