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import { writable, Writable } from "svelte/store";
import { RookType } from "../models/rook_type";
import { Connection } from "../network/channel/connection";
import type {
RequestAcceptedMessage,
RequestAcknowledgedMessage,
ShareCancelledMessage,
ShareIceCandidateMessage,
} from "../network/channel/messages/messages";
import { respondToOffer } from "../network/transfer/request_transfer";
import { addRemoteIceCandidate, Transfer } from "../network/transfer/transfer";
import { isClientRequest } from "./constant_state";
import b from "../utils/bind";
export enum RequestStateType {
CONNECTING,
WAITING_FOR_RESPONSE,
IN_FLIGHT,
DONE,
DECLINED,
SHARE_CANCELLED,
NO_SUCH_SHARE,
}
type RequestState = {
type: Writable<RequestStateType>;
state:
| Connecting
| WaitingForResponse
| Transferring
| Done
| Declined
| ShareCancelled
| NoSuchShare;
};
let request: RequestState | null = null;
export function initializeRequest() {
if (!isClientRequest()) {
throw new Error(
"Tried to initialize request state on non-request client."
);
}
if (request) {
throw new Error("Request state already initialized.");
}
request = {
type: writable(RequestStateType.CONNECTING),
state: new Connecting(),
};
}
export function getRequestState(): RequestState {
if (!isClientRequest()) {
throw new Error("Tried to access share state on non-share client.");
}
return request;
}
class Connecting {
private connection: Connection;
constructor() {
this.connection = new Connection();
this.connection.setChannelMessageHandler({
request_acknowledged: b(this, this.onRequestAcknowledged),
});
this.connection.start(RookType.REQUEST);
}
private onRequestAcknowledged(m: RequestAcknowledgedMessage) {
request.type.set(RequestStateType.WAITING_FOR_RESPONSE);
request.state = new WaitingForResponse(this.connection);
}
}
class WaitingForResponse {
private connection: Connection;
constructor(connection: Connection) {
this.connection = connection;
this.connection.setChannelMessageHandler({
request_accepted: b(this, this.onRequestAccepted),
share_cancelled: b(this, this.onShareCancelled),
// TODO: request_declined
});
}
private onRequestAccepted(m: RequestAcceptedMessage) {
request.type.set(RequestStateType.IN_FLIGHT);
request.state = new Transferring(this.connection, m);
}
private onShareCancelled(m: ShareCancelledMessage) {
request.type.set(RequestStateType.SHARE_CANCELLED);
request.state = null;
}
}
class Transferring {
private connection: Connection;
private transfer: Transfer | null = null;
private unaddedIceCandidates: RTCIceCandidateInit[] = [];
constructor(connection: Connection, offer: RTCSessionDescriptionInit) {
this.connection = connection;
this.connection.setChannelMessageHandler({
share_ice_candidate: b(this, this.onShareIceCandidate),
// TODO: share_cancelled
});
const offerPromise = respondToOffer(
this.connection,
offer,
b(this, this.onTransferComplete)
);
offerPromise.then(transfer => {
for (const candidate of this.unaddedIceCandidates) {
addRemoteIceCandidate(transfer, candidate);
}
this.unaddedIceCandidates = [];
});
}
private onShareIceCandidate(m: ShareIceCandidateMessage) {
if (!this.transfer) {
this.unaddedIceCandidates.push(m.candidate);
} else {
addRemoteIceCandidate(this.transfer, m.candidate);
}
}
private onTransferComplete() {
request.type.set(RequestStateType.DONE);
request.state = null;
}
}
// Finished states.
type Done = null;
type Declined = null;
type ShareCancelled = null;
type NoSuchShare = null;
|
