608 lines
21 KiB
TypeScript
608 lines
21 KiB
TypeScript
import { UUID } from './UUID';
|
|
import * as dgram from 'dgram';
|
|
import { Socket } from 'dgram';
|
|
import { Packet } from './Packet';
|
|
import { MessageBase } from './MessageBase';
|
|
import { PacketAckMessage } from './messages/PacketAck';
|
|
import { Message } from '../enums/Message';
|
|
import { StartPingCheckMessage } from './messages/StartPingCheck';
|
|
import { CompletePingCheckMessage } from './messages/CompletePingCheck';
|
|
import { Subscription } from 'rxjs';
|
|
import { filter } from 'rxjs/operators'
|
|
import { FilterResponse } from '../enums/FilterResponse';
|
|
import { Subject } from 'rxjs';
|
|
import { TimeoutError } from './TimeoutError';
|
|
import { RequestXferMessage } from './messages/RequestXfer';
|
|
import { SendXferPacketMessage } from './messages/SendXferPacket';
|
|
import { ConfirmXferPacketMessage } from './messages/ConfirmXferPacket';
|
|
import { AbortXferMessage } from './messages/AbortXfer';
|
|
import { PacketFlags } from '../enums/PacketFlags';
|
|
import { AssetType } from '../enums/AssetType';
|
|
import { Utils } from './Utils';
|
|
|
|
import * as Long from 'long';
|
|
|
|
import Timer = NodeJS.Timer;
|
|
|
|
export class Circuit
|
|
{
|
|
secureSessionID: UUID;
|
|
sessionID: UUID;
|
|
circuitCode: number;
|
|
udpBlacklist: string[];
|
|
timestamp: number;
|
|
client: Socket | null = null;
|
|
port: number;
|
|
ipAddress: string;
|
|
sequenceNumber = 0;
|
|
|
|
awaitingAck: {
|
|
[key: number]: {
|
|
packet: Packet,
|
|
timeout: Timer,
|
|
sent: number
|
|
}
|
|
} = {};
|
|
receivedPackets: {
|
|
[key: number]: Timer
|
|
} = {};
|
|
active = false;
|
|
|
|
private onPacketReceived: Subject<Packet>;
|
|
private onAckReceived: Subject<number>;
|
|
|
|
constructor()
|
|
{
|
|
this.onPacketReceived = new Subject<Packet>();
|
|
this.onAckReceived = new Subject<number>();
|
|
}
|
|
|
|
subscribeToMessages(ids: number[], callback: (packet: Packet) => void): Subscription
|
|
{
|
|
const lookupObject: { [key: number]: boolean } = {};
|
|
for (const id of ids)
|
|
{
|
|
lookupObject[id] = true;
|
|
}
|
|
|
|
return this.onPacketReceived.pipe(filter((packet: Packet): boolean =>
|
|
{
|
|
return lookupObject[packet.message.id];
|
|
}) as any).subscribe(callback as any);
|
|
}
|
|
|
|
sendMessage(message: MessageBase, flags: PacketFlags): number
|
|
{
|
|
if (!this.active)
|
|
{
|
|
throw new Error('Attempting to send a message on a closed circuit');
|
|
}
|
|
const packet: Packet = new Packet();
|
|
packet.message = message;
|
|
packet.sequenceNumber = this.sequenceNumber++;
|
|
packet.packetFlags = flags;
|
|
this.sendPacket(packet);
|
|
return packet.sequenceNumber;
|
|
}
|
|
|
|
private sendXferPacket(xferID: Long, packetID: number, data: Buffer, pos: { position: number }): void
|
|
{
|
|
const sendXfer = new SendXferPacketMessage();
|
|
let final = false;
|
|
sendXfer.XferID = {
|
|
ID: xferID,
|
|
Packet: packetID
|
|
};
|
|
const packetLength = Math.min(data.length - pos.position, 1000);
|
|
if (packetLength < 1000)
|
|
{
|
|
sendXfer.XferID.Packet = (sendXfer.XferID.Packet | 0x80000000) >>> 0;
|
|
final = true;
|
|
}
|
|
if (packetID === 0)
|
|
{
|
|
const packet = Buffer.allocUnsafe(packetLength + 4);
|
|
packet.writeUInt32LE(data.length, 0);
|
|
data.copy(packet, 4, 0, packetLength);
|
|
sendXfer.DataPacket = {
|
|
Data: packet
|
|
};
|
|
pos.position += packetLength;
|
|
}
|
|
else
|
|
{
|
|
const packet = data.slice(pos.position, pos.position + packetLength);
|
|
sendXfer.DataPacket = {
|
|
Data: packet
|
|
};
|
|
pos.position += packetLength;
|
|
}
|
|
console.log('Sent packet ' + packetID + ', ' + packetLength + ' bytes');
|
|
this.sendMessage(sendXfer, PacketFlags.Reliable);
|
|
if (final)
|
|
{
|
|
pos.position = -1;
|
|
}
|
|
}
|
|
|
|
XferFileUp(xferID: Long, data: Buffer): Promise<void>
|
|
{
|
|
return new Promise<void>((resolve, reject) =>
|
|
{
|
|
let packetID = 0;
|
|
const pos = {
|
|
position: 0
|
|
};
|
|
|
|
const subs = this.subscribeToMessages([
|
|
Message.AbortXfer,
|
|
Message.ConfirmXferPacket
|
|
], (packet: Packet) =>
|
|
{
|
|
switch (packet.message.id)
|
|
{
|
|
case Message.ConfirmXferPacket:
|
|
{
|
|
const msg = packet.message as ConfirmXferPacketMessage;
|
|
if (msg.XferID.ID.equals(xferID))
|
|
{
|
|
if (pos.position > -1)
|
|
{
|
|
console.log('Packet confirmed, sending next. Position: ' + pos.position);
|
|
packetID++;
|
|
this.sendXferPacket(xferID, packetID, data, pos);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case Message.AbortXfer:
|
|
{
|
|
const msg = packet.message as AbortXferMessage;
|
|
if (msg.XferID.ID.equals(xferID))
|
|
{
|
|
console.log('Transfer aborted');
|
|
subs.unsubscribe();
|
|
reject(new Error('Transfer aborted'));
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
this.sendXferPacket(xferID, packetID, data, pos);
|
|
if (pos.position === -1)
|
|
{
|
|
subs.unsubscribe();
|
|
resolve();
|
|
}
|
|
});
|
|
}
|
|
|
|
XferFileDown(fileName: string, deleteOnCompletion: boolean, useBigPackets: boolean, vFileID: UUID, vFileType: AssetType, fromCache: boolean): Promise<Buffer>
|
|
{
|
|
return new Promise<Buffer>((resolve, reject) =>
|
|
{
|
|
let subscription: null | Subscription = null;
|
|
let timeout: Timer | null = null;
|
|
const receivedChunks: { [key: number]: Buffer } = {};
|
|
const resetTimeout = function(): void
|
|
{
|
|
if (timeout !== null)
|
|
{
|
|
clearTimeout(timeout);
|
|
}
|
|
timeout = setTimeout(() =>
|
|
{
|
|
if (subscription !== null)
|
|
{
|
|
subscription.unsubscribe();
|
|
}
|
|
reject(new Error('Xfer Timeout'));
|
|
}, 10000);
|
|
};
|
|
resetTimeout();
|
|
const xferRequest = new RequestXferMessage();
|
|
const transferID = UUID.random().getLong();
|
|
xferRequest.XferID = {
|
|
ID: transferID,
|
|
Filename: Utils.StringToBuffer(fileName),
|
|
FilePath: (fromCache) ? 4 : 0,
|
|
DeleteOnCompletion: deleteOnCompletion,
|
|
UseBigPackets: useBigPackets,
|
|
VFileID: vFileID,
|
|
VFileType: vFileType
|
|
};
|
|
this.sendMessage(xferRequest, PacketFlags.Reliable);
|
|
let finished = false;
|
|
let finishID = 0;
|
|
let firstPacket = true;
|
|
let dataSize = 0;
|
|
subscription = this.subscribeToMessages([
|
|
Message.SendXferPacket,
|
|
Message.AbortXfer
|
|
], (packet: Packet) =>
|
|
{
|
|
switch (packet.message.id)
|
|
{
|
|
case Message.AbortXfer:
|
|
{
|
|
const message = packet.message as AbortXferMessage;
|
|
if (message.XferID.ID.compare(transferID) === 0)
|
|
{
|
|
if (timeout !== null)
|
|
{
|
|
clearTimeout(timeout);
|
|
}
|
|
if (subscription !== null)
|
|
{
|
|
subscription.unsubscribe();
|
|
}
|
|
reject(new Error('Xfer Aborted'));
|
|
}
|
|
break;
|
|
}
|
|
case Message.SendXferPacket:
|
|
{
|
|
const message = packet.message as SendXferPacketMessage;
|
|
if (message.XferID.ID.compare(transferID) === 0)
|
|
{
|
|
resetTimeout();
|
|
const packetNum = message.XferID.Packet & 0x7FFFFFFF;
|
|
const finishedNow = message.XferID.Packet & 0x80000000;
|
|
if (firstPacket)
|
|
{
|
|
dataSize = message.DataPacket.Data.readUInt32LE(0);
|
|
receivedChunks[packetNum] = message.DataPacket.Data.slice(4);
|
|
firstPacket = false;
|
|
}
|
|
else
|
|
{
|
|
receivedChunks[packetNum] = message.DataPacket.Data;
|
|
}
|
|
const confirm = new ConfirmXferPacketMessage();
|
|
confirm.XferID = {
|
|
ID: transferID,
|
|
Packet: packetNum
|
|
};
|
|
this.sendMessage(confirm, PacketFlags.Reliable);
|
|
|
|
if (finishedNow)
|
|
{
|
|
finished = true;
|
|
finishID = packetNum;
|
|
}
|
|
|
|
if (finished)
|
|
{
|
|
// Check if we have all the pieces
|
|
for (let x = 0; x <= finishID; x++)
|
|
{
|
|
if (!receivedChunks[x])
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
const conc: Buffer[] = [];
|
|
for (let x = 0; x <= finishID; x++)
|
|
{
|
|
conc.push(receivedChunks[x]);
|
|
}
|
|
if (timeout !== null)
|
|
{
|
|
clearTimeout(timeout);
|
|
}
|
|
if (subscription !== null)
|
|
{
|
|
subscription.unsubscribe();
|
|
}
|
|
const buf = Buffer.concat(conc);
|
|
if (buf.length !== dataSize)
|
|
{
|
|
console.warn('Warning: Received data size does not match expected');
|
|
}
|
|
resolve(buf);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
resend(sequenceNumber: number): void
|
|
{
|
|
if (!this.active)
|
|
{
|
|
console.log('Resend triggered, but circuit is not active!');
|
|
return;
|
|
}
|
|
if (this.awaitingAck[sequenceNumber])
|
|
{
|
|
const toResend: Packet = this.awaitingAck[sequenceNumber].packet;
|
|
toResend.packetFlags = toResend.packetFlags | PacketFlags.Resent;
|
|
this.sendPacket(toResend);
|
|
}
|
|
}
|
|
|
|
waitForAck(ack: number, timeout: number): Promise<void>
|
|
{
|
|
return new Promise<void>((resolve, reject) =>
|
|
{
|
|
const handleObj: {
|
|
timeout: Timer | null,
|
|
subscription: Subscription | null
|
|
} = {
|
|
timeout: null,
|
|
subscription: null
|
|
};
|
|
handleObj.timeout = setTimeout(() =>
|
|
{
|
|
if (handleObj.subscription !== null)
|
|
{
|
|
handleObj.subscription.unsubscribe();
|
|
reject(new Error('Timeout'));
|
|
}
|
|
}, timeout);
|
|
|
|
handleObj.subscription = this.onAckReceived.subscribe((sequenceNumber: number) =>
|
|
{
|
|
if (sequenceNumber === ack)
|
|
{
|
|
if (handleObj.timeout !== null)
|
|
{
|
|
clearTimeout(handleObj.timeout);
|
|
handleObj.timeout = null;
|
|
}
|
|
if (handleObj.subscription !== null)
|
|
{
|
|
handleObj.subscription.unsubscribe();
|
|
handleObj.subscription = null;
|
|
}
|
|
resolve();
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
init(): void
|
|
{
|
|
if (this.client !== null)
|
|
{
|
|
this.client.close();
|
|
}
|
|
this.client = dgram.createSocket('udp4');
|
|
this.client.on('listening', () =>
|
|
{
|
|
|
|
});
|
|
|
|
this.client.on('message', (message, remote) =>
|
|
{
|
|
if (remote.address === this.ipAddress)
|
|
{
|
|
this.receivedPacket(message);
|
|
}
|
|
});
|
|
|
|
this.client.on('error', () =>
|
|
{
|
|
|
|
});
|
|
this.active = true;
|
|
}
|
|
|
|
shutdown(): void
|
|
{
|
|
for (const sequenceNumber of Object.keys(this.awaitingAck))
|
|
{
|
|
clearTimeout(this.awaitingAck[parseInt(sequenceNumber, 10)].timeout);
|
|
delete this.awaitingAck[parseInt(sequenceNumber, 10)];
|
|
}
|
|
for (const sequenceNumber of Object.keys(this.receivedPackets))
|
|
{
|
|
const seq: number = parseInt(sequenceNumber, 10);
|
|
clearTimeout(this.receivedPackets[seq]);
|
|
delete this.receivedPackets[seq];
|
|
}
|
|
if (this.client !== null)
|
|
{
|
|
this.client.close();
|
|
this.client = null;
|
|
this.onPacketReceived.complete();
|
|
this.onAckReceived.complete();
|
|
}
|
|
this.active = false;
|
|
}
|
|
|
|
waitForMessage<T extends MessageBase>(id: Message, timeout: number, messageFilter?: (message: T) => FilterResponse): Promise<T>
|
|
{
|
|
return new Promise<T>((resolve, reject) =>
|
|
{
|
|
const handleObj: {
|
|
timeout: Timer | null,
|
|
subscription: Subscription | null
|
|
} = {
|
|
timeout: null,
|
|
subscription: null
|
|
};
|
|
|
|
const timeoutFunc = () =>
|
|
{
|
|
if (handleObj.subscription !== null)
|
|
{
|
|
handleObj.subscription.unsubscribe();
|
|
const err = new TimeoutError('Timeout waiting for message of type ' + Message[id]);
|
|
err.timeout = true;
|
|
err.waitingForMessage = id;
|
|
reject(err);
|
|
}
|
|
};
|
|
|
|
handleObj.timeout = setTimeout(timeoutFunc, timeout);
|
|
|
|
handleObj.subscription = this.subscribeToMessages([id], (packet: Packet) =>
|
|
{
|
|
let finish = false;
|
|
if (packet.message.id === id)
|
|
{
|
|
if (messageFilter === undefined)
|
|
{
|
|
finish = true;
|
|
}
|
|
else
|
|
{
|
|
const filterResult = messageFilter(packet.message as T);
|
|
if (filterResult === FilterResponse.Finish)
|
|
{
|
|
finish = true;
|
|
}
|
|
else if (filterResult === FilterResponse.Match)
|
|
{
|
|
// Extend
|
|
if (handleObj.timeout !== null)
|
|
{
|
|
clearTimeout(handleObj.timeout);
|
|
}
|
|
handleObj.timeout = setTimeout(timeoutFunc, timeout);
|
|
}
|
|
}
|
|
}
|
|
if (finish)
|
|
{
|
|
if (handleObj.timeout !== null)
|
|
{
|
|
clearTimeout(handleObj.timeout);
|
|
handleObj.timeout = null;
|
|
}
|
|
if (handleObj.subscription !== null)
|
|
{
|
|
handleObj.subscription.unsubscribe();
|
|
handleObj.subscription = null;
|
|
}
|
|
resolve(packet.message as T);
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
sendPacket(packet: Packet): void
|
|
{
|
|
if (packet.packetFlags & PacketFlags.Reliable)
|
|
{
|
|
this.awaitingAck[packet.sequenceNumber] =
|
|
{
|
|
packet: packet,
|
|
timeout: setTimeout(this.resend.bind(this, packet.sequenceNumber), 1000),
|
|
sent: new Date().getTime()
|
|
};
|
|
}
|
|
let dataToSend: Buffer = Buffer.allocUnsafe(packet.getSize());
|
|
dataToSend = packet.writeToBuffer(dataToSend, 0);
|
|
if (this.client !== null)
|
|
{
|
|
this.client.send(dataToSend, 0, dataToSend.length, this.port, this.ipAddress, (_err, _bytes) =>
|
|
{
|
|
|
|
})
|
|
}
|
|
else
|
|
{
|
|
console.error('Attempted to send packet but UDP client is null');
|
|
}
|
|
}
|
|
|
|
ackReceived(sequenceNumber: number): void
|
|
{
|
|
if (this.awaitingAck[sequenceNumber])
|
|
{
|
|
clearTimeout(this.awaitingAck[sequenceNumber].timeout);
|
|
delete this.awaitingAck[sequenceNumber];
|
|
}
|
|
this.onAckReceived.next(sequenceNumber);
|
|
}
|
|
|
|
sendAck(sequenceNumber: number): void
|
|
{
|
|
const msg: PacketAckMessage = new PacketAckMessage();
|
|
msg.Packets = [
|
|
{
|
|
ID: sequenceNumber
|
|
}
|
|
];
|
|
this.sendMessage(msg, 0);
|
|
}
|
|
|
|
getOldestUnacked(): number
|
|
{
|
|
let result = 0;
|
|
let oldest = -1;
|
|
|
|
const keys: string[] = Object.keys(this.awaitingAck);
|
|
|
|
for (const seqID of keys)
|
|
{
|
|
const nSeq = parseInt(seqID, 10);
|
|
if (oldest === -1 || this.awaitingAck[nSeq].sent < oldest)
|
|
{
|
|
result = nSeq;
|
|
oldest = this.awaitingAck[nSeq].sent;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
expireReceivedPacket(sequenceNumber: number): void
|
|
{
|
|
// Enough time has elapsed that we can forget about this packet
|
|
if (this.receivedPackets[sequenceNumber])
|
|
{
|
|
delete this.receivedPackets[sequenceNumber];
|
|
}
|
|
}
|
|
|
|
receivedPacket(bytes: Buffer): void
|
|
{
|
|
const packet = new Packet();
|
|
try
|
|
{
|
|
packet.readFromBuffer(bytes, 0, this.ackReceived.bind(this), this.sendAck.bind(this));
|
|
}
|
|
catch (erro)
|
|
{
|
|
console.error(erro);
|
|
return;
|
|
}
|
|
|
|
if (this.receivedPackets[packet.sequenceNumber])
|
|
{
|
|
clearTimeout(this.receivedPackets[packet.sequenceNumber]);
|
|
this.receivedPackets[packet.sequenceNumber] = setTimeout(this.expireReceivedPacket.bind(this, packet.sequenceNumber), 10000);
|
|
this.sendAck(packet.sequenceNumber);
|
|
return;
|
|
}
|
|
this.receivedPackets[packet.sequenceNumber] = setTimeout(this.expireReceivedPacket.bind(this, packet.sequenceNumber), 10000);
|
|
|
|
// console.log('<--- ' + packet.message.name);
|
|
|
|
if (packet.message.id === Message.PacketAck)
|
|
{
|
|
const msg = packet.message as PacketAckMessage;
|
|
for (const obj of msg.Packets)
|
|
{
|
|
this.ackReceived(obj.ID);
|
|
}
|
|
}
|
|
else if (packet.message.id === Message.StartPingCheck)
|
|
{
|
|
const msg = packet.message as StartPingCheckMessage;
|
|
const reply: CompletePingCheckMessage = new CompletePingCheckMessage();
|
|
reply.PingID = {
|
|
PingID: msg.PingID.PingID
|
|
};
|
|
this.sendMessage(reply, 0);
|
|
}
|
|
this.onPacketReceived.next(packet);
|
|
}
|
|
}
|