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import { TCPConnectionInfo } from "./Connection.js";
import { SocketOperation } from "./SocketOperation.js";
import { Timer } from "./Timer.js";
import {
ConnectionLostException,
ConnectionRefusedException,
ConnectFailedException,
SocketException,
} from "./LocalExceptions.js";
import net from "net";
const StateNeedConnect = 0;
const StateConnectPending = 1;
const StateConnected = 2;
class TcpTransceiver {
constructor(instance, addr, sourceAddr) {
this._logger = instance.logger();
this._readBuffers = [];
this._readPosition = 0;
this._maxSendPacketSize = instance.properties().getPropertyAsIntWithDefault("Ice.TCP.SndSize", 512 * 1024);
this._fd = null;
this._addr = addr;
this._sourceAddr = sourceAddr;
this._desc = "local address = <not connected>\nremote address = " + addr.host + ":" + addr.port;
this._state = StateNeedConnect;
this._registered = false;
this._exception = null;
}
setCallbacks(connectedCallback, bytesAvailableCallback, bytesWrittenCallback) {
this._connectedCallback = connectedCallback;
this._bytesAvailableCallback = bytesAvailableCallback;
this._bytesWrittenCallback = bytesWrittenCallback;
}
//
// Returns SocketOperation.None when initialization is complete.
//
initialize() {
try {
if (this._exception) {
throw this._exception;
}
if (this._state === StateNeedConnect) {
this._state = StateConnectPending;
this._fd = net.createConnection({
port: this._addr.port,
host: this._addr.host,
localAddress: this._sourceAddr,
});
this._fd.on("connect", () => this.socketConnected());
this._fd.on("data", buf => this.socketBytesAvailable(buf));
//
// The error callback can be triggered from the socket
// write(). We don't want it to be dispatched right away
// from within the write() so we delay the call with
// setImmediate. We do the same for close as a
// precaution. See also issue #6226.
//
this._fd.on("close", err => Timer.setImmediate(() => this.socketClosed(err)));
this._fd.on("error", err => Timer.setImmediate(() => this.socketError(err)));
return SocketOperation.Connect; // Waiting for connect to complete.
} else if (this._state === StateConnectPending) {
//
// Socket is connected.
//
this._desc = fdToString(this._fd, this._addr);
this._state = StateConnected;
}
} catch (err) {
if (!this._exception) {
this._exception = translateError(this._state, err);
}
throw this._exception;
}
console.assert(this._state === StateConnected);
return SocketOperation.None;
}
register() {
this._registered = true;
this._fd.resume();
if (this._exception) {
this._bytesAvailableCallback();
}
}
unregister() {
if (this._fd === null) {
console.assert(this._exception); // Socket creation failed.
return;
}
this._registered = false;
this._fd.pause();
}
close() {
if (this._fd === null) {
// Socket creation failed or not yet initialized, the later can happen if the connection creation throws
// before calling transceiver initialize.
return;
}
this._fd.end();
}
destroy() {
if (this._fd === null) {
// Socket creation failed or not yet initialized, the later can happen if the connection creation throws
// before calling transceiver initialize.
return;
}
try {
this._fd.destroy();
} catch (ex) {
throw translateError(this._state, ex);
} finally {
this._fd = null;
}
}
/**
* Write the given byte buffer to the socket. The buffer is written using multiple socket write calls.
*
* @param byteBuffer the byte buffer to write.
* @returns Whether or not the write operation completed synchronously.
*/
write(byteBuffer) {
if (this._exception) {
throw this._exception;
}
let packetSize = byteBuffer.remaining;
console.assert(packetSize > 0);
if (this._maxSendPacketSize > 0 && packetSize > this._maxSendPacketSize) {
packetSize = this._maxSendPacketSize;
}
while (packetSize > 0) {
const slice = byteBuffer.b.slice(byteBuffer.position, byteBuffer.position + packetSize);
let sync = true;
sync = this._fd.write(Buffer.from(slice), null, () => {
if (!sync) {
this._bytesWrittenCallback();
}
});
byteBuffer.position += packetSize;
if (!sync) {
return false; // Wait for callback to be called before sending more data.
}
if (this._maxSendPacketSize > 0 && byteBuffer.remaining > this._maxSendPacketSize) {
packetSize = this._maxSendPacketSize;
} else {
packetSize = byteBuffer.remaining;
}
}
return true;
}
read(byteBuffer, moreData) {
if (this._exception) {
throw this._exception;
}
moreData.value = false;
if (this._readBuffers.length === 0) {
return false; // No data available.
}
let avail = this._readBuffers[0].length - this._readPosition;
console.assert(avail > 0);
while (byteBuffer.remaining > 0) {
if (avail > byteBuffer.remaining) {
avail = byteBuffer.remaining;
}
this._readBuffers[0].copy(
Buffer.from(byteBuffer.b),
byteBuffer.position,
this._readPosition,
this._readPosition + avail,
);
byteBuffer.position += avail;
this._readPosition += avail;
if (this._readPosition === this._readBuffers[0].length) {
//
// We've exhausted the current read buffer.
//
this._readPosition = 0;
this._readBuffers.shift();
if (this._readBuffers.length === 0) {
break; // No more data - we're done.
} else {
avail = this._readBuffers[0].length;
}
}
}
moreData.value = this._readBuffers.length > 0;
return byteBuffer.remaining === 0;
}
type() {
return "tcp";
}
getInfo(adapterName, connectionId) {
console.assert(this._fd !== null);
return new TCPConnectionInfo(
adapterName,
connectionId,
this._fd.localAddress,
this._fd.localPort,
this._fd.remoteAddress,
this._fd.remotePort,
this._maxSendPacketSize,
);
}
setBufferSize(_, sndSize) {
this._maxSendPacketSize = sndSize;
}
toString() {
return this._desc;
}
socketConnected() {
console.assert(this._connectedCallback !== null);
this._connectedCallback();
}
socketBytesAvailable(buf) {
console.assert(this._bytesAvailableCallback !== null);
//
// TODO: Should we set a limit on how much data we can read?
// We can call _fd.pause() to temporarily stop reading.
//
if (buf.length > 0) {
this._readBuffers.push(buf);
this._bytesAvailableCallback();
}
}
socketClosed(err) {
//
// Don't call the closed callback if an error occurred; the error callback
// will be called.
//
if (!err) {
this.socketError(null);
}
}
socketError(err) {
this._exception = translateError(this._state, err);
if (this._state < StateConnected) {
this._connectedCallback();
} else if (this._registered) {
this._bytesAvailableCallback();
}
}
}
function fdToString(fd, targetAddr) {
if (fd === null) {
return "<closed>";
}
return addressesToString(fd.localAddress, fd.localPort, fd.remoteAddress, fd.remotePort, targetAddr);
}
function translateError(state, err) {
if (!err) {
return new ConnectionLostException();
} else if (state < StateConnected) {
if (connectionRefused(err.code)) {
return new ConnectionRefusedException("connection refused", { cause: err });
} else if (connectionFailed(err.code)) {
return new ConnectFailedException("connect failed", { cause: err });
}
} else if (connectionLost(err.code)) {
return new ConnectionLostException("connection lost", { cause: err });
}
return new SocketException("socket exception", { cause: err });
}
function addressesToString(localHost, localPort, remoteHost, remotePort, targetAddr) {
remoteHost = remoteHost === undefined ? null : remoteHost;
targetAddr = targetAddr === undefined ? null : targetAddr;
const s = [];
s.push("local address = ");
s.push(localHost + ":" + localPort);
if (remoteHost === null && targetAddr !== null) {
remoteHost = targetAddr.host;
remotePort = targetAddr.port;
}
if (remoteHost === null) {
s.push("\nremote address = <not connected>");
} else {
s.push("\nremote address = ");
s.push(remoteHost + ":" + remotePort);
}
return s.join("");
}
const ECONNABORTED = "ECONNABORTED";
const ECONNREFUSED = "ECONNREFUSED";
const ECONNRESET = "ECONNRESET";
const EHOSTUNREACH = "EHOSTUNREACH";
const ENETUNREACH = "ENETUNREACH";
const ENOTCONN = "ENOTCONN";
const EPIPE = "EPIPE";
const ESHUTDOWN = "ESHUTDOWN";
const ETIMEDOUT = "ETIMEDOUT";
function connectionRefused(err) {
return err == ECONNREFUSED;
}
function connectionFailed(err) {
return (
err == ECONNREFUSED ||
err == ETIMEDOUT ||
err == ENETUNREACH ||
err == EHOSTUNREACH ||
err == ECONNRESET ||
err == ESHUTDOWN ||
err == ECONNABORTED
);
}
function connectionLost(err) {
return err == ECONNRESET || err == ENOTCONN || err == ESHUTDOWN || err == ECONNABORTED || err == EPIPE;
}
export { TcpTransceiver };
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