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import { ConnectFailedException, ConnectionLostException, SocketException } from "./LocalExceptions.js";
import { WSConnectionInfo, TCPConnectionInfo } from "./Connection.js";
import { ConnectionInfo as SSLConnectionInfo } from "./SSL/ConnectionInfo.js";
import { SocketOperation } from "./SocketOperation.js";
import { Timer } from "./Timer.js";
//
// With Chrome we don't want to close the socket while connection is in progress,
// see comments on close implementation below.
//
// We need to check for Edge browser as it might include Chrome in its user agent.
//
const IsChrome = navigator.userAgent.indexOf("Edge/") === -1 && navigator.userAgent.indexOf("Chrome/") !== -1;
const IsSafari = /^((?!chrome).)*safari/i.test(navigator.userAgent);
const StateNeedConnect = 0;
const StateConnectPending = 1;
const StateConnected = 2;
const StateClosePending = 3;
const StateClosed = 4;
class WSTransceiver {
constructor(instance, secure, addr, resource) {
this._readBuffers = [];
this._readPosition = 0;
this._maxSendPacketSize = instance.properties().getPropertyAsIntWithDefault("Ice.TCP.SndSize", 512 * 1024);
this._writeReadyTimeout = 0;
let url = secure ? "wss" : "ws";
url += "://" + addr.host;
if (addr.port !== 80) {
url += ":" + addr.port;
}
url += resource ? resource : "/";
this._url = url;
this._fd = null;
this._addr = addr;
this._desc = "local address = <not available>\nremote address = " + addr.host + ":" + addr.port;
this._state = StateNeedConnect;
this._secure = secure;
this._exception = null;
}
writeReadyTimeout() {
const t = Math.round(this._writeReadyTimeout);
this._writeReadyTimeout += this._writeReadyTimeout >= 5 ? 5 : 0.2;
return Math.min(t, 25);
}
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 = new WebSocket(this._url, "ice.zeroc.com");
this._fd.binaryType = "arraybuffer";
this._fd.onopen = e => this.socketConnected(e);
this._fd.onmessage = e => this.socketBytesAvailable(e.data);
this._fd.onclose = e => this.socketClosed(e);
return SocketOperation.Connect; // Waiting for connect to complete.
} else if (this._state === StateConnectPending) {
//
// Socket is connected.
//
this._desc = fdToString(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() {
//
// Register the socket data listener.
//
this._registered = true;
if (this._hasBytesAvailable || this._exception) {
this._hasBytesAvailable = false;
Timer.setTimeout(() => this._bytesAvailableCallback(), 0);
}
}
unregister() {
//
// Unregister the socket data listener.
//
this._registered = false;
}
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;
}
//
// With Chrome (in particular on macOS) calling close() while the websocket isn't
// connected yet doesn't abort the connection attempt, and might result in the
// connection being reused by a different web socket.
//
// To workaround this problem, we always wait for the socket to be connected or
// closed before closing the socket.
//
// NOTE: when this workaround is no longer necessary, don't forget removing the
// StateClosePending state.
//
if ((IsChrome || IsSafari) && this._fd.readyState === WebSocket.CONNECTING) {
this._state = StateClosePending;
return;
}
try {
this._state = StateClosed;
this._fd.close();
} catch (ex) {
throw translateError(this._state, ex);
} finally {
this._fd = null;
}
}
destroy() {}
/**
* Write the given byte buffer to the web socket. The buffer is written using multiple web socket send calls.
*
* @param byteBuffer the byte buffer to write.
* @returns Whether or not the write completed synchronously.
*/
write(byteBuffer) {
if (this._exception) {
throw this._exception;
} else if (byteBuffer.remaining === 0) {
return true;
}
console.assert(this._fd);
const cb = () => {
if (this._fd) {
const packetSize =
this._maxSendPacketSize > 0 && byteBuffer.remaining > this._maxSendPacketSize
? this._maxSendPacketSize
: byteBuffer.remaining;
if (this._fd.bufferedAmount + packetSize <= this._maxSendPacketSize) {
this._bytesWrittenCallback();
} else {
Timer.setTimeout(cb, this.writeReadyTimeout());
}
}
};
while (true) {
const packetSize =
this._maxSendPacketSize > 0 && byteBuffer.remaining > this._maxSendPacketSize
? this._maxSendPacketSize
: byteBuffer.remaining;
if (byteBuffer.remaining === 0) {
break;
}
console.assert(packetSize > 0);
if (this._fd.bufferedAmount + packetSize > this._maxSendPacketSize) {
Timer.setTimeout(cb, this.writeReadyTimeout());
return false;
}
this._writeReadyTimeout = 0;
const slice = byteBuffer.b.slice(byteBuffer.position, byteBuffer.position + packetSize);
this._fd.send(slice);
byteBuffer.position += packetSize;
// WORKAROUND for Safari issue. The websocket accepts all the data (bufferedAmount is always 0). We
// relinquish the control here to ensure timeouts work properly.
if (IsSafari && byteBuffer.remaining > 0) {
Timer.setTimeout(cb, this.writeReadyTimeout());
return false;
}
}
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].byteLength - this._readPosition;
console.assert(avail > 0);
while (byteBuffer.remaining > 0) {
if (avail > byteBuffer.remaining) {
avail = byteBuffer.remaining;
}
new Uint8Array(byteBuffer.b).set(
new Uint8Array(this._readBuffers[0], this._readPosition, avail),
byteBuffer.position,
);
byteBuffer.position += avail;
this._readPosition += avail;
if (this._readPosition === this._readBuffers[0].byteLength) {
//
// 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].byteLength;
}
}
}
moreData.value = this._readBuffers.length > 0;
return byteBuffer.remaining === 0;
}
type() {
return this._secure ? "wss" : "ws";
}
getInfo(adapterName, connectionId) {
console.assert(this._fd !== null);
let info = new TCPConnectionInfo(
adapterName,
connectionId,
"",
-1,
this._addr.host,
this._addr.port,
this._maxSendPacketSize,
);
if (this._secure) {
info = new SSLConnectionInfo(info);
}
return new WSConnectionInfo(info);
}
setBufferSize(_, sndSize) {
this._maxSendPacketSize = sndSize;
}
toString() {
return this._desc;
}
socketConnected() {
if (this._state == StateClosePending) {
this.close();
return;
}
console.assert(this._connectedCallback !== null);
this._connectedCallback();
}
socketBytesAvailable(buf) {
console.assert(this._bytesAvailableCallback !== null);
if (buf.byteLength > 0) {
this._readBuffers.push(buf);
if (this._registered) {
this._bytesAvailableCallback();
} else if (!this._hasBytesAvailable) {
this._hasBytesAvailable = true;
}
}
}
socketClosed(err) {
if (this._state == StateClosePending) {
this.close();
return;
}
this._exception = translateError(this._state, err);
if (this._state < StateConnected) {
this._connectedCallback();
} else if (this._registered) {
this._bytesAvailableCallback();
}
}
}
function fdToString(address) {
return "local address = <not available>\nremote address = " + address.host + ":" + address.port;
}
function translateError(state, err) {
if (state < StateConnected) {
return new ConnectFailedException("connect failed", { cause: err });
} else {
if (err.code === 1000 || err.code === 1006) {
// CLOSE_NORMAL | CLOSE_ABNORMAL
return new ConnectionLostException();
}
return new SocketException("socket exception", { cause: err });
}
}
export { WSTransceiver };
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