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import { LocalException } from "./LocalException.js";
import {
ObjectAdapterDestroyedException,
CommunicatorDestroyedException,
CloseConnectionException,
ConnectionAbortedException,
ConnectionClosedException,
ConnectTimeoutException,
ConnectionLostException,
CloseTimeoutException,
FeatureNotSupportedException,
MarshalException,
UnknownException,
ObjectNotExistException,
ProtocolException,
} from "./LocalExceptions.js";
import { BatchRequestQueue } from "./BatchRequestQueue.js";
import { InputStream } from "./InputStream.js";
import { OutputStream } from "./OutputStream.js";
import { Protocol } from "./Protocol.js";
import { Ice as Ice_Version } from "./Version.js";
const { ProtocolVersion, EncodingVersion } = Ice_Version;
import { throwMemoryLimitException } from "./ExUtil.js";
import { Timer } from "./Timer.js";
import { Promise } from "./Promise.js";
import { SocketOperation } from "./SocketOperation.js";
import { TraceUtil } from "./TraceUtil.js";
import { AsyncStatus } from "./AsyncStatus.js";
import { RetryException } from "./RetryException.js";
import { ConnectionFlushBatch, OutgoingAsync } from "./OutgoingAsync.js";
import { IdleTimeoutTransceiverDecorator } from "./IdleTimeoutTransceiverDecorator.js";
import { ObjectAdapter } from "./ObjectAdapter.js";
import { ObjectPrx } from "./ObjectPrx.js";
import { IncomingRequest } from "./IncomingRequest.js";
import "./CurrentExtensions.js";
const StateNotInitialized = 0;
const StateNotValidated = 1;
const StateActive = 2;
// StateHolding is a very transient state in JS: the connection is in StateHolding once the connection establishment
// has succeeded and until the outgoing connection factory activates the connection - which is essentially immediate.
const StateHolding = 3;
const StateClosing = 4;
const StateClosingPending = 5;
const StateClosed = 6;
const StateFinished = 7;
function scheduleCloseTimeout(connection) {
if (connection._closeTimeout > 0 && connection._closeTimeoutId === undefined) {
// Schedules a one-time check.
connection._closeTimeoutId = connection._timer.schedule(
() => connection.closeTimedOut(),
connection._closeTimeout,
);
}
}
export class ConnectionI {
constructor(communicator, instance, transceiver, endpoint, adapter, removeFromFactory, options) {
this._communicator = communicator;
this._instance = instance;
this._desc = transceiver.toString();
this._type = transceiver.type();
this._endpoint = endpoint;
this._adapter = adapter;
this._removeFromFactory = removeFromFactory;
this._connectTimeout = options.connectTimeout * 1000; // Seconds to milliseconds
this._connectTimeoutId = undefined;
this._closeTimeout = options.closeTimeout * 1000; // Seconds to milliseconds.
this._closeTimeoutId = undefined;
this._inactivityTimeout = options.inactivityTimeout;
this._inactivityTimer = undefined;
const initData = instance.initializationData();
this._logger = initData.logger; // Cached for better performance.
this._traceLevels = instance.traceLevels(); // Cached for better performance.
this._timer = instance.timer();
this._hasMoreData = { value: false };
this._warn = initData.properties.getIcePropertyAsInt("Ice.Warn.Connections") > 0;
this._nextRequestId = 1;
this._messageSizeMax = instance.messageSizeMax();
this._batchRequestQueue = new BatchRequestQueue(instance);
this._sendStreams = [];
this._readStream = new InputStream(instance, Protocol.currentProtocolEncoding);
this._readHeader = false;
this._writeStream = new OutputStream(); // temporary stream
this._readStreamPos = -1;
this._writeStreamPos = -1;
// The number of user calls currently executed by the event-loop (servant dispatch, invocation response, etc.).
this._upcallCount = 0;
// The number of outstanding dispatches. Maintained only while state is StateActive.
this._dispatchCount = 0;
this._state = StateNotInitialized;
this._shutdownInitiated = false;
this._initialized = false;
this._validated = false;
this._asyncRequests = new Map(); // Map<int, OutgoingAsync>
this._exception = null;
this._startPromise = null;
this._closed = undefined;
this._finishedPromises = [];
if (options.idleTimeout > 0) {
transceiver = new IdleTimeoutTransceiverDecorator(
transceiver,
this,
this._timer,
options.idleTimeout,
options.enableIdleCheck,
);
}
this._transceiver = transceiver;
this._closeCallback = null;
}
start() {
console.assert(this._startPromise === null);
try {
// The connection might already be closed if the communicator was destroyed.
if (this._state >= StateClosed) {
console.assert(this._exception !== null);
return Promise.reject(this._exception);
}
this._startPromise = new Promise();
this._transceiver.setCallbacks(
() => this.message(SocketOperation.Write), // connected callback
() => this.message(SocketOperation.Read), // read callback
() => this.message(SocketOperation.Write), // write callback
);
if (!this.initialize()) {
if (this._connectTimeout > 0) {
this._connectTimeoutId = this._timer.schedule(() => {
this.connectTimedOut();
}, this._connectTimeout);
}
}
} catch (ex) {
const startPromise = this._startPromise;
this.exception(ex);
return startPromise;
}
return this._startPromise;
}
activate() {
if (this._state <= StateNotValidated) {
return;
}
this.setState(StateActive);
}
destroy() {
// Called by Communicator.destroy
this.setState(StateClosing, new CommunicatorDestroyedException());
}
abort() {
this.setState(
StateClosed,
new ConnectionAbortedException("The connection was aborted by the application.", true),
);
}
close() {
if (this._closed === undefined) {
this._closed = new Promise();
scheduleCloseTimeout(this);
if (this._asyncRequests.size === 0) {
this.doApplicationClose();
}
}
return this._closed;
}
doApplicationClose() {
console.assert(this._state < StateClosing);
this.setState(
StateClosing,
new ConnectionClosedException("The connection was closed gracefully by the application.", true),
);
}
isActiveOrHolding() {
return this._state > StateNotValidated && this._state < StateClosing;
}
throwException() {
if (this._exception !== null) {
console.assert(this._state >= StateClosing);
throw this._exception;
}
}
waitUntilFinished() {
const promise = new Promise();
this._finishedPromises.push(promise);
this.checkState();
return promise;
}
sendAsyncRequest(out, response, batchRequestNum) {
let requestId = 0;
const ostr = out.getOs();
if (this._exception !== null) {
// If the connection is closed before we even have a chance to send our request, we always try to send the
// request again.
throw new RetryException(this._exception);
}
console.assert(this._state > StateNotValidated);
console.assert(this._state < StateClosing);
// Notify the request that it's cancelable with this connection. This will throw if the request is canceled.
out.cancelable(this);
if (response) {
// Create a new unique request ID.
requestId = this._nextRequestId++;
if (requestId <= 0) {
this._nextRequestId = 1;
requestId = this._nextRequestId++;
}
// Fill in the request ID.
ostr.pos = Protocol.headerSize;
ostr.writeInt(requestId);
} else if (batchRequestNum > 0) {
ostr.pos = Protocol.headerSize;
ostr.writeInt(batchRequestNum);
}
// We're just about to send a request, so we are not inactive anymore.
this.cancelInactivityTimer();
let status;
try {
status = this.sendMessage(OutgoingMessage.create(out, out.getOs(), requestId));
} catch (ex) {
if (ex instanceof LocalException) {
this.setState(StateClosed, ex);
console.assert(this._exception !== null);
throw this._exception;
} else {
throw ex;
}
}
if (response) {
// Add the request to the async requests map.
this._asyncRequests.set(requestId, out);
}
return status;
}
getBatchRequestQueue() {
return this._batchRequestQueue;
}
flushBatchRequests() {
const result = new ConnectionFlushBatch(this, this._communicator, "flushBatchRequests");
result.invoke();
return result;
}
setCloseCallback(callback) {
if (this._state >= StateClosed) {
if (callback !== null) {
Timer.setImmediate(() => {
try {
callback(this);
} catch (ex) {
this._logger.error(`connection callback exception:\n${ex}\n${ex.stack}\n${this._desc}`);
}
});
}
} else {
this._closeCallback = callback;
}
}
disableInactivityCheck() {
this.cancelInactivityTimer();
this._inactivityTimeout = 0;
}
asyncRequestCanceled(outAsync, ex) {
for (let i = 0; i < this._sendStreams.length; i++) {
const o = this._sendStreams[i];
if (o.outAsync === outAsync) {
if (o.requestId > 0) {
this._asyncRequests.delete(o.requestId);
}
// If the request is being sent, don't remove it from the send streams, it will be removed once the
// sending is finished.
o.canceled();
if (i !== 0) {
this._sendStreams.splice(i, 1);
}
outAsync.completedEx(ex);
if (this._closed !== undefined && this._state < StateClosing && this._asyncRequests.size === 0) {
this.doApplicationClose();
}
return; // We're done.
}
}
if (outAsync instanceof OutgoingAsync) {
for (const [key, value] of this._asyncRequests) {
if (value === outAsync) {
this._asyncRequests.delete(key);
outAsync.completedEx(ex);
if (this._closed !== undefined && this._state < StateClosing && this._asyncRequests.size === 0) {
this.doApplicationClose();
}
return; // We're done.
}
}
}
}
sendResponse(response, isTwoWay) {
console.assert(this._state > StateNotValidated);
try {
if (--this._upcallCount === 0) {
if (this._state === StateFinished) {
this._removeFromFactory(this);
}
this.checkState();
}
if (this._state >= StateClosed) {
console.assert(this._exception !== null);
throw this._exception;
}
if (isTwoWay) {
this.sendMessage(OutgoingMessage.createForStream(response.outputStream));
}
--this._dispatchCount;
if (this._state === StateClosing && this._upcallCount === 0) {
this.initiateShutdown();
}
} catch (ex) {
if (ex instanceof LocalException) {
this.setState(StateClosed, ex);
} else {
throw ex;
}
}
}
endpoint() {
return this._endpoint;
}
setAdapter(adapter) {
if (adapter !== null) {
adapter.checkForDestruction();
if (this._state <= StateNotValidated || this._state >= StateClosing) {
return;
}
this._adapter = adapter;
} else {
if (this._state <= StateNotValidated || this._state >= StateClosing) {
return;
}
this._adapter = null;
}
}
getAdapter() {
return this._adapter;
}
getEndpoint() {
return this._endpoint;
}
createProxy(ident) {
ObjectAdapter.checkIdentity(ident);
return new ObjectPrx(this._instance.referenceFactory().createFixed(ident, this));
}
message(operation) {
if (this._state >= StateClosed) {
return;
}
// Keep reading until no more data is available.
this._hasMoreData.value = (operation & SocketOperation.Read) !== 0;
let info = null;
let response = null;
try {
if ((operation & SocketOperation.Write) !== 0) {
if (this._writeStream.buffer.remaining > 0) {
console.assert(this._sendStreams.length > 0);
const completedSynchronously = this.write(this._writeStream.buffer);
if (this._writeStream.buffer.remaining === 0) {
// If the write call consumed the complete buffer, we assume the message is sent now for
// at-most-once semantics.
this._sendStreams[0].isSent = true;
}
if (!completedSynchronously) {
console.assert(!this._writeStream.isEmpty());
return;
}
console.assert(this._writeStream.buffer.remaining === 0);
} else if (this._transceiver instanceof IdleTimeoutTransceiverDecorator) {
// The writing of the current message completed, schedule a heartbeat in case the connection has
// nothing more to write.
this._transceiver.scheduleHeartbeat();
}
}
if ((operation & SocketOperation.Read) !== 0 && !this._readStream.isEmpty()) {
if (this._readHeader) {
// Read header if necessary.
if (!this.read(this._readStream.buffer)) {
// We didn't get enough data to complete the header.
return;
}
console.assert(this._readStream.buffer.remaining === 0);
this._readHeader = false;
// Connection is validated on first message. This is only used by setState() to check whether or not
// we can print a connection warning (a client might close the connection forcefully if the
// connection isn't validated, we don't want to print a warning in this case).
this._validated = true;
const pos = this._readStream.pos;
console.assert(pos >= Protocol.headerSize);
this._readStream.pos = 0;
const magic0 = this._readStream.readByte();
const magic1 = this._readStream.readByte();
const magic2 = this._readStream.readByte();
const magic3 = this._readStream.readByte();
if (
magic0 !== Protocol.magic[0] ||
magic1 !== Protocol.magic[1] ||
magic2 !== Protocol.magic[2] ||
magic3 !== Protocol.magic[3]
) {
throw new ProtocolException(
`Bad magic in message header: ${magic0.toString(16)} ${magic1.toString(16)} ${magic2.toString(16)} ${magic3.toString(16)}`,
);
}
const protocolVersion = new ProtocolVersion();
protocolVersion._read(this._readStream);
if (
protocolVersion.major != Protocol.currentProtocol.major ||
protocolVersion.minor != Protocol.currentProtocol.minor
) {
throw new MarshalException(
`Invalid protocol version in message header: ${protocolVersion.major}.${protocolVersion.minor}`,
);
}
const encodingVersion = new EncodingVersion();
encodingVersion._read(this._readStream);
if (
encodingVersion.major != Protocol.currentProtocolEncoding.major ||
protocolVersion.minor != Protocol.currentProtocolEncoding.minor
) {
throw new MarshalException(
`Invalid protocol encoding version in message header: ${encodingVersion.major}.${encodingVersion.minor}`,
);
}
this._readStream.readByte(); // messageType
this._readStream.readByte(); // compress
const size = this._readStream.readInt();
if (size < Protocol.headerSize) {
throw new MarshalException(`Received Ice message with unexpected size ${size}.`);
}
if (size > this._messageSizeMax) {
throwMemoryLimitException(size, this._messageSizeMax);
}
if (size > this._readStream.size) {
this._readStream.resize(size);
}
this._readStream.pos = pos;
}
if (this._readStream.pos != this._readStream.size) {
if (!this.read(this._readStream.buffer)) {
console.assert(!this._readStream.isEmpty());
return;
}
console.assert(this._readStream.buffer.remaining === 0);
}
}
if (this._state <= StateNotValidated) {
if (this._state === StateNotInitialized && !this.initialize()) {
return;
}
if (this._state <= StateNotValidated && !this.validate()) {
return;
}
// We start out in holding state.
this.setState(StateHolding);
if (this._startPromise !== null) {
++this._upcallCount;
}
} else {
console.assert(this._state <= StateClosingPending);
// We parse messages first, if we receive a close connection message we won't send more messages.
if ((operation & SocketOperation.Read) !== 0) {
info = this.parseMessage();
}
if ((operation & SocketOperation.Write) !== 0) {
response = this.sendNextMessage();
if (response !== null) {
// The first message in the send queue was a request with a response waiting until the message
// was marked as sent.
++this._upcallCount;
}
}
}
} catch (ex) {
this.setState(StateClosed, ex);
return;
}
this.upcall(info, response);
if (this._hasMoreData.value) {
Timer.setImmediate(() => this.message(SocketOperation.Read)); // Don't tie up the thread.
}
}
upcall(info, response) {
let count = 0;
// Notify the factory that the connection establishment and validation has completed.
if (this._startPromise !== null) {
this._startPromise.resolve();
this._startPromise = null;
++count;
}
if (response != null) {
// A response to a request which was delayed until the request was marked as sent.
response.outAsync.completed(response.stream);
++count;
}
if (info !== null) {
if (info.outAsync !== null) {
info.outAsync.completed(info.stream);
++count;
}
if (info.requestCount > 0) {
this.dispatchAll(info.stream, info.requestCount, info.requestId, info.adapter);
// Don't increase count, the dispatch count is decreased when the incoming reply is sent.
}
}
// Decrease the upcall count.
if (count > 0) {
this._upcallCount -= count;
if (this._upcallCount === 0) {
if (this._state === StateClosing) {
try {
this.initiateShutdown();
} catch (ex) {
if (ex instanceof LocalException) {
this.setState(StateClosed, ex);
} else {
throw ex;
}
}
} else if (this._state === StateFinished) {
this._removeFromFactory(this);
}
this.checkState();
}
}
}
finish() {
console.assert(this._state === StateClosed);
// Cancel the timers to ensure they don't keep the event loop alive.
if (this._connectTimeoutId !== undefined) {
this._timer.cancel(this._connectTimeoutId);
}
if (this._closeTimeoutId !== undefined) {
this._timer.cancel(this._closeTimeoutId);
this._closeTimeoutId = undefined;
}
const traceLevels = this._traceLevels;
if (!this._initialized) {
if (traceLevels.network >= 2) {
this._logger.trace(
traceLevels.networkCat,
`failed to establish ${this._endpoint.protocol()} connection\n${this}\n${this._exception}`,
);
}
} else if (traceLevels.network >= 1) {
let s = `closed ${this._endpoint.protocol()} connection\n${this}`;
// Trace the cause of most connection closures
if (
!(
this._exception instanceof CommunicatorDestroyedException ||
this._exception instanceof ObjectAdapterDestroyedException
)
) {
s += `\n${this._exception}`;
}
this._logger.trace(traceLevels.networkCat, s);
}
if (this._startPromise !== null) {
this._startPromise.reject(this._exception);
this._startPromise = null;
}
if (this._sendStreams.length > 0) {
if (!this._writeStream.isEmpty()) {
// Return the stream to the outgoing call. This is important for retriable AMI calls, which are not
// marshaled again.
const message = this._sendStreams[0];
this._writeStream.swap(message.stream);
// The current message might have been sent but not yet removed from _sendStreams. We mark it as sent
// and remove it from _sendStreams to avoid calling finish on a message that has already been processed.
if (message.isSent || message.response !== null) {
message.sent();
if (message.response !== null) {
// If the response has already been received, process it now.
message.outAsync.completed(message.response.stream);
}
this._sendStreams.shift();
}
}
// For two-way requests that are not sent, `finished` may be called twice:
// the first time because the outgoing message is in the `_sendStreams` set, and the second time because
// it's also in the `_asyncRequests` map. This behavior is acceptable; only the first call should be
// processed by the `finished` implementation.
for (const message of this._sendStreams) {
if (message.requestId > 0) {
this._asyncRequests.delete(message.requestId);
}
message.completed(this._exception);
}
this._sendStreams = [];
}
for (const request of this._asyncRequests.values()) {
request.completedEx(this._exception);
}
this._asyncRequests.clear();
// Don't wait to be reaped to reclaim memory allocated by read/write streams.
this._readStream.clear();
this._readStream.buffer.clear();
this._writeStream.clear();
this._writeStream.buffer.clear();
if (this._closed !== undefined) {
if (
this._exception instanceof ConnectionClosedException ||
this._exception instanceof CloseConnectionException ||
this._exception instanceof CommunicatorDestroyedException ||
this._exception instanceof ObjectAdapterDestroyedException
) {
this._closed.resolve();
} else {
console.assert(this._exception !== null);
this._closed.reject(this._exception);
}
}
if (this._closeCallback !== null) {
try {
this._closeCallback(this);
} catch (ex) {
this._logger.error(`connection callback exception:\n${ex}\n${this._desc}`);
}
this._closeCallback = null;
}
// This must be done last as this will cause waitUntilFinished() to return (and communicator objects such as
// the timer might be destroyed too).
if (this._upcallCount === 0) {
this._removeFromFactory(this);
}
this.setState(StateFinished);
}
toString() {
return this._desc;
}
type() {
return this._type;
}
getInfo() {
if (this._state >= StateClosed) {
throw this._exception;
}
return this._transceiver.getInfo(
this._adapter !== null ? this._adapter.getName() : "",
this._endpoint.connectionId(),
);
}
setBufferSize(rcvSize, sndSize) {
if (this._state >= StateClosed) {
throw this._exception;
}
this._transceiver.setBufferSize(rcvSize, sndSize);
}
exception(ex) {
this.setState(StateClosed, ex);
}
dispatchException(ex, requestCount) {
// Fatal exception while invoking a request. Since sendResponse isn't called in case of a fatal exception we
// decrement this._upcallCount here.
this.setState(StateClosed, ex);
if (requestCount > 0) {
console.assert(this._upcallCount > requestCount);
this._upcallCount -= requestCount;
console.assert(this._upcallCount >= 0);
if (this._upcallCount === 0) {
if (this._state === StateFinished) {
this._removeFromFactory(this);
}
this.checkState();
}
}
}
inactivityCheck(inactivityTimer) {
// If the timers are different, it means this inactivityTimer is no longer current.
if (inactivityTimer == this._inactivityTimer) {
this._inactivityTimer = undefined;
inactivityTimer.destroy();
if (this._state == StateActive) {
this.setState(
StateClosing,
new ConnectionClosedException(
"connection closed because it remained inactive for longer than the inactivity timeout",
),
);
}
}
// Else this timer was already canceled and disposed. Nothing to do.
}
setState(state, ex) {
if (ex !== undefined) {
console.assert(ex instanceof LocalException, ex);
// If setState() is called with an exception, then only closed and closing states are permissible.
console.assert(state >= StateClosing);
if (this._state === state) {
// Don't switch twice.
return;
}
if (this._exception === null) {
this._exception = ex;
// We don't warn if we are not validated.
if (this._warn && this._validated) {
// Don't warn about certain expected exceptions.
if (
!(
this._exception instanceof CloseConnectionException ||
this._exception instanceof ConnectionClosedException ||
this._exception instanceof CommunicatorDestroyedException ||
this._exception instanceof ObjectAdapterDestroyedException ||
(this._exception instanceof ConnectionLostException && this._state === StateClosing)
)
) {
this.warning("connection exception", this._exception);
}
}
}
// We must set the new state before we notify requests of any exceptions. Otherwise new requests may retry
// on a connection that is not yet marked as closed or closing.
}
// Skip graceful shutdown if we are destroyed before validation.
if (this._state <= StateNotValidated && state === StateClosing) {
state = StateClosed;
}
if (this._state === state) {
// Don't switch twice.
return;
}
if (state > StateActive) {
// Cancel the inactivity timer, if not null.
this.cancelInactivityTimer();
}
try {
switch (state) {
case StateNotInitialized: {
console.assert(false);
break;
}
case StateNotValidated: {
if (this._state !== StateNotInitialized) {
console.assert(this._state === StateClosed);
return;
}
// Register to receive validation message. Once validation is complete, a new connection starts out
// in the Holding state. We only want to register the transceiver now if we need to receive data in
// order to validate the connection.
this._transceiver.register();
break;
}
case StateActive: {
console.assert(this._state <= StateHolding);
this._transceiver.register();
break;
}
case StateHolding:
console.assert(this._state === StateNotValidated);
this._transceiver.unregister();
break; // see comment on StateHolding definition
case StateClosing:
case StateClosingPending: {
// Can't change back from closing pending.
if (this._state >= StateClosingPending) {
return;
}
break;
}
case StateClosed: {
if (this._state === StateFinished) {
return;
}
this._batchRequestQueue.destroy(this._exception);
this._transceiver.unregister();
this._transceiver.close();
break;
}
case StateFinished: {
console.assert(this._state === StateClosed);
this._transceiver.destroy();
break;
}
default: {
console.assert(false);
break;
}
}
} catch (ex) {
if (ex instanceof LocalException) {
this._logger.error(`unexpected connection exception:\n${this._desc}\n${ex.toString()}`);
} else {
throw ex;
}
}
this._state = state;
if (this._state === StateClosing && this._upcallCount === 0) {
try {
this.initiateShutdown();
} catch (ex) {
if (ex instanceof LocalException) {
this.setState(StateClosed, ex);
} else {
throw ex;
}
}
} else if (this._state === StateClosed) {
this.finish();
}
this.checkState();
}
initiateShutdown() {
console.assert(this._state === StateClosing && this._upcallCount === 0);
if (this._shutdownInitiated) {
return;
}
this._shutdownInitiated = true;
// Before we shut down, we send a close connection message.
const os = new OutputStream(Protocol.currentProtocolEncoding);
os.writeBlob(Protocol.magic);
Protocol.currentProtocol._write(os);
Protocol.currentProtocolEncoding._write(os);
os.writeByte(Protocol.closeConnectionMsg);
os.writeByte(0); // compression status: always report 0 for CloseConnection.
os.writeInt(Protocol.headerSize); // Message size.
scheduleCloseTimeout(this);
if ((this.sendMessage(OutgoingMessage.createForStream(os)) & AsyncStatus.Sent) > 0) {
this.setState(StateClosingPending);
}
}
idleCheck(idleTimeout) {
if (this._state === StateActive || this._state === StateHolding) {
this.setState(
StateClosed,
new ConnectionAbortedException(
`Connection aborted by the idle check because it did not receive any bytes for ${idleTimeout}s.`,
false,
),
);
}
// else nothing to do
}
sendHeartbeat() {
if (this._state === StateActive || this._state === StateHolding || this._state === StateClosing) {
// We check if the connection has become inactive.
if (
this._inactivityTimer === undefined && // timer not already scheduled
this._inactivityTimeout > 0 && // inactivity timeout is enabled
this._state === StateActive && // only schedule the timer if the connection is active
this._dispatchCount === 0 && // no pending dispatch
this._asyncRequests.size === 0 && // no pending invocation
this._readHeader && // we're not waiting for the remainder of an incoming message
this._sendStreams.length <= 1 // there is at most one pending outgoing message
) {
// We may become inactive while the peer is back-pressuring us. In this case, we only schedule the
// inactivity timer if there is no pending outgoing message or the pending outgoing message is a
// heartbeat.
// The stream of the first _sendStreams message is in _writeStream.
if (
this._sendStreams.length === 0 ||
this._writeStream.buffer.getAt(8) === Protocol.validateConnectionMsg
) {
this.scheduleInactivityTimer();
}
}
// We send a heartbeat to the peer to generate a "write" on the connection. This write in turns creates
// a read on the peer, and resets the peer's idle check timer. When _sendStream is not empty, there is
// already an outstanding write, so we don't need to send a heartbeat. It's possible the first message
// of _sendStreams was already sent but not yet removed from _sendStreams: it means the last write
// occurred very recently, which is good enough with respect to the idle check.
// As a result of this optimization, the only possible heartbeat in _sendStreams is the first
// _sendStreams message.
if (this._sendStreams.length === 0) {
const os = new OutputStream(Protocol.currentProtocolEncoding);
os.writeBlob(Protocol.magic);
Protocol.currentProtocol._write(os);
Protocol.currentProtocolEncoding._write(os);
os.writeByte(Protocol.validateConnectionMsg);
os.writeByte(0);
os.writeInt(Protocol.headerSize); // Message size.
try {
this.sendMessage(OutgoingMessage.createForStream(os));
} catch (ex) {
this.setState(StateClosed, ex);
}
}
}
}
initialize() {
const s = this._transceiver.initialize(this._readStream.buffer, this._writeStream.buffer);
if (s != SocketOperation.None) {
return false;
}
// Update the connection description once the transceiver is initialized.
this._desc = this._transceiver.toString();
this._initialized = true;
this.setState(StateNotValidated);
return true;
}
validate() {
if (this._readStream.size === 0) {
this._readStream.resize(Protocol.headerSize);
this._readStream.pos = 0;
}
if (this._readStream.pos !== this._readStream.size && !this.read(this._readStream.buffer)) {
return false;
}
this._validated = true;
console.assert(this._readStream.pos === Protocol.headerSize);
this._readStream.pos = 0;
const m = this._readStream.readBlob(4);
if (
m[0] !== Protocol.magic[0] ||
m[1] !== Protocol.magic[1] ||
m[2] !== Protocol.magic[2] ||
m[3] !== Protocol.magic[3]
) {
throw new ProtocolException(
`Bad magic in message header: ${m[0].toString(16)} ${m[1].toString(16)} ${m[2].toString(16)} ${m[3].toString(16)}`,
);
}
const protocolVersion = new ProtocolVersion();
protocolVersion._read(this._readStream);
if (
protocolVersion.major != Protocol.currentProtocol.major ||
protocolVersion.minor != Protocol.currentProtocol.minor
) {
throw new MarshalException(
`Invalid protocol version in message header: ${protocolVersion.major}.${protocolVersion.minor}`,
);
}
const encodingVersion = new EncodingVersion();
encodingVersion._read(this._readStream);
if (
encodingVersion.major != Protocol.currentProtocolEncoding.major ||
protocolVersion.minor != Protocol.currentProtocolEncoding.minor
) {
throw new MarshalException(
`Invalid protocol encoding version in message header: ${encodingVersion.major}.${encodingVersion.minor}`,
);
}
const messageType = this._readStream.readByte();
if (messageType !== Protocol.validateConnectionMsg) {
throw new ProtocolException(
`Received message of type ${messageType} over a connection that is not yet validated.`,
);
}
this._readStream.readByte(); // Ignore compression status for validate connection.
const size = this._readStream.readInt();
if (size !== Protocol.headerSize) {
throw new MarshalException(`Received ValidateConnection message with unexpected size ${size}.`);
}
TraceUtil.traceRecv(this._readStream, this, this._logger, this._traceLevels);
this._writeStream.resize(0);
this._writeStream.pos = 0;
this._readStream.resize(Protocol.headerSize);
this._readHeader = true;
this._readStream.pos = 0;
const traceLevels = this._traceLevels;
if (traceLevels.network >= 1) {
this._logger.trace(traceLevels.networkCat, `established ${this._endpoint.protocol()} connection\n${this}`);
}
if (this._transceiver instanceof IdleTimeoutTransceiverDecorator) {
// Client connection starts sending heartbeats once it has received the ValidateConnection message.
this._transceiver.scheduleHeartbeat();
}
return true;
}
/**
* Called when the connection is ready to start sending the next message in the send queue. The connection queues
* protocol messages to be sent when the sending cannot complete synchronously or when another protocol message is
* in the process of being sent.
*
* When this method is called, the first message in the send queue (the message currently being sent) has already
* been sent and will be removed from the queue.
*
* This method will continue sending messages until the send queue is empty or until a protocol message cannot be
* sent synchronously.
*
* If the first message in the queue is an outgoing request and its response was received before this method was
* called, the response should be cached in the message's response field and will be returned as the result. The
* caller is then responsible for processing the response, now that the message has been marked as sent.
*
* @returns The response of the first message in the send queue if it has been received; null otherwise.
*/
sendNextMessage() {
let response = null;
console.assert(!this._writeStream.isEmpty() && this._writeStream.pos === this._writeStream.size);
// The first message in the queue has already been sent, notify the message and remove it from the sent queue.
let message = this._sendStreams.shift();
this._writeStream.swap(message.stream);
message.sent();
// If the response for the first message in the queue was received before this method was called, we will return
// the response to the caller to be processed upon return.
if (message.response !== null) {
response = message.response;
}
try {
// Continue sending messages until the send queue is empty, a message cannot be sent synchronously,
// or the connection is closing.
while (this._sendStreams.length > 0 && this._state < StateClosingPending) {
// Prepare the next message stream for writing.
message = this._sendStreams[0];
const stream = message.stream;
stream.pos = 10;
stream.writeInt(stream.size);
stream.prepareWrite();
TraceUtil.traceSend(stream, this._instance, this, this._logger, this._traceLevels);
this._writeStream.swap(message.stream);
// Send the message.
if (this._writeStream.pos != this._writeStream.size) {
const completedSynchronously = this.write(this._writeStream.buffer);
if (this._writeStream.buffer.remaining === 0) {
// If the write call consumed the complete buffer, we assume the message is sent now for
// at-most-once semantics.
message.isSent = true;
}
if (!completedSynchronously) {
console.assert(!this._writeStream.isEmpty());
return response; // not done
}
}
// The message was sent synchronously, notify the message, remove it from the sent queue and keep going.
this._sendStreams.shift();
this._writeStream.swap(message.stream);
message.sent();
}
// Once the CloseConnection message is sent, we transition to the StateClosingPending state.
if (this._state === StateClosing && this._shutdownInitiated) {
this.setState(StateClosingPending);
}
} catch (ex) {
if (ex instanceof LocalException) {
this.setState(StateClosed, ex);
return response;
} else {
throw ex;
}
}
console.assert(this._writeStream.isEmpty());
return response;
}
sendMessage(message) {
console.assert(this._state >= StateActive);
console.assert(this._state < StateClosed);
if (this._sendStreams.length > 0) {
this._sendStreams.push(message);
return AsyncStatus.Queued;
}
const stream = message.stream;
stream.pos = 10;
stream.writeInt(stream.size);
stream.prepareWrite();
TraceUtil.traceSend(stream, this._instance, this, this._logger, this._traceLevels);
const completedSynchronously = this.write(stream.buffer);
if (stream.buffer.remaining === 0) {
// If the write call consumed the complete buffer, we assume the message is sent now for at-most-once
// semantics.
message.isSent = true;
}
if (completedSynchronously) {
// Entire buffer was written immediately.
message.sent();
return AsyncStatus.Sent;
}
this._writeStream.swap(message.stream);
this._sendStreams.push(message);
return AsyncStatus.Queued;
}
parseMessage() {
console.assert(this._state > StateNotValidated && this._state < StateClosed);
let info = new IncomingMessage(this._instance);
this._readStream.swap(info.stream);
this._readStream.resize(Protocol.headerSize);
this._readStream.pos = 0;
this._readHeader = true;
console.assert(info.stream.pos === info.stream.size);
try {
// We don't need to check magic and version here. This has already been done by the caller.
info.stream.pos = 8;
const messageType = info.stream.readByte();
const compress = info.stream.readByte();
if (compress === 2) {
throw new FeatureNotSupportedException("Cannot decompress compressed message");
}
info.stream.pos = Protocol.headerSize;
switch (messageType) {
case Protocol.closeConnectionMsg: {
TraceUtil.traceRecv(info.stream, this, this._logger, this._traceLevels);
// We transition directly to StateClosed, not StateClosingPending.
this.setState(StateClosed, new CloseConnectionException());
break;
}
case Protocol.requestMsg: {
if (this._state >= StateClosing) {
TraceUtil.trace(
"received request during closing\n(ignored by server, client will retry)",
info.stream,
this,
this._logger,
this._traceLevels,
);
} else {
TraceUtil.traceRecv(info.stream, this, this._logger, this._traceLevels);
info.requestId = info.stream.readInt();
info.requestCount = 1;
info.adapter = this._adapter;
++this._upcallCount;
this.cancelInactivityTimer();
++this._dispatchCount;
}
break;
}
case Protocol.requestBatchMsg: {
if (this._state >= StateClosing) {
TraceUtil.trace(
"received batch request during closing\n(ignored by server, client will retry)",
info.stream,
this,
this._logger,
this._traceLevels,
);
} else {
TraceUtil.traceRecv(info.stream, this, this._logger, this._traceLevels);
const requestCount = info.stream.readInt();
if (info.requestCount < 0) {
throw new MarshalException(`Received batch request with ${requestCount} batches.`);
}
info.requestCount = requestCount;
info.adapter = this._adapter;
this._upcallCount += info.requestCount;
this.cancelInactivityTimer();
++this._dispatchCount;
}
break;
}
case Protocol.replyMsg: {
TraceUtil.traceRecv(info.stream, this, this._logger, this._traceLevels);
info.requestId = info.stream.readInt();
info.outAsync = this._asyncRequests.get(info.requestId);
if (info.outAsync !== undefined) {
this._asyncRequests.delete(info.requestId);
// If we receive a response for a request that hasn’t been marked as sent, we store the response
// in the request's response field and delay processing until the request is marked as sent.
// This can occur if the request is sent asynchronously and the response is processed before the
// write-ready callback has a chance to run and invoke sendNextMessage.
const message = this._sendStreams.length > 0 ? this._sendStreams[0] : null;
if (message !== null && message.outAsync === info.outAsync) {
message.response = info;
info = null;
} else {
++this._upcallCount;
console.assert(info.outAsync.isSent());
}
if (
this._closed !== undefined &&
this._state < StateClosing &&
this._asyncRequests.size === 0
) {
this.doApplicationClose();
}
} else {
info = null;
}
break;
}
case Protocol.validateConnectionMsg: {
TraceUtil.traceRecv(info.stream, this, this._logger, this._traceLevels);
break;
}
default: {
TraceUtil.trace(
"received unknown message\n(invalid, closing connection)",
info.stream,
this,
this._logger,
this._traceLevels,
);
throw new ProtocolException(`Received Ice protocol message with unknown type: ${messageType}`);
}
}
} catch (ex) {
if (ex instanceof LocalException) {
this.setState(StateClosed, ex);
} else {
throw ex;
}
}
return info;
}
dispatchAll(stream, requestCount, requestId, adapter) {
const dispatcher = adapter !== null ? adapter.dispatchPipeline : null;
try {
while (requestCount > 0) {
// adapter can be null here, however the adapter set in current can't be null, and we never pass
// a null current.adapter to the application code.
const request = new IncomingRequest(requestId, this, adapter, stream);
if (dispatcher !== null) {
// We don't and can't await the dispatchAsync: with batch requests, we want all the dispatches to
// execute synchronously. If we awaited the dispatchAsync, we could switch to another event loop task.
dispatchAsync(this, request);
} else {
// Received request on a connection without an object adapter.
this.sendResponse(
request.current.createOutgoingResponseWithException(new ObjectNotExistException()),
requestId != 0,
);
}
--requestCount;
}
stream.clear();
} catch (ex) {
if (ex instanceof LocalException) {
this.dispatchException(ex, requestCount);
} else {
// An Error was raised outside of servant code (i.e., by Ice code), log the error and clean up.
this._logger.error(`unexpected exception:\n ${ex}\n${ex.stack}`);
this.dispatchException(
new UnknownException("unexpected exception dispatching request", { cause: ex }),
requestCount,
);
}
}
async function dispatchAsync(connection, request) {
try {
let response;
try {
response = await dispatcher.dispatch(request);
} catch (ex) {
response = request.current.createOutgoingResponseWithException(ex);
}
connection.sendResponse(response, requestId != 0);
} catch (ex) {
connection.dispatchException(ex, 1);
}
}
}
connectTimedOut() {
if (this._state < StateActive) {
this.setState(StateClosed, new ConnectTimeoutException());
}
// else ignore since we're already connected
}
closeTimedOut() {
if (this._state < StateClosed) {
// We don't use setState(state, exception) because we want to overwrite the exception set by a
// graceful closure.
this._exception = new CloseTimeoutException();
this.setState(StateClosed);
}
// else ignore since we're already closed.
}
warning(msg, ex) {
this._logger.warning(msg + ":\n" + this._desc + "\n" + ex.toString());
}
checkState() {
// We aren't finished until the state is finished and all outstanding requests are completed. Otherwise we
// couldn't guarantee that there are no outstanding calls when deactivate() is called on the servant locators.
if (this._state === StateFinished && this._upcallCount === 0) {
for (const p of this._finishedPromises) {
p.resolve();
}
this._finishedPromises = [];
}
}
read(buf) {
const start = buf.position;
const ret = this._transceiver.read(buf, this._hasMoreData);
if (this._traceLevels.network >= 3 && buf.position != start) {
this._logger.trace(
this._traceLevels.networkCat,
`received ${buf.position - start} of ${buf.limit - start} bytes via ${this._endpoint.protocol()}\n${this}`,
);
}
return ret;
}
write(buffer) {
const start = buffer.position;
const ret = this._transceiver.write(buffer);
if (this._traceLevels.network >= 3 && buffer.position != start) {
this._logger.trace(
this._traceLevels.networkCat,
`sent ${buffer.position - start} of ${buffer.limit - start} bytes via ${this._endpoint.protocol()}\n${this}`,
);
}
return ret;
}
scheduleInactivityTimer() {
console.assert(this._inactivityTimer === undefined);
console.assert(this._inactivityTimeout > 0);
this._inactivityTimer = new Timer();
const inactivityTimer = this._inactivityTimer;
this._inactivityTimer.schedule(() => this.inactivityCheck(inactivityTimer), this._inactivityTimeout);
}
cancelInactivityTimer() {
if (this._inactivityTimer !== undefined) {
this._inactivityTimer.destroy();
this._inactivityTimer = undefined;
}
}
}
/**
* Represents an incoming protocol message received by the connection.
*/
class IncomingMessage {
constructor(instance) {
this.stream = new InputStream(instance, Protocol.currentProtocolEncoding);
this.requestCount = 0;
this.requestId = 0;
this.adapter = null;
this.outAsync = null;
this.upcallCount = 0;
}
}
/**
* Represents an outgoing protocol message sent by the connection.
*/
class OutgoingMessage {
// Not used directly, see createForStream and create static methods below.
constructor(requestId, stream, outAsync) {
// The OutputStream containing the message to be sent. The connection swaps this stream with its own write stream
// while the message is being sent and swaps it back once the message has been sent.
this.stream = stream;
// The OutgoingAsync object associated with an outgoing request; it is always null for other message types.
this.outAsync = outAsync;
// The request ID for two-way requests; 0 for one-way requests and other message types.
this.requestId = requestId;
// For a request message: if the response is received before the request is marked as sent and removed from the
// send queue, we store the response in this field and delay its processing until the message is marked as sent.
this.response = null;
// Set to true by the transport bufferFullyWriteCallback to ensure "at most once" semantics for non-idempotent,
// retriable requests.
this.isSent = false;
}
canceled() {
console.assert(this.outAsync !== null);
this.outAsync = null;
}
// If the outgoing message represents an outgoing request, notify it that the request has been sent.
sent() {
if (this.outAsync !== null) {
this.outAsync.sent();
}
}
// If the outgoing message represents an outgoing request, notify it that the request has been completed.
completed(ex) {
if (this.outAsync !== null) {
this.outAsync.completedEx(ex);
}
}
// Creates an OutgoingMessage from a stream containing the encoded protocol message. This method is never used for
// outgoing requests.
static createForStream(stream) {
return new OutgoingMessage(0, stream, null);
}
// Creates an OutgoingMessage for an outgoing request.
static create(out, stream, requestId) {
return new OutgoingMessage(requestId, stream, out);
}
}
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