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import { ConnectionI } from "./ConnectionI.js";
import { HashMap } from "./HashMap.js";
import { Promise } from "./Promise.js";
import { LocalException } from "./LocalException.js";
import { CommunicatorDestroyedException } from "./LocalExceptions.js";
import { ConnectTimeoutException } from "./LocalExceptions.js";
//
// Only for use by Instance.
//
export class OutgoingConnectionFactory {
constructor(communicator, instance) {
this._communicator = communicator;
this._instance = instance;
this._destroyed = false;
this._defaultObjectAdapter = null;
this._connectionOptions = instance.clientConnectionOptions;
this._connectionsByEndpoint = new ConnectionListMap(); // map<EndpointI, Array<Ice.ConnectionI>>
this._pending = new HashMap(HashMap.compareEquals); // map<EndpointI, Array<ConnectCallback>>
this._pendingConnectCount = 0;
this._waitPromise = null;
}
destroy() {
if (this._destroyed) {
return;
}
this._connectionsByEndpoint.forEach(connection => connection.destroy());
this._destroyed = true;
this._communicator = null;
this._defaultObjectAdapter = null;
this.checkFinished();
}
waitUntilFinished() {
this._waitPromise = new Promise();
this.checkFinished();
return this._waitPromise;
}
//
// Returns a promise, success callback receives the connection
//
create(endpoints, hasMore) {
console.assert(endpoints.length > 0);
//
// Try to find a connection to one of the given endpoints.
//
try {
const connection = this.findConnectionByEndpoint(endpoints);
if (connection !== null) {
return Promise.resolve(connection);
}
} catch (ex) {
return Promise.reject(ex);
}
return new ConnectCallback(this, endpoints, hasMore).start();
}
setRouterInfo(routerInfo) {
return Promise.resolve()
.then(() => {
if (this._destroyed) {
throw new CommunicatorDestroyedException();
}
return routerInfo.getClientEndpoints();
})
.then(endpoints => {
//
// Search for connections to the router's client proxy
// endpoints, and update the object adapter for such
// connections, so that callbacks from the router can be
// received over such connections.
//
const adapter = routerInfo.getAdapter();
endpoints.forEach(endpoint => {
//
// The Connection object does not take the compression flag of
// endpoints into account, but instead gets the information
// about whether messages should be compressed or not from
// other sources. In order to allow connection sharing for
// endpoints that differ in the value of the compression flag
// only, we always set the compression flag to false here in
// this connection factory. We also clear the timeout as it is
// no longer used for Ice 3.8.
//
endpoint = endpoint.changeCompress(false).changeTimeout(-1);
this._connectionsByEndpoint.forEach(connection => {
if (connection.endpoint().equals(endpoint)) {
connection.setAdapter(adapter);
}
});
});
});
}
removeAdapter(adapter) {
if (this._destroyed) {
return;
}
this._connectionsByEndpoint.forEach(connection => {
if (connection.getAdapter() === adapter) {
connection.setAdapter(null);
}
});
}
async flushAsyncBatchRequests() {
if (!this._destroyed) {
await Promise.all(
this._connectionsByEndpoint.map(connection => {
if (connection.isActiveOrHolding()) {
return connection.flushBatchRequests().catch(ex => {
if (ex instanceof LocalException) {
// Ignore
} else {
throw ex;
}
});
}
}),
);
}
}
getDefaultObjectAdapter() {
return this._defaultObjectAdapter;
}
setDefaultObjectAdapter(adapter) {
this._defaultObjectAdapter = adapter;
}
findConnectionByEndpoint(endpoints) {
if (this._destroyed) {
throw new CommunicatorDestroyedException();
}
console.assert(endpoints.length > 0);
for (const endpoint of endpoints) {
const proxyEndpoint = endpoint.changeTimeout(-1);
if (this._pending.has(proxyEndpoint)) {
continue;
}
const connectionList = this._connectionsByEndpoint.get(proxyEndpoint);
if (connectionList === undefined) {
continue;
}
for (let j = 0; j < connectionList.length; ++j) {
if (connectionList[j].isActiveOrHolding()) {
// Don't return destroyed or un-validated connections
return connectionList[j];
}
}
}
return null;
}
incPendingConnectCount() {
//
// Keep track of the number of pending connects. The outgoing connection factory
// waitUntilFinished() method waits for all the pending connects to terminate before
// to return. This ensures that the communicator client thread pool isn't destroyed
// too soon and will still be available to execute the ice_exception() callbacks for
// the asynchronous requests waiting on a connection to be established.
//
if (this._destroyed) {
throw new CommunicatorDestroyedException();
}
++this._pendingConnectCount;
}
decPendingConnectCount() {
--this._pendingConnectCount;
console.assert(this._pendingConnectCount >= 0);
if (this._destroyed && this._pendingConnectCount === 0) {
this.checkFinished();
}
}
getConnection(endpoints, cb) {
if (this._destroyed) {
throw new CommunicatorDestroyedException();
}
// Search for an existing connections matching one of the given endpoints.
const connection = this.findConnectionByEndpoint(endpoints);
if (connection !== null) {
return connection;
}
if (!this.addToPending(cb, endpoints)) {
// No connection is currently pending to one of our endpoints, call nextEndpoint to start the connection
// establishment.
cb.nextEndpoint();
}
// Return null to indicate to the caller that the connection is being established.
return null;
}
createConnection(transceiver, endpoint) {
console.assert(this._pending.has(endpoint) && transceiver !== null);
//
// Create and add the connection to the connection map. Adding the connection to the map
// is necessary to support the interruption of the connection initialization and validation
// in case the communicator is destroyed.
//
let connection = null;
try {
if (this._destroyed) {
throw new CommunicatorDestroyedException();
}
connection = new ConnectionI(
this._communicator,
this._instance,
transceiver,
endpoint.changeCompress(false).changeTimeout(-1),
this._defaultObjectAdapter,
connection => this.removeConnection(connection),
this._connectionOptions,
);
} catch (ex) {
console.assert(ex instanceof LocalException);
transceiver.close();
throw ex;
}
this._connectionsByEndpoint.set(connection.endpoint(), connection);
this._connectionsByEndpoint.set(connection.endpoint().changeCompress(true), connection);
return connection;
}
removeConnection(connection) {
this._connectionsByEndpoint.removeConnection(connection.endpoint(), connection);
this._connectionsByEndpoint.removeConnection(connection.endpoint().changeCompress(true), connection);
}
finishGetConnection(endpoints, endpoint, connection, cb) {
// cb is-a ConnectCallback
const connectionCallbacks = [];
if (cb !== null) {
connectionCallbacks.push(cb);
}
const callbacks = [];
endpoints.forEach(endpt => {
const cbs = this._pending.get(endpt);
if (cbs !== undefined) {
this._pending.delete(endpt);
cbs.forEach(cc => {
if (cc.hasEndpoint(endpoint)) {
if (connectionCallbacks.indexOf(cc) === -1) {
connectionCallbacks.push(cc);
}
} else if (callbacks.indexOf(cc) === -1) {
callbacks.push(cc);
}
});
}
});
connectionCallbacks.forEach(cc => {
cc.removeFromPending();
const idx = callbacks.indexOf(cc);
if (idx !== -1) {
callbacks.splice(idx, 1);
}
});
callbacks.forEach(cc => cc.removeFromPending());
callbacks.forEach(cc => cc.getConnection());
connectionCallbacks.forEach(cc => cc.setConnection(connection));
this.checkFinished();
}
finishGetConnectionEx(endpoints, ex, cb) {
// cb is-a ConnectCallback
const failedCallbacks = [];
if (cb !== null) {
failedCallbacks.push(cb);
}
const callbacks = [];
endpoints.forEach(endpt => {
const cbs = this._pending.get(endpt);
if (cbs !== undefined) {
this._pending.delete(endpt);
cbs.forEach(cc => {
if (cc.removeEndpoints(endpoints)) {
if (failedCallbacks.indexOf(cc) === -1) {
failedCallbacks.push(cc);
}
} else if (callbacks.indexOf(cc) === -1) {
callbacks.push(cc);
}
});
}
});
callbacks.forEach(cc => {
console.assert(failedCallbacks.indexOf(cc) === -1);
cc.removeFromPending();
});
this.checkFinished();
callbacks.forEach(cc => cc.getConnection());
failedCallbacks.forEach(cc => cc.setException(ex));
}
addToPending(cb, endpoints) {
console.assert(cb !== null);
// Add the callback to each pending list.
let found = false;
endpoints.forEach(p => {
const cbs = this._pending.get(p);
if (cbs !== undefined) {
found = true;
if (cbs.indexOf(cb) === -1) {
cbs.push(cb); // Add the callback to each pending endpoint.
}
}
});
if (found) {
return true;
}
// If there's no pending connection for the given endpoints, we're responsible for its establishment. We add an
// empty pending lists, other callbacks to the same endpoints will be queued.
endpoints.forEach(p => {
if (!this._pending.has(p)) {
this._pending.set(p, []);
}
});
return false;
}
removeFromPending(cb, endpoints) {
// cb is-a ConnectCallback
endpoints.forEach(p => {
const cbs = this._pending.get(p);
if (cbs !== undefined) {
const idx = cbs.indexOf(cb);
if (idx !== -1) {
cbs.splice(idx, 1);
}
}
});
}
handleConnectionException(ex, hasMore) {
const traceLevels = this._instance.traceLevels();
if (traceLevels.network >= 2) {
const s = [];
s.push("connection to endpoint failed");
if (ex instanceof CommunicatorDestroyedException) {
s.push("\n");
} else if (hasMore) {
s.push(", trying next endpoint\n");
} else {
s.push(" and no more endpoints to try\n");
}
s.push(ex.toString());
this._instance.initializationData().logger.trace(traceLevels.networkCat, s.join(""));
}
}
async checkFinished() {
//
// Can't continue until the factory is destroyed and there are no pending connections.
//
if (!this._waitPromise || !this._destroyed || this._pending.size > 0 || this._pendingConnectCount > 0) {
return;
}
await Promise.all(
this._connectionsByEndpoint.map(async connection => {
try {
await connection.waitUntilFinished();
} catch (ex) {
console.assert(false, ex);
}
}),
);
console.assert(this._waitPromise !== null);
this._waitPromise.resolve();
}
}
//
// Value is a Vector<Ice.ConnectionI>
//
class ConnectionListMap extends HashMap {
constructor(h) {
super(h || HashMap.compareEquals);
}
set(key, value) {
let list = this.get(key);
if (list === undefined) {
list = [];
super.set(key, list);
}
console.assert(value instanceof ConnectionI);
list.push(value);
return undefined;
}
removeConnection(key, conn) {
const list = this.get(key);
console.assert(list !== null);
const idx = list.indexOf(conn);
console.assert(idx !== -1);
list.splice(idx, 1);
if (list.length === 0) {
this.delete(key);
}
}
map(fn) {
const arr = [];
this.forEach(c => arr.push(fn(c)));
return arr;
}
forEach(fn) {
for (const connections of this.values()) {
connections.forEach(fn);
}
}
}
class ConnectCallback {
constructor(f, endpoints, more) {
this._factory = f;
this._endpoints = endpoints;
this._hasMore = more;
this._promise = new Promise();
this._index = 0;
this._current = null;
}
//
// Methods from ConnectionI_StartCallback
//
connectionStartCompleted(connection) {
connection.activate();
this._factory.finishGetConnection(this._endpoints, this._current, connection, this);
}
connectionStartFailed(ex) {
console.assert(this._current !== null);
if (this.connectionStartFailedImpl(ex)) {
this.nextEndpoint();
}
}
setConnection(connection) {
//
// Callback from the factory: the connection to one of the callback
// connectors has been established.
//
this._promise.resolve(connection);
this._factory.decPendingConnectCount(); // Must be called last.
}
setException(ex) {
//
// Callback from the factory: connection establishment failed.
//
this._promise.reject(ex);
this._factory.decPendingConnectCount(); // Must be called last.
}
hasEndpoint(endpoint) {
return this.findEndpoint(endpoint) !== -1;
}
findEndpoint(endpoint) {
return this._endpoints.findIndex(value => endpoint.equals(value));
}
removeEndpoints(endpoints) {
endpoints.forEach(endpoint => {
const idx = this.findEndpoint(endpoint);
if (idx !== -1) {
this._endpoints.splice(idx, 1);
}
});
this._index = 0;
return this._endpoints.length === 0;
}
removeFromPending() {
this._factory.removeFromPending(this, this._endpoints);
}
start() {
try {
//
// Notify the factory that there's an async connect pending. This is necessary
// to prevent the outgoing connection factory to be destroyed before all the
// pending asynchronous connects are finished.
//
this._factory.incPendingConnectCount();
} catch (ex) {
this._promise.reject(ex);
return;
}
this.getConnection();
return this._promise;
}
getConnection() {
try {
const connection = this._factory.getConnection(this._endpoints, this);
if (connection === null) {
// A null return value from getConnection indicates that the connection is being established, and the
// callback will be notified when the connection establishment is done.
return;
}
this._promise.resolve(connection);
this._factory.decPendingConnectCount(); // Must be called last.
} catch (ex) {
this._promise.reject(ex);
this._factory.decPendingConnectCount(); // Must be called last.
}
}
nextEndpoint() {
const start = connection => {
connection.start().then(
() => {
this.connectionStartCompleted(connection);
},
ex => {
this.connectionStartFailed(ex);
},
);
};
while (true) {
const traceLevels = this._factory._instance.traceLevels();
try {
console.assert(this._index < this._endpoints.length);
this._current = this._endpoints[this._index++];
if (traceLevels.network >= 2) {
const s = [];
s.push("trying to establish ");
s.push(this._current.protocol());
s.push(" connection to ");
s.push(this._current.toConnectorString());
this._factory._instance.initializationData().logger.trace(traceLevels.networkCat, s.join(""));
}
start(this._factory.createConnection(this._current.connect(), this._current));
} catch (ex) {
if (traceLevels.network >= 2) {
const s = [];
s.push("failed to establish ");
s.push(this._current.protocol());
s.push(" connection to ");
s.push(this._current.toString());
s.push("\n");
s.push(ex.toString());
this._factory._instance.initializationData().logger.trace(traceLevels.networkCat, s.join(""));
}
if (this.connectionStartFailedImpl(ex)) {
continue;
}
}
break;
}
}
connectionStartFailedImpl(ex) {
this._factory.handleConnectionException(ex, this._hasMore || this._index < this._endpoints.length);
// We stop on ConnectTimeoutException to fail reasonably fast when the endpoint has many connectors
// (IP addresses).
if (
this._index < this._endpoints.length &&
!(ex instanceof CommunicatorDestroyedException || ex instanceof ConnectTimeoutException)
) {
return true; // keep going
}
this._factory.finishGetConnectionEx(this._endpoints, ex, this);
return false;
}
}
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