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const {
ArrayPrototypeJoin,
FunctionPrototype,
ObjectAssign,
ReflectApply,
SafeMap,
SafeSet,
} = primordials;
const assert = require('internal/assert');
const path = require('path');
const EventEmitter = require('events');
const { owner_symbol } = require('internal/async_hooks').symbols;
const Worker = require('internal/cluster/worker');
const { internal, sendHelper } = require('internal/cluster/utils');
const { exitCodes: { kNoFailure } } = internalBinding('errors');
const cluster = new EventEmitter();
const handles = new SafeMap();
const indexes = new SafeMap();
const noop = FunctionPrototype;
module.exports = cluster;
cluster.isWorker = true;
cluster.isMaster = false; // Deprecated alias. Must be same as isPrimary.
cluster.isPrimary = false;
cluster.worker = null;
cluster.Worker = Worker;
cluster._setupWorker = function() {
const worker = new Worker({
id: +process.env.NODE_UNIQUE_ID | 0,
process: process,
state: 'online'
});
cluster.worker = worker;
process.once('disconnect', () => {
worker.emit('disconnect');
if (!worker.exitedAfterDisconnect) {
// Unexpected disconnect, primary exited, or some such nastiness, so
// worker exits immediately.
process.exit(kNoFailure);
}
});
process.on('internalMessage', internal(worker, onmessage));
send({ act: 'online' });
function onmessage(message, handle) {
if (message.act === 'newconn')
onconnection(message, handle);
else if (message.act === 'disconnect')
ReflectApply(_disconnect, worker, [true]);
}
};
// `obj` is a net#Server or a dgram#Socket object.
cluster._getServer = function(obj, options, cb) {
let address = options.address;
// Resolve unix socket paths to absolute paths
if (options.port < 0 && typeof address === 'string' &&
process.platform !== 'win32')
address = path.resolve(address);
const indexesKey = ArrayPrototypeJoin(
[
address,
options.port,
options.addressType,
options.fd,
], ':');
let indexSet = indexes.get(indexesKey);
if (indexSet === undefined) {
indexSet = { nextIndex: 0, set: new SafeSet() };
indexes.set(indexesKey, indexSet);
}
const index = indexSet.nextIndex++;
indexSet.set.add(index);
const message = {
act: 'queryServer',
index,
data: null,
...options
};
message.address = address;
// Set custom data on handle (i.e. tls tickets key)
if (obj._getServerData)
message.data = obj._getServerData();
send(message, (reply, handle) => {
if (typeof obj._setServerData === 'function')
obj._setServerData(reply.data);
if (handle) {
// Shared listen socket
shared(reply, { handle, indexesKey, index }, cb);
} else {
// Round-robin.
rr(reply, { indexesKey, index }, cb);
}
});
obj.once('listening', () => {
// short-lived sockets might have been closed
if (!indexes.has(indexesKey)) {
return;
}
cluster.worker.state = 'listening';
const address = obj.address();
message.act = 'listening';
message.port = (address && address.port) || options.port;
send(message);
});
};
function removeIndexesKey(indexesKey, index) {
const indexSet = indexes.get(indexesKey);
if (!indexSet) {
return;
}
indexSet.set.delete(index);
if (indexSet.set.size === 0) {
indexes.delete(indexesKey);
}
}
// Shared listen socket.
function shared(message, { handle, indexesKey, index }, cb) {
const key = message.key;
// Monkey-patch the close() method so we can keep track of when it's
// closed. Avoids resource leaks when the handle is short-lived.
const close = handle.close;
handle.close = function() {
send({ act: 'close', key });
handles.delete(key);
removeIndexesKey(indexesKey, index);
return ReflectApply(close, handle, arguments);
};
assert(handles.has(key) === false);
handles.set(key, handle);
cb(message.errno, handle);
}
// Round-robin. Master distributes handles across workers.
function rr(message, { indexesKey, index }, cb) {
if (message.errno)
return cb(message.errno, null);
let key = message.key;
function listen(backlog) {
// TODO(bnoordhuis) Send a message to the primary that tells it to
// update the backlog size. The actual backlog should probably be
// the largest requested size by any worker.
return 0;
}
function close() {
// lib/net.js treats server._handle.close() as effectively synchronous.
// That means there is a time window between the call to close() and
// the ack by the primary process in which we can still receive handles.
// onconnection() below handles that by sending those handles back to
// the primary.
if (key === undefined)
return;
send({ act: 'close', key });
handles.delete(key);
removeIndexesKey(indexesKey, index);
key = undefined;
}
function getsockname(out) {
if (key)
ObjectAssign(out, message.sockname);
return 0;
}
// Faux handle. Mimics a TCPWrap with just enough fidelity to get away
// with it. Fools net.Server into thinking that it's backed by a real
// handle. Use a noop function for ref() and unref() because the control
// channel is going to keep the worker alive anyway.
const handle = { close, listen, ref: noop, unref: noop };
if (message.sockname) {
handle.getsockname = getsockname; // TCP handles only.
}
assert(handles.has(key) === false);
handles.set(key, handle);
cb(0, handle);
}
// Round-robin connection.
function onconnection(message, handle) {
const key = message.key;
const server = handles.get(key);
let accepted = server !== undefined;
if (accepted && server[owner_symbol]) {
const self = server[owner_symbol];
if (self.maxConnections && self._connections >= self.maxConnections) {
accepted = false;
}
}
send({ ack: message.seq, accepted });
if (accepted)
server.onconnection(0, handle);
else
handle.close();
}
function send(message, cb) {
return sendHelper(process, message, null, cb);
}
function _disconnect(primaryInitiated) {
this.exitedAfterDisconnect = true;
let waitingCount = 1;
function checkWaitingCount() {
waitingCount--;
if (waitingCount === 0) {
// If disconnect is worker initiated, wait for ack to be sure
// exitedAfterDisconnect is properly set in the primary, otherwise, if
// it's primary initiated there's no need to send the
// exitedAfterDisconnect message
if (primaryInitiated) {
process.disconnect();
} else {
send({ act: 'exitedAfterDisconnect' }, () => process.disconnect());
}
}
}
handles.forEach((handle) => {
waitingCount++;
if (handle[owner_symbol])
handle[owner_symbol].close(checkWaitingCount);
else
handle.close(checkWaitingCount);
});
handles.clear();
checkWaitingCount();
}
// Extend generic Worker with methods specific to worker processes.
Worker.prototype.disconnect = function() {
if (this.state !== 'disconnecting' && this.state !== 'destroying') {
this.state = 'disconnecting';
ReflectApply(_disconnect, this, []);
}
return this;
};
Worker.prototype.destroy = function() {
if (this.state === 'destroying')
return;
this.exitedAfterDisconnect = true;
if (!this.isConnected()) {
process.exit(kNoFailure);
} else {
this.state = 'destroying';
send({ act: 'exitedAfterDisconnect' }, () => process.disconnect());
process.once('disconnect', () => process.exit(kNoFailure));
}
};
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