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const { ERR_CHILD_CLOSED_BEFORE_REPLY } = require('internal/errors').codes;
const EventEmitter = require('events');
// This object keeps track of the sockets that are sent
class SocketListSend extends EventEmitter {
constructor(child, key) {
super();
this.key = key;
this.child = child;
child.once('exit', () => this.emit('exit', this));
}
_request(msg, cmd, swallowErrors, callback) {
const self = this;
if (!this.child.connected) return onclose();
this.child._send(msg, undefined, swallowErrors);
function onclose() {
self.child.removeListener('internalMessage', onreply);
callback(new ERR_CHILD_CLOSED_BEFORE_REPLY());
}
function onreply(msg) {
if (!(msg.cmd === cmd && msg.key === self.key)) return;
self.child.removeListener('disconnect', onclose);
self.child.removeListener('internalMessage', onreply);
callback(null, msg);
}
this.child.once('disconnect', onclose);
this.child.on('internalMessage', onreply);
}
close(callback) {
this._request({
cmd: 'NODE_SOCKET_NOTIFY_CLOSE',
key: this.key
}, 'NODE_SOCKET_ALL_CLOSED', true, callback);
}
getConnections(callback) {
this._request({
cmd: 'NODE_SOCKET_GET_COUNT',
key: this.key
}, 'NODE_SOCKET_COUNT', false, (err, msg) => {
if (err) return callback(err);
callback(null, msg.count);
});
}
}
// This object keeps track of the sockets that are received
class SocketListReceive extends EventEmitter {
constructor(child, key) {
super();
this.connections = 0;
this.key = key;
this.child = child;
function onempty(self) {
if (!self.child.connected) return;
self.child._send({
cmd: 'NODE_SOCKET_ALL_CLOSED',
key: self.key
}, undefined, true);
}
this.child.on('internalMessage', (msg) => {
if (msg.key !== this.key) return;
if (msg.cmd === 'NODE_SOCKET_NOTIFY_CLOSE') {
// Already empty
if (this.connections === 0) return onempty(this);
// Wait for sockets to get closed
this.once('empty', onempty);
} else if (msg.cmd === 'NODE_SOCKET_GET_COUNT') {
if (!this.child.connected) return;
this.child._send({
cmd: 'NODE_SOCKET_COUNT',
key: this.key,
count: this.connections
});
}
});
}
add(obj) {
this.connections++;
// Notify the previous owner of the socket about its state change
obj.socket.once('close', () => {
this.connections--;
if (this.connections === 0) this.emit('empty', this);
});
}
}
module.exports = { SocketListSend, SocketListReceive };
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