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const {
ArrayIsArray,
Boolean,
ObjectCreate,
SafeMap,
} = primordials;
const assert = require('internal/assert');
const net = require('net');
const { sendHelper } = require('internal/cluster/utils');
const { append, init, isEmpty, peek, remove } = require('internal/linkedlist');
const { constants } = internalBinding('tcp_wrap');
module.exports = RoundRobinHandle;
function RoundRobinHandle(key, address, { port, fd, flags, backlog }) {
this.key = key;
this.all = new SafeMap();
this.free = new SafeMap();
this.handles = init(ObjectCreate(null));
this.handle = null;
this.server = net.createServer(assert.fail);
if (fd >= 0)
this.server.listen({ fd, backlog });
else if (port >= 0) {
this.server.listen({
port,
host: address,
// Currently, net module only supports `ipv6Only` option in `flags`.
ipv6Only: Boolean(flags & constants.UV_TCP_IPV6ONLY),
backlog,
});
} else
this.server.listen(address, backlog); // UNIX socket path.
this.server.once('listening', () => {
this.handle = this.server._handle;
this.handle.onconnection = (err, handle) => this.distribute(err, handle);
this.server._handle = null;
this.server = null;
});
}
RoundRobinHandle.prototype.add = function(worker, send) {
assert(this.all.has(worker.id) === false);
this.all.set(worker.id, worker);
const done = () => {
if (this.handle.getsockname) {
const out = {};
this.handle.getsockname(out);
// TODO(bnoordhuis) Check err.
send(null, { sockname: out }, null);
} else {
send(null, null, null); // UNIX socket.
}
this.handoff(worker); // In case there are connections pending.
};
if (this.server === null)
return done();
// Still busy binding.
this.server.once('listening', done);
this.server.once('error', (err) => {
send(err.errno, null);
});
};
RoundRobinHandle.prototype.remove = function(worker) {
const existed = this.all.delete(worker.id);
if (!existed)
return false;
this.free.delete(worker.id);
if (this.all.size !== 0)
return false;
while (!isEmpty(this.handles)) {
const handle = peek(this.handles);
handle.close();
remove(handle);
}
this.handle.close();
this.handle = null;
return true;
};
RoundRobinHandle.prototype.distribute = function(err, handle) {
append(this.handles, handle);
// eslint-disable-next-line node-core/no-array-destructuring
const [ workerEntry ] = this.free; // this.free is a SafeMap
if (ArrayIsArray(workerEntry)) {
const { 0: workerId, 1: worker } = workerEntry;
this.free.delete(workerId);
this.handoff(worker);
}
};
RoundRobinHandle.prototype.handoff = function(worker) {
if (!this.all.has(worker.id)) {
return; // Worker is closing (or has closed) the server.
}
const handle = peek(this.handles);
if (handle === null) {
this.free.set(worker.id, worker); // Add to ready queue again.
return;
}
remove(handle);
const message = { act: 'newconn', key: this.key };
sendHelper(worker.process, message, handle, (reply) => {
if (reply.accepted)
handle.close();
else
this.distribute(0, handle); // Worker is shutting down. Send to another.
this.handoff(worker);
});
};
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