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var EventEmitter = require('events').EventEmitter,
BPMux = require('bpmux').BPMux,
util = require('util'),
TYPE_SUBSCRIBE = 0,
TYPE_UNSUBSCRIBE = 1,
TYPE_UNSUBSCRIBE_ALL = 2,
TYPE_PUBLISH = 3,
thirty_two_bits = Math.pow(2, 32);
/**
Create a new `MQlobberServer` object for publishing and subscribing to messages
on behalf of a client.
@constructor
@param {QlobberFSQ|QlobberPG} fsq File system queue - an instance of [`QlobberFSQ`](https://github.com/davedoesdev/qlobber-fsq#qlobberfsqoptions). This does the heavy-lifting of reading and writing messages to a directory on the file system. Alternatively, you can pass an instance of [`QlobberPG`](https://github.com/davedoesdev/qlobber-pg), which uses PostgreSQL to process messages.
@param {Duplex} stream Connection to the client. The client should use [`MQlobberClient`](#mqlobberclientstream-options) on its side of the connection. How the connection is made is up to the caller - it just has to supply a [`Duplex`](https://nodejs.org/dist/latest-v4.x/docs/api/stream.html#stream_class_stream_duplex). For example, [`net.Socket`](https://nodejs.org/dist/latest-v4.x/docs/api/net.html#net_class_net_socket) or [`PrimusDuplex`](https://github.com/davedoesdev/primus-backpressure#primusduplexmsg_stream-options).
@param {Object} [options] Configuration options. This is passed down to [`BPMux`](https://github.com/davedoesdev/bpmux#bpmuxcarrier-options) (which multiplexes message streams over the connection to the client). It also supports the following additional properties:
- `{Boolean} send_expires` Whether to include message expiry time in metadata sent to the client. Defaults to `false`.
- `{Boolean} send_size` Whether to include message size in metadata sent to then client. Defaults to `false`.
- `{Boolean} defer_to_final_handler` If `true` then a message stream is only considered finished when all `MQlobberServer` objects finish processing it. Defaults to `false`.
*/
function MQlobberServer(fsq, stream, options)
{
EventEmitter.call(this);
options = options || {};
this.fsq = fsq;
this.subs = new Set();
this._done = false;
this.mux = new BPMux(stream, util._extend(util._extend({}, options),
{
high_channels: true
}));
var ths = this;
function error(err)
{
/*jshint validthis: true */
ths.emit('error', err, this);
}
function warning(err)
{
/*jshint validthis: true */
if (err && !ths.emit('warning', err, this))
{
console.error(err);
}
}
this._warning = warning;
this.mux.on('error', error);
function handshake_sent(duplex, complete)
{
if (!complete)
{
ths.emit('backoff');
}
}
this.mux.on('handshake_sent', handshake_sent);
this.mux.on('pre_handshake_sent', handshake_sent);
this.mux.on('drain', function ()
{
ths.emit('drain');
});
this.mux.on('full', function ()
{
ths.emit('full');
});
this.mux.on('removed', function (duplex)
{
ths.emit('removed', duplex);
});
this.mux.on('finish', function ()
{
ths._done = true;
if (!ths.emit('unsubscribe_all_requested', warning))
{
ths.default_unsubscribe_all_requested_handler();
}
});
this.relay_error = function (err)
{
/*jshint validthis: true */
/* istanbul ignore else */
if (this._readableState.pipes)
{
// In Node 12, a single pipe isn't in an array
[].concat(this._readableState.pipes).forEach(function (dest)
{
dest.emit('error', err);
});
}
};
this.handler = function (data, info, cb3)
{
var called = false;
function cb(err, cb2)
{
warning(err);
if (!called)
{
cb3.num_handlers -= 1;
called = true;
}
if (options.defer_to_final_handler && (cb3.num_handlers > 0))
{
if (cb2)
{
return cb2(err);
}
return;
}
cb3(err, cb2);
}
data.on('error', warning);
data.on('error', ths.relay_error);
if (!info.single)
{
data.on('end', cb);
}
var hdata = [Buffer.alloc(1)], buf;
hdata[0].writeUInt8((info.single ? 1 : 0) |
((options.send_expires ? 1 : 0) << 1) |
((info.existing ? 1 : 0) << 2) |
((options.send_size ? 1 : 0) << 3),
0);
if (options.send_expires)
{
buf = Buffer.alloc(8);
var expires = Math.floor(info.expires / 1000);
// 32 bits are only enough for dates up to 2106
// can't use >> and & because JS converts to 32 bits for bitwise ops
buf.writeUInt32BE(Math.floor(expires / thirty_two_bits), 0);
buf.writeUInt32BE(expires % thirty_two_bits, 4);
hdata.push(buf);
}
if (options.send_size)
{
buf = Buffer.alloc(8);
buf.writeUInt32BE(Math.floor(info.size / thirty_two_bits), 0);
buf.writeUInt32BE(info.size % thirty_two_bits, 4);
hdata.push(buf);
}
hdata.push(Buffer.from(info.topic, 'utf8'));
function multiplex(on_error)
{
var duplex = ths.mux.multiplex(Object.assign({}, options,
{
handshake_data: Buffer.concat(hdata)
}));
duplex.on('error', function ()
{
this.peer_error_then_end();
});
duplex.on('error', on_error || cb);
duplex.on('readable', function ()
{
while (true)
{
if (this.read() === null)
{
break;
}
warning.call(this, new Error('unexpected data'));
}
});
if (info.single)
{
var end = function()
{
cb(new Error('ended before handshaken'));
};
duplex.on('end', end);
duplex.on('handshake', function (hdata)
{
this.removeListener('end', end);
if (hdata.length < 1)
{
return cb(new Error('buffer too small'));
}
if (hdata.readUInt8(0, true) !== 0)
{
return cb(new Error('client error'));
}
duplex.emit('ack', info);
ths.emit('ack', info);
cb();
});
}
return duplex;
}
multiplex.num_handlers = cb3.num_handlers;
if (!ths.emit('message', data, info, multiplex, cb))
{
ths.default_message_handler(data, info, multiplex, cb);
}
};
this.handler.accept_stream = true;
this.handler.mqlobber_server = this;
function end()
{
/*jshint validthis: true */
error.call(this, new Error('ended before handshaken'));
}
this.mux.on('end', end);
this.mux.on('peer_multiplex', function (duplex)
{
duplex.on('error', warning);
});
this.mux.once('handshake', function (duplex, hdata, delay)
{
this.removeListener('end', end);
duplex.end(); // currently no data on initial duplex
this.on('handshake', function (duplex, hdata, delay)
{
if (!delay)
{
// duplex was initiated by us (outgoing message)
return;
}
function dend()
{
/*jshint validthis: true */
this.end();
}
// only read from incoming duplex but don't end until all data is
// read in order to allow application to apply back-pressure
duplex.on('end', dend);
duplex.on('error', dend);
duplex.on('error', ths.relay_error);
var handshake = delay();
function done(err)
{
warning.call(duplex, err);
var hdata = Buffer.alloc(1);
hdata.writeUInt8(err ? 1 : 0);
if (arguments.length > 1)
{
var data = arguments[arguments.length - 1];
if (Buffer.isBuffer(data))
{
hdata = Buffer.concat([hdata, data]);
}
}
handshake(hdata);
duplex.on('readable', function ()
{
while (true)
{
if (this.read() === null)
{
break;
}
warning.call(this, new Error('unexpected data'));
}
});
}
if (hdata.length < 1)
{
return done(new Error('buffer too small'));
}
var type = hdata.readUInt8(0, true),
topic;
switch (type)
{
case TYPE_SUBSCRIBE:
topic = hdata.toString('utf8', 1);
if (!ths.emit('pre_subscribe_requested', topic, done) &&
!ths.emit('subscribe_requested', topic, done))
{
ths.default_subscribe_requested_handler(topic, done);
}
break;
case TYPE_UNSUBSCRIBE:
topic = hdata.toString('utf8', 1);
if (!ths.emit('pre_unsubscribe_requested', topic, done) &&
!ths.emit('unsubscribe_requested', topic, done))
{
ths.default_unsubscribe_requested_handler(topic, done);
}
break;
case TYPE_UNSUBSCRIBE_ALL:
if (!ths.emit('unsubscribe_all_requested', done))
{
ths.default_unsubscribe_all_requested_handler(done);
}
break;
case TYPE_PUBLISH:
if (hdata.length < 2)
{
return done(new Error('buffer too small'));
}
var options = {},
flags = hdata.readUInt8(1, true),
pos = 2;
options.single = !!(flags & 1);
if (flags & 2)
{
pos += 4;
if (hdata.length < pos)
{
return done(new Error('buffer too small'));
}
options.ttl = Math.min(
options.single ? fsq._single_ttl : fsq._multi_ttl,
hdata.readUInt32BE(2, true) * 1000);
}
topic = hdata.toString('utf8', pos);
if (!ths.emit('pre_publish_requested', topic, duplex, options, done) &&
!ths.emit('publish_requested', topic, duplex, options, done))
{
ths.default_publish_requested_handler(topic, duplex, options, done);
}
break;
default:
done(new Error('unknown type: ' + type));
break;
}
});
ths.emit('handshake', hdata, delay);
});
}
util.inherits(MQlobberServer, EventEmitter);
/**
Subscribe the connected client to messages.
Note: If the client is already subscribed to `topic`, this function will do
nothing (other than call `cb`).
@param {String} topic Which messages the client should receive. Message topics are split into words using `.` as the separator. You can use `*` to match exactly one word in a topic or `#` to match zero or more words. For example, `foo.*` would match `foo.bar` whereas `foo.#` would match `foo`, `foo.bar` and `foo.bar.wup`. Note these are the default separator and wildcard characters. They can be changed when [constructing the `QlobberFSQ` instance] (https://github.com/davedoesdev/qlobber-fsq#qlobberfsqoptions) passed to `MQlobberServer`'s [constructor](#mqlobberserverfsq-stream-options).
@param {Object} [options] Optional settings for this subscription:
- `{Boolean} subscribe_to_existing` If `true` then the client will be sent any existing, unexpired messages that match `topic`, as well as new ones. Defaults to `false` (only new messages).
@param {Function} [cb] Optional function to call once the subscription has been made. This will be passed the following arguments:
- `{Object} err` If an error occurred then details of the error, otherwise `null`.
- `{Integer} n` The number of subscriptions made (0 if `topic` was already subscribed to, 1 if not).
*/
MQlobberServer.prototype.subscribe = function (topic, options, cb)
{
if (typeof options === 'function')
{
cb = options;
options = undefined;
}
var ths = this;
function cb2(err, n)
{
if (cb)
{
cb(err, n);
}
else
{
ths._warning(err);
}
}
if (!this._done && !this.subs.has(topic))
{
// assumes fsq.subscribe calls back synchronously
this.fsq.subscribe(topic, this.handler, options, function (err)
{
if (err)
{
return cb2(err, 0);
}
ths.subs.add(topic);
cb2(null, 1);
});
}
else
{
cb2(null, 0);
}
};
/**
Unsubscribe the connected client from messages.
@param {String} [topic] Which messages the client should no longer receive. If topic is `undefined` then the client will receive no more messages at all.
@param {Function} [cb] Optional function to call once the subscription has been removed. This will be passed the following arguments:
- `{Object} err` If an error occurred then details of the error, otherwise `null`'.
- `{Integer} n` The number of subscriptions removed.
*/
MQlobberServer.prototype.unsubscribe = function (topic, cb)
{
if (typeof topic === 'function')
{
cb = topic;
topic = undefined;
}
var ths = this;
function cb2(err, n)
{
if (cb)
{
cb(err, n);
}
else
{
ths._warning(err);
}
}
if (topic === undefined)
{
var count = 0,
unsub = function (t)
{
// assumes fsq.unsubscribe calls back synchronously
ths.fsq.unsubscribe(t, ths.handler, function (err)
{
if (err)
{
return cb2(err, count);
}
ths.subs.delete(t);
count += 1;
process.nextTick(next);
});
},
next = function ()
{
for (var t of ths.subs)
{
return unsub(t);
}
cb2(null, count);
};
next();
}
else if (this.subs.has(topic))
{
// assumes fsq.unsubscribe calls back synchronously
this.fsq.unsubscribe(topic, this.handler, function (err)
{
if (err)
{
return cb2(err, 0);
}
ths.subs.delete(topic);
cb2(null, 1);
});
}
else
{
cb2(null, 0);
}
};
MQlobberServer.prototype.default_message_handler = function (data, info, multiplex, cb)
{
try
{
data.pipe(multiplex());
}
catch (ex)
{
cb(ex);
}
};
MQlobberServer.prototype.default_subscribe_requested_handler = function (topic, done)
{
this.subscribe(topic, done);
};
MQlobberServer.prototype.default_unsubscribe_requested_handler = function (topic, done)
{
this.unsubscribe(topic, done);
};
MQlobberServer.prototype.default_unsubscribe_all_requested_handler = function (done)
{
this.unsubscribe(done);
};
MQlobberServer.prototype.default_publish_requested_handler = function (topic, duplex, options, done)
{
duplex.pipe(this.fsq.publish(topic, options, done));
};
exports.MQlobberServer = MQlobberServer;
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