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/**
* Centro extension for limiting the number of active subscriptions,
* publications and connections.
*
* @module centro-js/lib/server_extensions/limit_active
*/
"use strict";
/**
* Limit the total number of active subscriptions.
*
* @param {Object} config - Configuration options.
* @param {integer} config.max_subscriptions - Maximum number of active subscriptions.
*/
exports.limit_active_subscriptions = function (config)
{
var count = 0;
return {
pre_connect: function (info)
{
this.pipeline(info.mqserver, 'subscribe_requested', function (topic, cb, next)
{
if ((count >= config.max_subscriptions) &&
!this.subs.has(topic))
{
return cb(new Error('subscription limit ' + config.max_subscriptions +
' already reached: ' + topic));
}
next(topic, function (err, n)
{
count += n;
cb.apply(this, arguments);
});
});
this.pipeline(info.mqserver, 'unsubscribe_requested', function (topic, cb, next)
{
next(topic, function (err, n)
{
count -= n;
cb.apply(this, arguments);
});
});
this.pipeline(info.mqserver, 'unsubscribe_all_requested', function (cb, next)
{
next(function (err, n)
{
count -= n;
cb.apply(this, arguments);
});
});
}
};
};
/**
* Limit the total number of active publications.
*
* @param {Object} config - Configuration options.
* @param {integer} config.max_publications - Maximum number of active publications.
*/
exports.limit_active_publications = function (config)
{
var count = 0;
return {
pre_connect: function (info)
{
this.pipeline(info.mqserver, 'publish_requested', function (topic, stream, options, cb, next)
{
if (count >= config.max_publications)
{
return cb(new Error('publication limit ' + config.max_publications +
' already reached: ' + topic));
}
count += 1;
var decrement = function ()
{
count -= 1;
cb.apply(this, arguments);
};
/*jshint validthis: true */
function cb2()
{
var dec = decrement;
decrement = cb; // only decrement once
dec.apply(this, arguments);
}
next(topic, stream, options, cb2);
});
}
};
};
/**
* Limit the total number of active connections.
*
* @param {Object} config - Configuration options.
* @param {integer} config.max_connections - Maximum number of active connections.
*/
exports.limit_active_connections = function (config)
{
var count = 0;
return {
authz_start: function (cancel, onclose)
{
count += 1;
onclose(function ()
{
count -= 1;
});
if (count > config.max_connections)
{
cancel(new Error('connection limit ' + config.max_connections +
' exceeded'));
}
}
};
};
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