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/**
* Centro client functions
* @module centro-js/lib/client
*/
"use strict";
var frame = require('frame-stream'),
async = require('async'),
MQlobberClient = require('mqlobber/lib/client').MQlobberClient,
Ajv = require('ajv'),
ajv = new Ajv(),
{ get_topic_pattern } = require('./pattern');
exports.version = require('./version');
exports.version_buffer = Buffer.alloc(4),
/*jshint expr: true */
exports.version_buffer.writeUInt32BE(exports.version, 0, true);
/*jshint expr: false */
function get_stokens(config)
{
var tokens = config.token;
if (typeof tokens === 'string')
{
tokens = [tokens];
}
return tokens.join(',');
}
function start(stream, config)
{
config = Object.assign(
stream._no_keep_alive ? { keep_alive: false } : {},
config);
var bufs = [exports.version_buffer];
if (config.handshake_data)
{
bufs.push(config.handshake_data);
}
config.handshake_data = Buffer.concat(bufs);
var mqclient = new MQlobberClient(stream, config);
mqclient.on('handshake', function (hsdata)
{
try
{
hsdata = JSON.parse(hsdata);
}
catch (ex)
{
return this.emit('error', ex);
}
var num_prefixes;
if ((typeof config.token === 'string') ||
(typeof config.token === 'undefined'))
{
num_prefixes = 1;
}
else
{
num_prefixes = config.token.length;
}
const matcher = mqclient._matcher;
const pattern_config = {
separator: matcher._separator,
wildcard_some: matcher._wildcard_some,
max_words: matcher._max_words,
max_wildcard_somes: matcher._max_wildcard_somes,
max_topic_length: config.max_topic_length
};
if (!ajv.validate({
type: 'object',
required: ['self', 'prefixes', 'version'],
additionalProperties: false,
properties: {
self: {
type: 'string'
},
prefixes: {
type: 'array',
minItems: num_prefixes,
maxItems: num_prefixes,
items: {
type: 'string',
oneOf: [{
minLength: 65,
maxLength: 65
}, {
minLength: 0,
maxLength: 0
}]
}
},
subscriptions: {
type: 'array',
maxItems: num_prefixes,
items: {
type: 'object',
maxProperties: config.max_subscriptions,
additionalProperties: false,
patternProperties: {
[get_topic_pattern(pattern_config)]: {
type: 'boolean'
}
}
}
},
version: {
type: 'integer',
enum: [exports.version]
}
}
}, hsdata))
{
var msg = ajv.errorsText(ajv.errors);
if (ajv.validate({
type: 'object',
required: ['error', 'version'],
additionalProperties: false,
properties: {
error: {
type: 'string'
},
version: {
type: 'integer',
enum: [exports.version]
}
}
}, hsdata))
{
return this.emit('error', new Error(hsdata.error));
}
return this.emit('error', new Error(msg));
}
this.self = hsdata.self;
function replace(topic)
{
return topic.split('${self}').join(hsdata.self);
}
if (hsdata.subscriptions)
{
for (var i = 0; i < hsdata.subscriptions.length; i += 1)
{
var subscription = hsdata.subscriptions[i];
for (var topic in subscription)
{
/* istanbul ignore else */
if (Object.prototype.hasOwnProperty.call(subscription, topic))
{
this.subs.set(hsdata.prefixes[i] + topic, new Set());
}
}
}
}
this._orig_subscribe = this.subscribe;
this.subscribe = function (n, topic, handler, cb)
{
if (typeof n !== 'number')
{
cb = handler;
handler = topic;
topic = n;
n = 0;
}
if (n >= hsdata.prefixes.length)
{
return cb(new Error('token out of range'));
}
topic = hsdata.prefixes[n] + replace(topic);
var centro_subs = handler._centro_subs;
if (!centro_subs)
{
centro_subs = handler._centro_subs = new Map();
}
var handlers = centro_subs.get(this);
if (!handlers)
{
handlers = new Map();
centro_subs.set(this, handlers);
}
var handler2 = handlers.get(topic);
if (!handler2)
{
handler2 = function (s, info, done)
{
if (handlers.get(topic) === handler2)
{
handler.call(this, s, Object.assign({}, info,
{
topic: info.topic.substr(hsdata.prefixes[n].length).split(hsdata.self).join('${self}')
}), done);
}
};
handler2.handler = handler;
handlers.set(topic, handler2);
}
this._orig_subscribe(topic, handler2, cb);
};
this._orig_unsubscribe = this.unsubscribe;
this.unsubscribe = function (n, topic, handler, cb)
{
if (typeof n !== 'number')
{
cb = handler;
handler = topic;
topic = n;
n = 0;
}
if (typeof topic === 'function')
{
cb = topic;
topic = undefined;
handler = undefined;
}
if (n >= hsdata.prefixes.length)
{
return cb(new Error('token out of range'));
}
var ths = this;
function unsub(t, h)
{
var centro_subs = h._centro_subs;
if (!centro_subs)
{
return h;
}
var handlers = centro_subs.get(ths);
if (!handlers)
{
return h;
}
var h2 = handlers.get(t);
if (!h2)
{
return h;
}
handlers.delete(t);
if (handlers.size === 0)
{
centro_subs.delete(ths);
if (centro_subs.size === 0)
{
delete h._centro_subs;
}
}
return h2;
}
if (topic === undefined)
{
async.eachSeries(this.subs, function (th, cb)
{
if (th[0].lastIndexOf(hsdata.prefixes[n], 0) === 0)
{
for (var h of th[1])
{
unsub(th[0], h.handler);
}
// Remove while iterating on ES6 Maps is consistent
ths._orig_unsubscribe(th[0], undefined, cb);
}
else
{
cb();
}
}, cb);
}
else
{
topic = hsdata.prefixes[n] + replace(topic);
if (handler === undefined)
{
var hs = this.subs.get(topic);
if (hs !== undefined)
{
for (var h of hs)
{
unsub(topic, h.handler);
}
}
}
else
{
handler = unsub(topic, handler);
}
this._orig_unsubscribe(topic,
handler,
cb);
}
};
this._orig_publish = this.publish;
this.publish = function (n, topic, options, cb)
{
if (typeof n !== 'number')
{
cb = options;
options = topic;
topic = n;
n = 0;
}
if (typeof options === 'function')
{
cb = options;
options = undefined;
}
if (n >= hsdata.prefixes.length)
{
cb(new Error('token out of range'));
return null;
}
return this._orig_publish(hsdata.prefixes[n] + replace(topic),
options,
cb);
};
this.emit('ready', hsdata.subscriptions);
});
return mqclient;
}
exports.start = start;
/**
* Get authorization data for transports which use HTTP Basic Authentication
* (currently Primus) and then initiate communication with a server on a stream
* you supply.
*
* @param {Object} [config] - Configuration options. This supports all the options supported by {@link https://github.com/davedoesdev/mqlobber#mqlobberclientstream-options|MQlobberClient} as well as the following:
* @param {string|string[]} [config.token] - JSON Web Token(s) to present to the server.
* @param {integer} [config.max_subscriptions] - If the server returns pre-subscription data (see the {@link centro-js/lib/client.event:MQlobberClient#ready|ready} event), emit an `error` event if there are more entries than this maximum. If not specified, no limit is applied.
* @param {integer} [config.max_topic_length] - If the server returns pre-subscription data (see the {@link centro-js/lib/client.event:MQlobberClient#ready|ready} event), emit an `error` event if one of the topics exceeds this length. If not specified, no limit is applied.
* @param {centro-js/lib/client.authzCallback} cb - Called with authorization data.
*/
exports.separate_auth = function (config, cb)
{
if (!cb)
{
cb = config;
config = {};
}
var stokens;
try
{
stokens = get_stokens(config);
}
catch (ex)
{
return cb(ex);
}
cb(null, 'centro:' + stokens, function (stream)
{
return start(stream, config);
});
};
/**
* Authorize with a server on a stream, for transports which send authorization
* data as a stream header (currently all except Primus and HTTP).
*
* @param {stream.Duplex} stream - Connection you've already made to the server.
* @param {Object} [config] - Configuration options. This supports all the options supported by {@link https://github.com/davedoesdev/mqlobber#mqlobberclientstream-options|MQlobberClient} as well as the following:
* @param {string|string[]} [config.token] - JSON Web Token(s) to present to the server.
* @param {integer} [config.max_subscriptions] - If the server returns pre-subscription data (see the {@link centro-js/lib/client.event:MQlobberClient#ready|ready} event), emit an `error` event if there are more entries than this maximum. If not specified, no limit is applied.
* @param {integer} [config.max_topic_length] - If the server returns pre-subscription data (see the {@link centro-js/lib/client.event:MQlobberClient#ready|ready} event), emit an `error` event if one of the topics exceeds this length. If not specified, no limit is applied.
* @returns {MQlobberClient} - Object you can use for publishing and subscribing to messages. See the {@link https://github.com/davedoesdev/mqlobber#mqlobberclientstream-options|mqlobber documentation}.
*/
exports.stream_auth = function (stream, config)
{
// write frame
var out_stream = frame.encode(config);
out_stream._pushFrameData = function (bufs)
{
for (var buf of bufs)
{
stream.write(buf);
}
};
out_stream.end(get_stokens(config));
return start(stream, config);
};
/*eslint-disable no-unused-vars */
/**
* Callback type for HTTP Basic Authentication data.
*
* @callback authzCallback
* @memberof centro-js/lib/client
* @param {?Error} err - Error, if one occurred.
* @param {string} userpass - Authentication data in the form `centro:<tokens>` where `<tokens>` a comma-separated list of tokens you passed to {@link centro-js/lib/client.separate_auth}.
* @param {streamCallback} cb - Call this when you've made a connection to the server.
*/
/* istanbul ignore next */
exports._authzCallback = function (err, userpass, cb) {};
/**
* Callback type for connection to server.
*
* @callback streamCallback
* @memberof centro-js/lib/client
* @param {stream.Duplex} stream - Connection you've made to the server.
* @returns {MQlobberClient} - Object you can use for publishing and subscribing to messages. See the {@link https://github.com/davedoesdev/mqlobber#mqlobberclientstream-options|mqlobber documentation}.
*/
/* istanbul ignore next */
exports._streamCallback = function (stream) {};
/**
* Ready event. This is an extra event added to {@link https://github.com/davedoesdev/mqlobber#mqlobberclientstream-options|MQlobberClient} and is emitted when the server has authorized the client and a connection is established.
*
* @event MQlobberClient#ready
* @memberof centro-js/lib/client
* @param {Object.<string, boolean>[]} [subscriptions] - For each authorization token you supplied to {@link centro-js/lib/client.separate_auth} or {@link centro-js/lib/client.stream_auth}, a map containing the topics to which the client has been pre-subscribed. Each topic maps to whether the client will receive existing messages for the topic (`true`) or just new ones (`false`). If no tokens specified any pre-subscriptions then this will be `undefined`.
*/
/* istanbul ignore next */
exports._ready_event = function (subscriptions) {};
|