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const { EventEmitter } = require('events');
const { URL } = require('url');
const async = require('async');
const { AmqpQueue } = require('general-mq/lib/amqp-queue');
const { DataTypes, Status, Events } = require('general-mq/lib/constants');
const { MqttQueue } = require('general-mq/lib/mqtt-queue');
const {
Connection,
DataMqStatus,
Options,
getConnection,
removeConnection,
newDataQueues,
} = require('./lib');
const { MgrStatus, Errors } = require('./constants');
/**
* Uplink data from broker to application.
*
* @typedef {Object} AppUlData
* @property {string} dataId
* @property {Date} time
* @property {Date} pub
* @property {string} deviceId
* @property {string} networkId
* @property {string} networkCode
* @property {string} networkAddr
* @property {boolean} isPublic
* @property {Buffer} data
* @property {Object} [extension]
*/
/**
* Downlink data from application to broker.
*
* @typedef {Object} AppDlData
* @property {string} correlationId
* @property {string} [deviceId]
* @property {string} [networkCode]
* @property {string} [networkAddr]
* @property {Buffer} data
* @property {Object} [extension]
*/
/**
* Downlink data response for `AppDlData`.
*
* @typedef {Object} AppDlDataResp
* @property {string} correlationId
* @property {string} [dataId]
* @property {string} [error]
* @property {string} [message]
*/
/**
* Downlink data result when processing or completing data transfer to the device.
*
* @typedef {Object} AppDlDataResult
* @property {string} dataId
* @property {number} status
* @property {string} [message]
*/
/**
* Connection status event.
*
* @event ApplicationMgr#status
* @type {Status}
*/
/**
* @typedef {Object} AppMgrMsgHandlers
* @property {OnAppUlData} onUlData
* @property {OnAppDlDataResp} onDlDataResp
* @property {OnAppDlDataResult} onDlDataResult
*/
/**
* @callback OnAppUlData
* @param {ApplicationMgr} mgr
* @param {AppUlData} data
* @param {function} callback
* @param {?Error} callback.err Use error to NACK the message.
*/
/**
* @callback OnAppDlDataResp
* @param {ApplicationMgr} mgr
* @param {AppDlDataResp} data
* @param {function} callback
* @param {?Error} callback.err Use error to NACK the message.
*/
/**
* @callback OnAppDlDataResult
* @param {ApplicationMgr} mgr
* @param {AppDlDataResult} data
* @param {function} callback
* @param {?Error} callback.err Use error to NACK the message.
*/
/**
* The manager for application queues.
*
* @class ApplicationMgr
* @fires ApplicationMgr#status
*/
class ApplicationMgr extends EventEmitter {
/**
* @param {Map<string, Connection>} connPool
* @param {URL} hostUri
* @param {Options} opts
* @param {AppMgrMsgHandlers} handler
* @throws {Error} Wrong arguments.
*/
constructor(connPool, hostUri, opts, handler) {
super();
if (!connPool || !(connPool instanceof Map)) {
throw Error('`connPool` is not a Connection pool map');
} else if (!hostUri || !(hostUri instanceof URL) || !URL.canParse(hostUri.toString())) {
throw Error('`hostUri` is not a valid URI');
} else if (!opts || typeof opts !== DataTypes.Object || Array.isArray(opts)) {
throw Error('`opts` is not an object');
} else if (!opts.unitId) {
throw Error('`opts.unitId` cannot be empty for application');
} else if (!handler || typeof handler !== DataTypes.Object || Array.isArray(handler)) {
throw Error('`handler` is not an object');
} else if (
typeof handler.onUlData !== DataTypes.Function ||
typeof handler.onDlDataResp !== DataTypes.Function ||
typeof handler.onDlDataResult !== DataTypes.Function
) {
throw Error('`onUlData`, `onDlDataResp` and `onDlDataResult` must be functions');
}
const conn = getConnection(connPool, hostUri);
const queues = newDataQueues(conn, opts, QUEUE_PREFIX, false);
conn.conn.connect();
this.#opts = { ...opts };
this.#connPool = connPool;
this.#hostUri = hostUri.toString();
this.#uldata = queues.uldata;
this.#dldata = queues.dldata;
this.#dldataResp = queues.dldataResp;
this.#dldataResult = queues.dldataResult;
this.#status = MgrStatus.NotReady;
this.#mgrMsgHandler = handler;
this.#uldata.on(Events.Status, this.#gmqStatusHandler.bind(this));
this.#uldata.setMsgHandler(this.#gmqMsgHandler.bind(this));
this.#uldata.connect();
this.#dldata.on(Events.Status, this.#gmqStatusHandler.bind(this));
this.#dldata.setMsgHandler(this.#gmqMsgHandler.bind(this));
this.#dldata.connect();
this.#dldataResp.on(Events.Status, this.#gmqStatusHandler.bind(this));
this.#dldataResp.setMsgHandler(this.#gmqMsgHandler.bind(this));
this.#dldataResp.connect();
this.#dldataResult.on(Events.Status, this.#gmqStatusHandler.bind(this));
this.#dldataResult.setMsgHandler(this.#gmqMsgHandler.bind(this));
this.#dldataResult.connect();
conn.count += 4;
}
/**
* @returns {string} The associated unit ID of the application.
*/
unitId() {
return this.#opts.unitId;
}
/**
* @returns {string} The associated unit code of the application.
*/
unitCode() {
return this.#opts.unitCode;
}
/**
* @returns {string} The application ID.
*/
id() {
return this.#opts.id;
}
/**
* @returns {string} The application code.
*/
name() {
return this.#opts.name;
}
/**
* @returns {MgrStatus} Manager status.
*/
status() {
return this.#status;
}
/**
* @returns {DataMqStatus} Manager status.
*/
mqStatus() {
return {
uldata: this.#uldata.status(),
dldata: this.#dldata.status(),
dldataResp: this.#dldataResp.status(),
dldataResult: this.#dldataResult.status(),
ctrl: Status.Closed,
};
}
/**
* To close the manager queues.
* The underlying connection will be closed when there are no queues use it.
*
* @param {function} callback
* @param {?Error} callback.err
*/
close(callback) {
const self = this;
async.waterfall(
[
function (cb) {
self.#uldata.removeAllListeners();
self.#uldata.close((err) => {
cb(err || null);
});
},
function (cb) {
self.#dldata.removeAllListeners();
self.#dldata.close((err) => {
cb(err || null);
});
},
function (cb) {
self.#dldataResp.removeAllListeners();
self.#dldataResp.close((err) => {
cb(err || null);
});
},
function (cb) {
self.#dldataResult.removeAllListeners();
self.#dldataResult.close((err) => {
cb(err || null);
});
},
function (cb) {
removeConnection(self.#connPool, self.#hostUri, 4, (err) => {
cb(err || null);
});
},
],
callback
);
}
/**
* Send downlink data `AppDlData` to the broker.
*
* @param {AppDlData} data
* @param {function} callback
* @param {?Error} callback.err
* @throws {Error} Wrong arguments.
*/
sendDlData(data, callback) {
if (!data || typeof data !== DataTypes.Object || Array.isArray(data)) {
throw Error('`data` is not an object');
} else if (!data.correlationId || typeof data.correlationId !== DataTypes.String) {
throw Error(ErrParamCorrId);
} else if (data.deviceId !== undefined && typeof data.deviceId !== DataTypes.String) {
throw Error('`data.deviceId` is not a string');
} else if (data.networkCode !== undefined && typeof data.networkCode !== DataTypes.String) {
throw Error('`data.networkCode` is not a string');
} else if (data.networkAddr !== undefined && typeof data.networkAddr !== DataTypes.String) {
throw Error('`data.networkAddr` is not a string');
} else if (!(data.data instanceof Buffer)) {
throw Error('`data.data` is not a Buffer');
} else if (
data.extension !== undefined &&
(!data.extension ||
typeof data.extension !== DataTypes.Object ||
Array.isArray(data.extension))
) {
throw Error('`data.extension` is not an object');
}
if (!data.deviceId) {
if ((data.networkCode && !data.networkAddr) || (!data.networkCode && data.networkAddr)) {
throw Error(Errors.ErrParamDev);
}
}
const dldata = {
correlationId: data.correlationId,
deviceId: data.deviceId || undefined,
networkCode: data.networkCode || undefined,
networkAddr: data.networkAddr || undefined,
data: data.data.toString('hex'),
extension: data.extension || undefined,
};
const payload = Buffer.from(JSON.stringify(dldata));
this.#dldata.sendMsg(payload, (err) => {
callback(err || null);
});
}
/**
* The handler for the gmq.Queue#status events.
*/
#gmqStatusHandler(_queue, _status) {
let status;
if (
this.#uldata.status() === Status.Connected &&
this.#dldata.status() === Status.Connected &&
this.#dldataResp.status() === Status.Connected &&
this.#dldataResult.status() === Status.Connected
) {
status = MgrStatus.Ready;
} else {
status = MgrStatus.NotReady;
}
if (this.#status === status) {
return;
}
this.#status = status;
this.emit(Events.Status, status);
}
/**
* The message handler for the gmq.Queue.
*/
#gmqMsgHandler(queue, msg) {
let data;
try {
data = JSON.parse(msg.payload.toString());
} catch (e) {
queue.ack(msg, (_err) => {});
return;
}
const self = this;
if (queue.name() === this.#uldata.name()) {
data.time = new Date(data.time);
data.pub = new Date(data.pub);
data.data = Buffer.from(data.data, 'hex');
this.#mgrMsgHandler.onUlData(this, data, (err) => {
if (err) {
self.#uldata.nack(msg, (_err) => {});
} else {
self.#uldata.ack(msg, (_err) => {});
}
});
} else if (queue.name() === this.#dldataResp.name()) {
this.#mgrMsgHandler.onDlDataResp(this, data, (err) => {
if (err) {
self.#dldataResp.nack(msg, (_err) => {});
} else {
self.#dldataResp.ack(msg, (_err) => {});
}
});
} else if (queue.name() === this.#dldataResult.name()) {
this.#mgrMsgHandler.onDlDataResult(this, data, (err) => {
if (err) {
self.#dldataResult.nack(msg, (_err) => {});
} else {
self.#dldataResult.ack(msg, (_err) => {});
}
});
} else E{
return;
}
}
/** @type {Options} */
#opts;
/**
* Information for delete connection automatically.
*
* @type {Map<string, Connection>}
*/
#connPool;
/**
* Information for delete connection automatically.
*
* @type {string}
*/
#hostUri;
/** @type {AmqpQueue|MqttQueue} */
#uldata;
/** @type {AmqpQueue|MqttQueue} */
#dldata;
/** @type {AmqpQueue|MqttQueue} */
#dldataResp;
/** @type {AmqpQueue|MqttQueue} */
#dldataResult;
/** @type {Status} */
#status;
/** @type {AppMgrMsgHandlers} */
#mgrMsgHandler;
}
const QUEUE_PREFIX = 'broker.application';
module.exports = {
ApplicationMgr,
};
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