metaapi.cloud-sdk
Version:
SDK for MetaApi, a professional cloud forex API which includes MetaTrader REST API and MetaTrader websocket API. Supports both MetaTrader 5 (MT5) and MetaTrader 4 (MT4). CopyFactory copy trading API included. (https://metaapi.cloud)
196 lines (195 loc) • 27.9 kB
JavaScript
'use strict';
import SynchronizationListener from '../clients/metaApi/synchronizationListener';
import moment from 'moment';
import Reservoir from './reservoir/reservoir';
import LoggerManager from '../logger';
let ConnectionHealthMonitor = class ConnectionHealthMonitor extends SynchronizationListener {
/**
* Starts health monitor
*/ start() {
const updateQuoteHealthStatusInterval = ()=>{
this._updateQuoteHealthStatus();
this._updateQuoteHealthStatusInterval = setTimeout(updateQuoteHealthStatusInterval.bind(this), this._getRandomTimeout());
};
this._updateQuoteHealthStatusInterval = setTimeout(updateQuoteHealthStatusInterval.bind(this), this._getRandomTimeout());
const measureUptimeInterval = ()=>{
this._measureUptime();
this._measureUptimeInterval = setTimeout(measureUptimeInterval.bind(this), this._getRandomTimeout());
};
this._measureUptimeInterval = setTimeout(measureUptimeInterval.bind(this), this._getRandomTimeout());
}
/**
* Stops health monitor
*/ stop() {
this._logger.debug(`${this._connection.account.id}: Stopping the monitor`);
clearTimeout(this._updateQuoteHealthStatusInterval);
clearTimeout(this._measureUptimeInterval);
}
/**
* Invoked when a symbol price was updated
* @param {String} instanceIndex index of an account instance connected
* @param {MetatraderSymbolPrice} price updated MetaTrader symbol price
*/ onSymbolPriceUpdated(instanceIndex, price) {
try {
let brokerTimestamp = moment(price.brokerTime).toDate().getTime();
this._priceUpdatedAt = new Date();
this._offset = this._priceUpdatedAt.getTime() - brokerTimestamp;
} catch (err) {
// eslint-disable-next-line no-console
this._logger.error(`${this._connection.account.id}: Failed to update quote ` + 'streaming health status on price update', err);
}
}
/**
* Invoked when a server-side application health status is received from MetaApi
* @param {String} instanceIndex index of an account instance connected
* @param {HealthStatus} status server-side application health status
* @return {Promise} promise which resolves when the asynchronous event is processed
*/ onHealthStatus(instanceIndex, status) {
this._serverHealthStatus['' + instanceIndex] = status;
}
/**
* Invoked when connection to MetaTrader terminal terminated
* @param {String} instanceIndex index of an account instance connected
* @return {Promise} promise which resolves when the asynchronous event is processed
*/ onDisconnected(instanceIndex) {
delete this._serverHealthStatus['' + instanceIndex];
}
/**
* Returns server-side application health status
* @return {HealthStatus} server-side application health status
*/ get serverHealthStatus() {
let result;
for (let s of Object.values(this._serverHealthStatus)){
if (!result) {
result = s;
} else {
for (let field of Object.keys(s)){
result[field] = result[field] || s[field];
}
}
}
return result || {};
}
/**
* Connection health status
* @typedef {Object} ConnectionHealthStatus
* @property {Boolean} connected flag indicating successful connection to API server
* @property {Boolean} connectedToBroker flag indicating successful connection to broker
* @property {Boolean} quoteStreamingHealthy flag indicating that quotes are being streamed successfully from the
* broker
* @property {Boolean} synchronized flag indicating a successful synchronization
* @property {Boolean} healthy flag indicating overall connection health status
* @property {String} message health status message
*/ /**
* Returns health status
* @returns {ConnectionHealthStatus} connection health status
*/ // eslint-disable-next-line complexity
get healthStatus() {
let status = {
connected: this._connection.terminalState.connected,
connectedToBroker: this._connection.terminalState.connectedToBroker,
quoteStreamingHealthy: this._quotesHealthy,
synchronized: this._connection.synchronized
};
status.healthy = status.connected && status.connectedToBroker && status.quoteStreamingHealthy && status.synchronized;
let message;
if (status.healthy) {
message = 'Connection to broker is stable. No health issues detected.';
} else {
message = 'Connection is not healthy because ';
let reasons = [];
if (!status.connected) {
reasons.push('connection to API server is not established or lost');
}
if (!status.connectedToBroker) {
reasons.push('connection to broker is not established or lost');
}
if (!status.synchronized) {
reasons.push('local terminal state is not synchronized to broker');
}
if (!status.quoteStreamingHealthy) {
reasons.push('quotes are not streamed from the broker properly');
}
message = message + reasons.join(' and ') + '.';
}
status.message = message;
return status;
}
/**
* Returns uptime in percents measured over specific periods of time
* @returns {Object} uptime in percents measured over specific periods of time
*/ get uptime() {
let uptime = {};
for (let e of Object.entries(this._uptimeReservoirs)){
uptime[e[0]] = e[1].getStatistics().average;
}
return uptime;
}
_measureUptime() {
try {
Object.values(this._uptimeReservoirs).forEach((r)=>r.pushMeasurement(this._connection.terminalState.connected && this._connection.terminalState.connectedToBroker && this._connection.synchronized && this._quotesHealthy ? 100 : 0));
} catch (err) {
// eslint-disable-next-line no-console
this._logger.error('failed to measure uptime for account ' + this._connection.account.id, err);
}
}
// eslint-disable-next-line complexity
_updateQuoteHealthStatus() {
try {
let serverDateTime = moment(new Date(Date.now() - this._offset));
let serverTime = serverDateTime.format('HH:mm:ss.SSS');
let dayOfWeek = serverDateTime.day();
let daysOfWeek = {
0: 'SUNDAY',
1: 'MONDAY',
2: 'TUESDAY',
3: 'WEDNESDAY',
4: 'THURSDAY',
5: 'FRIDAY',
6: 'SATURDAY'
};
let inQuoteSession = false;
if (!this._priceUpdatedAt) {
this._priceUpdatedAt = new Date();
}
if (!(this._connection.subscribedSymbols || []).length) {
this._priceUpdatedAt = new Date();
}
for (let symbol of this._connection.subscribedSymbols || []){
let specification = this._connection.terminalState.specification(symbol) || {};
let quoteSessions = (specification.quoteSessions || [])[daysOfWeek[dayOfWeek]] || [];
for (let session of quoteSessions){
if (session.from <= serverTime && session.to >= serverTime) {
inQuoteSession = true;
}
}
}
this._quotesHealthy = !this._connection.subscribedSymbols.length || !inQuoteSession || Date.now() - this._priceUpdatedAt.getTime() < this._minQuoteInterval;
} catch (err) {
this._logger.error('failed to update quote streaming health status for account ' + this._connection.account.id, err);
}
}
_getRandomTimeout() {
return (Math.random() * 59 + 1) * 1000;
}
/**
* Constructs the listener
* @param {StreamingMetaApiConnection} connection MetaApi connection instance
*/ constructor(connection){
super();
this._connection = connection;
this._minQuoteInterval = 60000;
this._serverHealthStatus = {};
this._uptimeReservoirs = {
'5m': new Reservoir(300, 5 * 60 * 1000),
'1h': new Reservoir(600, 60 * 60 * 1000),
'1d': new Reservoir(24 * 60, 24 * 60 * 60 * 1000),
'1w': new Reservoir(24 * 7, 7 * 24 * 60 * 60 * 1000)
};
this._logger = LoggerManager.getLogger('ConnectionHealthMonitor');
}
};
/**
* Tracks connection health status
*/ export { ConnectionHealthMonitor as default };
//# sourceMappingURL=data:application/json;base64,{"version":3,"sources":["<anon>"],"sourcesContent":["'use strict';\n\nimport SynchronizationListener from '../clients/metaApi/synchronizationListener';\nimport moment from 'moment';\nimport Reservoir from './reservoir/reservoir';\nimport LoggerManager from '../logger';\n\n/**\n * Tracks connection health status\n */\nexport default class ConnectionHealthMonitor extends SynchronizationListener {\n\n  /**\n   * Constructs the listener\n   * @param {StreamingMetaApiConnection} connection MetaApi connection instance\n   */\n  constructor(connection) {\n    super();\n    this._connection = connection;\n    this._minQuoteInterval = 60000;\n    this._serverHealthStatus = {};\n    this._uptimeReservoirs = {\n      '5m': new Reservoir(300, 5 * 60 * 1000),\n      '1h': new Reservoir(600, 60 * 60 * 1000),\n      '1d': new Reservoir(24 * 60, 24 * 60 * 60 * 1000),\n      '1w': new Reservoir(24 * 7, 7 * 24 * 60 * 60 * 1000),\n    };\n    this._logger = LoggerManager.getLogger('ConnectionHealthMonitor');\n  }\n\n  /**\n   * Starts health monitor\n   */\n  start() {\n    const updateQuoteHealthStatusInterval = () => {\n      this._updateQuoteHealthStatus();\n      this._updateQuoteHealthStatusInterval = setTimeout(\n        updateQuoteHealthStatusInterval.bind(this),\n        this._getRandomTimeout()\n      );\n    };\n    this._updateQuoteHealthStatusInterval = setTimeout(\n      updateQuoteHealthStatusInterval.bind(this),\n      this._getRandomTimeout()\n    );\n    const measureUptimeInterval = () => {\n      this._measureUptime();\n      this._measureUptimeInterval = setTimeout(measureUptimeInterval.bind(this), this._getRandomTimeout());\n    };\n    this._measureUptimeInterval = setTimeout(measureUptimeInterval.bind(this), this._getRandomTimeout());\n  }\n\n  /**\n   * Stops health monitor\n   */\n  stop() {\n    this._logger.debug(`${this._connection.account.id}: Stopping the monitor`);\n    clearTimeout(this._updateQuoteHealthStatusInterval);\n    clearTimeout(this._measureUptimeInterval);\n  }\n\n  /**\n   * Invoked when a symbol price was updated\n   * @param {String} instanceIndex index of an account instance connected\n   * @param {MetatraderSymbolPrice} price updated MetaTrader symbol price\n   */\n  onSymbolPriceUpdated(instanceIndex, price) {\n    try {\n      let brokerTimestamp = moment(price.brokerTime).toDate().getTime();\n      this._priceUpdatedAt = new Date();\n      this._offset = this._priceUpdatedAt.getTime() - brokerTimestamp;\n    } catch (err) {\n      // eslint-disable-next-line no-console\n      this._logger.error(`${this._connection.account.id}: Failed to update quote ` + \n        'streaming health status on price update', err);\n    }\n  }\n\n  /**\n   * Invoked when a server-side application health status is received from MetaApi\n   * @param {String} instanceIndex index of an account instance connected\n   * @param {HealthStatus} status server-side application health status\n   * @return {Promise} promise which resolves when the asynchronous event is processed\n   */\n  onHealthStatus(instanceIndex, status) {\n    this._serverHealthStatus['' + instanceIndex] = status;\n  }\n\n  /**\n   * Invoked when connection to MetaTrader terminal terminated\n   * @param {String} instanceIndex index of an account instance connected\n   * @return {Promise} promise which resolves when the asynchronous event is processed\n   */\n  onDisconnected(instanceIndex) {\n    delete this._serverHealthStatus['' + instanceIndex];\n  }\n\n  /**\n   * Returns server-side application health status\n   * @return {HealthStatus} server-side application health status\n   */\n  get serverHealthStatus() {\n    let result;\n    for (let s of Object.values(this._serverHealthStatus)) {\n      if (!result) {\n        result = s;\n      } else {\n        for (let field of Object.keys(s)) {\n          result[field] = result[field] || s[field];\n        }\n      }\n    }\n    return result || {};\n  }\n\n  /**\n   * Connection health status\n   * @typedef {Object} ConnectionHealthStatus\n   * @property {Boolean} connected flag indicating successful connection to API server\n   * @property {Boolean} connectedToBroker flag indicating successful connection to broker\n   * @property {Boolean} quoteStreamingHealthy flag indicating that quotes are being streamed successfully from the\n   * broker\n   * @property {Boolean} synchronized flag indicating a successful synchronization\n   * @property {Boolean} healthy flag indicating overall connection health status\n   * @property {String} message health status message\n   */\n\n  /**\n   * Returns health status\n   * @returns {ConnectionHealthStatus} connection health status\n   */\n  // eslint-disable-next-line complexity\n  get healthStatus() {\n    let status = {\n      connected: this._connection.terminalState.connected,\n      connectedToBroker: this._connection.terminalState.connectedToBroker,\n      quoteStreamingHealthy: this._quotesHealthy,\n      synchronized: this._connection.synchronized\n    };\n    status.healthy = status.connected && status.connectedToBroker && status.quoteStreamingHealthy &&\n      status.synchronized;\n    let message;\n    if (status.healthy) {\n      message = 'Connection to broker is stable. No health issues detected.';\n    } else {\n      message = 'Connection is not healthy because ';\n      let reasons = [];\n      if (!status.connected) {\n        reasons.push('connection to API server is not established or lost');\n      }\n      if (!status.connectedToBroker) {\n        reasons.push('connection to broker is not established or lost');\n      }\n      if (!status.synchronized) {\n        reasons.push('local terminal state is not synchronized to broker');\n      }\n      if (!status.quoteStreamingHealthy) {\n        reasons.push('quotes are not streamed from the broker properly');\n      }\n      message = message + reasons.join(' and ') + '.';\n    }\n    status.message = message;\n    return status;\n  }\n\n  /**\n   * Returns uptime in percents measured over specific periods of time\n   * @returns {Object} uptime in percents measured over specific periods of time\n   */\n  get uptime() {\n    let uptime = {};\n    for (let e of Object.entries(this._uptimeReservoirs)) {\n      uptime[e[0]] = e[1].getStatistics().average;\n    }\n    return uptime;\n  }\n\n  _measureUptime() {\n    try {\n      Object.values(this._uptimeReservoirs).forEach(r => r.pushMeasurement(this._connection.terminalState.connected &&\n        this._connection.terminalState.connectedToBroker && this._connection.synchronized &&\n        this._quotesHealthy ? 100 : 0));\n    } catch (err) {\n      // eslint-disable-next-line no-console\n      this._logger.error('failed to measure uptime for account ' +\n        this._connection.account.id, err);\n    }\n  }\n\n  // eslint-disable-next-line complexity\n  _updateQuoteHealthStatus() {\n    try {\n      let serverDateTime = moment(new Date(Date.now() - this._offset));\n      let serverTime = serverDateTime.format('HH:mm:ss.SSS');\n      let dayOfWeek = serverDateTime.day();\n      let daysOfWeek = {\n        0: 'SUNDAY',\n        1: 'MONDAY',\n        2: 'TUESDAY',\n        3: 'WEDNESDAY',\n        4: 'THURSDAY',\n        5: 'FRIDAY',\n        6: 'SATURDAY'\n      };\n      let inQuoteSession = false;\n      if (!this._priceUpdatedAt) {\n        this._priceUpdatedAt = new Date();\n      }\n      if (!(this._connection.subscribedSymbols || []).length) {\n        this._priceUpdatedAt = new Date();\n      }\n      for (let symbol of this._connection.subscribedSymbols || []) {\n        let specification = this._connection.terminalState.specification(symbol) || {};\n        let quoteSessions = (specification.quoteSessions || [])[daysOfWeek[dayOfWeek]] || [];\n        for (let session of quoteSessions) {\n          if (session.from <= serverTime && session.to >= serverTime) {\n            inQuoteSession = true;\n          }\n        }\n      }\n      this._quotesHealthy = !this._connection.subscribedSymbols.length || !inQuoteSession ||\n        (Date.now() - this._priceUpdatedAt.getTime() < this._minQuoteInterval);\n    } catch (err) {\n      this._logger.error('failed to update 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