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/*jslint node: true, nomen: true, regexp: true, plusplus: true */ |
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(function () { |
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"use strict"; |
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const request = require("request"), |
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RateLimiter = require("limiter").RateLimiter; |
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class BlockUtils { |
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constructor(apiUrl, magicToken, signalApiUrl, perSecondRateLimit) |
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{ |
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this.API_URL = apiUrl; |
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this.MAGIC_TOKEN = magicToken; |
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this.SIGNAL_API_URL = signalApiUrl; |
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this.limiter = new RateLimiter(perSecondRateLimit, 'second'); |
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} |
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/** |
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* Allow to use callback-style methods with promises |
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* @param {Array} args Original function arguments |
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* @param {Number} optionsOffset Expected offset of the options object in the arguments |
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* @callback |
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* @private |
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*/ |
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_handlePromises(args, optionsOffset, callback) { |
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let fCallback = args[args.length - 1]; |
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const checkArgsAndGo = (options = {}) => { |
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if (args[optionsOffset] !== fCallback) { |
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options = args[optionsOffset]; |
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} |
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callback(options, fCallback); |
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}; |
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if (typeof fCallback === "function") { |
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return checkArgsAndGo(); |
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} |
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return new Promise((resolve, reject) => { |
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fCallback = (err, res) => { |
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if (err) { return reject(err); } |
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return resolve(res); |
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}; |
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checkArgsAndGo(); |
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}); |
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} |
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/** |
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* Make and return the call to the API |
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* @param endpoint |
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* @param callback |
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* @private |
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*/ |
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call() { |
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return this._handlePromises(arguments, 1, ({ |
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useSignalAPI = false, |
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method = "GET", |
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body = null |
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} = {}, callback) => { |
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this.limiter.removeTokens(1, () => { |
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request({ |
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method: method, |
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url: ((useSignalAPI) ? this.SIGNAL_API_URL : this.API_URL) + arguments[0], |
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headers: {"magic": this.MAGIC_TOKEN}, |
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body: body |
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}, (err, result, body) => { |
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try { |
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const tBody = JSON.parse(body); |
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return callback(null, tBody); |
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} catch (e) { |
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// Exceptions for plain text responses |
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if (body === "success") { |
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return callback(null, body); |
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} else if (body === "fail") { |
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return callback(new Error("FAIL")); |
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} |
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return callback(e, body); |
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} |
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}); |
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}); |
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}); |
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} |
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/** |
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* Parse and format a token pair |
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* @param tokenStr String containing the token (ie. "XRP/BTC", "AEON", "USD-LTC", ...) |
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* @returns {*} Structure with base & token values (default base is BTC) |
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* @private |
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*/ |
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parseToken(tokenStr) { |
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// Token is already parsed |
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if (typeof tokenStr === "object") { return tokenStr; } |
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// Check token format |
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if (tokenStr.indexOf("/") > -1) { // Classic representation |
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const [token, base] = tokenStr.split("/"); |
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return {base, token}; |
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} else if(tokenStr.indexOf("-") > -1) { // Inversed one |
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const [base, token] = tokenStr.split("-"); |
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return {base, token}; |
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} else { // Raw token without attached base |
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return {base: "BTC", token: tokenStr}; |
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} |
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} |
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/** |
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* Create a new fake device to use with Blockfolio & return the Blockfolio instance |
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* @callback |
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* @private |
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*/ |
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generateClientToken() { |
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return parseInt(Math.random().toString().substring(2)).toString(12); |
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} |
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} |
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module.exports = BlockUtils; |
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})(); |
bob6664569 /
blockfolio-api-client
