easy-currencies
Version:
A tool for easy conversion of currencies.
155 lines • 11.1 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Converter = exports.Convert = void 0;
const requester_1 = require("./parts/requester");
const config_1 = require("./parts/config");
var chainer_1 = require("./parts/chainer");
Object.defineProperty(exports, "Convert", { enumerable: true, get: function () { return chainer_1.Chainer; } });
const utils_1 = require("./parts/utils");
const axios_1 = __importDefault(require("axios"));
/**
* Regular converter class definition.
*
* @export
* @class Converter
*/
class Converter {
/**
* Creates an instance of Converter.
* @param {(...ProviderReference[] | undefined[] | string[])} config
* @memberof Converter
*/
constructor(...config) {
/**
* Method to set the proxy configuration.
* @param proxyConfiguration The proxy configuration.
*/
this.setProxyConfiguration = (proxyConfiguration) => {
this.config.setClient(axios_1.default.create({ proxy: proxyConfiguration }));
};
/**
* Conversion function (non chainable).
*
* @example
* const converter = new Converter()
* const converted = await converter.convert(15,"USD","EUR")
* console.log(converted);
*
* @param {number} amount - amount to be converted
* @param {string} from - base currency
* @param {string} to - conversion currency
* @param {any} rates - conversion rates, if they were pre-fetched
* @returns {Promise<number>} - converted amount
*/
this.convert = (amount_1, from_1, to_1, ...args_1) => __awaiter(this, [amount_1, from_1, to_1, ...args_1], void 0, function* (amount, from, to, rates = undefined) {
// Returining conversion from provided rates
if (typeof rates !== "undefined") {
return this.convertRate(amount, to, rates);
}
//Fetching conversion rates from the active provider
const [err, data] = yield (0, utils_1._to)(this.getRates(from, to, false));
if (err) {
throw err;
}
if (!data || Object.keys(data).length == 0) {
throw new Error("No data returned for rate fetch.");
}
// Normalizing resulting rates data
return this.convertRate(amount, to, data);
});
/**
* Performs safe multiplication to get the result amount.
* @param {number} amount - amount to be converted
* @param {string} to - conversion currency
* @param {any} rates - conversion rates, if they were pre-fetched
* @returns
*/
this.convertRate = (amount, to, rates = undefined) => {
const keys = Object.keys(rates);
const rateKey = keys.find(key => key.toLowerCase() === to.toLowerCase());
const rate = rateKey ? rates[rateKey] : undefined;
if (!rate) {
throw new Error(`No '${to}' present in rates: ${JSON.stringify(rates, null, 2)}`);
}
const numericRate = parseFloat(rate);
if (isNaN(numericRate)) {
throw new Error(`Invalid rate value for '${to}': ${rate}`);
}
return amount * numericRate;
};
/**
* Rate fetch function
* @param {string} from - base currency
* @param {string} to - conversion currency
* @param {boolean} multiple - determines conversion mode
* @returns
*/
this.getRates = (from_2, to_2, ...args_2) => __awaiter(this, [from_2, to_2, ...args_2], void 0, function* (from, to, multiple = false) {
// Getting the current active provider
const provider = this.config.activeProvider();
// Getting the client
const client = this.config.getClient();
// Fetching conversion rates from the active provider.
const [err, data] = yield (0, utils_1._to)((0, requester_1.fetchRates)(client, provider, {
FROM: from,
TO: to,
multiple: multiple
}));
// error handling:
// if the error is not in the registered list of errors (is undefined), then throw.
// if the error is in the list, but there are no backup providers, then throw.
// if the error is in the list and there is a backup, log the error and continue.
if (!err) {
return provider.handler(data);
}
// unrecognized error
if (!err.handled) {
throw err.error;
}
// logging existing error
console.error(err.error);
if (this.config.providers.length <= 1) {
throw err.error;
}
// removing current provider from active list
this.config.remove(provider);
// Retrying...
return this.getRates(from, to, multiple);
});
this.config = new config_1.Config(...config);
// Forwarding config adder function (with the alternative handle)
this.add = this.config.add;
this.addProvider = this.config.add;
// Forwarding config multiple adder function (with the alternative handle)
this.addMultiple = this.config.addMultiple;
this.addMultipleProviders = this.config.addMultiple;
this.remove = this.config.remove;
}
/**
* Getters for active providers
*
* @readonly
* @type {Provider[]}
* @memberof Converter
*/
get providers() {
return this.config.providers;
}
get active() {
return this.config.providers;
}
}
exports.Converter = Converter;
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