74 lines
2.9 KiB
JavaScript
74 lines
2.9 KiB
JavaScript
import { getErrorMessage, } from './helpers';
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export class HistoryProvider {
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constructor(datafeedUrl, requester) {
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this._datafeedUrl = datafeedUrl;
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this._requester = requester;
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}
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getBars(symbolInfo, resolution, periodParams) {
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const requestParams = {
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symbol: symbolInfo.ticker || '',
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resolution: resolution,
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from: periodParams.from,
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to: periodParams.to,
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};
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if (periodParams.countBack !== undefined) {
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requestParams.countback = periodParams.countBack;
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}
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if (symbolInfo.currency_code !== undefined) {
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requestParams.currencyCode = symbolInfo.currency_code;
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}
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if (symbolInfo.unit_id !== undefined) {
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requestParams.unitId = symbolInfo.unit_id;
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}
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return new Promise((resolve, reject) => {
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this._requester.sendRequest(this._datafeedUrl, 'history', requestParams)
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.then((response) => {
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if (response.s !== 'ok' && response.s !== 'no_data') {
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reject(response.errmsg);
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return;
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}
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const bars = [];
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const meta = {
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noData: false,
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};
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if (response.s === 'no_data') {
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meta.noData = true;
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meta.nextTime = response.nextTime;
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}
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else {
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const volumePresent = response.v !== undefined;
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const ohlPresent = response.o !== undefined;
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for (let i = 0; i < response.t.length; ++i) {
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const barValue = {
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time: response.t[i] * 1000,
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close: parseFloat(response.c[i]),
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open: parseFloat(response.c[i]),
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high: parseFloat(response.c[i]),
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low: parseFloat(response.c[i]),
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};
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if (ohlPresent) {
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barValue.open = parseFloat(response.o[i]);
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barValue.high = parseFloat(response.h[i]);
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barValue.low = parseFloat(response.l[i]);
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}
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if (volumePresent) {
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barValue.volume = parseFloat(response.v[i]);
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}
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bars.push(barValue);
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}
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}
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resolve({
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bars: bars,
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meta: meta,
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});
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})
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.catch((reason) => {
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const reasonString = getErrorMessage(reason);
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// tslint:disable-next-line:no-console
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console.warn(`HistoryProvider: getBars() failed, error=${reasonString}`);
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reject(reasonString);
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});
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});
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}
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}
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