tardis-dev/dist/realtimefeeds/okexspreads.js

Convenient access to tick-level historical and real-time cryptocurrency market data via Node.js

import crypto from 'crypto';
import { wait } from "../handy.js";
import { RealTimeFeedBase } from "./realtimefeed.js";
export class OkexSpreadsRealTimeFeed extends RealTimeFeedBase {
    wssURL = 'wss://ws.okx.com:8443/ws/v5/business';
    _hasCredentials = process.env.OKX_API_KEY !== undefined;
    secondsSinceEpoch() {
        return Math.floor(Date.now() / 1000);
    }
    async onConnected() {
        if (this._hasCredentials) {
            const timestamp = this.secondsSinceEpoch().toString();
            const sign = crypto.createHmac('sha256', process.env.OKX_API_SECRET_KEY).update(`${timestamp}GET/users/self/verify`).digest('base64');
            this.send({
                op: 'login',
                args: [
                    {
                        apiKey: process.env.OKX_API_KEY,
                        passphrase: process.env.OKX_API_PASSPHRASE,
                        timestamp,
                        sign
                    }
                ]
            });
            await wait(50);
        }
    }
    mapToSubscribeMessages(filters) {
        const args = filters
            .map((filter) => {
            if (!filter.symbols || filter.symbols.length === 0) {
                throw new Error(`${this._exchange} RealTimeFeed requires explicitly specified symbols when subscribing to live feed`);
            }
            return filter.symbols.map((symbol) => {
                return {
                    channel: filter.channel,
                    sprdId: symbol
                };
            });
        })
            .flatMap((s) => s);
        return [
            {
                op: 'subscribe',
                args: [...new Set(args)]
            }
        ];
    }
    messageIsError(message) {
        return message.event === 'error';
    }
}
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