tardis-dev/dist/realtimefeeds/blockchaincom.js

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

import { wait } from "../handy.js";
import { RealTimeFeedBase } from "./realtimefeed.js";
export class BlockchainComRealTimeFeed extends RealTimeFeedBase {
    wssURL = 'wss://ws.blockchain.info/mercury-gateway/v1/ws';
    originHeader = 'https://exchange.blockchain.com';
    mapToSubscribeMessages(filters) {
        const subs = filters
            .map((filter) => {
            if (!filter.symbols || filter.symbols.length === 0) {
                throw new Error('BlockchainComRealTimeFeed requires explicitly specified symbols when subscribing to live feed');
            }
            return filter.symbols.map((symbol) => {
                return {
                    action: 'subscribe',
                    channel: filter.channel,
                    symbol
                };
            });
        })
            .flatMap((f) => f);
        return subs;
    }
    messageIsError(message) {
        return message.event === 'rejected';
    }
    messageIsHeartbeat(msg) {
        return msg.channel === 'heartbeat';
    }
    async onConnected() {
        this.send({
            action: 'subscribe',
            channel: 'heartbeat'
        });
        await wait(0);
    }
}
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