tardis-dev/dist/realtimefeeds/bitnomial.js

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

import { RealTimeFeedBase } from "./realtimefeed.js";
export class BitnomialRealTimeFeed extends RealTimeFeedBase {
    wssURL = 'wss://bitnomial.com/exchange/ws';
    channelMappings = {
        book: ['book', 'level']
    };
    mapToSubscribeMessages(filters) {
        const channelsToSubscribe = filters
            .map((filter) => {
            if (!filter.symbols || filter.symbols.length === 0) {
                throw new Error('BitnomialRealTimeFeed requires explicitly specified symbols when subscribing to live feed');
            }
            const subscribeToBookChannel = this.channelMappings.book.includes(filter.channel);
            let channel;
            if (subscribeToBookChannel) {
                channel = 'book';
            }
            else {
                channel = filter.channel;
            }
            return {
                name: channel,
                product_codes: filter.symbols
            };
        })
            .reduce((prev, current) => {
            const matchingExisting = prev.find((c) => c.name === current.name);
            if (matchingExisting !== undefined) {
                for (const symbol of current.product_codes) {
                    if (matchingExisting.product_codes.includes(symbol) === false) {
                        matchingExisting.product_codes.push(symbol);
                    }
                }
            }
            else {
                prev.push(current);
            }
            return prev;
        }, []);
        return [
            {
                type: 'subscribe',
                product_codes: [],
                channels: channelsToSubscribe
            }
        ];
    }
    messageIsError(message) {
        return message.type === 'error' || message.type === 'disconnect';
    }
}
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