tardis-dev/dist/mappers/bitnomial.js

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

import { parseμs, upperCaseSymbols } from "../handy.js";
export const bitnomialTradesMapper = {
    canHandle(message) {
        return message.type === 'trade';
    },
    getFilters(symbols) {
        symbols = upperCaseSymbols(symbols);
        return [
            {
                channel: 'trade',
                symbols
            }
        ];
    },
    *map(message, localTimestamp) {
        const timestamp = new Date(message.timestamp);
        timestamp.μs = parseμs(message.timestamp);
        yield {
            type: 'trade',
            symbol: message.symbol,
            exchange: 'bitnomial',
            id: String(message.ack_id),
            price: Number(message.price),
            amount: Number(message.quantity),
            side: message.taker_side === 'Bid' ? 'buy' : 'sell',
            timestamp,
            localTimestamp: localTimestamp
        };
    }
};
const mapBookLevel = (level) => {
    return { price: level[0], amount: level[1] };
};
export class BitnomialBookChangMapper {
    canHandle(message) {
        return message.type === 'book' || message.type === 'level';
    }
    getFilters(symbols) {
        symbols = upperCaseSymbols(symbols);
        return [
            {
                channel: 'book',
                symbols
            },
            {
                channel: 'level',
                symbols
            }
        ];
    }
    *map(message, localTimestamp) {
        const timestamp = new Date(message.timestamp);
        timestamp.μs = parseμs(message.timestamp);
        if (message.type === 'book') {
            yield {
                type: 'book_change',
                symbol: message.symbol,
                exchange: 'bitnomial',
                isSnapshot: true,
                bids: message.bids.map(mapBookLevel),
                asks: message.asks.map(mapBookLevel),
                timestamp,
                localTimestamp
            };
        }
        else {
            const update = {
                price: message.price,
                amount: message.quantity
            };
            yield {
                type: 'book_change',
                symbol: message.symbol,
                exchange: 'bitnomial',
                isSnapshot: false,
                bids: message.side === 'Bid' ? [update] : [],
                asks: message.side === 'Ask' ? [update] : [],
                timestamp,
                localTimestamp: localTimestamp
            };
        }
    }
}
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