tardis-dev/dist/mappers/blockchaincom.js

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

import { upperCaseSymbols } from "../handy.js";
export class BlockchainComTradesMapper {
    canHandle(message) {
        return message.channel === 'trades' && message.event === 'updated';
    }
    getFilters(symbols) {
        symbols = upperCaseSymbols(symbols);
        return [
            {
                channel: 'trades',
                symbols
            }
        ];
    }
    *map(message, localTimestamp) {
        yield {
            type: 'trade',
            symbol: message.symbol,
            exchange: 'blockchain-com',
            id: message.trade_id,
            price: message.price,
            amount: message.qty,
            side: message.side === 'sell' ? 'sell' : 'buy',
            timestamp: new Date(message.timestamp),
            localTimestamp: localTimestamp
        };
    }
}
export class BlockchainComBookChangeMapper {
    canHandle(message) {
        return message.channel == 'l2' && (message.event === 'snapshot' || message.event === 'updated');
    }
    getFilters(symbols) {
        symbols = upperCaseSymbols(symbols);
        return [
            {
                channel: 'l2',
                symbols
            }
        ];
    }
    *map(message, localTimestamp) {
        yield {
            type: 'book_change',
            symbol: message.symbol,
            exchange: 'blockchain-com',
            isSnapshot: message.event === 'snapshot',
            bids: message.bids.map(this.mapBookLevel),
            asks: message.asks.map(this.mapBookLevel),
            timestamp: new Date(message.timestamp),
            localTimestamp
        };
    }
    mapBookLevel(level) {
        return { price: level.px, amount: level.qty };
    }
}
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