@neabyte/chart-to-image/dist/utils/provider.js

Convert trading charts to images using Node.js canvas with advanced features: 6 chart types, VWAP/EMA/SMA indicators, custom colors, themes, hide elements, scaling, and PNG/JPEG export formats.

import ccxt from 'ccxt';
export class DataProvider {
    exchange;
    config;
    constructor(config) {
        this.config = config;
        this.exchange = this.createExchange();
    }
    createExchange() {
        const exchangeClass = ccxt[this.config.name];
        if (!exchangeClass) {
            throw new Error(`Unsupported exchange: ${this.config.name}`);
        }
        const exchange = new exchangeClass({
            apiKey: this.config.apiKey,
            secret: this.config.secret,
            sandbox: this.config.sandbox || false,
            enableRateLimit: true
        });
        return exchange;
    }
    async fetchOHLCV(symbol, timeframe, limit = 100) {
        try {
            await this.exchange.loadMarkets();
            const ohlcv = await this.exchange.fetchOHLCV(symbol, timeframe, undefined, limit);
            return ohlcv.map((candle) => {
                const candleArray = candle;
                return {
                    timestamp: candleArray[0],
                    open: candleArray[1],
                    high: candleArray[2],
                    low: candleArray[3],
                    close: candleArray[4],
                    volume: candleArray[5]
                };
            });
        }
        catch (error) {
            throw new Error(`Failed to fetch data: ${error instanceof Error ? error.message : 'Unknown error'}`);
        }
    }
    getExchangeInfo() {
        return {
            name: this.config.name,
            sandbox: this.config.sandbox,
            markets: this.exchange.markets,
            timeframes: this.exchange.timeframes
        };
    }
    async isSymbolSupported(symbol) {
        try {
            await this.exchange.loadMarkets();
            return symbol in this.exchange.markets;
        }
        catch {
            return false;
        }
    }
    getSupportedTimeframes() {
        return Object.keys(this.exchange.timeframes || {});
    }
}