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Optimize price API response size reduce the number of query to that API

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This commit is contained in:
nymkappa
2023-02-23 13:13:20 +09:00
parent 1375982c51
commit a1905f624f
6 changed files with 132 additions and 50 deletions
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8
backend/src/api/mining/mining-routes.ts
View File

@@ -41,7 +41,13 @@ class MiningRoutes {
res.header('Pragma', 'public');
res.header('Cache-control', 'public');
res.setHeader('Expires', new Date(Date.now() + 1000 * 300).toUTCString());
res.status(200).send(await PricesRepository.$getHistoricalPrice());
if (req.query.timestamp) {
res.status(200).send(await PricesRepository.$getNearestHistoricalPrice(
parseInt(<string>req.query.timestamp ?? 0, 10)
));
} else {
res.status(200).send(await PricesRepository.$getHistoricalPrices());
}
} catch (e) {
res.status(500).send(e instanceof Error ? e.message : e);
}

45
backend/src/repositories/PricesRepository.ts
View File

@@ -104,9 +104,48 @@ class PricesRepository {
return rates[0];
}
public async $getHistoricalPrice(): Promise<Conversion | null> {
public async $getNearestHistoricalPrice(timestamp: number | undefined): Promise<Conversion | null> {
try {
const [rates]: any[] = await DB.query(`SELECT *, UNIX_TIMESTAMP(time) as time FROM prices ORDER BY time DESC`);
const [rates]: any[] = await DB.query(`
SELECT *, UNIX_TIMESTAMP(time) AS time
FROM prices
WHERE UNIX_TIMESTAMP(time) < ?
ORDER BY time DESC
LIMIT 1`,
[timestamp]
);
if (!rates) {
throw Error(`Cannot get single historical price from the database`);
}
// Compute fiat exchange rates
const latestPrice = await this.$getLatestConversionRates();
const exchangeRates: ExchangeRates = {
USDEUR: Math.round(latestPrice.EUR / latestPrice.USD * 100) / 100,
USDGBP: Math.round(latestPrice.GBP / latestPrice.USD * 100) / 100,
USDCAD: Math.round(latestPrice.CAD / latestPrice.USD * 100) / 100,
USDCHF: Math.round(latestPrice.CHF / latestPrice.USD * 100) / 100,
USDAUD: Math.round(latestPrice.AUD / latestPrice.USD * 100) / 100,
USDJPY: Math.round(latestPrice.JPY / latestPrice.USD * 100) / 100,
};
return {
prices: rates,
exchangeRates: exchangeRates
};
} catch (e) {
logger.err(`Cannot fetch single historical prices from the db. Reason ${e instanceof Error ? e.message : e}`);
return null;
}
}
public async $getHistoricalPrices(): Promise<Conversion | null> {
try {
const [rates]: any[] = await DB.query(`
SELECT *, UNIX_TIMESTAMP(time) AS time
FROM prices
ORDER BY time DESC
`);
if (!rates) {
throw Error(`Cannot get average historical price from the database`);
}
@@ -127,7 +166,7 @@ class PricesRepository {
exchangeRates: exchangeRates
};
} catch (e) {
logger.err(`Cannot fetch averaged historical prices from the db. Reason ${e instanceof Error ? e.message : e}`);
logger.err(`Cannot fetch historical prices from the db. Reason ${e instanceof Error ? e.message : e}`);
return null;
}
}