Refactor to compute GasPrices differently

This commit is contained in:
MrTuxedo 2023-04-22 15:57:20 -07:00
parent ef228254b3
commit f78674578b
3 changed files with 35 additions and 31 deletions

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@ -1,6 +1,5 @@
import 'dotenv/config.js';
import { WebSocketProvider, formatUnits } from 'ethers';
import { sortBy } from 'lodash';
import { Observable, throwError } from 'rxjs';
import { catchError, map, scan, retry } from 'rxjs/operators';
@ -10,47 +9,51 @@ const rpcUrl = process.env.RPC_URL || "wss://ropsten.infura.io/ws/v3/YOUR_INFURA
const provider = new WebSocketProvider(rpcUrl);
const blockGasPricesObservable = new Observable<GasPrices>((observer) => {
const blockBaseFeePerGasObservable$ = new Observable<number>((observer) => {
provider.on('block', async (blockNumber) => {
try {
const block = await provider.getBlock(blockNumber, true);
const { baseFeePerGas } = await provider.getBlock(blockNumber, true) || {};
if (!block) throw new Error(`Error fetching block! ${blockNumber}`);
const gasPrices = sortBy(block.prefetchedTransactions, ['gasPrice']).map(x => x.gasPrice);
const fast = Number(formatUnits(gasPrices[Math.floor(gasPrices.length * 0.9)], "gwei"));
const average = Number(formatUnits(gasPrices[Math.floor(gasPrices.length / 2)], "gwei"));
const slow = Number(formatUnits(gasPrices[Math.floor(gasPrices.length * 0.05)], "gwei"));
if (!baseFeePerGas) throw new Error(`Error fetching block! ${blockNumber}`);
// Log averages every 10 blocks
if (blockNumber % 10 == 0) console.log(`Found new block data for ${blockNumber}!
Gas price spreads: ${fast.toFixed(2)} 🚶 ${average.toFixed(2)} 🐢 ${slow.toFixed(2)} Gwei`)
if (blockNumber % 10 == 0) console.log(
`Found new block data for ${blockNumber}! Gas price: 🐢 ${Number(formatUnits(baseFeePerGas, "gwei")).toFixed(2)} Gwei`
)
observer.next({ fast, average, slow } as GasPrices);
observer.next(Number(formatUnits(baseFeePerGas, "gwei")));
} catch (error) {
observer.error(`Error fetching block! ${error}`);
}
});
});
const averageGasPricesObservable = blockGasPricesObservable.pipe(
scan((acc, curr) => [...acc.slice(-19), curr], [] as GasPrices[]),
map((blocks) => {
const { fast, average, slow } = blocks
.reduce((sum, block) =>
({ // Find sums
fast: sum.fast + block.fast,
average: sum.average + block.average,
slow: sum.slow + block.slow
}), { fast: 0, average: 0, slow: 0 } as GasPrices);
return { // Then average them
fast: Math.round(fast / blocks.length),
average: Math.round(average / blocks.length),
slow: Math.round(slow / blocks.length),
} as GasPrices;
const baseGasPricesObservable$ = blockBaseFeePerGasObservable$.pipe(
scan<number, GasPrices>(
(acc: GasPrices, curr: number): GasPrices => {
// Keep only the 20 latest values
const values: number[] = acc.values ? [...acc.values.slice(-19), curr] : [curr];
const fast: number = Math.max(...values);
const slow: number = Math.min(...values);
const sum: number = values.reduce((a, b) => a + b, 0);
const average: number = sum / values.length;
return { values, fast, slow, average };
},
{ values: [], fast: -Infinity, slow: Infinity, average: NaN } // Initial value
),
// Only emit the computed prices
map<GasPrices, GasPrices>((computedGasPrices: GasPrices): GasPrices => {
const { fast, average, slow } = computedGasPrices;
return {
fast: Math.round(fast),
average: Math.round(average),
slow: Math.round(slow)
};
}),
catchError(err => throwError(() => new Error(err))),
retry(2)
);
export { averageGasPricesObservable };
export { baseGasPricesObservable$ };

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@ -9,7 +9,7 @@ import fs from 'node:fs';
import path from 'node:path';
import { ActivityType, GatewayIntentBits } from 'discord.js';
import { averageGasPricesObservable } from './blockchain';
import { baseGasPricesObservable$ } from './blockchain';
import { deployCommands } from './deploy';
import { DiscordClient } from './discordClient';
import { createGasAlertChecker } from './gasAlertChecker';
@ -76,7 +76,7 @@ client.login(token)
})
.then(() => {
// Start listening to blockchain
averageGasPricesObservable.subscribe({
baseGasPricesObservable$.subscribe({
next: async (averageGasPrices) => {
setDiscordStatus(averageGasPrices);
await redisClient.set('current-prices', JSON.stringify(averageGasPrices))

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@ -2,4 +2,5 @@ export interface GasPrices {
fast: number;
average: number;
slow: number;
}
values?: number[];
}