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handle observable errors

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This commit is contained in:
MrTuxedo
2023-04-22 11:38:11 -07:00
parent 34f7f23ae8
commit ef228254b3
3 changed files with 19 additions and 5 deletions
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14
src/blockchain.ts
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@ -1,7 +1,8 @@
import 'dotenv/config.js';
import { WebSocketProvider, formatUnits } from 'ethers';
import { Observable } from 'rxjs';
import { map, scan } from 'rxjs/operators';
import { sortBy } from 'lodash';
import { Observable, throwError } from 'rxjs';
import { catchError, map, scan, retry } from 'rxjs/operators';
import { GasPrices } from '../types/gasPrices';
@ -16,13 +17,14 @@ const blockGasPricesObservable = new Observable<GasPrices>((observer) => {
if (!block) throw new Error(`Error fetching block! ${blockNumber}`);
const gasPrices = block.prefetchedTransactions.map((tx) => tx.gasPrice).sort();
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"));
// Log averages every 10 blocks
if (blockNumber % 10 == 0) console.log(`Found new block data for ${blockNumber}! Base average transaction cost: ${slow} Gwei`)
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`)
observer.next({ fast, average, slow } as GasPrices);
} catch (error) {
@ -46,7 +48,9 @@ const averageGasPricesObservable = blockGasPricesObservable.pipe(
average: Math.round(average / blocks.length),
slow: Math.round(slow / blocks.length),
} as GasPrices;
})
}),
catchError(err => throwError(() => new Error(err))),
retry(2)
);
export { averageGasPricesObservable };