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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| import { | ||
| Connection, | ||
| Transaction, | ||
| TransactionInstruction, | ||
| PublicKey, | ||
| ComputeBudgetProgram, | ||
| } from '@solana/web3.js'; | ||
|
|
||
| // Add priority fee according to 50th percentile of recent fees paid | ||
| const DEFAULT_FEE_PERCENTILE = 0.5; | ||
|
|
||
| export async function addComputeBudget( | ||
| connection: Connection, | ||
| transaction: Transaction, | ||
| lockedWritableAccounts: PublicKey[] = [], | ||
| ): Promise<void> { | ||
| const ixs = await determineComputeBudget( | ||
| connection, | ||
| transaction, | ||
| lockedWritableAccounts, | ||
| ); | ||
| transaction.add(...ixs); | ||
| } | ||
|
|
||
| export async function determineComputeBudget( | ||
| connection: Connection, | ||
| transaction: Transaction, | ||
| lockedWritableAccounts: PublicKey[] = [], | ||
| feePercentile: number = DEFAULT_FEE_PERCENTILE, | ||
| ): Promise<TransactionInstruction[]> { | ||
| let computeBudget = 250_000; | ||
| let priorityFee = 1; | ||
|
|
||
| try { | ||
| const simulateResponse = await connection.simulateTransaction(transaction); | ||
|
|
||
| if (simulateResponse?.value?.unitsConsumed) { | ||
| // Set compute budget to 120% of the units used in the simulated transaction | ||
| computeBudget = Math.round(simulateResponse.value.unitsConsumed * 1.2); | ||
| } | ||
|
|
||
| priorityFee = await determinePriorityFee( | ||
| connection, | ||
| lockedWritableAccounts, | ||
| feePercentile, | ||
| ); | ||
| } catch (e) { | ||
| console.error(`Failed to get compute budget for Solana transaction: ${e}`); | ||
| } | ||
|
|
||
| console.info(`Setting Solana compute unit budget to ${computeBudget} units`); | ||
| console.info( | ||
| `Setting Solana compute unit price to ${priorityFee} microLamports`, | ||
| ); | ||
|
|
||
| return [ | ||
| ComputeBudgetProgram.setComputeUnitLimit({ | ||
| units: computeBudget, | ||
| }), | ||
| ComputeBudgetProgram.setComputeUnitPrice({ | ||
| microLamports: priorityFee, | ||
| }), | ||
| ]; | ||
| } | ||
|
|
||
| async function determinePriorityFee( | ||
| connection: Connection, | ||
| lockedWritableAccounts: PublicKey[] = [], | ||
| percentile: number, | ||
| ): Promise<number> { | ||
| // https://twitter.com/0xMert_/status/1768669928825962706 | ||
|
|
||
| let fee = 1; // Set fee to 100,000 microlamport by default | ||
|
|
||
| try { | ||
| const recentFeesResponse = await connection.getRecentPrioritizationFees({ | ||
| lockedWritableAccounts, | ||
| }); | ||
|
|
||
| if (recentFeesResponse) { | ||
| // Get 75th percentile fee paid in recent slots | ||
| const recentFees = recentFeesResponse | ||
| .map((dp) => dp.prioritizationFee) | ||
| .filter((dp) => dp > 0) | ||
| .sort((a, b) => a - b); | ||
|
|
||
| if (recentFees.length > 0) { | ||
| const medianFee = | ||
| recentFees[Math.floor(recentFees.length * percentile)]; | ||
| fee = Math.max(fee, medianFee); | ||
| } | ||
| } | ||
| } catch (e) { | ||
| console.error('Error fetching Solana recent fees', e); | ||
| } | ||
|
|
||
| return fee; | ||
| } |
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