□$╲□■*#░@~▒▫■█○$□╲*░$!◆╲?□▓$$░■╱!&╲$█╱╲?#░╱*▒&■▫╳%╲□▒*░╲▫$□█▒!&■

1import EVM from 0xe467b9dd11fa00df
2
3transaction(hexEncodedTxs: [String], coinbase: String) {
4    execute {
5        let txs: [[UInt8]] = []
6        for tx in hexEncodedTxs {
7            txs.append(tx.decodeHex())
8        }
9
10        // If there's only one tx, use `EVM.run`.
11        // If there are more, then use `EVM.batchRun`
12        if txs.length == 1 {
13            let txResult = EVM.run(
14                tx: txs[0],
15                coinbase: EVM.addressFromString(coinbase)
16            )
17            assert(
18                txResult.status == EVM.Status.failed || txResult.status == EVM.Status.successful,
19                message: "evm_error=\(txResult.errorMessage);evm_error_code=\(txResult.errorCode)"
20            )
21            return
22        }
23
24        let txResults = EVM.batchRun(
25            txs: txs,
26            coinbase: EVM.addressFromString(coinbase)
27        )
28
29        // If at least one of the EVM transactions in the batch is either
30        // failed or successful, in other words not invalid, we let the
31        // Cadence transaction succeed.
32        for txResult in txResults {
33            if txResult.status == EVM.Status.failed || txResult.status == EVM.Status.successful {
34                return
35            }
36        }
37
38        // Otherwise, all EVM transactions are invalid txs and can't be
39        // executed (such as nonce too low).
40        // In this case, we fail the Cadence transaction with the error
41        // message from the first EVM transaction.
42        for txResult in txResults {
43            assert(
44                txResult.status == EVM.Status.failed || txResult.status == EVM.Status.successful,
45                message: "evm_error=\(txResult.errorMessage);evm_error_code=\(txResult.errorCode)"
46            )
47        }
48    }
49}