t8ntool / evm transaction structure unit test interface

[winsvega]

a protocol/command to run transaction structure unit tests.
input: transaction rlp, fork rule
output: bool valid/invalid, recovered sender if any

Rationale

We have ttTransactionTests which are currently not maintained. the paradigm require a client opinion on whether provided transaction structure is valid or not.

By asking a client if it thinks the provided transaction rlp is good or not (hypothetically) without any state, env info, we can revive the ttTransaction tests that test transaction structure parsing.

Implementation

• Geth accept transaction rlp
• Checks the structure validity (number of fields for given transaction type, validity of RLP format)
• Checks that fields are in allowed range (0...2 ** 256), max data length, 2 ** 64 for gasLimit (rules might be different depending on fork)
• Checks that gasLimit cover intrinsic transaction price (intrinsic transaction price + data bytes price)
• Recovers sender address