ethereum.frontier.utils.message
Hardfork Utility Functions For The Message Data-structure ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. contents:: Table of Contents :backlinks: none :local:
Introduction
Message specific functions used in this frontier version of specification.
prepare_message
Execute a transaction against the provided environment.
Parameters
caller :
Address which initiated the transaction
target :
Address whose code will be executed
value :
Value to be transferred.
data :
Array of bytes provided to the code in target
.
gas :
Gas provided for the code in target
.
env :
Environment for the Ethereum Virtual Machine.
code_address :
This is usually same as the target
address except when an alternative
accounts code needs to be executed.
eg. CALLCODE
calling a precompile.
Returns
message: ethereum.frontier.vm.Message
Items containing contract creation or message call specific data.
def prepare_message(caller: Address, target: Union[Bytes0, Address], value: U256, data: Bytes, gas: Uint, env: Environment, code_address: Optional[Address]) -> Message:
33 | """ |
---|---|
34 | Execute a transaction against the provided environment. |
35 |
|
36 | Parameters |
37 | ---------- |
38 | caller : |
39 | Address which initiated the transaction |
40 | target : |
41 | Address whose code will be executed |
42 | value : |
43 | Value to be transferred. |
44 | data : |
45 | Array of bytes provided to the code in `target`. |
46 | gas : |
47 | Gas provided for the code in `target`. |
48 | env : |
49 | Environment for the Ethereum Virtual Machine. |
50 | code_address : |
51 | This is usually same as the `target` address except when an alternative |
52 | accounts code needs to be executed. |
53 | eg. `CALLCODE` calling a precompile. |
54 |
|
55 | Returns |
56 | ------- |
57 | message: `ethereum.frontier.vm.Message` |
58 | Items containing contract creation or message call specific data. |
59 | """ |
60 | if isinstance(target, Bytes0): |
61 | current_target = compute_contract_address( |
62 | caller, |
63 | get_account(env.state, caller).nonce - U256(1), |
64 | ) |
65 | msg_data = Bytes(b"") |
66 | code = data |
67 | elif isinstance(target, Address): |
68 | current_target = target |
69 | msg_data = data |
70 | code = get_account(env.state, target).code |
71 | if code_address is None: |
72 | code_address = target |
73 | else: |
74 | raise AssertionError("Target must be address or empty bytes") |
75 | |
76 | return Message( |
77 | caller=caller, |
78 | target=target, |
79 | gas=gas, |
80 | value=value, |
81 | data=msg_data, |
82 | code=code, |
83 | depth=Uint(0), |
84 | current_target=current_target, |
85 | code_address=code_address, |
86 | parent_evm=None, |
87 | ) |