ethereum.istanbul.utils.messageethereum.muir_glacier.utils.message
Hardfork Utility Functions For The Message Data-structure ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. contents:: Table of Contents :backlinks: none :local:
Introduction
Message specific functions used in this istanbul version ofMessage specific functions used in this muir_glacier 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.
should_transfer_value :
if True ETH should be transferred while executing a message call.
is_static:
if True then it prevents all state-changing operations from being
executed.
Returns
message:
Items containing contract creation or message call specific data.ethereum.istanbul.vm.Messageethereum.muir_glacier.vm.Message
def prepare_message(caller: Address, target: Union[Bytes0, Address], value: U256, data: Bytes, gas: Uint, env: Environment, code_address: Optional[Address], should_transfer_value: bool, is_static: bool) -> Message:
36 | """ |
---|---|
37 | Execute a transaction against the provided environment. |
38 |
|
39 | Parameters |
40 | ---------- |
41 | caller : |
42 | Address which initiated the transaction |
43 | target : |
44 | Address whose code will be executed |
45 | value : |
46 | Value to be transferred. |
47 | data : |
48 | Array of bytes provided to the code in `target`. |
49 | gas : |
50 | Gas provided for the code in `target`. |
51 | env : |
52 | Environment for the Ethereum Virtual Machine. |
53 | code_address : |
54 | This is usually same as the `target` address except when an alternative |
55 | accounts code needs to be executed. |
56 | eg. `CALLCODE` calling a precompile. |
57 | should_transfer_value : |
58 | if True ETH should be transferred while executing a message call. |
59 | is_static: |
60 | if True then it prevents all state-changing operations from being |
61 | executed. |
62 |
|
63 | Returns |
64 | ------- |
65 | message: `ethereum.istanbul.vm.Message` |
65 | message: `ethereum.muir_glacier.vm.Message` |
66 | Items containing contract creation or message call specific data. |
67 | """ |
68 | if isinstance(target, Bytes0): |
69 | current_target = compute_contract_address( |
70 | caller, |
71 | get_account(env.state, caller).nonce - U256(1), |
72 | ) |
73 | msg_data = Bytes(b"") |
74 | code = data |
75 | elif isinstance(target, Address): |
76 | current_target = target |
77 | msg_data = data |
78 | code = get_account(env.state, target).code |
79 | if code_address is None: |
80 | code_address = target |
81 | else: |
82 | raise AssertionError("Target must be address or empty bytes") |
83 | |
84 | return Message( |
85 | caller=caller, |
86 | target=target, |
87 | gas=gas, |
88 | value=value, |
89 | data=msg_data, |
90 | code=code, |
91 | depth=Uint(0), |
92 | current_target=current_target, |
93 | code_address=code_address, |
94 | should_transfer_value=should_transfer_value, |
95 | is_static=is_static, |
96 | parent_evm=None, |
97 | ) |