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Add ext_terminate (#5234)

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With this patch forward this will be the only way for
a contract to destroy itself. This patch therefore changes
the semantics of all other contract initiated balance
transfers to fail if they would bring the caller below the
existential deposit.
This commit is contained in:
Alexander Theißen
2020-03-17 11:51:34 +01:00
committed by GitHub
parent e91d4be998
commit 601f2538c6
5 changed files with 377 additions and 97 deletions
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substrate/frame/contracts/COMPLEXITY.md
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@@ -350,6 +350,20 @@ Loading `init_code` and `input_data` should be charged in any case.
**complexity**: All complexity comes from loading buffers and executing `instantiate` executive function. The former component is proportional to the sizes of `init_code`, `value` and `input_data` buffers. The latter component completely depends on the complexity of `instantiate` executive function and also dominated by it.
## ext_terminate
This function receives the following arguments:
- `beneficiary`, buffer of a marshaled `AccountId`
It consists of the following steps:
1. Loading `beneficiary` buffer from the sandbox memory (see sandboxing memory get) and then decoding it.
Loading of the `beneficiary` buffer should be charged. This is because the sizes of buffers are specified by the calling code, even though marshaled representations are, essentially, of constant size. This can be fixed by assigning an upper bound for sizes of `AccountId`.
**complexity**: All complexity comes from loading buffers and executing `terminate` executive function. The former component is proportional to the size of the `beneficiary` buffer. The latter component completely depends on the complexity of `terminate` executive function and also dominated by it.
## ext_return
This function receives a `data` buffer as an argument. Execution of the function consists of the following steps: