Fail when decoding from storage and not all bytes consumed#1897
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Fail when decoding from storage and not all bytes consumed#1897
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xgreenx
reviewed
Sep 13, 2023
SkymanOne
approved these changes
Oct 23, 2023
crates/engine/src/ext.rs
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| /// Returns the decoded contract storage at the key if any. | ||
| pub fn get_storage(&mut self, key: &[u8], output: &mut &mut [u8]) -> Result { | ||
| pub fn get_storage(&mut self, key: &[u8]) -> core::result::Result<&[u8], Error> { |
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Can't you just import the full path?
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There was a type alias here type Result = core::result::Result<(), Error>;. However I've just removed that and replaced its usages with the explicit type.
| if input.is_empty() { | ||
| Ok(res) | ||
| } else { | ||
| Err("Input buffer has still data left after decoding!".into()) |
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Perhaps would be useful to give the length of the remaining bytes left in a buffer for debugging purposes
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I'm not sure it is worth bringing in all the string formatting machinery in for that...we need to be mindful of code size.
It's possible to debug this without this information by fetching the data at the given key and attempting to decode it into the respective type.
🦑 📈 ink! Example Contracts ‒ Changes Report 📉 🦑These are the results when building the
Link to the run | Last update: Mon Oct 23 16:46:07 CEST 2023 |
smiasojed
approved these changes
Oct 24, 2023
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Closes #1804.
If a contract previously relied on successful decoding which does not consume all bytes, then recompiling with a version of
ink!which includes this change will cause that contract to trap at runtime when attempting to decode.See the new
fn decode_allforStorableimpls. It just copies theDecodeAllimpl fromparity-scale-codecwhich is very simple.todo
integration-testfor possible migration pattern #1909)take_contract_storage