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Handle local storage race conditions better (#3177)

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* Make local_storage_compare_and_set take Option for old_value

* Adapt srml/im-online to API changes

* Bump version

* Bump version again

* Replace match
This commit is contained in:
Michael Müller
2019-07-26 01:42:40 +02:00
committed by Gavin Wood
parent af914e9f40
commit 23fba990ba
11 changed files with 118 additions and 33 deletions
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substrate/core/sr-io/without_std.rs
+16 -3
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@@ -1055,14 +1055,27 @@ impl OffchainApi for () {
}
}
fn local_storage_compare_and_set(kind: offchain::StorageKind, key: &[u8], old_value: &[u8], new_value: &[u8]) -> bool {
fn local_storage_compare_and_set(
kind: offchain::StorageKind,
key: &[u8],
old_value: Option<&[u8]>,
new_value: &[u8],
) -> bool {
let (ptr, len) = match old_value {
Some(old_value) => (
old_value.as_ptr(),
old_value.len() as u32,
),
None => (0 as *const u8, u32::max_value()),
};
unsafe {
ext_local_storage_compare_and_set.get()(
kind.into(),
key.as_ptr(),
key.len() as u32,
old_value.as_ptr(),
old_value.len() as u32,
ptr,
len,
new_value.as_ptr(),
new_value.len() as u32,
) == 0