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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/executor/src/wasm_executor.rs
+13 -6
View File
@@ -949,17 +949,24 @@ impl_function_executor!(this: FunctionExecutor<'e, E>,
.map_err(|_| "storage kind OOB while ext_local_storage_compare_and_set: wasm")?;
let key = this.memory.get(key, key_len as usize)
.map_err(|_| "OOB while ext_local_storage_compare_and_set: wasm")?;
let old_value = this.memory.get(old_value, old_value_len as usize)
.map_err(|_| "OOB while ext_local_storage_compare_and_set: wasm")?;
let new_value = this.memory.get(new_value, new_value_len as usize)
.map_err(|_| "OOB while ext_local_storage_compare_and_set: wasm")?;
let res = this.ext.offchain()
.map(|api| api.local_storage_compare_and_set(kind, &key, &old_value, &new_value))
.ok_or_else(|| "Calling unavailable API ext_local_storage_compare_andset: wasm")?;
let res = {
if old_value == u32::max_value() {
this.ext.offchain()
.map(|api| api.local_storage_compare_and_set(kind, &key, None, &new_value))
.ok_or_else(|| "Calling unavailable API ext_local_storage_compare_and_set: wasm")?
} else {
let v = this.memory.get(old_value, old_value_len as usize)
.map_err(|_| "OOB while ext_local_storage_compare_and_set: wasm")?;
this.ext.offchain()
.map(|api| api.local_storage_compare_and_set(kind, &key, Some(v.as_slice()), &new_value))
.ok_or_else(|| "Calling unavailable API ext_local_storage_compare_and_set: wasm")?
}
};
Ok(if res { 0 } else { 1 })
},
ext_http_request_start(
method: *const u8,