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add some more docs on PreRuntime digests (#4896)

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Robert Habermeier
2020-02-12 13:15:49 +01:00
committed by GitHub
parent 3f3910ccaf
commit b3cf97940c
1 changed files with 6 additions and 0 deletions
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substrate/primitives/runtime/src/generic/digest.rs
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@@ -87,6 +87,12 @@ pub enum DigestItem<Hash> {
/// the consensus engine can (and should) read them itself to avoid
/// code and state duplication. It is erroneous for a runtime to produce
/// these, but this is not (yet) checked.
///
/// NOTE: the runtime is not allowed to panic or fail in an `on_initialize`
/// call if an expected `PreRuntime` digest is not present. It is the
/// responsibility of a external block verifier to check this. Runtime API calls
/// will initialize the block without pre-runtime digests, so initialization
/// cannot fail when they are missing.
PreRuntime(ConsensusEngineId, Vec<u8>),
/// A message from the runtime to the consensus engine. This should *never*