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Robert Habermeier
3465c18b71
* scheduler: handle re-scheduling around finalization correctly * also make sure parathreads get cleaned * run scheduling in finalization * Remove stray println! * Update the schedule call site in inclusion inherent * Clarify subtlety around SessionStartBlock * Remove double semi-colon * reschedule prior to `availability_cores` and in on-initialize * improve docs * fix line * more doc reformat * remove unneeded call * avoid unnecessary scheduling on initialize * split `clear` and `schedule * Update runtime/parachains/src/scheduler.rs Co-authored-by: Sergei Shulepov <sergei@parity.io> Co-authored-by: Sergei Shulepov <sergei@parity.io>
32 lines
1.5 KiB
Markdown
32 lines
1.5 KiB
Markdown
# Validator Groups
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Yields the validator groups used during the current session. The validators in the groups are referred to by their index into the validator-set and this is assumed to be as-of the child of the block whose state is being queried.
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```rust
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/// A helper data-type for tracking validator-group rotations.
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struct GroupRotationInfo {
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session_start_block: BlockNumber,
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group_rotation_frequency: BlockNumber,
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now: BlockNumber, // The successor of the block in whose state this runtime API is queried.
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}
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impl GroupRotationInfo {
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/// Returns the index of the group needed to validate the core at the given index,
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/// assuming the given amount of cores/groups.
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fn group_for_core(&self, core_index, cores) -> GroupIndex;
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/// Returns the block number of the next rotation after the current block. If the current block
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/// is 10 and the rotation frequency is 5, this should return 15.
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fn next_rotation_at(&self) -> BlockNumber;
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/// Returns the block number of the last rotation before or including the current block. If the
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/// current block is 10 and the rotation frequency is 5, this should return 10.
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fn last_rotation_at(&self) -> BlockNumber;
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}
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/// Returns the validator groups and rotation info localized based on the block whose state
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/// this is invoked on. Note that `now` in the `GroupRotationInfo` should be the successor of
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/// the number of the block.
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fn validator_groups(at: Block) -> (Vec<Vec<ValidatorIndex>>, GroupRotationInfo);
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```
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