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Implement Runtime APIs (#1411)

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* create a README on Runtime APIs

* add ParaId type

* write up runtime APIs

* more preamble

* rename

* rejig runtime APIs

* add occupied_since to `BlockNumber`

* skeleton crate for runtime API subsystem

* improve group_for_core

* improve docs on availability cores runtime API

* guide: freed -> free

* add primitives for runtime APIs

* create a v1 ParachainHost API trait

* guide: make validation code return `Option`al.

* skeleton runtime API helpers

* make parachain-host runtime-generic

* skeleton for most runtime API implementation functions

* guide: add runtime API helper methods

* implement new helpers of the inclusion module

* guide: remove retries check, as it is unneeded

* implement helpers for scheduler module for Runtime APIs

* clean up `validator_groups` implementation

* implement next_rotation_at and last_rotation_at

* guide: more helpers on GroupRotationInfo

* almost finish implementing runtime APIs

* add explicit block parameter to runtime API fns

* guide: generalize number parameter

* guide: add group_responsible to occupied-core

* update primitives due to guide changes

* finishing touches on runtime API implementation; squash warnings

* break out runtime API impl to separate file

* add tests for next_up logic

* test group rotation info

* point to filed TODO

* remove unused TODO [now]

* indentation

* guide: para -> para_id

* rename para field to para_id for core meta

* remove reference to outdated AvailabilityCores type

* add an event in `inclusion` for candidates being included or timing out

* guide: candidate events

* guide: adjust language

* Candidate events type from guide and adjust inclusion event

* implement `candidate_events` runtime API

* fix runtime test compilation

* max -> min

* fix typos

* guide: add `RuntimeAPIRequest::CandidateEvents`
This commit is contained in:
Robert Habermeier
2020-07-18 16:01:51 -04:00
committed by GitHub
parent 5624bd8bf4
commit dddde219a2
18 changed files with 1151 additions and 33 deletions
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polkadot/roadmap/implementers-guide/src/runtime/scheduler.md
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@@ -198,3 +198,6 @@ Actions:
- `core_para(CoreIndex) -> ParaId`: return the currently-scheduled or occupied ParaId for the given core.
- `group_validators(GroupIndex) -> Option<Vec<ValidatorIndex>>`: return all validators in a given group, if the group index is valid for this session.
- `availability_timeout_predicate() -> Option<impl Fn(CoreIndex, BlockNumber) -> bool>`: returns an optional predicate that should be used for timing out occupied cores. if `None`, no timing-out should be done. The predicate accepts the index of the core, and the block number since which it has been occupied. The predicate should be implemented based on the time since the last validator group rotation, and the respective parachain and parathread timeouts, i.e. only within `max(config.chain_availability_period, config.thread_availability_period)` of the last rotation would this return `Some`.
- `group_rotation_info() -> GroupRotationInfo`: Returns a helper for determining group rotation.
- `next_up_on_available(CoreIndex) -> Option<ScheduledCore>`: Return the next thing that will be scheduled on this core assuming it is currently occupied and the candidate occupying it became available. Returns in `ScheduledCore` format (todo: link to Runtime APIs page; linkcheck doesn't allow this right now). For parachains, this is always the ID of the parachain and no specified collator. For parathreads, this is based on the next item in the `ParathreadQueue` assigned to that core, and is `None` if there isn't one.
- `next_up_on_time_out(CoreIndex) -> Option<ScheduledCore>`: Return the next thing that will be scheduled on this core assuming it is currently occupied and the candidate occupying it timed out. Returns in `ScheduledCore` format (todo: link to Runtime APIs page; linkcheck doesn't allow this right now). For parachains, this is always the ID of the parachain and no specified collator. For parathreads, this is based on the next item in the `ParathreadQueue` assigned to that core, or if there isn't one, the claim that is currently occupying the core. Otherwise `None`.