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past-session validator discovery APIs (#2009)

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* guide: fix formatting for SessionInfo module

* primitives: SessionInfo type

* punt on approval keys

* ah, revert the type alias

* session info runtime module skeleton

* update the guide

* runtime/configuration: sync with the guide

* runtime/configuration: setters for newly added fields

* runtime/configuration: set codec indexes

* runtime/configuration: update test

* primitives: fix SessionInfo definition

* runtime/session_info: initial impl

* runtime/session_info: use initializer for session handling (wip)

* runtime/session_info: mock authority discovery trait

* guide: update the initializer's order

* runtime/session_info: tests skeleton

* runtime/session_info: store n_delay_tranches in Configuration

* runtime/session_info: punt on approval keys

* runtime/session_info: add some basic tests

* Update primitives/src/v1.rs

* small fixes

* remove codec index annotation on structs

* fix off-by-one error

* validator_discovery: accept a session index

* runtime: replace validator_discovery api with session_info

* Update runtime/parachains/src/session_info.rs

Co-authored-by: Sergei Shulepov <sergei@parity.io>

* runtime/session_info: add a comment about missing entries

* runtime/session_info: define the keys

* util: expose connect_to_past_session_validators

* util: allow session_info requests for jobs

* runtime-api: add mock test for session_info

* collator-protocol: add session_index to test state

* util: fix error message for runtime error

* fix compilation

* fix tests after merge with master

Co-authored-by: Sergei Shulepov <sergei@parity.io>
This commit is contained in:
Andronik Ordian
2020-11-26 12:02:50 +01:00
committed by GitHub
parent 4ce744818c
commit 39a12b68f6
25 changed files with 696 additions and 213 deletions
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polkadot/roadmap/implementers-guide/src/runtime/initializer.md
+1 -1
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@@ -23,7 +23,7 @@ The other parachains modules are initialized in this order:
1. Paras
1. Scheduler
1. Inclusion
1. Validity
1. SessionInfo
1. DMP
1. UMP
1. HRMP
polkadot/roadmap/implementers-guide/src/runtime/session_info.md
+3 -4
View File
@@ -30,11 +30,11 @@ struct SessionInfo {
// no-show.
no_show_slots: u32,
/// The number of validators needed to approve a block.
needed_approvals: u32,
needed_approvals: u32,
}
```
Storage Layout:
Storage Layout:
```rust
/// The earliest session for which previous session info is stored.
@@ -45,11 +45,10 @@ Sessions: map SessionIndex => Option<SessionInfo>,
## Session Change
1. Update the `CurrentSessionIndex`.
1. Update `EarliestStoredSession` based on `config.dispute_period` and remove all entries from `Sessions` from the previous value up to the new value.
1. Create a new entry in `Sessions` with information about the current session.
## Routines
* `earliest_stored_session() -> SessionIndex`: Yields the earliest session for which we have information stored.
* `session_info(session: SessionIndex) -> Option<SessionInfo>`: Yields the session info for the given session, if stored.
* `session_info(session: SessionIndex) -> Option<SessionInfo>`: Yields the session info for the given session, if stored.