[multinode] Validator set injection through a Realm #1823
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zivkovicmilos
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@zivkovicmilos are you working on it? please call me so we can clarify some details. |
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@moul I'll ping you about this so we can set up a slot |
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## Description This PR introduces an `EndBlocker` system for applying validator set changes protocol level, based on on-chain events (from the `/r/sys/vals` realm). I've utilized an already existing system: - validator set changes still stay managed protocol-level in `ConsensusState` -> refactoring this is not a small feat, and saying this is an understatement - event switch utilized by the node that dumps new block / new transaction events The way this flow essentially works is the following: 1. An on-chain event happens that indicates a change in the validator set (added / removed) 2. These events (ABCI events) are parsed as soon as they end up in a transaction result (are pushed to the event system of the SDK). The top-level ABCI event type needs to be`EventTx` (indicating it's a new TX result). The underlying tx GnoVM events (`GnoEvent`) need to be from the `/r/sys/validators` Realm, and be a validator addition / removal (type defined in the Realm) 4. Events are parsed down into `abci.ValidatorUpdates`, which are returned as a result of `EndBlocker` 5. This `EndBlocker` result is later read by the `ConsensusState`, and the validator set changes are applied for the upcoming block in a series of existing callbacks. This also keeps proposer priority logic in check. Blocked by gnolang#2130 Closes gnolang#1823 ```mermaid --- title: on-chain validator set injection flow --- flowchart TD subgraph app.go nesvw(["Node event switch"]) -. pass all block events .-> collector(["event collector"]) collector -. subscribes to .-> nesvw collector -. filter new events .-> collector EB["func EndBlocker(...)"] == 1: fetch relevant events ==> collector collector -. 2: return events, if any .-> EB end subgraph gno.land/r/sys/validators.gno GC["func GetChanges(from int64) []validators.Validator"] addVal["func addValidator(...)"] removeVal["func removeValidator(...)"] PE["func NewPropExecutor(changesFn) proposal.Executor"] PE -. calls internally .-> addVal PE -. calls internally .-> removeVal addVal -. std emits ValidatorAdded .-> nesvw removeVal -. std emits ValidatorRemoved .-> nesvw end subgraph gno.land/r/gov/dao.gno EP["func ExecuteProposal(...)"] EP == executes on-chain ==>PE end subgraph user_proposal.gno main("func main() {...}") PR["govdao.Propose(...)"] main -. contains .-> CB main -. contains .-> PR CB("changesFn func() []validators.Validator {...}") CB== creates ==>PE CB("changesFn func() []validators.Validator {...}") PE == passed into ==> PR end A[/fa:fa-user User\] == gnokey maketx run ==> main GDV[/fa:fa-people-group GOVDAO members\] == manually call ==> EP EB == 3: execute VM call to get changes since last block ==> GC GC -. 4: return changes .-> EB EB -. 5: return response with valset changes .-> EBR([abci.ResponseEndBlock]) -- applied in --> AB subgraph Cosmos SDK AB["func ApplyBlock(...) {...}"] end ``` Related: gnolang#1945 <details><summary>Contributors' checklist...</summary> - [ ] Added new tests, or not needed, or not feasible - [ ] Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory - [ ] Updated the official documentation or not needed - [ ] No breaking changes were made, or a `BREAKING CHANGE: xxx` message was included in the description - [ ] Added references to related issues and PRs - [ ] Provided any useful hints for running manual tests - [ ] Added new benchmarks to [generated graphs](https://gnoland.github.io/benchmarks), if any. More info [here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md). </details> --------- Co-authored-by: Manfred Touron <[email protected]>
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Description
This effort covers the ability for the TM2 consensus mechanism to use the validator set that is specified in a Realm.
Currently, the validator set is kept in-memory (and on-disk), and changes to it are subject to protocol-level changes for mechanisms like PoS. This effort would tackle enabling the consensus layer to utilize a validator set that is abstracted away inside a Realm.
The benefit of having the validator set inside a Realm is the ability to transparently manage it and govern who can be validating and building blocks.
Successful outcome of this effort:
The text was updated successfully, but these errors were encountered: