Expose GRANDPA round state through RPC #5375

octol · 2020-03-24T10:40:23Z

Implements #4921

Depends on paritytech/finality-grandpa#114

Left to do

JSON RPC error code?
Convert SharedVoterState to struct
Reintroduce the test stub
~~Add to light client~~
Move serialized structs to separate file
Can we use u32 for serialized fields?

polkadot companion: paritytech/polkadot#1040

parity-cla-bot · 2020-03-24T10:40:27Z

It looks like @octol signed our Contributor License Agreement. 👍

Many thanks,

Parity Technologies CLA Bot

bin/node/rpc/src/lib.rs

andresilva · 2020-03-25T12:38:18Z

client/finality-grandpa/src/environment.rs

-	pub(crate) voter_set_state: SharedVoterSetState<Block>,
-	pub(crate) voting_rule: VR,
+pub struct Environment<B, E, Block: BlockT, N: NetworkT<Block>, RA, SC, VR> {
+	pub client: Arc<Client<B, E, Block, RA>>,


Do we need to make the fields public? We only care about exporting the Environment type. If the fields are not public I assume that a lot less types would have to be exported.

Yeah I have some hope to be able to roll back some of these pub changes once it's all up and working

octol · 2020-03-25T21:21:50Z

bin/node/cli/src/service.rs

@@ -54,6 +55,8 @@ macro_rules! new_full_start {
 		type RpcExtension = jsonrpc_core::IoHandler<sc_rpc::Metadata>;
 		let mut import_setup = None;
 		let inherent_data_providers = sp_inherents::InherentDataProviders::new();
+		// WIP: sort out construction
+		let shared_voter_state = Arc::new(RwLock::new(None));


This part here, how to construct when we don't yet have Environment available. Any ideas on the best approach @seunlanlege ?

I have no idea what VoterState is.

tried checking out this PR, but it looks like you're using a custom finality-grandpa crate. Try using a git dependency.

Yeah that's right, it depends on paritytech/finality-grandpa#114

Updated to use git dependency pointing to my fork on github

This object will always be constructed by the Voter in finality-grandpa. You just keep it uninitialized here.

andresilva

I didn't expect the VoterSet changes to cause so much disruption here and I think they should be handled properly before we migrate to grandpa 0.12. So in order to not block this PR on that let's target grandpa 0.11 here. I can help with rebasing this if you need.
Most of your WIP comments that aren't related to 0.12 changes seem sensible to me and should be done 👍

andresilva · 2020-04-20T16:31:46Z

bin/node/cli/src/service.rs

+		let shared_voter_state: grandpa::SharedVoterState<grandpa::AuthorityId>
+			= Arc::new(parking_lot::RwLock::new(None));


Suggested change

let shared_voter_state: grandpa::SharedVoterState<grandpa::AuthorityId>

= Arc::new(parking_lot::RwLock::new(None));

let shared_voter_state: grandpa::SharedVoterState<grandpa::AuthorityId> =

Arc::new(parking_lot::RwLock::new(None));

Is the type still needed?

Nope not anymore!

andresilva · 2020-04-20T16:38:33Z

client/finality-grandpa/rpc/src/lib.rs

+        jsonrpc_core::Error {
+            message: format!("{}", error).into(),
+            // WIP: what error code should we use?
+            code: jsonrpc_core::ErrorCode::ServerError(1234),


1? Put it in a const named NOT_READY?

andresilva · 2020-04-20T16:45:43Z

client/finality-grandpa/src/authorities.rs

-		self.inner.read().current_authorities.iter().cloned().collect()
+	pub fn current_authorities(&self) -> VoterSet<AuthorityId> {
+		// WIP: unwrap
+		VoterSet::new(self.inner.read().current_authorities.iter().cloned()).unwrap()


For now let's add an expect here with a message saying that authorities should not be 0. Let's deal with this in a follow-up PR.

andresilva · 2020-04-20T16:48:43Z

client/finality-grandpa/src/lib.rs

@@ -620,6 +632,9 @@ pub struct GrandpaParams<Block: BlockT, C, N, SC, VR> {
 	pub voting_rule: VR,
 	/// The prometheus metrics registry.
 	pub prometheus_registry: Option<prometheus_endpoint::Registry>,
+	/// The voter state is exposed at an RPC endpoint.
+	// WIP: should we use Environment::Id istead of AuthorityId?
+	pub shared_voter_state: SharedVoterState<AuthorityId>,


This isn't typed by Environment, it's okay to keep the id fixed.

andresilva · 2020-04-20T16:50:09Z

client/finality-grandpa/src/lib.rs

@@ -203,6 +206,9 @@ type CommunicationOutH<Block, H> = finality_grandpa::voter::CommunicationOut<
 	AuthorityId,
 >;

+// WIP: convert to struct
+pub type SharedVoterState<Id> = Arc<RwLock<Option<Box<dyn voter::VoterState<Id> + Sync + Send>>>>;


This shouldn't be typed by Id and instead should fix the VoterState to AuthorityId.

client/finality-grandpa/rpc/src/lib.rs

andresilva

just some minor nits but overall lgtm! :)

andresilva · 2020-04-24T11:33:04Z

bin/node/cli/src/service.rs

@@ -100,12 +104,16 @@ macro_rules! new_full_start {
 						keystore: builder.keystore(),
 						babe_config: sc_consensus_babe::BabeLink::config(babe_link).clone(),
 						shared_epoch_changes: sc_consensus_babe::BabeLink::epoch_changes(babe_link).clone()
+					},
+					grandpa: node_rpc::GrandpaDeps {
+						shared_voter_state: Arc::clone(&shared_voter_state),


Suggested change

shared_voter_state: Arc::clone(&shared_voter_state),

shared_voter_state: shared_voter_state.clone(),

Interesting, hadn't spotted that it wasn't the recommended style anymore

andresilva · 2020-04-24T11:37:22Z

bin/node/cli/src/service.rs

 					}
 				};
 				Ok(node_rpc::create_full(deps))
 			})?;

-		(builder, import_setup, inherent_data_providers)
+		(builder, import_setup, inherent_data_providers, shared_voter_state)


Do you mind instead creating an let rpc_setup = Some((shared_voter_state)); and returning that instead? Similar to what we do for the import_setup. It's futile right now as we only return one thing from the RPC setup but will make it easier if we need to add anything else in the future.

client/finality-grandpa/rpc/src/lib.rs

andresilva · 2020-04-24T11:43:27Z

client/finality-grandpa/src/lib.rs

@@ -203,6 +206,9 @@ type CommunicationOutH<Block, H> = finality_grandpa::voter::CommunicationOut<
 	AuthorityId,
 >;

+// WIP: convert to struct
+pub type SharedVoterState = Arc<RwLock<Option<Box<dyn voter::VoterState<AuthorityId> + Sync + Send>>>>;


Yeah would be nice mainly to avoid exposing the lock, i.e. it would only expose a getter method to get the data we need. Not a blocker though.

andresilva · 2020-04-24T11:45:04Z

client/finality-grandpa/rpc/src/lib.rs

+        let future = async move { round_states }.boxed();
+        Box::new(future.map_err(jsonrpc_core::Error::from).compat())
+    }
+}


Initially you had a test stub here and I think it was nice test to have.

I second that.

andresilva · 2020-04-24T11:50:16Z

client/finality-grandpa/src/lib.rs

@@ -858,6 +877,10 @@ where
 					last_finalized,
 				);

+				// Repoint shared_voter_state so that the RPC endpoint can query the state
+				let mut shared_voter_state = self.shared_voter_state.write();


Just to be safe, could you replace this .write() with .try_write_for(Duration::from_secs(1))? Just to be safe, in case there's a deadlock we won't block the voter.

Yes that makes sense!

andresilva · 2020-05-01T01:44:59Z

Fixed a bunch of nits, made the RPC handler testable and wrote tests. This currently depends on paritytech/finality-grandpa#118 being merged and v0.12.1 published. @tomusdrw do you mind giving this another look?

octol · 2020-05-01T09:51:33Z

client/finality-grandpa/rpc/src/report.rs

+
+		let voter_state = voter_state.get().ok_or(Error::EndpointNotReady)?;
+
+		let (set_id, current_voters) = authority_set.get();


~~The first set_id is shadowed and unused?~~

EDIT: my bad, it's not!

gavofyork · 2020-05-01T12:18:15Z

doesn't build?

octol · 2020-05-01T12:38:02Z

doesn't build?

Waiting for a new release of finality-grandpa containing this: paritytech/finality-grandpa#118

andresilva · 2020-05-01T14:03:54Z

Should build and pass tests now (if it doesn't then I did something wrong :)

tomusdrw · 2020-05-04T08:30:24Z

This one looks good, but polkadot companion PR seems to have build failures.

andresilva · 2020-05-04T10:34:24Z

@tomusdrw Not sure if there were any previous errors and/or you restarted the build, polkadot companion is green here atm. The PR on polkadot itself will be green once this is merged and substrate is updated.

gnunicorn · 2020-05-04T12:08:55Z

Updated the companion PR, @andresilva could you take another look here and there? (companion fails because I already updated the companion PR, but the reference is missing. However, it had passed prior.)

* Companion PR for Substrate paritytech#5375 * fix compilation * Update rpc/Cargo.toml * update substrate Co-authored-by: André Silva <andre.beat@gmail.com> Co-authored-by: Benjamin Kampmann <ben@gnunicorn.org>

octol added the A3-in_progress Pull request is in progress. No review needed at this stage. label Mar 24, 2020

paritytech-ci added the B2-breaksapi label Mar 24, 2020

seunlanlege reviewed Mar 25, 2020

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octol force-pushed the jon/issue-4921-expose-grandpa-round-state-try-shared-arc branch from 2426a3d to 58f52da Compare March 25, 2020 11:08

andresilva reviewed Mar 25, 2020

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octol commented Mar 25, 2020

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octol force-pushed the jon/issue-4921-expose-grandpa-round-state-try-shared-arc branch 2 times, most recently from 572ce7c to cdd55fe Compare April 7, 2020 11:03

octol force-pushed the jon/issue-4921-expose-grandpa-round-state-try-shared-arc branch from db2a02d to 83c82c9 Compare April 15, 2020 20:06

octol mentioned this pull request Apr 17, 2020

Expose voter state paritytech/finality-grandpa#114

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andresilva reviewed Apr 20, 2020

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HCastano mentioned this pull request Apr 22, 2020

Add Subscription RPC for Grandpa Finality #5732

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octol force-pushed the jon/issue-4921-expose-grandpa-round-state-try-shared-arc branch from 6464139 to c6486d6 Compare April 23, 2020 21:07

octol commented Apr 23, 2020

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client/finality-grandpa/rpc/src/lib.rs Outdated Show resolved Hide resolved

andresilva reviewed Apr 24, 2020

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octol and others added 13 commits April 27, 2020 11:34

grandpa: wire up basic RPC call

5f6bb70

grandpa: make it compile against GRANDPA with expose round state

4ef39fa

grandpa: use shared voter state to expose RPC endpoint

eea294d

grandpa: restructure into nested structs

a8109a2

grandpa: return background rounds too

04fca7e

grandpa: return error when endpoint not ready

627c7a8

grandpa: collect grandpa rpc deps

123e249

grandpa: decide to use concrete AuthorityId in finality-grandpa-rpc

10b3266

grandpa: remove unncessary type annotation

eb5d87d

grandpa: move error code to const

6edfa13

grandpa: remove unnecessary WIP comment

bcb206d

grandpa: remove Id type parameter for SharedVoterState

4ca212d

grandpa: update tests to add shared_voter_state in parameters

b2af4f7

andresilva added 4 commits May 1, 2020 01:03

grandpa: remove test_utils

7aed9bb

grandpa: allow mocking rpc handler components

65f8674

grandpa: rename serialized to report in rpc module

a3e477d

grandpa: add proper test for RPC

23536a0

octol commented May 1, 2020

View reviewed changes

grandpa: update to finality-grandpa v0.12.1

aabacb8

tomusdrw approved these changes May 4, 2020

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tomusdrw added A8-mergeoncegreen and removed A6-mustntgrumble labels May 4, 2020

gnunicorn added A8-mergeoncegreen and removed A7-needspolkadotpr labels May 4, 2020

gnunicorn requested a review from andresilva May 4, 2020 12:08

gnunicorn added A0-please_review Pull request needs code review. and removed A8-mergeoncegreen labels May 4, 2020

andresilva approved these changes May 4, 2020

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andresilva merged commit c0ccc24 into paritytech:master May 4, 2020

andresilva mentioned this pull request May 4, 2020

Expose GRANDPA round state through RPC #4921

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Expose GRANDPA round state through RPC #5375

Expose GRANDPA round state through RPC #5375

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		let shared_voter_state: grandpa::SharedVoterState<grandpa::AuthorityId>
		= Arc::new(parking_lot::RwLock::new(None));

	shared_voter_state: Arc::clone(&shared_voter_state),
	shared_voter_state: shared_voter_state.clone(),


		let voter_state = voter_state.get().ok_or(Error::EndpointNotReady)?;

		let (set_id, current_voters) = authority_set.get();

Expose GRANDPA round state through RPC #5375

Expose GRANDPA round state through RPC #5375

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