Async keystore + Authority-Discovery async/await (#7000)

* Asyncify sign_with

* Asyncify generate/get keys

* Complete BareCryptoStore asyncification

* Cleanup

* Rebase

* Add Proxy

* Inject keystore proxy into extensions

* Implement some methods

* Await on send

* Cleanup

* Send result over the oneshot channel sender

* Process one future at a time

* Fix cargo stuff

* Asyncify sr25519_vrf_sign

* Cherry-pick and fix changes

* Introduce SyncCryptoStore

* SQUASH ME WITH THE first commit

* Implement into SyncCryptoStore

* Implement BareCryptoStore for KeystoreProxyAdapter

* authority-discovery

* AURA

* BABE

* finality-grandpa

* offchain-workers

* benchmarking-cli

* sp_io

* test-utils

* application-crypto

* Extensions and RPC

* Client Service

* bin

* Update cargo.lock

* Implement BareCryptoStore on proxy directly

* Simplify proxy setup

* Fix authority-discover

* Pass async keystore to authority-discovery

* Fix tests

* Use async keystore in authority-discovery

* Rename BareCryptoStore to CryptoStore

* WIP

* Remote mutable borrow in CryptoStore trait

* Implement Keystore with backends

* Remove Proxy implementation

* Fix service builder and keystore user-crates

* Fix tests

* Rework authority-discovery after refactoring

* futures::select!

* Fix multiple mut borrows in authority-discovery

* Merge fixes

* Require sync

* Restore Cargo.lock

* PR feedback - round 1

* Remove Keystore and use LocalKeystore directly

Also renamed KeystoreParams to KeystoreContainer

* Join

* Remove sync requirement

* Fix keystore tests

* Fix tests

* client/authority-discovery: Remove event stream dynamic dispatching

With authority-discovery moving from a poll based future to an `async`
future Rust has difficulties propagating the `Sync` trade through the
generated state machine.

Instead of using dynamic dispatching, use a trait parameter to specify
the DHT event stream.

* Make it compile

* Fix submit_transaction

* Fix block_on issue

* Use await in async context

* Fix manual seal keystore

* Fix authoring_blocks test

* fix aura authoring_blocks

* Try to fix tests for auth-discovery

* client/authority-discovery: Fix lookup_throttling test

* client/authority-discovery: Fix triggers_dht_get_query test

* Fix epoch_authorship_works

* client/authority-discovery: Remove timing assumption in unit test

* client/authority-discovery: Revert changes to termination test

* PR feedback

* Remove deadcode and mark test code

* Fix test_sync

* Use the correct keyring type

* Return when from_service stream is closed

* Convert SyncCryptoStore to a trait

* Fix line width

* Fix line width - take 2

* Remove unused import

* Fix keystore instantiation

* PR feedback

* Remove KeystoreContainer

* Revert "Remove KeystoreContainer"

This reverts commit ea4a37c7d74f9772b93d974e05e4498af6192730.

* Take a ref of keystore

* Move keystore to dev-dependencies

* Address some PR feedback

* Missed one

* Pass keystore reference - take 2

* client/finality-grandpa: Use `Arc<dyn CryptoStore>` instead of SyncXXX

Instead of using `SyncCryptoStorePtr` within `client/finality-grandpa`,
which is a type alias for `Arc<dyn SyncCryptoStore>`, use `Arc<dyn
CryptoStore>`. Benefits are:

1. No additional mental overhead of a `SyncCryptoStorePtr`.

2. Ability for new code to use the asynchronous methods of `CryptoStore`
instead of the synchronous `SyncCryptoStore` methods within
`client/finality-granpa` without the need for larger refactorings.

Note: This commit uses `Arc<dyn CryptoStore>` instead of
`CryptoStorePtr`, as I find the type signature more descriptive. This is
subjective and in no way required.

* Remove SyncCryptoStorePtr

* Remove KeystoreContainer & SyncCryptoStorePtr

* PR feedback

* *: Use CryptoStorePtr whereever possible

* *: Define SyncCryptoStore as a pure extension trait of CryptoStore

* Follow up to SyncCryptoStore extension trait

* Adjust docs for SyncCryptoStore as Ben suggested

* Cleanup unnecessary requirements

* sp-keystore

* Use async_std::task::block_on in keystore

* Fix block_on std requirement

* Update primitives/keystore/src/lib.rs

Co-authored-by: Max Inden <mail@max-inden.de>

* Fix wasm build

* Remove unused var

* Fix wasm compilation - take 2

* Revert async-std in keystore

* Fix indent

* Fix version and copyright

* Cleanup feature = "std"

* Auth Discovery: Ignore if from_service is cloed

* Max's suggestion

* Revert async-std usage for block_on

* Address PR feedback

* Fix example offchain worker build

* Address PR feedback

* Update Cargo.lock

* Move unused methods to test helper functions

* Restore accidentally deleted cargo.lock files

* Fix unused imports

Co-authored-by: Max Inden <mail@max-inden.de>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/client/finality-grandpa/src/communication/mod.rs

@@ -35,7 +35,7 @@ use parking_lot::Mutex;
 use prometheus_endpoint::Registry;
 use std::{pin::Pin, sync::Arc, task::{Context, Poll}};
 
-use sp_core::traits::BareCryptoStorePtr;
+use sp_keystore::SyncCryptoStorePtr;
 use finality_grandpa::Message::{Prevote, Precommit, PrimaryPropose};
 use finality_grandpa::{voter, voter_set::VoterSet};
 use sc_network::{NetworkService, ReputationChange};
@@ -107,7 +107,7 @@ mod benefit {
 
 /// A type that ties together our local authority id and a keystore where it is
 /// available for signing.
-pub struct LocalIdKeystore((AuthorityId, BareCryptoStorePtr));
+pub struct LocalIdKeystore((AuthorityId, SyncCryptoStorePtr));
 
 impl LocalIdKeystore {
 	/// Returns a reference to our local authority id.
@@ -116,19 +116,13 @@ impl LocalIdKeystore {
 	}
 
 	/// Returns a reference to the keystore.
-	fn keystore(&self) -> &BareCryptoStorePtr {
-		&(self.0).1
+	fn keystore(&self) -> SyncCryptoStorePtr{
+		(self.0).1.clone()
 	}
 }
 
-impl AsRef<BareCryptoStorePtr> for LocalIdKeystore {
-	fn as_ref(&self) -> &BareCryptoStorePtr {
-		self.keystore()
-	}
-}
-
-impl From<(AuthorityId, BareCryptoStorePtr)> for LocalIdKeystore {
-	fn from(inner: (AuthorityId, BareCryptoStorePtr)) -> LocalIdKeystore {
+impl From<(AuthorityId, SyncCryptoStorePtr)> for LocalIdKeystore {
+	fn from(inner: (AuthorityId, SyncCryptoStorePtr)) -> LocalIdKeystore {
 		LocalIdKeystore(inner)
 	}
 }
@@ -696,7 +690,7 @@ impl<Block: BlockT> Sink<Message<Block>> for OutgoingMessages<Block>
 		if let Some(ref keystore) = self.keystore {
 			let target_hash = *(msg.target().0);
 			let signed = sp_finality_grandpa::sign_message(
-				keystore.as_ref(),
+				keystore.keystore(),
 				msg,
 				keystore.local_id().clone(),
 				self.round,