Prepare proposer (#3043)

## Issue Addressed Resolves #2936 ## Proposed Changes Adds functionality for calling [`validator/prepare_beacon_proposer`](https://ethereum.github.io/beacon-APIs/?urls.primaryName=dev#/Validator/prepareBeaconProposer) in advance. There is a `BeaconChain::prepare_beacon_proposer` method which, which called, computes the proposer for the next slot. If that proposer has been registered via the `validator/prepare_beacon_proposer` API method, then the `beacon_chain.execution_layer` will be provided the `PayloadAttributes` for us in all future forkchoiceUpdated calls. An artificial forkchoiceUpdated call will be created 4s before each slot, when the head updates and when a validator updates their information. Additionally, I added strict ordering for calls from the `BeaconChain` to the `ExecutionLayer`. I'm not certain the `ExecutionLayer` will always maintain this ordering, but it's a good start to have consistency from the `BeaconChain`. There are some deadlock opportunities introduced, they are documented in the code. ## Additional Info - ~~Blocked on #2837~~ Co-authored-by: realbigsean <[email protected]>
sigp · Mar 9, 2022 · 267d8ba · 267d8ba
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/beacon_node/beacon_chain/Cargo.toml b/beacon_node/beacon_chain/Cargo.toml
@@ -14,6 +14,7 @@ fork_from_env = [] # Initialise the harness chain spec from the FORK_NAME env va
 [dev-dependencies]
 maplit = "1.0.2"
 environment = { path = "../../lighthouse/environment" }
+serde_json = "1.0.58"
 
 [dependencies]
 merkle_proof = { path = "../../consensus/merkle_proof" }