Gloas local block building MVP (#8754)

The flow for local block building is
1. Create execution payload and bid
2. Construct beacon block
3. Sign beacon block and publish
4. Sign execution payload and publish

This PR adds the beacon block v4 flow , GET payload envelope and POST payload envelope (local block building only). The spec for these endpoints can be found here:  https://github.com/ethereum/beacon-APIs/pull/552  and is subject to change.

We needed a way to store the unsigned execution payload envelope associated to the execution payload bid that was included in the block. I introduced a new cache that stores these unsigned execution payload envelopes. the GET payload envelope queries this cache directly so that a proposer, after publishing a block, can fetch the payload envelope + sign and publish it.

I kept payload signing and publishing within the validators block service to keep things simple for now. The idea was to build out a block production MVP for devnet 0, try not to affect any non gloas code paths and build things out in such a way that it will be easy to deprecate pre-gloas code paths later on (for example block production v2 and v3).

We will eventually need to track which beacon node was queried for the block so that we can later query it for the payload. But thats not needed for the devnet.


  


Co-Authored-By: Eitan Seri- Levi <eserilev@gmail.com>

Co-Authored-By: Michael Sproul <michael@sigmaprime.io>

Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

Co-Authored-By: Eitan Seri-Levi <eserilev@ucsc.edu>

consensus/state_processing/src/envelope_processing.rs

@@ -20,6 +20,23 @@ macro_rules! envelope_verify {
     };
 }
 
+/// The strategy to be used when validating the payloads state root.
+#[cfg_attr(feature = "arbitrary-fuzz", derive(arbitrary::Arbitrary))]
+#[derive(PartialEq, Clone, Copy)]
+pub enum VerifyStateRoot {
+    /// Validate state root.
+    True,
+    /// Do not validate state root. Use with caution.
+    /// This should only be used when first constructing the payload envelope.
+    False,
+}
+
+impl VerifyStateRoot {
+    pub fn is_true(self) -> bool {
+        self == VerifyStateRoot::True
+    }
+}
+
 #[derive(Debug, Clone)]
 pub enum EnvelopeProcessingError {
     /// Bad Signature
@@ -111,6 +128,7 @@ pub fn process_execution_payload_envelope<E: EthSpec>(
     parent_state_root: Option<Hash256>,
     signed_envelope: &SignedExecutionPayloadEnvelope<E>,
     verify_signatures: VerifySignatures,
+    verify_state_root: VerifyStateRoot,
     spec: &ChainSpec,
 ) -> Result<(), EnvelopeProcessingError> {
     if verify_signatures.is_true() {
@@ -264,15 +282,17 @@ pub fn process_execution_payload_envelope<E: EthSpec>(
         .map_err(EnvelopeProcessingError::BitFieldError)?;
     *state.latest_block_hash_mut()? = payload.block_hash;
 
-    // Verify the state root
-    let state_root = state.canonical_root()?;
-    envelope_verify!(
-        envelope.state_root == state_root,
-        EnvelopeProcessingError::InvalidStateRoot {
-            state: state_root,
-            envelope: envelope.state_root,
-        }
-    );
+    if verify_state_root.is_true() {
+        // Verify the state root
+        let state_root = state.canonical_root()?;
+        envelope_verify!(
+            envelope.state_root == state_root,
+            EnvelopeProcessingError::InvalidStateRoot {
+                state: state_root,
+                envelope: envelope.state_root,
+            }
+        );
+    }
 
     Ok(())
 }