Registers the attester service to the beacon node RPC client

validator_client/src/attestation_producer/grpc.rs

@@ -0,0 +1,59 @@
+use super::beacon_node_attestation::BeaconNodeAttestation;
+use crate::block_producer::{BeaconNodeError, PublishOutcome};
+use protos::services_grpc::AttestationServiceClient;
+use ssz::{ssz_encode, Decodable};
+
+use protos::services::{
+    Attestation as GrpcAttestation, ProduceAttestationDataRequest, PublishAttestationRequest,
+};
+use types::{Attestation, AttestationData, Slot};
+
+impl BeaconNodeAttestation for AttestationServiceClient {
+    fn produce_attestation_data(
+        &self,
+        slot: Slot,
+        shard: u64,
+    ) -> Result<AttestationData, BeaconNodeError> {
+        let mut req = ProduceAttestationDataRequest::new();
+        req.set_slot(slot.as_u64());
+        req.set_shard(shard);
+
+        let reply = self
+            .produce_attestation_data(&req)
+            .map_err(|err| BeaconNodeError::RemoteFailure(format!("{:?}", err)))?;
+
+        dbg!("Produced Attestation Data");
+
+        let (attestation_data, _index) =
+            AttestationData::ssz_decode(reply.get_attestation_data().get_ssz(), 0)
+                .map_err(|_| BeaconNodeError::DecodeFailure)?;
+        Ok(attestation_data)
+    }
+
+    fn publish_attestation(
+        &self,
+        attestation: Attestation,
+    ) -> Result<PublishOutcome, BeaconNodeError> {
+        let mut req = PublishAttestationRequest::new();
+
+        let ssz = ssz_encode(&attestation);
+
+        let mut grpc_attestation = GrpcAttestation::new();
+        grpc_attestation.set_ssz(ssz);
+
+        req.set_attestation(grpc_attestation);
+
+        let reply = self
+            .publish_attestation(&req)
+            .map_err(|err| BeaconNodeError::RemoteFailure(format!("{:?}", err)))?;
+
+        if reply.get_success() {
+            Ok(PublishOutcome::Valid)
+        } else {
+            // TODO: distinguish between different errors
+            Ok(PublishOutcome::InvalidAttestation(
+                "Publish failed".to_string(),
+            ))
+        }
+    }
+}