fix: setting execution head from rpc always retries

cl/blockbuilder/blockbuilder.go

@@ -120,18 +120,7 @@ func (bb *BlockBuilder) GetPayload(ctx context.Context) error {
 
 	if bb.executionHead == nil {
 		bb.logger.Info("executionHead is nil, it'll be set by RPC. CL is likely being restarted")
-		err = util.RetryWithBackoff(ctx, maxAttempts, bb.logger, func() error {
-			innerErr := bb.SetExecutionHeadFromRPC(ctx)
-			if innerErr != nil {
-				bb.logger.Warn(
-					"Failed to set execution head from rpc, retrying...",
-					"error", innerErr,
-				)
-				return innerErr // Will retry
-			}
-			return nil // Success
-		})
-		if err != nil {
+		if err := bb.SetExecutionHeadFromRPC(ctx); err != nil {
 			return fmt.Errorf("failed to set execution head from rpc: %w", err)
 		}
 	}
@@ -494,16 +483,19 @@ func (bb *BlockBuilder) updateForkChoice(ctx context.Context, fcs engine.Forkcho
 }
 
 func (bb *BlockBuilder) SetExecutionHeadFromRPC(ctx context.Context) error {
-	header, err := bb.engineCl.HeaderByNumber(ctx, nil) // nil for the latest block
-	if err != nil {
-		return fmt.Errorf("failed to get the latest block header: %w", err)
-	}
-	bb.executionHead = &types.ExecutionHead{
-		BlockHeight: header.Number.Uint64(),
-		BlockHash:   header.Hash().Bytes(),
-		BlockTime:   header.Time,
-	}
-	return nil
+	return util.RetryWithBackoff(ctx, maxAttempts, bb.logger, func() error {
+		header, err := bb.engineCl.HeaderByNumber(ctx, nil) // nil for the latest block
+		if err != nil {
+			bb.logger.Warn("Failed to get the latest block header via RPC, retrying...", "error", err)
+			return err // Will retry
+		}
+		bb.executionHead = &types.ExecutionHead{
+			BlockHeight: header.Number.Uint64(),
+			BlockHash:   header.Hash().Bytes(),
+			BlockTime:   header.Time,
+		}
+		return nil // Success
+	})
 }
 
 func (bb *BlockBuilder) GetExecutionHead() *types.ExecutionHead {

infrastructure/docker/Dockerfile.builder

@@ -38,7 +38,8 @@ ARG TARGETS="./oracle/cmd \
              ./tools/relay-emulator \
              ./tools/validators-monitor \
              ./tools/points-service \
-             ./p2p/integrationtest/provider"
+             ./p2p/integrationtest/provider \
+             ./cl/cmd/singlenode"
 
 RUN --mount=type=cache,target=/root/.cache/go-build \
     --mount=type=cache,target=/go/pkg/mod \
@@ -51,6 +52,10 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
         else \
             name=$bn; \
         fi; \
+        # Special case for singlenode
+        if [ "$path" = "./cl/cmd/singlenode" ]; then \
+            name="snode"; \
+        fi; \
         echo "→ building $path as /go/bin/$name"; \
         CGO_ENABLED=0 go build -o "/go/bin/$name" "$path"; \
     done

infrastructure/docker/Dockerfile.snode

@@ -0,0 +1,8 @@
+# syntax=docker/dockerfile:1.4
+FROM alpine:3.10
+
+COPY --from=builder_ctx /go/bin/snode /usr/local/bin/snode
+
+EXPOSE 8080 9090
+
+ENTRYPOINT ["snode"]

infrastructure/docker/docker-bake.hcl

@@ -129,6 +129,17 @@ target "relay-emulator" {
   labels = get_labels("relay-emulator")
 }
 
+target "snode" {
+  inherits   = ["_common"]
+  context    = "./"
+  dockerfile = "Dockerfile.snode"
+  contexts = {
+    builder_ctx = "target:mev-commit-builder"
+  }
+  tags   = [REPO_NAME != "" ? "${REGISTRY}/${REPO_NAME}:${TAG}-snode" : "${REGISTRY}/snode:${TAG}"]
+  labels = get_labels("snode")
+}
+
 group "all" {
   targets = [
     "mev-commit-builder",
@@ -139,7 +150,8 @@ group "all" {
     "preconf-rpc",
     "bidder-emulator",
     "provider-emulator",
-    "relay-emulator"
+    "relay-emulator",
+    "snode"
   ]
 }