sane values for consensus_max_block_lag

proxyd/proxyd/consensus_poller.go

@@ -220,7 +220,7 @@ func NewConsensusPoller(bg *BackendGroup, opts ...ConsensusOpt) *ConsensusPoller
 
 		banPeriod:          5 * time.Minute,
 		maxUpdateThreshold: 30 * time.Second,
-		maxBlockLag:        50,
+		maxBlockLag:        8, // quarter of an epoch, 8*12 seconds = 96 seconds ~ 1.6 minutes
 		minPeerCount:       3,
 	}
 

proxyd/proxyd/example.config.toml

@@ -93,8 +93,8 @@ backends = ["infura"]
 # consensus_ban_period = "1m"
 # Maximum delay for update the backend, default 30s
 # consensus_max_update_threshold = "20s"
-# Maximum block lag, default 50
-# consensus_max_block_lag = 10
+# Maximum block lag, default 8
+# consensus_max_block_lag = 16
 # Minimum peer count, default 3
 # consensus_min_peer_count = 4
 

proxyd/proxyd/integration_tests/consensus_test.go

@@ -175,12 +175,12 @@ func TestConsensus(t *testing.T) {
 
 	t.Run("prevent using a backend lagging behind", func(t *testing.T) {
 		reset()
-		// node2 is 51 blocks ahead of node1 (0x101 + 51 = 0x134)
-		overrideBlock("node2", "latest", "0x134")
+		// node2 is 8+1 blocks ahead of node1 (0x101 + 8+1 = 0x10a)
+		overrideBlock("node2", "latest", "0x10a")
 		update()
 
-		// since we ignored node1, the consensus should be at 0x133
-		require.Equal(t, "0x134", bg.Consensus.GetLatestBlockNumber().String())
+		// since we ignored node1, the consensus should be at 0x10a
+		require.Equal(t, "0x10a", bg.Consensus.GetLatestBlockNumber().String())
 		require.Equal(t, "0xe1", bg.Consensus.GetSafeBlockNumber().String())
 		require.Equal(t, "0xc1", bg.Consensus.GetFinalizedBlockNumber().String())
 
@@ -192,8 +192,8 @@ func TestConsensus(t *testing.T) {
 
 	t.Run("prevent using a backend lagging behind - one before limit", func(t *testing.T) {
 		reset()
-		// node2 is 50 blocks ahead of node1 (0x101 + 50 = 0x133)
-		overrideBlock("node2", "latest", "0x133")
+		// node2 is 8 blocks ahead of node1 (0x101 + 8 = 0x109)
+		overrideBlock("node2", "latest", "0x109")
 		update()
 
 		// both nodes are in consensus with the lowest block

proxyd/proxyd/integration_tests/testdata/consensus.toml

@@ -18,7 +18,7 @@ consensus_aware = true
 consensus_handler = "noop" # allow more control over the consensus poller for tests
 consensus_ban_period = "1m"
 consensus_max_update_threshold = "2m"
-consensus_max_block_lag = 50
+consensus_max_block_lag = 8
 consensus_min_peer_count = 4
 
 [rpc_method_mappings]

proxyd/proxyd/integration_tests/testdata/consensus_responses.yml

@@ -63,6 +63,17 @@
         "number": "0x103"
       }
     }
+- method: eth_getBlockByNumber
+  block: 0x10a
+  response: >
+    {
+      "jsonrpc": "2.0",
+      "id": 67,
+      "result": {
+        "hash": "hash_0x10a",
+        "number": "0x10a"
+      }
+    }
 - method: eth_getBlockByNumber
   block: 0x132
   response: >