Modularize beacon node backend (#4718)

#4669


  Modularize the beacon node backend to make it easier to add new database implementations

lighthouse/Cargo.toml

@@ -7,7 +7,7 @@ autotests = false
 rust-version = "1.80.0"
 
 [features]
-default = ["slasher-lmdb"]
+default = ["slasher-lmdb", "beacon-node-leveldb"]
 # Writes debugging .ssz files to /tmp during block processing.
 write_ssz_files = ["beacon_node/write_ssz_files"]
 # Compiles the BLS crypto code so that the binary is portable across machines.
@@ -24,6 +24,11 @@ slasher-mdbx = ["slasher/mdbx"]
 slasher-lmdb = ["slasher/lmdb"]
 # Support slasher redb backend.
 slasher-redb = ["slasher/redb"]
+# Supports beacon node leveldb backend.
+beacon-node-leveldb = ["store/leveldb"]
+# Supports beacon node redb backend.
+beacon-node-redb = ["store/redb"]
+
 # Deprecated. This is now enabled by default on non windows targets.
 jemalloc = []
 
@@ -56,6 +61,7 @@ serde_json = { workspace = true }
 serde_yaml = { workspace = true }
 slasher = { workspace = true }
 slog = { workspace = true }
+store = { workspace = true }
 task_executor = { workspace = true }
 types = { workspace = true }
 unused_port = { workspace = true }

lighthouse/tests/beacon_node.rs

@@ -1,11 +1,12 @@
-use beacon_node::ClientConfig as Config;
-
 use crate::exec::{CommandLineTestExec, CompletedTest};
 use beacon_node::beacon_chain::chain_config::{
     DisallowedReOrgOffsets, DEFAULT_RE_ORG_CUTOFF_DENOMINATOR, DEFAULT_RE_ORG_HEAD_THRESHOLD,
     DEFAULT_RE_ORG_MAX_EPOCHS_SINCE_FINALIZATION,
 };
-use beacon_node::beacon_chain::graffiti_calculator::GraffitiOrigin;
+use beacon_node::{
+    beacon_chain::graffiti_calculator::GraffitiOrigin,
+    beacon_chain::store::config::DatabaseBackend as BeaconNodeBackend, ClientConfig as Config,
+};
 use beacon_processor::BeaconProcessorConfig;
 use eth1::Eth1Endpoint;
 use lighthouse_network::PeerId;
@@ -2691,3 +2692,13 @@ fn genesis_state_url_value() {
             assert_eq!(config.genesis_state_url_timeout, Duration::from_secs(42));
         });
 }
+
+#[test]
+fn beacon_node_backend_override() {
+    CommandLineTest::new()
+        .flag("beacon-node-backend", Some("leveldb"))
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert_eq!(config.store.backend, BeaconNodeBackend::LevelDb);
+        });
+}