Modularize beacon node backend (#4718)

#4669


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

beacon_node/store/src/errors.rs

@@ -2,6 +2,8 @@ use crate::chunked_vector::ChunkError;
 use crate::config::StoreConfigError;
 use crate::hot_cold_store::HotColdDBError;
 use crate::{hdiff, DBColumn};
+#[cfg(feature = "leveldb")]
+use leveldb::error::Error as LevelDBError;
 use ssz::DecodeError;
 use state_processing::BlockReplayError;
 use types::{milhouse, BeaconStateError, EpochCacheError, Hash256, InconsistentFork, Slot};
@@ -48,6 +50,16 @@ pub enum Error {
     MissingGenesisState,
     MissingSnapshot(Slot),
     BlockReplayError(BlockReplayError),
+    AddPayloadLogicError,
+    InvalidKey,
+    InvalidBytes,
+    InconsistentFork(InconsistentFork),
+    #[cfg(feature = "leveldb")]
+    LevelDbError(LevelDBError),
+    #[cfg(feature = "redb")]
+    RedbError(redb::Error),
+    CacheBuildError(EpochCacheError),
+    RandaoMixOutOfBounds,
     MilhouseError(milhouse::Error),
     Compression(std::io::Error),
     FinalizedStateDecreasingSlot,
@@ -56,17 +68,11 @@ pub enum Error {
         state_root: Hash256,
         slot: Slot,
     },
-    AddPayloadLogicError,
-    InvalidKey,
-    InvalidBytes,
-    InconsistentFork(InconsistentFork),
     Hdiff(hdiff::Error),
-    CacheBuildError(EpochCacheError),
     ForwardsIterInvalidColumn(DBColumn),
     ForwardsIterGap(DBColumn, Slot, Slot),
     StateShouldNotBeRequired(Slot),
     MissingBlock(Hash256),
-    RandaoMixOutOfBounds,
     GenesisStateUnknown,
     ArithError(safe_arith::ArithError),
 }
@@ -145,6 +151,62 @@ impl From<InconsistentFork> for Error {
     }
 }
 
+#[cfg(feature = "leveldb")]
+impl From<LevelDBError> for Error {
+    fn from(e: LevelDBError) -> Error {
+        Error::LevelDbError(e)
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::Error> for Error {
+    fn from(e: redb::Error) -> Self {
+        Error::RedbError(e)
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::TableError> for Error {
+    fn from(e: redb::TableError) -> Self {
+        Error::RedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::TransactionError> for Error {
+    fn from(e: redb::TransactionError) -> Self {
+        Error::RedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::DatabaseError> for Error {
+    fn from(e: redb::DatabaseError) -> Self {
+        Error::RedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::StorageError> for Error {
+    fn from(e: redb::StorageError) -> Self {
+        Error::RedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::CommitError> for Error {
+    fn from(e: redb::CommitError) -> Self {
+        Error::RedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::CompactionError> for Error {
+    fn from(e: redb::CompactionError) -> Self {
+        Error::RedbError(e.into())
+    }
+}
+
 impl From<EpochCacheError> for Error {
     fn from(e: EpochCacheError) -> Error {
         Error::CacheBuildError(e)