Redb slasher backend impl (#4529)

* initial redb impl

* redb impl

* remove phantom data

* fixed table definition

* fighting the borrow checker

* a rough draft that doesnt cause lifetime issues

* refactoring

* refactor

* refactor

* passing unit tests

* refactor

* refactor

* refactor

* commit

* move everything to one database

* remove panics, ready for a review

* merge

* a working redb impl

* passing a ref of txn to cursor

* this tries to create a second write transaction when initializing cursor. breaks everything

* Use 2 lifetimes and subtyping

Also fixes a bug in last_key caused by rev and next_back cancelling out

* Move table into cursor

* Merge remote-tracking branch 'origin/unstable' into redb-slasher-backend-impl

* changes based on feedback

* update lmdb

* fix lifetime issues

* moving everything from Cursor to Transaction

* update

* upgrade to redb 2.0

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into redb-slasher-backend-impl

* bring back cursor

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into redb-slasher-backend-impl

* fix delete while

* linting

* linting

* switch to lmdb

* update redb to v2.1

* build fixes, remove unwrap or default

* another build error

* hopefully this is the last build error

* fmt

* cargo.toml

* fix mdbx

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into redb-slasher-backend-impl

* Remove a collect

* Merge remote-tracking branch 'origin/unstable' into redb-slasher-backend-impl

* Merge branch 'redb-slasher-backend-impl' of https://github.com/eserilev/lighthouse into redb-slasher-backend-impl

* re-enable test

* fix failing slasher test

* Merge remote-tracking branch 'origin/unstable' into redb-slasher-backend-impl

* Rename DB file to `slasher.redb`

slasher/src/error.rs

@@ -8,6 +8,8 @@ pub enum Error {
     DatabaseMdbxError(mdbx::Error),
     #[cfg(feature = "lmdb")]
     DatabaseLmdbError(lmdb::Error),
+    #[cfg(feature = "redb")]
+    DatabaseRedbError(redb::Error),
     SlasherDatabaseBackendDisabled,
     MismatchedDatabaseVariant,
     DatabaseIOError(io::Error),
@@ -67,6 +69,7 @@ pub enum Error {
     MissingIndexedAttestationId,
     MissingIndexedAttestationIdKey,
     InconsistentAttestationDataRoot,
+    MissingKey,
 }
 
 #[cfg(feature = "mdbx")]
@@ -89,6 +92,41 @@ impl From<lmdb::Error> for Error {
     }
 }
 
+#[cfg(feature = "redb")]
+impl From<redb::TableError> for Error {
+    fn from(e: redb::TableError) -> Self {
+        Error::DatabaseRedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::TransactionError> for Error {
+    fn from(e: redb::TransactionError) -> Self {
+        Error::DatabaseRedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::DatabaseError> for Error {
+    fn from(e: redb::DatabaseError) -> Self {
+        Error::DatabaseRedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::StorageError> for Error {
+    fn from(e: redb::StorageError) -> Self {
+        Error::DatabaseRedbError(e.into())
+    }
+}
+
+#[cfg(feature = "redb")]
+impl From<redb::CommitError> for Error {
+    fn from(e: redb::CommitError) -> Self {
+        Error::DatabaseRedbError(e.into())
+    }
+}
+
 impl From<io::Error> for Error {
     fn from(e: io::Error) -> Self {
         Error::DatabaseIOError(e)