Replace the gob-encoded `rawdb.{Read,Write}VerkleTransitionState`
plumbing with a direct read from the binary transition registry system
contract at `params.BinaryTransitionRegistryAddress`. The registry
exposes the transition state via fixed storage slots; a tiny
`StorageReader` interface (`Storage(addr, slot) (Hash, error)`)
captures what the loader needs.
`LoadTransitionState` now takes a `StorageReader` instead of an
`ethdb.KeyValueReader` and returns `nil` when the registry has not been
initialised (slot 0 unset). `IsTransitionActive` is exposed for callers
that only need the started flag.
`core/state/reader.go:newUBTTrieReader` is updated:
- It now takes the binary triedb, an optional MPT triedb, and a
`wrapInTransitionTrie` flag so callers can opt out of the wrap.
- It uses a small `binTrieStorageReader` adapter to query the
registry directly from the binary trie at the requested root,
avoiding the MPT key-hashing in `flatReader`.
- When wrap=true and the registry's BaseRoot is non-zero, the MPT
base is opened against the supplied MPT triedb. With the current
callers (mptdb=nil) the wrap degenerates to a passthrough,
preserving existing master semantics until the dual-triedb routing
lands in the next commit.
The dead `rawdb` accessors and `VerkleTransitionStatePrefix` schema
constant are removed.
This Pr implements some prerequisite changes for #34004 : split the
`CachingDB` into a `MerkleDB` and a `UBTDB`, so that very different
behaviors don't clash as much.
The transition isn't handled by this PR, but after talking to Gary we
agreed that `UBTDB` should receive another `triedb`, which will only be
loaded if the `Ended` flag is set to false in the conversion contract.
If this is too hard to achieve, it makes sense to load it regardless,
and then loading can be prevented at a later stage by adding a
`UBTTransitionFinalizationTime` in `ChainConfig`.
---------
Co-authored-by: Gary Rong <garyrong0905@gmail.com>
This change ensures TransitionState.Copy preserves BaseRoot. During a
Verkle transition, ts.BaseRoot is required to construct the overlay MPT
when ts.InTransition() is true. Previously, copies dropped BaseRoot,
risking an invalid zero-hash base trie and inconsistent behavior.
This is the first part of #31532
It maintains a series of conversion maker which are to be updated by the
conversion code (in a follow-up PR, this is a breakdown of a larger PR
to make things easier to review). They can be used in this way:
- During the conversion, by storing the conversion markers when the
block has been processed. This is meant to be written in a function that
isn't currently present, hence [this
TODO](https://github.com/ethereum/go-ethereum/pull/31634/files#diff-89272f61e115723833d498a0acbe59fa2286e3dc7276a676a7f7816f21e248b7R384).
Part of https://github.com/ethereum/go-ethereum/issues/31583
---------
Signed-off-by: Guillaume Ballet <3272758+gballet@users.noreply.github.com>
Co-authored-by: Gary Rong <garyrong0905@gmail.com>
