Module chain

Provides high-level access to database whole-chain:

• history trees
• chain value pools

This module makes sure that:

• all disk writes happen inside a RocksDB transaction, and
• format-specific invariants are maintained.

Correctness

crate::constants::state_database_format_version_in_code() must be incremented each time the database format (column, serialization, etc) changes.

Constants

• CHAIN_VALUE_POOLS
  The name of the chain value pools column family.
• HISTORY_TREE
  The name of the History Tree column family.

Type Aliases

• ChainValuePoolsCf
  The type for reading value pools from the database.
• HistoryTreePartsCf
  The type for reading history trees from the database.
• LegacyHistoryTreePartsCf
  The legacy (1.3.0 and earlier) type for reading history trees from the database. This type should not be used in new code.
• RawHistoryTreePartsCf
  A generic raw key type for reading history trees from the database, regardless of the database version. This type should not be used in new code.