Commit Graph

7 Commits

Author SHA1 Message Date
Jordan Hrycaj 3e88589eb1
Optional accounts cache module for creating genesis (#1897)
* Split off `ReadOnlyStateDB` from `AccountStateDB` from `state_db.nim`

why:
  Apart from testing, applications use `ReadOnlyStateDB` as an easy
  way to access the accounts ledger. This is well supported by the
  `Aristo` db, but writable mode is only parially supported.

  The writable AccountStateDB` object for modifying accounts is not
  used by production code.

  So, for lecgacy and testing apps, the full support of the previous
  `AccountStateDB` is now enabled by `import db/state_db/read_write`
  and the `import db/state_db` provides read-only mode.

* Encapsulate `AccountStateDB` as `GenesisLedgerRef` or genesis creation

why:
  `AccountStateDB` has poor support for `Aristo` and is not widely used
   in favour of `AccountsLedger` (which will be abstracted as `ledger`.)

   Currently, using other than the `AccountStateDB` ledgers within the
   `GenesisLedgerRef` wrapper is experimental and test only. Eventually,
    the wrapper should disappear so that the `Ledger` object (which
    encapsulates `AccountsCache` and `AccountsLedger`) will prevail.

* For the `Ledger`, provide access to raw accounts `MPT`

why:
  This gives to the `CoreDbMptRef` descriptor from the `CoreDb` (which is
  the legacy version of 	CoreDxMptRef`.) For the new `ledger` API, the
  accounts are based on the `CoreDxMAccRef` descriptor which uses a
  particular sub-system for accounts while legacy applications use the
  `CoreDbPhkRef` equivalent of the `SecureHexaryTrie`.

  The only place where this feature will currently be used is the
 `genesis.nim` source file.

* Fix `Aristo` bugs, missing boundary checks, typos, etc.

* Verify root vertex in `MPT` and account constructors

why:
  Was missing so far, in particular the accounts constructor must
  verify `VertexID(1)

* Fix include file
2023-11-20 11:51:43 +00:00
Jordan Hrycaj c47f021596
Core db and aristo updates for destructor and tx logic (#1894)
* Disable `TransactionID` related functions from `state_db.nim`

why:
  Functions `getCommittedStorage()` and `updateOriginalRoot()` from
  the `state_db` module are nowhere used. The emulation of a legacy
  `TransactionID` type functionality is administratively expensive to
  provide by `Aristo` (the legacy DB version is only partially
  implemented, anyway).

  As there is no other place where `TransactionID`s are used, they will
  not be provided by the `Aristo` variant of the `CoreDb`. For the
  legacy DB API, nothing will change.

* Fix copyright headers in source code

* Get rid of compiler warning

* Update Aristo code, remove unused `merge()` variant, export `hashify()`

why:
  Adapt to upcoming `CoreDb` wrapper

* Remove synced tx feature from `Aristo`

why:
+ This feature allowed to synchronise transaction methods like begin,
  commit, and rollback for a group of descriptors.
+ The feature is over engineered and not needed for `CoreDb`, neither
  is it complete (some convergence features missing.)

* Add debugging helpers to `Kvt`

also:
  Update database iterator, add count variable yield argument similar
  to `Aristo`.

* Provide optional destructors for `CoreDb` API

why;
  For the upcoming Aristo wrapper, this allows to control when certain
  smart destruction and update can take place. The auto destructor works
  fine in general when the storage/cache strategy is known and acceptable
  when creating descriptors.

* Add update option for `CoreDb` API function `hash()`

why;
  The hash function is typically used to get the state root of the MPT.
  Due to lazy hashing, this might be not available on the `Aristo` DB.
  So the `update` function asks for re-hashing the gurrent state changes
  if needed.

* Update API tracking log mode: `info` => `debug

* Use shared `Kvt` descriptor in new Ledger API

why:
  No need to create a new descriptor all the time
2023-11-16 19:35:03 +00:00
Jordan Hrycaj 4feaa2cfab
Aristo db update for short nodes key edge cases (#1887)
* Aristo: Provide key-value list signature calculator

detail:
  Simple wrappers around `Aristo` core functionality

* Update new API for `CoreDb`

details:
+ Renamed new API functions `contains()` => `hasKey()` or `hasPath()`
  which disables the `in` operator on non-boolean 	`contains()` functions
+ The functions `get()` and `fetch()` always return a not-found error if
  there is no item, available. The new functions `getOrEmpty()` and
  `mergeOrEmpty()` return an an empty `Blob` if there is no such key
  found.

* Rewrite `core_apps.nim` using new API from `CoreDb`

* Use `Aristo` functionality for calculating Merkle signatures

details:
  For debugging, the `VerifyAristoForMerkleRootCalc` can be set so
  that `Aristo` results will be verified against the legacy versions.

* Provide general interface for Merkle signing key-value tables

details:
  Export `Aristo` wrappers

* Activate `CoreDb` tests

why:
  Now, API seems to be stable enough for general tests.

* Update `toHex()` usage

why:
  Byteutils' `toHex()` is superior to `toSeq.mapIt(it.toHex(2)).join`

* Split `aristo_transcode` => `aristo_serialise` + `aristo_blobify`

why:
+ Different modules for different purposes
+ `aristo_serialise`: RLP encoding/decoding
+ `aristo_blobify`: Aristo database encoding/decoding

* Compacted representation of small nodes' links instead of Keccak hashes

why:
  Ethereum MPTs use Keccak hashes as node links if the size of an RLP
  encoded node is at least 32 bytes. Otherwise, the RLP encoded node
  value is used as a pseudo node link (rather than a hash.) Such a node
  is nor stored on key-value database. Rather the RLP encoded node value
  is stored instead of a lode link in a parent node instead. Only for
  the root hash, the top level node is always referred to by the hash.

  This feature needed an abstraction of the `HashKey` object which is now
  either a hash or a blob of length at most 31 bytes. This leaves two
  ways of representing an empty/void `HashKey` type, either as an empty
  blob of zero length, or the hash of an empty blob.

* Update `CoreDb` interface (mainly reducing logger noise)

* Fix copyright years (to make `Lint` happy)
2023-11-08 12:18:32 +00:00
Jordan Hrycaj 3198ad1bbd
Fix default pruning for ledger and update core db and ledger logging (#1861)
* Make sure that storage tries are not pruned (by default) on the new Ledger API

why:
  Pruning might kill some unwanted entries from storage tries ending up with an unstable database
  leading to crashes.

* Implement `CoreDb` and `LedgerRef` API tracing

details:
+ Locally enabled at compile time via constants `ProvideCoreDbLegacyAPI`
  and `EnableApiTracking` in either `base.nim` source
+ If enabled it can be selectively turned on/off via public switches in
  the `CoreDb` descriptor.

* Allow suppressing opportunistic `ifNecessaryGetXxx()` functions

why:
  Better troubleshooting when the system crashes (assertions will then
  most probably happen outside an `async` function.)
2023-10-25 15:03:09 +01:00
Jordan Hrycaj e8ad950e0a
Ledger abstraction for accounts cache (#1824)
* Provide TDD/debug facility for inspecting `persistBlocks()` working

detail:
+ Make sure that the last block of a test sample is the first batch
  item in `persistBlocks()`.
+ Additionally, allow `AccountsCache` API tracing by setting the flag
  `extraTraceMessages = true` in the file `accounts_cache.nim`

* Overload AccountsCache by abstraction wrapper

details:
  Can facilitate CoreDb API switch, details in `ledger/README.md`.
2023-10-18 20:27:22 +01:00
Jordan Hrycaj 1ffac5b2ea
Fudge persistent legacy hexary db edge case (#1817)
details:
  Persistent pruning would not restore the `emptyRlp` value for the
  root node when the database becomes empty. This effects to an
  assertion exception next time the DB is accessed.

  As most unit tests run on the memory DB, this case slipped through
  unnoticed for a while (see also issue #9.)
2023-10-12 21:10:04 +01:00
Jordan Hrycaj 395580ff9d
Aristo and core db updates (#1800)
* Aristo: remove obsolete functions

* Aristo: Fix error code for non-available hash keys

why:
  Must not return `not-found` when the key is not available (i.e. the
  current changes were not hashified, yet.)

* CoreDB: Provide TDD and test framework
2023-10-03 12:56:13 +01:00