90 lines
2.8 KiB
Nim
90 lines
2.8 KiB
Nim
# nimbus-eth1
|
|
# Copyright (c) 2021 Status Research & Development GmbH
|
|
# Licensed under either of
|
|
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
|
|
# http://www.apache.org/licenses/LICENSE-2.0)
|
|
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
|
|
# http://opensource.org/licenses/MIT)
|
|
# at your option. This file may not be copied, modified, or distributed
|
|
# except according to those terms.
|
|
|
|
## Constructors for Aristo DB
|
|
## ==========================
|
|
##
|
|
|
|
{.push raises: [].}
|
|
|
|
import
|
|
stew/results,
|
|
./aristo_init/[aristo_init_common, aristo_memory, aristo_rocksdb],
|
|
./aristo_desc,
|
|
./aristo_desc/aristo_types_backend
|
|
|
|
export
|
|
AristoBackendType, AristoStorageType, AristoTypedBackendRef
|
|
|
|
# ------------------------------------------------------------------------------
|
|
# Public database constuctors, destructor
|
|
# ------------------------------------------------------------------------------
|
|
|
|
proc init*(
|
|
T: type AristoDb;
|
|
backend: static[AristoBackendType];
|
|
basePath: string;
|
|
): Result[T, AristoError] =
|
|
## Generic constructor, `basePath` argument is ignored for `BackendNone` and
|
|
## `BackendMemory` type backend database. Also, both of these backends
|
|
## aways succeed initialising.
|
|
when backend == BackendNone:
|
|
ok T(top: AristoLayerRef())
|
|
|
|
elif backend == BackendMemory:
|
|
ok T(top: AristoLayerRef(), backend: memoryBackend())
|
|
|
|
elif backend == BackendRocksDB:
|
|
let rc = rocksDbBackend basePath
|
|
if rc.isErr:
|
|
return err(rc.error)
|
|
ok T(top: AristoLayerRef(), backend: rc.value)
|
|
|
|
else:
|
|
{.error: "Unknown/unsupported Aristo DB backend".}
|
|
|
|
proc init*(
|
|
T: type AristoDb;
|
|
backend: static[AristoBackendType];
|
|
): T =
|
|
## Simplified prototype for `BackendNone` and `BackendMemory` type backend.
|
|
when backend == BackendNone:
|
|
T(top: AristoLayerRef())
|
|
|
|
elif backend == BackendMemory:
|
|
T(top: AristoLayerRef(), backend: memoryBackend())
|
|
|
|
elif backend == BackendRocksDB:
|
|
{.error: "Aristo DB backend \"BackendRocksDB\" needs basePath argument".}
|
|
|
|
else:
|
|
{.error: "Unknown/unsupported Aristo DB backend".}
|
|
|
|
# -----------------
|
|
|
|
proc finish*(db: var AristoDb; flush = false) =
|
|
## backend destructor. The argument `flush` indicates that a full database
|
|
## deletion is requested. If set ot left `false` the outcome might differ
|
|
## depending on the type of backend (e.g. the `BackendMemory` backend will
|
|
## always flush on close.)
|
|
if not db.backend.isNil:
|
|
db.backend.closeFn flush
|
|
db.top = AristoLayerRef(nil)
|
|
db.stack.setLen(0)
|
|
|
|
|
|
proc to*[W: MemBackendRef|RdbBackendRef](db: AristoDb; T: type W): T =
|
|
## Handy helper for lew-level access to some backend functionality
|
|
db.backend.T
|
|
|
|
# ------------------------------------------------------------------------------
|
|
# End
|
|
# ------------------------------------------------------------------------------
|