59 lines
2.0 KiB
Nim
59 lines
2.0 KiB
Nim
import strutils, eth/db/kvstore
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export kvstore
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# Database access layer that turns errors in the database into Defects as the
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# code that uses it isn't equipped to handle errors of that kind - this should
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# be reconsidered when making more changes here.
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type DbBackend = enum
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sqlite,
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rocksdb,
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lmdb
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const
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nimbus_db_backend* {.strdefine.} = "rocksdb"
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dbBackend = parseEnum[DbBackend](nimbus_db_backend)
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type
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ChainDB* = ref object of RootObj
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kv: KvStoreRef
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# TODO KvStore is a virtual interface and TrieDB is a virtual interface - one
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# will be enough eventually - unless the TrieDB interface gains operations
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# that are not typical to KvStores
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proc get*(db: ChainDB, key: openArray[byte]): seq[byte] =
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var res: seq[byte]
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proc onData(data: openArray[byte]) = res = @data
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if db.kv.get(key, onData).expect("working database"):
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return res
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proc put*(db: ChainDB, key, value: openArray[byte]) =
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db.kv.put(key, value).expect("working database")
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proc contains*(db: ChainDB, key: openArray[byte]): bool =
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db.kv.contains(key).expect("working database")
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proc del*(db: ChainDB, key: openArray[byte]) =
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db.kv.del(key).expect("working database")
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when dbBackend == sqlite:
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import eth/db/kvstore_sqlite as database_backend
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proc newChainDB*(path: string): ChainDB =
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ChainDB(kv: kvStore SqKvStore.init(path, "nimbus").tryGet())
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elif dbBackend == rocksdb:
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import eth/db/kvstore_rocksdb as database_backend
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proc newChainDB*(path: string): ChainDB =
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ChainDB(kv: kvStore RocksStoreRef.init(path, "nimbus").tryGet())
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elif dbBackend == lmdb:
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# TODO This implementation has several issues on restricted platforms, possibly
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# due to mmap restrictions - see:
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# https://github.com/status-im/nim-beacon-chain/issues/732
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# https://github.com/status-im/nim-beacon-chain/issues/688
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# It also has other issues, including exception safety:
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# https://github.com/status-im/nim-beacon-chain/pull/809
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{.error: "lmdb deprecated, needs reimplementing".}
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export database_backend
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