42 lines
1.0 KiB
Nim
42 lines
1.0 KiB
Nim
import eth_trie/db, ranges
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type
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CaptureFlags* {.pure.} = enum
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PersistPut
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PersistDel
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DB = TrieDatabaseRef
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BytesRange = Range[byte]
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CaptureDB* = ref object of RootObj
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srcDb: DB
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dstDb: DB
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flags: set[CaptureFlags]
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proc get*(db: CaptureDB, key: openArray[byte]): seq[byte] =
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result = db.dstDb.get(key)
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if result.len != 0: return
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result = db.srcDb.get(key)
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if result.len != 0:
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db.dstDb.put(key, result)
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proc put*(db: CaptureDB, key, value: openArray[byte]) =
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db.dstDb.put(key, value)
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if CaptureFlags.PersistPut in db.flags:
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db.srcDb.put(key, value)
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proc contains*(db: CaptureDB, key: openArray[byte]): bool =
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result = db.srcDb.contains(key)
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assert(db.dstDb.contains(key) == result)
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proc del*(db: CaptureDB, key: openArray[byte]) =
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db.dstDb.del(key)
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if CaptureFlags.PersistDel in db.flags:
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db.srcDb.del(key)
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proc newCaptureDB*(srcDb, dstDb: DB, flags: set[CaptureFlags] = {}): CaptureDB =
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result.new()
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result.srcDb = srcDb
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result.dstDb = dstDb
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result.flags = flags
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