nimbus-eth1/nimbus/db/capturedb.nim

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