70 lines
2.0 KiB
Nim
70 lines
2.0 KiB
Nim
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import
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hashes, eth_common
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type
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DBKeyKind* = enum
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genericHash
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blockNumberToHash
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blockHashToScore
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transactionHashToBlock
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canonicalHeadHash
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DbKey* = object
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# The first byte stores the key type. The rest are key-specific values
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data: array[33, byte]
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usedBytes: uint8
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StorageError* = object of Exception
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proc genericHashKey*(h: Hash256): DbKey {.inline.} =
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result.data[0] = byte ord(genericHash)
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result.data[1 .. 32] = h.data
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result.usedBytes = uint8 32
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proc blockHashToScoreKey*(h: Hash256): DbKey {.inline.} =
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result.data[0] = byte ord(blockHashToScore)
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result.data[1 .. 32] = h.data
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result.usedBytes = uint8 32
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proc transactionHashToBlockKey*(h: Hash256): DbKey {.inline.} =
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result.data[0] = byte ord(transactionHashToBlock)
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result.data[1 .. 32] = h.data
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result.usedBytes = uint8 32
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proc blockNumberToHashKey*(u: BlockNumber): DbKey {.inline.} =
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result.data[0] = byte ord(blockNumberToHash)
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assert sizeof(u) <= 32
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copyMem(addr result.data[1], unsafeAddr u, sizeof(u))
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result.usedBytes = uint8 sizeof(u)
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proc canonicalHeadHashKey*(): DbKey {.inline.} =
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result.data[0] = byte ord(canonicalHeadHash)
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result.usedBytes = 32
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const hashHolderKinds = {genericHash, blockHashToScore, transactionHashToBlock}
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template toOpenArray*(k: DbKey): openarray[byte] =
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k.data.toOpenArray(0, int k.usedBytes)
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proc hash*(k: DbKey): Hash =
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result = hash(k.toOpenArray)
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proc `==`*(a, b: DbKey): bool {.inline.} =
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equalMem(unsafeAddr a, unsafeAddr b, sizeof(a))
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template raiseStorageInitError* =
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raise newException(StorageError, "failure to initialize storage")
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template raiseKeyReadError*(key: auto) =
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raise newException(StorageError, "failed to read key " & $key)
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template raiseKeyWriteError*(key: auto) =
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raise newException(StorageError, "failed to write key " & $key)
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template raiseKeySearchError*(key: auto) =
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raise newException(StorageError, "failure during search for key " & $key)
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template raiseKeyDeletionError*(key: auto) =
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raise newException(StorageError, "failure to delete key " & $key)
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