mirror of
https://github.com/logos-storage/nim-datastore.git
synced 2026-01-03 06:03:06 +00:00
90 lines
2.6 KiB
Nim
90 lines
2.6 KiB
Nim
import std/hashes
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import ./sharedptr
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export hashes
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export sharedptr
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type
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DataBufferHolder* = object
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buf: ptr UncheckedArray[byte]
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size: int
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DataBuffer* = SharedPtr[DataBufferHolder] ##\
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## A fixed length data buffer using a SharedPtr.
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## It is thread safe even with `refc` since
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## it doesn't use string or seq types internally.
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##
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KeyBuffer* = DataBuffer
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ValueBuffer* = DataBuffer
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StringBuffer* = DataBuffer
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CatchableErrorBuffer* = object
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msg: StringBuffer
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proc `=destroy`*(x: var DataBufferHolder) =
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## copy pointer implementation
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if x.buf != nil:
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# when isMainModule or true:
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# echo "buffer: FREE: ", repr x.buf.pointer
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deallocShared(x.buf)
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proc len*(a: DataBuffer): int = a[].size
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proc isNil*(a: DataBuffer): bool = sharedptr.isNil(a)
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proc hash*(a: DataBuffer): Hash =
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a[].buf.toOpenArray(0, a[].size-1).hash()
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proc `==`*(a, b: DataBuffer): bool =
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if a.isNil and b.isNil: return true
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elif a.isNil or b.isNil: return false
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elif a[].size != b[].size: return false
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elif a[].buf == b[].buf: return true
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else: a.hash() == b.hash()
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proc new*(tp: typedesc[DataBuffer], size: int = 0): DataBuffer =
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## allocate new buffer with given size
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newSharedPtr(DataBufferHolder(
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buf: cast[typeof(result[].buf)](allocShared0(size)),
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size: size,
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))
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proc new*[T: byte | char](tp: typedesc[DataBuffer], data: openArray[T]): DataBuffer =
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## allocate new buffer and copies indata from openArray
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##
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result = DataBuffer.new(data.len)
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if data.len() > 0:
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copyMem(result[].buf, unsafeAddr data[0], data.len)
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proc toSeq*[T: byte | char](a: DataBuffer, tp: typedesc[T]): seq[T] =
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## convert buffer to a seq type using copy and either a byte or char
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result = newSeq[T](a.len)
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copyMem(addr result[0], unsafeAddr a[].buf[0], a.len)
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proc toString*(data: DataBuffer): string =
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## convert buffer to string type using copy
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if data.isNil: return ""
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result = newString(data.len())
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if data.len() > 0:
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copyMem(addr result[0], unsafeAddr data[].buf[0], data.len)
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proc toCatchable*(err: CatchableErrorBuffer): ref CatchableError =
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## convert back to a ref CatchableError
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result = (ref CatchableError)(msg: err.msg.toString())
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proc toBuffer*(err: ref Exception): CatchableErrorBuffer =
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## convert exception to an object with StringBuffer
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return CatchableErrorBuffer(
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msg: StringBuffer.new(err.msg)
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)
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import ../key
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import stew/results
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proc new*(tp: typedesc[KeyBuffer], key: Key): KeyBuffer =
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KeyBuffer.new(key.id())
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proc toKey*(kb: KeyBuffer): Result[Key, ref CatchableError] =
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Key.init(kb.toString())
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