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https://github.com/logos-storage/nim-datastore.git
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64 lines
1.9 KiB
Nim
64 lines
1.9 KiB
Nim
# import std/atomics
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import threading/smartptrs
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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 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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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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