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https://github.com/unclechu/gRPC-haskell.git
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98 lines
3.7 KiB
Plaintext
98 lines
3.7 KiB
Plaintext
{-# LANGUAGE StandaloneDeriving #-}
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module Network.GRPC.Unsafe.ByteBuffer where
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#include <grpc/grpc.h>
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#include <grpc/slice.h>
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#include <grpc/impl/codegen/compression_types.h>
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#include <grpc/slice_buffer.h>
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#include <grpc_haskell.h>
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{#import Network.GRPC.Unsafe.Slice#}
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{#import Network.GRPC.Unsafe.ChannelArgs#}
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import Control.Exception (bracket)
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import qualified Data.ByteString as B
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import Foreign.Ptr
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import Foreign.C.Types
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import Foreign.Storable
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-- | Represents a pointer to a gRPC byte buffer containing 1 or more 'Slice's.
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-- Must be destroyed manually with 'grpcByteBufferDestroy'.
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{#pointer *grpc_byte_buffer as ByteBuffer newtype #}
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deriving instance Show ByteBuffer
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--Trivial Storable instance because 'ByteBuffer' type is a pointer.
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instance Storable ByteBuffer where
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sizeOf (ByteBuffer r) = sizeOf r
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alignment (ByteBuffer r) = alignment r
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peek p = fmap ByteBuffer (peek (castPtr p))
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poke p (ByteBuffer r) = poke (castPtr p) r
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--TODO: When I switched this to a ForeignPtr with a finalizer, I got errors
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--about freeing un-malloced memory. Calling the same destroy function by hand
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--works fine in the same code, though. Until I find a workaround, going to free
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--everything by hand.
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-- | Represents a pointer to a ByteBufferReader. Must be destroyed manually with
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-- 'byteBufferReaderDestroy'.
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{#pointer *grpc_byte_buffer_reader as ByteBufferReader newtype #}
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-- | Creates a pointer to a 'ByteBuffer'. This is used to receive data when
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-- creating a GRPC_OP_RECV_MESSAGE op.
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{#fun unsafe create_receiving_byte_buffer as ^ {} -> `Ptr ByteBuffer' id#}
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{#fun unsafe destroy_receiving_byte_buffer as ^ {id `Ptr ByteBuffer'} -> `()'#}
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withByteBufferPtr :: (Ptr ByteBuffer -> IO a) -> IO a
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withByteBufferPtr
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= bracket createReceivingByteBuffer destroyReceivingByteBuffer
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-- | Takes an array of slices and the length of the array and returns a
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-- 'ByteBuffer'.
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{#fun grpc_raw_byte_buffer_create as ^ {`Slice', `CULong'} -> `ByteBuffer'#}
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{#fun grpc_raw_compressed_byte_buffer_create as ^
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{`Slice', `CULong', `CompressionAlgorithm'} -> `ByteBuffer'#}
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{#fun unsafe grpc_byte_buffer_copy as ^ {`ByteBuffer'} -> `ByteBuffer'#}
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{#fun unsafe grpc_byte_buffer_length as ^ {`ByteBuffer'} -> `CULong'#}
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{#fun unsafe grpc_byte_buffer_destroy as ^ {`ByteBuffer'} -> `()'#}
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{#fun unsafe byte_buffer_reader_create as ^ {`ByteBuffer'} -> `ByteBufferReader'#}
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{#fun unsafe byte_buffer_reader_destroy as ^ {`ByteBufferReader'} -> `()'#}
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{#fun grpc_byte_buffer_reader_next as ^
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{`ByteBufferReader', `Slice'} -> `CInt'#}
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-- | Returns a 'Slice' containing the entire contents of the 'ByteBuffer' being
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-- read by the given 'ByteBufferReader'.
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{#fun unsafe grpc_byte_buffer_reader_readall_ as ^ {`ByteBufferReader'} -> `Slice'#}
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{#fun unsafe grpc_raw_byte_buffer_from_reader as ^
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{`ByteBufferReader'} -> `ByteBuffer'#}
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withByteStringAsByteBuffer :: B.ByteString -> (ByteBuffer -> IO a) -> IO a
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withByteStringAsByteBuffer bs f = do
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bracket (byteStringToSlice bs) freeSlice $ \slice -> do
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bracket (grpcRawByteBufferCreate slice 1) grpcByteBufferDestroy f
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-- Creates a 'ByteBuffer'. We also return the slice we needed to allocate to
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-- create it. It is the caller's responsibility to free both when finished using
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-- the byte buffer. In most cases, one should prefer to use
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-- 'withByteStringAsByteBuffer' if possible.
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createByteBuffer :: B.ByteString -> IO (ByteBuffer, Slice)
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createByteBuffer bs = do
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slice <- byteStringToSlice bs
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bb <- grpcRawByteBufferCreate slice 1
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return (bb, slice)
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copyByteBufferToByteString :: ByteBuffer -> IO B.ByteString
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copyByteBufferToByteString bb = do
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bracket (byteBufferReaderCreate bb) byteBufferReaderDestroy $ \bbr -> do
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bracket (grpcByteBufferReaderReadall bbr) freeSlice sliceToByteString
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