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RLP StreamReader #148

Description

@wjmelements

What feature should we add?

While messages from a stream might normally need delineation, the length prefix of RLP makes delimiters redundant. Also, no delimiter can be valid for RLP. I am requesting a way to read complete rlp-encoded messages from a stream (eg sys.stdin).

Essentially it should work similar to asyncio.StreamReader.readline() but read an entire RLP message rather than a utf-8 line.

Usage

reader = rlp.StreamReader()
pipe_protocol = asyncio.StreamReaderProtocol(reader)
loop = asyncio.get_event_loop()
await loop.connect_read_pipe(
    lambda: pipe_protocol, sys.stdin
)
message = await reader.read()

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