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43 lines
1.0 KiB
Nim
43 lines
1.0 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2020 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import chronos
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type
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Source*[T] = iterator(): Future[T] {.closure.}
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Through*[T] = proc(i: Source[T]): Source[T]
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Sink*[T] = proc(i: Source[T]): Future[void]
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Duplex*[T] = Source[T] | Sink[T]
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Stream* = ref object of RootObj
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closed*: bool
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eof*: bool
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method source*(s: Stream): Source[seq[byte]] {.base.} =
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doAssert(false, "Not implemented!")
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method sink*(s: Stream): Sink[seq[byte]] {.base.} =
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doAssert(false, "Not implemented!")
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proc atEof*(s: Stream): bool =
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s.eof
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proc close*(s: Stream) {.async.} =
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s.closed = true
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proc duplex*[T](s: Stream): (Source[T], Sink[T]) =
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(s.source, s.sink)
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iterator items*[T](i: Source[T]): Future[T] =
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while true:
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var item = i()
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if i.finished:
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break
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yield item
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