package wasi:io@0.2.0;

interface poll {
  resource pollable {
    ready: func() -> bool;
    block: func();
  }

  poll: func(in: list<borrow<pollable>>) -> list<u32>;
}

interface error {
  resource error {
    to-debug-string: func() -> string;
  }
}

interface streams {
  use error.{error};
  use poll.{pollable};

  variant stream-error {
    last-operation-failed(error),
    closed,
  }

  resource input-stream {
    read: func(len: u64) -> result<list<u8>, stream-error>;
    blocking-read: func(len: u64) -> result<list<u8>, stream-error>;
    skip: func(len: u64) -> result<u64, stream-error>;
    blocking-skip: func(len: u64) -> result<u64, stream-error>;
    subscribe: func() -> pollable;
  }

  resource output-stream {
    check-write: func() -> result<u64, stream-error>;
    write: func(contents: list<u8>) -> result<_, stream-error>;
    blocking-write-and-flush: func(contents: list<u8>) -> result<_, stream-error>;
    flush: func() -> result<_, stream-error>;
    blocking-flush: func() -> result<_, stream-error>;
    subscribe: func() -> pollable;
    write-zeroes: func(len: u64) -> result<_, stream-error>;
    blocking-write-zeroes-and-flush: func(len: u64) -> result<_, stream-error>;
    splice: func(src: borrow<input-stream>, len: u64) -> result<u64, stream-error>;
    blocking-splice: func(src: borrow<input-stream>, len: u64) -> result<u64, stream-error>;
  }
}