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* Land `NIOAsyncChannel` as SPI # Motivation We want to provide bridges from NIO `Channel`s to Swift Concurrency. In previous PRs, we already landed the building blocks namely `NIOAsyncSequenceProducer` and `NIOAsyncWriter`. These two types are highly performant bridges between synchronous and asynchronous code that respect back-pressure. The next step is to build convenience methods that wrap a `Channel` with these two types. # Modification This PR adds a new type called `NIOAsyncChannel` that is capable of wrapping a `Channel`. This is done by adding two handlers to the channel pipeline that are bridging to the `NIOAsyncSequenceProducer` and `NIOAsyncWriter`. The new `NIOAsyncChannel` type exposes three properties. The underlying `Channel`, a `NIOAsyncChannelInboundStream` and a `NIOAsyncChannelOutboundWriter`. Using these three types the user a able to read/write into the channel using `async` methods. Importantly, we are landing all of this behind the `@_spi(AsyncChannel`. This allows us to merge PRs while we are still working on the remaining parts such as protocol negotiation. # Result We have the first part necessary for our async bridges. Follow up PRs will include the following things: 1. Bootstrap support 2. Protocol negotiation support 3. Example with documentation * Add AsyncSequence bridge to NIOAsyncChannelOutboundWriter * Code review * Prefix temporary spi public method * Rename writeAndFlush to write |
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| AsyncChannelTests.swift | ||