Swift async/await based socket

Related tags

Networking Socket
Overview

Socket

Swift async/await based socket library

Introduction

This library exposes an idiomatic Swift API for interacting with POSIX sockets via an async/await interface. What makes this library unique (even to the point that Swift NIO is still using a custom socket / thread pool) is that it was built exclusively using Swift Concurrency and doesn't use old blocking C APIs, CFSocket, DispatchIO, CFRunloop, GCD, or explicitly create a single thread outside of the Swift's global cooperative thread pool to manage the sockets and polling.

The result is a Socket API that is optimized for async/await and built from the group up. Additionally, like the System, and Concurrency APIs, the Socket is represented as a struct instead of a class, greatly reducing ARC overhead. The internal state for the socket is managed by a singleton that stores both its state, and keeps an array of managed file descriptors so polling is global.

Goals

  • Minimal overhead for Swift Async/Await
  • Minimal ARC overhead, keep state outside of Socket
  • Avoid thread explosion and overcomitting the system
  • Use actors to prevent blocking threads
  • Optimize polling and C / System API usage
  • Low energy usage and memory overhead
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Comments
  • Is there any example to use Socket as a TCP client?

    Is there any example to use Socket as a TCP client?

    Firstly, thank you for this interesting project.

    I'm attempting to create a TCP client using Socket.

    I already tried the following code:

    import Socket

@main
struct App {
    static func main() async throws {
        let socket = try await Socket(IPv4Protocol.tcp)
        defer { Task { await socket.close() } }
        let address = IPv4SocketAddress(address: .init(127, 0, 0, 1), port: 8620)
        try await socket.fileDescriptor.connect(to: address, sleep: 1_000_000)
        try await socket.write(.init("foobar".utf8))
        print("sent")
    }
}

    but it didn't work and threw the following error:

    Swift/ErrorType.swift:200: Fatal error: Error raised at top level: Socket is already connected

    Does anyone know any good example for this use case? Thanks.

    opened by kkk669 2
  • Removed assertion failure when poll() on invalid socket

    Removed assertion failure when poll() on invalid socket

    This is a valid error condition that can be hit when, for example, connect() is called and returned error. The socket is in an invalid state but this assertion failure crashes the app before proper error handling can be done elsewhere.

    opened by osy 0
  • Adds support for sending and receiving messages

    Adds support for sending and receiving messages

    Issue

    None

    What does this PR Do?

    Adds support for sending and receiving messages

    Where should the reviewer start?

    Socket.swift, SocketManager.swift, then SocketOperations.swift.

    opened by paulofaria 0
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