Backward compatible async/await for URLSession!

Related tags

Utility swift swift-package-manager urlsession swift-5-5 swift-concurrency
Overview

URLSessionBackport

Test Status

URLSessionBackport aims to make it possible to use URLSession's new async/await syntax on older OSs, namely iOS 13 or macOS 10.15 and newer. Note that Xcode 13.2 is required, as that version contains the necessary back-ported async/await libraries.

Installation

Add URLSessionBackport as a dependency in your Package.swift file to start using it. Then, add import URLSessionBackport to any file you wish to use the library in.

Please check the releases for recommended versions.

dependencies: [
    .package(url: "https://github.com/mochidev/URLSessionBackport.git", .upToNextMinor(from: "1.0.0")),
],
...
targets: [
    .target(
        name: "MyPackage",
        dependencies: [
            "URLSessionBackport",
        ]
    )
]

What is URLSessionBackport?

URLSessionBackport adds a single property to your URLSession instances: .backport. The best part? Within this namespace, URLSession's async/await methods have been magically re-implemented, allowing you access to them on iOS 13 or macOS 10.15 and newer! Additionally, the methods are automatically marked as deprecated, so they'll let you know when it's safe to remove them.

Contributing

Contribution is welcome! Please take a look at the issues already available, or start a new issue to discuss a new feature. Although guarantees can't be made regarding feature requests, PRs that fit with the goals of the project and that have been discussed before-hand are more than welcome!

Please make sure that all submissions have clean commit histories, are well documented, and thoroughly tested. Please rebase your PR before submission rather than merge in main. Linear histories are required.

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Comments
  • Using URLSession.backport.bytes(for:) causing crash

    Using URLSession.backport.bytes(for:) causing crash

    First at all, thanks a lot for taking the time to create a library that backports the async/await versions of URLSession to iOS 14.

    I am currently implementing some feature based on URLSession.bytes(for:) in my codebase. I still need to support iOS 14 and therefore found your library. In general the port works, but unfortunately not reliably. I often face crashes related to EXC_BAD_ACCESS or SIGABRT. When using an iOS 15 simulator, and therefore using the system provided methods the crash is not appearing,

    I already tried to debug it a little, and it always crashes within the DataAccumulator. But at random places. Sometimes when data is added to the internal buffer or sometimes when reading from it. But the place seems to be random. I assume that there are some race conditions when the data receival is ending.

    • Maybe the .success case is already causing the data accumulator to be deallocated but another continuation is still running ?
    • Or maybe some other race condition is occuring, not sure unfortunately :/

    Some examplary stack trace:

    First Example

    2022-06-20 21:03:10.358559+0200 URLSessionBackportTest[24786:502404] [] nw_protocol_get_quic_image_block_invoke dlopen libquic failed
URLSessionBackportTest(24786,0x700007ae8000) malloc: Incorrect checksum for freed object 0x7f807c40f288: probably modified after being freed.
Corrupt value: 0xffffffe00000000
URLSessionBackportTest(24786,0x700007ae8000) malloc: *** set a breakpoint in malloc_error_break to debug
URLSessionBackportTest(24786,0x700007ae8000) malloc: Incorrect checksum for freed object 0x7f807c40f288: probably modified after being freed.
Corrupt value: 0xffffffe00000000
CoreSimulator 802.6.1 - Device: iPhone 8 Plus (250B5764-5BFD-440B-A918-82B557B5A993) - Runtime: iOS 14.5 (18E182) - DeviceType: iPhone 8 Plus
(lldb)

    In the stack trace it can also be the seen where from the DataAccumulator this comes from:

    Screenshot 2022-06-20 at 21 32 36

    Second Example

    2022-06-20 21:36:20.604135+0200 URLSessionBackportTest[26678:539387] [] nw_protocol_get_quic_image_block_invoke dlopen libquic failed
URLSessionBackportTest(26678,0x70000a1da000) malloc: Incorrect checksum for freed object 0x7fe7d9905d18: probably modified after being freed.
Corrupt value: 0x2ffffffe00000000
URLSessionBackportTest(26678,0x70000a1da000) malloc: *** set a breakpoint in malloc_error_break to debug
URLSessionBackportTest(26678,0x70000a1da000) malloc: Incorrect checksum for freed object 0x7fe7d9905d18: probably modified after being freed.
Corrupt value: 0x2ffffffe00000000
CoreSimulator 802.6.1 - Device: iPhone 8 Plus (250B5764-5BFD-440B-A918-82B557B5A993) - Runtime: iOS 14.5 (18E182) - DeviceType: iPhone 8 Plus
(lldb)
    Screenshot 2022-06-20 at 21 36 29

    Third example

    Screenshot 2022-06-20 at 21 37 59

    I have also created a test repository which loads some image and also contains the kind of code I use the library with: https://github.com/alexanderwe/URLSessionBackportTest

    Any help with that is highly appreciated !

    opened by alexanderwe 1
  • Add Tests

    Add Tests

    Needs more tests to compare the esoteric cases to each other. I'm thinking of duplicating many of the tests with non-backported implementations, so if something nitty gritty changes (URL Session changes the order in which delegate methods are called, for instance), we can catch them.

    enhancement 
    opened by dimitribouniol 0
Releases(0.2.0)

  • 0.2.0(Nov 11, 2021)

    What's Changed

    • Added license by @dimitribouniol in https://github.com/mochidev/URLSessionBackport/pull/3
    • Async Bytes by @dimitribouniol in https://github.com/mochidev/URLSessionBackport/pull/1

    Hopefully with the next round of PRs (tests), I can call this a 1.0 🎉

    Full Changelog: https://github.com/mochidev/URLSessionBackport/compare/0.1.1...0.2.0

    Source code(tar.gz)
    Source code(zip)

  • 0.1.1(Nov 11, 2021)

    The actual first release 😉

    What's Changed

    • Tests Now Compile! by @dimitribouniol in https://github.com/mochidev/URLSessionBackport/pull/2

    Full Changelog: https://github.com/mochidev/URLSessionBackport/compare/0.1.0...0.1.1

    Source code(tar.gz)
    Source code(zip)

  • 0.1.0(Nov 11, 2021)

Owner
Mochi Development, Inc.
Mochi Development, Inc.
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