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https://github.com/ChimeHQ/ConcurrencyPlus
Utilities for working with Swift Concurrency
https://github.com/ChimeHQ/ConcurrencyPlus
async concurrency ios macos swift
Last synced: 3 months ago
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Utilities for working with Swift Concurrency
- Host: GitHub
- URL: https://github.com/ChimeHQ/ConcurrencyPlus
- Owner: ChimeHQ
- License: bsd-3-clause
- Archived: true
- Created: 2022-06-26T11:36:40.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2023-11-29T17:08:54.000Z (12 months ago)
- Last Synced: 2024-07-20T17:08:40.506Z (4 months ago)
- Topics: async, concurrency, ios, macos, swift
- Language: Swift
- Homepage:
- Size: 109 KB
- Stars: 253
- Watchers: 7
- Forks: 11
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
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# ConcurrencyPlus
Utilities for working with Swift Concurrency
⚠️ Better, more-focused libraries have since been extracted from this one. ⚠️
- For an async-compatible queue, check out [Queue](https://github.com/mattmassicotte/Queue)
- For async support in XPC, try [AsyncXPCConnection](https://github.com/ChimeHQ/AsyncXPCConnection)
- For help with MainActor stuff, see [MainOffender](https://github.com/mattmassicotte/MainOffender)
This is a really small library with some types and extensions that may be useful when working with Swift's concurrency system.
- A `TaskQueue` for queuing tasks in FIFO ordering
- `CheckedContinuation` extensions for improved ergonomics
- `Task` extensions for improved ergonomics when used to bridge to non-async code
- `NSXPCConnection` extensions for safe async integration
- `MainActor.runUnsafely` to help work around incorrectly- or insufficiently-annotated code not under your control
- `OwnershipTransferring` to move a non-Sendable value across actor boundaries
- `SendableBox` to lie to the compiler about Sendable conformance
- `RelaxedDispatchQueue` a very thin `DispatchQueue` wrapper with relaxed argument sendability constraints
## TaskQueue
```swift
let queue = TaskQueue()
queue.addOperation {
await asyncFunction()
await anotherAsyncFunction()
}
// This can can also return the underlying Task, so you can cancel, or await a value
let task = await queue.addOperation {
return await makeValue()
}
let value = try await task.value
```
```swift
// Without .ordered, the execution order of these tasks is not well-defined.
Task.ordered {
event1()
}
Task.ordered(priority: .background) {
event2()
}
Task.ordered {
event3()
}
```
## Task Ergonomics
Some handy functions that ease integration with existing callbacks.
```swift
func callbackOptionalPair(_ block: @escaping (Int?, Error?) -> Void) {
Task.relayResult(to: block) {
// ... return async value or throw...
}
}
func callbackResult(_ block: @escaping (Result) -> Void) {
Task.relayResult(to: block) {
// ... return async value or throw...
}
}
func callbackOptionalError(_ block: @escaping (Error?) -> Void) {
Task.relayResult(to: block) {
// ... possibly throw...
}
}
```
## OwnershipTransferring
This is a tool for moving a value across actor boundaries in a way that will keep the compiler happy. It is reasonably unsafe. You have to be very careful about how the moved value is accessed.
```swift
actor MyActor {
let nonSendable: UnsendableType
init(_ transfer: OwnershipTransferring) {
self.nonSendable = transfer.takeOwnership()
}
}
let nonSendable = UnsendableType()
let transfer = OwnershipTransferring(nonSendable)
let myActor = MyActor(transfer) // no warnings!
transfer.hasOwnershipBeenTransferred() // true
transfer.takeOwnership() // this will crash
```
## RelaxedDispatchQueue
`DispatchQueue` now has implicit `@Sendable` closure arguments. This is a highly-disruptive change, as it makes queues no longer feasible as a means of non-Sendable state protection. Wrap up that that queue and carry on.
```swift
let nonSendable = UnsendableType()
let queue = RelaxedDisptachQueue(label: "myqueue")
queue.async {
nonSendable.doThing() // no warnings
}
```
## Working with XPC
You might be tempted to make your XPC interface functions `async`. This approach does not handle connection failures and will violate the Structured Concurrency contract, resulting in hangs. See the post ["ExtensionKit and XPC"](https://www.chimehq.com/blog/extensionkit-xpc) for context.
This little `NSXPCConnection` extension provides a safe way to get into the async world.
```swift
func withContinuation(
function: String = #function,
_ body: (Service, CheckedContinuation) -> Void
) async throws -> T
```
There are also some extensions on `CheckedContinuation` to make it easier to use in the context of XPC. These are really handy for resuming from common reply patterns.
Given an XPC service like this in your code:
```swift
protocol XPCService {
func errorMethod(reply: (Error?) -> Void)
func valueAndErrorMethod(reply: (String?, Error?) -> Void)
func dataAndErrorMethod(reply: (Data?, Error?) -> Void)
}
```
The continuation helpers allow bridging like:
```swift
try await withContinuation { service, continuation in
service.errorMethod(reply: continuation.resumingHandler)
}
try await withContinuation { service, continuation in
service.valueAndErrorMethod(reply: continuation.resumingHandler)
}
// this one will try to use JSONDecoder on the resulting data
try await withContinuation { service, continuation in
service.dataAndErrorMethod(reply: continuation.resumingHandler)
}
```
## Other Useful Projects
These libraries might be useful and are definitely worth checking out as well.
- [AnyAsyncSequence](https://github.com/vsanthanam/AnyAsyncSequence): super-focused on addressing the lack of type-erased sequences
- [AsyncAlgorithms](https://github.com/apple/swift-async-algorithms): Apple-owned reactive extensions to `AsyncSequence`
- [AsyncExtensions](https://github.com/sideeffect-io/AsyncExtensions): Companion to AsyncAlgorithms to add additional reactive features
- [Asynchrone](https://github.com/reddavis/Asynchrone): Extensions to bring reactive features to `AsyncSequence`
## Suggestions or Feedback
We'd love to hear from you! Please open up an issue or pull request.
Please note that this project is released with a [Contributor Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.
[build status]: https://github.com/ChimeHQ/ConcurrencyPlus/actions
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[license]: https://opensource.org/licenses/BSD-3-Clause
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