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Add async stream interfaces #51

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f563389
Add async stream interfaces
haeseoklee May 20, 2026
19fb4a5
Add async lifecycle helpers
haeseoklee May 21, 2026
360443c
Add concurrency helpers to Xcode project
haeseoklee May 21, 2026
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18 changes: 18 additions & 0 deletions Package.resolved
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4 changes: 3 additions & 1 deletion Package.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -11,14 +11,16 @@ let package = Package(
],
dependencies: [
.package(url: "https://github.com/ReactiveX/RxSwift", "6.9.0"..<"7.0.0"),
.package(url: "https://github.com/apple/swift-async-algorithms", from: "1.0.0"),
.package(url: "https://github.com/mattgallagher/CwlPreconditionTesting.git", from: "2.2.2"), // for testTarget only
],
targets: [
.target(
name: "RIBs",
dependencies: [
.product(name: "RxSwift", package: "RxSwift"),
.product(name: "RxRelay", package: "RxSwift")
.product(name: "RxRelay", package: "RxSwift"),
.product(name: "AsyncAlgorithms", package: "swift-async-algorithms")
],
path: "RIBs"
),
Expand Down
28 changes: 28 additions & 0 deletions RIBs.xcodeproj/project.pbxproj
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Expand Up @@ -33,6 +33,11 @@
AFB7D4031FC81C8F00045D2B /* Foundation+ExtensionsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = AF82F6731FC81B5F006DF7BC /* Foundation+ExtensionsTests.swift */; };
AFB7D4051FC81D6100045D2B /* LaunchRouterTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = AFB7D4041FC81D6100045D2B /* LaunchRouterTests.swift */; };
BF5FC0F122808377004235F1 /* RxRelay.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = BF5FC0F022808377004235F1 /* RxRelay.framework */; };
C0A100012B10000100A10001 /* Observable+AsyncSequence.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0A100032B10000100A10001 /* Observable+AsyncSequence.swift */; };
C0A100022B10000100A10001 /* Lifecycle+AsyncSequence.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0A100042B10000100A10001 /* Lifecycle+AsyncSequence.swift */; };
C0A100072B10000200A10001 /* AsyncSequence+RIBs.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0A100092B10000200A10001 /* AsyncSequence+RIBs.swift */; };
C0A100082B10000200A10001 /* Task+RIBs.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0A1000A2B10000200A10001 /* Task+RIBs.swift */; };
C0A100062B10000100A10001 /* AsyncStreamTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = C0A100052B10000100A10001 /* AsyncStreamTests.swift */; };
/* End PBXBuildFile section */

/* Begin PBXContainerItemProxy section */
Expand Down Expand Up @@ -75,6 +80,11 @@
AF9966B11FC40D7E00CAEAA2 /* RxSwift.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = RxSwift.framework; path = ../Carthage/Build/iOS/RxSwift.framework; sourceTree = "<group>"; };
AFB7D4041FC81D6100045D2B /* LaunchRouterTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LaunchRouterTests.swift; sourceTree = "<group>"; };
BF5FC0F022808377004235F1 /* RxRelay.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = RxRelay.framework; path = ../Carthage/Build/iOS/RxRelay.framework; sourceTree = "<group>"; };
C0A100032B10000100A10001 /* Observable+AsyncSequence.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Observable+AsyncSequence.swift"; sourceTree = "<group>"; };
C0A100042B10000100A10001 /* Lifecycle+AsyncSequence.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Lifecycle+AsyncSequence.swift"; sourceTree = "<group>"; };
C0A100052B10000100A10001 /* AsyncStreamTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AsyncStreamTests.swift; sourceTree = "<group>"; };
C0A100092B10000200A10001 /* AsyncSequence+RIBs.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "AsyncSequence+RIBs.swift"; sourceTree = "<group>"; };
C0A1000A2B10000200A10001 /* Task+RIBs.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Task+RIBs.swift"; sourceTree = "<group>"; };
E8E789432378AD000043E59E /* Package.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = Package.swift; path = ../Package.swift; sourceTree = SOURCE_ROOT; };
/* End PBXFileReference section */

Expand Down Expand Up @@ -110,6 +120,7 @@
413177271F8EEFEF005F08F0 /* Router.swift */,
413177241F8EEFEF005F08F0 /* ViewableRouter.swift */,
413177281F8EEFEF005F08F0 /* ViewControllable.swift */,
C0A100002B10000100A10001 /* Concurrency */,
418C17551F97DB0E003C03F7 /* DI */,
4131773B1F8EF981005F08F0 /* Extensions */,
413177361F8EF70A005F08F0 /* LeakDetector */,
Expand All @@ -119,6 +130,17 @@
path = Classes;
sourceTree = "<group>";
};
C0A100002B10000100A10001 /* Concurrency */ = {
isa = PBXGroup;
children = (
C0A100092B10000200A10001 /* AsyncSequence+RIBs.swift */,
C0A100042B10000100A10001 /* Lifecycle+AsyncSequence.swift */,
C0A100032B10000100A10001 /* Observable+AsyncSequence.swift */,
C0A1000A2B10000200A10001 /* Task+RIBs.swift */,
);
path = Concurrency;
sourceTree = "<group>";
};
413177201F8EEFEF005F08F0 /* Workflow */ = {
isa = PBXGroup;
children = (
Expand Down Expand Up @@ -195,6 +217,7 @@
isa = PBXGroup;
children = (
8B9882F21F86E1CF00ABE009 /* Info.plist */,
C0A100052B10000100A10001 /* AsyncStreamTests.swift */,
AFB7D4041FC81D6100045D2B /* LaunchRouterTests.swift */,
AF90B40B1FBA157700920384 /* Mocks.swift */,
AF90B4091FBA14DB00920384 /* RouterTests.swift */,
Expand Down Expand Up @@ -382,6 +405,8 @@
isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647;
files = (
C0A100072B10000200A10001 /* AsyncSequence+RIBs.swift in Sources */,
C0A100022B10000100A10001 /* Lifecycle+AsyncSequence.swift in Sources */,
4131773A1F8EF711005F08F0 /* LeakDetector.swift in Sources */,
418C175C1F97F19F003C03F7 /* Component.swift in Sources */,
4131773D1F8EF98A005F08F0 /* Foundation+Extensions.swift in Sources */,
Expand All @@ -392,6 +417,8 @@
4131772D1F8EF5FF005F08F0 /* Interactor.swift in Sources */,
413177321F8EF5FF005F08F0 /* ViewableRouter.swift in Sources */,
413177351F8EF605005F08F0 /* Workflow.swift in Sources */,
C0A100012B10000100A10001 /* Observable+AsyncSequence.swift in Sources */,
C0A100082B10000200A10001 /* Task+RIBs.swift in Sources */,
4131772F1F8EF5FF005F08F0 /* PresentableInteractor.swift in Sources */,
4131772C1F8EF5FF005F08F0 /* Builder.swift in Sources */,
413177331F8EF5FF005F08F0 /* ViewControllable.swift in Sources */,
Expand All @@ -404,6 +431,7 @@
isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647;
files = (
C0A100062B10000100A10001 /* AsyncStreamTests.swift in Sources */,
AFB7D4031FC81C8F00045D2B /* Foundation+ExtensionsTests.swift in Sources */,
AF90B4111FBA185E00920384 /* ComponentTests.swift in Sources */,
AFB7D4051FC81D6100045D2B /* LaunchRouterTests.swift in Sources */,
Expand Down
73 changes: 73 additions & 0 deletions RIBs/Classes/Concurrency/AsyncSequence+RIBs.swift
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@@ -0,0 +1,73 @@
//
// Copyright (c) 2017. Uber Technologies
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import AsyncAlgorithms
import RxSwift

/// A type-erased async sequence used to preserve element type information without requiring typed
/// `AsyncSequence` availability.
public struct AnyAsyncSequence<Element>: AsyncSequence {

public struct AsyncIterator: AsyncIteratorProtocol {

private var nextElement: () async throws -> Element?

fileprivate init<Iterator: AsyncIteratorProtocol>(_ iterator: Iterator) where Iterator.Element == Element {
var iterator = iterator
nextElement = {
try await iterator.next()
}
}

public mutating func next() async throws -> Element? {
return try await nextElement()
}
}

private let makeIterator: () -> AsyncIterator

public init<Sequence: AsyncSequence>(_ sequence: Sequence) where Sequence.Element == Element {
makeIterator = {
AsyncIterator(sequence.makeAsyncIterator())
}
}

public func makeAsyncIterator() -> AsyncIterator {
return makeIterator()
}
}

public extension AsyncSequence {

/// Confines the async sequence's elements to the given interactor scope.
///
/// Elements are only yielded while the interactor scope is active. Values emitted while inactive are ignored,
/// except for the latest value that can be emitted when the scope becomes active again.
///
/// - parameter interactorScope: The interactor scope whose activeness this async sequence is confined to.
/// - returns: The async sequence confined to this interactor's activeness lifecycle.
func confineTo(_ interactorScope: InteractorScope) -> AnyAsyncSequence<Element> {
return AnyAsyncSequence(
combineLatest(interactorScope.isActiveStream.values, self)
.filter { isActive, _ in
isActive
}
.map { _, element in
element
}
)
}
}
47 changes: 47 additions & 0 deletions RIBs/Classes/Concurrency/Lifecycle+AsyncSequence.swift
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@@ -0,0 +1,47 @@
//
// Copyright (c) 2017. Uber Technologies
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

public extension InteractorScope {

/// The lifecycle of this interactor exposed as an async stream.
var isActiveSequence: AsyncStream<Bool> {
return isActiveStream.asAsyncStream(bufferingPolicy: .bufferingNewest(1))
}
}

public extension RouterScope {

/// The lifecycle events of this router exposed as an async stream.
var lifecycleSequence: AsyncStream<RouterLifecycle> {
return lifecycle.asAsyncStream()
}
}

public extension Working {

/// The lifecycle of this worker exposed as an async stream.
var isStartedSequence: AsyncStream<Bool> {
return isStartedStream.asAsyncStream(bufferingPolicy: .bufferingNewest(1))
}
}

public extension LeakDetector {

/// The leak detection status exposed as an async stream.
var statusSequence: AsyncStream<LeakDetectionStatus> {
return status.asAsyncStream(bufferingPolicy: .bufferingNewest(1))
}
}
70 changes: 70 additions & 0 deletions RIBs/Classes/Concurrency/Observable+AsyncSequence.swift
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//
// Copyright (c) 2017. Uber Technologies
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import RxSwift

public extension ObservableType {

/// Convert this observable into an async stream.
///
/// The underlying Rx subscription is disposed when the async stream is terminated.
func asAsyncStream(
bufferingPolicy: AsyncStream<Element>.Continuation.BufferingPolicy = .unbounded
) -> AsyncStream<Element> {
return AsyncStream(Element.self, bufferingPolicy: bufferingPolicy) { continuation in
let disposable = subscribe(
onNext: { element in
continuation.yield(element)
},
onError: { _ in
continuation.finish()
},
onCompleted: {
continuation.finish()
}
)

continuation.onTermination = { _ in
disposable.dispose()
}
}
}

/// Convert this observable into an async throwing stream.
///
/// The underlying Rx subscription is disposed when the async stream is terminated.
func asAsyncThrowingStream(
bufferingPolicy: AsyncThrowingStream<Element, Error>.Continuation.BufferingPolicy = .unbounded
) -> AsyncThrowingStream<Element, Error> {
return AsyncThrowingStream(Element.self, bufferingPolicy: bufferingPolicy) { continuation in
let disposable = subscribe(
onNext: { element in
continuation.yield(element)
},
onError: { error in
continuation.finish(throwing: error)
},
onCompleted: {
continuation.finish()
}
)

continuation.onTermination = { _ in
disposable.dispose()
}
}
}
}
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