[CI] Adopt GitHub actions

# Motivation

We want to switch our CI to GitHub actions.

# Modification

This PR sets up the reusable workflows from NIO.

# Result

More modern CI.

.editorconfig

@@ -0,0 +1,13 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+
+[*.yml]
+indent_style = space
+indent_size = 2

.github/release.yml

@@ -0,0 +1,14 @@
+changelog:
+  categories:
+    - title: SemVer Major
+      labels:
+        - ⚠️ semver/major
+    - title: SemVer Minor
+      labels:
+        - semver/minor
+    - title: SemVer Patch
+      labels:
+        - semver/patch
+    - title: Other Changes
+      labels:
+        - semver/none

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: Main
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  unit-tests:
+    name: Unit tests
+    uses: ./.github/workflows/unit_tests.yml
+    with:
+      linux_5_8_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_nightly_6_0_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_nightly_main_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+
+  cxx-interop:
+    name: Cxx interop
+    uses: ./.github/workflows/cxx_interop.yml

.github/workflows/pull_request.yml

@@ -0,0 +1,26 @@
+name: PR
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  soundness:
+    name: Soundness
+    uses: apple/swift-nio/.github/workflows/soundness.yml@main
+    with:
+      license_header_check_project_name: "SwiftServiceLifecycle"
+
+  unit-tests:
+    name: Unit tests
+    uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+    with:
+      linux_5_8_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_nightly_6_0_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_nightly_main_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+
+  swift-6-language-mode:
+    name: Swift 6 Language Mode
+    uses: apple/swift-nio/.github/workflows/swift_6_language_mode.yml@main

.github/workflows/pull_request_label.yml

@@ -0,0 +1,18 @@
+name: PR label
+
+on:
+  pull_request:
+    types: [labeled, unlabeled, opened, reopened, synchronize]
+
+jobs:
+  semver-label-check:
+    name: Semantic Version label check
+    runs-on: ubuntu-latest
+    timeout-minutes: 1
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Check for Semantic Version label
+        uses: apple/swift-nio/.github/actions/pull_request_semver_label_checker@main

.github/workflows/scheduled.yml

@@ -0,0 +1,16 @@
+name: Scheduled
+
+on:
+  schedule:
+    - cron: "0 8,20 * * *"
+
+jobs:
+  unit-tests:
+    name: Unit tests
+    uses: ./.github/workflows/unit_tests.yml
+    with:
+      linux_5_8_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_nightly_6_0_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_nightly_main_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"

.licenseignore

@@ -0,0 +1,39 @@
+.gitignore
+**/.gitignore
+.licenseignore
+.gitattributes
+.mailfilter
+.mailmap
+.spi.yml
+.swift-format
+.editorconfig
+.github/*
+*.md
+*.txt
+*.yml
+*.yaml
+*.json
+Package.swift
+**/Package.swift
+Package@-*.swift
+**/Package@-*.swift
+Package.resolved
+**/Package.resolved
+Makefile
+*.modulemap
+**/*.modulemap
+**/*.docc/*
+*.xcprivacy
+**/*.xcprivacy
+*.symlink
+**/*.symlink
+Dockerfile
+**/Dockerfile
+Snippets/*
+dev/git.commit.template
+*.crt
+**/*.crt
+*.pem
+**/*.pem
+*.der
+**/*.der

.swift-format

@@ -0,0 +1,58 @@
+{
+  "fileScopedDeclarationPrivacy" : {
+    "accessLevel" : "private"
+  },
+  "indentation" : {
+    "spaces" : 4
+  },
+  "indentConditionalCompilationBlocks" : false,
+  "indentSwitchCaseLabels" : false,
+  "lineBreakAroundMultilineExpressionChainComponents" : false,
+  "lineBreakBeforeControlFlowKeywords" : false,
+  "lineBreakBeforeEachArgument" : true,
+  "lineBreakBeforeEachGenericRequirement" : true,
+  "lineLength" : 120,
+  "maximumBlankLines" : 1,
+  "prioritizeKeepingFunctionOutputTogether" : true,
+  "respectsExistingLineBreaks" : true,
+  "rules" : {
+    "AllPublicDeclarationsHaveDocumentation" : false,
+    "AlwaysUseLowerCamelCase" : false,
+    "AmbiguousTrailingClosureOverload" : true,
+    "BeginDocumentationCommentWithOneLineSummary" : false,
+    "DoNotUseSemicolons" : true,
+    "DontRepeatTypeInStaticProperties" : true,
+    "FileScopedDeclarationPrivacy" : true,
+    "FullyIndirectEnum" : true,
+    "GroupNumericLiterals" : true,
+    "IdentifiersMustBeASCII" : true,
+    "NeverForceUnwrap" : false,
+    "NeverUseForceTry" : false,
+    "NeverUseImplicitlyUnwrappedOptionals" : false,
+    "NoAccessLevelOnExtensionDeclaration" : true,
+    "NoAssignmentInExpressions" : true,
+    "NoBlockComments" : true,
+    "NoCasesWithOnlyFallthrough" : true,
+    "NoEmptyTrailingClosureParentheses" : true,
+    "NoLabelsInCasePatterns" : false,
+    "NoLeadingUnderscores" : false,
+    "NoParensAroundConditions" : true,
+    "NoVoidReturnOnFunctionSignature" : true,
+    "OneCasePerLine" : true,
+    "OneVariableDeclarationPerLine" : true,
+    "OnlyOneTrailingClosureArgument" : true,
+    "OrderedImports" : false,
+    "ReturnVoidInsteadOfEmptyTuple" : true,
+    "UseEarlyExits" : true,
+    "UseLetInEveryBoundCaseVariable" : false,
+    "UseShorthandTypeNames" : true,
+    "UseSingleLinePropertyGetter" : false,
+    "UseSynthesizedInitializer" : false,
+    "UseTripleSlashForDocumentationComments" : true,
+    "UseWhereClausesInForLoops" : false,
+    "ValidateDocumentationComments" : false
+  },
+  "spacesAroundRangeFormationOperators" : false,
+  "tabWidth" : 4,
+  "version" : 1
+}

Package.swift

@@ -28,10 +28,6 @@ let package = Package(
             url: "https://github.com/apple/swift-log.git",
             from: "1.5.2"
         ),
-        .package(
-            url: "https://github.com/apple/swift-docc-plugin",
-            from: "1.0.0"
-        ),
         .package(
             url: "https://github.com/apple/swift-async-algorithms.git",
             from: "1.0.0"
@@ -56,13 +52,13 @@ let package = Package(
         .target(
             name: "ServiceLifecycleTestKit",
             dependencies: [
-                .target(name: "ServiceLifecycle"),
+                .target(name: "ServiceLifecycle")
             ]
         ),
         .target(
             name: "UnixSignals",
             dependencies: [
-                .target(name: "ConcurrencyHelpers"),
+                .target(name: "ConcurrencyHelpers")
             ]
         ),
         .target(
@@ -78,7 +74,7 @@ let package = Package(
         .testTarget(
             name: "UnixSignalsTests",
             dependencies: [
-                .target(name: "UnixSignals"),
+                .target(name: "UnixSignals")
             ]
         ),
     ]

Sources/ServiceLifecycle/AsyncCancelOnGracefulShutdownSequence.swift

@@ -24,7 +24,8 @@ extension AsyncSequence where Self: Sendable, Element: Sendable {
 }
 
 /// An asynchronous sequence that is cancelled once graceful shutdown has triggered.
-public struct AsyncCancelOnGracefulShutdownSequence<Base: AsyncSequence & Sendable>: AsyncSequence, Sendable where Base.Element: Sendable {
+public struct AsyncCancelOnGracefulShutdownSequence<Base: AsyncSequence & Sendable>: AsyncSequence, Sendable
+where Base.Element: Sendable {
     @usableFromInline
     enum _ElementOrGracefulShutdown: Sendable {
         case base(AsyncMapNilSequence<Base>.Element)

Sources/ServiceLifecycle/GracefulShutdown.swift

@@ -115,7 +115,9 @@ enum ValueOrGracefulShutdown<T: Sendable>: Sendable {
 /// Cancels the closure when a graceful shutdown was triggered.
 ///
 /// - Parameter operation: The actual operation.
-public func cancelWhenGracefulShutdown<T: Sendable>(_ operation: @Sendable @escaping () async throws -> T) async rethrows -> T {
+public func cancelWhenGracefulShutdown<T: Sendable>(
+    _ operation: @Sendable @escaping () async throws -> T
+) async rethrows -> T {
     return try await withThrowingTaskGroup(of: ValueOrGracefulShutdown<T>.self) { group in
         group.addTask {
             let value = try await operation()
@@ -163,7 +165,9 @@ public func cancelWhenGracefulShutdown<T: Sendable>(_ operation: @Sendable @esca
 // renamed pattern has been shown to cause compiler crashes in 5.x compilers.
 @available(*, deprecated, message: "renamed to cancelWhenGracefulShutdown")
 #endif
-public func cancelOnGracefulShutdown<T: Sendable>(_ operation: @Sendable @escaping () async throws -> T) async rethrows -> T? {
+public func cancelOnGracefulShutdown<T: Sendable>(
+    _ operation: @Sendable @escaping () async throws -> T
+) async rethrows -> T? {
     return try await cancelWhenGracefulShutdown(operation)
 }
 
@@ -218,11 +222,7 @@ public final class GracefulShutdownManager: @unchecked Sendable {
 
     func registerHandler(_ handler: @Sendable @escaping () -> Void) -> UInt64? {
         return self.state.withLockedValue { state in
-            if state.isShuttingDown {
-                // We are already shutting down so we just run the handler now.
-                handler()
-                return nil
-            } else {
+            guard state.isShuttingDown else {
                 defer {
                     state.handlerCounter += 1
                 }
@@ -231,6 +231,9 @@ public final class GracefulShutdownManager: @unchecked Sendable {
 
                 return handlerID
             }
+            // We are already shutting down so we just run the handler now.
+            handler()
+            return nil
         }
     }