Bump minimum Swift version to 5.7

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.6
+// swift-tools-version:5.7
 //===----------------------------------------------------------------------===//
 //
 // This source file is part of the SwiftNIO open source project

README.md

@@ -24,15 +24,16 @@ To depend on `swift-nio-http2`, put the following in the `dependencies` of your
 
     .package(url: "https://github.com/apple/swift-nio-http2.git", from: "1.19.2"),
 
-The most recent versions of SwiftNIO HTTP/2 support Swift 5.6 and newer. The minimum Swift version supported for SwiftNIO HTTP/2 releases are detailed below:
+The most recent versions of SwiftNIO HTTP/2 support Swift 5.7 and newer. The minimum Swift version supported for SwiftNIO HTTP/2 releases are detailed below:
 
 SwiftNIO HTTP/2     | Minimum Swift Version
 --------------------|----------------------
 `1.0.0 ..< 1.18.0`  | 5.0
 `1.18.0 ..< 1.21.0` | 5.2
 `1.21.0 ..< 1.23.0` | 5.4
 `1.24.0 ..< 1.27.0` | 5.5.2
-`1.27.0 ...`        | 5.6
+`1.27.0 ..< 1.29.0` | 5.6
+`1.29.0 ...`        | 5.7
 
 
 ### `swift-nio-http2` 0.x

Sources/NIOHTTP2/DOSHeuristics.swift

@@ -30,28 +30,13 @@ struct DOSHeuristics<DeadlineClock: NIODeadlineClock> {
 
     private var resetFrameRateControlStateMachine: HTTP2ResetFrameRateControlStateMachine
 
-#if swift(>=5.7)
     internal init(maximumSequentialEmptyDataFrames: Int, maximumResetFrameCount: Int, resetFrameCounterWindow: TimeAmount, clock: DeadlineClock = RealNIODeadlineClock()) {
         precondition(maximumSequentialEmptyDataFrames >= 0,
                      "maximum sequential empty data frames must be positive, got \(maximumSequentialEmptyDataFrames)")
         self.maximumSequentialEmptyDataFrames = maximumSequentialEmptyDataFrames
         self.receivedEmptyDataFrames = 0
         self.resetFrameRateControlStateMachine = .init(countThreshold: maximumResetFrameCount, timeWindow: resetFrameCounterWindow, clock: clock)
     }
-#else
-    internal init(maximumSequentialEmptyDataFrames: Int, maximumResetFrameCount: Int, resetFrameCounterWindow: TimeAmount, clock: DeadlineClock) {
-        precondition(maximumSequentialEmptyDataFrames >= 0,
-                     "maximum sequential empty data frames must be positive, got \(maximumSequentialEmptyDataFrames)")
-        self.maximumSequentialEmptyDataFrames = maximumSequentialEmptyDataFrames
-        self.receivedEmptyDataFrames = 0
-
-        self.resetFrameRateControlStateMachine = .init(countThreshold: maximumResetFrameCount, timeWindow: resetFrameCounterWindow, clock: clock)
-    }
-
-    internal init(maximumSequentialEmptyDataFrames: Int, maximumResetFrameCount: Int, resetFrameCounterWindow: TimeAmount) where DeadlineClock == RealNIODeadlineClock {
-        self.init(maximumSequentialEmptyDataFrames: maximumSequentialEmptyDataFrames, maximumResetFrameCount: maximumResetFrameCount, resetFrameCounterWindow: resetFrameCounterWindow, clock: RealNIODeadlineClock())
-    }
-#endif
 }
 
 
@@ -104,23 +89,13 @@ extension DOSHeuristics {
         private var resetTimestamps: Deque<NIODeadline>
         private var _state: ResetFrameRateControlState = .noneReceived
 
-#if swift(>=5.7)
         init(countThreshold: Int, timeWindow: TimeAmount, clock: DeadlineClock = RealNIODeadlineClock()) {
             self.countThreshold = countThreshold
             self.timeWindow = timeWindow
             self.clock = clock
 
             self.resetTimestamps = .init(minimumCapacity: self.countThreshold)
         }
-#else
-        init(countThreshold: Int, timeWindow: TimeAmount, clock: DeadlineClock) {
-            self.countThreshold = countThreshold
-            self.timeWindow = timeWindow
-            self.clock = clock
-
-            self.resetTimestamps = .init(minimumCapacity: self.countThreshold)
-        }
-#endif
 
         mutating func resetReceived() -> ResetFrameRateControlState {
             self.garbageCollect()

Sources/NIOHTTP2/HTTP2ChannelHandler.swift

@@ -1033,17 +1033,10 @@ extension NIOHTTP2Handler {
 
 
 extension NIOHTTP2Handler {
-#if swift(>=5.7)
     /// The type of all `inboundStreamInitializer` callbacks which do not need to return data.
     public typealias StreamInitializer = NIOChannelInitializer
     /// The type of NIO Channel initializer callbacks which need to return untyped data.
     internal typealias StreamInitializerWithAnyOutput = @Sendable (Channel) -> EventLoopFuture<any Sendable>
-#else
-    /// The type of all `inboundStreamInitializer` callbacks which need to return data.
-    public typealias StreamInitializer = NIOChannelInitializer
-    /// The type of NIO Channel initializer callbacks which need to return untyped data.
-    internal typealias StreamInitializerWithAnyOutput = (Channel) -> EventLoopFuture<any Sendable>
-#endif
 
     /// Creates a new ``NIOHTTP2Handler`` with a local multiplexer. (i.e. using
     /// ``StreamMultiplexer``.)

Sources/NIOHTTP2/HTTP2PipelineHelpers.swift

@@ -32,17 +32,10 @@ import NIOTLS
 /// Configuring for servers is very similar.
 public let NIOHTTP2SupportedALPNProtocols = ["h2", "http/1.1"]
 
-#if swift(>=5.7)
 /// The type of NIO Channel initializer callbacks which do not need to return data.
 public typealias NIOChannelInitializer = @Sendable (Channel) -> EventLoopFuture<Void>
 /// The type of NIO Channel initializer callbacks which need to return data.
 public typealias NIOChannelInitializerWithOutput<Output> = @Sendable (Channel) -> EventLoopFuture<Output>
-#else
-/// The type of NIO Channel initializer callbacks which do not need to return data.
-public typealias NIOChannelInitializer = (Channel) -> EventLoopFuture<Void>
-/// The type of NIO Channel initializer callbacks which need to return data.
-public typealias NIOChannelInitializerWithOutput<Output> = (Channel) -> EventLoopFuture<Output>
-#endif
 
 extension ChannelPipeline {
     /// Configures a channel pipeline to perform a HTTP/2 secure upgrade.

dev/update-alloc-limits-to-last-completed-ci-build

@@ -22,7 +22,7 @@ url_prefix=${1-"https://ci.swiftserver.group/job/swift-nio-http2-2-"}
 target_repo=${2-"$here/.."}
 tmpdir=$(mktemp -d /tmp/.last-build_XXXXXX)
 
-for f in swift56 swift57 swift58 swift59 nightly; do
+for f in swift57 swift58 swift59 swift510 nightly; do
     echo "$f"
     url="$url_prefix$f-prb/lastCompletedBuild/consoleFull"
     stripped=${f#"swift"}

docker/docker-compose.2004.56.yaml → docker/docker-compose.2204.510.yaml

@@ -3,30 +3,29 @@ version: "3"
 services:
 
   runtime-setup:
-    image: swift-nio-http2:20.04-5.6
+    image: swift-nio-http2:22.04-5.10
     build:
       args:
-        ubuntu_version: "focal"
-        swift_version: "5.6"
+        base_image: "swiftlang/swift:nightly-5.10-jammy"
         h2spec_version: "2.2.1"
 
   unit-tests:
-    image: swift-nio-http2:20.04-5.6
+    image: swift-nio-http2:22.04-5.10
 
   integration-tests:
-    image: swift-nio-http2:20.04-5.6
+    image: swift-nio-http2:22.04-5.10
 
   performance-test:
-    image: swift-nio-http2:20.04-5.6
+    image: swift-nio-http2:22.04-5.10
 
   h2spec:
-    image: swift-nio-http2:20.04-5.6
+    image: swift-nio-http2:22.04-5.10
 
   documentation-check:
-    image: swift-nio-http2:20.04-5.6
+    image: swift-nio-http2:22.04-5.10
 
   test:
-    image: swift-nio-http2:20.04-5.6
+    image: swift-nio-http2:22.04-5.10
     environment:
       - MAX_ALLOCS_ALLOWED_1k_requests_inline_interleaved=35150
       - MAX_ALLOCS_ALLOWED_1k_requests_inline_noninterleaved=34100
@@ -47,6 +46,7 @@ services:
       - MAX_ALLOCS_ALLOWED_hpack_decoding=5050
       - MAX_ALLOCS_ALLOWED_stream_teardown_100_concurrent=293050
       - MAX_ALLOCS_ALLOWED_stream_teardown_100_concurrent_inline=291750
+      - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
 
   shell:
-    image: swift-nio-http2:20.04-5.6
+    image: swift-nio-http2:22.04-5.10

docker/docker-compose.2204.59.yaml

@@ -6,7 +6,8 @@ services:
     image: swift-nio-http2:22.04-5.9
     build:
       args:
-        base_image: "swiftlang/swift:nightly-5.9-jammy"
+        ubuntu_version: "jammy"
+        swift_version: "5.9"
         h2spec_version: "2.2.1"
 
   unit-tests: