Raise minimum supported Swift version from 5.4 to 5.5

Motivation:

SwiftNIO periodically drops support for older Swift versions. Now that
5.7 has been released, 5.4 will be dropped.

Modifications:

- Remove 5.4 specific Package.swift and docker-compose
- Update the 5.7 docker-compose to use the released 5.7 and move from
  focal (2004) to jammy (2204)
- Update docs

Results:

Minimum Swift version is 5.5

Package.swift

@@ -119,7 +119,7 @@ let package = Package(
         .library(name: "NIOHTTPCompression", targets: ["NIOHTTPCompression"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-nio.git", from: "2.34.0"),
+        .package(url: "https://github.com/apple/swift-nio.git", from: "2.42.0"),
         .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
     ],
     targets: targets

Package@swift-5.4.swift

@@ -1,125 +0,0 @@
-// swift-tools-version:5.4
-//===----------------------------------------------------------------------===//
-//
-// This source file is part of the SwiftNIO open source project
-//
-// Copyright (c) 2017-2022 Apple Inc. and the SwiftNIO project authors
-// Licensed under Apache License v2.0
-//
-// See LICENSE.txt for license information
-// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
-//
-// SPDX-License-Identifier: Apache-2.0
-//
-//===----------------------------------------------------------------------===//
-
-import PackageDescription
-
-var targets: [PackageDescription.Target] = [
-    .target(
-        name: "NIOExtras",
-        dependencies: [
-            .product(name: "NIO", package: "swift-nio"),
-            .product(name: "NIOCore", package: "swift-nio"),
-        ]),
-    .target(
-        name: "NIOHTTPCompression",
-        dependencies: [
-            "CNIOExtrasZlib",
-            .product(name: "NIO", package: "swift-nio"),
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
-    .executableTarget(
-        name: "HTTPServerWithQuiescingDemo",
-        dependencies: [
-            "NIOExtras",
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOPosix", package: "swift-nio"),
-            .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
-    .executableTarget(
-        name: "NIOWritePCAPDemo",
-        dependencies: [
-            "NIOExtras",
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOPosix", package: "swift-nio"),
-            .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
-    .executableTarget(
-        name: "NIOWritePartialPCAPDemo",
-        dependencies: [
-            "NIOExtras",
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOPosix", package: "swift-nio"),
-            .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
-    .executableTarget(
-        name: "NIOExtrasPerformanceTester",
-        dependencies: [
-            "NIOExtras",
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOPosix", package: "swift-nio"),
-            .product(name: "NIOEmbedded", package: "swift-nio"),
-            .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
-    .target(
-        name: "NIOSOCKS",
-        dependencies: [
-            .product(name: "NIO", package: "swift-nio"),
-            .product(name: "NIOCore", package: "swift-nio"),
-        ]),
-    .executableTarget(
-        name: "NIOSOCKSClient",
-        dependencies: [
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOPosix", package: "swift-nio"),
-            "NIOSOCKS"
-        ]),
-    .target(
-        name: "CNIOExtrasZlib",
-        dependencies: [],
-        linkerSettings: [
-            .linkedLibrary("z")
-        ]),
-    .testTarget(
-        name: "NIOExtrasTests",
-        dependencies: [
-            "NIOExtras",
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOEmbedded", package: "swift-nio"),
-            .product(name: "NIOPosix", package: "swift-nio"),
-            .product(name: "NIOTestUtils", package: "swift-nio"),
-            .product(name: "NIOConcurrencyHelpers", package: "swift-nio"),
-        ]),
-    .testTarget(
-        name: "NIOHTTPCompressionTests",
-        dependencies: [
-            "CNIOExtrasZlib",
-            "NIOHTTPCompression",
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOEmbedded", package: "swift-nio"),
-            .product(name: "NIOHTTP1", package: "swift-nio"),
-            .product(name: "NIOConcurrencyHelpers", package: "swift-nio"),
-        ]),
-    .testTarget(
-        name: "NIOSOCKSTests",
-        dependencies: [
-            "NIOSOCKS",
-            .product(name: "NIOCore", package: "swift-nio"),
-            .product(name: "NIOEmbedded", package: "swift-nio"),
-        ])
-]
-
-let package = Package(
-    name: "swift-nio-extras",
-    products: [
-        .library(name: "NIOExtras", targets: ["NIOExtras"]),
-        .library(name: "NIOSOCKS", targets: ["NIOSOCKS"]),
-        .library(name: "NIOHTTPCompression", targets: ["NIOHTTPCompression"]),
-    ],
-    dependencies: [
-        .package(url: "https://github.com/apple/swift-nio.git", from: "2.34.0"),
-    ],
-    targets: targets
-)

README.md

@@ -14,7 +14,7 @@ All code will go through code review like in the other repositories related to t
 `swift-nio-extras` part of the SwiftNIO 2 family of repositories and depends on the following:
 
 - [`swift-nio`](https://github.com/apple/swift-nio), version 2.30.0 or better.
-- Swift 5.4.
+- Swift 5.5.
 - `zlib` and its development headers installed on the system. But don't worry, you'll find `zlib` on pretty much any UNIX system that can compile any sort of code.
 
 To depend on `swift-nio-extras`, put the following in the `dependencies` of your `Package.swift`:
@@ -25,7 +25,14 @@ To depend on `swift-nio-extras`, put the following in the `dependencies` of your
 
 ### Support for older Swift versions
 
-Earlier versions of SwiftNIO (2.39.x and lower) and SwiftNIOExtras (1.10.x and lower) supported Swift 5.2 and 5.3, SwiftNIO (2.29.x and lower) and SwiftNIOExtras (1.9.x and lower) supported Swift 5.0 and 5.1. 
+The most recent versions of SwiftNIO Extras support Swift 5.5 and newer. The minimum Swift version supported by SwiftNIO Extras releases are detailed below:
+
+SwiftNIO Extras     | Minimum Swift Version
+--------------------|----------------------
+`1.0.0 ..< 1.10.0`  | 5.0
+`1.10.0 ..< 1.11.0` | 5.2
+`1.11.0 ..< 1.14.0` | 5.4
+`1.14.0 ...`        | 5.5
 
 On the [`nio-extras-0.1`](https://github.com/apple/swift-nio-extras/tree/nio-extras-0.1) branch, you can find the `swift-nio-extras` version for the SwiftNIO 1 family. It requires Swift 4.1 or better.
 

Tests/NIOHTTPCompressionTests/HTTPResponseCompressorTest.swift

@@ -546,7 +546,7 @@ class HTTPResponseCompressorTest: XCTestCase {
         XCTAssertNoThrow(try channel.pipeline.removeHandler(name: "compressor").wait())
         XCTAssertNoThrow(try writePromise.futureResult.wait())
     }
-    
+
     func testChunkedGzipResponseProducesCorrectNumberOfWrites() throws {
         let channel = try compressionChannel()
         try sendRequest(acceptEncoding: "gzip", channel: channel)
@@ -558,14 +558,14 @@ class HTTPResponseCompressorTest: XCTestCase {
         channel.write(NIOAny(HTTPServerResponsePart.head(head)), promise: nil)
         channel.writeAndFlush(NIOAny(HTTPServerResponsePart.body(.byteBuffer(bodyBuffer))), promise: nil)
         channel.writeAndFlush(NIOAny(HTTPServerResponsePart.end(nil)), promise: finalPromise)
-        
+
         try finalPromise.futureResult.wait()
-        
+
         var writeCount = 0
         while try channel.readOutbound(as: ByteBuffer.self) != nil {
             writeCount += 1
         }
-        
+
         // Expected number of emitted writes in the chunked response is 8:
         //   1. HTTP response header
         //   2. First chunk length
@@ -673,7 +673,7 @@ extension EventLoopFuture {
             }
             return fulfilled
         } else {
-            let lock = Lock()
+            let lock = NIOLock()
             let group = DispatchGroup()
             var fulfilled = false // protected by lock
 

docker/Dockerfile

@@ -1,4 +1,4 @@
-ARG swift_version=5.4
+ARG swift_version=5.7
 ARG ubuntu_version=focal
 ARG base_image=swift:$swift_version-$ubuntu_version
 FROM $base_image

docker/docker-compose.1804.54.yaml

@@ -1,18 +0,0 @@
-version: "3"
-
-services:
-
-  runtime-setup:
-    image: swift-nio-extras:18.04-5.4
-    build:
-      args:
-        base_image: "swift:5.4-bionic"
-        ubuntu_version: "bionic"
-        swift_version: "5.4"
-
-  test:
-    image: swift-nio-extras:18.04-5.4
-    command: /bin/bash -xcl "cat /etc/lsb-release && swift -version && swift test -Xswiftc -warnings-as-errors $${SANITIZER_ARG-}"
-
-  shell:
-    image: swift-nio-extras:18.04-5.4

docker/docker-compose.2004.57.yaml

@@ -1,15 +0,0 @@
-version: "3"
-
-services:
-
-  runtime-setup:
-    image: swift-nio-extras:20.04-5.7
-    build:
-      args:
-        base_image: "swiftlang/swift:nightly-5.7-focal"
-
-  test:
-    image: swift-nio-extras:20.04-5.7
-
-  shell:
-    image: swift-nio-extras:20.04-5.7

docker/docker-compose.2204.57.yaml

@@ -0,0 +1,16 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-nio-extras:22.04-5.7
+    build:
+      args:
+        ubuntu_version: "jammy"
+        swift_version: "5.7"
+
+  test:
+    image: swift-nio-extras:22.04-5.7
+
+  shell:
+    image: swift-nio-extras:22.04-5.7