Remove support for Swift 5.0 and 5.1 (#138)

Changes made:

Removed CI config for 5.0 ad 5.1
Changed 5.2 to be based on 16.04 so we have some coverage there
Converted Package.swift to the latest syntax
Added a description to supported Swift versions in the README

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.2
 //===----------------------------------------------------------------------===//
 //
 // This source file is part of the SwiftNIO open source project
@@ -16,22 +16,81 @@
 import PackageDescription
 
 var targets: [PackageDescription.Target] = [
-    .target(name: "NIOExtras", dependencies: ["NIO"]),
-    .target(name: "NIOHTTPCompression", dependencies: ["NIO", "NIOHTTP1", "CNIOExtrasZlib"]),
-    .target(name: "HTTPServerWithQuiescingDemo", dependencies: ["NIOExtras", "NIOHTTP1"]),
-    .target(name: "NIOWritePCAPDemo", dependencies: ["NIO", "NIOExtras", "NIOHTTP1"]),
-    .target(name: "NIOWritePartialPCAPDemo", dependencies: ["NIO", "NIOExtras", "NIOHTTP1"]),
-    .target(name: "NIOExtrasPerformanceTester", dependencies: ["NIO", "NIOExtras", "NIOHTTP1"]),
-    .target(name: "NIOSOCKS", dependencies: ["NIO"]),
-    .target(name: "NIOSOCKSClient", dependencies: ["NIO", "NIOSOCKS"]),
-    .target(name: "CNIOExtrasZlib",
-            dependencies: [],
-            linkerSettings: [
-                .linkedLibrary("z")
-            ]),
-    .testTarget(name: "NIOExtrasTests", dependencies: ["NIOExtras", "NIO", "NIOTestUtils", "NIOConcurrencyHelpers"]),
-    .testTarget(name: "NIOHTTPCompressionTests", dependencies: ["NIOHTTPCompression"]),
-    .testTarget(name: "NIOSOCKSTests", dependencies: ["NIO", "NIOSOCKS"])
+    .target(
+        name: "NIOExtras",
+        dependencies: [
+            .product(name: "NIO", package: "swift-nio")
+        ]),
+    .target(
+        name: "NIOHTTPCompression",
+        dependencies: [
+            "CNIOExtrasZlib",
+            .product(name: "NIO", package: "swift-nio"),
+            .product(name: "NIOHTTP1", package: "swift-nio"),
+        ]),
+    .target(
+        name: "HTTPServerWithQuiescingDemo",
+        dependencies: [
+            "NIOExtras",
+            .product(name: "NIOHTTP1", package: "swift-nio"),
+        ]),
+    .target(
+        name: "NIOWritePCAPDemo",
+        dependencies: [
+            "NIOExtras",
+            .product(name: "NIO", package: "swift-nio"),
+            .product(name: "NIOHTTP1", package: "swift-nio"),
+        ]),
+    .target(
+        name: "NIOWritePartialPCAPDemo",
+        dependencies: [
+            "NIOExtras",
+            .product(name: "NIO", package: "swift-nio"),
+            .product(name: "NIOHTTP1", package: "swift-nio"),
+        ]),
+    .target(
+        name: "NIOExtrasPerformanceTester",
+        dependencies: [
+            "NIOExtras",
+            .product(name: "NIO", package: "swift-nio"),
+            .product(name: "NIOHTTP1", package: "swift-nio"),
+        ]),
+    .target(
+        name: "NIOSOCKS",
+        dependencies: [
+            .product(name: "NIO", package: "swift-nio")
+        ]),
+    .target(
+        name: "NIOSOCKSClient",
+        dependencies: [
+            .product(name: "NIO", package: "swift-nio"),
+            "NIOSOCKS"
+        ]),
+    .target(
+        name: "CNIOExtrasZlib",
+        dependencies: [],
+        linkerSettings: [
+            .linkedLibrary("z")
+        ]),
+    .testTarget(
+        name: "NIOExtrasTests",
+        dependencies: [
+            "NIOExtras",
+            .product(name: "NIO", package: "swift-nio"),
+            .product(name: "NIOTestUtils", package: "swift-nio"),
+            .product(name: "NIOConcurrencyHelpers", package: "swift-nio"),
+        ]),
+    .testTarget(
+        name: "NIOHTTPCompressionTests",
+        dependencies: [
+            "NIOHTTPCompression"
+        ]),
+    .testTarget(
+        name: "NIOSOCKSTests",
+        dependencies: [
+            "NIOSOCKS",
+            .product(name: "NIO", package: "swift-nio"),
+        ])
 ]
 
 let package = Package(

README.md

@@ -13,8 +13,8 @@ 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 2.0.0 or better.
-- Swift 5.0.
+- [`swift-nio`](https://github.com/apple/swift-nio), version 2.29.0 or better.
+- Swift 5.2.
 - `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`:
@@ -25,6 +25,8 @@ To depend on `swift-nio-extras`, put the following in the `dependencies` of your
 
 ### Support for older Swift versions
 
+Earlier versions of SwiftNIO (2.29.x and lower) and SwiftNIOExtras (1.9.x and lower) supported Swift 5.0 and 5.1. 
+
 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.
 
 ## Current Contents

docker/Dockerfile

@@ -1,5 +1,5 @@
-ARG swift_version=5.0
-ARG ubuntu_version=bionic
+ARG swift_version=5.2
+ARG ubuntu_version=focal
 ARG base_image=swift:$swift_version-$ubuntu_version
 FROM $base_image
 # needed to do again after FROM due to docker limitation

docker/docker-compose.1604.52.yaml

@@ -3,16 +3,16 @@ version: "3"
 services:
 
   runtime-setup:
-    image: swift-nio-extras:16.04-5.1
+    image: swift-nio-extras:16.04-5.2
     build:
       args:
         ubuntu_version: "xenial"
-        swift_version: "5.1"
+        swift_version: "5.2"
 
   test:
-    image: swift-nio-extras:16.04-5.1
+    image: swift-nio-extras:16.04-5.2
     environment:
       - SANITIZER_ARG=--sanitize=thread
 
   shell:
-    image: swift-nio-extras:16.04-5.1
+    image: swift-nio-extras:16.04-5.2

docker/docker-compose.1804.50.yaml

@@ -1,16 +0,0 @@
-version: "3"
-
-services:
-
-  runtime-setup:
-    image: swift-nio-extras:18.04-5.0
-    build:
-      args:
-        ubuntu_version: "bionic"
-        swift_version: "5.0"
-
-  test:
-    image: swift-nio-extras:18.04-5.0
-
-  shell:
-    image: swift-nio-extras:18.04-5.0

docker/docker-compose.1804.52.yaml

@@ -1,16 +0,0 @@
-version: "3"
-
-services:
-
-  runtime-setup:
-    image: swift-nio-extras:18.04-5.2
-    build:
-      args:
-        ubuntu_version: "bionic"
-        swift_version: "5.2"
-
-  test:
-    image: swift-nio-extras:18.04-5.2
-
-  shell:
-    image: swift-nio-extras:18.04-5.2

scripts/check_no_api_breakages.sh

@@ -109,7 +109,7 @@ for old_tag in "$@"; do
                 > "$report" 2>&1
         fi
 
-        if ! shasum "$report" | grep -q cefc4ee5bb7bcdb7cb5a7747efa178dab3c794d5; then
+        if ! shasum "$report" | grep -q afd2a1b542b33273920d65821deddc653063c700; then
             echo ERROR
             echo >&2 "=============================="
             echo >&2 "ERROR: public API change in $f"