Drop Swift 5.5 (#197)

Motivation Per SwiftNIO's formal version policy, we are ready to drop support for Swift 5.5. Modifications This patch removes the support for 5.5 and all supporting infrastructure. This includes the test generation functionality, which is no longer required, as well as the files generated by that functionality. It updates the dockerfile for 5.8, and it removes all conditional compilation checks that are now definitionally true. Result A nice, clean, 5.6+ codebase
apple · Apr 13, 2023 · 9cdb93e · 9cdb93e
1 parent 78d6cc4
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diff --git a/[email protected] b/[email protected]
diff --git a/README.md b/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 5.5.2
+- Swift 5.6
 - `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`:
@@ -25,14 +25,15 @@ To depend on `swift-nio-extras`, put the following in the `dependencies` of your
 
 ### Support for older Swift versions
 
-The most recent versions of SwiftNIO Extras support Swift 5.5.2 and newer. The minimum Swift version supported by SwiftNIO Extras releases are detailed below:
+The most recent versions of SwiftNIO Extras support Swift 5.6 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 ...`        | 5.5.2
+`1.14.0 ..< 1.19.1` | 5.5.2
+`1.19.0 ...`        | 5.6
 
 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.
 

diff --git a/Sources/NIOExtras/DebugInboundEventsHandler.swift b/Sources/NIOExtras/DebugInboundEventsHandler.swift
@@ -175,7 +175,5 @@ public class DebugInboundEventsHandler: ChannelInboundHandler {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension DebugInboundEventsHandler: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/DebugOutboundEventsHandler.swift b/Sources/NIOExtras/DebugOutboundEventsHandler.swift
@@ -171,7 +171,5 @@ public class DebugOutboundEventsHandler: ChannelOutboundHandler {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension DebugOutboundEventsHandler: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/FixedLengthFrameDecoder.swift b/Sources/NIOExtras/FixedLengthFrameDecoder.swift
@@ -77,7 +77,5 @@ public final class FixedLengthFrameDecoder: ByteToMessageDecoder {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension FixedLengthFrameDecoder: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/JSONRPCFraming+ContentLengthHeader.swift b/Sources/NIOExtras/JSONRPCFraming+ContentLengthHeader.swift
@@ -217,10 +217,8 @@ extension String {
 
 
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension NIOJSONRPCFraming.ContentLengthHeaderFrameDecoder: Sendable {}
 
 @available(*, unavailable)
 extension NIOJSONRPCFraming.ContentLengthHeaderFrameEncoder: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/LengthFieldBasedFrameDecoder.swift b/Sources/NIOExtras/LengthFieldBasedFrameDecoder.swift
@@ -247,7 +247,5 @@ public final class LengthFieldBasedFrameDecoder: ByteToMessageDecoder {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension LengthFieldBasedFrameDecoder: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/LengthFieldPrepender.swift b/Sources/NIOExtras/LengthFieldPrepender.swift
@@ -145,7 +145,5 @@ public final class LengthFieldPrepender: ChannelOutboundHandler {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension LengthFieldPrepender: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/LineBasedFrameDecoder.swift b/Sources/NIOExtras/LineBasedFrameDecoder.swift
@@ -92,7 +92,5 @@ public class LineBasedFrameDecoder: ByteToMessageDecoder {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension LineBasedFrameDecoder: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/PCAPRingBuffer.swift b/Sources/NIOExtras/PCAPRingBuffer.swift
@@ -97,7 +97,5 @@ public class NIOPCAPRingBuffer {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension NIOPCAPRingBuffer: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/RequestResponseHandler.swift b/Sources/NIOExtras/RequestResponseHandler.swift
@@ -120,7 +120,5 @@ public final class RequestResponseHandler<Request, Response>: ChannelDuplexHandl
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension RequestResponseHandler: Sendable {}
-#endif
diff --git a/Sources/NIOExtras/WritePCAPHandler.swift b/Sources/NIOExtras/WritePCAPHandler.swift
@@ -290,10 +290,8 @@ public class NIOWritePCAPHandler: RemovableChannelHandler {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension NIOWritePCAPHandler: Sendable {}
-#endif
 
 extension NIOWritePCAPHandler: ChannelDuplexHandler {
     public typealias InboundIn = ByteBuffer

diff --git a/Sources/NIOHTTPCompression/HTTPRequestCompressor.swift b/Sources/NIOHTTPCompression/HTTPRequestCompressor.swift
@@ -179,7 +179,5 @@ public final class NIOHTTPRequestCompressor: ChannelOutboundHandler, RemovableCh
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension NIOHTTPRequestCompressor: Sendable {}
-#endif
diff --git a/Sources/NIOHTTPCompression/HTTPRequestDecompressor.swift b/Sources/NIOHTTPCompression/HTTPRequestDecompressor.swift
@@ -106,7 +106,5 @@ public final class NIOHTTPRequestDecompressor: ChannelDuplexHandler, RemovableCh
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension NIOHTTPRequestDecompressor: Sendable {}
-#endif
diff --git a/Sources/NIOHTTPCompression/HTTPResponseCompressor.swift b/Sources/NIOHTTPCompression/HTTPResponseCompressor.swift
@@ -222,10 +222,8 @@ public final class HTTPResponseCompressor: ChannelDuplexHandler, RemovableChanne
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension HTTPResponseCompressor: Sendable {}
-#endif
 
 /// A buffer object that allows us to keep track of how much of a HTTP response we've seen before
 /// a flush.

diff --git a/Sources/NIOHTTPCompression/HTTPResponseDecompressor.swift b/Sources/NIOHTTPCompression/HTTPResponseDecompressor.swift
@@ -122,7 +122,5 @@ public final class NIOHTTPResponseDecompressor: ChannelDuplexHandler, RemovableC
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension NIOHTTPResponseDecompressor: Sendable {}
-#endif
diff --git a/Sources/NIOSOCKS/Channel Handlers/SOCKSClientHandler.swift b/Sources/NIOSOCKS/Channel Handlers/SOCKSClientHandler.swift
@@ -114,10 +114,8 @@ public final class SOCKSClientHandler: ChannelDuplexHandler {
     }
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension SOCKSClientHandler: Sendable {}
-#endif
 
 extension SOCKSClientHandler {
 

diff --git a/Sources/NIOSOCKS/Channel Handlers/SOCKSServerHandshakeHandler.swift b/Sources/NIOSOCKS/Channel Handlers/SOCKSServerHandshakeHandler.swift
@@ -122,7 +122,5 @@ public final class SOCKSServerHandshakeHandler: ChannelDuplexHandler, RemovableC
 
 }
 
-#if swift(>=5.6)
 @available(*, unavailable)
 extension SOCKSServerHandshakeHandler: Sendable {}
-#endif
diff --git a/Tests/LinuxMain.swift b/Tests/LinuxMain.swift