Migrate ArrowType from class hierarchy to enum.

* Add Dockerfile to generate protos.
* Make Flight types Sendable structs where possible.
* Replaced data type with enum.
* Replaced ArrowType with enum.
* Flight tests run under Swift 6.2

Author: willtemperley

Package.swift

@@ -20,7 +20,7 @@ import PackageDescription
 let package = Package(
   name: "Arrow",
   platforms: [
-    .macOS(.v10_14)
+    .macOS(.v13)
   ],
   products: [
     .library(
@@ -37,6 +37,14 @@ let package = Package(
       url: "https://github.com/apple/swift-atomics.git",
       from: "1.3.0"
     ),
+    .package(
+      url: "https://github.com/grpc/grpc-swift.git",
+      from: "1.25.0"
+    ),
+    .package(
+      url: "https://github.com/apple/swift-protobuf.git",
+      from: "1.29.0"
+    ),
   ],
   targets: [
     .target(
@@ -56,6 +64,17 @@ let package = Package(
         // build: .unsafeFlags(["-warnings-as-errors"])
       ]
     ),
+    .target(
+      name: "ArrowFlight",
+      dependencies: [
+        "Arrow",
+        .product(name: "GRPC", package: "grpc-swift"),
+        .product(name: "SwiftProtobuf", package: "swift-protobuf"),
+      ],
+      swiftSettings: [
+        // build: .unsafeFlags(["-warnings-as-errors"])
+      ]
+    ),
     .testTarget(
       name: "ArrowTests",
       dependencies: ["Arrow", "ArrowC"],
@@ -66,5 +85,17 @@ let package = Package(
         // build: .unsafeFlags(["-warnings-as-errors"])
       ]
     ),
+    .testTarget(
+      name: "ArrowFlightTests",
+      dependencies: [
+        "Arrow",
+        "ArrowFlight",
+        .product(name: "GRPC", package: "grpc-swift"),
+        .product(name: "SwiftProtobuf", package: "swift-protobuf"),
+      ],
+      swiftSettings: [
+        // build: .unsafeFlags(["-warnings-as-errors"])
+      ]
+    ),
   ]
 )

README.md

@@ -1,15 +1,14 @@
 # Swift Arrow
 
-A Swift implementation of Apache Arrow, the cross-language development 
-platform for in-memory analytics.
+![Swift 6.2](https://img.shields.io/badge/Swift-6.2-orange?style=for-the-badge&logo=swift&logoColor=white)
 
-This is an independent Swift-focused project maintained by the Swift 
-community. It implements the Apache Arrow specification and is fully 
-compatible with other Arrow implementations.
+A Swift implementation of Apache Arrow, the universal columnar format for fast data interchange and in-memory analytics.
 
-## Relationship to Apache Arrow
-This project is based on Apache Arrow-Swift and maintains specification compatibility. See [LICENSE](LICENSE) for details.
-
-The decision was made to operate independently of the Apache Software Foundation (ASF). Good project governance requires maintainers with knowledge of Swift and the Swift community. Currently there are no active ASF maintaners with knowledge of Swift. Apache's CI infrastructure for Swift is unmaintained, leading to intermittent CI failures. Moving to a Swift-focused organisation allows decisions to be made according to the requirements of the Swift community.
+This project is based on Arrow-Swift, the official Swift implementation of Apache Arrow. The decision was made to at least temporarily operate independently of the Apache Software Foundation (ASF). Currently there are no active ASF maintaners with knowledge of Swift, and the only [Apache approved CI for Swift](https://github.com/apache/infrastructure-actions/blob/main/approved_patterns.yml) is [setup-swift which is unmaintained](https://github.com/swift-actions/setup-swift/issues), leading to intermittent CI failures. This has led to delays in much-needed fixes being implemented.
 
 Original source: https://github.com/apache/arrow-swift
+
+Changes made since forking Arrow-Swift:
+* Moved to the swiftlang workflows: https://github.com/swiftlang/github-workflows
+* `ArrowType` has been moved from a class hierarchy to an enum to improve concurrency support.
+* A gradual migration from classes to structs, where appropriate, has begun.

Scripts/Dockerfile

@@ -0,0 +1,55 @@
+FROM ubuntu:22.04
+
+# --- Dependencies ---
+RUN apt-get update && apt-get install -y \
+    curl unzip build-essential git libssl-dev libicu-dev libatomic1 \
+    binutils libc6-dev libgcc-11-dev libstdc++-11-dev libpython3.10 \
+    libxml2 libcurl4 libedit2 zlib1g-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# --- Install protoc ---
+ENV PROTOC_VERSION=28.2
+RUN curl -LO https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-aarch_64.zip \
+    && unzip protoc-${PROTOC_VERSION}-linux-aarch_64.zip -d /usr/local \
+    && rm protoc-${PROTOC_VERSION}-linux-aarch_64.zip
+
+# --- Install Swift (ARM64 build) ---
+ENV SWIFT_VERSION=6.1.1
+ENV SWIFT_INSTALL_DIR=/usr/local/swift
+RUN curl -LO https://swift.org/builds/swift-${SWIFT_VERSION}-release/ubuntu2204-aarch64/swift-${SWIFT_VERSION}-RELEASE/swift-${SWIFT_VERSION}-RELEASE-ubuntu22.04-aarch64.tar.gz \
+    && mkdir -p ${SWIFT_INSTALL_DIR} \
+    && tar -xzf swift-${SWIFT_VERSION}-RELEASE-ubuntu22.04-aarch64.tar.gz -C ${SWIFT_INSTALL_DIR} --strip-components=1 \
+    && rm swift-${SWIFT_VERSION}-RELEASE-ubuntu22.04-aarch64.tar.gz
+
+# Add Swift to PATH
+ENV PATH="${SWIFT_INSTALL_DIR}/usr/bin:${PATH}"
+
+# Verify Swift installation
+RUN swift --version
+
+# --- Build Swift Protobuf plugin ---
+RUN git clone --depth=1 https://github.com/apple/swift-protobuf.git /swift-protobuf \
+    && cd /swift-protobuf \
+    && swift build -c release \
+    && cp .build/release/protoc-gen-swift /usr/local/bin/ \
+    && cd / \
+    && rm -rf /swift-protobuf
+
+# --- Build gRPC Swift plugin ---
+RUN git clone --depth=1 https://github.com/grpc/grpc-swift.git /grpc-swift \
+    && cd /grpc-swift \
+    && swift build -c release \
+    && cp .build/release/protoc-gen-grpc-swift /usr/local/bin/ \
+    && cd / \
+    && rm -rf /grpc-swift
+
+# Verify installations
+RUN protoc --version \
+    && protoc-gen-swift --version \
+    && protoc-gen-grpc-swift --version
+
+WORKDIR /src
+
+# Use a more flexible entrypoint
+ENTRYPOINT ["protoc"]
+CMD ["--help"]