GH-40488: [Swift] Add simple get swift example

Author: abandy

http/get_simple/swift/ArrowGet/.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

http/get_simple/swift/ArrowGet/Package.swift

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+// swift-tools-version: 6.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "ArrowGet",
+    platforms: [
+        .macOS(.v14)
+    ],
+    dependencies: [
+        .package(name: "Arrow", path: "vendor/Arrow"),
+        .package(url: "https://github.com/hummingbird-project/hummingbird.git", from: "2.3.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .executableTarget(
+            name: "ArrowGet",
+            dependencies: [
+                .product(name: "Arrow", package: "Arrow"),
+                .product(name: "Hummingbird", package: "hummingbird"),
+            ]
+        ),
+    ]
+)

http/get_simple/swift/ArrowGet/README.md

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+<!---
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+
+# HTTP GET Arrow Data: Simple Swift Client Example
+
+This directory contains a minimal example of an HTTP client implemented in Swift. The client:
+1. Sends an HTTP GET request to a server.
+2. Receives an HTTP 200 response from the server, with the response body containing an Arrow IPC stream record batch.
+3. Prints some of the record batches attributes and data to the terminal
+
+To run this example:
+1. download and copy Apache Arrow Swift's Arrow folder into the vendor/Arrow folder:
+
+```sh
+git clone --filter=blob:none --no-checkout --depth 1 --sparse https://github.com/apache/arrow.git
+pushd arrow
+git sparse-checkout add swift/Arrow
+git checkout
+popd
+mkdir -p vendor/Arrow
+mv arrow/swift/Arrow vendor
+rm -rf arrow
+```
+
+2. run:
+
+```sh
+swift run 
+```

http/get_simple/swift/ArrowGet/Sources/main.swift

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+// The Swift Programming Language
+// https://docs.swift.org/swift-book
+
+import Foundation
+import Arrow
+import Hummingbird
+
+
+func makeRecordBatch() throws -> RecordBatch {
+    let doubleBuilder: NumberArrayBuilder<Double> = try ArrowArrayBuilders.loadNumberArrayBuilder()
+    doubleBuilder.append(11.11)
+    doubleBuilder.append(22.22)
+    doubleBuilder.append(33.33)
+    doubleBuilder.append(44.44)
+    let stringBuilder = try ArrowArrayBuilders.loadStringArrayBuilder()
+    stringBuilder.append("test10")
+    stringBuilder.append("test22")
+    stringBuilder.append("test33")
+    stringBuilder.append("test44")
+    let date32Builder = try ArrowArrayBuilders.loadDate32ArrayBuilder()
+    let date2 = Date(timeIntervalSinceReferenceDate: 86400 * 1)
+    let date1 = Date(timeIntervalSinceReferenceDate: 86400 * 5000 + 352)
+    date32Builder.append(date1)
+    date32Builder.append(date2)
+    date32Builder.append(date1)
+    date32Builder.append(date2)
+    let doubleHolder = ArrowArrayHolderImpl(try doubleBuilder.finish())
+    let stringHolder = ArrowArrayHolderImpl(try stringBuilder.finish())
+    let date32Holder = ArrowArrayHolderImpl(try date32Builder.finish())
+    let result = RecordBatch.Builder()
+        .addColumn("col1", arrowArray: doubleHolder)
+        .addColumn("col2", arrowArray: stringHolder)
+        .addColumn("col3", arrowArray: date32Holder)
+        .finish()
+    switch result {
+    case .success(let recordBatch):
+        return recordBatch
+    case .failure(let error):
+        throw error
+    }
+}
+
+final class HttpTest {
+    var appStarted = false
+    var done = false
+    var stopFunc: (() -> Void)?
+    
+    func run() throws {
+        _ = Task {
+            let router = Router()
+            router.get("/") { request, _ -> ByteBuffer in
+                let recordBatch = try makeRecordBatch()
+                let arrowWriter = ArrowWriter()
+                let writerInfo = ArrowWriter.Info(.recordbatch, schema: recordBatch.schema, batches: [recordBatch])
+                switch arrowWriter.toStream(writerInfo) {
+                case .success(let writeData):
+                    return ByteBuffer(data: writeData)
+                case.failure(let error):
+                    throw error
+                }
+            }
+
+            // create application using router
+            let app = Application(
+                router: router,
+                configuration: .init(address: .hostname("127.0.0.1", port: 8081))
+            )
+
+            try await app.runService()
+            return ByteBuffer()
+        }
+        
+        let sem = DispatchSemaphore(value: 0)
+        let url = URL(string: "http://127.0.0.1:8081")!
+        let task = URLSession.shared.dataTask(with: url) { data, response, error in
+            defer {sem.signal()}
+            if let writeData = data {
+                let arrowReader = ArrowReader()
+                switch arrowReader.fromStream(writeData) {
+                case .success(let result):
+                    let recordBatches = result.batches
+                    print("recordBatch columns: \(recordBatches.count)")
+                    let rb = recordBatches[0]
+                    print("recordBatch columns: \(rb.columnCount)")
+                    for (idx, column) in rb.columns.enumerated() {
+                        print("col \(idx)")
+                        let array = column.array
+                        for idx in 0..<array.length {
+                            print("data col \(idx): \(String(describing:array.asAny(idx)))")
+                        }
+                    }
+                case.failure(let error):
+                    print("error: \(error)")
+                }
+            } else if let error = error {
+                print("HTTP Request Failed \(error)")
+            }
+        }
+
+        task.resume()        
+        _ = sem.wait(timeout: .distantFuture)
+        print("done running http server")
+    }
+}
+
+var httpTest = HttpTest()
+try httpTest.run()