Split client and server examples into separate packages (#311)

### Motivation

The client and server examples currently live in a single Swift package.
The majority of adopters will probably want to crib from an example of a
client _or_ a server, and having them together runs the risk of them
cargo-culting dependencies they don't need. The current setup also
prevents us from updating the dependencies in the client example if the
server transport releases are lagging.

### Modifications

- Split the client and server examples into separate Swift packages.
- Update the client example to the latest runtime and main generator.
- Drop dependencies in server example to 0.2.0 family for now.

### Result

Client example package is updated to latest dependencies and can build.

### Test Plan

Tested that both packages can build locally.

---------

Signed-off-by: Si Beaumont <[email protected]>

Author: simonjbeaumont

Examples/GreetingService/Package.swift

@@ -20,10 +20,9 @@ let package = Package(
         .macOS(.v13)
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-openapi-generator", .upToNextMinor(from: "0.3.0")),
-        .package(url: "https://github.com/apple/swift-openapi-runtime", .upToNextMinor(from: "0.3.0")),
-        .package(url: "https://github.com/apple/swift-openapi-urlsession", .upToNextMinor(from: "0.3.0")),
-        .package(url: "https://github.com/swift-server/swift-openapi-vapor", .upToNextMinor(from: "0.3.0")),
+        .package(url: "https://github.com/apple/swift-openapi-generator", .upToNextMinor(from: "0.2.0")),
+        .package(url: "https://github.com/apple/swift-openapi-runtime", .upToNextMinor(from: "0.2.0")),
+        .package(url: "https://github.com/swift-server/swift-openapi-vapor", .upToNextMinor(from: "0.2.0")),
         .package(url: "https://github.com/vapor/vapor", from: "4.76.0"),
     ],
     targets: [
@@ -38,18 +37,6 @@ let package = Package(
                 .plugin(name: "OpenAPIGenerator", package: "swift-openapi-generator")
             ]
         ),
-
-        .executableTarget(
-            name: "GreetingServiceClient",
-            dependencies: [
-                .product(name: "OpenAPIRuntime", package: "swift-openapi-runtime"),
-                .product(name: "OpenAPIURLSession", package: "swift-openapi-urlsession"),
-            ],
-            plugins: [
-                .plugin(name: "OpenAPIGenerator", package: "swift-openapi-generator")
-            ]
-        ),
-
         .testTarget(
             name: "GreetingServiceMockTests",
             dependencies: [

Examples/GreetingService/Sources/GreetingService/openapi.yaml

@@ -0,0 +1,34 @@
+openapi: '3.0.3'
+info:
+  title: GreetingService
+  version: 1.0.0
+servers:
+  - url: https://example.com/api
+    description: Example
+paths:
+  /greet:
+    get:
+      operationId: getGreeting
+      parameters:
+      - name: name
+        required: false
+        in: query
+        description: A name used in the returned greeting.
+        schema:
+          type: string
+      responses:
+        '200':
+          description: A success response with a greeting.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Greeting'
+components:
+  schemas:
+    Greeting:
+      type: object
+      properties:
+        message:
+          type: string
+      required:
+        - message

Examples/GreetingService/Sources/GreetingService/openapi.yaml

@@ -0,0 +1,11 @@
+.DS_Store
+.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.vscode
+/Package.resolved
+.ci/
+.docc-build/

Examples/GreetingService/Sources/GreetingServiceClient/openapi.yaml

@@ -0,0 +1,41 @@
+// swift-tools-version:5.8
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftOpenAPIGenerator open source project
+//
+// Copyright (c) 2023 Apple Inc. and the SwiftOpenAPIGenerator project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftOpenAPIGenerator project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+import PackageDescription
+
+let package = Package(
+    name: "GreetingService",
+    platforms: [
+        .macOS(.v13)
+    ],
+    dependencies: [
+        // TODO: When swift-openapi-generator is tagged with 0.3.0, stop depending on main.
+        // .package(url: "https://github.com/apple/swift-openapi-generator", .upToNextMinor(from: "0.3.0"),
+        .package(url: "https://github.com/apple/swift-openapi-generator", branch: "main"),
+        .package(url: "https://github.com/apple/swift-openapi-runtime", .upToNextMinor(from: "0.3.0")),
+        .package(url: "https://github.com/apple/swift-openapi-urlsession", .upToNextMinor(from: "0.3.0")),
+    ],
+    targets: [
+        .executableTarget(
+            name: "GreetingServiceClient",
+            dependencies: [
+                .product(name: "OpenAPIRuntime", package: "swift-openapi-runtime"),
+                .product(name: "OpenAPIURLSession", package: "swift-openapi-urlsession"),
+            ],
+            plugins: [
+                .plugin(name: "OpenAPIGenerator", package: "swift-openapi-generator")
+            ]
+        )
+    ]
+)

Examples/GreetingServiceClient/.gitignore

@@ -0,0 +1,24 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftOpenAPIGenerator open source project
+//
+// Copyright (c) 2023 Apple Inc. and the SwiftOpenAPIGenerator project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftOpenAPIGenerator project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+import GreetingService
+
+// Mock operates on value types, and requires no concrete client or server transport.
+struct MockGreetingService: APIProtocol {
+    func getGreeting(
+        _ input: Operations.getGreeting.Input
+    ) async throws -> Operations.getGreeting.Output {
+        let name = input.query.name ?? "<unknown>"
+        return .ok(.init(body: .json(.init(message: "(mock) Hello, \(name)"))))
+    }
+}