Add support to ServiceExecutor

Examples/Package.resolved

@@ -0,0 +1,23 @@
+{
+  "pins" : [
+    {
+      "identity" : "alamofire",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/Alamofire/Alamofire.git",
+      "state" : {
+        "revision" : "bc268c28fb170f494de9e9927c371b8342979ece",
+        "version" : "5.7.1"
+      }
+    },
+    {
+      "identity" : "swift-syntax",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-syntax.git",
+      "state" : {
+        "revision" : "f1e9245226002bb134884345d4809b9543da3666",
+        "version" : "509.0.0-swift-DEVELOPMENT-SNAPSHOT-2023-06-17-a"
+      }
+    }
+  ],
+  "version" : 2
+}

Examples/Package.swift

@@ -0,0 +1,34 @@
+// swift-tools-version: 5.9
+
+import PackageDescription
+
+let package = Package(
+    name: "Examples",
+    platforms: [
+        .macOS(.v10_15),
+        .iOS(.v13),
+        .tvOS(.v13),
+        .watchOS(.v6),
+        .macCatalyst(.v13)
+    ],
+    products: [
+        .executable(
+            name: "Examples",
+            targets: ["Examples"]
+        ),
+    ],
+    dependencies: [
+        .package(name: "swift-request", path: "../"),
+        .package(url: "https://github.com/Alamofire/Alamofire.git", .upToNextMajor(from: "5.6.4"))
+    ],
+    targets: [
+        .executableTarget(
+            name: "Examples",
+            dependencies: [
+                .product(name: "SwiftRequest", package: "swift-request"),
+                .product(name: "Alamofire", package: "alamofire")
+            ],
+            path: "Sources"
+        )
+    ]
+)

Examples/Sources/AlamofireServiceExecutor.swift

@@ -0,0 +1,32 @@
+import Foundation
+import Alamofire
+import SwiftRequest
+
+class AlamofireServiceExecutor: ServiceExecutor {
+    let session: Session
+    
+    struct Error: Swift.Error {
+        let response: DataResponse<Data, AFError>
+    }
+    
+    init(session: Session = .default) {
+        self.session = session
+    }
+    
+    func execute(_ request: SwiftRequest.Request) async throws -> (Data, HTTPURLResponse) {
+        let task = session.request(request).serializingData()
+        let response = await task.response
+        
+        if let data = response.data, let urlResponse = response.response {
+            return (data, urlResponse)
+        }
+        
+        if let error = response.error {
+            throw error
+        }
+        
+        throw Error(response: response)
+    }
+}
+
+extension SwiftRequest.Request: URLRequestConvertible {}

Examples/Sources/TestService.swift

@@ -4,5 +4,5 @@ import Foundation
 @Service(resource: "sample")
 protocol SampleService {
     @POST("hello/{id}/{limit}")
-    func hello(@Path id: String?, @Path limit: Int) async throws -> [Int]
+    func hello(@Path id: String, @Path limit: Int) async throws -> [Int]
 }

Examples/Sources/main.swift

@@ -1,7 +1,16 @@
 import Foundation
 import SwiftRequest
 
-let service = QuoteServiceImpl(baseURL: "https://api.quotable.io")
+let useAlamofire: Bool = Bool.random()
+print("Using Alamofire: \(useAlamofire)")
+
+let executor: any ServiceExecutor = if useAlamofire {
+    AlamofireServiceExecutor()
+} else {
+    URLSessionServiceExecutor()
+}
+
+let service = QuoteServiceImpl(baseURL: "https://api.quotable.io", executor: executor)
 
 do {
     let quotes = try await service.getRandomQuotes(limit: 3)

Package.swift

@@ -12,11 +12,7 @@ let package = Package(
         .library(
             name: "SwiftRequest",
             targets: ["SwiftRequest"]
-        ),
-        .executable(
-            name: "SwiftRequestClient",
-            targets: ["SwiftRequestClient"]
-        ),
+        )
     ],
     dependencies: [
         // Depend on the latest Swift 5.9 prerelease of SwiftSyntax
@@ -37,9 +33,6 @@ let package = Package(
         // Library that exposes a macro as part of its API, which is used in client programs.
         .target(name: "SwiftRequest", dependencies: ["SwiftRequestMacros"]),
 
-        // A client of the library, which is able to use the macro in its own code.
-        .executableTarget(name: "SwiftRequestClient", dependencies: ["SwiftRequest"]),
-
         // A test target used to develop the macro implementation.
         .testTarget(
             name: "SwiftRequestTests",

Sources/SwiftRequest/Request+toURLRequest.swift

@@ -0,0 +1,48 @@
+import Foundation
+
+public extension Request {
+    func asURLRequest() throws -> URLRequest {
+        let url: URL
+        if let queryParams {
+            var components = URLComponents(url: self.url, resolvingAgainstBaseURL: false)!
+            components.queryItems = queryParams.compactMap { key, value in
+                guard let value = value else { return nil }
+                return URLQueryItem(name: key, value: value.description)
+            }
+            
+            url = components.url!
+        } else {
+            url = self.url
+        }
+        
+        var request = URLRequest(url: url)
+        request.httpMethod = self.method
+        
+        if let formFields = self.formFields {
+            var form = URLComponents()
+            form.queryItems = formFields.compactMap { key, value in
+                guard let value = value else { return nil }
+                return URLQueryItem(name: key, value: value.description)
+            }
+            
+            request.httpBody = form.query?.data(using: .utf8)
+        }
+        
+        if let body {
+            if body is Data {
+                request.httpBody = body as? Data
+            } else {
+                request.httpBody = try JSONEncoder().encode(body)
+            }
+        }
+        
+        if let headers {
+            for (key, value) in headers {
+                guard let value = value else { continue }
+                request.addValue(value.description, forHTTPHeaderField: key)
+            }
+        }
+        
+        return request
+    }
+}

Sources/SwiftRequest/Request.swift

@@ -25,50 +25,4 @@ public struct Request {
         self.formFields = formFields
         self.body = body
     }
-    
-    func getURLRequest() throws -> URLRequest {
-        let url: URL
-        if let queryParams {
-            var components = URLComponents(url: self.url, resolvingAgainstBaseURL: false)!
-            components.queryItems = queryParams.compactMap { key, value in
-                guard let value = value else { return nil }
-                return URLQueryItem(name: key, value: value.description)
-            }
-            
-            url = components.url!
-        } else {
-            url = self.url
-        }
-        
-        var request = URLRequest(url: url)
-        request.httpMethod = self.method
-        
-        if let formFields = self.formFields {
-            var form = URLComponents()
-            form.queryItems = formFields.compactMap { key, value in
-                guard let value = value else { return nil }
-                return URLQueryItem(name: key, value: value.description)
-            }
-            
-            request.httpBody = form.query?.data(using: .utf8)
-        }
-        
-        if let body {
-            if body is Data {
-                request.httpBody = body as? Data
-            } else {
-                request.httpBody = try JSONEncoder().encode(body)
-            }
-        }
-        
-        if let headers {
-            for (key, value) in headers {
-                guard let value = value else { continue }
-                request.addValue(value.description, forHTTPHeaderField: key)
-            }
-        }
-        
-        return request
-    }
 }
-

Sources/SwiftRequest/Service.swift

@@ -2,18 +2,26 @@ import Foundation
 
 open class Service {
     public let baseURL: URL
-    public let session: URLSession
+    public let executor: ServiceExecutor
     
-    public init(baseURL: URL, session: URLSession = .shared) {
+    public init(baseURL: URL, executor: ServiceExecutor = URLSessionServiceExecutor()) {
         self.baseURL = baseURL
-        self.session = session
+        self.executor = executor
     }
     
-    convenience public init(baseURL: String, session: URLSession = .shared) {
+    convenience public init(baseURL: String, executor: ServiceExecutor = URLSessionServiceExecutor()) {
         guard let baseURL = URL(string: baseURL) else {
             fatalError("Invalid baseURL")
         }
         
-        self.init(baseURL: baseURL, session: session)
+        self.init(baseURL: baseURL, executor: executor)
+    }
+    
+    convenience public init(baseURL: URL, session: URLSession) {
+        self.init(baseURL: baseURL, executor: URLSessionServiceExecutor(session: session))
+    }
+    
+    convenience public init(baseURL: String, session: URLSession) {
+        self.init(baseURL: baseURL, executor: URLSessionServiceExecutor(session: session))
     }
 }

Sources/SwiftRequest/ServiceContainer.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+public class ServiceContainer {
+    let baseURL: URL
+    let session: URLSession
+    
+    public init(baseURL: URL, session: URLSession = .shared) {
+        self.baseURL = baseURL
+        self.session = session
+    }
+    
+    convenience public init(baseURL: String, session: URLSession = .shared) {
+        guard let baseURL = URL(string: baseURL) else {
+            fatalError("Invalid baseURL")
+        }
+        
+        self.init(baseURL: baseURL, session: session)
+    }
+}

Sources/SwiftRequest/ServiceExecutor.swift

@@ -1,6 +1,10 @@
 import Foundation
 
-extension URLSession {
+public protocol ServiceExecutor {
+    func execute(_ request: Request) async throws -> (Data, HTTPURLResponse)
+}
+
+extension ServiceExecutor {
     public func execute<Output: Decodable>(_ request: Request) async throws -> Output {
         let (output, _): (Output, _) = try await self.execute(request)
         return output
@@ -16,13 +20,4 @@ extension URLSession {
         let (data, _) = try await self.execute(request)
         return data
     }
-    
-    public func execute(_ request: Request) async throws -> (Data, HTTPURLResponse) {
-        let urlRequest = try request.getURLRequest()
-        let (data, response) = try await URLSession.shared.data(for: urlRequest) as! (Data, HTTPURLResponse)
-        guard (200..<300).contains(response.statusCode) else {
-            throw HTTPResponseError(data: data, response: response)
-        }
-        return (data, response)
-    }
 }

Sources/SwiftRequest/URLSessionServiceExecutor.swift

@@ -0,0 +1,18 @@
+import Foundation
+
+public class URLSessionServiceExecutor: ServiceExecutor {
+    private let session: URLSession
+    
+    public init(session: URLSession = .shared) {
+        self.session = session
+    }
+    
+    public func execute(_ request: Request) async throws -> (Data, HTTPURLResponse) {
+        let urlRequest = try request.asURLRequest()
+        let (data, response) = try await session.data(for: urlRequest) as! (Data, HTTPURLResponse)
+        guard (200..<300).contains(response.statusCode) else {
+            throw HTTPResponseError(data: data, response: response)
+        }
+        return (data, response)
+    }
+}

Sources/SwiftRequestMacros/FunctionParameter.swift

@@ -28,7 +28,3 @@ class FunctionNamedParameter: FunctionParameter {
         super.init(syntax)
     }
 }
-
-class FunctionPathParameter: FunctionNamedParameter {
-    
-}

Sources/SwiftRequestMacros/MethodDiagnostics.swift

@@ -91,4 +91,12 @@ struct MethodDiagnostics: Diagnostics {
             id: "tooManyBodyParameters"
         )
     }
+
+    func optionalParameterNotSupported(in node: FunctionParameterSyntax, attribute: String) -> Diagnostic {
+        diagnostic(
+            for: node,
+            message: "@\(attribute) does not support optional parameters",
+            id: "optionalParameterNotSupported"
+        )
+    }
 }

Sources/SwiftRequestMacros/ServiceMethodExpander.swift

@@ -52,7 +52,7 @@ class ServiceMethodExpander {
         
         let codeBlock = CodeBlockSyntax {
             VariableDeclSyntax(Keyword.let, name: "request", initializer: .init(value: request))
-            ReturnStmtSyntax(expression: "try await session.execute(request)" as ExprSyntax)
+            ReturnStmtSyntax(expression: "try await executor.execute(request)" as ExprSyntax)
         }
         
         let newDeclaration = declaration
@@ -113,7 +113,7 @@ class ServiceMethodExpander {
         of declaration: FunctionDeclSyntax,
         in context: some MacroExpansionContext
     ) -> TokenSyntax? {
-        let parameters: [FunctionPathParameter] = getParameters(from: declaration, with: "Body")
+        let parameters: [FunctionNamedParameter] = getParameters(from: declaration, with: "Body")
         
         guard parameters.count <= 1 else {
             context.diagnose(diagnostics.tooManyBodyParameters(in: declaration))
@@ -132,7 +132,7 @@ class ServiceMethodExpander {
         of declaration: FunctionDeclSyntax,
         in context: some MacroExpansionContext
     ) -> DictionaryExprSyntax? {
-        let parameters: [FunctionPathParameter] = getParameters(from: declaration, with: name)
+        let parameters: [FunctionNamedParameter] = getParameters(from: declaration, with: name)
         
         if parameters.isEmpty {
             return nil
@@ -157,7 +157,18 @@ class ServiceMethodExpander {
     ) -> ExprSyntax? {
         let arguments = attribute.argument?.as(TupleExprElementListSyntax.self)
         
-        let parameters: [FunctionPathParameter] = getParameters(from: declaration, with: "Path")
+        let parameters: [FunctionNamedParameter] = getParameters(from: declaration, with: "Path")
+        
+        for parameter in parameters {
+            if parameter.optional {
+                context.diagnose(
+                    diagnostics.optionalParameterNotSupported(
+                        in: parameter.syntax,
+                        attribute: "Path"
+                    )
+                )
+            }
+        }
         
         guard let path = arguments?.first?.expression else {
             guard parameters.isEmpty else {
@@ -180,7 +191,6 @@ class ServiceMethodExpander {
         
         let replacementBlocks = getReplacementBlocks(from: path)
         
-        
         let parameterNames = parameters.map(\.name)
         
         let missingParameters = replacementBlocks.filter { !parameterNames.contains($0) }