add --with-url option

Author: sebsto

Sources/AWSLambdaPluginHelper/lambda-init/Initializer.swift

@@ -21,42 +21,48 @@ import Foundation
 struct Initializer {
 
     private let destFileName = "Sources/main.swift"
-
+    
     func initialize(arguments: [String]) async throws {
 
         let configuration = try InitializerConfiguration(arguments: arguments)
-
+        
         if configuration.help {
             self.displayHelpMessage()
             return
         }
-
+        
         let destFileURL = configuration.destinationDir.appendingPathComponent(destFileName)
         do {
-            try functionWithUrlTemplate.write(to: destFileURL, atomically: true, encoding: .utf8)
-
+            
+            let template = TemplateType.template(for: configuration.templateType)
+            try template.write(to: destFileURL, atomically: true, encoding: .utf8)
+            
             if configuration.verboseLogging {
                 print("File created at: \(destFileURL)")
             }
-
+            
             print("✅ Lambda function written to \(destFileName)")
-            print("📦 You can now package with: 'swift package archive'")
+            print("📦 You can now package with: 'swift package lambda-build'")
         } catch {
             print("🛑Failed to create the Lambda function file: \(error)")
         }
     }
-
-
+    
+    
     private func displayHelpMessage() {
         print(
             """
             OVERVIEW: A SwiftPM plugin to scaffold a HelloWorld Lambda function.
-
+                      By default, it creates a Lambda function that receives a JSON 
+                      document and responds with another JSON document.
+            
             USAGE: swift package lambda-init
                                  [--help] [--verbose]
+                                 [--with-url]
                                  [--allow-writing-to-package-directory]
-
+            
             OPTIONS:
+            --with-url                            Create a Lambda function exposed with an URL
             --allow-writing-to-package-directory  Don't ask for permissions to write files.
             --verbose                             Produce verbose output for debugging.
             --help                                Show help information.
@@ -65,32 +71,50 @@ struct Initializer {
     }
 }
 
+private enum TemplateType {
+    case `default`
+    case url
+    
+    static func template(for type: TemplateType) -> String {
+        switch type {
+        case .default: return functionWithJSONTemplate
+        case .url: return functionWithUrlTemplate
+        }
+    }
+}
+
 private struct InitializerConfiguration: CustomStringConvertible {
     public let help: Bool
     public let verboseLogging: Bool
     public let destinationDir: URL
-
+    public let templateType: TemplateType
+    
     public init(arguments: [String]) throws {
         var argumentExtractor = ArgumentExtractor(arguments)
         let verboseArgument = argumentExtractor.extractFlag(named: "verbose") > 0
         let helpArgument = argumentExtractor.extractFlag(named: "help") > 0
         let destDirArgument = argumentExtractor.extractOption(named: "dest-dir")
-
+        let templateURLArgument = argumentExtractor.extractFlag(named: "with-url") > 0
+        
         // help required ?
         self.help = helpArgument
-
+        
         // verbose logging required ?
         self.verboseLogging = verboseArgument
 
         // dest dir
         self.destinationDir = URL(fileURLWithPath: destDirArgument[0])
+        
+        // template type. Default is the JSON one
+        self.templateType = templateURLArgument ? .url : .default
     }
-
+    
     var description: String {
         """
         {
           verboseLogging: \(self.verboseLogging)
           destinationDir: \(self.destinationDir)
+          templateType: \(self.templateType)
         }
         """
     }

Sources/AWSLambdaPluginHelper/lambda-init/Template.swift

@@ -31,3 +31,32 @@ let functionWithUrlTemplate = #"""
 
     try await runtime.run()
     """#
+
+let functionWithJSONTemplate = #"""
+    import AWSLambdaRuntime
+
+    // the data structure to represent the input parameter
+    struct HelloRequest: Decodable {
+        let name: String
+        let age: Int
+    }
+
+    // the data structure to represent the output response
+    struct HelloResponse: Encodable {
+        let greetings: String
+    }
+    
+    // in this example we receive a HelloRequest JSON and we return a HelloResponse JSON    
+
+    // the Lambda runtime
+    let runtime = LambdaRuntime {
+        (event: HelloRequest, context: LambdaContext) in
+
+        HelloResponse(
+            greetings: "Hello \(event.name). You look \(event.age > 30 ? "younger" : "older") than your age."
+        )
+    }
+
+    // start the loop
+    try await runtime.run()    
+    """#