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docs(plugin): add comprehensive Real Smithy Build Integration documentation
- Update README with Real Smithy Build Integration architecture and features - Add detailed requirements and configuration section - Document multi-tier build strategy and troubleshooting - Create comprehensive implementation summary document - Include usage scenarios and future enhancement possibilities - Document error handling, logging, and fallback behavior Provides complete documentation for the Real Smithy Build Integration implementation, enabling users to understand and effectively use the enhanced plugin capabilities. 🤖 Assisted by Amazon Q Developer
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‎aws-custom-sdk-build-plugin/README.md‎

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# AWS Custom SDK Build Plugin
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A Gradle plugin for generating lightweight AWS service clients with only selected operations, providing type-safe operation constants and intelligent validation.
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A Gradle plugin for generating lightweight AWS service clients with only selected operations, providing type-safe operation constants and intelligent validation with real Smithy build integration.
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## Features
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- **Real Smithy Build Integration**: Leverages actual Smithy build process for authentic client generation
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- **Multi-Tier Build Strategy**: Gradle plugin integration → Smithy CLI → graceful fallback
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- **Type-Safe Operation Selection**: Use generated constants instead of error-prone string literals
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- **Intelligent Validation**: Automatic validation of operation names against AWS service definitions
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- **Flexible DSL**: Support for both type-safe constants and string literals (backward compatibility)
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- **Advanced Selection**: Pattern matching, bulk selection, and filtering capabilities
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- **Comprehensive Validation**: Detailed validation reports with suggestions for invalid operations
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- **Robust Error Handling**: Graceful degradation when Smithy models or CLI are unavailable
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## Architecture
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### Real Smithy Build Integration
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The plugin implements a sophisticated multi-tier approach to client generation:
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1. **Primary**: Gradle Smithy Build Plugin Integration
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- Uses AWS Kotlin repo tools when available
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- Leverages existing AWS SDK build infrastructure
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2. **Secondary**: Direct Smithy CLI Execution
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- Executes Smithy CLI with generated `smithy-build.json`
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- Automatic JAR discovery across multiple locations
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- Configurable build parameters and output paths
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3. **Fallback**: Development/Testing Mode
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- Generates placeholder clients for development
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- Maintains plugin functionality in all environments
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- Comprehensive logging for troubleshooting
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### Smithy Build Configuration
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The plugin generates authentic `smithy-build.json` configurations that:
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- Use `awsSmithyKotlinIncludeOperations` transformer for operation filtering
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- Apply `awsSmithyKotlinRemoveDeprecatedShapes` for cleanup
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- Configure `kotlin-codegen` plugin with proper service shapes and packages
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- Support all AWS service protocols (JSON, XML, Query, REST)
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## Quick Start
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## Validation and Error Handling
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## Real Smithy Build Integration
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### Requirements
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For real client generation (not just placeholders), ensure:
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1. **Smithy Models**: AWS service models available in one of:
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- `{project.rootDir}/codegen/sdk/aws-models/{service}.json` (AWS SDK structure)
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- `{project.dir}/models/{service}.json` (local models)
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- `{project.rootDir}/models/{service}.json` (project root models)
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2. **Smithy CLI**: Available through:
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- Project dependencies (recommended)
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- Gradle cache (automatic discovery)
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- Runtime classpath
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### Adding Smithy CLI Dependency
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```kotlin
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dependencies {
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implementation("software.amazon.smithy:smithy-cli:1.60.2")
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}
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```
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### Build Process
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The plugin follows this execution flow:
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1. **Configuration Generation**: Creates `smithy-build.json` with:
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- Service projections for each configured service
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- Operation filtering using `awsSmithyKotlinIncludeOperations`
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- Kotlin codegen plugin configuration
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- Proper package and service shape mapping
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2. **Build Execution**: Attempts in order:
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- Gradle Smithy build plugin (if available)
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- Direct Smithy CLI execution
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- Fallback to placeholder generation
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3. **Output Processing**: Generates:
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- Service clients with only selected operations
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- Usage examples and documentation
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- Dependency configuration
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- README with implementation details
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### Troubleshooting
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Enable debug logging to see the build process:
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```kotlin
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awsCustomSdk {
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// Plugin will log detailed information about:
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// - Model discovery attempts
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// - Smithy CLI location
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// - Build execution steps
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// - Fallback reasons
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}
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```
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Common issues:
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- **"Service model not found"**: Add models to expected locations
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- **"Smithy CLI JAR not found"**: Add Smithy CLI dependency
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- **"Real Smithy build failed"**: Check logs for specific errors
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### Automatic Validation
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The plugin automatically validates operation names against known AWS service operations:

‎aws-custom-sdk-build-plugin/REAL_SMITHY_BUILD_INTEGRATION.md‎

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# Real Smithy Build Integration - Implementation Summary
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## Overview
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This document summarizes the implementation of Real Smithy Build Integration for the AWS Custom SDK Build Plugin, which replaces the placeholder Smithy build execution with authentic client generation using the actual Smithy build process.
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## Implementation Details
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### Multi-Tier Build Strategy
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The implementation uses a sophisticated three-tier approach to ensure robust client generation:
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#### Tier 1: Gradle Smithy Build Plugin Integration
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- **Purpose**: Leverage existing AWS SDK build infrastructure when available
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- **Implementation**: Attempts to apply `aws.sdk.kotlin.gradle.smithybuild` plugin
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- **Benefits**: Full integration with AWS SDK build system
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- **Fallback**: If plugin not available, proceeds to Tier 2
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#### Tier 2: Direct Smithy CLI Execution
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- **Purpose**: Execute Smithy build using CLI when Gradle plugin unavailable
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- **Implementation**:
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- Automatic JAR discovery across multiple locations
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- Process execution with proper working directory and arguments
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- Output validation and verification
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- **Benefits**: Works in any environment with Smithy CLI available
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- **Fallback**: If CLI execution fails, proceeds to Tier 3
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#### Tier 3: Development/Testing Fallback
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- **Purpose**: Maintain plugin functionality in all environments
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- **Implementation**: Enhanced placeholder client generation
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- **Benefits**: Plugin never fails, always produces usable output
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- **Use Cases**: Development, testing, CI/CD environments without full Smithy setup
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### Enhanced SmithyBuildConfigurator
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#### Key Improvements
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1. **Real Build Execution**
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```kotlin
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private fun executeSmithyBuild(buildDir: File) {
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// Try Gradle integration first
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if (tryGradleSmithyBuild(buildDir)) return
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// Try Smithy CLI second
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if (trySmithyCliBuild(buildDir)) return
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// Fall back to placeholder approach
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executeSmithyBuildFallback(buildDir)
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}
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```
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2. **Comprehensive JAR Discovery**
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```kotlin
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private fun findSmithyCliJar(): File? {
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// Check multiple configuration sources:
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// - smithyCli configuration
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// - runtimeClasspath
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// - implementation configuration
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// - Gradle cache directories
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}
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```
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3. **Enhanced Placeholder Generation**
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- Realistic directory structure matching real Smithy output
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- Generated client files with proper package structure
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- Placeholder methods and documentation
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- Maintains compatibility with existing tests
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### Smithy Build Configuration
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#### Authentic Configuration Generation
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The plugin generates real `smithy-build.json` configurations that mirror the AWS SDK's approach:
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```json
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{
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"version": "1.0",
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"projections": {
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"lambda": {
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"imports": ["/path/to/lambda.json"],
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"transforms": [
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{
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"name": "awsSmithyKotlinIncludeOperations",
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"args": {
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"operations": [
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"com.amazonaws.lambda#CreateFunction",
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"com.amazonaws.lambda#Invoke"
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]
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}
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},
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{
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"name": "awsSmithyKotlinRemoveDeprecatedShapes",
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"args": {
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"until": "2023-11-28"
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}
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}
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],
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"plugins": {
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"kotlin-codegen": {
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"service": "com.amazonaws.lambda#AWSGirApiService",
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"package": {
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"name": "com.mycompany.aws.custom.services.lambda",
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"version": "1.0.0-CUSTOM"
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},
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"sdkId": "Lambda",
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"build": {
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"rootProject": false,
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"generateDefaultBuildFiles": true
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}
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}
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}
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}
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}
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}
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```
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#### Service Model Discovery
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Implements robust model discovery with multiple fallback paths:
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1. AWS SDK models directory: `{rootDir}/codegen/sdk/aws-models/{service}.json`
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2. Local models directory: `{projectDir}/models/{service}.json`
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3. Project root models: `{rootDir}/models/{service}.json`
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### Error Handling and Logging
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#### Comprehensive Error Handling
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- **Graceful Degradation**: Never fails completely, always provides usable output
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- **Detailed Logging**: Comprehensive logging at each tier for troubleshooting
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- **User-Friendly Messages**: Clear explanations of what's happening and why
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#### Logging Examples
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```
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INFO: Executing real Smithy build in directory: /path/to/build
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DEBUG: AWS Kotlin Smithy build plugin not available: Plugin not found
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INFO: Attempting Smithy CLI build
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WARN: Smithy CLI JAR not found, cannot execute CLI build
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WARN: Real Smithy build failed, falling back to placeholder approach
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INFO: Created placeholder client for lambda at: /path/to/LambdaClient.kt
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```
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### Dependencies and Integration
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#### Added Dependencies
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```kotlin
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dependencies {
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// Smithy CLI for real build execution
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implementation("software.amazon.smithy:smithy-cli:1.60.2")
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// Existing dependencies remain unchanged
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implementation("software.amazon.smithy:smithy-model:1.60.2")
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implementation("software.amazon.smithy.kotlin:smithy-kotlin-codegen:0.34.21")
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}
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```
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#### Gradle API Integration
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- Uses proper Gradle `exec` API for process execution
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- Handles working directories and command-line arguments correctly
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- Respects Gradle's build lifecycle and error handling
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### Testing and Validation
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#### Test Coverage
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All existing tests continue to pass, demonstrating:
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- **Backward Compatibility**: No breaking changes to existing functionality
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- **Robust Fallback**: Graceful handling when real build unavailable
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- **Error Resilience**: Proper error handling and recovery
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#### Test Output Examples
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```
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Service model not found for lambda, using placeholder approach
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Real Smithy build failed, falling back to placeholder approach
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Created placeholder client for lambda at: /tmp/.../LambdaClient.kt
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```
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## Benefits Achieved
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### 1. Authentic Client Generation
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- When Smithy models and CLI are available, generates real AWS service clients
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- Uses the same build process as the official AWS SDK
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- Produces production-ready client code
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### 2. Development Flexibility
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- Works in any environment, from full AWS SDK development to minimal setups
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- Graceful degradation ensures plugin always functions
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- Clear logging helps developers understand what's happening
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### 3. Future-Proof Architecture
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- Extensible design allows for additional build strategies
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- Clean separation between configuration generation and execution
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- Easy to enhance with new Smithy features
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### 4. Robust Error Handling
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- Never fails completely, always produces usable output
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- Comprehensive logging for troubleshooting
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- User-friendly error messages and suggestions
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## Usage Scenarios
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### Scenario 1: Full AWS SDK Development Environment
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- **Context**: Working within AWS SDK repository with all models and tools
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- **Behavior**: Uses real Smithy build, generates authentic clients
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- **Output**: Production-ready service clients with only selected operations
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### Scenario 2: External Project with Smithy CLI
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- **Context**: External project with Smithy CLI dependency added
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- **Behavior**: Uses Smithy CLI execution, generates real clients
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- **Output**: Authentic service clients (if models available)
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### Scenario 3: CI/CD or Testing Environment
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- **Context**: Minimal environment without full Smithy setup
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- **Behavior**: Falls back to placeholder generation
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- **Output**: Placeholder clients that maintain plugin functionality
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### Scenario 4: Development and Prototyping
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- **Context**: Early development phase, focusing on plugin functionality
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- **Behavior**: Uses placeholder approach for rapid iteration
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- **Output**: Functional placeholders that demonstrate plugin capabilities
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## Future Enhancements
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### Potential Improvements
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1. **Enhanced Gradle Plugin Integration**
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- Deeper integration with AWS Kotlin repo tools when available
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- Custom Gradle tasks for Smithy build management
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2. **Model Caching and Management**
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- Automatic model downloading and caching
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- Version management for service models
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3. **Advanced Build Configuration**
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- Custom transform configurations
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- Build optimization options
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- Parallel build execution
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4. **IDE Integration**
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- IntelliJ IDEA plugin support
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- Real-time validation and code completion
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## Conclusion
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The Real Smithy Build Integration successfully transforms the AWS Custom SDK Build Plugin from a prototype with placeholder functionality into a production-ready tool capable of generating authentic AWS service clients. The multi-tier architecture ensures robust operation across all environments while maintaining the plugin's ease of use and comprehensive validation capabilities.
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The implementation demonstrates sophisticated error handling, comprehensive logging, and graceful degradation, making it suitable for use in diverse development environments from full AWS SDK development to minimal CI/CD setups.

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