# HTTP Plugin Refactoring Summary

## Overview
Refactored `noetl/plugin/http.py` (362 lines) into a modular package structure with clear separation of concerns: authentication, request building, response processing, and task execution.

## Previous Structure (Monolithic)

```
noetl/plugin/
└── http.py          # Single file with all HTTP logic (362 lines)
```

**Problems**:
- Mixed concerns (auth, request, response, execution)
- Long single file difficult to navigate
- Tightly coupled logic
- Hard to test individual components

## New Structure (Modular Package)

```
noetl/plugin/http/
├── __init__.py      (10 lines)  - Package exports
├── auth.py          (72 lines)  - Authentication handling
├── request.py       (100 lines) - Request preparation
├── response.py      (87 lines)  - Response processing
└── executor.py      (318 lines) - Main execution logic
```

**Total**: 587 lines (increase due to enhanced documentation and structure)

## Module Breakdown

### 1. **auth.py** (72 lines)

**Purpose**: Process authentication and build HTTP headers

**Function**:
- `build_auth_headers()`: Build authentication headers from resolved auth items

**Supported Auth Types**:
- **Bearer**: Token-based authentication
- **Basic**: Username/password authentication
- **API Key**: Custom header-based authentication
- **Header**: Direct header injection

**Features**:
- Clean separation of auth logic
- Support for multiple auth types
- Detailed logging

### 2. **request.py** (100 lines)

**Purpose**: Prepare HTTP requests with proper parameter routing

**Functions**:
- `build_request_args()`: Build httpx request arguments
- `redact_sensitive_headers()`: Redact sensitive headers for logging

**Features**:
- Automatic query/body routing based on HTTP method
- GET/DELETE → query parameters
- POST/PUT/PATCH → request body
- Content-Type aware (JSON, form-urlencoded, multipart)
- Legacy parameter support (backward compatibility)
- Safe header logging with redaction

### 3. **response.py** (87 lines)

**Purpose**: Process HTTP responses and extract data

**Functions**:
- `process_response()`: Parse and extract response data
- `create_mock_response()`: Create mock responses for testing

**Features**:
- Content-Type aware parsing (JSON/text)
- Response metadata extraction
- Mock response generation for development
- Error-safe parsing

### 4. **executor.py** (318 lines)

**Purpose**: Main orchestration and execution logic

**Main Function**:
- `execute_http_task()`: Primary entry point for HTTP task execution

**Helper Functions**:
- `_process_authentication()`: Authentication workflow
- `_should_mock_request()`: Local domain mocking check
- `_should_mock_on_error()`: Error mocking check
- `_complete_task()`: Task completion and logging

**Features**:
- Task lifecycle management
- Event logging integration
- Development mocking support
- Error handling and recovery
- Backward compatibility support

## Key Features

### Authentication Support
```python
# Multiple auth types supported
auth_config = {
    'type': 'bearer',
    'token': 'secret-token'
}

# Or basic auth
auth_config = {
    'type': 'basic',
    'username': 'user',
    'password': 'pass'
}
```

### Request Configuration
```python
# Unified data model
task_config = {
    'method': 'POST',
    'endpoint': 'https://api.example.com/users',
    'data': {
        'query': {'filter': 'active'},  # Query parameters
        'body': {'name': 'John'}         # Request body
    }
}
```

### Development Mocking
```python
# Mock local domains in development
export NOETL_HTTP_MOCK_LOCAL=true

# Mock on errors for testing
export NOETL_HTTP_MOCK_ON_ERROR=true
```

## Usage

```python
from noetl.plugin.http import execute_http_task

# Execute HTTP task
result = execute_http_task(
    task_config={
        'method': 'GET',
        'endpoint': 'https://api.example.com/data',
        'headers': {'Accept': 'application/json'}
    },
    context={'execution_id': 'exec-123'},
    jinja_env=env,
    task_with={}
)
```

## Migration Path

### Before
```python
from noetl.plugin.http import execute_http_task
```

### After (No Change)
```python
# Same import works - fully backward compatible
from noetl.plugin.http import execute_http_task
from noetl.plugin import execute_http_task
```

## Changes Made

1. **Created http package**: Split monolithic file into 4 focused modules
2. **Separated concerns**:
   - Authentication logic → `auth.py`
   - Request building → `request.py`
   - Response processing → `response.py`
   - Task execution → `executor.py`
3. **Enhanced modularity**: Each module can be tested independently
4. **Improved documentation**: Clear docstrings for all functions
5. **Maintained API**: Zero breaking changes - same public interface

## Files Modified

**Created**:
- `noetl/plugin/http/__init__.py`
- `noetl/plugin/http/auth.py`
- `noetl/plugin/http/request.py`
- `noetl/plugin/http/response.py`
- `noetl/plugin/http/executor.py`

**Removed**:
- `noetl/plugin/http.py`

**No Other Changes**: All other code continues to work without modification

## Benefits

### 1. **Clear Separation of Concerns**
- Authentication isolated from request/response
- Each module has single responsibility
- Easy to locate and modify specific functionality

### 2. **Improved Testability**
- Each module can be unit tested independently
- Mock dependencies easily
- Test specific scenarios in isolation

### 3. **Better Maintainability**
- Smaller, focused modules easier to understand
- Changes isolated to relevant module
- Reduced risk of unintended side effects

### 4. **Enhanced Readability**
- Clear module names indicate purpose
- Well-documented functions
- Logical code organization

### 5. **Easier Extension**
- Add new auth types to `auth.py`
- Add request features to `request.py`
- Add response parsers to `response.py`
- No need to modify unrelated code

### 6. **100% Backward Compatible**
- Same public API
- Same function signatures
- Same behavior
- No breaking changes

## Line Count Analysis

**Before**: 362 lines (single file)

**After**: 587 lines (5 files)
- `__init__.py`: 10 lines
- `auth.py`: 72 lines
- `request.py`: 100 lines
- `response.py`: 87 lines
- `executor.py`: 318 lines

**Increase**: 225 lines (62% increase)

**Reasons for increase**:
- Enhanced documentation (detailed docstrings)
- Better code structure (helper functions)
- Improved separation (less coupling)
- Package initialization
- More descriptive logging

## Verification

✅ All imports work correctly
✅ execute_http_task function signature maintained
✅ All sub-modules load properly
✅ Server loads successfully (85 routes)
✅ Worker module functional
✅ Old http.py file removed
✅ Zero breaking changes

## Design Philosophy

### Separation of Concerns
Each module handles one aspect:
- **auth**: Authentication and authorization
- **request**: HTTP request preparation
- **response**: HTTP response processing
- **executor**: Task orchestration

### Single Responsibility
Each function does one thing well:
- `build_auth_headers`: Only builds headers
- `build_request_args`: Only prepares request args
- `process_response`: Only processes responses
- `execute_http_task`: Only orchestrates execution

### Composability
Modules work together through well-defined interfaces:
```
executor.py
    ↓ uses
auth.py → build_auth_headers()
request.py → build_request_args()
response.py → process_response()
```

### Testability
Each module can be tested independently:
- Mock auth resolution in `auth.py` tests
- Mock httpx client in `executor.py` tests
- Test request building without execution
- Test response parsing with sample data

This refactoring transforms the HTTP plugin into a maintainable, testable, and extensible package while maintaining 100% backward compatibility!
