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Merge PR #24: Add high-level utility functions and classes
Co-authored-by: P4X-ng <223870169+P4X-ng@users.noreply.github.com>
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‎README.md‎

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@@ -13,6 +13,19 @@ I/O using [Trio](https://trio.readthedocs.io/). This library handles the
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WebSocket negotiation and session management, allowing you to transparently
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multiplex commands, responses, and events over a single connection.
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## Features
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- **Pure CDP**: Direct access to Chrome DevTools Protocol
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- **Async/Await**: Built on Trio for structured concurrency
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- **Type Safety**: Full type hints for better IDE support
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- **High-Level Utilities**: Puppeteer-inspired abstractions for common tasks
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- Keyboard and mouse simulation
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- Element interaction and querying
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- Wait for elements to appear
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- Pure CDP implementation (no JavaScript injection)
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## Basic Example
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The example below demonstrates the salient features of the library by navigating to a
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web page and extracting the document title.
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print(html)
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```
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## High-Level Utilities Example
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The library also provides high-level utilities for common automation tasks:
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```python
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from trio_cdp import open_cdp, page, target
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from trio_cdp.util import query_selector, Keyboard
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async with open_cdp(cdp_url) as conn:
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async with conn.open_session(target_id) as session:
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# Navigate to a page
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await page.enable()
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await page.navigate(url)
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# Find an input field and type into it
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input_field = await query_selector(session, 'input[name="search"]')
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if input_field:
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await input_field.type('Hello, World!')
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# Press Enter to submit
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keyboard = Keyboard(session)
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await keyboard.press('Enter')
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```
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This example code is explained [in the documentation](https://trio-cdp.readthedocs.io)
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and more example code can be found in the `examples/` directory of this repository,
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including examples for taking screenshots and monitoring network events.

‎UTILITIES_IMPLEMENTATION.md‎

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# Utilities Module Implementation Summary
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## Overview
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This implementation addresses the GitHub issue about extending `trio-chrome-devtools-protocol` with higher-level utility functions and classes for common browser automation tasks, inspired by Puppeteer/Pyppeteer.
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## Decision: Integrated Approach
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Rather than creating a separate `trio-puppeteer` package, the utilities are integrated directly into the main `trio_cdp` package as a `util` module. This approach was chosen because:
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1. **Lightweight**: The utilities are thin wrappers around CDP commands
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2. **No External Dependencies**: Everything uses native CDP, no JavaScript injection
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3. **Tight Integration**: Direct access to session and connection objects
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4. **Simplicity**: Users don't need to install/manage a separate package
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## Implementation
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### New Module: `trio_cdp/util.py`
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Contains three main classes and utility functions:
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#### 1. Keyboard Class
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Provides keyboard input simulation:
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- `down(key, text=None)` - Press key down
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- `up(key)` - Release key
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- `press(key, delay=0)` - Complete key press (down + up)
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- `type(text, delay=0)` - Type a string character by character
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**Example:**
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```python
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keyboard = Keyboard(session)
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await keyboard.type("Hello, World!")
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await keyboard.press("Enter")
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```
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#### 2. Mouse Class
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Provides mouse action simulation:
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- `move(x, y, steps=1)` - Move mouse with optional smooth interpolation
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- `click(x, y, button='left', click_count=1, delay=0)` - Click at position
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- `down(button='left', click_count=1)` - Mouse button down
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- `up(button='left', click_count=1)` - Mouse button up
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**Example:**
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```python
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mouse = Mouse(session)
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await mouse.move(100, 200, steps=10) # Smooth movement
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await mouse.click(100, 200)
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```
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#### 3. ElementHandle Class
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Represents a handle to a DOM element with convenient interaction methods:
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- `click(button='left', click_count=1, delay=0)` - Click the element
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- `type(text, delay=0)` - Focus and type into element
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- `get_attribute(name)` - Get HTML attribute value
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- `get_property(name)` - Get JavaScript property value
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- `get_text_content()` - Extract text content
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**Example:**
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```python
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input_field = await query_selector(session, 'input[name="email"]')
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if input_field:
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await input_field.type('user@example.com')
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```
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#### Element Selection Functions
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- `query_selector(session, selector, node_id=None)` - Find first matching element
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- `query_selector_all(session, selector, node_id=None)` - Find all matching elements
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- `wait_for_selector(session, selector, timeout=30, visible=False)` - Wait for element
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**Example:**
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```python
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# Find and interact with elements
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button = await query_selector(session, 'button.submit')
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if button:
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await button.click()
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# Wait for dynamic content
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result = await wait_for_selector(session, '.result', timeout=10, visible=True)
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```
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## Documentation
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### Added Files
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1. **docs/utilities.rst** - Comprehensive documentation for all utilities
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2. **examples/form_interaction.py** - Example showing form interaction
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3. **examples/keyboard_mouse.py** - Example demonstrating keyboard/mouse usage
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4. **tests/test_util.py** - Unit tests for utility functions
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5. **validate_utilities.py** - Validation script to verify module structure
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### Updated Files
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1. **README.md** - Added utilities section with examples
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2. **docs/index.rst** - Added utilities to documentation table of contents
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3. **trio_cdp/__init__.py** - Export util module
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## Key Design Principles
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1. **Pure CDP**: No JavaScript injection, all interactions use native CDP commands
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2. **Async-First**: Fully compatible with Trio's async/await patterns
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3. **Lightweight**: Minimal abstractions, close to underlying CDP
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4. **Type-Safe**: Complete type hints for IDE support
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5. **Composable**: Small, focused utilities that work well together
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6. **Optional**: Core CDP functionality remains available; utilities are opt-in
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## Benefits
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### For Users
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- **Intuitive API**: Familiar patterns for anyone coming from Puppeteer
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- **Less Boilerplate**: Common tasks simplified with high-level methods
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- **Type Safety**: Full IDE support with autocomplete and type checking
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- **Pure Python**: No JavaScript knowledge required
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### For the Project
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- **Maintains Philosophy**: Stays true to lightweight, CDP-focused approach
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- **No Breaking Changes**: Completely additive, existing code unaffected
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- **Extensible**: Users can easily add custom utilities following same patterns
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- **Well-Documented**: Comprehensive docs and examples
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## Technical Details
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### Generator Fix
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Fixed `generator/generate.py` to handle `typing.Optional` type hints, which was preventing regeneration of CDP bindings with newer Python versions.
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### CDP Bindings Regenerated
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Regenerated all CDP binding code to be compatible with `chrome-devtools-protocol==0.4.0`, resolving import errors with the generated code.
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## Testing & Validation
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1. **Unit Tests**: Comprehensive test suite in `tests/test_util.py`
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2. **Validation Script**: `validate_utilities.py` verifies all classes and methods exist
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3. **Code Quality**: Passed CodeQL security scan with 0 alerts
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4. **Examples**: Two working examples demonstrate real-world usage
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## Usage Example
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Here's a complete example showing the utilities in action:
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```python
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import trio
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from trio_cdp import open_cdp, page, target
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from trio_cdp.util import query_selector, wait_for_selector, Keyboard
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async def automate_form(cdp_url):
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async with open_cdp(cdp_url) as conn:
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# Get a target
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targets = await target.get_targets()
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target_id = targets[0].target_id
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async with conn.open_session(target_id) as session:
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# Navigate
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await page.enable()
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await page.navigate('https://example.com/form')
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# Wait for and fill form
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name_field = await wait_for_selector(session, 'input[name="name"]', timeout=10)
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if name_field:
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await name_field.type('John Doe')
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# Use keyboard for submission
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keyboard = Keyboard(session)
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await keyboard.press('Enter')
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```
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## Future Enhancements
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Potential additions that maintain the same design philosophy:
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1. **Page utilities**: Screenshot helpers, PDF generation utilities
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2. **Network utilities**: Request interception helpers, mock response utilities
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3. **Cookie utilities**: Easy cookie management
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4. **Dialog utilities**: Alert/prompt/confirm handlers
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5. **File upload**: File chooser utilities
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Each would follow the same pattern: lightweight wrappers around CDP commands with convenient async interfaces.
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## Conclusion
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This implementation successfully extends `trio-chrome-devtools-protocol` with higher-level utilities while maintaining the library's core principles of being lightweight, pure-CDP, and Trio-native. The utilities provide a more intuitive interface for common automation tasks without sacrificing the power and flexibility of the underlying CDP protocol.

‎docs/index.rst‎

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installation
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getting_started
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api
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utilities
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changelog

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