### Create Secure SSL/TLS Server with uvloop

Source: https://context7.com/magicstack/uvloop.git/llms.txt

This example demonstrates setting up a secure TCP server with SSL/TLS encryption using uvloop and asyncio. It configures an `ssl.SSLContext` with a certificate and key, then starts a server using `asyncio.start_server`. The `handle_secure_client` coroutine processes incoming secure connections. Dependencies: `asyncio`, `ssl`, `uvloop`.

```python
import asyncio
import ssl
import uvloop

async def handle_secure_client(reader, writer):
    data = await reader.read(1024)
    writer.write(data)
    await writer.drain()
    writer.close()
    await writer.wait_closed()

async def main():
    # Create SSL context
    ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
    ssl_context.load_cert_chain('ssl_cert.pem', 'ssl_key.pem')
    ssl_context.check_hostname = False
    ssl_context.verify_mode = ssl.CERT_NONE

    # Start server with SSL
    server = await asyncio.start_server(
        handle_secure_client,
        '127.0.0.1', 8443,
        ssl=ssl_context
    )

    print("Secure server running on port 8443")

    async with server:
        await server.serve_forever()

uvloop.run(main())
```

--------------------------------

### Install uvloop using pip

Source: https://github.com/magicstack/uvloop.git/blob/master/docs/user/index.md

Installs the uvloop library from PyPI. Requires Python 3.8 or later. This command-line instruction is used for system-level installation.

```console
pip install uvloop
```

--------------------------------

### Use uvloop with Aiohttp and Gunicorn

Source: https://github.com/magicstack/uvloop.git/wiki/Home

This example demonstrates how to use uvloop with aiohttp and gunicorn by specifying a custom worker class. This method automatically sets up uvloop without manual policy installation.

```bash
gunicorn ... --worker-class aiohttp.worker.GunicornUVLoopWebWorker
```

--------------------------------

### Build uvloop from source

Source: https://github.com/magicstack/uvloop.git/blob/master/README.rst

This snippet outlines the steps to build uvloop from its source repository. It includes cloning the repository, setting up a virtual environment, installing development dependencies, and finally building and testing the project using `make`.

```bash
$ git clone --recursive git@github.com:MagicStack/uvloop.git
$ cd uvloop

$ python3 -m venv uvloop-dev
$ source uvloop-dev/bin/activate

$ pip install -e .[dev]

$ make
$ make test
```

--------------------------------

### Legacy uvloop Installation Method (Deprecated)

Source: https://context7.com/magicstack/uvloop.git/llms.txt

This snippet shows a legacy installation method for uvloop, compatible with Python 3.11 and earlier. This method is deprecated starting from Python 3.12. It simply prints a message indicating uvloop is running. Dependencies: `asyncio`, `sys`, `uvloop`.

```python
import asyncio
import sys
import uvloop

async def main():
    print("Running with uvloop")
    await asyncio.sleep(0.1)

```

--------------------------------

### Use uvloop with Tornado

Source: https://github.com/magicstack/uvloop.git/wiki/Home

This snippet illustrates how to use uvloop with the Tornado framework by installing the uvloop event policy before initializing Tornado's asyncio main loop. It ensures uvloop is used for Tornado's event handling.

```python
from tornado.platform.asyncio import AsyncIOMainLoop
import asyncio
import uvloop

asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
AsyncIOMainLoop().install()
asyncio.get_event_loop().run_forever()
```

--------------------------------

### Set uvloop as the asyncio event loop policy

Source: https://github.com/magicstack/uvloop.git/blob/master/docs/user/index.md

Configures asyncio to use uvloop's high-performance event loop by default. This is the recommended way to integrate uvloop for general use. It requires importing both 'asyncio' and 'uvloop'.

```python
import asyncio
import uvloop
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
```

--------------------------------

### Create and set a uvloop event loop manually

Source: https://github.com/magicstack/uvloop.git/blob/master/docs/user/index.md

Manually creates an instance of uvloop's event loop and sets it as the current asyncio event loop. This method offers more granular control over loop instantiation. It requires importing 'asyncio' and 'uvloop'.

```python
import asyncio
import uvloop
loop = uvloop.new_event_loop()
asyncio.set_event_loop(loop)
```

--------------------------------

### Run asyncio application with uvloop

Source: https://github.com/magicstack/uvloop.git/blob/master/README.rst

This snippet demonstrates the preferred method for running an asyncio application using uvloop's `run()` helper function. It configures asyncio to use uvloop, passing along any additional arguments like `debug`.

```python
import uvloop

async def main():
    # Main entry-point.
    ...

uvloop.run(main())
```

--------------------------------

### Alternative uvloop usage for Python < 3.11

Source: https://github.com/magicstack/uvloop.git/blob/master/README.rst

This snippet shows an alternative method for using uvloop with Python versions 3.11 and earlier. It conditionally uses `asyncio.Runner` for newer versions and falls back to `uvloop.install()` for older ones, ensuring compatibility.

```python
import asyncio
import sys

import uvloop

async def main():
    # Main entry-point.
    ...

if sys.version_info >= (3, 11):
    with asyncio.Runner(loop_factory=uvloop.new_event_loop) as runner:
        runner.run(main())
else:
    uvloop.install()
    asyncio.run(main())
```

--------------------------------

### Create Protocol-Based TCP Server with uvloop

Source: https://context7.com/magicstack/uvloop.git/llms.txt

This snippet demonstrates how to create a low-level protocol-based TCP server using uvloop. It implements an EchoProtocol that echoes received data back to the client. This approach avoids the overhead of streams, making it suitable for high-performance networking. Dependencies include `asyncio` and `uvloop`.

```python
import asyncio
import uvloop

class EchoProtocol(asyncio.Protocol):
    def connection_made(self, transport):
        self.transport = transport
        self.peername = transport.get_extra_info('peername')
        print(f"Connection from {self.peername}")

    def data_received(self, data):
        # Echo data back immediately
        self.transport.write(data)

    def connection_lost(self, exc):
        print(f"Connection closed: {self.peername}")
        self.transport = None

async def main():
    loop = asyncio.get_running_loop()

    # Create server with protocol factory
    server = await loop.create_server(
        EchoProtocol,
        '127.0.0.1', 7777
    )

    addr = server.sockets[0].getsockname()
    print(f"Protocol server on {addr}")

    async with server:
        await server.serve_forever()

uvloop.run(main())
```

--------------------------------

### Run asyncio code with uvloop

Source: https://context7.com/magicstack/uvloop.git/llms.txt

Provides a simple entry point for running coroutines using the uvloop event loop. This is the recommended method for most use cases, automatically configuring asyncio.run() to use uvloop. It accepts coroutines and optional debug mode.

```python
import uvloop
import asyncio

async def main():
    # Your async application logic
    print("Running with uvloop!")
    await asyncio.sleep(1)
    return "Complete"

# Run with uvloop - automatically configures asyncio.run() to use uvloop
result = uvloop.run(main())

# Enable debug mode
result = uvloop.run(main(), debug=True)
```

--------------------------------

### Manage File Descriptors with uvloop add_reader/add_writer

Source: https://context7.com/magicstack/uvloop.git/llms.txt

This code snippet illustrates low-level file descriptor monitoring using uvloop's `add_reader` and `add_writer`. It creates a socket pair for inter-process communication and sets up callbacks to handle data reception and transmission. This is useful for event-driven I/O on file descriptors. Dependencies: `asyncio`, `socket`, `uvloop`.

```python
import asyncio
import socket
import uvloop

async def main():
    loop = asyncio.get_running_loop()

    # Create socket pair for IPC
    rsock, wsock = socket.socketpair()

    result = asyncio.Future()

    def reader():
        data = rsock.recv(100)
        print(f"Received: {data}")
        loop.remove_reader(rsock)
        result.set_result(data)

    def writer():
        wsock.send(b'Hello via file descriptors!')
        loop.remove_writer(wsock)

    try:
        # Register callbacks for socket events
        loop.add_reader(rsock, reader)
        loop.add_writer(wsock, writer)

        # Wait for communication to complete
        data = await result
        print(f"Communication complete: {data}")
    finally:
        rsock.close()
        wsock.close()

uvloop.run(main())
```

--------------------------------

### Run Asyncio with uvloop for Python 3.11 and earlier

Source: https://context7.com/magicstack/uvloop.git/llms.txt

This snippet demonstrates how to use uvloop with asyncio, adapting to Python version differences. For Python 3.11 and earlier, it uses `asyncio.Runner` with `uvloop.new_event_loop`. For Python 3.12+, it falls back to the default asyncio behavior, as `uvloop.install()` is deprecated.

```python
import asyncio
import uvloop
import sys

async def main():
    # Your main async logic here
    pass

if sys.version_info >= (3, 11):
    with asyncio.Runner(loop_factory=uvloop.new_event_loop) as runner:
        runner.run(main())
else:
    # Install uvloop as default event loop policy
    uvloop.install()  # Deprecated in 3.12+
    asyncio.run(main())
```

--------------------------------

### Create and manage uvloop event loop manually

Source: https://context7.com/magicstack/uvloop.git/llms.txt

Demonstrates manual creation and management of a uvloop event loop instance. This approach is suitable for advanced scenarios where explicit control over the event loop lifecycle is required. It involves creating a new loop, setting it as the current loop, running coroutines, and ensuring the loop is closed.

```python
import asyncio
import uvloop

# Create a new uvloop event loop instance
loop = uvloop.new_event_loop()

# Set it as the current event loop
asyncio.set_event_loop(loop)

async def task():
    await asyncio.sleep(0.1)
    return "Task complete"

try:
    # Run coroutine until complete
    result = loop.run_until_complete(task())
    print(result)
finally:
    # Clean up
    loop.close()
```

--------------------------------

### Low-level socket operations with uvloop

Source: https://context7.com/magicstack/uvloop.git/llms.txt

Demonstrates performing low-level socket operations using the `loop.sock_*` methods provided by uvloop. This offers maximum control over socket interactions, including accepting connections, receiving data, and sending data back. It's designed for scenarios requiring fine-grained network programming.

```python
import asyncio
import socket
import uvloop

async def echo_server(loop, address):
    # Create and configure server socket
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind(address)
    sock.listen(5)
    sock.setblocking(False)

    print(f"Server listening at {address}")

    with sock:
        while True:
            # Accept client connection
            client, addr = await loop.sock_accept(sock)
            print(f"Connection from {addr}")

            # Handle client in separate task
            loop.create_task(handle_client(loop, client))

async def handle_client(loop, client):
    client.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)

    with client:
        while True:
            # Receive data
            data = await loop.sock_recv(client, 65536)
            if not data:
                break

            # Send data back
            await loop.sock_sendall(client, data)

async def main():
    loop = asyncio.get_running_loop()
    await echo_server(loop, ('127.0.0.1', 9999))

uvloop.run(main())
```

--------------------------------

### Implement Buffered Protocol for Zero-Copy Operations with uvloop

Source: https://context7.com/magicstack/uvloop.git/llms.txt

This code defines an advanced protocol using pre-allocated buffers for zero-copy I/O operations with uvloop. The `EchoBufferedProtocol` utilizes `get_buffer` to provide a pre-allocated buffer and `buffer_updated` to write received data back efficiently. This minimizes data copying for high-throughput applications. Dependencies: `asyncio`, `uvloop`.

```python
import asyncio
import uvloop

class EchoBufferedProtocol(asyncio.BufferedProtocol):
    def __init__(self):
        # Pre-allocate buffer for zero-copy reads
        self.buffer = bytearray(256 * 1024)

    def connection_made(self, transport):
        self.transport = transport

    def get_buffer(self, sizehint):
        # Return pre-allocated buffer
        return self.buffer

    def buffer_updated(self, nbytes):
        # Write received bytes back (buffer is updated in-place)
        self.transport.write(self.buffer[:nbytes])

    def connection_lost(self, exc):
        self.transport = None

async def main():
    loop = asyncio.get_running_loop()

    server = await loop.create_server(
        EchoBufferedProtocol,
        '127.0.0.1', 6666
    )

    async with server:
        await server.serve_forever()

uvloop.run(main())
```

--------------------------------

### Perform Asynchronous Socket Client Operations with uvloop

Source: https://context7.com/magicstack/uvloop.git/llms.txt

This snippet showcases asynchronous client-side socket operations using uvloop. It demonstrates connecting to a remote server, sending a large chunk of data, and receiving the response. The code uses `loop.sock_connect`, `loop.sock_sendall`, and `loop.sock_recv` for non-blocking socket interactions. Handles `ConnectionRefusedError`. Dependencies: `asyncio`, `socket`, `uvloop`.

```python
import asyncio
import socket
import uvloop

async def tcp_client():
    # Create non-blocking socket
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setblocking(False)

    loop = asyncio.get_running_loop()

    try:
        # Connect to server
        await loop.sock_connect(sock, ('127.0.0.1', 8888))

        # Send data
        message = b'Hello, Server!' * 1000
        await loop.sock_sendall(sock, message)

        # Receive response
        response = b''
        while len(response) < len(message):
            chunk = await loop.sock_recv(sock, 4096)
            if not chunk:
                break
            response += chunk

        print(f"Received {len(response)} bytes")
        return response

    except ConnectionRefusedError:
        print("Connection refused")
    finally:
        sock.close()

uvloop.run(tcp_client())
```

--------------------------------

### TCP server with asyncio streams using uvloop

Source: https://context7.com/magicstack/uvloop.git/llms.txt

Implements a high-level, stream-based TCP server that handles concurrent client connections efficiently using uvloop. It defines a handler for each client connection, allowing for reading data and echoing it back. The server is configured to listen on a specified address and port.

```python
import asyncio
import uvloop

async def handle_client(reader, writer):
    # Get client address
    addr = writer.get_extra_info('peername')
    print(f"Connection from {addr}")

    try:
        # Read data from client
        data = await reader.read(1000000)
        if data:
            # Echo data back
            writer.write(data)
            await writer.drain()
    finally:
        writer.close()
        await writer.wait_closed()

async def main():
    # Start TCP server on localhost:8888
    server = await asyncio.start_server(
        handle_client,
        '127.0.0.1', 8888
    )

    addr = server.sockets[0].getsockname()
    print(f"Server listening on {addr}")

    async with server:
        await server.serve_forever()

uvloop.run(main())
```

--------------------------------

### Set uvloop as Default Event Loop Policy (Deprecated)

Source: https://context7.com/magicstack/uvloop.git/llms.txt

This code demonstrates how to manually set uvloop as the default event loop policy for asyncio. Note that `asyncio.set_event_loop_policy` is deprecated and `uvloop.run()` is the recommended approach for newer projects.

```python
import asyncio
import uvloop

# Set uvloop as the default event loop policy (deprecated)
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())

# Now all asyncio.run() calls will use uvloop
async def task1():
    await asyncio.sleep(0.1)
    return "Task 1"

async def task2():
    await asyncio.sleep(0.1)
    return "Task 2"

# These will use uvloop automatically
result1 = asyncio.run(task1())
result2 = asyncio.run(task2())

print(result1, result2)
```

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