### Install Project Dependencies

Source: https://github.com/thatxliner/aioudp/blob/main/CONTRIBUTING.md

Use Poetry to install all necessary development dependencies for the project.

```bash
$ poetry install
```

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

### Install aioudp

Source: https://github.com/thatxliner/aioudp/blob/main/docs/quickstart.md

Install the aioudp library using pip.

```bash
$ pip install aioudp
```

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

### Install AioUDP with Poetry

Source: https://github.com/thatxliner/aioudp/blob/main/README.md

Use this command to add the AioUDP library to your project if you are using Poetry for dependency management.

```bash
$ poetry add aioudp
```

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

### AioUDP Echo Server Example

Source: https://github.com/thatxliner/aioudp/blob/main/README.md

This snippet demonstrates how to set up an echo server using AioUDP. It handles incoming messages and sends them back to the client. It also includes signal handling for graceful shutdown.

```Python
import asyncio
import signal

import aioudp


async def main():
    async def handler(connection):
        async for message in connection:
            await connection.send(message)

    loop = asyncio.get_running_loop()
    stop = loop.create_future()
    # Optional. This is for properly exiting the server when Ctrl-C is pressed
    # or when the process is killed/terminated
    loop.add_signal_handler(signal.SIGTERM, stop.set_result, None)
    loop.add_signal_handler(signal.SIGINT, stop.set_result, None)

    # Serve the server
    async with aioudp.serve("localhost", 9999, handler):
        await stop  # Serve forever

if __name__ == '__main__':
    asyncio.run(main())
```

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

### AioUDP Client Example

Source: https://github.com/thatxliner/aioudp/blob/main/README.md

This snippet shows how to create a UDP client using AioUDP. It connects to a server, sends a message, and asserts that the received message matches the sent message.

```Python
import asyncio

import aioudp


async def main():
    async with aioudp.connect("localhost", 9999) as connection:
        await connection.send(b"Hello world!")
        assert await connection.recv() == b"Hello world!"

if __name__ == '__main__':
    asyncio.run(main())
```

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

### aioudp.serve

Source: https://github.com/thatxliner/aioudp/blob/main/docs/api_ref.md

Run a UDP server. This function starts a UDP server on the specified host and port, and uses the provided handler to process incoming connections.

```APIDOC
## aioudp.serve

Run a UDP server.
See the docs for an example UDP echo server

### Method
- **Parameters:**
  - **host** (str) – The host name/address to run the server on
  - **port** (int) – The port number to run the server on
  - **handler** (Callable[[Connection], Awaitable[None]]) – An asynchronous function to handle a request. It should accept an instance of `Connection` and doesn’t need to return anything.
  - **queue_size** (int | None) – The maximum size of the message queue used internally. Defaults to None, meaning an unlimited size. Unless you know for sure what you’re doing, there is no need to change this value.
  - **kwargs** – Additional keyword arguments to pass to loop.create_datagram_endpoint
- **Returns:** An asynchronous iterator yielding None.
- **SEE ALSO:** [`connect()`](#aioudp.connect)
```

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

### Run Project Tests with Pytest

Source: https://github.com/thatxliner/aioudp/blob/main/CONTRIBUTING.md

Alternatively, run the project's tests using Poetry and Pytest if Poe the poet is not installed.

```bash
$ poetry run pytest
```

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

### Example of Test Class Structure

Source: https://github.com/thatxliner/aioudp/blob/main/CONTRIBUTING.md

Illustrates the recommended structure for test classes in Pytest. If a test class is the only one in a file, its tests should be unwrapped.

```python
# test_connection.py

class TestConnection:
    def test_can_con(self): ...
    def test_con_ends_gracefully(self):...
```

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

### Add Timeout to Async Function

Source: https://github.com/thatxliner/aioudp/blob/main/docs/faq.md

Use asyncio.wait_for to add a timeout to an asynchronous function. This is a general asyncio pattern, not specific to aioudp. The example demonstrates catching asyncio.TimeoutError.

```python
try:
    await asyncio.wait_for(func(), timeout=0.01)
except asyncio.TimeoutError:
    print("timeout!")
```

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

### Simple UDP Echo Server

Source: https://github.com/thatxliner/aioudp/blob/main/docs/index.md

Sets up a UDP echo server that listens on localhost:9999. It echoes back any received messages. The server runs indefinitely until interrupted.

```python
import asyncio

import aioudp


async def main():
    async def handler(connection):
        async for message in connection:
            await connection.send(message)

    async with aioudp.serve("localhost", 9999, handler):
        await asyncio.Future()  # Serve forever


if __name__ == "__main__":
    asyncio.run(main())
```

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

### Format Code with Poe

Source: https://github.com/thatxliner/aioudp/blob/main/CONTRIBUTING.md

Apply code formatting to the project using the 'poe format' command.

```bash
$ poe format
```

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

### Run Project Tests

Source: https://github.com/thatxliner/aioudp/blob/main/CONTRIBUTING.md

Execute the project's test suite using the Poe the poet tool.

```bash
$ poe test
```

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

### PA System Client Implementation

Source: https://github.com/thatxliner/aioudp/blob/main/docs/quickstart.md

This Python code implements the client side of a simple PA system using aioudp and PyAudio. It connects to a server, sends audio input, and handles server responses.

```python
import asyncio

import pyaudio

import aioudp

DECLINE = b"\x01"
TERMINATOR = b"DONE"


async def main() -> None:
    # Configuration for PyAudio
    CHUNK = 1024
    FORMAT = pyaudio.paInt16
    CHANNELS = 1
    RATE = 44100

    # Let's connect to my Raspberry Pi on the local network
    async with aioudp.connect("raspberrypi", 9999) as connection:
        if await connection.recv() == DECLINE:
            print("Someone else is already using the PA system :(")
            return

        # Again, some PyAudio black magic.
        # This time set up for input
        p = pyaudio.PyAudio()
        stream = p.open(
            format=FORMAT,
            channels=CHANNELS,
            input=True,
            rate=RATE,
            frames_per_buffer=CHUNK,
        )
        # Continue recording and stream recording
        # Until CTRL-C
        try:
            while True:
                await connection.send(stream.read(CHUNK))
        except KeyboardInterrupt:
            await connection.send(TERMINATOR)

        # De-init PyAudio
        stream.stop_stream()
        stream.close()
        p.terminate()


if __name__ == "__main__":
    asyncio.run(main())

```

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

### PA System Server Implementation

Source: https://github.com/thatxliner/aioudp/blob/main/docs/quickstart.md

This Python code implements the server side of a simple PA system using aioudp and PyAudio. It handles incoming connections, plays audio data, and ensures only one user can transmit at a time.

```python
import asyncio
import signal

import pyaudio

import aioudp

# Doesn't have to be "\x00" and "\x01". Any unique value would do
ACCEPT = b"\x00"
DECLINE = b"\x01"
TERMINATOR = b"DONE"  # Could be anything that will never be audio data
connections = set()


async def main():
    # Configuration for PyAudio
    CHUNK = 1024
    FORMAT = pyaudio.paInt16
    CHANNELS = 1
    RATE = 44100

    async def handler(connection: aioudp.Connection) -> None:
        # Make sure only one person uses the PA at a time
        if connections:
            await connection.send(DECLINE)
            return
        await connection.send(ACCEPT)
        connections.add(None)

        # PyAudio initialization black magic
        p = pyaudio.PyAudio()
        stream = p.open(
            format=FORMAT,
            channels=CHANNELS,
            output=True,
            frames_per_buffer=CHUNK,
            rate=RATE,
        )

        async for data in connection:
            # Until b"DONE" is recieved, play the data
            if data == TERMINATOR:
                break
            stream.write(data)

        # Uninitalize PyAudio stuff
        stream.stop_stream()
        stream.close()
        p.terminate()

        connections.remove(None)

    loop = asyncio.get_running_loop()
    stop = loop.create_future()
    # This way, we can CTRl-C it properly
    loop.add_signal_handler(signal.SIGINT, stop.set_result, None)

    # "0.0.0.0" to expose globally. Serve at port 9999
    async with aioudp.serve("0.0.0.0", 9999, handler):
        await stop


if __name__ == "__main__":
    asyncio.run(main())

```

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

### Simple UDP Client

Source: https://github.com/thatxliner/aioudp/blob/main/docs/index.md

A UDP client that connects to localhost:9999, sends a byte message, and asserts that the echoed response matches the sent message. Requires a running server.

```python
import asyncio

import aioudp


async def main():
    async with aioudp.connect("localhost", 9999) as connection:
        await connection.send(b"Hello world!")
        assert await connection.recv() == b"Hello world!"


if __name__ == "__main__":
    asyncio.run(main())
```

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

### Format Code with Shed

Source: https://github.com/thatxliner/aioudp/blob/main/CONTRIBUTING.md

An alternative command to format Python files using 'shed'.

```bash
$ shed {{ cookiecutter.module_name }}/**.py
```

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

### Run Linters

Source: https://github.com/thatxliner/aioudp/blob/main/CONTRIBUTING.md

Execute the project's linters using the 'poe lint' command.

```bash
$ poe lint
```

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

### aioudp.connect

Source: https://github.com/thatxliner/aioudp/blob/main/docs/api_ref.md

Connect to a UDP server. This function returns an asynchronous iterator that yields a connection object for interacting with the UDP server.

```APIDOC
## aioudp.connect

Connect to a UDP server.

### Method
- **Parameters:**
  - **host** (str) – The server’s host name/address.
  - **port** (int) – The server’s port number.
  - **queue_size** (int | None) – The maximum size of the message queue used internally. Defaults to None, meaning an unlimited size. Unless you know for sure what you’re doing, there is no need to change this value.
  - **kwargs** – Additional keyword arguments to pass to loop.create_datagram_endpoint
- **Returns:** An asynchronous iterator yielding a connection to the UDP server.
- **SEE ALSO:** [`serve()`](#aioudp.serve)
```

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

### aioudp.Connection

Source: https://github.com/thatxliner/aioudp/blob/main/docs/api_ref.md

Represents a server-client connection in aioudp. It provides methods to send and receive data, and properties to access local and remote addresses. Connections should not be instantiated manually.

```APIDOC
## aioudp.Connection

Represents a server-client connection. Do not instantiate manually.

### Properties
#### local_address
- **Returns:** This is a tuple containing the hostname and port
- **Return type:** tuple[str, int]

#### remote_address
- **Returns:** This is a tuple containing the hostname and port
- **Return type:** tuple[str, int]

### Methods
#### async recv() -> bytes
Receives a message from the connection.
- **Returns:** The received bytes.
- **Return type:** bytes
- **Raises:**
  - [exceptions.ConnectionClosedError](#aioudp.exceptions.ConnectionClosedError) – The connection is closed

#### async send(data: bytes) -> None
Send a message to the connection.
The reason why this send function is async is due to API consistency. There is actually no underlying async call so feel free to just forgo the await.
WARNING: Since this is UDP, there is no guarantee that the message will be sent.
- **Parameters:**
  - **data** (bytes) – The message in bytes to send
- **Raises:**
  - [exceptions.ConnectionClosedError](#aioudp.exceptions.ConnectionClosedError) – The connection is closed
  - ValueError – There is no data to send
```

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

### Unwrapped Test Functions

Source: https://github.com/thatxliner/aioudp/blob/main/CONTRIBUTING.md

Shows the unwrapped structure for test functions when a test class is not necessary.

```python
# test_connection.py

def test_can_con():...
def test_con_ends_gracefully():...
```

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