easy-asocket 0.1.2

A user-friendly asynchronous socket wrapper with a simple communication protocol, currently available for Python and C++.

easy-asocket

A user-friendly asynchronous socket wrapper with a simple communication protocol, currently available for Python and C++.

Version

Current Version: 0.1.2

Changelog

[0.1.2] - Current

• Add support for Boost 1.87 and later.

Features

• Asynchronous I/O: Built on Python's asyncio for high-performance network communication
• Simple Protocol: Lightweight application-layer protocol with CRC16 checksum validation
• Request-Response Pattern: Built-in support for request-response communication with automatic message ID management
• Multi-Client Server: Server can handle multiple concurrent client connections
• Cross-Language Support: Available for both Python and C++

Installation

pip install easy-asocket

Quick Start

Server Example

import asyncio
from easy_asocket import SocketServer, SimpleProtocol

def on_request(pkg: SimpleProtocol, client_id: int):
    """Callback function to handle received requests"""
    print(f'Received data from client {client_id}:')
    print(f'  Message ID: {pkg.get_msgid()}')
    print(f'  CMD: {pkg.get_cmd()}')
    print(f'  Data: {pkg.get_data()}')
    
    # Create and send response
    resp = SimpleProtocol()
    resp.set_msgid(pkg.get_msgid())  # Use same message ID
    resp.set_cmd(pkg.get_cmd())      # Use same command
    resp.set_data(b'Response data')  # Set response data
    
    # Send response asynchronously
    asyncio.create_task(server.response(resp, client_id))

async def main():
    server = SocketServer(22334)
    server.set_request_callback(on_request)
    await server.start()

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

Client Example

import asyncio
import easy_asocket as eas

def on_request(pkg: eas.SimpleProtocol):
    """Callback function to handle received requests from server"""
    print(f"Received request:")
    print(f"  Message ID: {pkg.get_msgid()}")
    print(f"  CMD: {pkg.get_cmd()}")
    print(f"  Data: {pkg.get_data()}")

async def main():
    client = eas.SocketClient("127.0.0.1", 22334)
    
    # Set callback to handle received requests
    client.set_request_callback(on_request)
    
    # Connect to server
    await client.connect()
    
    # Send a request and wait for response
    pkg = eas.SimpleProtocol()
    pkg.set_cmd(0x0001)
    pkg.set_data(b'Hello, Server!')
    
    success, response = await client.request(pkg, expect_response=True, timeout=5.0)
    if success:
        print(f"Response received: {response.get_data()}")
    
    # Keep connection alive
    await asyncio.sleep(3600)  # Keep running for 1 hour

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

API Reference

SocketServer

Server class for accepting multiple client connections.

Methods

• __init__(port: int): Initialize server on specified port
• set_request_callback(callback: Callable[[SimpleProtocol, int], None]): Set callback function to handle incoming requests. The callback receives the protocol package and client ID.
• async start(): Start the server and begin accepting connections
• async stop(): Stop the server and close all connections
• get_clients() -> dict[int, ClientSession]: Get a snapshot of all connected clients
• async response(pkg: SimpleProtocol, client_id: int): Send a response to a specific client
• async request(pkg: SimpleProtocol, client_id: int, expect_response: bool = False, timeout: float = 5.0): Send a request to a specific client

SocketClient

Client class for connecting to a server.

Methods

• __init__(host: str, port: int): Initialize client with server address
• set_request_callback(callback: Callable[[SimpleProtocol], None]): Set callback function to handle incoming requests from server
• async connect(): Connect to the server
• async disconnect(): Disconnect from the server
• async request(pkg: SimpleProtocol, expect_response: bool = False, timeout: float = 5.0) -> Tuple[bool, SimpleProtocol]: Send a request. Returns (success, response) tuple.
• async response(pkg: SimpleProtocol): Send a response

SimpleProtocol

Protocol class for encoding and decoding messages.

Methods

• set_msgid(msg_id: int): Set message ID
• get_msgid() -> int: Get message ID
• set_cmd(cmd: int): Set command code
• get_cmd() -> int: Get command code
• set_direction(direction: int): Set direction (DIRECTION_REQUEST or DIRECTION_RESPONSE)
• get_direction() -> int: Get direction
• set_data(data: bytes): Set data payload
• get_data() -> bytes: Get data payload (reference)
• get_data_copy() -> bytes: Get data payload (copy)
• encode() -> bytes: Encode protocol data into byte array
• decode(data: bytes) -> bool: Decode byte array into protocol data. Returns True if successful.

Constants

• DIRECTION_REQUEST = 0x00: Request direction
• DIRECTION_RESPONSE = 0x01: Response direction

Protocol Format

The SimpleProtocol uses the following structure:

[Header(2)][Direction(1)][MessageID(2)][Length(4)][CMD(2)][Data(N)][CRC16(2)][Footer(2)]

• Header: 0xAA 0x55
• Direction: 0x00 (request) or 0x01 (response)
• MessageID: 16-bit unsigned integer
• Length: 32-bit unsigned integer (data length)
• CMD: 16-bit unsigned integer (command code)
• Data: Variable length byte array
• CRC16: 16-bit CRC checksum
• Footer: 0x55 0xAA

C++ Support

The library also provides C++ headers and implementation files with the same API as Python. To get the C++ include directory path:

easy-asocket-cppdir

This will print the path to the C++ headers directory, which you can use in your CMake configuration.

C++ Server Example

#include "simple_protocol.hpp"
#include "simple_protocol_impl.hpp"
#include "easy_asocket.hpp"
#include "easy_asocket_impl.hpp"
#include <boost/asio.hpp>
#include <iostream>
#include <thread>

int main() {
    auto io_ctx = EasyASocket::get_global_io_ctx();
    EasyASocket::SocketServer server(22334, io_ctx);
    
    // Set callback to handle incoming requests
    server.set_request_callback([](EasyASocket::SimpleProtocol &pkg, size_t client_id) {
        std::cout << "Received request from client " << client_id << std::endl;
        std::cout << "  Message ID: " << pkg.get_msgid() << std::endl;
        std::cout << "  CMD: " << pkg.get_cmd() << std::endl;
        
        // Create and send response
        EasyASocket::SimpleProtocol resp;
        resp.set_msgid(pkg.get_msgid());
        resp.set_cmd(pkg.get_cmd());
        std::vector<uint8_t> resp_data{'R', 'e', 's', 'p', 'o', 'n', 's', 'e'};
        resp.set_data(resp_data);
        
        server.response(resp, client_id);
    });
    
    server.start();
    EasyASocket::run_ctx_backend();
    
    // Keep running
    std::this_thread::sleep_for(std::chrono::hours(1));
    return 0;
}

C++ Client Example

#include "simple_protocol.hpp"
#include "simple_protocol_impl.hpp"
#include "easy_asocket.hpp"
#include "easy_asocket_impl.hpp"
#include <boost/asio.hpp>
#include <iostream>
#include <thread>

int main() {
    auto io_ctx = EasyASocket::get_global_io_ctx();
    EasyASocket::SocketClient client("127.0.0.1", 22334, io_ctx);
    
    // Set callback to handle incoming requests
    client.set_request_callback([](EasyASocket::SimpleProtocol &pkg) {
        std::cout << "Received request from server" << std::endl;
        std::cout << "  Message ID: " << pkg.get_msgid() << std::endl;
        std::cout << "  CMD: " << pkg.get_cmd() << std::endl;
    });
    
    // Wait for connection
    std::this_thread::sleep_for(std::chrono::milliseconds(100));
    
    // Send a request and wait for response
    EasyASocket::SimpleProtocol pkg;
    pkg.set_cmd(0x0001);
    std::vector<uint8_t> data{'H', 'e', 'l', 'l', 'o'};
    pkg.set_data(data);
    
    auto [success, response] = client.request(pkg, true, 5000);
    if (success) {
        std::cout << "Response received" << std::endl;
    }
    
    // Keep running
    std::this_thread::sleep_for(std::chrono::hours(1));
    return 0;
}

Dependencies

The C++ implementation requires Boost.Asio library. Make sure you have Boost installed on your system before using the C++ headers.

Installing Boost

Ubuntu/Debian:

sudo apt-get install libboost-all-dev

macOS (using Homebrew):

brew install boost

Windows (using vcpkg):

vcpkg install boost-asio

CMake Configuration

When using CMake, you can find Boost and link against it:

find_package(Boost REQUIRED COMPONENTS system)
target_link_libraries(your_target PRIVATE Boost::system)

C++ API Reference

The C++ API is designed to match the Python API as closely as possible. All classes and methods are in the EasyASocket namespace.

SocketServer

• SocketServer(uint16_t port, std::shared_ptr<asio::io_context> io_ctx = nullptr): Initialize server on specified port
• void start(): Start the server and begin accepting connections
• void stop(): Stop the server and close all connections
• void set_request_callback(std::function<void(SimpleProtocol &p, size_t client_id)> callback): Set callback function to handle incoming requests
• std::unordered_map<size_t, std::shared_ptr<ClientSession>> get_clients() const: Get a snapshot of all connected clients
• void response(SimpleProtocol &p, size_t client_id): Send a response to a specific client
• std::tuple<bool, SimpleProtocol> request(SimpleProtocol &p, size_t client_id, bool expect_response = false, uint32_t timeout = 5000): Send a request to a specific client

SocketClient

• SocketClient(std::string host, uint16_t port, std::shared_ptr<asio::io_context> io_ctx = nullptr): Initialize client with server address (automatically connects)
• void set_request_callback(std::function<void(SimpleProtocol &p)> callback): Set callback function to handle incoming requests from server
• std::tuple<bool, SimpleProtocol> request(SimpleProtocol &p, bool expect_response = false, uint32_t timeout = 5000): Send a request. Returns (success, response) tuple.
• void response(SimpleProtocol &p): Send a response
• bool is_connected() const: Check if the client is connected

SimpleProtocol

• void set_msgid(uint16_t msg_id): Set message ID
• uint16_t get_msgid(): Get message ID
• void set_cmd(uint16_t cmd): Set command code
• uint16_t get_cmd(): Get command code
• void set_direction(uint8_t direction): Set direction (DIRECTION_REQUEST or DIRECTION_RESPONSE)
• uint8_t get_direction(): Get direction
• void set_data(std::vector<uint8_t> data): Set data payload
• void set_data(char *data, uint32_t length): Set data payload from C-style array
• std::vector<uint8_t> &get_data(): Get data payload (reference)
• std::vector<uint8_t> get_data_copy(): Get data payload (copy)
• std::vector<uint8_t> encode(): Encode protocol data into byte array
• static std::tuple<bool, SimpleProtocol> decode(const std::vector<uint8_t> &bytearray): Decode byte array into protocol data

Global Functions

• std::shared_ptr<asio::io_context> get_global_io_ctx(): Get or create global io_context
• void run_ctx_backend(): Run the io_context in a background thread
• void stop_ctx(): Stop the io_context backend thread
• void set_terminal_verbose(bool enabled): Enable/disable verbose terminal output
• bool get_terminal_verbose(): Get verbose terminal output status

License

MIT License

Author

Red Elephant ([e-mail])