chess-pyspec 1.0.4

Python SPEC modules and tools

Test status badge

PySpec

PySpec is a Python implementation of the SPEC server and client protocol, providing tools for remote control, data acquisition, and automation in scientific instrumentation environments. It enables Python-based clients to interact with a SPEC server, control motors, read/write variables, and execute commands or functions remotely.

Features

• Async client-server architecture for high-performance remote control
• Remote property and function access (read/write variables, call functions)
• Motor control and status monitoring
• Associative array and data array support

Installation

PySpec requires Python 3.9+ and depends on cython, h5py, numpy, and pyee.

pip install chess-pyspec

# or for development
git clone https://github.com/Verdant-Evolution/chess-pyspec
cd chess-pyspec
pip install -e .[dev]

Quick Start

Connecting as a Client

import asyncio
from pyspec.client import Client

async def main():
    async with Client("127.0.0.1", 6510) as client:
        # Get a reference to "var/foo" on the server.
        foo = client.var("foo", int)
        await foo.set(42)
        value = await foo.get()
        print("foo:", value) # foo: 42

        result = await client.call("add", 2, 3)
        print("add(2, 3):", result)


        # Wait for properties to be set to specific values
        await foo.wait_for(15, timeout=10)


asyncio.run(main())

Motor Control Example

async with Client("127.0.0.1", 6510) as client:
    motor = client.motor("theta")

    # Read and write motor properties and parameters
    await motor.sign.get()
    await motor.offset.get()
    await motor.position.get()
    ...

    # Move motors on the server
    async with motor:
        await motor.move(10.0)
        pos = await motor.position.get()
        print("Motor position:", pos) # "Motor position: 10.0"

Output Streaming Example

async with Client("127.0.0.1", 6510) as client:
    async with client.output("tty").capture() as lines:
        await client.exec('print("Hello, world!")')
    print(lines[-1])  # Should print 'Hello, world!\n'

Starting a Server

from pyspec.server import Server, Property, remote_function
import asyncio

class MyServer(Server):
    foo = Property[int]("foo", 0)

    @remote_function
    def add(self, a: str, b: str):
        return float(a) + float(b)

async def main():
    async with MyServer(host="127.0.0.1", port=6510, test_mode=True) as server:
        await server.serve_forever()

asyncio.run(main())

Hardware servers currently support properties and remote function calls. Connect with a PySpec or spec client to interface with a PySpec server.

Currently unsupported server features:

1. Associative Arrays
2. Motor Protocols (through ../start_one or ../start_all )

Testing

Run the test suite with:

pytest

Documentation

See the docs/ directory for full API documentation and usage details.

License

See LICENSE or the source headers for license details. Portions copyright Certified Scientific Software.