web.py

from http.server import BaseHTTPRequestHandler, HTTPServer
import libamp
import argparse
from urllib.parse import urlparse, parse_qsl
from functools import partial


class Server(BaseHTTPRequestHandler):
    def __init__(self, pin, model, *args, **kwargs):
        self.pin = pin
        self.model = model
        super().__init__(*args, **kwargs)

    def do_GET(self):

        qs = dict(parse_qsl(urlparse(self.path).query))
        command = qs["cmd"]
        repeat = 1
        if "repeat" in qs:
            repeat = qs["repeat"]

        try:
            libamp.execute(self.pin, command, repeat, model=self.model)
            self.send_response(200)
            self.end_headers()
            self.wfile.write(bytes("OK", "utf-8"))
        except Exception as err:
            self.send_response(500)
            self.end_headers()
            self.wfile.write(bytes("Error: {0}".format(err), "utf-8"))


def run(port, pin, model):
    server_address = ("", port)
    handler = partial(Server, pin, model)
    httpd = HTTPServer(server_address, handler)

    print("Starting Cambridge Audio %s amplifier web control on port %d..." % (model, port))
    httpd.serve_forever()


parser = argparse.ArgumentParser(
    description="Web server for Cambridge Audio amplifiers control"
)
parser.add_argument("--pin", nargs="?", default=4, type=int)
parser.add_argument("--port", nargs="?", default=9696, type=int)
parser.add_argument("--model", default="540A", choices=libamp.all_models)
args = parser.parse_args()

run(port=args.port, pin=args.pin, model=args.model)