power: make the module more modular

Signed-off-by:  Pawel Zubrycki <paw.zubr@gmail.com>

moonraker/plugins/power.py

@@ -34,15 +34,7 @@ class PrinterPower:
         logging.info("Power plugin loading devices: " + str(dev_names))
         devices = {}
         for dev in dev_names:
-            pin = config.getint(dev + "_pin")
+            devices[dev] = GpioDevice(dev, config)
-            name = config.get(dev + "_name", dev)
-            active_low = config.getboolean(dev + "_active_low", False)
-            devices[dev] = {
-                "name": name,
-                "pin": pin,
-                "active_low": int(active_low),
-                "status": None
-            }
         ioloop = IOLoop.current()
         ioloop.spawn_callback(self.initialize_devices, devices)
 
@@ -50,7 +42,7 @@ class PrinterPower:
         output = {"devices": []}
         for dev in self.devices:
             output['devices'].append({
-                "name": self.devices[dev]["name"],
+                "name": self.devices[dev].name,
                 "id": dev
             })
         return output
@@ -65,25 +57,21 @@ class PrinterPower:
         result = {}
         req = path.split("/")[-1]
         for dev in args:
-            if path.startswith("/machine/gpio_power/"):
+            if req not in ("on", "off", "status"):
-                res = await self._power_dev(dev, req)
-                if res:
-                    result[dev] = self.devices[dev]["status"]
-                else:
-                    result[dev] = "device_not_found"
-            else:
                 raise self.server.error("Unsupported power request")
+            if (await self._power_dev(dev, req)):
+                result[dev] = self.devices[dev].status
+            else:
+                result[dev] = "device_not_found"
         return result
 
     async def _power_dev(self, dev, req):
         if dev not in self.devices:
             return False
 
-        await GPIO.verify_pin(self.devices[dev]["pin"],
-                              self.devices[dev]["active_low"])
         if req in ["on", "off"]:
-            val = 1 if req == "on" else 0
+            await self.devices[dev].power(req)
-            GPIO.set_pin_value(self.devices[dev]["pin"], val)
+
             self.server.send_event("gpio_power:power_changed", {
                 "device": dev,
                 "status": req
@@ -91,17 +79,13 @@ class PrinterPower:
         elif req != "status":
             raise self.server.error("Unsupported power request")
 
-        self.devices[dev]["status"] = GPIO.is_pin_on(
+        await self.devices[dev].refresh_status()
-            self.devices[dev]["pin"])
         return True
 
     async def initialize_devices(self, devices):
         for name, device in devices.items():
             try:
-                logging.debug(
+                await device.initialize()
-                    f"Attempting to configure pin GPIO{device['pin']}")
-                await GPIO.setup_pin(device["pin"], device["active_low"])
-                device["status"] = GPIO.is_pin_on(device["pin"])
             except Exception:
                 logging.exception(
                     f"Power plugin: ERR Problem configuring the output pin for"
@@ -123,6 +107,11 @@ class PrinterPower:
         ioloop = IOLoop.current()
         ioloop.spawn_callback(self._power_dev, device, status)
 
+    async def add_device(self, dev, device):
+        await device.initialize()
+        self.devices[dev] = device
+
+
 class GPIO:
     gpio_root = "/sys/class/gpio"
 
@@ -187,7 +176,6 @@ class GPIO:
         if GPIO._get_gpio_option(pin, "direction").strip() != "out":
             GPIO._set_gpio_option(pin, "direction", "out")
 
-
     @staticmethod
     def is_pin_on(pin):
         return "on" if int(GPIO._get_gpio_option(pin, "value")) else "off"
@@ -198,5 +186,25 @@ class GPIO:
         GPIO._set_gpio_option(pin, "value", value)
 
 
+class GpioDevice:
+    def __init__(self, dev, config):
+        self.name = config.get(dev + "_name", dev)
+        self.status = None
+        self.pin = config.getint(dev + "_pin")
+        self.active_low = int(config.getboolean(dev + "_active_low", False))
+
+    async def initialize(self):
+        logging.debug(f"Attempting to configure pin GPIO{self.pin}")
+        await GPIO.setup_pin(self.pin, self.active_low)
+        await self.refresh_status()
+
+    async def refresh_status(self):
+        self.status = GPIO.is_pin_on(self.pin)
+
+    async def power(self, status):
+        await GPIO.verify_pin(self.pin, self.active_low)
+        GPIO.set_pin_value(self.pin, int(status == "on"))
+
+
 def load_plugin(config):
     return PrinterPower(config)