Setup relay controller, includes db for saving state

Pin represents rpi gpio pin & controls is string describing what the relay controls.
Any state change is save to sqlite database.

brewRelay.py

@@ -0,0 +1,60 @@
+import RPi.GPIO as GPIO
+from logger import logger
+import sqlite3
+
+class BrewRelay():
+    def __init__(self, pin, controls):
+#        GPIO.setmode(GPIO.BOARD)
+        self.pin = pin
+        self.controls = controls
+
+        self.conn = sqlite3.connect('brew.db', check_same_thread=False)
+        self.cur = self.conn.cursor()
+
+        GPIO.setup(self.pin, GPIO.OUT)
+        self.set(self.state, True)
+
+    @property
+    def state(self):
+        query = 'select state from relay where pin = {}'.format(self.pin) 
+        self.cur.execute(query)
+
+        return True if self.cur.fetchone()[0] == 1 else False
+
+    def saveStateToDB(self, state):
+        query = 'update relay set state = {} where pin = {}'
+        self.cur.execute(query.format(state, self.pin))
+        self.conn.commit()
+
+    def set(self, state, setup=False):
+        GPIO.output(self.pin, not state) # for some reason this is negated
+        if setup is False:
+            logger.info('Relay toggled', es={'relayState': state, 'relayType': self.controls})
+        else:
+            logger.info('Resuming relay state', es={'relayState': state, 'relayType': self.controls})
+
+        self.saveStateToDB(state)
+
+    def toggle(self):
+        self.set(not state)
+
+    @staticmethod
+    def fromYaml(loader, node):
+        return BrewRelay(**loader.construct_mapping(node))
+
+    @staticmethod
+    def getRelayByWhatItControls(relays, controls):
+        return next(( relay for relay in relays if relay.controls == controls), None)
+
+    def __exit__(self):
+        self.conn.close()
+
+if __name__ == '__main__':
+    brewRelay = BrewRelay()
+
+    import time
+    while True:
+        print('toggling!')
+        brewRelay.toggle()
+        time.sleep(1)
+