Wire Sud upload/download into the brewpi_gui client

Adds File menu actions to save the running Sud's schedule to a local
sud.json and to replace it from one, via the Sud websocket channel's
new Download/Upload messages. File dialogs are opened up front on the
GUI thread; the actual read/write happens off the websocket recv
callback, which runs on a worker thread and must not touch Qt itself.

main_window.py is regenerated from brewpi.ui via pyuic5 5.15.11, which
also picks up an unrelated pre-existing drift (the default URI had
fallen out of sync with the .ui source).

client/brewpi_gui.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 from main_window import Ui_MainWindow
 from PyQt5 import QtWidgets, QtGui
+import json
 import sys
 from ws.client.ws_client import WsClient
 from ws.message import MessageDispatcherSync
@@ -22,16 +23,20 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 		self.msg_heater = self.msg_dispatch.msgio_get('Heater')
 		self.msg_stirrer = self.msg_dispatch.msgio_get('Stirrer')
 		self.msg_tempctrl = self.msg_dispatch.msgio_get('TempCtrl')
+		self.msg_sud = self.msg_dispatch.msgio_get('Sud')
 
 		self.msg_pot.set_recv_handler(self.on_pot_changed)
 		self.msg_sensor.set_recv_handler(self.on_sensor_changed)
 		self.msg_heater.set_recv_handler(self.on_heater_changed)
 		self.msg_stirrer.set_recv_handler(self.on_stirrer_changed)
 		self.msg_tempctrl.set_recv_handler(self.on_tempctrl_changed)
+		self.msg_sud.set_recv_handler(self.on_sud_changed)
 
 		self.setupUi(self)
 		self.actionStart.triggered.connect(self.connect)
 		self.actionStop.triggered.connect(self.disconnect)
+		self.actionSudDownload.triggered.connect(self.on_action_sud_download)
+		self.actionSudUpload.triggered.connect(self.on_action_sud_upload)
 		self.Slider_pwr_soll.valueChanged.connect(self.on_slider_pwr_soll_changed)
 		self.Slider_temp_soll.valueChanged.connect(self.on_slider_temp_soll_changed)
 		self.Slider_speed_soll.valueChanged.connect(self.on_slider_stirrer_speed_soll_changed)
@@ -48,6 +53,7 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 		self.checkbox_heater_activate_initial_update = True
 		self.checkbox_stirrer_activate_initial_update = True
 		self.heatrate_soll_initial_update = True
+		self.sud_download_path = None
 
 	def connect(self):
 		self.slider_pwr_initial_update = True
@@ -86,6 +92,24 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 		print("on_checkbox_stirrer_activate_changed {}".format(value))
 		self.msg_stirrer.send({'Activate': int(value == 2)})
 
+	def on_action_sud_download(self):
+		# Pick the destination up front, on the GUI thread - the actual
+		# write happens in on_sud_changed(), which runs off a worker thread
+		# and must not touch Qt (e.g. open a file dialog) itself.
+		path, _ = QtWidgets.QFileDialog.getSaveFileName(self, "Download Sud", filter="JSON files (*.json)")
+		if not path:
+			return
+		self.sud_download_path = path
+		self.msg_sud.send({'Download': True})
+
+	def on_action_sud_upload(self):
+		path, _ = QtWidgets.QFileDialog.getOpenFileName(self, "Upload Sud", filter="JSON files (*.json)")
+		if not path:
+			return
+		with open(path) as f:
+			data = json.load(f)
+		self.msg_sud.send({'Upload': data})
+
 	def on_pot_changed(self, msg):
 		print("on_pot_changed {}".format(msg))
 		for key in msg:
@@ -160,6 +184,16 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 					self.Slider_speed_soll.setMinimum(int(submsg['Min']))
 					self.Slider_speed_soll.setMaximum(int(submsg['Max']))
 
+	def on_sud_changed(self, msg):
+		print("on_sud_changed {}".format(msg))
+		for key in msg:
+			if "Json" in key and self.sud_download_path:
+				with open(self.sud_download_path, 'w') as f:
+					json.dump(msg['Json'], f, indent='\t')
+				self.sud_download_path = None
+			elif "Name" in key:
+				self.statusBar().showMessage("Sud schedule updated: {}".format(msg['Name']), 5000)
+
 	def closeEvent(self, event):
 		print("Exitting gracefully!")
 		self.ws_client.disconnect()