Add Cura.API.connectionStatus

CURA-7437

cura/API/ConnectionStatus.py

@@ -0,0 +1,64 @@
+from typing import Optional
+
+from PyQt5.QtCore import QObject, pyqtSignal, QTimer, pyqtProperty
+from PyQt5.QtNetwork import QNetworkReply
+
+from UM.TaskManagement.HttpRequestManager import HttpRequestManager
+from cura.UltimakerCloud import UltimakerCloudAuthentication
+
+
+class ConnectionStatus(QObject):
+    """Status info for some web services"""
+
+    UPDATE_INTERVAL = 5.0  # seconds
+    ULTIMAKER_CLOUD_STATUS_URL = UltimakerCloudAuthentication.CuraCloudAPIRoot + "/connect/v1/"
+
+    __instance = None  # type: Optional[ConnectionStatus]
+
+    internetReachableChanged = pyqtSignal()
+    umCloudReachableChanged = pyqtSignal()
+
+    @classmethod
+    def getInstance(cls, *args, **kwargs) -> "ConnectionStatus":
+        if cls.__instance is None:
+            cls.__instance = cls(*args, **kwargs)
+        return cls.__instance
+
+    def __init__(self, parent: Optional["QObject"] = None):
+        super().__init__(parent)
+
+        self._http = HttpRequestManager.getInstance()
+        self._statuses = {
+            self.ULTIMAKER_CLOUD_STATUS_URL: True,
+            "http://example.com": True
+        }
+
+        # Create a timer for automatic updates
+        self._update_timer = QTimer()
+        self._update_timer.setInterval(int(self.UPDATE_INTERVAL * 1000))
+        # The timer is restarted automatically
+        self._update_timer.setSingleShot(False)
+        self._update_timer.timeout.connect(self._update)
+        self._update_timer.start()
+
+    @pyqtProperty(bool, notify=internetReachableChanged)
+    def isInternetReachable(self) -> bool:
+        # Is any of the test urls reachable?
+        return any(self._statuses.values())
+
+    def _update(self):
+        for url in self._statuses.keys():
+            self._http.get(
+                url = url,
+                callback = self._statusCallback,
+                error_callback = self._statusCallback,
+                timeout = 5
+            )
+
+    def _statusCallback(self, reply: QNetworkReply, error: QNetworkReply.NetworkError = None):
+        url = reply.request().url().toString()
+        prev_statuses = self._statuses.copy()
+        self._statuses[url] = HttpRequestManager.replyIndicatesSuccess(reply, error)
+
+        if any(self._statuses.values()) != any(prev_statuses.values()):
+            self.internetReachableChanged.emit()

cura/API/__init__.py

@@ -5,6 +5,7 @@ from typing import Optional, TYPE_CHECKING
 from PyQt5.QtCore import QObject, pyqtProperty
 
 from cura.API.Backups import Backups
+from cura.API.ConnectionStatus import ConnectionStatus
 from cura.API.Interface import Interface
 from cura.API.Account import Account
 
@@ -45,6 +46,8 @@ class CuraAPI(QObject):
         # Backups API
         self._backups = Backups(self._application)
 
+        self._connectionStatus = ConnectionStatus()
+
         # Interface API
         self._interface = Interface(self._application)
 
@@ -55,6 +58,10 @@ class CuraAPI(QObject):
     def account(self) -> "Account":
         return self._account
 
+    @pyqtProperty(QObject, constant = True)
+    def connectionStatus(self) -> "ConnectionStatus":
+        return self._connectionStatus
+
     @property
     def backups(self) -> "Backups":
         return self._backups