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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 = 10.0 # 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()
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