Source code for camcops_server.cc_modules.cc_device

#!/usr/bin/env python



    Copyright (C) 2012-2020 Rudolf Cardinal (

    This file is part of CamCOPS.

    CamCOPS is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    CamCOPS is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with CamCOPS. If not, see <>.


**Representation of the client devices.**


from typing import Optional, TYPE_CHECKING

from cardinal_pythonlib.classes import classproperty
from pendulum import DateTime as Pendulum
from sqlalchemy.orm import Query, relationship, Session as SqlASession
from sqlalchemy.sql.schema import Column, ForeignKey
from sqlalchemy.sql.sqltypes import Boolean, DateTime, Integer, Text

from camcops_server.cc_modules.cc_constants import DEVICE_NAME_FOR_SERVER
from camcops_server.cc_modules.cc_report import Report
from camcops_server.cc_modules.cc_unittest import DemoDatabaseTestCase
from camcops_server.cc_modules.cc_user import User
from camcops_server.cc_modules.cc_sqla_coltypes import (
from camcops_server.cc_modules.cc_sqlalchemy import Base
from camcops_server.cc_modules.cc_version import CAMCOPS_SERVER_VERSION

    from camcops_server.cc_modules.cc_request import CamcopsRequest

# =============================================================================
# Device class
# =============================================================================

[docs]class Device(Base): """ Represents a tablet (client) device. """ __tablename__ = "_security_devices" id = Column( "id", Integer, primary_key=True, autoincrement=True, comment="ID of the source tablet device" ) name = Column( "name", DeviceNameColType, unique=True, index=True, comment="Short cryptic unique name of the source tablet device" ) registered_by_user_id = Column( "registered_by_user_id", Integer, ForeignKey(""), comment="ID of user that registered the device" ) registered_by_user = relationship("User", foreign_keys=[registered_by_user_id]) when_registered_utc = Column( "when_registered_utc", DateTime, comment="Date/time when the device was registered (UTC)" ) friendly_name = Column( "friendly_name", Text, comment="Friendly name of the device" ) camcops_version = Column( "camcops_version", SemanticVersionColType, comment="CamCOPS version number on the tablet device" ) last_upload_batch_utc = Column( "last_upload_batch_utc", DateTime, comment="Date/time when the device's last upload batch started (UTC)" ) ongoing_upload_batch_utc = Column( "ongoing_upload_batch_utc", DateTime, comment="Date/time when the device's ongoing upload batch " "started (UTC)" ) uploading_user_id = Column( "uploading_user_id", Integer, ForeignKey(""), comment="ID of user in the process of uploading right now" ) uploading_user = relationship("User", foreign_keys=[uploading_user_id]) currently_preserving = Column( "currently_preserving", Boolean, default=False, comment="Preservation currently in progress" )
[docs] @classmethod def get_device_by_name(cls, dbsession: SqlASession, device_name: str) -> Optional['Device']: """ Returns a device by its name. """ if not device_name: return None device = ( dbsession.query(cls) .filter( == device_name) .first() ) # type: Optional[Device] return device
[docs] @classmethod def get_device_by_id(cls, dbsession: SqlASession, device_id: int) -> Optional['Device']: """ Returns a device by its integer ID. """ if device_id is None: return None device = ( dbsession.query(cls) .filter( == device_id) .first() ) # type: Optional[Device] return device
[docs] @classmethod def get_server_device(cls, dbsession: SqlASession) -> "Device": """ Return the special device meaning "the server", creating it if it doesn't already exist. """ device = cls.get_device_by_name(dbsession, DEVICE_NAME_FOR_SERVER) if device is None: device = Device() = DEVICE_NAME_FOR_SERVER device.friendly_name = "CamCOPS server" device.registered_by_user = User.get_system_user(dbsession) device.when_registered_utc = Pendulum.utcnow() device.camcops_version = CAMCOPS_SERVER_VERSION dbsession.add(device) dbsession.flush() # So that we can use the PK elsewhere return device
[docs] def get_friendly_name(self) -> str: """ Get the device's friendly name (or failing that, its name). """ if self.friendly_name is None: return return self.friendly_name
[docs] def get_friendly_name_and_id(self) -> str: """ Get a formatted representation of the device (name, ID, friendly name). """ if self.friendly_name is None: return return f"{} (device# {}, {self.friendly_name})"
[docs] def get_id(self) -> int: """ Get the device's integer ID. """ return
[docs] def is_valid(self) -> bool: """ Having instantiated an instance with ``Device(device_id)``, this function reports whether it is a valid device, i.e. is it in the database? """ return is not None
# ============================================================================= # Reports # =============================================================================
[docs]class DeviceReport(Report): """ Report to show registered devices. This is a superuser-only report, so we do not override superuser_only. """ # noinspection PyMethodParameters @classproperty def report_id(cls) -> str: return "devices"
[docs] @classmethod def title(cls, req: "CamcopsRequest") -> str: _ = req.gettext return _("(Server) Devices registered with the server")
[docs] def get_query(self, req: "CamcopsRequest") -> Query: dbsession = req.dbsession query = ( dbsession.query(,, Device.registered_by_user_id, Device.when_registered_utc, Device.friendly_name, Device.camcops_version, Device.last_upload_batch_utc) .order_by( ) return query
# ============================================================================= # Unit tests # =============================================================================
[docs]class DeviceTests(DemoDatabaseTestCase): """ Unit tests. """ def test_device(self) -> None: self.announce("test_device") q = self.dbsession.query(Device) d = q.first() # type: Device assert d, "Missing Device in demo database!" self.assertIsInstance(d.get_friendly_name(), str) self.assertIsInstance(d.get_id(), int) self.assertIsInstance(d.is_valid(), bool)