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authorEgor Tensin <Egor.Tensin@gmail.com>2021-05-03 21:40:30 +0300
committerEgor Tensin <Egor.Tensin@gmail.com>2021-05-03 21:40:30 +0300
commit7638522df30e6ef24ab3f76a529b135e58fa25a1 (patch)
tree77ee74fe6caefad5274da324eef83e4bdeb6779e /vk/tracking/status.py
parentvk.tracking: merge online_sessions into sessions (diff)
downloadvk-scripts-7638522df30e6ef24ab3f76a529b135e58fa25a1.tar.gz
vk-scripts-7638522df30e6ef24ab3f76a529b135e58fa25a1.zip
vk.tracking: status_tracker -> status
Diffstat (limited to 'vk/tracking/status.py')
-rw-r--r--vk/tracking/status.py139
1 files changed, 139 insertions, 0 deletions
diff --git a/vk/tracking/status.py b/vk/tracking/status.py
new file mode 100644
index 0000000..a16a34e
--- /dev/null
+++ b/vk/tracking/status.py
@@ -0,0 +1,139 @@
+# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "VK scripts" project.
+# For details, see https://github.com/egor-tensin/vk-scripts.
+# Distributed under the MIT License.
+
+from collections.abc import Callable
+import contextlib
+import time
+import signal
+
+import vk.error
+from vk.user import UserField
+
+
+class StatusTracker:
+ DEFAULT_TIMEOUT = 5
+
+ def __init__(self, api, timeout=DEFAULT_TIMEOUT):
+ self._api = api
+ self._timeout = timeout
+ self._on_initial_status = []
+ self._on_status_update = []
+ self._on_connection_error = []
+
+ def _wait_after_connection_error(self):
+ time.sleep(self._timeout)
+
+ def add_database_writer(self, writer):
+ self.add_initial_status_handler(writer.on_initial_status)
+ self.add_status_update_handler(writer.on_status_update)
+ self.add_connection_error_handler(writer.on_connection_error)
+
+ def add_initial_status_handler(self, fn):
+ self._assert_is_callback(fn)
+ self._on_initial_status.append(fn)
+
+ def add_status_update_handler(self, fn):
+ self._assert_is_callback(fn)
+ self._on_status_update.append(fn)
+
+ def add_connection_error_handler(self, fn):
+ self._assert_is_callback(fn)
+ self._on_connection_error.append(fn)
+
+ @staticmethod
+ def _assert_is_callback(fn):
+ if not isinstance(fn, Callable):
+ raise TypeError()
+
+ _USER_FIELDS = UserField.DOMAIN, UserField.ONLINE, UserField.LAST_SEEN,
+
+ def _query_status(self, uids):
+ user_list = self._api.users_get(uids, self._USER_FIELDS,
+ deactivated_users=False)
+ return {user.get_uid(): user for user in user_list}
+
+ def _notify_status(self, user):
+ for fn in self._on_initial_status:
+ fn(user)
+
+ def _notify_status_update(self, user):
+ for fn in self._on_status_update:
+ fn(user)
+
+ def _notify_connection_error(self, e):
+ for fn in self._on_connection_error:
+ fn(e)
+
+ def _query_initial_status(self, uids):
+ while True:
+ try:
+ return self._query_status(uids)
+ except vk.error.APIConnectionError as e:
+ self._notify_connection_error(e)
+ self._wait_after_connection_error()
+
+ def _query_status_updates(self, uids):
+ while True:
+ self._wait_after_connection_error()
+ try:
+ return self._query_status(uids)
+ except vk.error.APIConnectionError as e:
+ self._notify_connection_error(e)
+
+ @staticmethod
+ def _filter_status_updates(old_users, new_users):
+ for uid, user in new_users.items():
+ if old_users[uid].is_online() != user.is_online():
+ old_users[uid] = user
+ yield user
+
+ def query_status(self, uids):
+ users = self._query_initial_status(uids)
+ for user in users.values():
+ self._notify_status(user)
+ return users
+
+ def _do_loop(self, uids):
+ users = self.query_status(uids)
+ while True:
+ updated_users = self._query_status_updates(uids)
+ for user in self._filter_status_updates(users, updated_users):
+ self._notify_status_update(user)
+
+ class StopLooping(RuntimeError):
+ pass
+
+ @staticmethod
+ def _stop_looping(signo, frame):
+ raise StatusTracker.StopLooping()
+
+ @staticmethod
+ @contextlib.contextmanager
+ def _handle_signal(signo, handler):
+ old_handler = signal.getsignal(signo)
+ signal.signal(signo, handler)
+ try:
+ yield
+ finally:
+ signal.signal(signal.SIGINT, old_handler)
+
+ @staticmethod
+ def _handle_sigint():
+ # Python doesn't raise KeyboardInterrupt in case a real SIGINT is sent
+ # from outside, surprisingly.
+ return StatusTracker._handle_signal(signal.SIGINT,
+ StatusTracker._stop_looping)
+
+ @staticmethod
+ def _handle_sigterm():
+ return StatusTracker._handle_signal(signal.SIGTERM,
+ StatusTracker._stop_looping)
+
+ def loop(self, uids):
+ with self._handle_sigint(), self._handle_sigterm():
+ try:
+ self._do_loop(uids)
+ except (KeyboardInterrupt, StatusTracker.StopLooping):
+ pass