1 files changed, 75 insertions, 0 deletions
diff --git a/vk/tracking/db/backend/log.py b/vk/tracking/db/backend/log.py
new file mode 100644
index 0000000..625257b
--- /dev/null
+++ b/vk/tracking/db/backend/log.py
@@ -0,0 +1,75 @@
+# Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is licensed under the terms of the MIT License.
+# See LICENSE.txt for details.
+
+import logging
+
+class Writer:
+    def __init__(self, fd):
+        self._logger = logging.getLogger(__file__)
+        self._logger.setLevel(logging.INFO)
+        handler = logging.StreamHandler(fd)
+        handler.setFormatter(logging.Formatter(
+            fmt='[%(asctime)s] %(message)s',
+            datefmt='%Y-%m-%d %H:%M:%S'))
+        self._logger.addHandler(handler)
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        pass
+
+    def info(self, msg):
+        self._logger.info(msg)
+
+    def exception(self, e):
+        self._logger.exception(e)
+
+    def on_initial_status(self, user):
+        if user.is_online():
+            self.info(self._format_user_is_online(user))
+        else:
+            self.info(self._format_user_is_offline(user))
+        self.info(self._format_user_last_seen(user))
+
+    def on_status_update(self, user):
+        if user.is_online():
+            self.info(self._format_user_went_online(user))
+        else:
+            self.info(self._format_user_went_offline(user))
+        self.info(self._format_user_last_seen(user))
+
+    def on_connection_error(self, e):
+        #self.exception(e)
+        pass
+
+    @staticmethod
+    def _format_user(user):
+        if user.has_last_name():
+            return '{} {}'.format(user.get_first_name(), user.get_last_name())
+        else:
+            return '{}'.format(user.get_first_name())
+
+    @staticmethod
+    def _format_user_is_online(user):
+        return '{} is ONLINE.'.format(Writer._format_user(user))
+
+    @staticmethod
+    def _format_user_is_offline(user):
+        return '{} is OFFLINE.'.format(Writer._format_user(user))
+
+    @staticmethod
+    def _format_user_last_seen(user):
+        return '{} was last seen at {} using {}.'.format(
+            Writer._format_user(user),
+            user.get_last_seen_time_local(),
+            user.get_last_seen_platform().get_description_for_sentence())
+
+    @staticmethod
+    def _format_user_went_online(user):
+        return '{} went ONLINE.'.format(Writer._format_user(user))
+
+    @staticmethod
+    def _format_user_went_offline(user):
+        return '{} went OFFLINE.'.format(Writer._format_user(user))