4 files changed, 180 insertions, 0 deletions
diff --git a/vk/utils/tracking/db/backend/__init__.py b/vk/utils/tracking/db/backend/__init__.py
new file mode 100644
index 0000000..4b3c278
--- /dev/null
+++ b/vk/utils/tracking/db/backend/__init__.py
@@ -0,0 +1,5 @@
+# Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is licensed under the terms of the MIT License.
+# See LICENSE.txt for details.
+
+__all__ = 'csv', 'log', 'null'
diff --git a/vk/utils/tracking/db/backend/csv.py b/vk/utils/tracking/db/backend/csv.py
new file mode 100644
index 0000000..10a504f
--- /dev/null
+++ b/vk/utils/tracking/db/backend/csv.py
@@ -0,0 +1,63 @@
+# Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is licensed under the terms of the MIT License.
+# See LICENSE.txt for details.
+
+from collections.abc import Iterable
+import csv
+
+from ..record import Record
+from ..timestamp import Timestamp
+
+class Writer:
+    def __init__(self, fd):
+        self._fd = fd
+        self._writer = csv.writer(fd, lineterminator='\n')
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        pass
+
+    def on_initial_status(self, user):
+        self._write_record(user)
+        self._fd.flush()
+
+    def on_status_update(self, user):
+        self._write_record(user)
+        self._fd.flush()
+
+    def on_connection_error(self, e):
+        pass
+
+    def _write_record(self, user):
+        if not self:
+            return
+        self._write_row(self._record_to_row(Record.from_user(user)))
+
+    def _write_row(self, row):
+        self._writer.writerow(row)
+
+    @staticmethod
+    def _record_to_row(record):
+        return [str(record.get_timestamp())] + [str(record[field]) for field in record]
+
+class Reader(Iterable):
+    def __init__(self, fd):
+        self._reader = csv.reader(fd)
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        pass
+
+    def __iter__(self):
+        return map(Reader._record_from_row, self._reader)
+
+    @staticmethod
+    def _record_from_row(row):
+        record = Record(Timestamp.from_string(row[0]))
+        for i in range(len(Record.FIELDS)):
+            record[Record.FIELDS[i]] = row[i + 1]
+        return record
diff --git a/vk/utils/tracking/db/backend/log.py b/vk/utils/tracking/db/backend/log.py
new file mode 100644
index 0000000..625257b
--- /dev/null
+++ b/vk/utils/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))
diff --git a/vk/utils/tracking/db/backend/null.py b/vk/utils/tracking/db/backend/null.py
new file mode 100644
index 0000000..139a9f0
--- /dev/null
+++ b/vk/utils/tracking/db/backend/null.py
@@ -0,0 +1,37 @@
+# Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is licensed under the terms of the MIT License.
+# See LICENSE.txt for details.
+
+from collections.abc import Iterable
+
+class Writer:
+    def __init__(self, fd):
+        pass
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        pass
+
+    def on_initial_status(self, user):
+        pass
+
+    def on_status_update(self, user):
+        pass
+
+    def on_connection_error(self, e):
+        pass
+
+class Reader(Iterable):
+    def __init__(self, fd):
+        pass
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        pass
+
+    def __iter__(self):
+        pass