From 584a6d93ad1fe1ba46929108f002a16a8b70e95d Mon Sep 17 00:00:00 2001
From: Ivan Alejandro <ivanalejandro0@gmail.com>
Date: Fri, 5 Jun 2015 13:36:51 -0300
Subject: [feat] add a zmq based logger, change log window

- Add a new handler for a zmq/thread-safe log send between components.
- Update the log window to use this new handler.
- Remove old custom handler
  We have implemented a new handler that uses logbook, so this one is no
  longer needed.
- Adapt log silencer to new handler
- Use log file always as default

- Related: #6733
---
 src/leap/bitmask/logs/safezmqhandler.py | 118 ++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 src/leap/bitmask/logs/safezmqhandler.py

(limited to 'src/leap/bitmask/logs/safezmqhandler.py')

diff --git a/src/leap/bitmask/logs/safezmqhandler.py b/src/leap/bitmask/logs/safezmqhandler.py
new file mode 100644
index 00000000..7aac6a6a
--- /dev/null
+++ b/src/leap/bitmask/logs/safezmqhandler.py
@@ -0,0 +1,118 @@
+# -*- coding: utf-8 -*-
+# safezmqhandler.py
+# Copyright (C) 2013, 2014, 2015 LEAP
+#
+# This program 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.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+A thread-safe zmq handler for LogBook.
+"""
+import json
+import threading
+
+from logbook.queues import ZeroMQHandler
+from logbook import NOTSET
+
+import zmq
+
+
+class SafeZMQHandler(ZeroMQHandler):
+    """
+    A ZMQ log handler for LogBook that is thread-safe.
+
+    This log handler makes use of the existing zmq handler and if the user
+    tries to log something from a different thread than the one used to
+    create the handler a new socket is created for that thread.
+
+    Note: In ZMQ, Contexts are threadsafe objects, but Sockets are not.
+    """
+
+    def __init__(self, uri=None, level=NOTSET, filter=None, bubble=False,
+                 context=None, multi=False):
+
+        ZeroMQHandler.__init__(self, uri, level, filter, bubble, context,
+                               multi)
+
+        current_id = self._get_caller_id()
+        # we store the socket created on the parent
+        self._sockets = {current_id: self.socket}
+
+        # store the settings for new socket creation
+        self._multi = multi
+        self._uri = uri
+
+    def _get_caller_id(self):
+        """
+        Return an id for the caller that depends on the current thread.
+        Thanks to this we can detect if we are running in a thread different
+        than the one who created the socket and create a new one for it.
+
+        :rtype: int
+        """
+        # NOTE it makes no sense to use multiprocessing id since the sockets
+        # list can't/shouldn't be shared between processes. We only use
+        # thread id. The user needs to make sure that the handler is created
+        # inside each process.
+        return threading.current_thread().ident
+
+    def _get_new_socket(self):
+        """
+        Return a new socket using the `uri` and `multi` parameters given in the
+        constructor.
+
+        :rtype: zmq.Socket
+        """
+        socket = None
+
+        if self._multi:
+            socket = self.context.socket(zmq.PUSH)
+            if self._uri is not None:
+                socket.connect(self._uri)
+        else:
+            socket = self.context.socket(zmq.PUB)
+            if self._uri is not None:
+                socket.bind(self._uri)
+
+        return socket
+
+    def emit(self, record):
+        """
+        Emit the given `record` through the socket.
+
+        :param record: the record to emit
+        :type record: Logbook.LogRecord
+        """
+        current_id = self._get_caller_id()
+        socket = None
+
+        if current_id in self._sockets:
+            socket = self._sockets[current_id]
+        else:
+            # TODO: create new socket
+            socket = self._get_new_socket()
+            self._sockets[current_id] = socket
+
+        socket.send(json.dumps(self.export_record(record)).encode("utf-8"))
+
+    def close(self, linger=-1):
+        """
+        Close all the sockets and linger `linger` time.
+
+        This reimplements the ZeroMQHandler.close method that is used by
+        context methods.
+
+        :param linger: time to linger, -1 to not to.
+        :type linger: int
+        """
+        for socket in self._sockets.values():
+            socket.close(linger)
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