Add events module with basic API.

2 files changed, 104 insertions, 1 deletions

diff --git a/src/leap/common/__init__.py b/src/leap/common/__init__.py
index 3459ffb..5702ca1 100644
--- a/src/leap/common/__init__.py
+++ b/src/leap/common/__init__.py
@@ -3,6 +3,7 @@ import logging
 from leap.common import certs
 from leap.common import check
 from leap.common import files
+from leap.common import events
 
 logger = logging.getLogger(__name__)
 
@@ -13,4 +14,6 @@ except ImportError:
     logger.debug('PyGeoIP not found. Disabled Geo support.')
     HAS_GEOIP = False
 
-__all__ = ["certs", "check", "files"]
+__all__ = ["certs", "check", "files", "events"]
+
+__version__ = "0.2.0-dev"
diff --git a/src/leap/common/events/__init__.py b/src/leap/common/events/__init__.py
new file mode 100644
index 0000000..b8441bd
--- /dev/null
+++ b/src/leap/common/events/__init__.py
@@ -0,0 +1,100 @@
+# -*- coding: utf-8 -*-
+# __init__.py
+# Copyright (C) 2013 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/>.
+
+"""
+An events mechanism that allows for signaling of events between components.
+"""
+
+import logging
+import socket
+
+
+from leap.common.events import (
+    events_pb2,
+    server,
+    component,
+    daemon,
+)
+
+
+logger = logging.getLogger(__name__)
+
+
+def register(signal, callback, uid=None, replace=False, reqcbk=None,
+             timeout=1000):
+    """
+    Register a callback to be called when the given signal is received.
+
+    Will timeout after timeout ms if response has not been received. The
+    timeout arg is only used for asynch requests. If a reqcbk callback has
+    been supplied the timeout arg is not used. The response value will be
+    returned for a synch request but nothing will be returned for an asynch
+    request.
+
+    @param signal: the signal that causes the callback to be launched
+    @type signal: int (see the `events.proto` file)
+    @param callback: the callback to be called when the signal is received
+    @type callback: function
+    @param uid: a unique id for the callback
+    @type uid: int
+    @param replace: should an existent callback with same uid be replaced?
+    @type replace: bool
+    @param reqcbk: a callback to be called when a response from server is
+        received
+    @type reqcbk: function
+        callback(leap.common.events.events_pb2.EventResponse)
+    @param timeout: the timeout for synch calls
+    @type timeout: int
+
+    @return: the response from server for synch calls or nothing for asynch
+        calls
+    @rtype: leap.common.events.events_pb2.EventsResponse or None
+    """
+    return component.register(signal, callback, uid, replace, reqcbk, timeout)
+
+
+def signal(signal, content="", mac_method="", mac="", reqcbk=None,
+           timeout=1000):
+    """
+    Send `signal` event to events server.
+
+    Will timeout after timeout ms if response has not been received. The
+    timeout arg is only used for asynch requests.  If a reqcbk callback has
+    been supplied the timeout arg is not used. The response value will be
+    returned for a synch request but nothing will be returned for an asynch
+    request.
+
+    @param signal: the signal that causes the callback to be launched
+    @type signal: int (see the `events.proto` file)
+    @param content: the contents of the event signal
+    @type content: str
+    @param mac_method: the method used to auth mac
+    @type mac_method: str
+    @param mac: the content of the auth mac
+    @type mac: str
+    @param reqcbk: a callback to be called when a response from server is
+        received
+    @type reqcbk: function
+        callback(leap.common.events.events_pb2.EventResponse)
+    @param timeout: the timeout for synch calls
+    @type timeout: int
+
+    @return: the response from server for synch calls or nothing for asynch
+        calls
+    @rtype: leap.common.events.events_pb2.EventsResponse or None
+    """
+    return component.signal(signal)