Merge tag '0.3.0' into debian

Tag leap.common version 0.3.0

7 files changed, 731 insertions, 292 deletions

diff --git a/src/leap/common/events/README.rst b/src/leap/common/events/README.rst
index 813be8b..2e7f254 100644
--- a/src/leap/common/events/README.rst
+++ b/src/leap/common/events/README.rst
@@ -1,19 +1,19 @@
 Events mechanism
 ================
 
-The events mechanism allows for "components" to send signal events to each
-other by means of a centralized server. Components can register with the
+The events mechanism allows for clients to send signal events to each
+other by means of a centralized server. Clients can register with the
 server to receive signals of certain types, and they can also send signals to
-the server that will then redistribute these signals to registered components.
+the server that will then redistribute these signals to registered clients.
 
 
 Listening daemons
 -----------------
 
-Both components and the server listen for incoming messages by using a
+Both clients and the server listen for incoming messages by using a
 listening daemon that runs in its own thread. The server daemon has to be
-started explicitly, while components daemon will be started whenever a
-component registers with the server to receive messages.
+started explicitly, while clients daemon will be started whenever a
+client registers with the server to receive messages.
 
 
 How to use it
diff --git a/src/leap/common/events/__init__.py b/src/leap/common/events/__init__.py
index 9fc93ee..6eaf3d4 100644
--- a/src/leap/common/events/__init__.py
+++ b/src/leap/common/events/__init__.py
@@ -16,7 +16,58 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 """
-An events mechanism that allows for signaling of events between components.
+This is an events mechanism that uses a server to allow for signaling of
+events between clients.
+
+Application components should use the interface available in this file to
+register callbacks to be executed upon receiving specific signals, and to send
+signals to other components.
+
+To register a callback to be executed when a specific event is signaled, use
+leap.common.events.register():
+
+>>> from leap.common.events import register
+>>> from leap.common.events.proto import CLIENT_UID
+>>> register(CLIENT_UID, lambda req: do_something(req))
+
+To signal an event, use leap.common.events.signal():
+
+>>> from leap.common.events import signal
+>>> from leap.common.events.proto import CLIENT_UID
+>>> signal(CLIENT_UID)
+
+
+NOTE ABOUT SYNC/ASYNC REQUESTS:
+
+Clients always communicate with the server, and never between themselves.
+When a client registers a callback for an event, the callback is saved locally
+in the client and the server stores the client socket port in a list
+associated with that event. When a client signals an event, the server
+forwards the signal to all registered client ports, and then each client
+executes its callbacks associated with that event locally.
+
+Each RPC call from a client to the server is followed by a response from the
+server to the client. Calls to register() and signal() (and all other RPC
+calls) can be synchronous or asynchronous meaning if they will or not wait for
+the server's response before returning.
+
+This mechanism was built on top of protobuf.socketrpc, and because of this RPC
+calls are made synchronous or asynchronous in the following way:
+
+  * If RPC calls receive a parameter called `reqcbk`, then the call is made
+    asynchronous. That means that:
+
+        - an eventual `timeout` parameter is not used,
+        - the call returns immediatelly with value None, and
+        - the `reqcbk` callback is executed asynchronously upon the arrival of
+          a response from the server.
+
+  * Otherwise, if the `reqcbk` parameter is None, then the call is made in a
+    synchronous manner:
+
+        - if a response from server arrives within `timeout` milliseconds, the
+          RPC call returns it;
+        - otherwise, the call returns None.
 """
 
 import logging
@@ -24,9 +75,9 @@ import socket
 
 
 from leap.common.events import (
-    events_pb2,
+    events_pb2 as proto,
     server,
-    component,
+    client,
     daemon,
 )
 
@@ -54,17 +105,40 @@ def register(signal, callback, uid=None, replace=False, reqcbk=None,
     :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)
+                   received
+    :type reqcbk: function(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 client.register(signal, callback, uid, replace, reqcbk, timeout)
+
+
+def unregister(signal, uid=None, reqcbk=None, timeout=1000):
+    """
+    Unregister a callback.
+
+    If C{uid} is specified, unregisters only the callback identified by that
+    unique id. Otherwise, unregisters all callbacks registered for C{signal}.
+
+    :param signal: the signal that causes the callback to be launched
+    :type signal: int (see the `events.proto` file)
+    :param uid: a unique id for the callback
+    :type uid: int
+    :param reqcbk: a callback to be called when a response from server is
+                   received
+    :type reqcbk: function(proto.UnregisterRequest, proto.EventResponse)
     :param timeout: the timeout for synch calls
     :type timeout: int
 
     :return: the response from server for synch calls or nothing for asynch
-        calls
+             calls.
     :rtype: leap.common.events.events_pb2.EventsResponse or None
     """
-    return component.register(signal, callback, uid, replace, reqcbk, timeout)
+    return client.unregister(signal, uid, reqcbk, timeout)
 
 
 def signal(signal, content="", mac_method="", mac="", reqcbk=None,
@@ -87,14 +161,42 @@ def signal(signal, content="", mac_method="", mac="", reqcbk=None,
     :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)
+                   received
+    :type reqcbk: function(proto.SignalRequest, proto.EventResponse)
     :param timeout: the timeout for synch calls
     :type timeout: int
 
     :return: the response from server for synch calls or nothing for asynch
-        calls
+             calls.
     :rtype: leap.common.events.events_pb2.EventsResponse or None
     """
-    return component.signal(signal, content, mac_method, mac, reqcbk, timeout)
+    return client.signal(signal, content, mac_method, mac, reqcbk, timeout)
+
+def ping_client(port, reqcbk=None, timeout=1000):
+    """
+    Ping a client running in C{port}.
+
+    :param port: the port in which the client should be listening
+    :type port: int
+    :param reqcbk: a callback to be called when a response from client is
+                   received
+    :type reqcbk: function(proto.PingRequest, proto.EventResponse)
+    :param timeout: the timeout for synch calls
+    :type timeout: int
+    """
+    return client.ping(port, reqcbk=reqcbk, timeout=timeout)
+
+
+def ping_server(port=server.SERVER_PORT, reqcbk=None, timeout=1000):
+    """
+    Ping the server.
+
+    :param port: the port in which server should be listening
+    :type port: int
+    :param reqcbk: a callback to be called when a response from server is
+                   received
+    :type reqcbk: function(proto.PingRequest, proto.EventResponse)
+    :param timeout: the timeout for synch calls
+    :type timeout: int
+    """
+    return server.ping(port, reqcbk=reqcbk, timeout=timeout)
diff --git a/src/leap/common/events/component.py b/src/leap/common/events/client.py
index 9932190..4ae9bff 100644
--- a/src/leap/common/events/component.py
+++ b/src/leap/common/events/client.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# component.py
+# client.py
 # Copyright (C) 2013 LEAP
 #
 # This program is free software: you can redistribute it and/or modify
@@ -16,15 +16,15 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 """
-The component end point of the events mechanism.
+The client end point of the events mechanism.
 
-Components are the communicating parties of the events mechanism. They
+Clients are the communicating parties of the events mechanism. They
 communicate by sending messages to a server, which in turn redistributes
-messages to other components.
+messages to other clients.
 
-When a component registers a callback for a given signal, it also tells the
+When a client registers a callback for a given signal, it also tells the
 server that it wants to be notified whenever signals of that type are sent by
-some other component.
+some other client.
 """
 
 
@@ -56,25 +56,26 @@ class CallbackAlreadyRegistered(Exception):
     """
     Raised when trying to register an already registered callback.
     """
+    pass
 
 
-def ensure_component_daemon():
+def ensure_client_daemon():
     """
-    Ensure the component daemon is running and listening for incoming
+    Ensure the client daemon is running and listening for incoming
     messages.
 
     :return: the daemon instance
-    :rtype: EventsComponentDaemon
+    :rtype: EventsClientDaemon
     """
     import time
-    daemon = EventsComponentDaemon.ensure(0)
-    logger.debug('ensure component daemon')
+    daemon = EventsClientDaemon.ensure(0)
+    logger.debug('ensure client daemon')
 
     # Because we use a random port we want to wait until a port is assigned to
-    # local component daemon.
+    # local client daemon.
 
-    while not (EventsComponentDaemon.get_instance() and
-               EventsComponentDaemon.get_instance().get_port()):
+    while not (EventsClientDaemon.get_instance() and
+               EventsClientDaemon.get_instance().get_port()):
         time.sleep(0.1)
     return daemon
 
@@ -94,16 +95,14 @@ def register(signal, callback, uid=None, replace=False, reqcbk=None,
     :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
-        callback(leap.common.events.events_pb2.SignalRequest)
+    :type callback: function(leap.common.events.events_pb2.SignalRequest)
     :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)
+                   received
+    :type reqcbk: function(proto.RegisterRequest, proto.EventResponse)
     :param timeout: the timeout for synch calls
     :type timeout: int
 
@@ -111,10 +110,10 @@ def register(signal, callback, uid=None, replace=False, reqcbk=None,
     callback identified by the given uid and replace is False.
 
     :return: the response from server for synch calls or nothing for asynch
-        calls
+             calls.
     :rtype: leap.common.events.events_pb2.EventsResponse or None
     """
-    ensure_component_daemon()  # so we can receive registered signals
+    ensure_client_daemon()  # so we can receive registered signals
     # register callback locally
     if signal not in registered_callbacks:
         registered_callbacks[signal] = []
@@ -129,7 +128,7 @@ def register(signal, callback, uid=None, replace=False, reqcbk=None,
     # register callback on server
     request = proto.RegisterRequest()
     request.event = signal
-    request.port = EventsComponentDaemon.get_instance().get_port()
+    request.port = EventsClientDaemon.get_instance().get_port()
     request.mac_method = mac_auth.MacMethod.MAC_NONE
     request.mac = ""
     service = RpcService(proto.EventsServerService_Stub,
@@ -140,6 +139,56 @@ def register(signal, callback, uid=None, replace=False, reqcbk=None,
         str(request)[:40])
     return service.register(request, callback=reqcbk, timeout=timeout)
 
+def unregister(signal, uid=None, reqcbk=None, timeout=1000):
+    """
+    Unregister a callback.
+
+    If C{uid} is specified, unregisters only the callback identified by that
+    unique id. Otherwise, unregisters all callbacks
+
+    :param signal: the signal that causes the callback to be launched
+    :type signal: int (see the `events.proto` file)
+    :param uid: a unique id for the callback
+    :type uid: int
+    :param reqcbk: a callback to be called when a response from server is
+                   received
+    :type reqcbk: function(proto.UnregisterRequest, proto.EventResponse)
+    :param timeout: the timeout for synch calls
+    :type timeout: int
+
+    :return: the response from server for synch calls or nothing for asynch
+             calls or None if no callback is registered for that signal or
+             uid.
+    :rtype: leap.common.events.events_pb2.EventsResponse or None
+    """
+    if signal not in registered_callbacks or not registered_callbacks[signal]:
+        logger.warning("No callback registered for signal %d." % signal)
+        return None
+    # unregister callback locally
+    cbklist = registered_callbacks[signal]
+    if uid is not None:
+        if filter(lambda (cbkuid, _): cbkuid == uid, cbklist) == []:
+            logger.warning("No callback registered for uid %d." % st)
+            return None
+        registered_callbacks[signal] = filter(lambda(x, y): x != uid, cbklist)
+    else:
+        # exclude all callbacks for given signal
+        registered_callbacks[signal] = []
+    # unregister port in server if there are no more callbacks for this signal
+    if not registered_callbacks[signal]:
+        request = proto.UnregisterRequest()
+        request.event = signal
+        request.port = EventsClientDaemon.get_instance().get_port()
+        request.mac_method = mac_auth.MacMethod.MAC_NONE
+        request.mac = ""
+        service = RpcService(proto.EventsServerService_Stub,
+                             server.SERVER_PORT, 'localhost')
+        logger.info(
+            "Sending unregistration request to server on port %s: %s",
+            server.SERVER_PORT,
+            str(request)[:40])
+        return service.unregister(request, callback=reqcbk, timeout=timeout)
+
 
 def signal(signal, content="", mac_method="", mac="", reqcbk=None,
            timeout=1000):
@@ -161,14 +210,13 @@ def signal(signal, content="", mac_method="", mac="", reqcbk=None,
     :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)
+                   received
+    :type reqcbk: function(proto.SignalRequest, proto.EventResponse)
     :param timeout: the timeout for synch calls
     :type timeout: int
 
     :return: the response from server for synch calls or nothing for asynch
-        calls
+             calls.
     :rtype: leap.common.events.events_pb2.EventsResponse or None
     """
     request = proto.SignalRequest()
@@ -182,13 +230,38 @@ def signal(signal, content="", mac_method="", mac="", reqcbk=None,
     return service.signal(request, callback=reqcbk, timeout=timeout)
 
 
-class EventsComponentService(proto.EventsComponentService):
+def ping(port, reqcbk=None, timeout=1000):
     """
-    Service for receiving signal events in components.
+    Ping a client running in C{port}.
+
+    :param port: the port in which the client should be listening
+    :type port: int
+    :param reqcbk: a callback to be called when a response from client is
+                   received
+    :type reqcbk: function(proto.PingRequest, proto.EventResponse)
+    :param timeout: the timeout for synch calls
+    :type timeout: int
+
+    :return: the response from client for synch calls or nothing for asynch
+             calls.
+    :rtype: leap.common.events.events_pb2.EventsResponse or None
+    """
+    request = proto.PingRequest()
+    service = RpcService(
+        proto.EventsClientService_Stub,
+        port,
+        'localhost')
+    logger.info("Pinging a client in port %d..." % port)
+    return service.ping(request, callback=reqcbk, timeout=timeout)
+
+
+class EventsClientService(proto.EventsClientService):
+    """
+    Service for receiving signal events in clients.
     """
 
     def __init__(self):
-        proto.EventsComponentService.__init__(self)
+        proto.EventsClientService.__init__(self)
 
     def signal(self, controller, request, done):
         """
@@ -199,7 +272,7 @@ class EventsComponentService(proto.EventsComponentService):
 
         :param controller: used to mediate a single method call
         :type controller: protobuf.socketrpc.controller.SocketRpcController
-        :param request: the request received from the component
+        :param request: the request received from the client
         :type request: leap.common.events.events_pb2.SignalRequest
         :param done: callback to be called when done
         :type done: protobuf.socketrpc.server.Callback
@@ -219,8 +292,24 @@ class EventsComponentService(proto.EventsComponentService):
         response.status = proto.EventResponse.OK
         done.run(response)
 
+    def ping(self, controller, request, done):
+        """
+        Reply to a ping request.
+
+        :param controller: used to mediate a single method call
+        :type controller: protobuf.socketrpc.controller.SocketRpcController
+        :param request: the request received from the client
+        :type request: leap.common.events.events_pb2.RegisterRequest
+        :param done: callback to be called when done
+        :type done: protobuf.socketrpc.server.Callback
+        """
+        logger.info("Received ping request, sending response.")
+        response = proto.EventResponse()
+        response.status = proto.EventResponse.OK
+        done.run(response)
+
 
-class EventsComponentDaemon(daemon.EventsSingletonDaemon):
+class EventsClientDaemon(daemon.EventsSingletonDaemon):
     """
     A daemon that listens for incoming events from server.
     """
@@ -234,6 +323,6 @@ class EventsComponentDaemon(daemon.EventsSingletonDaemon):
         :type port: int
 
         :return: a daemon instance
-        :rtype: EventsComponentDaemon
+        :rtype: EventsClientDaemon
         """
-        return cls.ensure_service(port, EventsComponentService())
+        return cls.ensure_service(port, EventsClientService())
diff --git a/src/leap/common/events/daemon.py b/src/leap/common/events/daemon.py
index c253948..c4a4189 100644
--- a/src/leap/common/events/daemon.py
+++ b/src/leap/common/events/daemon.py
@@ -43,7 +43,7 @@ class ServiceAlreadyRunningException(Exception):
 
 class EventsRpcServer(SocketRpcServer):
     """
-    RPC server used in server and component interfaces to receive messages.
+    RPC server used in server and client interfaces to receive messages.
     """
 
     def __init__(self, port, host='localhost'):
diff --git a/src/leap/common/events/events.proto b/src/leap/common/events/events.proto
index 447b038..b844f42 100644
--- a/src/leap/common/events/events.proto
+++ b/src/leap/common/events/events.proto
@@ -17,6 +17,9 @@
 package leap.common.events;
 option py_generic_services = true;
 
+
+// These are the events that can be signaled using the events mechanism.
+
 enum Event {
   CLIENT_SESSION_ID = 1;
   CLIENT_UID = 2;
@@ -33,6 +36,10 @@ enum Event {
   RAISE_WINDOW = 13;
 }
 
+
+// A SignalRequest is the type of the message sent from one component to request
+// that a signal be sent to every registered component.
+
 message SignalRequest {
   required Event event = 1;
   required string content = 2;
@@ -42,6 +49,10 @@ message SignalRequest {
   optional bool error_occurred = 6;
 }
 
+
+// A RegisterRequest message tells the server that a component wants to
+// be signaled whenever a specific event occurs.
+
 message RegisterRequest {
   required Event event = 1;
   required int32 port = 2;
@@ -49,6 +60,28 @@ message RegisterRequest {
   required bytes mac = 4;
 }
 
+
+// An UnregisterRequest message tells the server that a component does not
+// want to be signaled when a specific event occurs.
+
+message UnregisterRequest {
+  required Event event = 1;
+  required int32 port = 2;
+  required string mac_method = 3;
+  required bytes mac = 4;
+}
+
+
+// A PingRequest message is used to find out if a server or component is
+// alive.
+
+message PingRequest {
+}
+
+
+// The EventResponse is the message sent back by server and components after
+// they receive other kinds of requests.
+
 message EventResponse {
 
   enum Status {
@@ -61,11 +94,20 @@ message EventResponse {
   optional string result = 2;
 }
 
+
+// The EventsServerService is the service provided by the server.
+
 service EventsServerService {
+  rpc ping(PingRequest) returns (EventResponse);
   rpc register(RegisterRequest) returns (EventResponse);
+  rpc unregister(UnregisterRequest) returns (EventResponse);
   rpc signal(SignalRequest) returns (EventResponse);
 }
 
-service EventsComponentService {
+
+// EventsComponentService is the service provided by components (clients).
+
+service EventsClientService {
+  rpc ping(PingRequest) returns (EventResponse);
   rpc signal(SignalRequest) returns (EventResponse);
 }
diff --git a/src/leap/common/events/events_pb2.py b/src/leap/common/events/events_pb2.py
index a4f1df4..274514c 100644
--- a/src/leap/common/events/events_pb2.py
+++ b/src/leap/common/events/events_pb2.py
@@ -1,85 +1,87 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: events.proto
 
-from google.protobuf import descriptor
-from google.protobuf import message
-from google.protobuf import reflection
-from google.protobuf import service
+from google.protobuf.internal import enum_type_wrapper
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
+from google.protobuf import service as _service
 from google.protobuf import service_reflection
 from google.protobuf import descriptor_pb2
 # @@protoc_insertion_point(imports)
 
 
-DESCRIPTOR = descriptor.FileDescriptor(
+DESCRIPTOR = _descriptor.FileDescriptor(
     name='events.proto',
     package='leap.common.events',
-    serialized_pb='\n\x0c\x65vents.proto\x12\x12leap.common.events\"\x97\x01\n\rSignalRequest\x12(\n\x05\x65vent\x18\x01 \x02(\x0e\x32\x19.leap.common.events.Event\x12\x0f\n\x07\x63ontent\x18\x02 \x02(\t\x12\x12\n\nmac_method\x18\x03 \x02(\t\x12\x0b\n\x03mac\x18\x04 \x02(\x0c\x12\x12\n\nenc_method\x18\x05 \x01(\t\x12\x16\n\x0e\x65rror_occurred\x18\x06 \x01(\x08\"j\n\x0fRegisterRequest\x12(\n\x05\x65vent\x18\x01 \x02(\x0e\x32\x19.leap.common.events.Event\x12\x0c\n\x04port\x18\x02 \x02(\x05\x12\x12\n\nmac_method\x18\x03 \x02(\t\x12\x0b\n\x03mac\x18\x04 \x02(\x0c\"\x82\x01\n\rEventResponse\x12\x38\n\x06status\x18\x01 \x02(\x0e\x32(.leap.common.events.EventResponse.Status\x12\x0e\n\x06result\x18\x02 \x01(\t\"\'\n\x06Status\x12\x06\n\x02OK\x10\x01\x12\n\n\x06UNAUTH\x10\x02\x12\t\n\x05\x45RROR\x10\x03*\xe7\x02\n\x05\x45vent\x12\x15\n\x11\x43LIENT_SESSION_ID\x10\x01\x12\x0e\n\nCLIENT_UID\x10\x02\x12\x19\n\x15SOLEDAD_CREATING_KEYS\x10\x03\x12\x1e\n\x1aSOLEDAD_DONE_CREATING_KEYS\x10\x04\x12\x1a\n\x16SOLEDAD_UPLOADING_KEYS\x10\x05\x12\x1f\n\x1bSOLEDAD_DONE_UPLOADING_KEYS\x10\x06\x12\x1c\n\x18SOLEDAD_DOWNLOADING_KEYS\x10\x07\x12!\n\x1dSOLEDAD_DONE_DOWNLOADING_KEYS\x10\x08\x12\x1c\n\x18SOLEDAD_NEW_DATA_TO_SYNC\x10\t\x12\x1a\n\x16SOLEDAD_DONE_DATA_SYNC\x10\n\x12\x17\n\x13UPDATER_NEW_UPDATES\x10\x0b\x12\x19\n\x15UPDATER_DONE_UPDATING\x10\x0c\x12\x10\n\x0cRAISE_WINDOW\x10\r2\xb9\x01\n\x13\x45ventsServerService\x12R\n\x08register\x12#.leap.common.events.RegisterRequest\x1a!.leap.common.events.EventResponse\x12N\n\x06signal\x12!.leap.common.events.SignalRequest\x1a!.leap.common.events.EventResponse2h\n\x16\x45ventsComponentService\x12N\n\x06signal\x12!.leap.common.events.SignalRequest\x1a!.leap.common.events.EventResponseB\x03\x90\x01\x01')
+    serialized_pb='\n\x0c\x65vents.proto\x12\x12leap.common.events\"\x97\x01\n\rSignalRequest\x12(\n\x05\x65vent\x18\x01 \x02(\x0e\x32\x19.leap.common.events.Event\x12\x0f\n\x07\x63ontent\x18\x02 \x02(\t\x12\x12\n\nmac_method\x18\x03 \x02(\t\x12\x0b\n\x03mac\x18\x04 \x02(\x0c\x12\x12\n\nenc_method\x18\x05 \x01(\t\x12\x16\n\x0e\x65rror_occurred\x18\x06 \x01(\x08\"j\n\x0fRegisterRequest\x12(\n\x05\x65vent\x18\x01 \x02(\x0e\x32\x19.leap.common.events.Event\x12\x0c\n\x04port\x18\x02 \x02(\x05\x12\x12\n\nmac_method\x18\x03 \x02(\t\x12\x0b\n\x03mac\x18\x04 \x02(\x0c\"l\n\x11UnregisterRequest\x12(\n\x05\x65vent\x18\x01 \x02(\x0e\x32\x19.leap.common.events.Event\x12\x0c\n\x04port\x18\x02 \x02(\x05\x12\x12\n\nmac_method\x18\x03 \x02(\t\x12\x0b\n\x03mac\x18\x04 \x02(\x0c\"\r\n\x0bPingRequest\"\x82\x01\n\rEventResponse\x12\x38\n\x06status\x18\x01 \x02(\x0e\x32(.leap.common.events.EventResponse.Status\x12\x0e\n\x06result\x18\x02 \x01(\t\"\'\n\x06Status\x12\x06\n\x02OK\x10\x01\x12\n\n\x06UNAUTH\x10\x02\x12\t\n\x05\x45RROR\x10\x03*\xe7\x02\n\x05\x45vent\x12\x15\n\x11\x43LIENT_SESSION_ID\x10\x01\x12\x0e\n\nCLIENT_UID\x10\x02\x12\x19\n\x15SOLEDAD_CREATING_KEYS\x10\x03\x12\x1e\n\x1aSOLEDAD_DONE_CREATING_KEYS\x10\x04\x12\x1a\n\x16SOLEDAD_UPLOADING_KEYS\x10\x05\x12\x1f\n\x1bSOLEDAD_DONE_UPLOADING_KEYS\x10\x06\x12\x1c\n\x18SOLEDAD_DOWNLOADING_KEYS\x10\x07\x12!\n\x1dSOLEDAD_DONE_DOWNLOADING_KEYS\x10\x08\x12\x1c\n\x18SOLEDAD_NEW_DATA_TO_SYNC\x10\t\x12\x1a\n\x16SOLEDAD_DONE_DATA_SYNC\x10\n\x12\x17\n\x13UPDATER_NEW_UPDATES\x10\x0b\x12\x19\n\x15UPDATER_DONE_UPDATING\x10\x0c\x12\x10\n\x0cRAISE_WINDOW\x10\r2\xdd\x02\n\x13\x45ventsServerService\x12J\n\x04ping\x12\x1f.leap.common.events.PingRequest\x1a!.leap.common.events.EventResponse\x12R\n\x08register\x12#.leap.common.events.RegisterRequest\x1a!.leap.common.events.EventResponse\x12V\n\nunregister\x12%.leap.common.events.UnregisterRequest\x1a!.leap.common.events.EventResponse\x12N\n\x06signal\x12!.leap.common.events.SignalRequest\x1a!.leap.common.events.EventResponse2\xb1\x01\n\x13\x45ventsClientService\x12J\n\x04ping\x12\x1f.leap.common.events.PingRequest\x1a!.leap.common.events.EventResponse\x12N\n\x06signal\x12!.leap.common.events.SignalRequest\x1a!.leap.common.events.EventResponseB\x03\x90\x01\x01')
 
-_EVENT = descriptor.EnumDescriptor(
+_EVENT = _descriptor.EnumDescriptor(
     name='Event',
     full_name='leap.common.events.Event',
     filename=None,
     file=DESCRIPTOR,
     values=[
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='CLIENT_SESSION_ID', index=0, number=1,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='CLIENT_UID', index=1, number=2,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='SOLEDAD_CREATING_KEYS', index=2, number=3,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='SOLEDAD_DONE_CREATING_KEYS', index=3, number=4,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='SOLEDAD_UPLOADING_KEYS', index=4, number=5,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='SOLEDAD_DONE_UPLOADING_KEYS', index=5, number=6,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='SOLEDAD_DOWNLOADING_KEYS', index=6, number=7,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='SOLEDAD_DONE_DOWNLOADING_KEYS', index=7, number=8,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='SOLEDAD_NEW_DATA_TO_SYNC', index=8, number=9,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='SOLEDAD_DONE_DATA_SYNC', index=9, number=10,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='UPDATER_NEW_UPDATES', index=10, number=11,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='UPDATER_DONE_UPDATING', index=11, number=12,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='RAISE_WINDOW', index=12, number=13,
             options=None,
             type=None),
     ],
     containing_type=None,
     options=None,
-    serialized_start=432,
-    serialized_end=791,
+    serialized_start=557,
+    serialized_end=916,
 )
 
-
+Event = enum_type_wrapper.EnumTypeWrapper(_EVENT)
 CLIENT_SESSION_ID = 1
 CLIENT_UID = 2
 SOLEDAD_CREATING_KEYS = 3
@@ -95,240 +97,349 @@ UPDATER_DONE_UPDATING = 12
 RAISE_WINDOW = 13
 
 
-_EVENTRESPONSE_STATUS = descriptor.EnumDescriptor(
+_EVENTRESPONSE_STATUS = _descriptor.EnumDescriptor(
     name='Status',
     full_name='leap.common.events.EventResponse.Status',
     filename=None,
     file=DESCRIPTOR,
     values=[
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='OK', index=0, number=1,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='UNAUTH', index=1, number=2,
             options=None,
             type=None),
-        descriptor.EnumValueDescriptor(
+        _descriptor.EnumValueDescriptor(
             name='ERROR', index=2, number=3,
             options=None,
             type=None),
     ],
     containing_type=None,
     options=None,
-    serialized_start=390,
-    serialized_end=429,
+    serialized_start=515,
+    serialized_end=554,
 )
 
 
-_SIGNALREQUEST = descriptor.Descriptor(
+_SIGNALREQUEST = _descriptor.Descriptor(
     name='SignalRequest',
     full_name='leap.common.events.SignalRequest',
     filename=None,
     file=DESCRIPTOR,
     containing_type=None,
     fields=[
-        descriptor.FieldDescriptor(
+        _descriptor.FieldDescriptor(
             name='event', full_name='leap.common.events.SignalRequest.event', index=0,
             number=1, type=14, cpp_type=8, label=2,
             has_default_value=False, default_value=1,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='content', full_name='leap.common.events.SignalRequest.content', index=1,
-      number=2, type=9, cpp_type=9, label=2,
-      has_default_value=False, default_value=unicode("", "utf-8"),
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='mac_method', full_name='leap.common.events.SignalRequest.mac_method', index=2,
-      number=3, type=9, cpp_type=9, label=2,
-      has_default_value=False, default_value=unicode("", "utf-8"),
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='mac', full_name='leap.common.events.SignalRequest.mac', index=3,
-      number=4, type=12, cpp_type=9, label=2,
-      has_default_value=False, default_value="",
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='enc_method', full_name='leap.common.events.SignalRequest.enc_method', index=4,
-      number=5, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=unicode("", "utf-8"),
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='error_occurred', full_name='leap.common.events.SignalRequest.error_occurred', index=5,
-      number=6, type=8, cpp_type=7, label=1,
-      has_default_value=False, default_value=False,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-  ],
-  extensions=[
-  ],
-  nested_types=[],
-  enum_types=[
-  ],
-  options=None,
-  is_extendable=False,
-  extension_ranges=[],
-  serialized_start=37,
-  serialized_end=188,
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='content', full_name='leap.common.events.SignalRequest.content', index=1,
+            number=2, type=9, cpp_type=9, label=2,
+            has_default_value=False, default_value=unicode("", "utf-8"),
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='mac_method', full_name='leap.common.events.SignalRequest.mac_method', index=2,
+            number=3, type=9, cpp_type=9, label=2,
+            has_default_value=False, default_value=unicode("", "utf-8"),
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='mac', full_name='leap.common.events.SignalRequest.mac', index=3,
+            number=4, type=12, cpp_type=9, label=2,
+            has_default_value=False, default_value="",
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='enc_method', full_name='leap.common.events.SignalRequest.enc_method', index=4,
+            number=5, type=9, cpp_type=9, label=1,
+            has_default_value=False, default_value=unicode("", "utf-8"),
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='error_occurred', full_name='leap.common.events.SignalRequest.error_occurred', index=5,
+            number=6, type=8, cpp_type=7, label=1,
+            has_default_value=False, default_value=False,
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+    ],
+    extensions=[
+    ],
+    nested_types=[],
+    enum_types=[
+    ],
+    options=None,
+    is_extendable=False,
+    extension_ranges=[],
+    serialized_start=37,
+    serialized_end=188,
+)
+
+
+_REGISTERREQUEST = _descriptor.Descriptor(
+    name='RegisterRequest',
+    full_name='leap.common.events.RegisterRequest',
+    filename=None,
+    file=DESCRIPTOR,
+    containing_type=None,
+    fields=[
+        _descriptor.FieldDescriptor(
+            name='event', full_name='leap.common.events.RegisterRequest.event', index=0,
+            number=1, type=14, cpp_type=8, label=2,
+            has_default_value=False, default_value=1,
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='port', full_name='leap.common.events.RegisterRequest.port', index=1,
+            number=2, type=5, cpp_type=1, label=2,
+            has_default_value=False, default_value=0,
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='mac_method', full_name='leap.common.events.RegisterRequest.mac_method', index=2,
+            number=3, type=9, cpp_type=9, label=2,
+            has_default_value=False, default_value=unicode("", "utf-8"),
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='mac', full_name='leap.common.events.RegisterRequest.mac', index=3,
+            number=4, type=12, cpp_type=9, label=2,
+            has_default_value=False, default_value="",
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+    ],
+    extensions=[
+    ],
+    nested_types=[],
+    enum_types=[
+    ],
+    options=None,
+    is_extendable=False,
+    extension_ranges=[],
+    serialized_start=190,
+    serialized_end=296,
+)
+
+
+_UNREGISTERREQUEST = _descriptor.Descriptor(
+    name='UnregisterRequest',
+    full_name='leap.common.events.UnregisterRequest',
+    filename=None,
+    file=DESCRIPTOR,
+    containing_type=None,
+    fields=[
+        _descriptor.FieldDescriptor(
+            name='event', full_name='leap.common.events.UnregisterRequest.event', index=0,
+            number=1, type=14, cpp_type=8, label=2,
+            has_default_value=False, default_value=1,
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='port', full_name='leap.common.events.UnregisterRequest.port', index=1,
+            number=2, type=5, cpp_type=1, label=2,
+            has_default_value=False, default_value=0,
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='mac_method', full_name='leap.common.events.UnregisterRequest.mac_method', index=2,
+            number=3, type=9, cpp_type=9, label=2,
+            has_default_value=False, default_value=unicode("", "utf-8"),
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='mac', full_name='leap.common.events.UnregisterRequest.mac', index=3,
+            number=4, type=12, cpp_type=9, label=2,
+            has_default_value=False, default_value="",
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+    ],
+    extensions=[
+    ],
+    nested_types=[],
+    enum_types=[
+    ],
+    options=None,
+    is_extendable=False,
+    extension_ranges=[],
+    serialized_start=298,
+    serialized_end=406,
 )
 
 
-_REGISTERREQUEST = descriptor.Descriptor(
-  name='RegisterRequest',
-  full_name='leap.common.events.RegisterRequest',
-  filename=None,
-  file=DESCRIPTOR,
-  containing_type=None,
-  fields=[
-    descriptor.FieldDescriptor(
-      name='event', full_name='leap.common.events.RegisterRequest.event', index=0,
-      number=1, type=14, cpp_type=8, label=2,
-      has_default_value=False, default_value=1,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='port', full_name='leap.common.events.RegisterRequest.port', index=1,
-      number=2, type=5, cpp_type=1, label=2,
-      has_default_value=False, default_value=0,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='mac_method', full_name='leap.common.events.RegisterRequest.mac_method', index=2,
-      number=3, type=9, cpp_type=9, label=2,
-      has_default_value=False, default_value=unicode("", "utf-8"),
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='mac', full_name='leap.common.events.RegisterRequest.mac', index=3,
-      number=4, type=12, cpp_type=9, label=2,
-      has_default_value=False, default_value="",
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-  ],
-  extensions=[
-  ],
-  nested_types=[],
-  enum_types=[
-  ],
-  options=None,
-  is_extendable=False,
-  extension_ranges=[],
-  serialized_start=190,
-  serialized_end=296,
+_PINGREQUEST = _descriptor.Descriptor(
+    name='PingRequest',
+    full_name='leap.common.events.PingRequest',
+    filename=None,
+    file=DESCRIPTOR,
+    containing_type=None,
+    fields=[
+    ],
+    extensions=[
+    ],
+    nested_types=[],
+    enum_types=[
+    ],
+    options=None,
+    is_extendable=False,
+    extension_ranges=[],
+    serialized_start=408,
+    serialized_end=421,
 )
 
 
-_EVENTRESPONSE = descriptor.Descriptor(
-  name='EventResponse',
-  full_name='leap.common.events.EventResponse',
-  filename=None,
-  file=DESCRIPTOR,
-  containing_type=None,
-  fields=[
-    descriptor.FieldDescriptor(
-      name='status', full_name='leap.common.events.EventResponse.status', index=0,
-      number=1, type=14, cpp_type=8, label=2,
-      has_default_value=False, default_value=1,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    descriptor.FieldDescriptor(
-      name='result', full_name='leap.common.events.EventResponse.result', index=1,
-      number=2, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=unicode("", "utf-8"),
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-  ],
-  extensions=[
-  ],
-  nested_types=[],
-  enum_types=[
-    _EVENTRESPONSE_STATUS,
-  ],
-  options=None,
-  is_extendable=False,
-  extension_ranges=[],
-  serialized_start=299,
-  serialized_end=429,
+_EVENTRESPONSE = _descriptor.Descriptor(
+    name='EventResponse',
+    full_name='leap.common.events.EventResponse',
+    filename=None,
+    file=DESCRIPTOR,
+    containing_type=None,
+    fields=[
+        _descriptor.FieldDescriptor(
+            name='status', full_name='leap.common.events.EventResponse.status', index=0,
+            number=1, type=14, cpp_type=8, label=2,
+            has_default_value=False, default_value=1,
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+        _descriptor.FieldDescriptor(
+            name='result', full_name='leap.common.events.EventResponse.result', index=1,
+            number=2, type=9, cpp_type=9, label=1,
+            has_default_value=False, default_value=unicode("", "utf-8"),
+            message_type=None, enum_type=None, containing_type=None,
+            is_extension=False, extension_scope=None,
+            options=None),
+    ],
+    extensions=[
+    ],
+    nested_types=[],
+    enum_types=[
+        _EVENTRESPONSE_STATUS,
+    ],
+    options=None,
+    is_extendable=False,
+    extension_ranges=[],
+    serialized_start=424,
+    serialized_end=554,
 )
 
 _SIGNALREQUEST.fields_by_name['event'].enum_type = _EVENT
 _REGISTERREQUEST.fields_by_name['event'].enum_type = _EVENT
+_UNREGISTERREQUEST.fields_by_name['event'].enum_type = _EVENT
 _EVENTRESPONSE.fields_by_name['status'].enum_type = _EVENTRESPONSE_STATUS
-_EVENTRESPONSE_STATUS.containing_type = _EVENTRESPONSE;
+_EVENTRESPONSE_STATUS.containing_type = _EVENTRESPONSE
 DESCRIPTOR.message_types_by_name['SignalRequest'] = _SIGNALREQUEST
 DESCRIPTOR.message_types_by_name['RegisterRequest'] = _REGISTERREQUEST
+DESCRIPTOR.message_types_by_name['UnregisterRequest'] = _UNREGISTERREQUEST
+DESCRIPTOR.message_types_by_name['PingRequest'] = _PINGREQUEST
 DESCRIPTOR.message_types_by_name['EventResponse'] = _EVENTRESPONSE
 
 
-class SignalRequest(message.Message):
-    __metaclass__ = reflection.GeneratedProtocolMessageType
+class SignalRequest(_message.Message):
+    __metaclass__ = _reflection.GeneratedProtocolMessageType
     DESCRIPTOR = _SIGNALREQUEST
 
     # @@protoc_insertion_point(class_scope:leap.common.events.SignalRequest)
 
 
-class RegisterRequest(message.Message):
-    __metaclass__ = reflection.GeneratedProtocolMessageType
+class RegisterRequest(_message.Message):
+    __metaclass__ = _reflection.GeneratedProtocolMessageType
     DESCRIPTOR = _REGISTERREQUEST
 
     # @@protoc_insertion_point(class_scope:leap.common.events.RegisterRequest)
 
 
-class EventResponse(message.Message):
-    __metaclass__ = reflection.GeneratedProtocolMessageType
+class UnregisterRequest(_message.Message):
+    __metaclass__ = _reflection.GeneratedProtocolMessageType
+    DESCRIPTOR = _UNREGISTERREQUEST
+
+    # @@protoc_insertion_point(class_scope:leap.common.events.UnregisterRequest)
+
+
+class PingRequest(_message.Message):
+    __metaclass__ = _reflection.GeneratedProtocolMessageType
+    DESCRIPTOR = _PINGREQUEST
+
+    # @@protoc_insertion_point(class_scope:leap.common.events.PingRequest)
+
+
+class EventResponse(_message.Message):
+    __metaclass__ = _reflection.GeneratedProtocolMessageType
     DESCRIPTOR = _EVENTRESPONSE
 
     # @@protoc_insertion_point(class_scope:leap.common.events.EventResponse)
 
 
-_EVENTSSERVERSERVICE = descriptor.ServiceDescriptor(
-  name='EventsServerService',
-  full_name='leap.common.events.EventsServerService',
-  file=DESCRIPTOR,
-  index=0,
-  options=None,
-  serialized_start=794,
-  serialized_end=979,
-  methods=[
-  descriptor.MethodDescriptor(
-    name='register',
-    full_name='leap.common.events.EventsServerService.register',
+DESCRIPTOR.has_options = True
+DESCRIPTOR._options = _descriptor._ParseOptions(
+    descriptor_pb2.FileOptions(), '\220\001\001')
+
+_EVENTSSERVERSERVICE = _descriptor.ServiceDescriptor(
+    name='EventsServerService',
+    full_name='leap.common.events.EventsServerService',
+    file=DESCRIPTOR,
     index=0,
-    containing_service=None,
-    input_type=_REGISTERREQUEST,
-    output_type=_EVENTRESPONSE,
-    options=None,
-  ),
-  descriptor.MethodDescriptor(
-    name='signal',
-    full_name='leap.common.events.EventsServerService.signal',
-    index=1,
-    containing_service=None,
-    input_type=_SIGNALREQUEST,
-    output_type=_EVENTRESPONSE,
     options=None,
-  ),
-])
+    serialized_start=919,
+    serialized_end=1268,
+    methods=[
+        _descriptor.MethodDescriptor(
+            name='ping',
+            full_name='leap.common.events.EventsServerService.ping',
+            index=0,
+            containing_service=None,
+            input_type=_PINGREQUEST,
+            output_type=_EVENTRESPONSE,
+            options=None,
+        ),
+        _descriptor.MethodDescriptor(
+            name='register',
+            full_name='leap.common.events.EventsServerService.register',
+            index=1,
+            containing_service=None,
+            input_type=_REGISTERREQUEST,
+            output_type=_EVENTRESPONSE,
+            options=None,
+        ),
+        _descriptor.MethodDescriptor(
+            name='unregister',
+            full_name='leap.common.events.EventsServerService.unregister',
+            index=2,
+            containing_service=None,
+            input_type=_UNREGISTERREQUEST,
+            output_type=_EVENTRESPONSE,
+            options=None,
+        ),
+        _descriptor.MethodDescriptor(
+            name='signal',
+            full_name='leap.common.events.EventsServerService.signal',
+            index=3,
+            containing_service=None,
+            input_type=_SIGNALREQUEST,
+            output_type=_EVENTRESPONSE,
+            options=None,
+        ),
+    ])
 
 
-class EventsServerService(service.Service):
+class EventsServerService(_service.Service):
     __metaclass__ = service_reflection.GeneratedServiceType
     DESCRIPTOR = _EVENTSSERVERSERVICE
 
@@ -338,34 +449,43 @@ class EventsServerService_Stub(EventsServerService):
     DESCRIPTOR = _EVENTSSERVERSERVICE
 
 
-_EVENTSCOMPONENTSERVICE = descriptor.ServiceDescriptor(
-  name='EventsComponentService',
-  full_name='leap.common.events.EventsComponentService',
-  file=DESCRIPTOR,
-  index=1,
-  options=None,
-  serialized_start=981,
-  serialized_end=1085,
-  methods=[
-  descriptor.MethodDescriptor(
-    name='signal',
-    full_name='leap.common.events.EventsComponentService.signal',
-    index=0,
-    containing_service=None,
-    input_type=_SIGNALREQUEST,
-    output_type=_EVENTRESPONSE,
+_EVENTSCLIENTSERVICE = _descriptor.ServiceDescriptor(
+    name='EventsClientService',
+    full_name='leap.common.events.EventsClientService',
+    file=DESCRIPTOR,
+    index=1,
     options=None,
-  ),
-])
+    serialized_start=1271,
+    serialized_end=1448,
+    methods=[
+        _descriptor.MethodDescriptor(
+            name='ping',
+            full_name='leap.common.events.EventsClientService.ping',
+            index=0,
+            containing_service=None,
+            input_type=_PINGREQUEST,
+            output_type=_EVENTRESPONSE,
+            options=None,
+        ),
+        _descriptor.MethodDescriptor(
+            name='signal',
+            full_name='leap.common.events.EventsClientService.signal',
+            index=1,
+            containing_service=None,
+            input_type=_SIGNALREQUEST,
+            output_type=_EVENTRESPONSE,
+            options=None,
+        ),
+    ])
 
 
-class EventsComponentService(service.Service):
+class EventsClientService(_service.Service):
     __metaclass__ = service_reflection.GeneratedServiceType
-    DESCRIPTOR = _EVENTSCOMPONENTSERVICE
+    DESCRIPTOR = _EVENTSCLIENTSERVICE
 
 
-class EventsComponentService_Stub(EventsComponentService):
+class EventsClientService_Stub(EventsClientService):
     __metaclass__ = service_reflection.GeneratedServiceStubType
-    DESCRIPTOR = _EVENTSCOMPONENTSERVICE
+    DESCRIPTOR = _EVENTSCLIENTSERVICE
 
 # @@protoc_insertion_point(module_scope)
diff --git a/src/leap/common/events/server.py b/src/leap/common/events/server.py
index 1f3a874..59f3454 100644
--- a/src/leap/common/events/server.py
+++ b/src/leap/common/events/server.py
@@ -17,12 +17,12 @@
 """
 A server for the events mechanism.
 
-A server can receive different kinds of requests from components:
+A server can receive different kinds of requests from clients:
 
-  1. Registration request: store component port number to be notified when
+  1. Registration request: store client port number to be notified when
      a specific signal arrives.
 
-  2. Signal request: redistribute the signal to registered components.
+  2. Signal request: redistribute the signal to registered clients.
 """
 import logging
 import socket
@@ -40,12 +40,19 @@ logger = logging.getLogger(__name__)
 
 SERVER_PORT = 8090
 
-# the `registered_components` dictionary below should have the following
+# the `registered_clients` dictionary below should have the following
 # format:
 #
 #     { event_signal: [ port, ... ], ... }
 #
-registered_components = {}
+registered_clients = {}
+
+
+class PortAlreadyTaken(Exception):
+    """
+    Raised when trying to open a server in a port that is already taken.
+    """
+    pass
 
 
 def ensure_server(port=SERVER_PORT):
@@ -60,71 +67,150 @@ def ensure_server(port=SERVER_PORT):
 
     :return: the daemon instance or nothing
     :rtype: EventsServerDaemon or None
+
+    :raise PortAlreadyTaken: Raised if C{port} is already taken by something
+                             that is not an events server.
     """
     try:
+        # check if port is available
         s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         s.connect(('localhost', port))
         s.close()
-        logger.info('Server is already running on port %d.', port)
-        return None
+        # port is taken, check if there's a server running there
+        response = ping(port)
+        if response is not None and response.status == proto.EventResponse.OK:
+            logger.info('A server is already running on port %d.', port)
+            return None
+        # port is taken, and not by an events server
+        logger.info('Port %d is taken by something not an events server.', port)
+        raise PortAlreadyTaken(port)
     except socket.error:
+        # port is available, run a server
         logger.info('Launching server on port %d.', port)
         return EventsServerDaemon.ensure(port)
 
 
+def ping(port=SERVER_PORT, reqcbk=None, timeout=1000):
+    """
+    Ping the server.
+
+    :param port: the port in which server should be listening
+    :type port: int
+    :param reqcbk: a callback to be called when a response from server is
+                   received
+    :type reqcbk: function(proto.PingRequest, proto.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
+    """
+    request = proto.PingRequest()
+    service = RpcService(
+        proto.EventsServerService_Stub,
+        port,
+        'localhost')
+    logger.info("Pinging server in port %d..." % port)
+    return service.ping(request, callback=reqcbk, timeout=timeout)
+
+
 class EventsServerService(proto.EventsServerService):
     """
-    Service for receiving events in components.
+    Service for receiving events in clients.
     """
 
     def register(self, controller, request, done):
         """
-        Register a component port to be signaled when specific events come in.
+        Register a client port to be signaled when specific events come in.
 
         :param controller: used to mediate a single method call
         :type controller: protobuf.socketrpc.controller.SocketRpcController
-        :param request: the request received from the component
+        :param request: the request received from the client
         :type request: leap.common.events.events_pb2.RegisterRequest
         :param done: callback to be called when done
         :type done: protobuf.socketrpc.server.Callback
         """
         logger.info("Received registration request: %s..." % str(request)[:40])
-        # add component port to signal list
-        if request.event not in registered_components:
-            registered_components[request.event] = set([])
-        registered_components[request.event].add(request.port)
-        # send response back to component
+        # add client port to signal list
+        if request.event not in registered_clients:
+            registered_clients[request.event] = set([])
+        registered_clients[request.event].add(request.port)
+        # send response back to client
 
         logger.debug('sending response back')
         response = proto.EventResponse()
         response.status = proto.EventResponse.OK
         done.run(response)
 
+    def unregister(self, controller, request, done):
+        """
+        Unregister a client port so it will not be signaled when specific
+        events come in.
+
+        :param controller: used to mediate a single method call
+        :type controller: protobuf.socketrpc.controller.SocketRpcController
+        :param request: the request received from the client
+        :type request: leap.common.events.events_pb2.RegisterRequest
+        :param done: callback to be called when done
+        :type done: protobuf.socketrpc.server.Callback
+        """
+        logger.info(
+            "Received unregistration request: %s..." % str(request)[:40])
+        # remove client port from signal list
+        response = proto.EventResponse()
+        if request.event in registered_clients:
+            try:
+                registered_clients[request.event].remove(request.port)
+                response.status = proto.EventResponse.OK
+            except KeyError:
+                response.status = proto.EventsResponse.ERROR
+                response.result = 'Port %d not registered.' % request.port
+        # send response back to client
+        logger.debug('sending response back')
+        done.run(response)
+
     def signal(self, controller, request, done):
         """
-        Perform an RPC call to signal all components registered to receive a
+        Perform an RPC call to signal all clients registered to receive a
         specific signal.
 
         :param controller: used to mediate a single method call
         :type controller: protobuf.socketrpc.controller.SocketRpcController
-        :param request: the request received from the component
+        :param request: the request received from the client
         :type request: leap.common.events.events_pb2.SignalRequest
         :param done: callback to be called when done
         :type done: protobuf.socketrpc.server.Callback
         """
-        logger.info('Received signal from component: %s...', str(request)[:40])
-        # send signal to all registered components
+        logger.info('Received signal from client: %s...', str(request)[:40])
+        # send signal to all registered clients
         # TODO: verify signal auth
-        if request.event in registered_components:
-            for port in registered_components[request.event]:
+        if request.event in registered_clients:
+            for port in registered_clients[request.event]:
 
                 def callback(req, resp):
                     logger.info("Signal received by " + str(port))
 
-                service = RpcService(proto.EventsComponentService_Stub,
+                service = RpcService(proto.EventsClientService_Stub,
                                      port, 'localhost')
                 service.signal(request, callback=callback)
-        # send response back to component
+        # send response back to client
+        response = proto.EventResponse()
+        response.status = proto.EventResponse.OK
+        done.run(response)
+
+    def ping(self, controller, request, done):
+        """
+        Reply to a ping request.
+
+        :param controller: used to mediate a single method call
+        :type controller: protobuf.socketrpc.controller.SocketRpcController
+        :param request: the request received from the client
+        :type request: leap.common.events.events_pb2.RegisterRequest
+        :param done: callback to be called when done
+        :type done: protobuf.socketrpc.server.Callback
+        """
+        logger.info("Received ping request, sending response.")
         response = proto.EventResponse()
         response.status = proto.EventResponse.OK
         done.run(response)