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/*
This file is part of GNUnet.
Copyright (C) 2008--2013 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file testbed/gnunet-service-testbed_links.h
* @brief TESTBED service components that deals with starting slave controllers
* and establishing lateral links between controllers
* @author Sree Harsha Totakura
*/
/**
* A connected controller which is not our child
*/
struct Neighbour;
/**
* Structure representing a connected(directly-linked) controller
*/
struct Slave
{
/**
* The controller process handle if we had started the controller
*/
struct GNUNET_TESTBED_ControllerProc *controller_proc;
/**
* The controller handle
*/
struct GNUNET_TESTBED_Controller *controller;
/**
* handle to lcc which is associated with this slave startup. Should be set to
* NULL when the slave has successfully started up
*/
struct LinkControllersContext *lcc;
/**
* Head of the host registration DLL
*/
struct HostRegistration *hr_dll_head;
/**
* Tail of the host registration DLL
*/
struct HostRegistration *hr_dll_tail;
/**
* The current host registration handle
*/
struct GNUNET_TESTBED_HostRegistrationHandle *rhandle;
/**
* Hashmap to hold Registered host contexts
*/
struct GNUNET_CONTAINER_MultiHashMap *reghost_map;
/**
* The id of the host this controller is running on
*/
uint32_t host_id;
};
/**
* A list of directly linked neighbours
*/
extern struct Slave **GST_slave_list;
/**
* The size of directly linked neighbours list
*/
extern unsigned int GST_slave_list_size;
/**
* Cleans up the neighbour list
*/
void
GST_neighbour_list_clean (void);
/**
* Get a neighbour from the neighbour list
*
* @param id the index of the neighbour in the neighbour list
* @return the Neighbour; NULL if the given index in invalid (index greater than
* the list size or neighbour at that index is NULL)
*/
struct Neighbour *
GST_get_neighbour (uint32_t id);
/**
* Function to cleanup the neighbour connect contexts
*/
void
GST_free_nccq (void);
/**
* Notification context to be used to notify when connection to the neighbour's
* controller is opened
*/
struct NeighbourConnectNotification;
/**
* The notification callback to call when we are connect to neighbour
*
* @param cls the closure given to GST_neighbour_get_connection()
* @param controller the controller handle to the neighbour
*/
typedef void
(*GST_NeigbourConnectNotifyCallback) (void *cls,
struct GNUNET_TESTBED_Controller *controller);
/**
* Try to open a connection to the given neigbour. If the connection is open
* already, then it is re-used. If not, the request is queued in the operation
* queues responsible for bounding the total number of file descriptors. The
* actual connection will happen when the operation queue marks the
* corresponding operation as active.
*
* @param n the neighbour to open a connection to
* @param cb the notification callback to call when the connection is opened
* @param cb_cls the closure for the above callback
*/
struct NeighbourConnectNotification *
GST_neighbour_get_connection (struct Neighbour *n,
GST_NeigbourConnectNotifyCallback cb,
void *cb_cls);
/**
* Cancel the request for opening a connection to the neighbour
*
* @param h the notification handle
*/
void
GST_neighbour_get_connection_cancel (struct NeighbourConnectNotification *h);
/**
* Release the connection to the neighbour. The actual connection will be
* closed if connections to other neighbour are waiting (to maintain a bound on
* the total number of connections that are open).
*
* @param n the neighbour whose connection can be closed
*/
void
GST_neighbour_release_connection (struct Neighbour *n);
/**
* Function to create a neigbour and add it into the neighbour list
*
* @param host the host of the neighbour
*/
struct Neighbour *
GST_create_neighbour (struct GNUNET_TESTBED_Host *host);
/**
* Message handler for #GNUNET_MESSAGE_TYPE_TESTBED_LCONTROLLERS message
*
* @param cls identification of the client
* @param msg the actual message
*/
void
handle_link_controllers (void *cls,
const struct GNUNET_TESTBED_ControllerLinkRequest *msg);
/**
* Clean up @a client handle if we stored any via #handle_link_controllers(),
* the given client disconnected.
*
* @param client the client that is history
*/
void
GST_link_notify_disconnect (struct GNUNET_SERVICE_Client *client);
/**
* Cleans up the slave list
*/
void
GST_slave_list_clear (void);
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