2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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22 * @file ats/gnunet-service-ats_performance.c
23 * @brief ats service, interaction with 'performance' API
24 * @author Matthias Wachs
25 * @author Christian Grothoff
28 #include "gnunet-service-ats.h"
29 #include "gnunet-service-ats_addresses.h"
30 #include "gnunet-service-ats_performance.h"
31 #include "gnunet-service-ats_reservations.h"
36 * We keep clients that are interested in performance in a linked list.
38 struct PerformanceClient
41 * Next in doubly-linked list.
43 struct PerformanceClient * next;
46 * Previous in doubly-linked list.
48 struct PerformanceClient * prev;
51 * Actual handle to the client.
53 struct GNUNET_SERVER_Client *client;
56 * Options for the client.
64 * Head of linked list of all clients to this service.
66 static struct PerformanceClient *pc_head;
69 * Tail of linked list of all clients to this service.
71 static struct PerformanceClient *pc_tail;
74 * Context for sending messages to performance clients.
76 static struct GNUNET_SERVER_NotificationContext *nc;
80 * Find the performance client associated with the given handle.
82 * @param client server handle
83 * @return internal handle
85 static struct PerformanceClient *
86 find_client (struct GNUNET_SERVER_Client *client)
88 struct PerformanceClient * pc;
90 for (pc = pc_head; pc != NULL; pc = pc->next)
91 if (pc->client == client)
98 * Register a new performance client.
100 * @param client handle of the new client
103 GAS_performance_add_client (struct GNUNET_SERVER_Client *client,
106 struct PerformanceClient * pc;
108 GNUNET_break (NULL == find_client (client));
109 pc = GNUNET_malloc (sizeof (struct PerformanceClient));
112 GNUNET_SERVER_notification_context_add (nc, client);
113 GNUNET_SERVER_client_keep (client);
114 GNUNET_CONTAINER_DLL_insert(pc_head, pc_tail, pc);
119 * Unregister a client (which may have been a performance client,
120 * but this is not assured).
122 * @param client handle of the (now dead) client
125 GAS_performance_remove_client (struct GNUNET_SERVER_Client *client)
127 struct PerformanceClient * pc;
129 pc = find_client (client);
132 GNUNET_CONTAINER_DLL_remove (pc_head, pc_tail, pc);
133 GNUNET_SERVER_client_drop (client);
139 * Transmit the given performance information to all performance
142 * @param peer peer for which this is an address suggestion
143 * @param plugin_name 0-termintated string specifying the transport plugin
144 * @param plugin_addr binary address for the plugin to use
145 * @param plugin_addr_len number of bytes in plugin_addr
146 * @param atsi performance data for the address
147 * @param atsi_count number of performance records in 'ats'
148 * @param bandwidth_out assigned outbound bandwidth
149 * @param bandwidth_in assigned inbound bandwidth
152 GAS_performance_notify_clients (const struct GNUNET_PeerIdentity *peer,
153 const char *plugin_name,
154 const void *plugin_addr, size_t plugin_addr_len,
155 const struct GNUNET_ATS_Information *atsi,
157 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
158 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
160 struct PerformanceClient *pc;
161 struct PeerInformationMessage *msg;
162 size_t plugin_name_length = strlen (plugin_name) + 1;
163 size_t msize = sizeof (struct PeerInformationMessage) + atsi_count * sizeof (struct GNUNET_ATS_Information)
164 + plugin_addr_len + plugin_name_length;
166 struct GNUNET_ATS_Information *atsp;
169 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
170 GNUNET_assert (atsi_count < GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_ATS_Information));
171 msg = (struct PeerInformationMessage*) buf;
172 msg->header.size = htons (msize);
173 msg->header.type = htons (GNUNET_MESSAGE_TYPE_ATS_PEER_INFORMATION);
174 msg->ats_count = htonl (atsi_count);
176 msg->address_length = htons (plugin_addr_len);
177 msg->plugin_name_length = htons (plugin_name_length);
178 msg->bandwidth_out = bandwidth_out;
179 msg->bandwidth_in = bandwidth_in;
180 atsp = (struct GNUNET_ATS_Information* ) &msg[1];
181 memcpy (atsp, atsi, sizeof (struct GNUNET_ATS_Information) * atsi_count);
182 addrp = (char*) &atsp[atsi_count];
183 memcpy (addrp, plugin_addr, plugin_addr_len);
184 strcpy (&addrp[plugin_addr_len], plugin_name);
185 for (pc = pc_head; pc != NULL; pc = pc->next)
186 if (pc->flag == START_FLAG_PERFORMANCE_WITH_PIC)
188 GNUNET_SERVER_notification_context_unicast (nc,
192 GNUNET_STATISTICS_update (GSA_stats,
193 "# performance updates given to clients",
201 * Handle 'reservation request' messages from clients.
203 * @param cls unused, NULL
204 * @param client client that sent the request
205 * @param message the request message
208 GAS_handle_reservation_request (void *cls, struct GNUNET_SERVER_Client *client,
209 const struct GNUNET_MessageHeader *message)
211 const struct ReservationRequestMessage * msg = (const struct ReservationRequestMessage *) message;
212 struct ReservationResultMessage result;
214 struct GNUNET_TIME_Relative res_delay;
216 if (NULL == find_client (client))
218 /* missing start message! */
220 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
224 "Received `%s' message\n",
225 "RESERVATION_REQUEST");
226 amount = (int32_t) ntohl (msg->amount);
227 res_delay = GAS_reservations_reserve (&msg->peer,
229 if (res_delay.rel_value > 0)
231 result.header.size = htons (sizeof (struct ReservationResultMessage));
232 result.header.type = htons (GNUNET_MESSAGE_TYPE_ATS_RESERVATION_RESULT);
233 result.amount = htonl (amount);
234 result.peer = msg->peer;
235 result.res_delay = GNUNET_TIME_relative_hton (res_delay);
236 GNUNET_STATISTICS_update (GSA_stats,
237 "# reservation requests processed",
240 GNUNET_SERVER_notification_context_unicast (nc,
244 GNUNET_SERVER_receive_done (client, GNUNET_OK);
249 * Handle 'preference change' messages from clients.
251 * @param cls unused, NULL
252 * @param client client that sent the request
253 * @param message the request message
256 GAS_handle_preference_change (void *cls, struct GNUNET_SERVER_Client *client,
257 const struct GNUNET_MessageHeader *message)
259 const struct ChangePreferenceMessage * msg;
260 const struct PreferenceInformation *pi;
265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "PREFERENCE_CHANGE");
266 msize = ntohs (message->size);
267 if (msize < sizeof (struct ChangePreferenceMessage))
270 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
273 msg = (const struct ChangePreferenceMessage *) message;
274 nump = ntohl (msg->num_preferences);
275 if (msize != sizeof (struct ChangePreferenceMessage) + nump * sizeof (struct PreferenceInformation))
278 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
281 GNUNET_STATISTICS_update (GSA_stats,
282 "# preference change requests processed",
285 pi = (const struct PreferenceInformation *) &msg[1];
287 GAS_addresses_change_preference (&msg->peer,
288 (enum GNUNET_ATS_PreferenceKind) ntohl (pi[i].preference_kind),
289 pi[i].preference_value);
290 GNUNET_SERVER_receive_done (client, GNUNET_OK);
295 * Initialize performance subsystem.
297 * @param server handle to our server
300 GAS_performance_init (struct GNUNET_SERVER_Handle *server)
302 nc = GNUNET_SERVER_notification_context_create (server, 128);
307 * Shutdown performance subsystem.
310 GAS_performance_done ()
312 GNUNET_SERVER_notification_context_destroy (nc);
316 /* end of gnunet-service-ats_performance.c */