2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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
101 * @param flag flag specifying the type of the client
104 GAS_performance_add_client (struct GNUNET_SERVER_Client *client,
107 struct PerformanceClient *pc;
109 GNUNET_break (NULL == find_client (client));
110 pc = GNUNET_malloc (sizeof (struct PerformanceClient));
113 GNUNET_SERVER_notification_context_add (nc, client);
114 GNUNET_SERVER_client_keep (client);
115 GNUNET_CONTAINER_DLL_insert (pc_head, pc_tail, pc);
120 * Unregister a client (which may have been a performance client,
121 * but this is not assured).
123 * @param client handle of the (now dead) client
126 GAS_performance_remove_client (struct GNUNET_SERVER_Client *client)
128 struct PerformanceClient *pc;
130 pc = find_client (client);
133 GNUNET_CONTAINER_DLL_remove (pc_head, pc_tail, pc);
134 GNUNET_SERVER_client_drop (client);
140 * Transmit the given performance information to all performance
143 * @param peer peer for which this is an address suggestion
144 * @param plugin_name 0-termintated string specifying the transport plugin
145 * @param plugin_addr binary address for the plugin to use
146 * @param plugin_addr_len number of bytes in plugin_addr
147 * @param atsi performance data for the address
148 * @param atsi_count number of performance records in 'ats'
149 * @param bandwidth_out assigned outbound bandwidth
150 * @param bandwidth_in assigned inbound bandwidth
153 GAS_performance_notify_clients (const struct GNUNET_PeerIdentity *peer,
154 const char *plugin_name,
155 const void *plugin_addr, size_t plugin_addr_len,
156 const struct GNUNET_ATS_Information *atsi,
158 struct GNUNET_BANDWIDTH_Value32NBO
160 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
162 struct PerformanceClient *pc;
163 struct PeerInformationMessage *msg;
164 size_t plugin_name_length = strlen (plugin_name) + 1;
166 sizeof (struct PeerInformationMessage) +
167 atsi_count * sizeof (struct GNUNET_ATS_Information) + plugin_addr_len +
170 struct GNUNET_ATS_Information *atsp;
173 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
174 GNUNET_assert (atsi_count <
175 GNUNET_SERVER_MAX_MESSAGE_SIZE /
176 sizeof (struct GNUNET_ATS_Information));
177 msg = (struct PeerInformationMessage *) buf;
178 msg->header.size = htons (msize);
179 msg->header.type = htons (GNUNET_MESSAGE_TYPE_ATS_PEER_INFORMATION);
180 msg->ats_count = htonl (atsi_count);
182 msg->address_length = htons (plugin_addr_len);
183 msg->plugin_name_length = htons (plugin_name_length);
184 msg->bandwidth_out = bandwidth_out;
185 msg->bandwidth_in = bandwidth_in;
186 atsp = (struct GNUNET_ATS_Information *) &msg[1];
187 memcpy (atsp, atsi, sizeof (struct GNUNET_ATS_Information) * atsi_count);
188 addrp = (char *) &atsp[atsi_count];
189 memcpy (addrp, plugin_addr, plugin_addr_len);
190 strcpy (&addrp[plugin_addr_len], plugin_name);
191 for (pc = pc_head; pc != NULL; pc = pc->next)
192 if (pc->flag == START_FLAG_PERFORMANCE_WITH_PIC)
194 GNUNET_SERVER_notification_context_unicast (nc, pc->client, &msg->header,
196 GNUNET_STATISTICS_update (GSA_stats,
197 "# performance updates given to clients", 1,
204 * Handle 'reservation request' messages from clients.
206 * @param cls unused, NULL
207 * @param client client that sent the request
208 * @param message the request message
211 GAS_handle_reservation_request (void *cls, struct GNUNET_SERVER_Client *client,
212 const struct GNUNET_MessageHeader *message)
214 const struct ReservationRequestMessage *msg =
215 (const struct ReservationRequestMessage *) message;
216 struct ReservationResultMessage result;
218 struct GNUNET_TIME_Relative res_delay;
220 if (NULL == find_client (client))
222 /* missing start message! */
224 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n",
228 "RESERVATION_REQUEST");
229 amount = (int32_t) ntohl (msg->amount);
230 res_delay = GAS_reservations_reserve (&msg->peer, amount);
231 if (res_delay.rel_value > 0)
233 result.header.size = htons (sizeof (struct ReservationResultMessage));
234 result.header.type = htons (GNUNET_MESSAGE_TYPE_ATS_RESERVATION_RESULT);
235 result.amount = htonl (amount);
236 result.peer = msg->peer;
237 result.res_delay = GNUNET_TIME_relative_hton (res_delay);
238 GNUNET_STATISTICS_update (GSA_stats, "# reservation requests processed", 1,
240 GNUNET_SERVER_notification_context_unicast (nc, client, &result.header,
242 GNUNET_SERVER_receive_done (client, GNUNET_OK);
247 * Handle 'preference change' messages from clients.
249 * @param cls unused, NULL
250 * @param client client that sent the request
251 * @param message the request message
254 GAS_handle_preference_change (void *cls, struct GNUNET_SERVER_Client *client,
255 const struct GNUNET_MessageHeader *message)
257 const struct ChangePreferenceMessage *msg;
258 const struct PreferenceInformation *pi;
263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n",
264 "PREFERENCE_CHANGE");
265 msize = ntohs (message->size);
266 if (msize < sizeof (struct ChangePreferenceMessage))
269 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
272 msg = (const struct ChangePreferenceMessage *) message;
273 nump = ntohl (msg->num_preferences);
275 sizeof (struct ChangePreferenceMessage) +
276 nump * sizeof (struct PreferenceInformation))
279 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
282 GNUNET_STATISTICS_update (GSA_stats, "# preference change requests processed",
284 pi = (const struct PreferenceInformation *) &msg[1];
285 for (i = 0; i < nump; i++)
286 GAS_addresses_change_preference (&msg->peer,
287 (enum GNUNET_ATS_PreferenceKind)
288 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 */