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13 Affero General Public License for more details.
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18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @file peerinfo/peerinfo_api_notify.c
23 * @brief notify API to access peerinfo service
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_peerinfo_service.h"
29 #include "gnunet_protocols.h"
32 #define LOG(kind, ...) GNUNET_log_from (kind, "peerinfo-api", __VA_ARGS__)
35 * Context for the info handler.
37 struct GNUNET_PEERINFO_NotifyContext
40 * Our connection to the PEERINFO service.
42 struct GNUNET_MQ_Handle *mq;
45 * Function to call with information.
47 GNUNET_PEERINFO_Processor callback;
50 * Closure for @e callback.
57 const struct GNUNET_CONFIGURATION_Handle *cfg;
60 * Tasked used for delayed re-connection attempt.
62 struct GNUNET_SCHEDULER_Task *task;
65 * Include friend only HELLOs in callbacks
67 int include_friend_only;
72 * Task to re-try connecting to peerinfo.
74 * @param cls the `struct GNUNET_PEERINFO_NotifyContext *`
77 reconnect (void *cls);
81 * We encountered an error, reconnect to the service.
83 * @param nc context to reconnect
86 do_reconnect (struct GNUNET_PEERINFO_NotifyContext *nc)
88 GNUNET_MQ_destroy (nc->mq);
90 nc->task = GNUNET_SCHEDULER_add_now (&reconnect,
96 * We got a disconnect after asking regex to do the announcement.
99 * @param cls the `struct GNUNET_PEERINFO_NotifyContext` to retry
100 * @param error error code
103 mq_error_handler (void *cls,
104 enum GNUNET_MQ_Error error)
106 struct GNUNET_PEERINFO_NotifyContext *nc = cls;
113 * Check that a peerinfo information message is well-formed.
116 * @param im message received
117 * @return #GNUNET_OK if the message is well-formed
120 check_notification (void *cls,
121 const struct InfoMessage *im)
123 uint16_t ms = ntohs (im->header.size) - sizeof(*im);
125 if (ms >= sizeof(struct GNUNET_MessageHeader))
127 const struct GNUNET_HELLO_Message *hello;
129 hello = (const struct GNUNET_HELLO_Message *) &im[1];
130 if (ms != GNUNET_HELLO_size (hello))
133 return GNUNET_SYSERR;
140 return GNUNET_SYSERR;
142 return GNUNET_OK; /* odd... */
147 * Receive a peerinfo information message, process it.
150 * @param im message received
153 handle_notification (void *cls,
154 const struct InfoMessage *im)
156 struct GNUNET_PEERINFO_NotifyContext *nc = cls;
157 const struct GNUNET_HELLO_Message *hello;
158 uint16_t ms = ntohs (im->header.size) - sizeof(struct InfoMessage);
162 hello = (const struct GNUNET_HELLO_Message *) &im[1];
163 LOG (GNUNET_ERROR_TYPE_DEBUG,
164 "Received information about peer `%s' from peerinfo database\n",
165 GNUNET_i2s (&im->peer));
166 nc->callback (nc->callback_cls,
174 * Type of a function to call when we receive a message from the
175 * service. Call the iterator with the result and (if applicable)
176 * continue to receive more messages or trigger processing the next
177 * event (if applicable).
180 * @param msg message received, NULL on timeout or fatal error
183 handle_end_iteration (void *cls,
184 const struct GNUNET_MessageHeader *msg)
186 /* these are ignored by the notify API */
191 * Task to re-try connecting to peerinfo.
193 * @param cls the `struct GNUNET_PEERINFO_NotifyContext *`
196 reconnect (void *cls)
198 struct GNUNET_PEERINFO_NotifyContext *nc = cls;
199 struct GNUNET_MQ_MessageHandler handlers[] = {
200 GNUNET_MQ_hd_var_size (notification,
201 GNUNET_MESSAGE_TYPE_PEERINFO_INFO,
204 GNUNET_MQ_hd_fixed_size (end_iteration,
205 GNUNET_MESSAGE_TYPE_PEERINFO_INFO_END,
206 struct GNUNET_MessageHeader,
208 GNUNET_MQ_handler_end ()
210 struct GNUNET_MQ_Envelope *env;
211 struct NotifyMessage *nm;
214 nc->mq = GNUNET_CLIENT_connect (nc->cfg,
221 env = GNUNET_MQ_msg (nm,
222 GNUNET_MESSAGE_TYPE_PEERINFO_NOTIFY);
223 nm->include_friend_only = htonl (nc->include_friend_only);
224 GNUNET_MQ_send (nc->mq,
230 * Call a method whenever our known information about peers
231 * changes. Initially calls the given function for all known
232 * peers and then only signals changes.
234 * If @a include_friend_only is set to #GNUNET_YES peerinfo will include HELLO
235 * messages which are intended for friend to friend mode and which do not
236 * have to be gossiped. Otherwise these messages are skipped.
238 * @param cfg configuration to use
239 * @param include_friend_only include HELLO messages for friends only
240 * @param callback the method to call for each peer
241 * @param callback_cls closure for @a callback
242 * @return NULL on error
244 struct GNUNET_PEERINFO_NotifyContext *
245 GNUNET_PEERINFO_notify (const struct GNUNET_CONFIGURATION_Handle *cfg,
246 int include_friend_only,
247 GNUNET_PEERINFO_Processor callback,
250 struct GNUNET_PEERINFO_NotifyContext *nc;
252 nc = GNUNET_new (struct GNUNET_PEERINFO_NotifyContext);
254 nc->callback = callback;
255 nc->callback_cls = callback_cls;
256 nc->include_friend_only = include_friend_only;
260 LOG (GNUNET_ERROR_TYPE_WARNING,
261 "Could not connect to PEERINFO service.\n");
270 * Stop notifying about changes.
272 * @param nc context to stop notifying
275 GNUNET_PEERINFO_notify_cancel (struct GNUNET_PEERINFO_NotifyContext *nc)
279 GNUNET_MQ_destroy (nc->mq);
282 if (NULL != nc->task)
284 GNUNET_SCHEDULER_cancel (nc->task);
291 /* end of peerinfo_api_notify.c */