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22 * @file testbed/testbed_api_barriers.c
23 * @brief API implementation for testbed barriers
24 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
27 #include "gnunet_testbed_service.h"
28 #include "testbed_api.h"
33 #define LOG(type, ...) \
34 GNUNET_log_from (type, "testbed-api-barriers", __VA_ARGS__);
37 * Debug logging shorthand
39 #define LOG_DEBUG(...) \
40 LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__);
46 struct GNUNET_TESTBED_BarrierWaitHandle
49 * The name of the barrier
54 * Then configuration used for the client connection
56 struct GNUNET_CONFIGURATION_Handle *cfg;
59 * The client connection
61 struct GNUNET_CLIENT_Connection *conn;
66 struct GNUNET_CLIENT_TransmitHandle *tx;
69 * The message to transmit with tx
71 struct GNUNET_MessageHeader *msg;
74 * The barrier wait callback
76 GNUNET_TESTBED_barrier_wait_cb cb;
79 * The closure for the above callback
86 * Function to destroy barrier wait handle
88 * @param h the handle to destroy
91 destroy_handle (struct GNUNET_TESTBED_BarrierWaitHandle *h)
93 GNUNET_free (h->name);
95 GNUNET_CLIENT_notify_transmit_ready_cancel (h->tx);
97 GNUNET_CLIENT_disconnect (h->conn);
100 GNUNET_CONFIGURATION_destroy (h->cfg);
106 * Type of a function to call when we receive a message
110 * @param message received message; NULL on timeout or fatal error
113 receive_handler (void *cls,
114 const struct GNUNET_MessageHeader *message)
116 struct GNUNET_TESTBED_BarrierWaitHandle *h = cls;
117 const struct GNUNET_TESTBED_BarrierStatusMsg *msg;
125 if (GNUNET_MESSAGE_TYPE_TESTBED_BARRIER_STATUS != ntohs (message->type))
130 msize = ntohs (message->size);
131 if (msize <= sizeof (struct GNUNET_TESTBED_BarrierStatusMsg))
136 msg = (const struct GNUNET_TESTBED_BarrierStatusMsg *) message;
137 switch (ntohs (msg->status))
139 case GNUNET_TESTBED_BARRIERSTATUS_ERROR:
141 case GNUNET_TESTBED_BARRIERSTATUS_INITIALISED:
142 GNUNET_break (0); /* FIXME */
144 case GNUNET_TESTBED_BARRIERSTATUS_CROSSED:
145 h->cb (h->cls, h->name, GNUNET_OK);
152 h->cb (h->cls, h->name, GNUNET_SYSERR);
160 * Function called to notify a client about the connection
161 * begin ready to queue more data. "buf" will be
162 * NULL and "size" zero if the connection was closed for
163 * writing in the meantime.
166 * @param size number of bytes available in buf
167 * @param buf where the callee should write the message
168 * @return number of bytes written to buf
171 transmit_notify (void *cls, size_t size, void *buf)
173 struct GNUNET_TESTBED_BarrierWaitHandle *h = cls;
177 if ((0 == size) || (NULL == buf))
182 msize = htons (h->msg->size);
183 GNUNET_assert (msize <= size);
184 (void) memcpy (buf, h->msg, msize);
185 GNUNET_free (h->msg);
187 GNUNET_CLIENT_receive (h->conn, &receive_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
193 * Wait for a barrier to be crossed. This function should be called by the
194 * peers which have been started by the testbed. If the peer is not started by
195 * testbed this function may return error
197 * @param name the name of the barrier
198 * @param cb the barrier wait callback
199 * @param cls the closure for the above callback
200 * @return barrier wait handle which can be used to cancel the waiting at
201 * anytime before the callback is called. NULL upon error.
203 struct GNUNET_TESTBED_BarrierWaitHandle *
204 GNUNET_TESTBED_barrier_wait (const char *name,
205 GNUNET_TESTBED_barrier_wait_cb cb,
208 struct GNUNET_TESTBED_BarrierWait *msg;
209 struct GNUNET_CONFIGURATION_Handle *cfg;
210 struct GNUNET_TESTBED_BarrierWaitHandle *h;
215 GNUNET_assert (NULL != cb);
216 GNUNET_assert (NULL != name);
217 cfg_filename = getenv (ENV_TESTBED_CONFIG);
218 if (NULL == cfg_filename)
220 LOG (GNUNET_ERROR_TYPE_ERROR, "Are you running under testbed?\n");
223 cfg = GNUNET_CONFIGURATION_create ();
224 if (GNUNET_OK != GNUNET_CONFIGURATION_load (cfg, cfg_filename))
226 LOG (GNUNET_ERROR_TYPE_ERROR, "Unable to load configuration from file `%s'\n",
228 GNUNET_CONFIGURATION_destroy (cfg);
231 h = GNUNET_new (struct GNUNET_TESTBED_BarrierWaitHandle);
232 h->name = GNUNET_strdup (name);
234 h->conn = GNUNET_CLIENT_connect ("testbed-barrier", h->cfg);
239 LOG (GNUNET_ERROR_TYPE_ERROR,
240 "Unable to connect to local testbed-barrier service\n");
244 name_len = strlen (name);
245 msize = sizeof (struct GNUNET_TESTBED_BarrierWait) + name_len;
246 msg = GNUNET_malloc (msize);
247 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TESTBED_BARRIER_WAIT);
248 msg->header.size = htons (msize);
249 (void) memcpy (msg->name, name, name_len);
250 h->msg = &msg->header;
252 GNUNET_CLIENT_notify_transmit_ready (h->conn, msize,
253 GNUNET_TIME_UNIT_FOREVER_REL,
262 * Cancel a barrier wait handle
264 * @param h the barrier wait handle
267 GNUNET_TESTBED_barrier_wait_cancel (struct GNUNET_TESTBED_BarrierWaitHandle *h)
272 /* end of testbed_api_barriers.c */