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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
87 * Type of a function to call when we receive a message
91 * @param message received message; NULL on timeout or fatal error
94 receive_handler (void *cls,
95 const struct GNUNET_MessageHeader *message)
97 struct GNUNET_TESTBED_BarrierWaitHandle *h = cls;
98 const struct GNUNET_TESTBED_BarrierStatusMsg *msg;
106 if (GNUNET_MESSAGE_TYPE_TESTBED_BARRIER_STATUS != ntohs (message->type))
111 msize = ntohs (message->size);
112 if (msize <= sizeof (struct GNUNET_TESTBED_BarrierStatusMsg))
117 msg = (const struct GNUNET_TESTBED_BarrierStatusMsg *) message;
118 switch (ntohs (msg->status))
120 case GNUNET_TESTBED_BARRIERSTATUS_ERROR:
122 case GNUNET_TESTBED_BARRIERSTATUS_INITIALISED:
125 case GNUNET_TESTBED_BARRIERSTATUS_CROSSED:
126 h->cb (h->cls, h->name, GNUNET_OK);
133 h->cb (h->cls, h->name, GNUNET_SYSERR);
136 GNUNET_TESTBED_barrier_wait_cancel (h);
141 * Function called to notify a client about the connection
142 * begin ready to queue more data. "buf" will be
143 * NULL and "size" zero if the connection was closed for
144 * writing in the meantime.
147 * @param size number of bytes available in buf
148 * @param buf where the callee should write the message
149 * @return number of bytes written to buf
152 transmit_notify (void *cls, size_t size, void *buf)
154 struct GNUNET_TESTBED_BarrierWaitHandle *h = cls;
158 if ((0 == size) || (NULL == buf))
160 h->cb (h->cls, h->name, GNUNET_SYSERR);
161 GNUNET_TESTBED_barrier_wait_cancel (h);
164 msize = htons (h->msg->size);
165 GNUNET_assert (msize <= size);
166 (void) memcpy (buf, h->msg, msize);
167 GNUNET_free (h->msg);
169 GNUNET_CLIENT_receive (h->conn, &receive_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
175 * Wait for a barrier to be crossed. This function should be called by the
176 * peers which have been started by the testbed. If the peer is not started by
177 * testbed this function may return error
179 * @param name the name of the barrier
180 * @param cb the barrier wait callback
181 * @param cls the closure for the above callback
182 * @return barrier wait handle which can be used to cancel the waiting at
183 * anytime before the callback is called. NULL upon error.
185 struct GNUNET_TESTBED_BarrierWaitHandle *
186 GNUNET_TESTBED_barrier_wait (const char *name,
187 GNUNET_TESTBED_barrier_wait_cb cb,
190 struct GNUNET_TESTBED_BarrierWait *msg;
191 struct GNUNET_CONFIGURATION_Handle *cfg;
192 struct GNUNET_TESTBED_BarrierWaitHandle *h;
197 GNUNET_assert (NULL != cb);
198 GNUNET_assert (NULL != name);
199 cfg_filename = getenv (ENV_TESTBED_CONFIG);
200 if (NULL == cfg_filename)
202 LOG (GNUNET_ERROR_TYPE_ERROR, "Are you running under testbed?\n");
205 cfg = GNUNET_CONFIGURATION_create ();
206 if (GNUNET_OK != GNUNET_CONFIGURATION_load (cfg, cfg_filename))
208 LOG (GNUNET_ERROR_TYPE_ERROR, "Unable to load configuration from file `%s'\n",
210 GNUNET_CONFIGURATION_destroy (cfg);
213 h = GNUNET_new (struct GNUNET_TESTBED_BarrierWaitHandle);
214 h->name = GNUNET_strdup (name);
216 h->conn = GNUNET_CLIENT_connect ("testbed-barrier", h->cfg);
221 LOG (GNUNET_ERROR_TYPE_ERROR,
222 "Unable to connect to local testbed-barrier service\n");
223 GNUNET_TESTBED_barrier_wait_cancel (h);
226 name_len = strlen (name);
227 msize = sizeof (struct GNUNET_TESTBED_BarrierWait) + name_len;
228 msg = GNUNET_malloc (msize);
229 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TESTBED_BARRIER_WAIT);
230 msg->header.size = htons (msize);
231 (void) memcpy (msg->name, name, name_len);
232 h->msg = &msg->header;
234 GNUNET_CLIENT_notify_transmit_ready (h->conn, msize,
235 GNUNET_TIME_UNIT_FOREVER_REL,
244 * Cancel a barrier wait handle
246 * @param h the barrier wait handle
249 GNUNET_TESTBED_barrier_wait_cancel (struct GNUNET_TESTBED_BarrierWaitHandle *h)
251 GNUNET_free (h->name);
253 GNUNET_CLIENT_notify_transmit_ready_cancel (h->tx);
255 GNUNET_CLIENT_disconnect (h->conn);
257 GNUNET_free (h->msg);
258 GNUNET_CONFIGURATION_destroy (h->cfg);
262 /* end of testbed_api_barriers.c */