multiple operation queues for an operation
[oweals/gnunet.git] / src / testbed / testbed_api.c
index 9bed63a9779c469444e3e210fa32a887b2b472a8..c55e7373a00bc72ded931b034ce82b07ecb5d558 100644 (file)
@@ -239,11 +239,6 @@ struct ForwardedOperationData
  */
 struct GetSlaveConfigData
 {
-  /**
-   * The operation closure
-   */
-  void *op_cls;
-
   /**
    * The id of the slave controller
    */
@@ -262,11 +257,6 @@ struct ControllerLinkData
    */
   struct GNUNET_TESTBED_ControllerLinkMessage *msg;
 
-  /**
-   * The operation closure
-   */
-  void *op_cls;
-
 };
 
 
@@ -389,7 +379,7 @@ handle_opsuccess (struct GNUNET_TESTBED_Controller *c,
   uint64_t op_id;
 
   op_id = GNUNET_ntohll (msg->operation_id);
-  LOG_DEBUG ("Operation %ul successful\n", op_id);
+  LOG_DEBUG ("Operation %lu successful\n", op_id);
   if (NULL == (opc = find_opc (c, op_id)))
   {
     LOG_DEBUG ("Operation not found\n");
@@ -397,7 +387,7 @@ handle_opsuccess (struct GNUNET_TESTBED_Controller *c,
   }
   event.type = GNUNET_TESTBED_ET_OPERATION_FINISHED;
   event.details.operation_finished.operation = opc->op;
-  event.details.operation_finished.op_cls = NULL;
+  event.details.operation_finished.op_cls = opc->op_cls;
   event.details.operation_finished.emsg = NULL;
   event.details.operation_finished.generic = NULL;
   switch (opc->type)
@@ -425,7 +415,6 @@ handle_opsuccess (struct GNUNET_TESTBED_Controller *c,
       
       data = opc->data;
       GNUNET_assert (NULL != data);      
-      event.details.operation_finished.op_cls = data->op_cls;
       GNUNET_free (data);
       opc->data = NULL;
     }
@@ -440,6 +429,8 @@ handle_opsuccess (struct GNUNET_TESTBED_Controller *c,
     if (NULL != c->cc)
       c->cc (c->cc_cls, &event);
   }
+  else
+    LOG_DEBUG ("Not calling callback\n");
   return GNUNET_YES;
 }
 
@@ -733,13 +724,13 @@ handle_op_fail_event (struct GNUNET_TESTBED_Controller *c,
     LOG_DEBUG ("Operation not found\n");
     return GNUNET_YES;
   }
-  GNUNET_CONTAINER_DLL_remove (opc->c->ocq_head, opc->c->ocq_tail, opc);
   if (OP_FORWARDED == opc->type)
   {
     handle_forwarded_operation_msg (c, opc,
                                    (const struct GNUNET_MessageHeader *) msg);
     return GNUNET_YES;
   }
+  GNUNET_CONTAINER_DLL_remove (opc->c->ocq_head, opc->c->ocq_tail, opc);
   opc->state = OPC_STATE_FINISHED;
   emsg = GNUNET_TESTBED_parse_error_string_ (msg);
   if (NULL == emsg)
@@ -758,7 +749,7 @@ handle_op_fail_event (struct GNUNET_TESTBED_Controller *c,
   {
     event.type = GNUNET_TESTBED_ET_OPERATION_FINISHED;
     event.details.operation_finished.operation = opc->op;
-    event.details.operation_finished.op_cls = NULL;
+    event.details.operation_finished.op_cls = opc->op_cls;
     event.details.operation_finished.emsg = emsg;
     event.details.operation_finished.generic = NULL;
     c->cc (c->cc_cls, &event);
@@ -846,7 +837,6 @@ handle_slave_config (struct GNUNET_TESTBED_Controller *c,
                     const struct GNUNET_TESTBED_SlaveConfiguration * msg)
 {
   struct OperationContext *opc;
-  void *op_cls;
   uint64_t op_id;
   struct GNUNET_TESTBED_EventInformation event;  
 
@@ -860,8 +850,7 @@ handle_slave_config (struct GNUNET_TESTBED_Controller *c,
   {
     GNUNET_break (0);
     return GNUNET_YES;
-  }  
-  op_cls = ((struct GetSlaveConfigData *) opc->data)->op_cls;
+  }
   GNUNET_free (opc->data);
   opc->data = NULL;
   opc->state = OPC_STATE_FINISHED;
@@ -873,7 +862,7 @@ handle_slave_config (struct GNUNET_TESTBED_Controller *c,
     event.type = GNUNET_TESTBED_ET_OPERATION_FINISHED;   
     event.details.operation_finished.generic = opc->data;
     event.details.operation_finished.operation = opc->op;
-    event.details.operation_finished.op_cls = op_cls;
+    event.details.operation_finished.op_cls = opc->op_cls;
     event.details.operation_finished.emsg = NULL;
     c->cc (c->cc_cls, &event);
   }
@@ -959,7 +948,7 @@ handle_need_controller_config (struct GNUNET_TESTBED_Controller *c,
       uint64_t sub_op_id;
       
       GNUNET_assert (NULL == oc_data->sub_opc);
-      sub_op_id = oc_data->p1->controller->operation_counter++;
+      sub_op_id = GNUNET_TESTBED_get_next_op_id (oc_data->p1->controller);
       get_cfg_msg = 
           GNUNET_TESTBED_generate_slavegetconfig_msg_ 
           (sub_op_id, GNUNET_TESTBED_host_get_id_ (oc_data->p2->host));
@@ -1473,7 +1462,7 @@ GNUNET_TESTBED_controller_start (const char *controller_ip,
                              &helper_mst, &helper_exp_cb, cp);
   else
   {
-    char *remote_args[8];
+    char *remote_args[10];
     unsigned int argp;
     const char *username;
 
@@ -1491,10 +1480,12 @@ GNUNET_TESTBED_controller_start (const char *controller_ip,
     remote_args[argp++] = cp->port;
     remote_args[argp++] = "-o";
     remote_args[argp++] = "BatchMode=yes";
+    remote_args[argp++] = "-o";
+    remote_args[argp++] = "NoHostAuthenticationForLocalhost=yes";
     remote_args[argp++] = cp->dst;
     remote_args[argp++] = HELPER_TESTBED_BINARY_SSH;
     remote_args[argp++] = NULL;
-    GNUNET_assert (argp == 8);
+    GNUNET_assert (argp == 10);
     cp->helper =
         GNUNET_HELPER_start (GNUNET_NO, "ssh", remote_args, &helper_mst,
                              &helper_exp_cb, cp);
@@ -1575,6 +1566,7 @@ GNUNET_TESTBED_controller_connect (const struct GNUNET_CONFIGURATION_Handle
   unsigned long long max_parallel_operations;
   unsigned long long max_parallel_service_connections;
   unsigned long long max_parallel_topology_config_operations;
+  unsigned long long max_parallel_overlay_connect_operations;
 
   if (GNUNET_OK !=
       GNUNET_CONFIGURATION_get_value_number (cfg, "testbed",
@@ -1600,6 +1592,14 @@ GNUNET_TESTBED_controller_connect (const struct GNUNET_CONFIGURATION_Handle
     GNUNET_break (0);
     return NULL;
   }
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_number (cfg, "testbed",
+                                             "MAX_PARALLEL_OVERLAY_CONNECT_OPERATIONS",
+                                             &max_parallel_overlay_connect_operations))
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
   controller = GNUNET_malloc (sizeof (struct GNUNET_TESTBED_Controller));
   controller->cc = cc;
   controller->cc_cls = cc_cls;
@@ -1637,7 +1637,10 @@ GNUNET_TESTBED_controller_connect (const struct GNUNET_CONFIGURATION_Handle
                                               max_parallel_service_connections);
   controller->opq_parallel_topology_config_operations=
       GNUNET_TESTBED_operation_queue_create_ ((unsigned int)
-                                              max_parallel_service_connections);
+                                              max_parallel_topology_config_operations);
+  controller->opq_parallel_overlay_connect_operations=
+      GNUNET_TESTBED_operation_queue_create_ ((unsigned int)
+                                              max_parallel_overlay_connect_operations);
   controller_hostname = GNUNET_TESTBED_host_get_hostname_ (host);
   if (NULL == controller_hostname)
     controller_hostname = "127.0.0.1";
@@ -1692,6 +1695,8 @@ GNUNET_TESTBED_controller_configure_sharing (struct GNUNET_TESTBED_Controller
   memcpy (&msg[1], service_name, service_name_size);
   GNUNET_TESTBED_queue_message_ (controller,
                                  (struct GNUNET_MessageHeader *) msg);
+  GNUNET_break (0);             /* This function is not yet implemented on the
+                                   testbed service */
 }
 
 
@@ -1726,6 +1731,8 @@ GNUNET_TESTBED_controller_disconnect (struct GNUNET_TESTBED_Controller
       (controller->opq_parallel_service_connections);
   GNUNET_TESTBED_operation_queue_destroy_
       (controller->opq_parallel_topology_config_operations);
+  GNUNET_TESTBED_operation_queue_destroy_
+      (controller->opq_parallel_overlay_connect_operations);
   GNUNET_free (controller);
 }
 
@@ -1787,9 +1794,13 @@ GNUNET_TESTBED_register_host (struct GNUNET_TESTBED_Controller *controller,
   msg->header.type = htons (GNUNET_MESSAGE_TYPE_TESTBED_ADDHOST);
   msg->host_id = htonl (GNUNET_TESTBED_host_get_id_ (host));
   msg->ssh_port = htons (GNUNET_TESTBED_host_get_ssh_port_ (host));
-  msg->user_name_length = htons (user_name_length);
   if (NULL != username)
+  {
+    msg->user_name_length = htons (user_name_length - 1);
     memcpy (&msg[1], username, user_name_length);
+  }
+  else
+    msg->user_name_length = htons (user_name_length);
   strcpy (((void *) &msg[1]) + user_name_length, hostname);
   GNUNET_TESTBED_queue_message_ (controller,
                                  (struct GNUNET_MessageHeader *) msg);
@@ -1819,15 +1830,14 @@ GNUNET_TESTBED_cancel_registration (struct GNUNET_TESTBED_HostRegistrationHandle
 
 
 /**
- * Same as the GNUNET_TESTBED_controller_link, however expects configuration in
- * serialized and compressed
+ * Same as the GNUNET_TESTBED_controller_link_2, but with ids for delegated host
+ * and slave host
  *
  * @param op_cls the operation closure for the event which is generated to
  *          signal success or failure of this operation
  * @param master handle to the master controller who creates the association
- * @param delegated_host requests to which host should be delegated; cannot be NULL
- * @param slave_host which host is used to run the slave controller; use NULL to
- *          make the master controller connect to the delegated host
+ * @param delegated_host_id id of the host to which requests should be delegated
+ * @param slave_host_id id of the host which is used to run the slave controller
  * @param sxcfg serialized and compressed configuration
  * @param sxcfg_size the size sxcfg
  * @param scfg_size the size of uncompressed serialized configuration
@@ -1838,53 +1848,96 @@ GNUNET_TESTBED_cancel_registration (struct GNUNET_TESTBED_HostRegistrationHandle
  * @return the operation handle
  */
 struct GNUNET_TESTBED_Operation *
-GNUNET_TESTBED_controller_link_2 (void *op_cls,
-                                 struct GNUNET_TESTBED_Controller *master,
-                                  struct GNUNET_TESTBED_Host *delegated_host,
-                                  struct GNUNET_TESTBED_Host *slave_host,
-                                  const char *sxcfg, size_t sxcfg_size,
-                                  size_t scfg_size, int is_subordinate)
+GNUNET_TESTBED_controller_link_2_ (void *op_cls,
+                                   struct GNUNET_TESTBED_Controller *master,
+                                   uint32_t delegated_host_id,
+                                   uint32_t slave_host_id,
+                                   const char *sxcfg, size_t sxcfg_size,
+                                   size_t scfg_size, int is_subordinate)
 {
   struct OperationContext *opc;
   struct GNUNET_TESTBED_ControllerLinkMessage *msg;
   struct ControllerLinkData *data;
   uint16_t msg_size;
 
-  GNUNET_assert (GNUNET_YES ==
-                 GNUNET_TESTBED_is_host_registered_ (delegated_host, master));
-  if ((NULL != slave_host) && (0 != GNUNET_TESTBED_host_get_id_ (slave_host)))
-    GNUNET_assert (GNUNET_YES ==
-                   GNUNET_TESTBED_is_host_registered_ (slave_host, master));
   msg_size = sxcfg_size + sizeof (struct GNUNET_TESTBED_ControllerLinkMessage);
   msg = GNUNET_malloc (msg_size);
   msg->header.type = htons (GNUNET_MESSAGE_TYPE_TESTBED_LCONTROLLERS);
   msg->header.size = htons (msg_size);
-  msg->delegated_host_id = htonl (GNUNET_TESTBED_host_get_id_ (delegated_host));
-  msg->slave_host_id =
-      htonl (GNUNET_TESTBED_host_get_id_
-             ((NULL != slave_host) ? slave_host : master->host));
+  msg->delegated_host_id = htonl (delegated_host_id);
+  msg->slave_host_id = htonl (slave_host_id);
   msg->config_size = htons ((uint16_t) scfg_size);
   msg->is_subordinate = (GNUNET_YES == is_subordinate) ? 1 : 0;
   memcpy (&msg[1], sxcfg, sxcfg_size);
   data = GNUNET_malloc (sizeof (struct ControllerLinkData));
   data->msg = msg;
-  data->op_cls = op_cls;
   opc = GNUNET_malloc (sizeof (struct OperationContext));
   opc->c = master;
   opc->data = data;
   opc->type = OP_LINK_CONTROLLERS;
-  opc->id = master->operation_counter++;
+  opc->id = GNUNET_TESTBED_get_next_op_id (opc->c);
   opc->state = OPC_STATE_INIT;
+  opc->op_cls = op_cls;
   msg->operation_id = GNUNET_htonll (opc->id);
   opc->op =
       GNUNET_TESTBED_operation_create_ (opc, &opstart_link_controllers,
                                         &oprelease_link_controllers);
   GNUNET_TESTBED_operation_queue_insert_ (master->opq_parallel_operations,
                                           opc->op);
+  GNUNET_TESTBED_operation_begin_wait_ (opc->op);
   return opc->op;
 }
 
 
+/**
+ * Same as the GNUNET_TESTBED_controller_link, however expects configuration in
+ * serialized and compressed
+ *
+ * @param op_cls the operation closure for the event which is generated to
+ *          signal success or failure of this operation
+ * @param master handle to the master controller who creates the association
+ * @param delegated_host requests to which host should be delegated; cannot be NULL
+ * @param slave_host which host is used to run the slave controller; use NULL to
+ *          make the master controller connect to the delegated host
+ * @param sxcfg serialized and compressed configuration
+ * @param sxcfg_size the size sxcfg
+ * @param scfg_size the size of uncompressed serialized configuration
+ * @param is_subordinate GNUNET_YES if the controller at delegated_host should
+ *          be started by the slave controller; GNUNET_NO if the slave
+ *          controller has to connect to the already started delegated
+ *          controller via TCP/IP
+ * @return the operation handle
+ */
+struct GNUNET_TESTBED_Operation *
+GNUNET_TESTBED_controller_link_2 (void *op_cls,
+                                 struct GNUNET_TESTBED_Controller *master,
+                                  struct GNUNET_TESTBED_Host *delegated_host,
+                                  struct GNUNET_TESTBED_Host *slave_host,
+                                  const char *sxcfg, size_t sxcfg_size,
+                                  size_t scfg_size, int is_subordinate)
+{ 
+  uint32_t delegated_host_id;
+  uint32_t slave_host_id;
+
+  GNUNET_assert (GNUNET_YES ==
+                 GNUNET_TESTBED_is_host_registered_ (delegated_host, master));
+  delegated_host_id = GNUNET_TESTBED_host_get_id_ (delegated_host);
+  slave_host_id = 
+      GNUNET_TESTBED_host_get_id_ ((NULL != slave_host)
+                                   ? slave_host : master->host);
+  if ((NULL != slave_host) && (0 != GNUNET_TESTBED_host_get_id_ (slave_host)))
+    GNUNET_assert (GNUNET_YES ==
+                   GNUNET_TESTBED_is_host_registered_ (slave_host, master));
+  
+  return GNUNET_TESTBED_controller_link_2_ (op_cls,
+                                            master,
+                                            delegated_host_id,
+                                            slave_host_id,
+                                            sxcfg, sxcfg_size,
+                                            scfg_size, is_subordinate);
+}
+
+
 /**
  * Compresses given configuration using zlib compress
  *
@@ -1910,6 +1963,55 @@ GNUNET_TESTBED_compress_config_ (const char *config, size_t size,
 }
 
 
+/**
+ * Same as the GNUNET_TESTBED_controller_link, but with ids for delegated host
+ * and slave host
+ *
+ * @param op_cls the operation closure for the event which is generated to
+ *          signal success or failure of this operation
+ * @param master handle to the master controller who creates the association
+ * @param delegated_host_id id of the host to which requests should be
+ *          delegated; cannot be NULL
+ * @param slave_host_id id of the host which should connect to controller
+ *          running on delegated host ; use NULL to make the master controller
+ *          connect to the delegated host
+ * @param slave_cfg configuration to use for the slave controller
+ * @param is_subordinate GNUNET_YES if the controller at delegated_host should
+ *          be started by the slave controller; GNUNET_NO if the slave
+ *          controller has to connect to the already started delegated
+ *          controller via TCP/IP
+ * @return the operation handle
+ */
+struct GNUNET_TESTBED_Operation *
+GNUNET_TESTBED_controller_link_ (void *op_cls,
+                               struct GNUNET_TESTBED_Controller *master,
+                                uint32_t delegated_host_id,
+                                uint32_t slave_host_id,
+                                const struct GNUNET_CONFIGURATION_Handle
+                                *slave_cfg,
+                                int is_subordinate)
+{
+  struct GNUNET_TESTBED_Operation *op;
+  char *config;
+  char *cconfig;
+  size_t cc_size;
+  size_t config_size;
+
+  config = GNUNET_CONFIGURATION_serialize (slave_cfg, &config_size);
+  cc_size = GNUNET_TESTBED_compress_config_ (config, config_size, &cconfig);
+  GNUNET_free (config);
+  /* Configuration doesn't fit in 1 message */
+  GNUNET_assert ((UINT16_MAX - 
+                 sizeof (struct GNUNET_TESTBED_ControllerLinkMessage)) >=
+                 cc_size);
+  op = GNUNET_TESTBED_controller_link_2_ (op_cls, master, delegated_host_id,
+                                          slave_host_id, (const char *) cconfig,
+                                          cc_size, config_size, is_subordinate);
+  GNUNET_free (cconfig);
+  return op;
+}
+
+
 /**
  * Create a link from slave controller to delegated controller. Whenever the
  * master controller is asked to start a peer at the delegated controller the
@@ -1947,28 +2049,63 @@ GNUNET_TESTBED_controller_link (void *op_cls,
                                 const struct GNUNET_CONFIGURATION_Handle
                                 *slave_cfg, int is_subordinate)
 {
-  struct GNUNET_TESTBED_Operation *op;
-  char *config;
-  char *cconfig;
-  size_t cc_size;
-  size_t config_size;
+  uint32_t slave_host_id;
+  uint32_t delegated_host_id;
 
   GNUNET_assert (GNUNET_YES ==
                  GNUNET_TESTBED_is_host_registered_ (delegated_host, master));
-  if ((NULL != slave_host) && (0 != GNUNET_TESTBED_host_get_id_ (slave_host)))
+  slave_host_id = 
+      GNUNET_TESTBED_host_get_id_ ((NULL != slave_host)
+                                   ? slave_host : master->host);
+  delegated_host_id = GNUNET_TESTBED_host_get_id_ (delegated_host);
+  if ((NULL != slave_host) && (0 != slave_host_id))
     GNUNET_assert (GNUNET_YES ==
                    GNUNET_TESTBED_is_host_registered_ (slave_host, master));
-  config = GNUNET_CONFIGURATION_serialize (slave_cfg, &config_size);
-  cc_size = GNUNET_TESTBED_compress_config_ (config, config_size, &cconfig);
-  GNUNET_free (config);
-  /* Configuration doesn't fit in 1 message */
-  GNUNET_assert ((UINT16_MAX - 
-                 sizeof (struct GNUNET_TESTBED_ControllerLinkMessage)) >= cc_size);
-  op = GNUNET_TESTBED_controller_link_2 (op_cls, master, delegated_host,
-                                        slave_host, (const char *) cconfig,
-                                        cc_size, config_size, is_subordinate);
-  GNUNET_free (cconfig);
-  return op;
+  return GNUNET_TESTBED_controller_link_ (op_cls, master,
+                                          delegated_host_id,
+                                          slave_host_id,
+                                          slave_cfg,
+                                          is_subordinate);
+                                          
+}
+
+
+/**
+ * Like GNUNET_TESTBED_get_slave_config(), however without the host registration
+ * check. Another difference is that this function takes the id of the slave
+ * host.
+ *
+ * @param op_cls the closure for the operation
+ * @param master the handle to master controller
+ * @param slave_host_id id of the host where the slave controller is running to
+ *          the slave_host should remain valid until this operation is cancelled
+ *          or marked as finished
+ * @return the operation handle;
+ */
+struct GNUNET_TESTBED_Operation *
+GNUNET_TESTBED_get_slave_config_ (void *op_cls,
+                                  struct GNUNET_TESTBED_Controller *master,
+                                  uint32_t slave_host_id)
+{  
+  struct OperationContext *opc;
+  struct GetSlaveConfigData *data;
+
+  data = GNUNET_malloc (sizeof (struct GetSlaveConfigData));
+  data->slave_id = slave_host_id;
+  opc = GNUNET_malloc (sizeof (struct OperationContext));
+  opc->state = OPC_STATE_INIT;
+  opc->c = master;
+  opc->id = GNUNET_TESTBED_get_next_op_id (master);
+  opc->type = OP_GET_SLAVE_CONFIG;
+  opc->data = data;
+  opc->op_cls = op_cls;
+  opc->op =
+      GNUNET_TESTBED_operation_create_ (opc, &opstart_get_slave_config,
+                                        &oprelease_get_slave_config);
+  GNUNET_TESTBED_operation_queue_insert_ (master->opq_parallel_operations,
+                                         opc->op); 
+  GNUNET_TESTBED_operation_begin_wait_ (opc->op);
+  return opc->op;
 }
 
 
@@ -1992,26 +2129,10 @@ GNUNET_TESTBED_get_slave_config (void *op_cls,
                                  struct GNUNET_TESTBED_Controller *master,
                                  struct GNUNET_TESTBED_Host *slave_host)
 {
-  struct OperationContext *opc;
-  struct GetSlaveConfigData *data;
-
   if (GNUNET_NO == GNUNET_TESTBED_is_host_registered_ (slave_host, master))
     return NULL;
-  data = GNUNET_malloc (sizeof (struct GetSlaveConfigData));
-  data->slave_id = GNUNET_TESTBED_host_get_id_ (slave_host);
-  data->op_cls = op_cls;
-  opc = GNUNET_malloc (sizeof (struct OperationContext));
-  opc->state = OPC_STATE_INIT;
-  opc->c = master;
-  opc->id = master->operation_counter++;
-  opc->type = OP_GET_SLAVE_CONFIG;
-  opc->data = data;
-  opc->op =
-      GNUNET_TESTBED_operation_create_ (opc, &opstart_get_slave_config,
-                                        &oprelease_get_slave_config);
-  GNUNET_TESTBED_operation_queue_insert_ (master->opq_parallel_operations,
-                                         opc->op); 
-  return opc->op;
+  return GNUNET_TESTBED_get_slave_config_ (op_cls, master,
+                                           GNUNET_TESTBED_host_get_id_ (slave_host));
 }
 
 
@@ -2112,21 +2233,7 @@ GNUNET_TESTBED_operation_cancel (struct GNUNET_TESTBED_Operation *operation)
 void
 GNUNET_TESTBED_operation_done (struct GNUNET_TESTBED_Operation *operation)
 {
-  switch (operation->type)
-  {
-  case OP_PEER_CREATE:
-  case OP_PEER_DESTROY:
-  case OP_PEER_START:
-  case OP_PEER_STOP:
-  case OP_PEER_INFO:
-  case OP_OVERLAY_CONNECT:
-  case OP_LINK_CONTROLLERS:
     GNUNET_TESTBED_operation_release_ (operation);
-    return;
-  default:
-    GNUNET_assert (0);
-    break;
-  }
 }
 
 
@@ -2220,4 +2327,23 @@ GNUNET_TESTBED_parse_error_string_ (const struct
   return emsg;
 }
 
+
+/**
+ * Function to return the operation id for a controller. The operation id is
+ * created from the controllers host id and its internal operation counter.
+ *
+ * @param controller the handle to the controller whose operation id has to be incremented
+ * @return the incremented operation id.
+ */
+uint64_t
+GNUNET_TESTBED_get_next_op_id (struct GNUNET_TESTBED_Controller *controller)
+{
+  uint64_t op_id;  
+
+  op_id = (uint64_t) GNUNET_TESTBED_host_get_id_ (controller->host);
+  op_id = op_id <<  32;
+  op_id |= (uint64_t) controller->operation_counter++;
+  return op_id;
+}
+
 /* end of testbed_api.c */