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3 Copyright (C) 2009, 2010, 2011, 2016 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * @brief api to get information from the network size estimation service
22 * @author Nathan Evans
25 #include "gnunet_constants.h"
26 #include "gnunet_arm_service.h"
27 #include "gnunet_hello_lib.h"
28 #include "gnunet_protocols.h"
29 #include "gnunet_util_lib.h"
30 #include "gnunet_nse_service.h"
33 #define LOG(kind,...) GNUNET_log_from (kind, "nse-api",__VA_ARGS__)
36 * Handle for talking with the NSE service.
38 struct GNUNET_NSE_Handle
41 * Configuration to use.
43 const struct GNUNET_CONFIGURATION_Handle *cfg;
46 * Message queue (if available).
48 struct GNUNET_MQ_Handle *mq;
51 * Task doing exponential back-off trying to reconnect.
53 struct GNUNET_SCHEDULER_Task *reconnect_task;
56 * Time for next connect retry.
58 struct GNUNET_TIME_Relative reconnect_delay;
61 * Callback function to call when message is received.
63 GNUNET_NSE_Callback recv_cb;
66 * Closure to pass to @e recv_cb callback.
74 * Try again to connect to network size estimation service.
76 * @param cls closure with the `struct GNUNET_NSE_Handle *`
79 reconnect (void *cls);
83 * Generic error handler, called with the appropriate
84 * error code and the same closure specified at the creation of
86 * Not every message queue implementation supports an error handler.
88 * @param cls closure with the `struct GNUNET_NSE_Handle *`
89 * @param error error code
92 mq_error_handler (void *cls,
93 enum GNUNET_MQ_Error error)
95 struct GNUNET_NSE_Handle *h = cls;
97 GNUNET_MQ_destroy (h->mq);
100 = GNUNET_SCHEDULER_add_delayed (h->reconnect_delay,
103 h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
108 * Type of a function to call when we receive a message
112 * @param client_msg message received
115 handle_estimate (void *cls,
116 const struct GNUNET_NSE_ClientMessage *client_msg)
118 struct GNUNET_NSE_Handle *h = cls;
120 h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
121 h->recv_cb (h->recv_cb_cls,
122 GNUNET_TIME_absolute_ntoh (client_msg->timestamp),
123 GNUNET_ntoh_double (client_msg->size_estimate),
124 GNUNET_ntoh_double (client_msg->std_deviation));
129 * Try again to connect to network size estimation service.
131 * @param cls the `struct GNUNET_NSE_Handle *`
134 reconnect (void *cls)
136 struct GNUNET_NSE_Handle *h = cls;
137 struct GNUNET_MQ_MessageHandler handlers[] = {
138 GNUNET_MQ_hd_fixed_size (estimate,
139 GNUNET_MESSAGE_TYPE_NSE_ESTIMATE,
140 struct GNUNET_NSE_ClientMessage,
142 GNUNET_MQ_handler_end ()
144 struct GNUNET_MessageHeader *msg;
145 struct GNUNET_MQ_Envelope *env;
147 h->reconnect_task = NULL;
148 LOG (GNUNET_ERROR_TYPE_DEBUG,
149 "Connecting to network size estimation service.\n");
150 GNUNET_assert (NULL == h->mq);
151 h->mq = GNUNET_CLIENT_connect (h->cfg,
158 env = GNUNET_MQ_msg (msg,
159 GNUNET_MESSAGE_TYPE_NSE_START);
160 GNUNET_MQ_send (h->mq,
166 * Connect to the network size estimation service.
168 * @param cfg the configuration to use
169 * @param func funtion to call with network size estimate
170 * @param func_cls closure to pass to @a func
171 * @return handle to use
173 struct GNUNET_NSE_Handle *
174 GNUNET_NSE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
175 GNUNET_NSE_Callback func,
178 struct GNUNET_NSE_Handle *h;
180 GNUNET_assert (NULL != func);
181 h = GNUNET_new (struct GNUNET_NSE_Handle);
184 h->recv_cb_cls = func_cls;
185 h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
197 * Disconnect from network size estimation service
199 * @param h handle to destroy
202 GNUNET_NSE_disconnect (struct GNUNET_NSE_Handle *h)
204 if (NULL != h->reconnect_task)
206 GNUNET_SCHEDULER_cancel (h->reconnect_task);
207 h->reconnect_task = NULL;
211 GNUNET_MQ_destroy (h->mq);
217 /* end of nse_api.c */