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-rw-r--r--src/nse/nse_api.c209
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diff --git a/src/nse/nse_api.c b/src/nse/nse_api.c
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index 23daa7f12..000000000
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009, 2010, 2011, 2016 GNUnet e.V.
4
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,
8 or (at your option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
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.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file nse/nse_api.c
23 * @brief api to get information from the network size estimation service
24 * @author Nathan Evans
25 */
26#include "platform.h"
27#include "gnunet_constants.h"
28#include "gnunet_arm_service.h"
29#include "gnunet_hello_lib.h"
30#include "gnunet_protocols.h"
31#include "gnunet_util_lib.h"
32#include "gnunet_nse_service.h"
33#include "nse.h"
34
35#define LOG(kind, ...) GNUNET_log_from (kind, "nse-api", __VA_ARGS__)
36
37/**
38 * Handle for talking with the NSE service.
39 */
40struct GNUNET_NSE_Handle
41{
42 /**
43 * Configuration to use.
44 */
45 const struct GNUNET_CONFIGURATION_Handle *cfg;
46
47 /**
48 * Message queue (if available).
49 */
50 struct GNUNET_MQ_Handle *mq;
51
52 /**
53 * Task doing exponential back-off trying to reconnect.
54 */
55 struct GNUNET_SCHEDULER_Task *reconnect_task;
56
57 /**
58 * Time for next connect retry.
59 */
60 struct GNUNET_TIME_Relative reconnect_delay;
61
62 /**
63 * Callback function to call when message is received.
64 */
65 GNUNET_NSE_Callback recv_cb;
66
67 /**
68 * Closure to pass to @e recv_cb callback.
69 */
70 void *recv_cb_cls;
71};
72
73
74/**
75 * Try again to connect to network size estimation service.
76 *
77 * @param cls closure with the `struct GNUNET_NSE_Handle *`
78 */
79static void
80reconnect (void *cls);
81
82
83/**
84 * Generic error handler, called with the appropriate
85 * error code and the same closure specified at the creation of
86 * the message queue.
87 * Not every message queue implementation supports an error handler.
88 *
89 * @param cls closure with the `struct GNUNET_NSE_Handle *`
90 * @param error error code
91 */
92static void
93mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
94{
95 struct GNUNET_NSE_Handle *h = cls;
96
97 (void) error;
98 GNUNET_MQ_destroy (h->mq);
99 h->mq = NULL;
100 h->reconnect_task =
101 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
102 h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
103}
104
105
106/**
107 * Type of a function to call when we receive a message
108 * from the service.
109 *
110 * @param cls closure
111 * @param client_msg message received
112 */
113static void
114handle_estimate (void *cls, const struct GNUNET_NSE_ClientMessage *client_msg)
115{
116 struct GNUNET_NSE_Handle *h = cls;
117
118 h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
119 h->recv_cb (h->recv_cb_cls,
120 GNUNET_TIME_absolute_ntoh (client_msg->timestamp),
121 GNUNET_ntoh_double (client_msg->size_estimate),
122 GNUNET_ntoh_double (client_msg->std_deviation));
123}
124
125
126/**
127 * Try again to connect to network size estimation service.
128 *
129 * @param cls the `struct GNUNET_NSE_Handle *`
130 */
131static void
132reconnect (void *cls)
133{
134 struct GNUNET_NSE_Handle *h = cls;
135 struct GNUNET_MQ_MessageHandler handlers[] =
136 { GNUNET_MQ_hd_fixed_size (estimate,
137 GNUNET_MESSAGE_TYPE_NSE_ESTIMATE,
138 struct GNUNET_NSE_ClientMessage,
139 h),
140 GNUNET_MQ_handler_end () };
141 struct GNUNET_MessageHeader *msg;
142 struct GNUNET_MQ_Envelope *env;
143
144 h->reconnect_task = NULL;
145 LOG (GNUNET_ERROR_TYPE_DEBUG,
146 "Connecting to network size estimation service.\n");
147 GNUNET_assert (NULL == h->mq);
148 h->mq = GNUNET_CLIENT_connect (h->cfg, "nse", handlers, &mq_error_handler, h);
149 if (NULL == h->mq)
150 return;
151 env = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_NSE_START);
152 GNUNET_MQ_send (h->mq, env);
153}
154
155
156/**
157 * Connect to the network size estimation service.
158 *
159 * @param cfg the configuration to use
160 * @param func function to call with network size estimate
161 * @param func_cls closure to pass to @a func
162 * @return handle to use
163 */
164struct GNUNET_NSE_Handle *
165GNUNET_NSE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
166 GNUNET_NSE_Callback func,
167 void *func_cls)
168{
169 struct GNUNET_NSE_Handle *h;
170
171 GNUNET_assert (NULL != func);
172 h = GNUNET_new (struct GNUNET_NSE_Handle);
173 h->cfg = cfg;
174 h->recv_cb = func;
175 h->recv_cb_cls = func_cls;
176 h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
177 reconnect (h);
178 if (NULL == h->mq)
179 {
180 GNUNET_free (h);
181 return NULL;
182 }
183 return h;
184}
185
186
187/**
188 * Disconnect from network size estimation service
189 *
190 * @param h handle to destroy
191 */
192void
193GNUNET_NSE_disconnect (struct GNUNET_NSE_Handle *h)
194{
195 if (NULL != h->reconnect_task)
196 {
197 GNUNET_SCHEDULER_cancel (h->reconnect_task);
198 h->reconnect_task = NULL;
199 }
200 if (NULL != h->mq)
201 {
202 GNUNET_MQ_destroy (h->mq);
203 h->mq = NULL;
204 }
205 GNUNET_free (h);
206}
207
208
209/* end of nse_api.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-25 17:11:36 +0000