Exponential backoff for find finger trail task
[oweals/gnunet.git] / src / ats / gnunet-service-ats.c
1 /*
2      This file is part of GNUnet.
3      (C) 2011 Christian Grothoff (and other contributing authors)
4
5      GNUnet is free software; you can redistribute it and/or modify
6      it under the terms of the GNU General Public License as published
7      by the Free Software Foundation; either version 3, or (at your
8      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      General Public License for more details.
14
15      You should have received a copy of the GNU General Public License
16      along with GNUnet; see the file COPYING.  If not, write to the
17      Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18      Boston, MA 02111-1307, USA.
19 */
20
21 /**
22  * @file ats/gnunet-service-ats.c
23  * @brief ats service
24  * @author Matthias Wachs
25  * @author Christian Grothoff
26  */
27 #include "platform.h"
28 #include "gnunet_util_lib.h"
29 #include "gnunet-service-ats.h"
30 #include "gnunet-service-ats_addresses.h"
31 #include "gnunet-service-ats_performance.h"
32 #include "gnunet-service-ats_scheduling.h"
33 #include "gnunet-service-ats_reservations.h"
34 #include "ats.h"
35
36 /**
37  * Handle for statistics.
38  */
39 struct GNUNET_STATISTICS_Handle *GSA_stats;
40
41 /**
42  * Handle to the ATS server.
43  */
44 static struct GNUNET_SERVER_Handle *GSA_server;
45
46 /**
47  * Handle to the address state.
48  */
49 static struct GAS_Addresses_Handle *GSA_addresses;
50
51
52 /**
53  * We have received a `struct ClientStartMessage` from a client.  Find out which
54  * type of client it is and notify the respective subsystem.
55  *
56  * @param cls closure, unused
57  * @param client handle to the client
58  * @param message the start message
59  */
60 static void
61 handle_ats_start (void *cls, struct GNUNET_SERVER_Client *client,
62                   const struct GNUNET_MessageHeader *message)
63 {
64   const struct ClientStartMessage *msg =
65       (const struct ClientStartMessage *) message;
66   enum StartFlag flag;
67
68   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
69               "Received `%s' message\n",
70               "ATS_START");
71   flag = ntohl (msg->start_flag);
72   switch (flag)
73   {
74   case START_FLAG_SCHEDULING:
75     if (GNUNET_OK != GAS_scheduling_add_client (client))
76     {
77       GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
78       return;
79     }
80     break;
81   case START_FLAG_PERFORMANCE_WITH_PIC:
82     GAS_performance_add_client (client, flag);
83     break;
84   case START_FLAG_PERFORMANCE_NO_PIC:
85     GAS_performance_add_client (client, flag);
86     break;
87   default:
88     GNUNET_break (0);
89     GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
90     return;
91   }
92   GNUNET_SERVER_receive_done (client, GNUNET_OK);
93 }
94
95
96 /**
97  * A client disconnected from us.  Tear down the local client
98  * record.
99  *
100  * @param cls unused
101  * @param client handle of the client
102  */
103 static void
104 client_disconnect_handler (void *cls,
105                            struct GNUNET_SERVER_Client *client)
106 {
107   if (NULL == client)
108     return;
109   GAS_scheduling_remove_client (client);
110   GAS_performance_remove_client (client);
111 }
112
113
114 /**
115  * Task run during shutdown.
116  *
117  * @param cls unused
118  * @param tc unused
119  */
120 static void
121 cleanup_task (void *cls,
122               const struct GNUNET_SCHEDULER_TaskContext *tc)
123 {
124   GAS_addresses_done (GSA_addresses);
125   GAS_scheduling_done ();
126   GAS_performance_done ();
127   GAS_reservations_done ();
128   GNUNET_SERVER_disconnect_notify_cancel (GSA_server,
129                                           &client_disconnect_handler,
130                                           NULL);
131   if (NULL != GSA_stats)
132   {
133     GNUNET_STATISTICS_destroy (GSA_stats, GNUNET_NO);
134     GSA_stats = NULL;
135   }
136 }
137
138
139 /**
140  * Process template requests.
141  *
142  * @param cls closure
143  * @param server the initialized server
144  * @param cfg configuration to use
145  */
146 static void
147 run (void *cls, struct GNUNET_SERVER_Handle *server,
148      const struct GNUNET_CONFIGURATION_Handle *cfg)
149 {
150   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
151     {&handle_ats_start, NULL,
152      GNUNET_MESSAGE_TYPE_ATS_START, sizeof (struct ClientStartMessage)},
153     {&GAS_handle_request_address, NULL,
154      GNUNET_MESSAGE_TYPE_ATS_REQUEST_ADDRESS,
155      sizeof (struct RequestAddressMessage)},
156     {&GAS_handle_request_address_cancel, NULL,
157      GNUNET_MESSAGE_TYPE_ATS_REQUEST_ADDRESS_CANCEL,
158      sizeof (struct RequestAddressMessage)},
159     {&GAS_handle_request_address_list, NULL,
160      GNUNET_MESSAGE_TYPE_ATS_ADDRESSLIST_REQUEST,
161      sizeof (struct AddressListRequestMessage)},
162     {&GAS_handle_address_add, NULL,
163      GNUNET_MESSAGE_TYPE_ATS_ADDRESS_ADD, 0},
164     {&GAS_handle_address_update, NULL,
165      GNUNET_MESSAGE_TYPE_ATS_ADDRESS_UPDATE, 0},
166     {&GAS_handle_address_in_use, NULL,
167      GNUNET_MESSAGE_TYPE_ATS_ADDRESS_IN_USE, 0},
168     {&GAS_handle_address_destroyed, NULL,
169      GNUNET_MESSAGE_TYPE_ATS_ADDRESS_DESTROYED, 0},
170     {&GAS_handle_reservation_request, NULL,
171      GNUNET_MESSAGE_TYPE_ATS_RESERVATION_REQUEST,
172      sizeof (struct ReservationRequestMessage)},
173     {&GAS_handle_preference_change, NULL,
174      GNUNET_MESSAGE_TYPE_ATS_PREFERENCE_CHANGE, 0},
175     {&GAS_handle_preference_feedback, NULL,
176      GNUNET_MESSAGE_TYPE_ATS_PREFERENCE_FEEDBACK, 0},
177     {&GAS_handle_reset_backoff, NULL,
178      GNUNET_MESSAGE_TYPE_ATS_RESET_BACKOFF,
179      sizeof (struct ResetBackoffMessage)},
180     {NULL, NULL, 0, 0}
181   };
182   GSA_server = server;
183   GSA_stats = GNUNET_STATISTICS_create ("ats", cfg);
184   GAS_reservations_init ();
185   GSA_addresses = GAS_addresses_init (cfg, GSA_stats);
186   GAS_performance_init (server, GSA_addresses);
187   GAS_scheduling_init (server, GSA_addresses);
188
189   GNUNET_SERVER_disconnect_notify (server, &client_disconnect_handler, NULL);
190   GNUNET_SERVER_add_handlers (server, handlers);
191   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup_task,
192                                 NULL);
193 }
194
195
196 /**
197  * The main function for the ats service.
198  *
199  * @param argc number of arguments from the command line
200  * @param argv command line arguments
201  * @return 0 ok, 1 on error
202  */
203 int
204 main (int argc, char *const *argv)
205 {
206   return (GNUNET_OK ==
207           GNUNET_SERVICE_run (argc, argv, "ats",
208                               GNUNET_SERVICE_OPTION_NONE,
209                               &run, NULL)) ? 0 : 1;
210 }
211
212 /* end of gnunet-service-ats.c */