2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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22 * @file fs/gnunet-service-fs.h
23 * @brief shared data structures of gnunet-service-fs.c
24 * @author Christian Grothoff
26 #ifndef GNUNET_SERVICE_FS_H
27 #define GNUNET_SERVICE_FS_H
29 #include "gnunet_util_lib.h"
30 #include "gnunet_statistics_service.h"
31 #include "gnunet_transport_service.h"
32 #include "gnunet_core_service.h"
33 #include "gnunet_block_lib.h"
38 * By which amount do we decrement the TTL for simple forwarding /
39 * indirection of the query; in milli-seconds. Set somewhat in
40 * accordance to your network latency (above the time it'll take you
41 * to send a packet and get a reply).
43 #define TTL_DECREMENT 5000
46 * At what frequency should our datastore load decrease
47 * automatically (since if we don't use it, clearly the
48 * load must be going down).
50 #define DATASTORE_LOAD_AUTODECLINE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 250)
53 * Only the (mandatory) query is included.
55 #define GET_MESSAGE_BIT_QUERY_ONLY 0
58 * The peer identity of a peer waiting for the
59 * reply is included (used if the response
60 * should be transmitted to someone other than
61 * the sender of the GET).
63 #define GET_MESSAGE_BIT_RETURN_TO 1
66 * The peer identity of a peer that had claimed to have the content
67 * previously is included (can be used if responder-anonymity is not
68 * desired; note that the precursor presumably lacked a direct
69 * connection to the specified peer; still, the receiver is in no way
70 * required to limit forwarding only to the specified peer, it should
71 * only prefer it somewhat if possible).
73 #define GET_MESSAGE_BIT_TRANSMIT_TO 4
76 GNUNET_NETWORK_STRUCT_BEGIN
79 * Message sent between peers asking for FS-content.
85 * Message type will be GNUNET_MESSAGE_TYPE_FS_GET.
87 struct GNUNET_MessageHeader header;
90 * Type of the query (block type).
92 uint32_t type GNUNET_PACKED;
95 * How important is this request (network byte order)
97 uint32_t priority GNUNET_PACKED;
100 * Relative time to live in MILLISECONDS (network byte order)
102 int32_t ttl GNUNET_PACKED;
105 * The content hash should be mutated using this value
106 * before checking against the bloomfilter (used to
107 * get many different filters for the same hash codes).
108 * The number should be in big-endian format when used
111 uint32_t filter_mutator GNUNET_PACKED;
114 * Which of the optional hash codes are present at the end of the
115 * message? See GET_MESSAGE_BIT_xx constants. For each bit that is
116 * set, an additional struct GNUNET_HashCode with the respective content
117 * (in order of the bits) will be appended to the end of the GET
120 uint32_t hash_bitmap GNUNET_PACKED;
123 * Hashcodes of the file(s) we're looking for.
124 * Details depend on the query type.
126 struct GNUNET_HashCode query;
128 /* this is followed by hash codes as specified in the "hash_bitmap";
129 * after that, an optional bloomfilter (with bits set for replies
130 * that should be suppressed) can be present */
135 * Message send by a peer that wants to be excluded
136 * from migration for a while.
138 struct MigrationStopMessage
141 * Message type will be
142 * GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP.
144 struct GNUNET_MessageHeader header;
149 uint32_t reserved GNUNET_PACKED;
152 * How long should the block last?
154 struct GNUNET_TIME_RelativeNBO duration;
157 GNUNET_NETWORK_STRUCT_END
162 struct GSF_ConnectedPeer;
167 struct GSF_PendingRequest;
172 struct GSF_LocalClient;
175 * Information kept per plan per request ('pe' module).
177 struct GSF_RequestPlan;
180 * Bijection between request plans and pending requests.
182 struct GSF_PendingRequestPlanBijection;
185 * Our connection to the datastore.
187 extern struct GNUNET_DATASTORE_Handle *GSF_dsh;
192 extern const struct GNUNET_CONFIGURATION_Handle *GSF_cfg;
195 * Handle for reporting statistics.
197 extern struct GNUNET_STATISTICS_Handle *GSF_stats;
200 * Pointer to handle to the core service (points to NULL until we've
203 extern struct GNUNET_CORE_Handle *GSF_core;
206 * Handle for DHT operations.
208 extern struct GNUNET_DHT_Handle *GSF_dht;
211 * How long do requests typically stay in the routing table?
213 extern struct GNUNET_LOAD_Value *GSF_rt_entry_lifetime;
216 * Running average of the observed latency to other peers (round trip).
218 extern struct GNUNET_TIME_Relative GSF_avg_latency;
221 * Typical priorities we're seeing from other peers right now. Since
222 * most priorities will be zero, this value is the weighted average of
223 * non-zero priorities seen "recently". In order to ensure that new
224 * values do not dramatically change the ratio, values are first
225 * "capped" to a reasonable range (+N of the current value) and then
226 * averaged into the existing value by a ratio of 1:N. Hence
227 * receiving the largest possible priority can still only raise our
228 * "current_priorities" by at most 1.
230 extern double GSF_current_priorities;
233 * How many query messages have we received 'recently' that
234 * have not yet been claimed as cover traffic?
236 extern unsigned int GSF_cover_query_count;
239 * How many content messages have we received 'recently' that
240 * have not yet been claimed as cover traffic?
242 extern unsigned int GSF_cover_content_count;
247 extern struct GNUNET_BLOCK_Context *GSF_block_ctx;
250 * Are we introducing randomized delays for better anonymity?
252 extern int GSF_enable_randomized_delays;
255 * Size of the datastore queue we assume for common requests.
257 extern unsigned int GSF_datastore_queue_size;
261 * Test if the DATABASE (GET) load on this peer is too high
262 * to even consider processing the query at
265 * @return GNUNET_YES if the load is too high to do anything (load high)
266 * GNUNET_NO to process normally (load normal)
267 * GNUNET_SYSERR to process for free (load low)
270 GSF_test_get_load_too_high_ (uint32_t priority);
274 * We've just now completed a datastore request. Update our
275 * datastore load calculations.
277 * @param start time when the datastore request was issued
280 GSF_update_datastore_delay_ (struct GNUNET_TIME_Absolute start);
285 /* end of gnunet-service-fs.h */