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3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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22 * @file fs/gnunet-service-fs_pr.h
23 * @brief API to handle pending requests
24 * @author Christian Grothoff
26 #ifndef GNUNET_SERVICE_FS_PR_H
27 #define GNUNET_SERVICE_FS_PR_H
29 #include "gnunet-service-fs.h"
33 * Options for pending requests (bits to be ORed).
35 enum GSF_PendingRequestOptions
38 * Request must only be processed locally.
40 GSF_PRO_LOCAL_ONLY = 1,
43 * Request must only be forwarded (no routing)
45 GSF_PRO_FORWARD_ONLY = 2,
48 * Request persists indefinitely (no expiration).
50 GSF_PRO_REQUEST_EXPIRES = 4,
53 * Request is allowed to refresh bloomfilter and change mingle value.
55 GSF_PRO_BLOOMFILTER_FULL_REFRESH = 8,
58 * Request priority is allowed to be exceeded.
60 GSF_PRO_PRIORITY_UNLIMITED = 16,
63 * Option mask for typical local requests.
65 GSF_PRO_LOCAL_REQUEST = (GSF_PRO_BLOOMFILTER_FULL_REFRESH | GSF_PRO_PRIORITY_UNLIMITED)
71 * Public data (in the sense of not encapsulated within
72 * 'gnunet-service-fs_pr', not in the sense of network-wide
73 * known) associated with each pending request.
75 struct GSF_PendingRequestData
79 * Primary query hash for this request.
81 GNUNET_HashCode query;
84 * Namespace to query, only set if the type is SBLOCK.
86 GNUNET_HashCode namespace;
89 * Identity of a peer hosting the content, only set if
90 * 'has_target' is GNUNET_YES.
92 struct GNUNET_PeerIdentity target;
95 * Fields for the plan module to track a DLL with the request.
97 struct GSF_RequestPlan *rp_head;
100 * Fields for the plan module to track a DLL with the request.
102 struct GSF_RequestPlan *rp_tail;
105 * Current TTL for the request.
107 struct GNUNET_TIME_Absolute ttl;
110 * When did we start with the request.
112 struct GNUNET_TIME_Absolute start_time;
115 * Desired anonymity level.
117 uint32_t anonymity_level;
120 * Priority that this request (still) has for us.
125 * Priority that this request (originally) had for us.
127 uint32_t original_priority;
130 * Options for the request.
132 enum GSF_PendingRequestOptions options;
135 * Type of the requested block.
137 enum GNUNET_BLOCK_Type type;
140 * Number of results we have found for this request so far.
142 unsigned int results_found;
145 * Is the 'target' value set to a valid peer identity?
153 * Handle a reply to a pending request. Also called if a request
154 * expires (then with data == NULL). The handler may be called
155 * many times (depending on the request type), but will not be
156 * called during or after a call to GSF_pending_request_cancel
157 * and will also not be called anymore after a call signalling
160 * @param cls user-specified closure
161 * @param eval evaluation of the result
162 * @param pr handle to the original pending request
163 * @param expiration when does 'data' expire?
164 * @param type type of the block
165 * @param data response data, NULL on request expiration
166 * @param data_len number of bytes in data
168 typedef void (*GSF_PendingRequestReplyHandler)(void *cls,
169 enum GNUNET_BLOCK_EvaluationResult eval,
170 struct GSF_PendingRequest *pr,
171 struct GNUNET_TIME_Absolute expiration,
172 enum GNUNET_BLOCK_Type type,
178 * Create a new pending request.
180 * @param options request options
181 * @param type type of the block that is being requested
182 * @param query key for the lookup
183 * @param namespace namespace to lookup, NULL for no namespace
184 * @param target preferred target for the request, NULL for none
185 * @param bf_data raw data for bloom filter for known replies, can be NULL
186 * @param bf_size number of bytes in bf_data
187 * @param mingle mingle value for bf
188 * @param anonymity_level desired anonymity level
189 * @param priority maximum outgoing cummulative request priority to use
190 * @param ttl current time-to-live for the request
191 * @param sender_pid peer ID to use for the sender when forwarding, 0 for none;
192 * reference counter is taken over by this function
193 * @param replies_seen hash codes of known local replies
194 * @param replies_seen_count size of the 'replies_seen' array
195 * @param rh handle to call when we get a reply
196 * @param rh_cls closure for rh
197 * @return handle for the new pending request
199 struct GSF_PendingRequest *
200 GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
201 enum GNUNET_BLOCK_Type type,
202 const GNUNET_HashCode *query,
203 const GNUNET_HashCode *namespace,
204 const struct GNUNET_PeerIdentity *target,
208 uint32_t anonymity_level,
211 GNUNET_PEER_Id sender_pid,
212 const GNUNET_HashCode *replies_seen,
213 unsigned int replies_seen_count,
214 GSF_PendingRequestReplyHandler rh,
219 * Update a given pending request with additional replies
220 * that have been seen.
222 * @param pr request to update
223 * @param replies_seen hash codes of replies that we've seen
224 * @param replies_seen_count size of the replies_seen array
227 GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
228 const GNUNET_HashCode *replies_seen,
229 unsigned int replies_seen_count);
233 * Obtain the public data associated with a pending request
235 * @param pr pending request
236 * @return associated public data
238 struct GSF_PendingRequestData *
239 GSF_pending_request_get_data_ (struct GSF_PendingRequest *pr);
243 * Generate the message corresponding to the given pending request for
244 * transmission to other peers (or at least determine its size).
246 * @param pr request to generate the message for
247 * @param buf_size number of bytes available in buf
248 * @param buf where to copy the message (can be NULL)
249 * @return number of bytes needed (if buf_size too small) or used
252 GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
258 * Explicitly cancel a pending request.
260 * @param pr request to cancel
263 GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr);
267 * Signature of function called on each request.
268 * (Note: 'subtype' of GNUNET_CONTAINER_HashMapIterator).
271 * @param key query for the request
272 * @param pr handle to the pending request
273 * @return GNUNET_YES to continue to iterate
275 typedef int (*GSF_PendingRequestIterator)(void *cls,
276 const GNUNET_HashCode *key,
277 struct GSF_PendingRequest *pr);
281 * Iterate over all pending requests.
283 * @param it function to call for each request
284 * @param cls closure for it
287 GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it,
292 * Handle P2P "CONTENT" message. Checks that the message is
293 * well-formed and then checks if there are any pending requests for
294 * this content and possibly passes it on (to local clients or other
295 * peers). Does NOT perform migration (content caching at this peer).
297 * @param cp the other peer involved (sender or receiver, NULL
298 * for loopback messages where we are both sender and receiver)
299 * @param message the actual message
300 * @return GNUNET_OK if the message was well-formed,
301 * GNUNET_SYSERR if the message was malformed (close connection,
302 * do not cache under any circumstances)
305 GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
306 const struct GNUNET_MessageHeader *message);
310 * Consider looking up the data in the DHT (anonymity-level permitting).
312 * @param pr the pending request to process
315 GSF_dht_lookup_ (struct GSF_PendingRequest *pr);
319 * Function to be called after we're done processing
320 * replies from the local lookup.
323 * @param pr the pending request we were processing
324 * @param result final datastore lookup result
326 typedef void (*GSF_LocalLookupContinuation)(void *cls,
327 struct GSF_PendingRequest *pr,
328 enum GNUNET_BLOCK_EvaluationResult result);
332 * Look up the request in the local datastore.
334 * @param pr the pending request to process
335 * @param cont function to call at the end
336 * @param cont_cls closure for cont
339 GSF_local_lookup_ (struct GSF_PendingRequest *pr,
340 GSF_LocalLookupContinuation cont,
345 * Setup the subsystem.
348 GSF_pending_request_init_ (void);
352 * Shutdown the subsystem.
355 GSF_pending_request_done_ (void);
359 /* end of gnunet-service-fs_pr.h */