2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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22 * @file fs/gnunet-service-fs_cp.h
23 * @brief API to handle 'connected peers'
24 * @author Christian Grothoff
26 #ifndef GNUNET_SERVICE_FS_CP_H
27 #define GNUNET_SERVICE_FS_CP_H
30 #include "gnunet-service-fs.h"
34 * Maximum number of outgoing messages we queue per peer.
36 * Performance measurements for 2 peer setup for 50 MB file
37 * (with MAX_DATASTORE_QUEUE = 1 and RETRY_PROBABILITY_INV = 1):
39 * 2: 1700 kb/s, 1372 kb/s
40 * 8: 2117 kb/s, 1284 kb/s, 1112 kb/s
41 * 16: 3500 kb/s, 3200 kb/s, 3388 kb/s
42 * 32: 3441 kb/s, 3163 kb/s, 3277 kb/s
43 * 128: 1700 kb/s; 2010 kb/s, 3383 kb/s, 1156 kb/s
45 * Conclusion: 16 seems to be a pretty good value (stable
46 * and high performance, no excessive memory use).
48 #define MAX_QUEUE_PER_PEER 16
51 * Length of the P2P success tracker. Note that having a very long
52 * list can also hurt performance.
54 #define P2P_SUCCESS_LIST_SIZE 8
57 * Length of the CS-2-P success tracker. Note that
58 * having a very long list can also hurt performance.
60 #define CS2P_SUCCESS_LIST_SIZE 8
64 * Performance data kept for a peer.
66 struct GSF_PeerPerformanceData
70 * Transport performance data.
72 struct GNUNET_ATS_Information *atsi;
75 * List of the last clients for which this peer successfully
78 struct GSF_LocalClient *last_client_replies[CS2P_SUCCESS_LIST_SIZE];
81 * List of the last PIDs for which
82 * this peer successfully answered a query;
83 * We use 0 to indicate no successful reply.
85 GNUNET_PEER_Id last_p2p_replies[P2P_SUCCESS_LIST_SIZE];
88 * Average delay between sending the peer a request and
89 * getting a reply (only calculated over the requests for
90 * which we actually got a reply). Calculated
91 * as a moving average: new_delay = ((n-1)*last_delay+curr_delay) / n
93 struct GNUNET_TIME_Relative avg_reply_delay;
96 * If we get content we already have from this peer, for how
97 * long do we block him? Adjusted based on the fraction of
98 * redundant data we receive, between 1s and 1h.
100 struct GNUNET_TIME_Relative migration_delay;
103 * Point in time until which this peer does not want us to migrate content
106 struct GNUNET_TIME_Absolute migration_blocked_until;
109 * Transmission times for the last MAX_QUEUE_PER_PEER
110 * requests for this peer. Used as a ring buffer, current
111 * offset is stored in 'last_request_times_off'. If the
112 * oldest entry is more recent than the 'avg_delay', we should
113 * not send any more requests right now.
115 struct GNUNET_TIME_Absolute last_request_times[MAX_QUEUE_PER_PEER];
118 * How long does it typically take for us to transmit a message
119 * to this peer? (delay between the request being issued and
120 * the callback being invoked).
122 struct GNUNET_LOAD_Value *transmission_delay;
125 * Average priority of successful replies. Calculated
126 * as a moving average: new_avg = ((n-1)*last_avg+curr_prio) / n
131 * The peer's identity.
136 * Respect rating for this peer
141 * Number of pending queries (replies are not counted)
143 unsigned int pending_queries;
146 * Number of pending replies (queries are not counted)
148 unsigned int pending_replies;
154 * Signature of function called on a connected peer.
157 * @param peer identity of the peer
158 * @param cp handle to the connected peer record
159 * @param perf peer performance data
162 (*GSF_ConnectedPeerIterator) (void *cls,
163 const struct GNUNET_PeerIdentity *peer,
164 struct GSF_ConnectedPeer *cp,
165 const struct GSF_PeerPerformanceData *ppd);
169 * Function called to get a message for transmission.
172 * @param buf_size number of bytes available in @a buf
173 * @param buf where to copy the message, NULL on error (peer disconnect)
174 * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
177 (*GSF_GetMessageCallback) (void *cls,
183 * Signature of function called on a reservation success or failure.
186 * @param cp handle to the connected peer record
187 * @param success #GNUNET_YES on success, #GNUNET_NO on failure
190 (*GSF_PeerReserveCallback) (void *cls,
191 struct GSF_ConnectedPeer *cp,
196 * Function called after the creation of a connected peer record is complete.
199 * @param cp handle to the newly created connected peer record
202 (*GSF_ConnectedPeerCreationCallback) (void *cls,
203 struct GSF_ConnectedPeer *cp);
207 * Handle to cancel a transmission request.
209 struct GSF_PeerTransmitHandle;
213 * A peer connected to us. Setup the connected peer
216 * @param peer identity of peer that connected
217 * @param creation_cb callback function when the record is created.
218 * @param creation_cb_cls closure for @creation_cb
221 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
222 GSF_ConnectedPeerCreationCallback creation_cb,
223 void *creation_cb_cls);
227 * Get a handle for a connected peer.
229 * @param peer peer's identity
230 * @return NULL if this peer is not currently connected
232 struct GSF_ConnectedPeer *
233 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer);
237 * Update the latency information kept for the given peer.
239 * @param id peer record to update
240 * @param latency current latency value
243 GSF_update_peer_latency_ (const struct GNUNET_PeerIdentity *id,
244 struct GNUNET_TIME_Relative latency);
248 * Transmit a message to the given peer as soon as possible.
249 * If the peer disconnects before the transmission can happen,
250 * the callback is invoked with a 'NULL' buffer.
252 * @param cp target peer
253 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO)
254 * @param priority how important is this request?
255 * @param timeout when does this request timeout (call gmc with error)
256 * @param size number of bytes we would like to send to the peer
257 * @param gmc function to call to get the message
258 * @param gmc_cls closure for gmc
259 * @return handle to cancel request
261 struct GSF_PeerTransmitHandle *
262 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
265 struct GNUNET_TIME_Relative timeout,
266 size_t size, GSF_GetMessageCallback gmc,
271 * Cancel an earlier request for transmission.
273 * @param pth request to cancel
276 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth);
280 * Report on receiving a reply; update the performance record of the given peer.
282 * @param cp responding peer (will be updated)
283 * @param request_time time at which the original query was transmitted
284 * @param request_priority priority of the original request
287 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
288 struct GNUNET_TIME_Absolute request_time,
289 uint32_t request_priority);
293 * Report on receiving a reply in response to an initiating client.
294 * Remember that this peer is good for this client.
296 * @param cp responding peer (will be updated)
297 * @param initiator_client local client on responsible for query
300 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
301 struct GSF_LocalClient *initiator_client);
305 * Report on receiving a reply in response to an initiating peer.
306 * Remember that this peer is good for this initiating peer.
308 * @param cp responding peer (will be updated)
309 * @param initiator_peer other peer responsible for query
312 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
313 const struct GSF_ConnectedPeer
318 * Handle P2P "MIGRATION_STOP" message.
320 * @param cls closure, always NULL
321 * @param other the other peer involved (sender or receiver, NULL
322 * for loopback messages where we are both sender and receiver)
323 * @param message the actual message
324 * @return #GNUNET_OK to keep the connection open,
325 * #GNUNET_SYSERR to close it (signal serious error)
328 GSF_handle_p2p_migration_stop_ (void *cls,
329 const struct GNUNET_PeerIdentity *other,
330 const struct GNUNET_MessageHeader *message);
334 * Handle P2P "QUERY" message. Only responsible for creating the
335 * request entry itself and setting up reply callback and cancellation
336 * on peer disconnect. Does NOT execute the actual request strategy
337 * (planning) or local database operations.
339 * @param other the other peer involved (sender or receiver, NULL
340 * for loopback messages where we are both sender and receiver)
341 * @param message the actual message
342 * @return pending request handle, NULL on error
344 struct GSF_PendingRequest *
345 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
346 const struct GNUNET_MessageHeader *message);
350 * Return the performance data record for the given peer
352 * @param cp peer to query
353 * @return performance data record for the peer
355 struct GSF_PeerPerformanceData *
356 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp);
360 * Ask a peer to stop migrating data to us until the given point
363 * @param cp peer to ask
364 * @param block_time until when to block
367 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
368 struct GNUNET_TIME_Absolute block_time);
372 * A peer disconnected from us. Tear down the connected peer
376 * @param peer identity of peer that connected
379 GSF_peer_disconnect_handler_ (void *cls,
380 const struct GNUNET_PeerIdentity *peer);
384 * Notification that a local client disconnected. Clean up all of our
385 * references to the given handle.
387 * @param lc handle to the local client (henceforth invalid)
390 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc);
394 * Notify core about a preference we have for the given peer
395 * (to allocate more resources towards it). The change will
396 * be communicated the next time we reserve bandwidth with
397 * core (not instantly).
399 * @param cp peer to reserve bandwidth from
400 * @param pref preference change
403 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
408 * Obtain the identity of a connected peer.
410 * @param cp peer to get identity of
411 * @param id identity to set (written to)
414 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
415 struct GNUNET_PeerIdentity *id);
419 * Obtain the identity of a connected peer.
421 * @param cp peer to get identity of
422 * @return reference to peer identity, valid until peer disconnects (!)
424 const struct GNUNET_PeerIdentity *
425 GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp);
430 * Iterate over all connected peers.
432 * @param it function to call for each peer
433 * @param it_cls closure for it
436 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls);
440 * Initialize peer management subsystem.
443 GSF_connected_peer_init_ (void);
447 * Shutdown peer management subsystem.
450 GSF_connected_peer_done_ (void);
454 /* end of gnunet-service-fs_cp.h */