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22 * @file rps/gnunet-service-rps_peers.h
23 * @brief utilities for managing (information about) peers
24 * @author Julius Bünger
26 #include "gnunet_util_lib.h"
28 #include "gnunet_cadet_service.h"
32 * Different flags indicating the status of another peer.
37 * If we are waiting for a reply from that peer (sent a pull request).
39 Peers_PULL_REPLY_PENDING = 0x01,
41 /* IN_OTHER_GOSSIP_LIST = 0x02, unneeded? */
42 /* IN_OWN_SAMPLER_LIST = 0x04, unneeded? */
43 /* IN_OWN_GOSSIP_LIST = 0x08, unneeded? */
46 * We set this bit when we know the peer is online.
51 * We set this bit when we are going to destroy the channel to this peer.
52 * When cleanup_channel is called, we know that we wanted to destroy it.
53 * Otherwise the channel to the other peer was destroyed.
55 Peers_TO_DESTROY = 0x40,
59 * Keep track of the status of a channel.
61 * This is needed in order to know what to do with a channel when it's
64 enum Peers_ChannelFlags
67 * We destroyed the channel because the other peer established a second one.
69 Peers_CHANNEL_ESTABLISHED_TWICE = 0x1,
72 * The channel was removed because it was not needed any more. This should be
73 * the sending channel.
75 Peers_CHANNEL_CLEAN = 0x2,
79 * @brief The role of a channel. Sending or receiving.
81 enum Peers_ChannelRole
84 * Channel is used for sending
86 Peers_CHANNEL_ROLE_SENDING = 0x01,
89 * Channel is used for receiving
91 Peers_CHANNEL_ROLE_RECEIVING = 0x02,
95 * @brief Functions of this type can be used to be stored at a peer for later execution.
98 * @param peer peer to execute function on
100 typedef void (* PeerOp) (void *cls, const struct GNUNET_PeerIdentity *peer);
103 * @brief Iterator over valid peers.
106 * @param peer current public peer id
107 * @return #GNUNET_YES if we should continue to
112 (*PeersIterator) (void *cls,
113 const struct GNUNET_PeerIdentity *peer);
116 * @brief Initialise storage of peers
118 * @param fn_valid_peers filename of the file used to store valid peer ids
119 * @param cadet_h cadet handle
120 * @param own_id own peer identity
123 Peers_initialise (char* fn_valid_peers,
124 struct GNUNET_CADET_Handle *cadet_h,
125 const struct GNUNET_PeerIdentity *own_id);
128 * @brief Delete storage of peers that was created with #Peers_initialise ()
135 * @brief Get all currently known, valid peer ids.
137 * @param it function to call on each peer id
138 * @param it_cls extra argument to @a it
139 * @return the number of key value pairs processed,
140 * #GNUNET_SYSERR if it aborted iteration
143 Peers_get_valid_peers (PeersIterator iterator,
147 * @brief Add peer to known peers.
149 * This function is called on new peer_ids from 'external' sources
150 * (client seed, cadet get_peers(), ...)
152 * @param peer the new #GNUNET_PeerIdentity
154 * @return #GNUNET_YES if peer was inserted
155 * #GNUNET_NO otherwise (if peer was already known or
156 * peer was #own_identity)
159 Peers_insert_peer (const struct GNUNET_PeerIdentity *peer);
162 * @brief Try connecting to a peer to see whether it is online
164 * If not known yet, insert into known peers
166 * @param peer the peer whose liveliness is to be checked
167 * @return #GNUNET_YES if peer had to be inserted
168 * #GNUNET_NO otherwise (if peer was already known or
169 * peer was #own_identity)
172 Peers_check_peer_live (const struct GNUNET_PeerIdentity *peer);
175 * @brief Remove unecessary data
177 * If the other peer is not intending to send messages, we have messages pending
178 * to be sent to this peer and we are not waiting for a reply, remove the
179 * information about it (its #PeerContext).
181 * @param peer the peer to clean
182 * @return #GNUNET_YES if peer was removed
183 * #GNUNET_NO otherwise
186 Peers_clean_peer (const struct GNUNET_PeerIdentity *peer);
191 * @param peer the peer to clean
192 * @return #GNUNET_YES if peer was removed
193 * #GNUNET_NO otherwise
196 Peers_remove_peer (const struct GNUNET_PeerIdentity *peer);
199 * @brief set flags on a given peer.
201 * @param peer the peer to set flags on
202 * @param flags the flags
205 Peers_set_peer_flag (const struct GNUNET_PeerIdentity *peer, enum Peers_PeerFlags flags);
208 * @brief unset flags on a given peer.
210 * @param peer the peer to unset flags on
211 * @param flags the flags
214 Peers_unset_peer_flag (const struct GNUNET_PeerIdentity *peer, enum Peers_PeerFlags flags);
217 * @brief Check whether flags on a peer are set.
219 * @param peer the peer to check the flag of
220 * @param flags the flags to check
222 * @return #GNUNET_YES if all given flags are set
223 * ##GNUNET_NO otherwise
226 Peers_check_peer_flag (const struct GNUNET_PeerIdentity *peer, enum Peers_PeerFlags flags);
230 * @brief set flags on a given channel.
232 * @param channel the channel to set flags on
233 * @param flags the flags
236 Peers_set_channel_flag (uint32_t *channel_flags, enum Peers_ChannelFlags flags);
239 * @brief unset flags on a given channel.
241 * @param channel the channel to unset flags on
242 * @param flags the flags
245 Peers_unset_channel_flag (uint32_t *channel_flags, enum Peers_ChannelFlags flags);
248 * @brief Check whether flags on a channel are set.
250 * @param channel the channel to check the flag of
251 * @param flags the flags to check
253 * @return #GNUNET_YES if all given flags are set
254 * #GNUNET_NO otherwise
257 Peers_check_channel_flag (uint32_t *channel_flags, enum Peers_ChannelFlags flags);
260 * @brief Check whether we have information about the given peer.
262 * FIXME probably deprecated. Make this the new _online.
264 * @param peer peer in question
266 * @return #GNUNET_YES if peer is known
267 * #GNUNET_NO if peer is not knwon
270 Peers_check_peer_known (const struct GNUNET_PeerIdentity *peer);
273 * @brief Check whether @a peer is actually a peer.
275 * A valid peer is a peer that we know exists eg. we were connected to once.
277 * @param peer peer in question
279 * @return #GNUNET_YES if peer is valid
280 * #GNUNET_NO if peer is not valid
283 Peers_check_peer_valid (const struct GNUNET_PeerIdentity *peer);
286 * @brief Indicate that we want to send to the other peer
288 * This establishes a sending channel
290 * @param peer the peer to establish channel to
293 Peers_indicate_sending_intention (const struct GNUNET_PeerIdentity *peer);
296 * @brief Check whether other peer has the intention to send/opened channel
299 * @param peer the peer in question
301 * @return #GNUNET_YES if peer has the intention to send
302 * #GNUNET_NO otherwise
305 Peers_check_peer_send_intention (const struct GNUNET_PeerIdentity *peer);
308 * Handle the channel a peer opens to us.
310 * @param cls The closure
311 * @param channel The channel the peer wants to establish
312 * @param initiator The peer's peer ID
313 * @param port The port the channel is being established over
314 * @param options Further options
316 * @return initial channel context for the channel
317 * (can be NULL -- that's not an error)
320 Peers_handle_inbound_channel (void *cls,
321 struct GNUNET_CADET_Channel *channel,
322 const struct GNUNET_PeerIdentity *initiator,
324 enum GNUNET_CADET_ChannelOption options);
327 * @brief Check whether a sending channel towards the given peer exists
329 * @param peer the peer to check for
331 * @return #GNUNET_YES if a sending channel towards that peer exists
332 * #GNUNET_NO otherwise
335 Peers_check_sending_channel_exists (const struct GNUNET_PeerIdentity *peer);
338 * @brief check whether the given channel is the sending channel of the given
341 * @param peer the peer in question
342 * @param channel the channel to check for
343 * @param role either #Peers_CHANNEL_ROLE_SENDING, or
344 * #Peers_CHANNEL_ROLE_RECEIVING
346 * @return #GNUNET_YES if the given chennel is the sending channel of the peer
347 * #GNUNET_NO otherwise
350 Peers_check_channel_role (const struct GNUNET_PeerIdentity *peer,
351 const struct GNUNET_CADET_Channel *channel,
352 enum Peers_ChannelRole role);
355 * @brief Destroy the send channel of a peer e.g. stop indicating a sending
356 * intention to another peer
358 * If there is also no channel to receive messages from that peer, remove it
361 * @peer the peer identity of the peer whose sending channel to destroy
362 * @return #GNUNET_YES if channel was destroyed
363 * #GNUNET_NO otherwise
366 Peers_destroy_sending_channel (const struct GNUNET_PeerIdentity *peer);
369 * This is called when a channel is destroyed.
371 * Removes peer completely from our knowledge if the send_channel was destroyed
372 * Otherwise simply delete the recv_channel
374 * @param cls The closure
375 * @param channel The channel being closed
376 * @param channel_ctx The context associated with this channel
379 Peers_cleanup_destroyed_channel (void *cls,
380 const struct GNUNET_CADET_Channel *channel,
384 * @brief Issue a check whether peer is live
386 * This tries to establish a channel to the given peer. Once the channel is
387 * established successfully, we know the peer is live.
389 * @param peer the peer to check liveliness
392 Peers_issue_peer_liveliness_check (const struct GNUNET_PeerIdentity *peer);
395 * @brief Send a message to another peer.
397 * Keeps track about pending messages so they can be properly removed when the
400 * @param peer receeiver of the message
401 * @param ev envelope of the message
402 * @param type type of the message
405 Peers_send_message (const struct GNUNET_PeerIdentity *peer,
406 struct GNUNET_MQ_Envelope *ev,
410 * @brief Schedule a operation on given peer
412 * Avoids scheduling an operation twice.
414 * @param peer the peer we want to schedule the operation for once it gets live
416 * @return #GNUNET_YES if the operation was scheduled
417 * #GNUNET_NO otherwise
420 Peers_schedule_operation (const struct GNUNET_PeerIdentity *peer,
421 const PeerOp peer_op);
423 /* end of gnunet-service-rps_peers.h */