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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 Initialise storage of peers
105 * @param cadet_h cadet handle
106 * @param own_id own peer identity
109 Peers_initialise (struct GNUNET_CADET_Handle *cadet_h,
110 const struct GNUNET_PeerIdentity *own_id);
113 * @brief Delete storage of peers that was created with #Peers_initialise ()
119 * @brief Add peer to known peers.
121 * This function is called on new peer_ids from 'external' sources
122 * (client seed, cadet get_peers(), ...)
124 * @param peer the new #GNUNET_PeerIdentity
126 * @return #GNUNET_YES if peer was inserted
127 * #GNUNET_NO if peer was already known
130 Peers_insert_peer (const struct GNUNET_PeerIdentity *peer);
133 * @brief Add peer to known peers and check for liveliness.
135 * This function is called on new peer_ids from 'external' sources
136 * (client seed, cadet get_peers(), ...)
138 * @param peer the new #GNUNET_PeerIdentity
140 * @return #GNUNET_YES if peer was inserted
141 * #GNUNET_NO if peer was already known
144 Peers_insert_peer_check_liveliness (const struct GNUNET_PeerIdentity *peer);
147 * @brief Remove unecessary data
149 * If the other peer is not intending to send messages, we have messages pending
150 * to be sent to this peer and we are not waiting for a reply, remove the
151 * information about it (its #PeerContext).
153 * @param peer the peer to clean
154 * @return #GNUNET_YES if peer was removed
155 * #GNUNET_NO otherwise
158 Peers_clean_peer (const struct GNUNET_PeerIdentity *peer);
163 * @param peer the peer to clean
164 * @return #GNUNET_YES if peer was removed
165 * #GNUNET_NO otherwise
168 Peers_remove_peer (const struct GNUNET_PeerIdentity *peer);
171 * @brief set flags on a given peer.
173 * @param peer the peer to set flags on
174 * @param flags the flags
177 Peers_set_peer_flag (const struct GNUNET_PeerIdentity *peer, enum Peers_PeerFlags flags);
180 * @brief unset flags on a given peer.
182 * @param peer the peer to unset flags on
183 * @param flags the flags
186 Peers_unset_peer_flag (const struct GNUNET_PeerIdentity *peer, enum Peers_PeerFlags flags);
189 * @brief Check whether flags on a peer are set.
191 * @param peer the peer to check the flag of
192 * @param flags the flags to check
194 * @return #GNUNET_YES if all given flags are set
195 * ##GNUNET_NO otherwise
198 Peers_check_peer_flag (const struct GNUNET_PeerIdentity *peer, enum Peers_PeerFlags flags);
202 * @brief set flags on a given channel.
204 * @param channel the channel to set flags on
205 * @param flags the flags
208 Peers_set_channel_flag (uint32_t *channel_flags, enum Peers_ChannelFlags flags);
211 * @brief unset flags on a given channel.
213 * @param channel the channel to unset flags on
214 * @param flags the flags
217 Peers_unset_channel_flag (uint32_t *channel_flags, enum Peers_ChannelFlags flags);
220 * @brief Check whether flags on a channel are set.
222 * @param channel the channel to check the flag of
223 * @param flags the flags to check
225 * @return #GNUNET_YES if all given flags are set
226 * #GNUNET_NO otherwise
229 Peers_check_channel_flag (uint32_t *channel_flags, enum Peers_ChannelFlags flags);
232 * @brief Check whether we have information about the given peer.
234 * FIXME probably deprecated. Make this the new _online.
236 * @param peer peer in question
238 * @return #GNUNET_YES if peer is known
239 * #GNUNET_NO if peer is not knwon
242 Peers_check_peer_known (const struct GNUNET_PeerIdentity *peer);
245 * @brief Check whether @a peer is actually a peer.
247 * A valid peer is a peer that we know exists eg. we were connected to once.
249 * @param peer peer in question
251 * @return #GNUNET_YES if peer is valid
252 * #GNUNET_NO if peer is not valid
255 Peers_check_peer_valid (const struct GNUNET_PeerIdentity *peer);
258 * @brief Indicate that we want to send to the other peer
260 * This establishes a sending channel
262 * @param peer the peer to establish channel to
265 Peers_indicate_sending_intention (const struct GNUNET_PeerIdentity *peer);
268 * @brief Check whether other peer has the intention to send/opened channel
271 * @param peer the peer in question
273 * @return #GNUNET_YES if peer has the intention to send
274 * #GNUNET_NO otherwise
277 Peers_check_peer_send_intention (const struct GNUNET_PeerIdentity *peer);
280 * Handle the channel a peer opens to us.
282 * @param cls The closure
283 * @param channel The channel the peer wants to establish
284 * @param initiator The peer's peer ID
285 * @param port The port the channel is being established over
286 * @param options Further options
288 * @return initial channel context for the channel
289 * (can be NULL -- that's not an error)
292 Peers_handle_inbound_channel (void *cls,
293 struct GNUNET_CADET_Channel *channel,
294 const struct GNUNET_PeerIdentity *initiator,
296 enum GNUNET_CADET_ChannelOption options);
299 * @brief Check whether a sending channel towards the given peer exists
301 * @param peer the peer to check for
303 * @return #GNUNET_YES if a sending channel towards that peer exists
304 * #GNUNET_NO otherwise
307 Peers_check_sending_channel_exists (const struct GNUNET_PeerIdentity *peer);
310 * @brief check whether the given channel is the sending channel of the given
313 * @param peer the peer in question
314 * @param channel the channel to check for
315 * @param role either #Peers_CHANNEL_ROLE_SENDING, or
316 * #Peers_CHANNEL_ROLE_RECEIVING
318 * @return #GNUNET_YES if the given chennel is the sending channel of the peer
319 * #GNUNET_NO otherwise
322 Peers_check_channel_role (const struct GNUNET_PeerIdentity *peer,
323 const struct GNUNET_CADET_Channel *channel,
324 enum Peers_ChannelRole role);
327 * @brief Destroy the send channel of a peer e.g. stop indicating a sending
328 * intention to another peer
330 * If there is also no channel to receive messages from that peer, remove it
333 * @peer the peer identity of the peer whose sending channel to destroy
334 * @return #GNUNET_YES if channel was destroyed
335 * #GNUNET_NO otherwise
338 Peers_destroy_sending_channel (const struct GNUNET_PeerIdentity *peer);
341 * This is called when a channel is destroyed.
343 * Removes peer completely from our knowledge if the send_channel was destroyed
344 * Otherwise simply delete the recv_channel
346 * @param cls The closure
347 * @param channel The channel being closed
348 * @param channel_ctx The context associated with this channel
351 Peers_cleanup_destroyed_channel (void *cls,
352 const struct GNUNET_CADET_Channel *channel,
356 * @brief Issue a check whether peer is live
358 * This tries to establish a channel to the given peer. Once the channel is
359 * established successfully, we know the peer is live.
361 * @param peer the peer to check liveliness
364 Peers_issue_peer_liveliness_check (const struct GNUNET_PeerIdentity *peer);
367 * @brief Send a message to another peer.
369 * Keeps track about pending messages so they can be properly removed when the
372 * @param peer receeiver of the message
373 * @param ev envelope of the message
374 * @param type type of the message
377 Peers_send_message (const struct GNUNET_PeerIdentity *peer,
378 struct GNUNET_MQ_Envelope *ev,
382 * @brief Schedule a operation on given peer
384 * Avoids scheduling an operation twice.
386 * @param peer the peer we want to schedule the operation for once it gets live
388 * @return #GNUNET_YES if the operation was scheduled
389 * #GNUNET_NO otherwise
392 Peers_schedule_operation (const struct GNUNET_PeerIdentity *peer,
393 const PeerOp peer_op);
395 /* end of gnunet-service-rps_peers.h */