/*
This file is part of GNUnet.
- (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+ (C) 2009-2013 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
* @brief core service; this is the main API for encrypted P2P
* communications
* @author Christian Grothoff
+ * @defgroup core encrypted direct communication between peers
+ * @{
*/
#ifndef GNUNET_CORE_SERVICE_H
/**
* Version number of GNUnet-core API.
*/
-#define GNUNET_CORE_VERSION 0x00000000
+#define GNUNET_CORE_VERSION 0x00000001
/**
*
* @param cls closure
* @param peer peer identity this notification is about
- * @param atsi performance data for the connection
*/
typedef void (*GNUNET_CORE_ConnectEventHandler) (void *cls,
- const struct
- GNUNET_PeerIdentity *peer,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi);
-
-
-/**
- * Method called whenever a given peer has a status change.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
- * @param timeout absolute time when this peer will time out
- * unless we see some further activity from it
- * @param bandwidth_in available amount of inbound bandwidth
- * @param bandwidth_out available amount of outbound bandwidth
- * @param atsi performance data for the connection
- */
-typedef void (*GNUNET_CORE_PeerStatusEventHandler) (void *cls,
- const struct
- GNUNET_PeerIdentity *peer,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
- struct GNUNET_TIME_Absolute timeout,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi);
+ const struct GNUNET_PeerIdentity *peer);
/**
* @param peer peer identity this notification is about
*/
typedef void (*GNUNET_CORE_DisconnectEventHandler) (void *cls,
- const struct
- GNUNET_PeerIdentity *peer);
+ const struct GNUNET_PeerIdentity *peer);
/**
* Functions with this signature are called whenever a message is
* received or transmitted.
*
- * @param cls closure (set from GNUNET_CORE_connect)
+ * @param cls closure (set from #GNUNET_CORE_connect)
* @param peer the other peer involved (sender or receiver, NULL
* for loopback messages where we are both sender and receiver)
* @param message the actual message
- * @param atsi performance data for the connection
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close connection to the peer (signal serious error)
*/
-typedef int
- (*GNUNET_CORE_MessageCallback) (void *cls,
- const struct GNUNET_PeerIdentity *other,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi);
+typedef int (*GNUNET_CORE_MessageCallback) (void *cls,
+ const struct GNUNET_PeerIdentity *
+ other,
+ const struct GNUNET_MessageHeader *
+ message);
/**
/**
- * Function called after GNUNET_CORE_connect has succeeded
- * (or failed for good). Note that the private key of the
- * peer is intentionally not exposed here; if you need it,
- * your process should try to read the private key file
- * directly (which should work if you are authorized...).
+ * Function called after #GNUNET_CORE_connect has succeeded (or failed
+ * for good). Note that the private key of the peer is intentionally
+ * not exposed here; if you need it, your process should try to read
+ * the private key file directly (which should work if you are
+ * authorized...). Implementations of this function must not call
+ * #GNUNET_CORE_disconnect (other than by scheduling a new task to
+ * do this later).
*
* @param cls closure
- * @param server handle to the server, NULL if we failed
* @param my_identity ID of this peer, NULL if we failed
- * @param publicKey public key of this peer, NULL if we failed
*/
-typedef void
- (*GNUNET_CORE_StartupCallback) (void *cls,
- struct GNUNET_CORE_Handle * server,
- const struct GNUNET_PeerIdentity *
- my_identity,
- const struct
- GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
- publicKey);
+typedef void (*GNUNET_CORE_StartupCallback) (void *cls,
+ const struct GNUNET_PeerIdentity *my_identity);
/**
* (or fail) asynchronously. This function primarily causes the given
* callback notification functions to be invoked whenever the
* specified event happens. The maximum number of queued
- * notifications (queue length) is per client but the queue is shared
+ * notifications (queue length) is per client; the queue is shared
* across all types of notifications. So a slow client that registers
- * for 'outbound_notify' also risks missing 'inbound_notify' messages.
+ * for @a outbound_notify also risks missing @a inbound_notify messages.
* Certain events (such as connect/disconnect notifications) are not
* subject to queue size limitations.
*
* @param cfg configuration to use
- * @param queue_size size of the per-peer message queue
* @param cls closure for the various callbacks that follow (including handlers in the handlers array)
- * @param init callback to call on timeout or once we have successfully
- * connected to the core service; note that timeout is only meaningful if init is not NULL
+ * @param init callback to call once we have successfully
+ * connected to the core service
* @param connects function to call on peer connect, can be NULL
* @param disconnects function to call on peer disconnect / timeout, can be NULL
- * @param status_events function to call on peer status changes, can be NULL
* @param inbound_notify function to call for all inbound messages, can be NULL
* note that the core is allowed to drop notifications about inbound
* messages if the client does not process them fast enough (for this
* notification type, a bounded queue is used)
- * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
- * GNUNET_MessageHeader and hence we do not need to give it the full message;
+ * @param inbound_hdr_only set to #GNUNET_YES if @a inbound_notify will only read the
+ * `struct GNUNET_MessageHeader` and hence we do not need to give it the full message;
* can be used to improve efficiency, ignored if inbound_notify is NULL
* note that the core is allowed to drop notifications about inbound
* messages if the client does not process them fast enough (for this
- * notification type, a bounded queue is used)
+ * notification type, a bounded queue is used)
* @param outbound_notify function to call for all outbound messages, can be NULL;
* note that the core is allowed to drop notifications about outbound
* messages if the client does not process them fast enough (for this
* notification type, a bounded queue is used)
- * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
- * GNUNET_MessageHeader and hence we do not need to give it the full message
+ * @param outbound_hdr_only set to #GNUNET_YES if @a outbound_notify will only read the
+ * `struct GNUNET_MessageHeader` and hence we do not need to give it the full message
* can be used to improve efficiency, ignored if outbound_notify is NULL
* note that the core is allowed to drop notifications about outbound
* messages if the client does not process them fast enough (for this
* note that the core is allowed to drop notifications about inbound
* messages if the client does not process them fast enough (for this
* notification type, a bounded queue is used)
- * @return handle to the core service (only useful for disconnect until 'init' is called),
+ * @return handle to the core service (only useful for disconnect until @a init is called),
* NULL on error (in this case, init is never called)
*/
struct GNUNET_CORE_Handle *
GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
- unsigned int queue_size,
void *cls,
GNUNET_CORE_StartupCallback init,
GNUNET_CORE_ConnectEventHandler connects,
GNUNET_CORE_DisconnectEventHandler disconnects,
- GNUNET_CORE_PeerStatusEventHandler status_events,
GNUNET_CORE_MessageCallback inbound_notify,
int inbound_hdr_only,
GNUNET_CORE_MessageCallback outbound_notify,
/**
- * Disconnect from the core service. This function can only
- * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
+ * Disconnect from the core service. This function can only
+ * be called *after* all pending #GNUNET_CORE_notify_transmit_ready
* requests have been explicitly cancelled.
*
* @param handle connection to core to disconnect
*/
-void GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle);
-
-
-/**
- * Handle for a request to the core to connect or disconnect
- * from a particular peer. Can be used to cancel the request
- * (before the 'cont'inuation is called).
- */
-struct GNUNET_CORE_PeerRequestHandle;
-
-
-/**
- * Type of function called upon completion.
- *
- * @param cls closure
- * @param success GNUNET_OK on success (which for request_connect
- * ONLY means that we transmitted the connect request to CORE,
- * it does not mean that we are actually now connected!);
- * GNUNET_NO on timeout,
- * GNUNET_SYSERR if core was shut down
- */
-typedef void (*GNUNET_CORE_ControlContinuation)(void *cls, int success);
-
-
-/**
- * Request that the core should try to connect to a particular peer.
- * Once the request has been transmitted to the core, the continuation
- * function will be called. Note that this does NOT mean that a
- * connection was successfully established -- it only means that the
- * core will now try. Successful establishment of the connection
- * will be signalled to the 'connects' callback argument of
- * 'GNUNET_CORE_connect' only. If the core service does not respond
- * to our connection attempt within the given time frame, 'cont' will
- * be called with the TIMEOUT reason code.
- *
- * @param h core handle
- * @param peer who should we connect to
- * @param cont function to call once the request has been completed (or timed out)
- * @param cont_cls closure for cont
- * @return NULL on error (cont will not be called), otherwise handle for cancellation
- */
-struct GNUNET_CORE_PeerRequestHandle *
-GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
- const struct GNUNET_PeerIdentity * peer,
- GNUNET_CORE_ControlContinuation cont,
- void *cont_cls);
-
-
-/**
- * Cancel a pending request to connect to a particular peer. Must not
- * be called after the 'cont' function was invoked.
- *
- * @param req request handle that was returned for the original request
- */
void
-GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req);
+GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle);
/**
- * Function called with perference change information about the given peer.
- *
- * @param cls closure
- * @param peer identifies the peer
- * @param bandwidth_out available amount of outbound bandwidth
- * @param amount set to the amount that was actually reserved or unreserved;
- * either the full requested amount or zero (no partial reservations)
- * @param res_delay if the reservation could not be satisfied (amount was 0), how
- * long should the client wait until re-trying?
- * @param preference current traffic preference for the given peer
- */
-typedef void
- (*GNUNET_CORE_PeerConfigurationInfoCallback) (void *cls,
- const struct
- GNUNET_PeerIdentity *peer,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
- int32_t amount,
- struct GNUNET_TIME_Relative res_delay,
- uint64_t preference);
-
-
-
-/**
- * Context that can be used to cancel a peer information request.
+ * Handle for a transmission request.
*/
-struct GNUNET_CORE_InformationRequestContext;
+struct GNUNET_CORE_TransmitHandle;
/**
- * Obtain statistics and/or change preferences for the given peer.
- * You can only have one such pending request per peer.
+ * Ask the core to call @a notify once it is ready to transmit the
+ * given number of bytes to the specified @a target. Must only be
+ * called after a connection to the respective peer has been
+ * established (and the client has been informed about this). You may
+ * have one request of this type pending for each connected peer at
+ * any time. If a peer disconnects, the application MUST call
+ * #GNUNET_CORE_notify_transmit_ready_cancel on the respective
+ * transmission request, if one such request is pending.
*
- * @param h core handle
- * @param peer identifies the peer
- * @param timeout after how long should we give up (and call "info" with NULL
- * for "peer" to signal an error)?
- * @param bw_out set to the current bandwidth limit (sending) for this peer,
- * caller should set "bpm_out" to "GNUNET_BANDWIDTH_VALUE_MAX" to avoid changing
- * the current value; otherwise "bw_out" will be lowered to
- * the specified value; passing a pointer to "0" can be used to force
- * us to disconnect from the peer; "bw_out" might not increase
- * as specified since the upper bound is generally
- * determined by the other peer!
- * @param amount reserve N bytes for receiving, negative
- * amounts can be used to undo a (recent) reservation;
- * @param preference increase incoming traffic share preference by this amount;
- * in the absence of "amount" reservations, we use this
- * preference value to assign proportional bandwidth shares
- * to all connected peers
- * @param info function to call with the resulting configuration information
- * @param info_cls closure for info
- * @return NULL on error
+ * @param handle connection to core service
+ * @param cork is corking allowed for this transmission?
+ * @param priority how important is the message?
+ * @param maxdelay how long can the message wait?
+ * @param target who should receive the message, never NULL (can be this peer's identity for loopback)
+ * @param notify_size how many bytes of buffer space does notify want?
+ * @param notify function to call when buffer space is available;
+ * will be called with NULL on timeout; clients MUST cancel
+ * all pending transmission requests DURING the disconnect
+ * handler
+ * @param notify_cls closure for @a notify
+ * @return non-NULL if the notify callback was queued,
+ * NULL if we can not even queue the request (request already pending);
+ * if NULL is returned, "notify" will NOT be called.
*/
-struct GNUNET_CORE_InformationRequestContext *
-GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
- const struct GNUNET_PeerIdentity *peer,
- struct GNUNET_TIME_Relative timeout,
- struct GNUNET_BANDWIDTH_Value32NBO bw_out,
- int32_t amount,
- uint64_t preference,
- GNUNET_CORE_PeerConfigurationInfoCallback info,
- void *info_cls);
+struct GNUNET_CORE_TransmitHandle *
+GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle, int cork,
+ uint32_t priority,
+ struct GNUNET_TIME_Relative maxdelay,
+ const struct GNUNET_PeerIdentity *target,
+ size_t notify_size,
+ GNUNET_CONNECTION_TransmitReadyNotify notify,
+ void *notify_cls);
/**
- * Cancel request for getting information about a peer.
- * Note that an eventual change in preference, trust or bandwidth
- * assignment MAY have already been committed at the time,
- * so cancelling a request is NOT sure to undo the original
- * request. The original request may or may not still commit.
- * The only thing cancellation ensures is that the callback
- * from the original request will no longer be called.
+ * Cancel the specified transmission-ready notification.
*
- * @param irc context returned by the original GNUNET_CORE_peer_get_info call
+ * @param th handle that was returned by "notify_transmit_ready".
*/
void
-GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc);
+GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
+ *th);
/**
- * Iterate over all connected peers.
+ * Iterate over all connected peers. Calls @a peer_cb with each
+ * connected peer, and then once with NULL to indicate that all peers
+ * have been handled. Normal users of the CORE API are not expected
+ * to use this function. It is different in that it truly lists
+ * all connections, not just those relevant to the application. This
+ * function is used by special applications for diagnostics. This
+ * function is NOT part of the 'versioned', 'official' API.
+ *
+ * FIXME: we should probably make it possible to 'cancel' the
+ * operation...
*
* @param cfg configuration handle
* @param peer_cb function to call with the peer information
- * @param cb_cls closure for peer_cb
- * @return GNUNET_OK on success, GNUNET_SYSERR on errors
+ * @param cb_cls closure for @a peer_cb
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on errors
*/
int
GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
GNUNET_CORE_ConnectEventHandler peer_cb,
void *cb_cls);
-/**
- * Iterate over all currently connected peers.
- * Calls peer_cb with each connected peer, and then
- * once with NULL to indicate that all peers have
- * been handled.
- *
- * @param cfg configuration to use
- * @param peer the specific peer to check for
- * @param peer_cb function to call with the peer information
- * @param cb_cls closure for peer_cb
- *
- * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
- */
-int
-GNUNET_CORE_is_peer_connected (const struct GNUNET_CONFIGURATION_Handle *cfg,
- struct GNUNET_PeerIdentity *peer,
- GNUNET_CORE_ConnectEventHandler peer_cb,
- void *cb_cls);
-
/**
- * Handle for a transmission request.
- */
-struct GNUNET_CORE_TransmitHandle;
-
-
-/**
- * Ask the core to call "notify" once it is ready to transmit the
- * given number of bytes to the specified "target". Must only be
- * called after a connection to the respective peer has been
- * established (and the client has been informed about this).
- *
+ * Check if the given peer is currently connected. This function is for special
+ * cirumstances (GNUNET_TESTBED uses it), normal users of the CORE API are
+ * expected to track which peers are connected based on the connect/disconnect
+ * callbacks from #GNUNET_CORE_connect. This function is NOT part of the
+ * 'versioned', 'official' API. This function returns
+ * synchronously after looking in the CORE API cache.
*
- * @param handle connection to core service
- * @param cork is corking allowed for this transmission?
- * @param priority how important is the message?
- * @param maxdelay how long can the message wait?
- * @param target who should receive the message,
- * use NULL for this peer (loopback)
- * @param notify_size how many bytes of buffer space does notify want?
- * @param notify function to call when buffer space is available;
- * will be called with NULL on timeout or if the overall queue
- * for this peer is larger than queue_size and this is currently
- * the message with the lowest priority; will also be called
- * with 'NULL' buf if the peer disconnects; since the disconnect
- * signal will be emmitted even later, clients MUST cancel
- * all pending transmission requests DURING the disconnect
- * handler (unless they ensure that 'notify' never calls
- * 'GNUNET_CORE_notify_transmit_ready').
- * @param notify_cls closure for notify
- * @return non-NULL if the notify callback was queued,
- * NULL if we can not even queue the request (insufficient
- * memory); if NULL is returned, "notify" will NOT be called.
+ * @param h the core handle
+ * @param pid the identity of the peer to check if it has been connected to us
+ * @return #GNUNET_YES if the peer is connected to us; #GNUNET_NO if not
*/
-struct GNUNET_CORE_TransmitHandle *
-GNUNET_CORE_notify_transmit_ready (struct
- GNUNET_CORE_Handle
- *handle,
- int cork,
- uint32_t priority,
- struct
- GNUNET_TIME_Relative
- maxdelay,
- const
- struct
- GNUNET_PeerIdentity
- *target,
- size_t
- notify_size,
- GNUNET_CONNECTION_TransmitReadyNotify
- notify,
- void
- *notify_cls);
+int
+GNUNET_CORE_is_peer_connected_sync (const struct GNUNET_CORE_Handle *h,
+ const struct GNUNET_PeerIdentity *pid);
/**
- * Cancel the specified transmission-ready notification.
+ * Create a message queue for sending messages to a peer with CORE.
+ * Messages may only be queued with #GNUNET_MQ_send once the init callback has
+ * been called for the given handle.
+ * There must only be one queue per peer for each core handle.
+ * The message queue can only be used to transmit messages,
+ * not to receive them.
*
- * @param th handle that was returned by "notify_transmit_ready".
+ * @param h the core handle
+ * @param target the target peer for this queue, may not be NULL
+ * @return a message queue for sending messages over the core handle
+ * to the target peer
*/
-void
-GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
- *th);
+struct GNUNET_MQ_Handle *
+GNUNET_CORE_mq_create (struct GNUNET_CORE_Handle *h,
+ const struct GNUNET_PeerIdentity *target);
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
+/** @} */ /* end of group core */
+
/* ifndef GNUNET_CORE_SERVICE_H */
#endif
/* end of gnunet_core_service.h */
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