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- /*
- This file is part of GNUnet
- Copyright (C) 2013, 2014, 2020 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @author Florian Dold
- * @author Christian Grothoff
- *
- * @file
- * Two-peer set intersection operations
- *
- * @defgroup set Set intersection service
- * Two-peer set operations
- *
- * @{
- */
- #ifndef GNUNET_SETI_SERVICE_H
- #define GNUNET_SETI_SERVICE_H
- #ifdef __cplusplus
- extern "C"
- {
- #if 0 /* keep Emacsens' auto-indent happy */
- }
- #endif
- #endif
- #include "gnunet_common.h"
- #include "gnunet_time_lib.h"
- #include "gnunet_configuration_lib.h"
- /**
- * Maximum size of a context message for set operation requests.
- */
- #define GNUNET_SETI_CONTEXT_MESSAGE_MAX_SIZE ((1 << 16) - 1024)
- /**
- * Opaque handle to a set.
- */
- struct GNUNET_SETI_Handle;
- /**
- * Opaque handle to a set operation request from another peer.
- */
- struct GNUNET_SETI_Request;
- /**
- * Opaque handle to a listen operation.
- */
- struct GNUNET_SETI_ListenHandle;
- /**
- * Opaque handle to a set operation.
- */
- struct GNUNET_SETI_OperationHandle;
- /**
- * Status for the result callback
- */
- enum GNUNET_SETI_Status
- {
- /**
- * Element should be added to the result set of the local peer, i.e. the
- * element is in the intersection.
- */
- GNUNET_SETI_STATUS_ADD_LOCAL,
- /**
- * Element should be delete from the result set of the local peer, i.e. the
- * local peer is having an element that is not in the intersection.
- */
- GNUNET_SETI_STATUS_DEL_LOCAL,
- /**
- * The other peer refused to do the operation with us, or something went
- * wrong.
- */
- GNUNET_SETI_STATUS_FAILURE,
- /**
- * Success, all elements have been sent (and received).
- */
- GNUNET_SETI_STATUS_DONE
- };
- /**
- * Element stored in a set.
- */
- struct GNUNET_SETI_Element
- {
- /**
- * Number of bytes in the buffer pointed to by data.
- */
- uint16_t size;
- /**
- * Application-specific element type.
- */
- uint16_t element_type;
- /**
- * Actual data of the element
- */
- const void *data;
- };
- /**
- * Possible options to pass to a set operation.
- *
- * Used as tag for struct #GNUNET_SETI_Option.
- */
- enum GNUNET_SETI_OptionType
- {
- /**
- * List terminator.
- */
- GNUNET_SETI_OPTION_END = 0,
- /**
- * Return the elements remaining in the intersection
- * (#GNUNET_SETI_STATUS_ADD_LOCAL). If not given, the default is to return a
- * list of the elements to be removed (#GNUNET_SETI_STATUS_DEL_LOCAL).
- */
- GNUNET_SETI_OPTION_RETURN_INTERSECTION = 1,
- };
- /**
- * Option for set operations.
- */
- struct GNUNET_SETI_Option
- {
- /**
- * Type of the option.
- */
- enum GNUNET_SETI_OptionType type;
- /**
- * Value for the option, only used with some options.
- */
- union
- {
- uint64_t num;
- } v;
- };
- /**
- * Callback for set union operation results. Called for each element
- * in the result set.
- *
- * @param cls closure
- * @param element a result element, only valid if status is #GNUNET_SETI_STATUS_OK
- * @param current_size current set size
- * @param status see `enum GNUNET_SETI_Status`
- */
- typedef void
- (*GNUNET_SETI_ResultIterator) (void *cls,
- const struct GNUNET_SETI_Element *element,
- uint64_t current_size,
- enum GNUNET_SETI_Status status);
- /**
- * Called when another peer wants to do a set operation with the
- * local peer. If a listen error occurs, the @a request is NULL.
- *
- * @param cls closure
- * @param other_peer the other peer
- * @param context_msg message with application specific information from
- * the other peer
- * @param request request from the other peer (never NULL), use GNUNET_SETI_accept()
- * to accept it, otherwise the request will be refused
- * Note that we can't just return value from the listen callback,
- * as it is also necessary to specify the set we want to do the
- * operation with, with sometimes can be derived from the context
- * message. It's necessary to specify the timeout.
- */
- typedef void
- (*GNUNET_SETI_ListenCallback) (void *cls,
- const struct GNUNET_PeerIdentity *other_peer,
- const struct GNUNET_MessageHeader *context_msg,
- struct GNUNET_SETI_Request *request);
- /**
- * Create an empty set, supporting the specified operation.
- *
- * @param cfg configuration to use for connecting to the
- * set service
- * @return a handle to the set
- */
- struct GNUNET_SETI_Handle *
- GNUNET_SETI_create (const struct GNUNET_CONFIGURATION_Handle *cfg);
- /**
- * Add an element to the given set.
- *
- * @param set set to add element to
- * @param element element to add to the set
- * @param cb function to call when finished, can be NULL
- * @param cb_cls closure for @a cb
- * @return #GNUNET_OK on success, #GNUNET_SYSERR if the
- * set is invalid (e.g. the set service crashed)
- */
- int
- GNUNET_SETI_add_element (struct GNUNET_SETI_Handle *set,
- const struct GNUNET_SETI_Element *element,
- GNUNET_SCHEDULER_TaskCallback cb,
- void *cb_cls);
- /**
- * Destroy the set handle, and free all associated resources. Operations may
- * still be pending when a set is destroyed (and will be allowed to complete).
- *
- * @param set set to destroy
- */
- void
- GNUNET_SETI_destroy (struct GNUNET_SETI_Handle *set);
- /**
- * Prepare a set operation to be evaluated with another peer. The evaluation
- * will not start until the client provides a local set with
- * GNUNET_SETI_commit().
- *
- * @param other_peer peer with the other set
- * @param app_id hash for the application using the set
- * @param context_msg additional information for the request
- * @param options options to use when processing the request
- * @param result_cb called on error or success
- * @param result_cls closure for @a result_cb
- * @return a handle to cancel the operation
- */
- struct GNUNET_SETI_OperationHandle *
- GNUNET_SETI_prepare (const struct GNUNET_PeerIdentity *other_peer,
- const struct GNUNET_HashCode *app_id,
- const struct GNUNET_MessageHeader *context_msg,
- const struct GNUNET_SETI_Option options[],
- GNUNET_SETI_ResultIterator result_cb,
- void *result_cls);
- /**
- * Wait for set operation requests for the given application ID.
- * If the connection to the set service is lost, the listener is
- * re-created transparently with exponential backoff.
- *
- * @param cfg configuration to use for connecting to
- * the set service
- * @param app_id id of the application that handles set operation requests
- * @param listen_cb called for each incoming request matching the operation
- * and application id
- * @param listen_cls handle for @a listen_cb
- * @return a handle that can be used to cancel the listen operation
- */
- struct GNUNET_SETI_ListenHandle *
- GNUNET_SETI_listen (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const struct GNUNET_HashCode *app_id,
- GNUNET_SETI_ListenCallback listen_cb,
- void *listen_cls);
- /**
- * Cancel the given listen operation. After calling cancel, the
- * listen callback for this listen handle will not be called again.
- * Note that cancelling a listen operation will automatically reject
- * all operations that have not yet been accepted.
- *
- * @param lh handle for the listen operation
- */
- void
- GNUNET_SETI_listen_cancel (struct GNUNET_SETI_ListenHandle *lh);
- /**
- * Accept a request we got via GNUNET_SETI_listen(). Must be called during
- * GNUNET_SETI_listen(), as the `struct GNUNET_SETI_Request` becomes invalid
- * afterwards.
- * Call GNUNET_SETI_commit() to provide the local set to use for the operation,
- * and to begin the exchange with the remote peer.
- *
- * @param request request to accept
- * @param options options to use when processing the request
- * @param result_cb callback for the results
- * @param result_cls closure for @a result_cb
- * @return a handle to cancel the operation
- */
- struct GNUNET_SETI_OperationHandle *
- GNUNET_SETI_accept (struct GNUNET_SETI_Request *request,
- const struct GNUNET_SETI_Option options[],
- GNUNET_SETI_ResultIterator result_cb,
- void *result_cls);
- /**
- * Commit a set to be used with a set operation.
- * This function is called once we have fully constructed
- * the set that we want to use for the operation. At this
- * time, the P2P protocol can then begin to exchange the
- * set information and call the result callback with the
- * result information.
- *
- * @param oh handle to the set operation
- * @param set the set to use for the operation
- * @return #GNUNET_OK on success, #GNUNET_SYSERR if the
- * set is invalid (e.g. the set service crashed)
- */
- int
- GNUNET_SETI_commit (struct GNUNET_SETI_OperationHandle *oh,
- struct GNUNET_SETI_Handle *set);
- /**
- * Cancel the given set operation. May not be called after the operation's
- * `GNUNET_SETI_ResultIterator` has been called with a status of
- * #GNUNET_SETI_STATUS_FAILURE or #GNUNET_SETI_STATUS_DONE.
- *
- * @param oh set operation to cancel
- */
- void
- GNUNET_SETI_operation_cancel (struct GNUNET_SETI_OperationHandle *oh);
- /**
- * Hash a set element.
- *
- * @param element the element that should be hashed
- * @param[out] ret_hash a pointer to where the hash of @a element
- * should be stored
- */
- void
- GNUNET_SETI_element_hash (const struct GNUNET_SETI_Element *element,
- struct GNUNET_HashCode *ret_hash);
- #if 0 /* keep Emacsens' auto-indent happy */
- {
- #endif
- #ifdef __cplusplus
- }
- #endif
- #endif
- /** @} */ /* end of group */
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