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 * Copyright (c) 2006-2007 Niels Provos <provos@citi.umich.edu>
 * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef EVENT2_RPC_H_INCLUDED_
#define EVENT2_RPC_H_INCLUDED_

/* For int types. */
#include <event2/util.h>
#include <event2/visibility.h>

#ifdef __cplusplus
extern "C" {
#endif

/** @file rpc.h
 *
 * This header files provides basic support for an RPC server and client.
 *
 * To support RPCs in a server, every supported RPC command needs to be
 * defined and registered.
 *
 * EVRPC_HEADER(SendCommand, Request, Reply);
 *
 *  SendCommand is the name of the RPC command.
 *  Request is the name of a structure generated by event_rpcgen.py.
 *    It contains all parameters relating to the SendCommand RPC.  The
 *    server needs to fill in the Reply structure.
 *  Reply is the name of a structure generated by event_rpcgen.py.  It
 *    contains the answer to the RPC.
 *
 * To register an RPC with an HTTP server, you need to first create an RPC
 * base with:
 *
 *   struct evrpc_base *base = evrpc_init(http);
 *
 * A specific RPC can then be registered with
 *
 * EVRPC_REGISTER(base, SendCommand, Request, Reply,  FunctionCB, arg);
 *
 * when the server receives an appropriately formatted RPC, the user callback
 * is invoked.   The callback needs to fill in the reply structure.
 *
 * void FunctionCB(EVRPC_STRUCT(SendCommand)* rpc, void *arg);
 *
 * To send the reply, call EVRPC_REQUEST_DONE(rpc);
 *
 * See the regression test for an example.
 */

/**
   Determines if the member has been set in the message

   @param msg the message to inspect
   @param member the member variable to test for presences
   @return 1 if it's present or 0 otherwise.
*/
#define EVTAG_HAS(msg, member) \
	((msg)->member##_set == 1)

#ifndef EVENT2_RPC_COMPAT_H_INCLUDED_

/**
   Assigns a value to the member in the message.

   @param msg the message to which to assign a value
   @param member the name of the member variable
   @param value the value to assign
*/
#define EVTAG_ASSIGN(msg, member, value) \
	(*(msg)->base->member##_assign)((msg), (value))
/**
   Assigns a value to the member in the message.

   @param msg the message to which to assign a value
   @param member the name of the member variable
   @param value the value to assign
   @param len the length of the value
*/
#define EVTAG_ASSIGN_WITH_LEN(msg, member, value, len)	\
	(*(msg)->base->member##_assign)((msg), (value), (len))
/**
   Returns the value for a member.

   @param msg the message from which to get the value
   @param member the name of the member variable
   @