kc3-lang/libevent/evrpc-internal.h

• Show log

  Commit

• Hash : 2460aa59
  Author :
  Date : 2007-12-31T19:33:30
  

  allow hooks to get access to the connection object
  
  svn:r623
  

Download

• evrpc-internal.h

• /*
   * Copyright (c) 2006 Niels Provos <provos@citi.umich.edu>
   * All rights reserved.
   *
   * 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 _EVRPC_INTERNAL_H_
  #define _EVRPC_INTERNAL_H_
  
  #include "http-internal.h"
  
  struct evrpc;
  
  #define EVRPC_URI_PREFIX "/.rpc."
  
  struct evrpc_hook {
  	TAILQ_ENTRY(evrpc_hook) (next);
  
  	/* returns EVRPC_TERMINATE; if the rpc should be aborted.
  	 * a hook is is allowed to rewrite the evbuffer
  	 */
  	int (*process)(void *, struct evhttp_request *,
  	    struct evbuffer *, void *);
  	void *process_arg;
  };
  
  TAILQ_HEAD(evrpc_hook_list, evrpc_hook);
  
  /*
   * this is shared between the base and the pool, so that we can reuse
   * the hook adding functions; we alias both evrpc_pool and evrpc_base
   * to this common structure.
   */
  
  struct evrpc_hook_ctx;
  TAILQ_HEAD(evrpc_pause_list, evrpc_hook_ctx);
  
  struct _evrpc_hooks {
  	/* hooks for processing outbound and inbound rpcs */
  	struct evrpc_hook_list in_hooks;
  	struct evrpc_hook_list out_hooks;
  	
  	struct evrpc_pause_list pause_requests;
  };
  
  #define input_hooks common.in_hooks
  #define output_hooks common.out_hooks
  #define paused_requests common.pause_requests
  
  struct evrpc_base {
  	struct _evrpc_hooks common;
  
  	/* the HTTP server under which we register our RPC calls */
  	struct evhttp* http_server;
  
  	/* a list of all RPCs registered with us */
  	TAILQ_HEAD(evrpc_list, evrpc) registered_rpcs;
  };
  
  struct evrpc_req_generic;
  void evrpc_reqstate_free(struct evrpc_req_generic* rpc_state);
  
  /* A pool for holding evhttp_connection objects */
  struct evrpc_pool {
  	struct _evrpc_hooks common;
  
  	struct event_base *base;
  
  	struct evconq connections;
  
  	int timeout;
  
  	TAILQ_HEAD(evrpc_requestq, evrpc_request_wrapper) (requests);
  };
  
  struct evrpc_hook_ctx {
  	TAILQ_ENTRY(evrpc_hook_ctx) (next);
  
  	void *ctx;
  	void (*cb)(void *, enum EVRPC_HOOK_RESULT);
  };
  
  struct evrpc_meta {
  	TAILQ_ENTRY(evrpc_meta) (next);
  	char *key;
  
  	void *data;
  	size_t data_size;
  };
  
  TAILQ_HEAD(evrpc_meta_list, evrpc_meta);
  
  struct evrpc_hook_meta {
  	struct evrpc_meta_list meta_data;
  	struct evhttp_connection *evcon;
  };
  
  /* allows association of meta data with a request */
  static void evrpc_hook_associate_meta(struct evrpc_hook_meta **pctx,
      struct evhttp_connection *evcon);
  
  /* creates a new meta data store */
  static struct evrpc_hook_meta *evrpc_hook_meta_new(void);
  
  /* frees the meta data associated with a request */
  static void evrpc_hook_context_free(struct evrpc_hook_meta *ctx);
  
  #endif /* _EVRPC_INTERNAL_H_ */
  

Download