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Diffstat (limited to 'contrib/ntp/sntp/libevent/evrpc-internal.h')
| -rw-r--r-- | contrib/ntp/sntp/libevent/evrpc-internal.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/contrib/ntp/sntp/libevent/evrpc-internal.h b/contrib/ntp/sntp/libevent/evrpc-internal.h new file mode 100644 index 0000000..e53d06e --- /dev/null +++ b/contrib/ntp/sntp/libevent/evrpc-internal.h @@ -0,0 +1,204 @@ +/* + * 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 EVRPC_INTERNAL_H_INCLUDED_ +#define EVRPC_INTERNAL_H_INCLUDED_ + +#include "http-internal.h" + +struct evrpc; +struct evrpc_request_wrapper; + +#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); + +/* the server side of an rpc */ + +/* We alias the RPC specific structs to this voided one */ +struct evrpc_req_generic { + /* + * allows association of meta data via hooks - needs to be + * synchronized with evrpc_request_wrapper + */ + struct evrpc_hook_meta *hook_meta; + + /* the unmarshaled request object */ + void *request; + + /* the empty reply object that needs to be filled in */ + void *reply; + + /* + * the static structure for this rpc; that can be used to + * automatically unmarshal and marshal the http buffers. + */ + struct evrpc *rpc; + + /* + * the http request structure on which we need to answer. + */ + struct evhttp_request* http_req; + + /* + * Temporary data store for marshaled data + */ + struct evbuffer* rpc_data; +}; + +/* the client side of an rpc request */ +struct evrpc_request_wrapper { + /* + * allows association of meta data via hooks - needs to be + * synchronized with evrpc_req_generic. + */ + struct evrpc_hook_meta *hook_meta; + + TAILQ_ENTRY(evrpc_request_wrapper) next; + + /* pool on which this rpc request is being made */ + struct evrpc_pool *pool; + + /* connection on which the request is being sent */ + struct evhttp_connection *evcon; + + /* the actual request */ + struct evhttp_request *req; + + /* event for implementing request timeouts */ + struct event ev_timeout; + + /* the name of the rpc */ + char *name; + + /* callback */ + void (*cb)(struct evrpc_status*, void *request, void *reply, void *arg); + void *cb_arg; + + void *request; + void *reply; + + /* unmarshals the buffer into the proper request structure */ + void (*request_marshal)(struct evbuffer *, void *); + + /* removes all stored state in the reply */ + void (*reply_clear)(void *); + + /* marshals the reply into a buffer */ + int (*reply_unmarshal)(void *, struct evbuffer*); +}; + +#endif /* EVRPC_INTERNAL_H_INCLUDED_ */ |
