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evrpc-internal.h
1 /*
2 * Copyright (c) 2006-2007 Niels Provos <provos@citi.umich.edu>
3 * Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27 #ifndef _EVRPC_INTERNAL_H_
28 #define _EVRPC_INTERNAL_H_
29
30 #include "http-internal.h"
31
32 struct evrpc;
33 struct evrpc_request_wrapper;
34
35 #define EVRPC_URI_PREFIX "/.rpc."
36
37 struct evrpc_hook {
38 TAILQ_ENTRY(evrpc_hook) next;
39
40 /* returns EVRPC_TERMINATE; if the rpc should be aborted.
41 * a hook is is allowed to rewrite the evbuffer
42 */
43 int (*process)(void *, struct evhttp_request *,
44 struct evbuffer *, void *);
45 void *process_arg;
46 };
47
48 TAILQ_HEAD(evrpc_hook_list, evrpc_hook);
49
50 /*
51 * this is shared between the base and the pool, so that we can reuse
52 * the hook adding functions; we alias both evrpc_pool and evrpc_base
53 * to this common structure.
54 */
55
56 struct evrpc_hook_ctx;
57 TAILQ_HEAD(evrpc_pause_list, evrpc_hook_ctx);
58
59 struct _evrpc_hooks {
60 /* hooks for processing outbound and inbound rpcs */
61 struct evrpc_hook_list in_hooks;
62 struct evrpc_hook_list out_hooks;
63
64 struct evrpc_pause_list pause_requests;
65 };
66
67 #define input_hooks common.in_hooks
68 #define output_hooks common.out_hooks
69 #define paused_requests common.pause_requests
70
71 struct evrpc_base {
72 struct _evrpc_hooks common;
73
74 /* the HTTP server under which we register our RPC calls */
75 struct evhttp* http_server;
76
77 /* a list of all RPCs registered with us */
78 TAILQ_HEAD(evrpc_list, evrpc) registered_rpcs;
79 };
80
81 struct evrpc_req_generic;
82 void evrpc_reqstate_free(struct evrpc_req_generic* rpc_state);
83
84 /* A pool for holding evhttp_connection objects */
85 struct evrpc_pool {
86 struct _evrpc_hooks common;
87
88 struct event_base *base;
89
90 struct evconq connections;
91
92 int timeout;
93
94 TAILQ_HEAD(evrpc_requestq, evrpc_request_wrapper) (requests);
95 };
96
97 struct evrpc_hook_ctx {
98 TAILQ_ENTRY(evrpc_hook_ctx) next;
99
100 void *ctx;
101 void (*cb)(void *, enum EVRPC_HOOK_RESULT);
102 };
103
104 struct evrpc_meta {
105 TAILQ_ENTRY(evrpc_meta) next;
106 char *key;
107
108 void *data;
109 size_t data_size;
110 };
111
112 TAILQ_HEAD(evrpc_meta_list, evrpc_meta);
113
114 struct evrpc_hook_meta {
115 struct evrpc_meta_list meta_data;
116 struct evhttp_connection *evcon;
117 };
118
119 /* allows association of meta data with a request */
120 static void evrpc_hook_associate_meta(struct evrpc_hook_meta **pctx,
121 struct evhttp_connection *evcon);
122
123 /* creates a new meta data store */
124 static struct evrpc_hook_meta *evrpc_hook_meta_new(void);
125
126 /* frees the meta data associated with a request */
127 static void evrpc_hook_context_free(struct evrpc_hook_meta *ctx);
128
129 /* the server side of an rpc */
130
131 /* We alias the RPC specific structs to this voided one */
132 struct evrpc_req_generic {
133 /*
134 * allows association of meta data via hooks - needs to be
135 * synchronized with evrpc_request_wrapper
136 */
137 struct evrpc_hook_meta *hook_meta;
138
139 /* the unmarshaled request object */
140 void *request;
141
142 /* the empty reply object that needs to be filled in */
143 void *reply;
144
145 /*
146 * the static structure for this rpc; that can be used to
147 * automatically unmarshal and marshal the http buffers.
148 */
149 struct evrpc *rpc;
150
151 /*
152 * the http request structure on which we need to answer.
153 */
154 struct evhttp_request* http_req;
155
156 /*
157 * Temporary data store for marshaled data
158 */
159 struct evbuffer* rpc_data;
160 };
161
162 /* the client side of an rpc request */
163 struct evrpc_request_wrapper {
164 /*
165 * allows association of meta data via hooks - needs to be
166 * synchronized with evrpc_req_generic.
167 */
168 struct evrpc_hook_meta *hook_meta;
169
170 TAILQ_ENTRY(evrpc_request_wrapper) next;
171
172 /* pool on which this rpc request is being made */
173 struct evrpc_pool *pool;
174
175 /* connection on which the request is being sent */
176 struct evhttp_connection *evcon;
177
178 /* the actual request */
179 struct evhttp_request *req;
180
181 /* event for implementing request timeouts */
182 struct event ev_timeout;
183
184 /* the name of the rpc */
185 char *name;
186
187 /* callback */
188 void (*cb)(struct evrpc_status*, void *request, void *reply, void *arg);
189 void *cb_arg;
190
191 void *request;
192 void *reply;
193
194 /* unmarshals the buffer into the proper request structure */
195 void (*request_marshal)(struct evbuffer *, void *);
196
197 /* removes all stored state in the reply */
198 void (*reply_clear)(void *);
199
200 /* marshals the reply into a buffer */
201 int (*reply_unmarshal)(void *, struct evbuffer*);
202 };
203
204 #endif /* _EVRPC_INTERNAL_H_ */
_evrpc_hooks
Definition: evrpc-internal.h:59
event
Structure to represent a single event.
Definition: event_struct.h:87
evrpc_request_wrapper
Definition: evrpc-internal.h:163
evrpc_hook
Definition: evrpc-internal.h:37
evrpc_base
Definition: evrpc-internal.h:71
evbuffer::TAILQ_HEAD
TAILQ_HEAD(evbuffer_cb_queue, evbuffer_cb_entry) callbacks
A doubly-linked-list of callback functions.
evbuffer
Definition: evbuffer-internal.h:78
evrpc_req_generic
Definition: evrpc-internal.h:132
evhttp_connection
Definition: http-internal.h:62
reply
Definition: evdns.c:185
evrpc_meta
Definition: evrpc-internal.h:104
evrpc_status
provides information about the completed RPC request.
Definition: rpc_struct.h:44
evrpc_hook_meta
Definition: evrpc-internal.h:114
request
Definition: evdns.c:158
evhttp
Definition: http-internal.h:136
evrpc
Definition: rpc_struct.h:59
event_base
Definition: event-internal.h:167
evrpc_hook_ctx
Definition: evrpc-internal.h:97
evhttp_request
the request structure that a server receives.
Definition: http_struct.h:57
evrpc_pool
Definition: evrpc-internal.h:85
EVRPC_HOOK_RESULT
EVRPC_HOOK_RESULT
Return value from hook processing functions.
Definition: rpc.h:470