1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* 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 "event2/http.h"
#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_ */
|
