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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* Copyright (C) 2015, 2016 "IoT.bzh"
* Author "Romain Forlot" <romain.forlot@iot.bzh>
* Author "Loic Collignon" <loic.collignon@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <json-c/json.h>
#include <systemd/sd-event.h>
#include "low-can-binding.hpp"
#include "can-utils.hpp"
#include "can-signals.hpp"
#include "openxc-utils.hpp"
extern "C"
{
#include <afb/afb-binding.h>
#include <afb/afb-service-itf.h>
};
/*
* Interface between the daemon and the binding
*/
const struct afb_binding_interface *binder_interface;
/********************************************************************************
*
* Event management
*
*********************************************************************************/
/********************************************************************************
*
* Subscription and unsubscription
*
*********************************************************************************/
static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const CanSignal& sig)
{
int ret;
// TODO: lock the subscribed_signals when insert/remove
const auto& ss_i = subscribed_signals.find(sig.genericName);
if (ss_i != subscribed_signals.end())
{
if(!afb_event_is_valid(ss_i->second))
{
if(!subscribe)
{
NOTICE(binder_interface, "Event isn't valid, it can't be unsubscribed.");
ret = 1;
}
else
{
ss_i->second = afb_daemon_make_event(binder_interface->daemon, ss_i->first.c_str());
if (!afb_event_is_valid(ss_i->second))
{
ERROR(binder_interface, "Can't create an event, something goes wrong.");
ret = 0;
}
}
}
}
else
{
subscribed_signals[sig.genericName] = afb_daemon_make_event(binder_interface->daemon, sig.genericName);
if (!afb_event_is_valid(ss_i->second))
{
ERROR(binder_interface, "Can't create an event, something goes wrong.");
ret = 0;
}
}
if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, subscribed_signals[sig.genericName])) < 0)
{
ERROR(binder_interface, "Operation goes wrong for signal: %s", sig.genericName);
ret = 0;
}
else
ret = 1;
return ret;
}
static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const std::vector<CanSignal>& signals)
{
int ret = 0;
for(const auto& signal_i : signals)
{
ret = subscribe_unsubscribe_signal(request, subscribe, signal_i);
if(ret == 0)
return ret;
}
return ret;
}
static int subscribe_unsubscribe_all(struct afb_req request, bool subscribe)
{
int e = 0;
//for (const auto& sig : SIGNALS)
// e += !subscribe_unsubscribe_signals(request, subscribe, sig);
e += !subscribe_unsubscribe_signals(request, subscribe, getSignals());
return e == 0;
}
static int subscribe_unsubscribe_name(struct afb_req request, bool subscribe, const char *name)
{
std::vector<CanSignal> sig;
int ret = 0;
if (!::strcmp(name, "*"))
ret = subscribe_unsubscribe_all(request, subscribe);
else
{
//if(obd2_handler_c.is_obd2_signal(name))
if(false)
{
// TODO
}
else
{
openxc_DynamicField search_key = build_DynamicField(name);
sig = find_can_signals(binder_interface, search_key);
if (sig.empty())
ret = 0;
}
ret = subscribe_unsubscribe_signals(request, subscribe, sig);
}
return ret;
}
static void subscribe_unsubscribe(struct afb_req request, bool subscribe)
{
int ok, i, n;
struct json_object *args, *a, *x;
/* makes the subscription/unsubscription */
args = afb_req_json(request);
if (args == NULL || !json_object_object_get_ex(args, "event", &a)) {
ok = subscribe_unsubscribe_all(request, subscribe);
} else if (json_object_get_type(a) != json_type_array) {
ok = subscribe_unsubscribe_name(request, subscribe, json_object_get_string(a));
} else {
n = json_object_array_length(a);
ok = 0;
for (i = 0 ; i < n ; i++) {
x = json_object_array_get_idx(a, i);
if (subscribe_unsubscribe_name(request, subscribe, json_object_get_string(x)))
ok++;
}
ok = (ok == n);
}
/* send the report */
if (ok)
afb_req_success(request, NULL, NULL);
else
afb_req_fail(request, "error", NULL);
}
extern "C"
{
static void subscribe(struct afb_req request)
{
subscribe_unsubscribe(request, true);
}
static void unsubscribe(struct afb_req request)
{
subscribe_unsubscribe(request, false);
}
static const struct afb_verb_desc_v1 verbs[]=
{
{ .name= "subscribe", .session= AFB_SESSION_NONE, .callback= subscribe, .info= "subscribe to notification of CAN bus messages." },
{ .name= "unsubscribe", .session= AFB_SESSION_NONE, .callback= unsubscribe, .info= "unsubscribe a previous subscription." }
};
static const struct afb_binding binding_desc {
AFB_BINDING_VERSION_1,
{
"CAN bus service",
"can",
verbs
}
};
const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
{
binder_interface = itf;
return &binding_desc;
}
/**
* @brief Initialize the binding.
*
* @param[in] service Structure which represent the Application Framework Binder.
*
* @return Exit code, zero if success.
*/
int afbBindingV1ServiceInit(struct afb_service service)
{
int fd_conf;
fd_conf = afb_daemon_rootdir_open_locale(binder_interface->daemon, "can_bus.json", O_RDONLY, NULL);
/* Open CAN socket */
can_bus_t can_bus_handler(binder_interface, fd_conf);
if(can_bus_handler.init_can_dev() == 0)
{
can_bus_handler.start_threads();
return 0;
}
return 1;
}
};
|
