summaryrefslogtreecommitdiffstats
path: root/CAN-binder/low-can-binding/binding/low-can-cb.cpp
blob: 55d9bdd4a3d32b580d335489521e3998d9b13387 (plain)
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
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
/*
 * 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 "low-can-hat.hpp"

#include <map>
#include <queue>
#include <mutex>
#include <vector>
#include <thread>
#include <json-c/json.h>
#include <systemd/sd-event.h>

#include "openxc.pb.h"
#include "configuration.hpp"
#include "../can/can-bus.hpp"
#include "../can/can-signals.hpp"
#include "../can/can-message.hpp"
#include "../utils/timer.hpp"
#include "../utils/signals.hpp"
#include "../diagnostic/diagnostic-message.hpp"
#include "../utils/openxc-utils.hpp"

extern "C"
{
	#include <afb/afb-service-itf.h>
};

void on_no_clients(std::string message)
{
	DiagnosticRequest* diag_req = configuration_t::instance().get_request_from_diagnostic_message(message);
	if(diag_req != nullptr)
	{
		active_diagnostic_request_t* adr = configuration_t::instance().get_diagnostic_manager().find_recurring_request(diag_req);
		if( adr != nullptr)
			configuration_t::instance().get_diagnostic_manager().cleanup_request(adr, true);
	}
}

int read(sd_event_source *s, int fd, uint32_t revents, void *userdata)
{
	can_signal_t* sig= (can_signal_t*)userdata;
	sig->read_socket();

	/* check if error or hangup */
	if ((revents & (EPOLLERR|EPOLLRDHUP|EPOLLHUP)) != 0)
	{
		sd_event_source_unref(s);
		sig->get_socket().close();
		sig->create_rx_filter();
	}
	return 0;
}

///******************************************************************************
///
///		Subscription and unsubscription
///
///*******************************************************************************/

static int make_subscription_unsubscription(struct afb_req request, const std::string& sig_name, std::map<std::string, struct afb_event>& s, bool subscribe)
{
	/* Make the subscription or unsubscription to the event */
	if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, s[sig_name])) < 0)
	{
		ERROR(binder_interface, "%s: Operation goes wrong for signal: %s", __FUNCTION__, sig_name.c_str());
		return 0;
	}
	return 1;
}

static int create_event_handle(const std::string& sig_name, std::map<std::string, struct afb_event>& s)
{
	s[sig_name] = afb_daemon_make_event(binder_interface->daemon, sig_name.c_str());
	if (!afb_event_is_valid(s[sig_name]))
	{
		ERROR(binder_interface, "%s: Can't create an event for %s, something goes wrong.", __FUNCTION__, sig_name.c_str());
		return 0;
	}
	return 1;
}

/// @brief Will determine if it is needed or not to create the event handle and checks it to be sure that
/// we got a valid afb_event to get subscribe or unsubscribe. Then launch the subscription or unsubscription
/// against the application framework using that event handle.
static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const std::string& sig)
{
	int ret;

	utils::signals_manager_t& sm = utils::signals_manager_t::instance();

	std::lock_guard<std::mutex> subscribed_signals_lock(sm.get_subscribed_signals_mutex());
	std::map<std::string, struct afb_event>& s = sm.get_subscribed_signals();
	if (s.find(sig) != s.end())
	{
		if (!afb_event_is_valid(s[sig]) && !subscribe)
		{
			NOTICE(binder_interface, "%s: Event isn't valid, no need to unsubscribed.", __FUNCTION__);
			ret = -1;
		}
		else
		{
			// Event it isn't valid annymore, recreate it
			ret = create_event_handle(sig, s);
		}
	}
	else
	{
		/* Event doesn't exist , so let's create it */
		struct afb_event empty_event = {nullptr, nullptr};
		s[sig] = empty_event;
		ret = create_event_handle(sig, s);
	}

	// Check whether or not the event handler has been correctly created and
	// make the subscription/unsubscription operation is so.
	if (ret <= 0)
		return ret;
	return make_subscription_unsubscription(request, sig, s, subscribe);
}

///
/// @brief subscribe to all signals in the vector signals
///
/// @param[in] afb_req request : contain original request use to subscribe or unsubscribe
/// @param[in] subscribe boolean value used to chose between a subscription operation or an unsubscription
/// @param[in] signals -  struct containing vectors with can_signal_t and diagnostic_messages to subscribe
///
/// @return Number of correctly subscribed signal
///
static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const struct utils::signals_found& signals)
{
	int ret,  rets = 0;

	//TODO: Implement way to dynamically call the right function no matter
	// how much signals types we have.
	configuration_t& conf = configuration_t::instance();

	for(const auto& sig : signals.diagnostic_messages)
	{
		diagnostic_manager_t& diag_m = conf.get_diagnostic_manager();
		DiagnosticRequest* diag_req = conf.get_request_from_diagnostic_message(sig->get_name());

		// If the requested diagnostic message isn't supported by the car then unsubcribe it
		// no matter what we want, worse case will be a fail unsubscription but at least we don't
		// poll a PID for nothing.
		if(sig->get_supported() && subscribe)
		{
				float frequency = sig->get_frequency();
				subscribe = diag_m.add_recurring_request(
					diag_req, sig->get_name().c_str(), false, sig->get_decoder(), sig->get_callback(), (float)frequency);
					//TODO: Adding callback requesting ignition status:	diag_req, sig.c_str(), false, diagnostic_message_t::decode_obd2_response, diagnostic_message_t::check_ignition_status, frequency);
		}
		else
		{
			diag_m.cleanup_request(
				diag_m.find_recurring_request(diag_req), true);
			WARNING(binder_interface, "%s: signal: %s isn't supported. Canceling operation.", __FUNCTION__, sig->get_name().c_str());
			return -1;
		}

		ret = subscribe_unsubscribe_signal(request, subscribe, sig->get_name());
		if(ret <= 0)
			return ret;
		rets++;
		DEBUG(binder_interface, "%s: Signal: %s subscribed", __FUNCTION__, sig->get_name().c_str());
	}

	for(const auto& sig: signals.can_signals)
	{
		if(sig->create_rx_filter() <= 0 && 
			subscribe_unsubscribe_signal(request, subscribe, sig->get_name()) <=0)
		{
			return -1;
		}
		struct sd_event_source* e_source;
		sd_event_add_io(afb_daemon_get_event_loop(binder_interface->daemon), &e_source, sig->get_socket().socket(), EPOLLIN, read, sig.get());
		rets++;
		DEBUG(binder_interface, "%s: signal: %s subscribed", __FUNCTION__, sig->get_name().c_str());
	}
	return rets;
}

static int process_args(struct afb_req request, const std::vector<std::string>& args, bool subscribe)
{
	struct utils::signals_found sf;
	int ok = 0, total = 0;

	for(const auto& sig: args)
	{
		openxc_DynamicField search_key = build_DynamicField(sig);
		sf = utils::signals_manager_t::instance().find_signals(search_key);
		total = (int)sf.can_signals.size() + (int)sf.diagnostic_messages.size();

		if (sf.can_signals.empty() && sf.diagnostic_messages.empty())
			NOTICE(binder_interface, "%s: No signal(s) found for %s.", __FUNCTION__, sig.c_str());
		else
			ok = subscribe_unsubscribe_signals(request, subscribe, sf);
	}
	NOTICE(binder_interface, "%s: Subscribed/unsubscribe correctly to %d/%d signal(s).", __FUNCTION__, ok, total);
	return ok;
}

static const std::vector<std::string> parse_args_from_request(struct afb_req request)
{
	int i, n;
	std::vector<std::string> ret;
	struct json_object *args, *a, *x;

	/* retrieve signals to subscribe */
	args = afb_req_json(request);
	if (args == NULL || !json_object_object_get_ex(args, "event", &a))
	{
		ret.push_back("*");
	}
	else if (json_object_get_type(a) != json_type_array)
	{
		ret.push_back(json_object_get_string(a));
	}
	else
	{
		n = json_object_array_length(a);
		for (i = 0 ; i < n ; i++)
		{
			x = json_object_array_get_idx(a, i);
			ret.push_back(json_object_get_string(x));
		}
	}

	return ret;
}

void subscribe(struct afb_req request)
{
	bool subscribe = true;

	const std::vector<std::string> args = parse_args_from_request(request);

	if (process_args(request, args, subscribe) > 0)
		afb_req_success(request, NULL, NULL);
	else
		afb_req_fail(request, "error", NULL);
}

void unsubscribe(struct afb_req request)
{
	std::vector<std::string> args;
	bool subscribe = false;
	
	args = parse_args_from_request(request);

	if (process_args(request, args, subscribe) > 0)
		afb_req_success(request, NULL, NULL);
	else
		afb_req_fail(request, "error", NULL);
}