aboutsummaryrefslogtreecommitdiffstats
path: root/src/StatsServer.cpp
blob: 558a479d042a8b7a73de7bd59be0c545fdee41b1 (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
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
/*
   Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
   Research Center Canada)

   Copyright (C) 2014 Matthias P. Braendli
   http://mpb.li

   A TCP Socket server that serves state information and statistics for
   monitoring purposes.

   This server is very easy to integrate with munin http://munin-monitoring.org/
   */
/*
   This file is part of ODR-DabMux.

   ODR-DabMux is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as
   published by the Free Software Foundation, either version 3 of the
   License, or (at your option) any later version.

   ODR-DabMux is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with ODR-DabMux.  If not, see <http://www.gnu.org/licenses/>.
   */

#include <errno.h>
#include <string.h>
#include <math.h>
#include <stdint.h>
#include <limits>
#include <sstream>
#include <ctime>
#include <boost/thread.hpp>
#include "StatsServer.h"
#include "Log.h"

void StatsServer::registerInput(InputStat* is)
{
    boost::mutex::scoped_lock lock(m_mutex);

    std::string id(is->get_name());

    if (m_inputStats.count(id) == 1) {
        etiLog.level(error) <<
            "Double registration in Stats Server with id '" <<
            id << "'";
        return;
    }

    m_inputStats[id] = is;
}

void StatsServer::unregisterInput(std::string id)
{
    boost::mutex::scoped_lock lock(m_mutex);

    if (m_inputStats.count(id) == 1) {
        m_inputStats.erase(id);
    }
}


bool StatsServer::isInputRegistered(std::string& id)
{
    boost::mutex::scoped_lock lock(m_mutex);

    if (m_inputStats.count(id) == 0) {
        etiLog.level(error) <<
            "Stats Server id '" <<
            id << "' does was not registered";
        return false;
    }
    return true;
}

std::string StatsServer::getConfigJSON()
{
    boost::mutex::scoped_lock lock(m_mutex);

    std::ostringstream ss;
    ss << "{ \"config\" : [\n";

    std::map<std::string,InputStat*>::iterator iter;
    int i = 0;
    for(iter = m_inputStats.begin(); iter != m_inputStats.end();
            ++iter, i++)
    {
        std::string id = iter->first;

        if (i > 0) {
            ss << ", ";
        }

        ss << " \"" << id << "\" ";
    }

    ss << "] }\n";

    return ss.str();
}

std::string StatsServer::getValuesJSON()
{
    boost::mutex::scoped_lock lock(m_mutex);

    std::ostringstream ss;
    ss << "{ \"values\" : {\n";

    std::map<std::string,InputStat*>::iterator iter;
    int i = 0;
    for(iter = m_inputStats.begin(); iter != m_inputStats.end();
            ++iter, i++)
    {
        const std::string& id = iter->first;
        InputStat* stats = iter->second;

        if (i > 0) {
            ss << " ,\n";
        }

        ss << " \"" << id << "\" : ";
        ss << stats->encodeValuesJSON();
        stats->reset();
    }

    ss << "}\n}\n";

    return ss.str();
}

std::string StatsServer::getStateJSON()
{
    boost::mutex::scoped_lock lock(m_mutex);

    std::ostringstream ss;
    ss << "{\n";

    std::map<std::string,InputStat*>::iterator iter;
    int i = 0;
    for(iter = m_inputStats.begin(); iter != m_inputStats.end();
            ++iter, i++)
    {
        const std::string& id = iter->first;
        InputStat* stats = iter->second;

        if (i > 0) {
            ss << " ,\n";
        }

        ss << " \"" << id << "\" : ";
        ss << stats->encodeStateJSON();
        stats->reset();
    }

    ss << "}\n";

    return ss.str();
}

void StatsServer::restart()
{
    m_restarter_thread = boost::thread(&StatsServer::restart_thread,
            this, 0);
}

// This runs in a separate thread, because
// it would take too long to be done in the main loop
// thread.
void StatsServer::restart_thread(long)
{
    m_running = false;

    if (m_listenport) {
        m_thread.interrupt();
        m_thread.join();
    }

    m_thread = boost::thread(&StatsServer::serverThread, this);
}

void StatsServer::serverThread()
{
    m_fault = false;

    try {
        int accepted_sock;
        char buffer[256];
        char welcome_msg[256];
        struct sockaddr_in serv_addr, cli_addr;
        int n;

        int welcome_msg_len = snprintf(welcome_msg, 256,
                "{ \"service\": \""
                "%s %s Stats Server\" }\n",
                PACKAGE_NAME,
#if defined(GITVERSION)
                GITVERSION
#else
                PACKAGE_VERSION
#endif
                );


        m_sock = socket(AF_INET, SOCK_STREAM, 0);
        if (m_sock < 0) {
            etiLog.level(error) << "Error opening Stats Server socket: " <<
                strerror(errno);
            m_fault = true;
            return;
        }

        memset(&serv_addr, 0, sizeof(serv_addr));
        serv_addr.sin_family = AF_INET;
        serv_addr.sin_addr.s_addr = INADDR_ANY; // TODO listen only on 127.0.0.1
        serv_addr.sin_port = htons(m_listenport);

        if (bind(m_sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
            etiLog.level(error) << "Error binding Stats Server socket: " <<
                strerror(errno);
            goto end_serverthread;
        }

        if (listen(m_sock, 5) < 0) {
            etiLog.level(error) << "Error listening on Stats Server socket: " <<
                strerror(errno);
            goto end_serverthread;
        }

        m_running = true;

        while (m_running) {
            socklen_t cli_addr_len = sizeof(cli_addr);

            /* Accept actual connection from the client */
            accepted_sock = accept(m_sock,
                    (struct sockaddr *)&cli_addr,
                    &cli_addr_len);

            if (accepted_sock < 0) {
                etiLog.level(warn) << "Stats Server cound not accept connection: " <<
                    strerror(errno);
                continue;
            }
            /* Send welcome message with version */
            n = write(accepted_sock, welcome_msg, welcome_msg_len);
            if (n < 0) {
                etiLog.level(warn) << "Error writing to Stats Server socket " <<
                    strerror(errno);
                close(accepted_sock);
                continue;
            }

            /* receive command */
            memset(buffer, 0, 256);
            int n = read(accepted_sock, buffer, 255);
            if (n < 0) {
                etiLog.level(warn) << "Error reading from Stats Server socket " <<
                    strerror(errno);
                close(accepted_sock);
                continue;
            }

            if (strcmp(buffer, "config\n") == 0) {
                std::string json = getConfigJSON();
                n = write(accepted_sock, json.c_str(), json.size());
            }
            else if (strcmp(buffer, "values\n") == 0) {
                std::string json = getValuesJSON();
                n = write(accepted_sock, json.c_str(), json.size());
            }
            else if (strcmp(buffer, "state\n") == 0) {
                std::string json = getStateJSON();
                n = write(accepted_sock, json.c_str(), json.size());
            }
            else {
                int len = snprintf(buffer, 256, "Invalid command\n");
                n = write(accepted_sock, buffer, len);
            }

            if (n < 0) {
                etiLog.level(warn) << "Error writing to Stats Server socket " <<
                    strerror(errno);
            }
            close(accepted_sock);
        }

end_serverthread:
        m_fault = true;
        close(m_sock);

    }
    catch (std::exception& e) {
        etiLog.level(error) << "Statistics server caught exception: " << e.what();
        m_fault = true;
    }
}

/************************************************/

void InputStat::registerAtServer()
{
    global_stats->registerInput(this);
}

InputStat::~InputStat()
{
    global_stats->unregisterInput(m_name);
}

std::string InputStat::encodeValuesJSON()
{
    std::ostringstream ss;

    const int16_t int16_max = std::numeric_limits<int16_t>::max();

    boost::mutex::scoped_lock lock(m_mutex);

    /* convert to dB */
    int dB_l = peak_left  ? round(20*log10((double)peak_left / int16_max))  : -90;
    int dB_r = peak_right ? round(20*log10((double)peak_right / int16_max)) : -90;

    ss <<
    "{ \"inputstat\" : {"
        "\"min_fill\": " << min_fill_buffer << ", "
        "\"max_fill\": " << max_fill_buffer << ", "
        "\"peak_left\": " << dB_l << ", "
        "\"peak_right\": " << dB_r << ", "
        "\"num_underruns\": " << num_underruns << ", "
        "\"num_overruns\": " << num_overruns <<
    " } }";

    return ss.str();
}

std::string InputStat::encodeStateJSON()
{
    std::ostringstream ss;

    ss << "{ \"state\" : ";

    switch (determineState()) {
        case NoData:
            ss << "\"NoData\"";
            break;
        case Unstable:
            ss << "\"Unstable\"";
            break;
        case Silence:
            ss << "\"Silent\"";
            break;
        case Streaming:
            ss << "\"Streaming\"";
            break;
        default:
            ss << "\"Unknown\"";
    }

    ss << " }";

    return ss.str();
}

input_state_t InputStat::determineState(void)
{
    boost::mutex::scoped_lock lock(m_mutex);

    time_t now = time(NULL);
    input_state_t state;

    /* if the last event was more that INPUT_COUNTER_RESET_TIME
     * minutes ago, the timeout has expired. We can reset our
     * glitch counter.
     */
    if (now - m_time_last_event > 60*INPUT_COUNTER_RESET_TIME) {
        m_glitch_counter = 0;
    }

    // STATE CALCULATION

    /* If the buffer has been empty for more than
     * INPUT_NODATA_TIMEOUT, we go to the NoData state.
     */
    if (m_buffer_empty &&
            now - m_time_last_buffer_nonempty > INPUT_NODATA_TIMEOUT) {
        state = NoData;
    }

    /* Otherwise, the state depends on the glitch counter */
    else if (m_glitch_counter >= INPUT_UNSTABLE_THRESHOLD) {
        state = Unstable;
    }
    else {
        /* The input is streaming, check if the audio level is too low */

        if (m_silence_counter > INPUT_AUDIO_LEVEL_SILENCE_COUNT) {
            state = Silence;
        }
        else {
            state = Streaming;
        }
    }

    return state;
}