summaryrefslogtreecommitdiffstats
path: root/src/ManagementServer.cpp
blob: 568e80ee9dec83e163c8555358d869c6d7d1939a (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
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
/*
   Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
   Research Center Canada)

   Copyright (C) 2018
   Matthias P. Braendli, matthias.braendli@mpb.li

    http://www.opendigitalradio.org

   A TCP Socket server that serves state information and statistics for
   monitoring purposes, and also serves the internal configuration
   property tree.
   */
/*
   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 <algorithm>
#include <boost/version.hpp>
#include "ManagementServer.h"
#include "Log.h"

using namespace std;

#define MIN_FILL_BUFFER_UNDEF (-1)

/* For silence detection, we count the number of occurrences the audio level
 * falls below a threshold.
 *
 * The counter is decreased for each frame that has good audio level.
 *
 * The counter saturates, and this value defines for how long the
 * input will be considered silent after a cut.
 *
 * If the count reaches a certain value, the input changes state
 * to Silence.  */
#define INPUT_AUDIO_LEVEL_THRESHOLD       -50  // dB
#define INPUT_AUDIO_LEVEL_SILENCE_COUNT    100 // superframes (120ms)
#define INPUT_AUDIO_LEVEL_COUNT_SATURATION 500 // superframes (120ms)

/* An example of how the state changes work.
 * The timeout is set to expire in 30 minutes
 * at each under-/overrun.
 *
 * The glitch counter is increased by one for each glitch (can be a
 * saturating counter), and set to zero when the counter timeout expires.
 *
 * The state is then simply depending on the glitch counter value.
 *
 * Graphical example:

 state     STREAMING      | UNSTABLE | STREAMING
 xruns         U     U    U
 glitch
  counter  0   1     2    3          0
 reset
  timeout  \   |\    |\   |\
            \  | \   | \  | \
             \ |  \  |  \ |  \
              \|   \ |   \|   \
               `    \|    `    \
                     `          \
                                 \
                                  \
                                   \
                                    \
  timeout expires ___________________\
                           <--30min-->
 */

/* The delay after which the glitch counter is reset */
static constexpr auto
INPUT_COUNTER_RESET_TIME = std::chrono::minutes(30);

/* How many glitches we tolerate in Streaming state before
 * we consider the input Unstable */
static constexpr int
INPUT_UNSTABLE_THRESHOLD = 3;

/* For how long the input buffers must be empty before we move an input to the
 * NoData state.  */
static constexpr auto
INPUT_NODATA_TIMEOUT  = std::chrono::seconds(30);

/* Keep 30s of min/max buffer fill information so that we can catch meaningful
 * values even if we have a slow poller */
static constexpr auto
BUFFER_STATS_KEEP_DURATION = std::chrono::seconds(30);

/* Audio level information changes faster than buffer levels, so it makes sense
 * to poll much faster. If we take the peak over too much data, we will hide
 * the interesting short-time fluctuations. At the same time, we want to have a
 * statistic that also catches the rare peaks, for slow pollers. */
static constexpr auto
PEAK_STATS_SHORT_WINDOW = std::chrono::milliseconds(500);
static constexpr auto
PEAK_STATS_KEEP_DURATION = std::chrono::minutes(5);

ManagementServer& get_mgmt_server()
{
    static ManagementServer mgmt_server;

    return mgmt_server;

    /* Warning, do not use the mgmt_server in the destructor
     * of another global object: you don't know which one
     * gets destroyed first
     */
}

void ManagementServer::registerInput(InputStat* is)
{
    unique_lock<mutex> lock(m_statsmutex);

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

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

    m_inputStats[id] = is;
}

void ManagementServer::unregisterInput(std::string id)
{
    unique_lock<mutex> lock(m_statsmutex);

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


bool ManagementServer::isInputRegistered(std::string& id)
{
    unique_lock<mutex> lock(m_statsmutex);

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

std::string ManagementServer::getStatConfigJSON()
{
    unique_lock<mutex> lock(m_statsmutex);

    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 ManagementServer::getValuesJSON()
{
    unique_lock<mutex> lock(m_statsmutex);

    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();
    }

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

    return ss.str();
}

ManagementServer::ManagementServer() :
    m_zmq_context(),
    m_zmq_sock(m_zmq_context, ZMQ_REP),
    m_running(false),
    m_fault(false)
{ }

ManagementServer::~ManagementServer()
{
    m_running = false;
    if (m_thread.joinable()) {
        m_thread.join();
        m_fault = false;
    }
}

void ManagementServer::open(int listenport)
{
    m_listenport = listenport;
    if (m_listenport > 0) {
        m_thread = std::thread(&ManagementServer::serverThread, this);
    }
}

void ManagementServer::restart()
{
    m_restarter_thread = thread(&ManagementServer::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 ManagementServer::restart_thread(long)
{
    m_running = false;

    if (m_thread.joinable()) {
        m_thread.join();
        m_fault = false;
    }

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

void ManagementServer::serverThread()
{
    m_running = true;
    m_fault = false;

    try {
        std::string bind_addr = "tcp://127.0.0.1:" + to_string(m_listenport);
        m_zmq_sock.bind(bind_addr.c_str());

        zmq::pollitem_t pollItems[] = { {m_zmq_sock, 0, ZMQ_POLLIN, 0} };

        while (m_running) {
            zmq::poll(pollItems, 1, 1000);

            if (pollItems[0].revents & ZMQ_POLLIN) {
                zmq::message_t zmq_message;
                const auto r = m_zmq_sock.recv(zmq_message);
                if (r.has_value()) {
                    handle_message(zmq_message);
                }
            }
        }
    }
    catch (const exception &e) {
        etiLog.level(error) << "Exception in ManagementServer: " <<
            e.what();
    }
    m_fault = true;
}

void ManagementServer::handle_message(zmq::message_t& zmq_message)
{
    std::stringstream answer;
    std::string data((char*)zmq_message.data(), zmq_message.size());

    try {
        if (data == "info") {

            answer <<
                "{ " <<
                "\"service\": \"" <<
                PACKAGE_NAME << " " <<
#if defined(GITVERSION)
                GITVERSION <<
#else
                PACKAGE_VERSION <<
#endif
                " MGMT Server\", "
                <<
                "\"version\": \"" <<
#if defined(GITVERSION)
                GITVERSION <<
#else
                PACKAGE_VERSION <<
#endif
                "\" "
                << "}\n";
        }
        else if (data == "config") {
            answer << getStatConfigJSON();
        }
        else if (data == "values") {
            answer << getValuesJSON();
        }
        else if (data == "getptree") {
            unique_lock<mutex> lock(m_configmutex);
            boost::property_tree::json_parser::write_json(answer, m_pt);
        }
        else {
            etiLog.level(warn) << "ManagementServer: Invalid request '" << data << "'";
            answer << "Invalid command";
        }

        std::string answerstr(answer.str());
        zmq::const_buffer message(answerstr.data(), answerstr.size());
        m_zmq_sock.send(message, zmq::send_flags::none);
    }
    catch (const std::exception& e) {
        etiLog.level(error) <<
            "MGMT server caught exception: " <<
            e.what();
    }
}

void ManagementServer::update_ptree(const boost::property_tree::ptree& pt)
{
    if (m_running) {
        unique_lock<mutex> lock(m_configmutex);
        m_pt = pt;
    }
}

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

InputStat::InputStat(const std::string& name) :
    m_name(name),
    m_time_last_event(std::chrono::steady_clock::now())
{
}

InputStat::~InputStat()
{
    get_mgmt_server().unregisterInput(m_name);
}

void InputStat::registerAtServer()
{
    get_mgmt_server().registerInput(this);
}

void InputStat::notifyBuffer(long bufsize)
{
    unique_lock<mutex> lock(m_mutex);

    using namespace std::chrono;
    const auto time_now = steady_clock::now();
    m_buffer_fill_stats.push_front({time_now, bufsize});

    prune_statistics(time_now);
}

void InputStat::notifyTimestampOffset(double offset)
{
    unique_lock<mutex> lock(m_mutex);

    m_last_tist_offset = offset;
}

void InputStat::notifyPeakLevels(int peak_left, int peak_right)
{
    unique_lock<mutex> lock(m_mutex);

    using namespace std::chrono;
    const auto time_now = steady_clock::now();
    m_peak_stats.push_front({time_now, peak_left, peak_right});

    prune_statistics(time_now);

    if (m_peak_stats.size() >= 2) {
        // Calculate the peak over the short window
        vector<peak_stat_t> short_peaks;
        copy_if(m_peak_stats.begin(), m_peak_stats.end(),
                back_inserter(short_peaks),
                [&](const peak_stat_t& ps) {
                    return ps.timestamp + PEAK_STATS_SHORT_WINDOW >= time_now;
                });

        const auto& short_left_peak_max = max_element(
                short_peaks.begin(), short_peaks.end(),
                [](const peak_stat_t& lhs, const peak_stat_t& rhs) {
                    return lhs.peak_left < rhs.peak_left;
                });

        const auto& short_right_peak_max = max_element(
                short_peaks.begin(), short_peaks.end(),
                [](const peak_stat_t& lhs, const peak_stat_t& rhs) {
                    return lhs.peak_right < rhs.peak_right;
                });

        // Using the lower of the two channels allows us to detect if only one
        // channel is silent.
        const int lower_peak = min(
                short_left_peak_max->peak_left, short_right_peak_max->peak_right);

        // State
        const int16_t int16_max = std::numeric_limits<int16_t>::max();
        int peak_dB = lower_peak ?
            round(20*log10((double)lower_peak / int16_max)) :
            -90;

        if (peak_dB < INPUT_AUDIO_LEVEL_THRESHOLD) {
            if (m_silence_counter < INPUT_AUDIO_LEVEL_COUNT_SATURATION) {
                m_silence_counter++;
            }
        }
        else {
            if (m_silence_counter > 0) {
                m_silence_counter--;
            }
        }
    }
}

void InputStat::notifyUnderrun(void)
{
    unique_lock<mutex> lock(m_mutex);

    // Statistics
    m_num_underruns++;

    // State
    m_time_last_event = std::chrono::steady_clock::now();
    if (m_glitch_counter < INPUT_UNSTABLE_THRESHOLD) {
        m_glitch_counter++;
    }
    else {
        // As we don't receive level notifications anymore, clear the
        // audio level information
        m_peak_stats.clear();
    }
}

void InputStat::notifyOverrun(void)
{
    unique_lock<mutex> lock(m_mutex);

    // Statistics
    m_num_overruns++;

    // State
    m_time_last_event = std::chrono::steady_clock::now();
    if (m_glitch_counter < INPUT_UNSTABLE_THRESHOLD) {
        m_glitch_counter++;
    }
}

void InputStat::notifyVersion(const std::string& version, uint32_t uptime_s)
{
    unique_lock<mutex> lock(m_mutex);

    m_version = version;
    m_uptime_s = uptime_s;
}

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

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

    unique_lock<mutex> lock(m_mutex);

    int peak_left_short = 0;
    int peak_right_short = 0;
    int peak_left = 0;
    int peak_right = 0;

    if (not m_peak_stats.empty()) {
        peak_left = max_element(m_peak_stats.begin(), m_peak_stats.end(),
                [](const peak_stat_t& lhs, const peak_stat_t& rhs) {
                    return lhs.peak_left < rhs.peak_left;
                })->peak_left;
        peak_right = max_element(m_peak_stats.begin(), m_peak_stats.end(),
                [](const peak_stat_t& lhs, const peak_stat_t& rhs) {
                    return lhs.peak_right < rhs.peak_right;
                })->peak_right;

        if (m_peak_stats.size() > m_short_window_length) {
            peak_left_short = max_element(m_peak_stats.begin(),
                    m_peak_stats.begin() + m_short_window_length,
                [](const peak_stat_t& lhs, const peak_stat_t& rhs) {
                    return lhs.peak_left < rhs.peak_left;
                })->peak_left;

            peak_right_short = max_element(m_peak_stats.begin(),
                    m_peak_stats.begin() + m_short_window_length,
                [](const peak_stat_t& lhs, const peak_stat_t& rhs) {
                    return lhs.peak_right < rhs.peak_right;
                })->peak_right;
        }
        else {
            peak_left_short = peak_left;
            peak_right_short = peak_right;
        }
    }

    long min_fill_buffer = MIN_FILL_BUFFER_UNDEF;
    long max_fill_buffer = 0;
    if (not m_buffer_fill_stats.empty()) {
        const auto& buffer_min_max_fill = minmax_element(
                m_buffer_fill_stats.begin(), m_buffer_fill_stats.end(),
                [](const fill_stat_t& lhs, const fill_stat_t& rhs) {
                    return lhs.bufsize < rhs.bufsize;
                });
        min_fill_buffer = buffer_min_max_fill.first->bufsize;
        max_fill_buffer = buffer_min_max_fill.second->bufsize;
    }

    /* convert to dB */
    auto to_dB = [](int p) {
        int dB = -90;
        if (p) {
            dB = round(20*log10((double)p / int16_max));
        }
        return dB;
    };

    auto version = m_version;
    size_t pos = 0;
    while ((pos = version.find("\"", pos)) != std::string::npos) {
         version.replace(pos, 1, "\\\"");
         pos++;
    }

    ss <<
    "{ \"inputstat\" : {"
        "\"min_fill\": " << min_fill_buffer << ", "
        "\"max_fill\": " << max_fill_buffer << ", "
        "\"peak_left\": " << to_dB(peak_left_short) << ", "
        "\"peak_right\": " << to_dB(peak_right_short) << ", "
        "\"peak_left_slow\": " << to_dB(peak_left) << ", "
        "\"peak_right_slow\": " << to_dB(peak_right) << ", "
        "\"num_underruns\": " << m_num_underruns << ", "
        "\"num_overruns\": " << m_num_overruns << ", "
        "\"last_tist_offset\": " << m_last_tist_offset << ", "
        "\"version\": \"" << version << "\", "
        "\"uptime\": " << m_uptime_s << ", "
        ;

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

    switch (determineState()) {
        case input_state_t::NoData:
            ss << "\"NoData (1)\"";
            break;
        case input_state_t::Unstable:
            ss << "\"Unstable (2)\"";
            break;
        case input_state_t::Silence:
            ss << "\"Silent (3)\"";
            break;
        case input_state_t::Streaming:
            ss << "\"Streaming (4)\"";
            break;
    }

    ss << " } }";

    return ss.str();
}

input_state_t InputStat::determineState()
{
    const auto now = std::chrono::steady_clock::now();
    prune_statistics(now);

    input_state_t state;

    /* if the last event was more that INPUT_COUNTER_RESET_TIME
     * ago, the timeout has expired. We can reset our
     * glitch counter.
     */
    if (now - m_time_last_event > 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.
     *
     * Consider an empty deque to be NoData too.
     */
    if (std::all_of(
                m_buffer_fill_stats.begin(), m_buffer_fill_stats.end(),
                [](const fill_stat_t& fs) { return fs.bufsize == 0; }) ) {
        state = input_state_t::NoData;
    }
    /* Otherwise, the state depends on the glitch counter */
    else if (m_glitch_counter >= INPUT_UNSTABLE_THRESHOLD) {
        state = input_state_t::Unstable;
    }
    else {
        /* The input is streaming, check if the audio level is too low */

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

    return state;
}

void InputStat::prune_statistics(const std::chrono::time_point<std::chrono::steady_clock>& time_now)
{
    // Keep only stats whose timestamp are more recent than
    // BUFFER_STATS_KEEP_DURATION ago
    m_buffer_fill_stats.erase(remove_if(
                m_buffer_fill_stats.begin(), m_buffer_fill_stats.end(),
                [&](const fill_stat_t& fs) {
                    return fs.timestamp + BUFFER_STATS_KEEP_DURATION < time_now;
                }),
                m_buffer_fill_stats.end());

    // Keep only stats whose timestamp are more recent than
    // BUFFER_STATS_KEEP_DURATION ago
    m_peak_stats.erase(remove_if(
                m_peak_stats.begin(), m_peak_stats.end(),
                [&](const peak_stat_t& ps) {
                    return ps.timestamp + PEAK_STATS_KEEP_DURATION < time_now;
                }),
                m_peak_stats.end());
}