aboutsummaryrefslogtreecommitdiff
path: root/src/logging.cpp
blob: a9fea433be42eb402b3b251ee6a92cd843787a84 (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
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <logging.h>
#include <util/fs.h>
#include <util/string.h>
#include <util/threadnames.h>
#include <util/time.h>

#include <array>
#include <map>
#include <optional>

using util::Join;
using util::RemovePrefix;
using util::ToString;

const char * const DEFAULT_DEBUGLOGFILE = "debug.log";
constexpr auto MAX_USER_SETABLE_SEVERITY_LEVEL{BCLog::Level::Info};

BCLog::Logger& LogInstance()
{
/**
 * NOTE: the logger instances is leaked on exit. This is ugly, but will be
 * cleaned up by the OS/libc. Defining a logger as a global object doesn't work
 * since the order of destruction of static/global objects is undefined.
 * Consider if the logger gets destroyed, and then some later destructor calls
 * LogPrintf, maybe indirectly, and you get a core dump at shutdown trying to
 * access the logger. When the shutdown sequence is fully audited and tested,
 * explicit destruction of these objects can be implemented by changing this
 * from a raw pointer to a std::unique_ptr.
 * Since the ~Logger() destructor is never called, the Logger class and all
 * its subclasses must have implicitly-defined destructors.
 *
 * This method of initialization was originally introduced in
 * ee3374234c60aba2cc4c5cd5cac1c0aefc2d817c.
 */
    static BCLog::Logger* g_logger{new BCLog::Logger()};
    return *g_logger;
}

bool fLogIPs = DEFAULT_LOGIPS;

static int FileWriteStr(const std::string &str, FILE *fp)
{
    return fwrite(str.data(), 1, str.size(), fp);
}

bool BCLog::Logger::StartLogging()
{
    StdLockGuard scoped_lock(m_cs);

    assert(m_buffering);
    assert(m_fileout == nullptr);

    if (m_print_to_file) {
        assert(!m_file_path.empty());
        m_fileout = fsbridge::fopen(m_file_path, "a");
        if (!m_fileout) {
            return false;
        }

        setbuf(m_fileout, nullptr); // unbuffered

        // Add newlines to the logfile to distinguish this execution from the
        // last one.
        FileWriteStr("\n\n\n\n\n", m_fileout);
    }

    // dump buffered messages from before we opened the log
    m_buffering = false;
    while (!m_msgs_before_open.empty()) {
        const std::string& s = m_msgs_before_open.front();

        if (m_print_to_file) FileWriteStr(s, m_fileout);
        if (m_print_to_console) fwrite(s.data(), 1, s.size(), stdout);
        for (const auto& cb : m_print_callbacks) {
            cb(s);
        }

        m_msgs_before_open.pop_front();
    }
    if (m_print_to_console) fflush(stdout);

    return true;
}

void BCLog::Logger::DisconnectTestLogger()
{
    StdLockGuard scoped_lock(m_cs);
    m_buffering = true;
    if (m_fileout != nullptr) fclose(m_fileout);
    m_fileout = nullptr;
    m_print_callbacks.clear();
}

void BCLog::Logger::EnableCategory(BCLog::LogFlags flag)
{
    m_categories |= flag;
}

bool BCLog::Logger::EnableCategory(const std::string& str)
{
    BCLog::LogFlags flag;
    if (!GetLogCategory(flag, str)) return false;
    EnableCategory(flag);
    return true;
}

void BCLog::Logger::DisableCategory(BCLog::LogFlags flag)
{
    m_categories &= ~flag;
}

bool BCLog::Logger::DisableCategory(const std::string& str)
{
    BCLog::LogFlags flag;
    if (!GetLogCategory(flag, str)) return false;
    DisableCategory(flag);
    return true;
}

bool BCLog::Logger::WillLogCategory(BCLog::LogFlags category) const
{
    return (m_categories.load(std::memory_order_relaxed) & category) != 0;
}

bool BCLog::Logger::WillLogCategoryLevel(BCLog::LogFlags category, BCLog::Level level) const
{
    // Log messages at Info, Warning and Error level unconditionally, so that
    // important troubleshooting information doesn't get lost.
    if (level >= BCLog::Level::Info) return true;

    if (!WillLogCategory(category)) return false;

    StdLockGuard scoped_lock(m_cs);
    const auto it{m_category_log_levels.find(category)};
    return level >= (it == m_category_log_levels.end() ? LogLevel() : it->second);
}

bool BCLog::Logger::DefaultShrinkDebugFile() const
{
    return m_categories == BCLog::NONE;
}

static const std::map<std::string, BCLog::LogFlags> LOG_CATEGORIES_BY_STR{
    {"0", BCLog::NONE},
    {"", BCLog::NONE},
    {"net", BCLog::NET},
    {"tor", BCLog::TOR},
    {"mempool", BCLog::MEMPOOL},
    {"http", BCLog::HTTP},
    {"bench", BCLog::BENCH},
    {"zmq", BCLog::ZMQ},
    {"walletdb", BCLog::WALLETDB},
    {"rpc", BCLog::RPC},
    {"estimatefee", BCLog::ESTIMATEFEE},
    {"addrman", BCLog::ADDRMAN},
    {"selectcoins", BCLog::SELECTCOINS},
    {"reindex", BCLog::REINDEX},
    {"cmpctblock", BCLog::CMPCTBLOCK},
    {"rand", BCLog::RAND},
    {"prune", BCLog::PRUNE},
    {"proxy", BCLog::PROXY},
    {"mempoolrej", BCLog::MEMPOOLREJ},
    {"libevent", BCLog::LIBEVENT},
    {"coindb", BCLog::COINDB},
    {"qt", BCLog::QT},
    {"leveldb", BCLog::LEVELDB},
    {"validation", BCLog::VALIDATION},
    {"i2p", BCLog::I2P},
    {"ipc", BCLog::IPC},
#ifdef DEBUG_LOCKCONTENTION
    {"lock", BCLog::LOCK},
#endif
    {"blockstorage", BCLog::BLOCKSTORAGE},
    {"txreconciliation", BCLog::TXRECONCILIATION},
    {"scan", BCLog::SCAN},
    {"txpackages", BCLog::TXPACKAGES},
    {"1", BCLog::ALL},
    {"all", BCLog::ALL},
};

static const std::unordered_map<BCLog::LogFlags, std::string> LOG_CATEGORIES_BY_FLAG{
    // Swap keys and values from LOG_CATEGORIES_BY_STR.
    [](const std::map<std::string, BCLog::LogFlags>& in) {
        std::unordered_map<BCLog::LogFlags, std::string> out;
        for (const auto& [k, v] : in) {
            switch (v) {
            case BCLog::NONE: out.emplace(BCLog::NONE, ""); break;
            case BCLog::ALL: out.emplace(BCLog::ALL, "all"); break;
            default: out.emplace(v, k);
            }
        }
        return out;
    }(LOG_CATEGORIES_BY_STR)
};

bool GetLogCategory(BCLog::LogFlags& flag, const std::string& str)
{
    if (str.empty()) {
        flag = BCLog::ALL;
        return true;
    }
    auto it = LOG_CATEGORIES_BY_STR.find(str);
    if (it != LOG_CATEGORIES_BY_STR.end()) {
        flag = it->second;
        return true;
    }
    return false;
}

std::string BCLog::Logger::LogLevelToStr(BCLog::Level level)
{
    switch (level) {
    case BCLog::Level::Trace:
        return "trace";
    case BCLog::Level::Debug:
        return "debug";
    case BCLog::Level::Info:
        return "info";
    case BCLog::Level::Warning:
        return "warning";
    case BCLog::Level::Error:
        return "error";
    }
    assert(false);
}

std::string LogCategoryToStr(BCLog::LogFlags category)
{
    auto it = LOG_CATEGORIES_BY_FLAG.find(category);
    assert(it != LOG_CATEGORIES_BY_FLAG.end());
    return it->second;
}

static std::optional<BCLog::Level> GetLogLevel(const std::string& level_str)
{
    if (level_str == "trace") {
        return BCLog::Level::Trace;
    } else if (level_str == "debug") {
        return BCLog::Level::Debug;
    } else if (level_str == "info") {
        return BCLog::Level::Info;
    } else if (level_str == "warning") {
        return BCLog::Level::Warning;
    } else if (level_str == "error") {
        return BCLog::Level::Error;
    } else {
        return std::nullopt;
    }
}

std::vector<LogCategory> BCLog::Logger::LogCategoriesList() const
{
    std::vector<LogCategory> ret;
    for (const auto& [category, flag] : LOG_CATEGORIES_BY_STR) {
        if (flag != BCLog::NONE && flag != BCLog::ALL) {
            ret.push_back(LogCategory{.category = category, .active = WillLogCategory(flag)});
        }
    }
    return ret;
}

/** Log severity levels that can be selected by the user. */
static constexpr std::array<BCLog::Level, 3> LogLevelsList()
{
    return {BCLog::Level::Info, BCLog::Level::Debug, BCLog::Level::Trace};
}

std::string BCLog::Logger::LogLevelsString() const
{
    const auto& levels = LogLevelsList();
    return Join(std::vector<BCLog::Level>{levels.begin(), levels.end()}, ", ", [](BCLog::Level level) { return LogLevelToStr(level); });
}

std::string BCLog::Logger::LogTimestampStr(const std::string& str)
{
    std::string strStamped;

    if (!m_log_timestamps)
        return str;

    if (m_started_new_line) {
        const auto now{SystemClock::now()};
        const auto now_seconds{std::chrono::time_point_cast<std::chrono::seconds>(now)};
        strStamped = FormatISO8601DateTime(TicksSinceEpoch<std::chrono::seconds>(now_seconds));
        if (m_log_time_micros && !strStamped.empty()) {
            strStamped.pop_back();
            strStamped += strprintf(".%06dZ", Ticks<std::chrono::microseconds>(now - now_seconds));
        }
        std::chrono::seconds mocktime = GetMockTime();
        if (mocktime > 0s) {
            strStamped += " (mocktime: " + FormatISO8601DateTime(count_seconds(mocktime)) + ")";
        }
        strStamped += ' ' + str;
    } else
        strStamped = str;

    return strStamped;
}

namespace BCLog {
    /** Belts and suspenders: make sure outgoing log messages don't contain
     * potentially suspicious characters, such as terminal control codes.
     *
     * This escapes control characters except newline ('\n') in C syntax.
     * It escapes instead of removes them to still allow for troubleshooting
     * issues where they accidentally end up in strings.
     */
    std::string LogEscapeMessage(const std::string& str) {
        std::string ret;
        for (char ch_in : str) {
            uint8_t ch = (uint8_t)ch_in;
            if ((ch >= 32 || ch == '\n') && ch != '\x7f') {
                ret += ch_in;
            } else {
                ret += strprintf("\\x%02x", ch);
            }
        }
        return ret;
    }
} // namespace BCLog

std::string BCLog::Logger::GetLogPrefix(BCLog::LogFlags category, BCLog::Level level) const
{
    if (category == LogFlags::NONE) category = LogFlags::ALL;

    const bool has_category{m_always_print_category_level || category != LogFlags::ALL};

    // If there is no category, Info is implied
    if (!has_category && level == Level::Info) return {};

    std::string s{"["};
    if (has_category) {
        s += LogCategoryToStr(category);
    }

    if (m_always_print_category_level || !has_category || level != Level::Debug) {
        // If there is a category, Debug is implied, so don't add the level

        // Only add separator if we have a category
        if (has_category) s += ":";
        s += Logger::LogLevelToStr(level);
    }

    s += "] ";
    return s;
}

void BCLog::Logger::LogPrintStr(const std::string& str, const std::string& logging_function, const std::string& source_file, int source_line, BCLog::LogFlags category, BCLog::Level level)
{
    StdLockGuard scoped_lock(m_cs);
    std::string str_prefixed = LogEscapeMessage(str);

    if (m_started_new_line) {
        str_prefixed.insert(0, GetLogPrefix(category, level));
    }

    if (m_log_sourcelocations && m_started_new_line) {
        str_prefixed.insert(0, "[" + RemovePrefix(source_file, "./") + ":" + ToString(source_line) + "] [" + logging_function + "] ");
    }

    if (m_log_threadnames && m_started_new_line) {
        const auto& threadname = util::ThreadGetInternalName();
        str_prefixed.insert(0, "[" + (threadname.empty() ? "unknown" : threadname) + "] ");
    }

    str_prefixed = LogTimestampStr(str_prefixed);

    m_started_new_line = !str.empty() && str[str.size()-1] == '\n';

    if (m_buffering) {
        // buffer if we haven't started logging yet
        m_msgs_before_open.push_back(str_prefixed);
        return;
    }

    if (m_print_to_console) {
        // print to console
        fwrite(str_prefixed.data(), 1, str_prefixed.size(), stdout);
        fflush(stdout);
    }
    for (const auto& cb : m_print_callbacks) {
        cb(str_prefixed);
    }
    if (m_print_to_file) {
        assert(m_fileout != nullptr);

        // reopen the log file, if requested
        if (m_reopen_file) {
            m_reopen_file = false;
            FILE* new_fileout = fsbridge::fopen(m_file_path, "a");
            if (new_fileout) {
                setbuf(new_fileout, nullptr); // unbuffered
                fclose(m_fileout);
                m_fileout = new_fileout;
            }
        }
        FileWriteStr(str_prefixed, m_fileout);
    }
}

void BCLog::Logger::ShrinkDebugFile()
{
    // Amount of debug.log to save at end when shrinking (must fit in memory)
    constexpr size_t RECENT_DEBUG_HISTORY_SIZE = 10 * 1000000;

    assert(!m_file_path.empty());

    // Scroll debug.log if it's getting too big
    FILE* file = fsbridge::fopen(m_file_path, "r");

    // Special files (e.g. device nodes) may not have a size.
    size_t log_size = 0;
    try {
        log_size = fs::file_size(m_file_path);
    } catch (const fs::filesystem_error&) {}

    // If debug.log file is more than 10% bigger the RECENT_DEBUG_HISTORY_SIZE
    // trim it down by saving only the last RECENT_DEBUG_HISTORY_SIZE bytes
    if (file && log_size > 11 * (RECENT_DEBUG_HISTORY_SIZE / 10))
    {
        // Restart the file with some of the end
        std::vector<char> vch(RECENT_DEBUG_HISTORY_SIZE, 0);
        if (fseek(file, -((long)vch.size()), SEEK_END)) {
            LogPrintf("Failed to shrink debug log file: fseek(...) failed\n");
            fclose(file);
            return;
        }
        int nBytes = fread(vch.data(), 1, vch.size(), file);
        fclose(file);

        file = fsbridge::fopen(m_file_path, "w");
        if (file)
        {
            fwrite(vch.data(), 1, nBytes, file);
            fclose(file);
        }
    }
    else if (file != nullptr)
        fclose(file);
}

bool BCLog::Logger::SetLogLevel(const std::string& level_str)
{
    const auto level = GetLogLevel(level_str);
    if (!level.has_value() || level.value() > MAX_USER_SETABLE_SEVERITY_LEVEL) return false;
    m_log_level = level.value();
    return true;
}

bool BCLog::Logger::SetCategoryLogLevel(const std::string& category_str, const std::string& level_str)
{
    BCLog::LogFlags flag;
    if (!GetLogCategory(flag, category_str)) return false;

    const auto level = GetLogLevel(level_str);
    if (!level.has_value() || level.value() > MAX_USER_SETABLE_SEVERITY_LEVEL) return false;

    StdLockGuard scoped_lock(m_cs);
    m_category_log_levels[flag] = level.value();
    return true;
}