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logging.cpp
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logging.cpp
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Copyright (c) 2017-2018 The Bitcoin 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.h>
#include <utiltime.h>
bool fLogIPs = DEFAULT_LOGIPS;
const char *const DEFAULT_DEBUGLOGFILE = "debug.log";
/**
* NOTE: the logger instance 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.
*
* This method of initialization was originally introduced in
* ee3374234c60aba2cc4c5cd5cac1c0aefc2d817c.
*/
BCLog::Logger &GetLogger() {
static BCLog::Logger *const logger = new BCLog::Logger();
return *logger;
}
static int FileWriteStr(const std::string &str, FILE *fp) {
return fwrite(str.data(), 1, str.size(), fp);
}
fs::path BCLog::Logger::GetDebugLogPath() {
fs::path logfile(gArgs.GetArg("-debuglogfile", DEFAULT_DEBUGLOGFILE));
if (logfile.is_absolute()) {
return logfile;
} else {
return GetDataDir() / logfile;
}
}
bool BCLog::Logger::OpenDebugLog() {
std::lock_guard<std::mutex> scoped_lock(m_file_mutex);
assert(m_fileout == nullptr);
fs::path pathDebug = GetDebugLogPath();
m_fileout = fsbridge::fopen(pathDebug, "a");
if (!m_fileout) {
return false;
}
// Unbuffered.
setbuf(m_fileout, nullptr);
// Dump buffered messages from before we opened the log.
while (!m_msgs_before_open.empty()) {
FileWriteStr(m_msgs_before_open.front(), m_fileout);
m_msgs_before_open.pop_front();
}
return true;
}
struct CLogCategoryDesc {
BCLog::LogFlags flag;
std::string category;
};
const CLogCategoryDesc LogCategories[] = {
{BCLog::NONE, "0"},
{BCLog::NONE, "none"},
{BCLog::NET, "net"},
{BCLog::TOR, "tor"},
{BCLog::MEMPOOL, "mempool"},
{BCLog::HTTP, "http"},
{BCLog::BENCH, "bench"},
{BCLog::ZMQ, "zmq"},
{BCLog::DB, "db"},
{BCLog::RPC, "rpc"},
{BCLog::ESTIMATEFEE, "estimatefee"},
{BCLog::ADDRMAN, "addrman"},
{BCLog::SELECTCOINS, "selectcoins"},
{BCLog::REINDEX, "reindex"},
{BCLog::CMPCTBLOCK, "cmpctblock"},
{BCLog::RAND, "rand"},
{BCLog::PRUNE, "prune"},
{BCLog::PROXY, "proxy"},
{BCLog::MEMPOOLREJ, "mempoolrej"},
{BCLog::LIBEVENT, "libevent"},
{BCLog::COINDB, "coindb"},
{BCLog::QT, "qt"},
{BCLog::LEVELDB, "leveldb"},
{BCLog::ALL, "1"},
{BCLog::ALL, "all"},
};
bool GetLogCategory(BCLog::LogFlags &flag, const std::string &str) {
if (str == "") {
flag = BCLog::ALL;
return true;
}
for (const CLogCategoryDesc &category_desc : LogCategories) {
if (category_desc.category == str) {
flag = category_desc.flag;
return true;
}
}
return false;
}
std::string ListLogCategories() {
std::string ret;
int outcount = 0;
for (const CLogCategoryDesc &category_desc : LogCategories) {
// Omit the special cases.
if (category_desc.flag != BCLog::NONE &&
category_desc.flag != BCLog::ALL) {
if (outcount != 0) {
ret += ", ";
}
ret += category_desc.category;
outcount++;
}
}
return ret;
}
BCLog::Logger::~Logger() {
if (m_fileout) {
fclose(m_fileout);
}
}
std::string BCLog::Logger::LogTimestampStr(const std::string &str) {
std::string strStamped;
if (!m_log_timestamps) {
return str;
}
if (m_started_new_line) {
int64_t nTimeMicros = GetTimeMicros();
strStamped = FormatISO8601DateTime(nTimeMicros / 1000000);
if (m_log_time_micros) {
strStamped += strprintf(".%06d", nTimeMicros % 1000000);
}
int64_t mocktime = GetMockTime();
if (mocktime) {
strStamped +=
" (mocktime: " + FormatISO8601DateTime(mocktime) + ")";
}
strStamped += ' ' + str;
} else {
strStamped = str;
}
if (!str.empty() && str[str.size() - 1] == '\n') {
m_started_new_line = true;
} else {
m_started_new_line = false;
}
return strStamped;
}
int BCLog::Logger::LogPrintStr(const std::string &str) {
// Returns total number of characters written.
int ret = 0;
std::string strTimestamped = LogTimestampStr(str);
if (m_print_to_console) {
// Print to console.
ret = fwrite(strTimestamped.data(), 1, strTimestamped.size(), stdout);
fflush(stdout);
} else if (m_print_to_file) {
std::lock_guard<std::mutex> scoped_lock(m_file_mutex);
// Buffer if we haven't opened the log yet.
if (m_fileout == nullptr) {
ret = strTimestamped.length();
m_msgs_before_open.push_back(strTimestamped);
} else {
// Reopen the log file, if requested.
if (m_reopen_file) {
m_reopen_file = false;
fs::path pathDebug = GetDebugLogPath();
if (fsbridge::freopen(pathDebug, "a", m_fileout) != nullptr) {
// unbuffered.
setbuf(m_fileout, nullptr);
}
}
ret = FileWriteStr(strTimestamped, m_fileout);
}
}
return ret;
}
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;
// Scroll debug.log if it's getting too big.
fs::path pathLog = GetDebugLogPath();
FILE *file = fsbridge::fopen(pathLog, "r");
// 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 &&
fs::file_size(pathLog) > 11 * (RECENT_DEBUG_HISTORY_SIZE / 10)) {
// Restart the file with some of the end.
std::vector<char> vch(RECENT_DEBUG_HISTORY_SIZE, 0);
fseek(file, -((long)vch.size()), SEEK_END);
int nBytes = fread(vch.data(), 1, vch.size(), file);
fclose(file);
file = fsbridge::fopen(pathLog, "w");
if (file) {
fwrite(vch.data(), 1, nBytes, file);
fclose(file);
}
} else if (file != nullptr) {
fclose(file);
}
}
void BCLog::Logger::EnableCategory(LogFlags category) {
m_categories |= category;
}
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(LogFlags category) {
m_categories &= ~category;
}
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(LogFlags category) const {
// ALL is not meant to be used as a logging category, but only as a mask
// representing all categories.
if (category == BCLog::NONE || category == BCLog::ALL) {
LogPrintf("Error trying to log using a category mask instead of an "
"explicit category.\n");
return true;
}
return (m_categories.load(std::memory_order_relaxed) & category) != 0;
}
bool BCLog::Logger::DefaultShrinkDebugFile() const {
return m_categories != BCLog::NONE;
}

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