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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 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/threadnames.h>
#include <util/time.h>
#include <mutex>
const char * const DEFAULT_DEBUGLOGFILE = "debug.log";
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 destructor is never called, the logger and all its members must
* have a trivial destructor.
*
* 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()
{
LockGuard 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()
{
LockGuard 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)) {
if (str == "db") {
// DEPRECATION: Added in 0.20, should start returning an error in 0.21
LogPrintf("Warning: logging category 'db' is deprecated, use 'walletdb' instead\n");
EnableCategory(BCLog::WALLETDB);
return true;
}
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::DefaultShrinkDebugFile() const
{
return m_categories == BCLog::NONE;
}
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::WALLETDB, "walletdb"},
{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::VALIDATION, "validation"},
{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::vector<LogCategory> BCLog::Logger::LogCategoriesList()
{
std::vector<LogCategory> ret;
for (const CLogCategoryDesc& category_desc : LogCategories) {
// Omit the special cases.
if (category_desc.flag != BCLog::NONE && category_desc.flag != BCLog::ALL) {
LogCategory catActive;
catActive.category = category_desc.category;
catActive.active = WillLogCategory(category_desc.flag);
ret.push_back(catActive);
}
}
return ret;
}
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.pop_back();
strStamped += strprintf(".%06dZ", nTimeMicros%1000000);
}
int64_t mocktime = GetMockTime();
if (mocktime) {
strStamped += " (mocktime: " + FormatISO8601DateTime(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;
}
}
void BCLog::Logger::LogPrintStr(const std::string& str)
{
LockGuard scoped_lock(m_cs);
std::string str_prefixed = LogEscapeMessage(str);
if (m_log_threadnames && m_started_new_line) {
str_prefixed.insert(0, "[" + util::ThreadGetInternalName() + "] ");
}
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);
}
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