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threads: prefix log messages with thread names

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Introduce a new flag (`-logthreadnames`) which allows toggling
of this behavior.
This commit is contained in:
James O'Beirne 2018-05-05 14:14:43 -04:00 committed by James O'Beirne
parent ddd95ccb80
commit 383b186c28
4 changed files with 26 additions and 10 deletions
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6
doc/release-notes-15849.md Normal file
View file

@ -0,0 +1,6 @@
Thread names in logs
--------------------
On platforms supporting `thread_local`, log lines can be prefixed with the name
of the thread that caused the log. To enable this behavior, use
`-logthreadnames=1`.

2
src/init.cpp
View file

@ -508,6 +508,7 @@ void SetupServerArgs()
gArgs.AddArg("-debugexclude=<category>", strprintf("Exclude debugging information for a category. Can be used in conjunction with -debug=1 to output debug logs for all categories except one or more specified categories."), false, OptionsCategory::DEBUG_TEST);
gArgs.AddArg("-logips", strprintf("Include IP addresses in debug output (default: %u)", DEFAULT_LOGIPS), false, OptionsCategory::DEBUG_TEST);
gArgs.AddArg("-logtimestamps", strprintf("Prepend debug output with timestamp (default: %u)", DEFAULT_LOGTIMESTAMPS), false, OptionsCategory::DEBUG_TEST);
gArgs.AddArg("-logthreadnames", strprintf("Prepend debug output with name of the originating thread (only available on platforms supporting thread_local) (default: %u)", DEFAULT_LOGTHREADNAMES), false, OptionsCategory::DEBUG_TEST);
gArgs.AddArg("-logtimemicros", strprintf("Add microsecond precision to debug timestamps (default: %u)", DEFAULT_LOGTIMEMICROS), true, OptionsCategory::DEBUG_TEST);
gArgs.AddArg("-mocktime=<n>", "Replace actual time with <n> seconds since epoch (default: 0)", true, OptionsCategory::DEBUG_TEST);
gArgs.AddArg("-maxsigcachesize=<n>", strprintf("Limit sum of signature cache and script execution cache sizes to <n> MiB (default: %u)", DEFAULT_MAX_SIG_CACHE_SIZE), true, OptionsCategory::DEBUG_TEST);
@ -866,6 +867,7 @@ void InitLogging()
LogInstance().m_print_to_console = gArgs.GetBoolArg("-printtoconsole", !gArgs.GetBoolArg("-daemon", false));
LogInstance().m_log_timestamps = gArgs.GetBoolArg("-logtimestamps", DEFAULT_LOGTIMESTAMPS);
LogInstance().m_log_time_micros = gArgs.GetBoolArg("-logtimemicros", DEFAULT_LOGTIMEMICROS);
LogInstance().m_log_threadnames = gArgs.GetBoolArg("-logthreadnames", DEFAULT_LOGTHREADNAMES);
fLogIPs = gArgs.GetBoolArg("-logips", DEFAULT_LOGIPS);

24
src/logging.cpp
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@ -4,8 +4,11 @@
// 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()
@ -196,21 +199,24 @@ std::string BCLog::Logger::LogTimestampStr(const std::string &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;
}
void BCLog::Logger::LogPrintStr(const std::string &str)
{
std::string strTimestamped = LogTimestampStr(str);
std::string str_prefixed = 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_print_to_console) {
// print to console
fwrite(strTimestamped.data(), 1, strTimestamped.size(), stdout);
fwrite(str_prefixed.data(), 1, str_prefixed.size(), stdout);
fflush(stdout);
}
if (m_print_to_file) {
@ -218,7 +224,7 @@ void BCLog::Logger::LogPrintStr(const std::string &str)
// buffer if we haven't opened the log yet
if (m_fileout == nullptr) {
m_msgs_before_open.push_back(strTimestamped);
m_msgs_before_open.push_back(str_prefixed);
}
else
{
@ -232,7 +238,7 @@ void BCLog::Logger::LogPrintStr(const std::string &str)
m_fileout = new_fileout;
}
}
FileWriteStr(strTimestamped, m_fileout);
FileWriteStr(str_prefixed, m_fileout);
}
}
}

2
src/logging.h
View file

@ -19,6 +19,7 @@
static const bool DEFAULT_LOGTIMEMICROS = false;
static const bool DEFAULT_LOGIPS = false;
static const bool DEFAULT_LOGTIMESTAMPS = true;
static const bool DEFAULT_LOGTHREADNAMES = false;
extern const char * const DEFAULT_DEBUGLOGFILE;
extern bool fLogIPs;
@ -81,6 +82,7 @@ namespace BCLog {
bool m_log_timestamps = DEFAULT_LOGTIMESTAMPS;
bool m_log_time_micros = DEFAULT_LOGTIMEMICROS;
bool m_log_threadnames = DEFAULT_LOGTHREADNAMES;
fs::path m_file_path;
std::atomic<bool> m_reopen_file{false};