2020-05-30 17:33:27 +02:00
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/*
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** Copyright (C) 2020 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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**
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** This program is free software; you can redistribute it and/or modify it
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** under the terms of the GNU General Public License as published by the
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** Free Software Foundation; either version 3, or (at your option) any
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** later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation,
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** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**
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*/
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#define G_LOG_USE_STRUCTURED
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#include <glib.h>
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#include <glib/gstdio.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <iostream>
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#include <fstream>
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#include "mu-logger.hh"
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using namespace Mu;
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constexpr auto MuLogDomain = "mu";
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static bool MuLogInitialized = false;
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static Mu::LogOptions MuLogOptions;
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static std::ofstream MuStream;
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static auto MaxLogFileSize = 1000 * 1024;
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static std::string MuLogPath;
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static bool
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maybe_open_logfile ()
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{
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if (MuStream.is_open())
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return true;
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MuStream.open (MuLogPath, std::ios::out | std::ios::app );
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if (!MuStream.is_open()) {
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std::cerr << "opening " << MuLogPath << " failed:"
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<< strerror(errno) << std::endl;
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return false;
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}
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MuStream.sync_with_stdio(false);
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return true;
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}
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static bool
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maybe_rotate_logfile ()
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{
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static unsigned n = 0;
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if (n++ % 1000 != 0)
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return true;
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GStatBuf statbuf;
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if (::stat (MuLogPath.c_str(), &statbuf) == -1 ||
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statbuf.st_size <= MaxLogFileSize)
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return true;
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const auto old = MuLogPath + ".old";
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g_unlink(old.c_str()); // opportunistic
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if (MuStream.is_open())
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MuStream.close();
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if (g_rename(MuLogPath.c_str(), old.c_str()) != 0)
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std::cerr << "failed to rename "
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<< MuLogPath << " -> " << old.c_str()
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<< ": " << ::strerror(errno) << std::endl;
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return maybe_open_logfile();
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}
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static GLogWriterOutput
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log_file (GLogLevelFlags level, const GLogField *fields, gsize n_fields,
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gpointer user_data)
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{
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if (!maybe_open_logfile())
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return G_LOG_WRITER_UNHANDLED;
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char timebuf[22];
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time_t now{::time(NULL)};
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::strftime (timebuf, sizeof(timebuf), "%F %T", ::localtime(&now));
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char *msg = g_log_writer_format_fields (level, fields, n_fields, FALSE);
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if (msg && msg[0] == '\n') // hmm... seems lines start with '\n'r
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msg[0] = ' ';
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MuStream << timebuf << ' ' << msg << std::endl;
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g_free (msg);
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return maybe_rotate_logfile() ? G_LOG_WRITER_HANDLED : G_LOG_WRITER_UNHANDLED;
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}
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static GLogWriterOutput
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log_stdouterr (GLogLevelFlags level, const GLogField *fields, gsize n_fields,
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gpointer user_data)
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{
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return g_log_writer_standard_streams (level, fields, n_fields, user_data);
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}
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static GLogWriterOutput
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log_journal (GLogLevelFlags level, const GLogField *fields, gsize n_fields,
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gpointer user_data)
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{
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return g_log_writer_journald (level, fields, n_fields, user_data);
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}
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void
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Mu::log_init (const std::string& path, Mu::LogOptions opts)
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{
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if (MuLogInitialized) {
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g_error ("logging is already initialized");
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return;
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}
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MuLogOptions = opts;
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MuLogPath = path;
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g_log_set_writer_func (
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[](GLogLevelFlags level, const GLogField *fields, gsize n_fields,
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gpointer user_data) {
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// filter out debug-level messages?
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if (level == G_LOG_LEVEL_DEBUG &&
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(none_of (MuLogOptions & Mu::LogOptions::Debug)))
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return G_LOG_WRITER_HANDLED;
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// log criticals to stdout / err or if asked
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if (level == G_LOG_LEVEL_CRITICAL ||
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any_of(MuLogOptions & Mu::LogOptions::StdOutErr)){
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log_stdouterr (level, fields, n_fields, user_data);
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}
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// log to the journal, or, if not available to a file.
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if (log_journal (level, fields, n_fields, user_data) !=
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G_LOG_WRITER_HANDLED)
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return log_file (level, fields, n_fields, user_data);
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else
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return G_LOG_WRITER_HANDLED;
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}, NULL, NULL);
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g_message ("logging initialized; debug: %s, stdout/stderr: %s",
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any_of(log_get_options() & LogOptions::Debug) ? "yes" : "no",
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any_of(log_get_options() & LogOptions::StdOutErr) ? "yes" : "no");
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MuLogInitialized = true;
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}
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void
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Mu::log_uninit ()
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{
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2020-06-26 18:21:04 +02:00
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if (!MuLogInitialized)
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2020-05-30 17:33:27 +02:00
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return;
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if (MuStream.is_open())
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MuStream.close();
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MuLogInitialized = false;
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}
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void
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Mu::log_set_options (Mu::LogOptions opts)
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{
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MuLogOptions = opts;
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}
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Mu::LogOptions
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Mu::log_get_options ()
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{
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return MuLogOptions;
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}
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