util: logging facility
refs #3562
Change-Id: I61d934c5306e1a73b41c81aeb3524d6bf581af3c
diff --git a/src/util/logger.cpp b/src/util/logger.cpp
new file mode 100644
index 0000000..04ad954
--- /dev/null
+++ b/src/util/logger.cpp
@@ -0,0 +1,113 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2016 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "logger.hpp"
+
+#include "logging.hpp"
+#include "time.hpp"
+
+#include <cinttypes>
+#include <stdio.h>
+#include <type_traits>
+
+namespace ndn {
+namespace util {
+
+std::ostream&
+operator<<(std::ostream& os, LogLevel level)
+{
+ switch (level) {
+ case LogLevel::FATAL:
+ return os << "FATAL";
+ case LogLevel::NONE:
+ return os << "NONE";
+ case LogLevel::ERROR:
+ return os << "ERROR";
+ case LogLevel::WARN:
+ return os << "WARN";
+ case LogLevel::INFO:
+ return os << "INFO";
+ case LogLevel::DEBUG:
+ return os << "DEBUG";
+ case LogLevel::TRACE:
+ return os << "TRACE";
+ case LogLevel::ALL:
+ return os << "ALL";
+ }
+
+ BOOST_THROW_EXCEPTION(std::invalid_argument("unknown log level " + to_string(static_cast<int>(level))));
+}
+
+LogLevel
+parseLogLevel(const std::string& s)
+{
+ if (s == "FATAL")
+ return LogLevel::FATAL;
+ else if (s == "NONE")
+ return LogLevel::NONE;
+ else if (s == "ERROR")
+ return LogLevel::ERROR;
+ else if (s == "WARN")
+ return LogLevel::WARN;
+ else if (s == "INFO")
+ return LogLevel::INFO;
+ else if (s == "DEBUG")
+ return LogLevel::DEBUG;
+ else if (s == "TRACE")
+ return LogLevel::TRACE;
+ else if (s == "ALL")
+ return LogLevel::ALL;
+
+ BOOST_THROW_EXCEPTION(std::invalid_argument("unrecognized log level '" + s + "'"));
+}
+
+Logger::Logger(const std::string& name)
+ : m_moduleName(name)
+{
+ this->setLevel(LogLevel::NONE);
+ Logging::addLogger(*this);
+}
+
+std::ostream&
+operator<<(std::ostream& os, const LoggerTimestamp&)
+{
+ using namespace ndn::time;
+
+ static const microseconds::rep ONE_SECOND = 1000000;
+ microseconds::rep usecs = duration_cast<microseconds>(
+ system_clock::now().time_since_epoch()).count();
+
+ // 10 (whole seconds) + '.' + 6 (fraction) + '\0'
+ char buffer[10 + 1 + 6 + 1];
+ BOOST_ASSERT_MSG(usecs / ONE_SECOND <= 9999999999L,
+ "whole seconds cannot fit in 10 characters");
+
+ static_assert(std::is_same<microseconds::rep, int_least64_t>::value,
+ "PRIdLEAST64 is incompatible with microseconds::rep");
+ // std::snprintf unavailable in some environments <https://redmine.named-data.net/issues/2299>
+ snprintf(buffer, sizeof(buffer), "%" PRIdLEAST64 ".%06" PRIdLEAST64,
+ usecs / ONE_SECOND, usecs % ONE_SECOND);
+
+ return os << buffer;
+}
+
+} // namespace util
+} // namespace ndn