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- /*
- * Copyright Andrey Semashev 2007 - 2015.
- * Distributed under the Boost Software License, Version 1.0.
- * (See accompanying file LICENSE_1_0.txt or copy at
- * http://www.boost.org/LICENSE_1_0.txt)
- */
- #include <string>
- #include <fstream>
- #include <iostream>
- #include <stdexcept>
- #include <boost/smart_ptr/shared_ptr.hpp>
- #include <boost/date_time/posix_time/posix_time_types.hpp>
- #include <boost/phoenix.hpp>
- #include <boost/log/core.hpp>
- #include <boost/log/expressions.hpp>
- #include <boost/log/sinks/sync_frontend.hpp>
- #include <boost/log/sinks/basic_sink_backend.hpp>
- #include <boost/log/sources/logger.hpp>
- #include <boost/log/sources/record_ostream.hpp>
- #include <boost/log/attributes/value_visitation.hpp>
- #include <boost/log/utility/manipulators/add_value.hpp>
- namespace logging = boost::log;
- namespace src = boost::log::sources;
- namespace expr = boost::log::expressions;
- namespace sinks = boost::log::sinks;
- namespace keywords = boost::log::keywords;
- //[ example_extension_stat_collector_definition
- // The backend collects statistical information about network activity of the application
- class stat_collector :
- public sinks::basic_sink_backend<
- sinks::combine_requirements<
- sinks::synchronized_feeding, /*< we will have to store internal data, so let's require frontend to synchronize feeding calls to the backend >*/
- sinks::flushing /*< also enable flushing support >*/
- >::type
- >
- {
- private:
- // The file to write the collected information to
- std::ofstream m_csv_file;
- // Here goes the data collected so far:
- // Active connections
- unsigned int m_active_connections;
- // Sent bytes
- unsigned int m_sent_bytes;
- // Received bytes
- unsigned int m_received_bytes;
- // The number of collected records since the last write to the file
- unsigned int m_collected_count;
- // The time when the collected data has been written to the file last time
- boost::posix_time::ptime m_last_store_time;
- public:
- // The constructor initializes the internal data
- explicit stat_collector(const char* file_name);
- // The function consumes the log records that come from the frontend
- void consume(logging::record_view const& rec);
- // The function flushes the file
- void flush();
- private:
- // The function resets statistical accumulators to initial values
- void reset_accumulators();
- // The function writes the collected data to the file
- void write_data();
- };
- //]
- // The constructor initializes the internal data
- stat_collector::stat_collector(const char* file_name) :
- m_csv_file(file_name, std::ios::app),
- m_active_connections(0),
- m_last_store_time(boost::posix_time::microsec_clock::universal_time())
- {
- reset_accumulators();
- if (!m_csv_file.is_open())
- throw std::runtime_error("could not open the CSV file");
- }
- //[ example_extension_stat_collector_consume
- BOOST_LOG_ATTRIBUTE_KEYWORD(sent, "Sent", unsigned int)
- BOOST_LOG_ATTRIBUTE_KEYWORD(received, "Received", unsigned int)
- // The function consumes the log records that come from the frontend
- void stat_collector::consume(logging::record_view const& rec)
- {
- // Accumulate statistical readings
- if (rec.attribute_values().count("Connected"))
- ++m_active_connections;
- else if (rec.attribute_values().count("Disconnected"))
- --m_active_connections;
- else
- {
- namespace phoenix = boost::phoenix;
- logging::visit(sent, rec, phoenix::ref(m_sent_bytes) += phoenix::placeholders::_1);
- logging::visit(received, rec, phoenix::ref(m_received_bytes) += phoenix::placeholders::_1);
- }
- ++m_collected_count;
- // Check if it's time to write the accumulated data to the file
- boost::posix_time::ptime now = boost::posix_time::microsec_clock::universal_time();
- if (now - m_last_store_time >= boost::posix_time::minutes(1))
- {
- write_data();
- m_last_store_time = now;
- }
- }
- // The function writes the collected data to the file
- void stat_collector::write_data()
- {
- m_csv_file << m_active_connections
- << ',' << m_sent_bytes
- << ',' << m_received_bytes
- << std::endl;
- reset_accumulators();
- }
- // The function resets statistical accumulators to initial values
- void stat_collector::reset_accumulators()
- {
- m_sent_bytes = m_received_bytes = 0;
- m_collected_count = 0;
- }
- //]
- //[ example_extension_stat_collector_flush
- // The function flushes the file
- void stat_collector::flush()
- {
- // Store any data that may have been collected since the list write to the file
- if (m_collected_count > 0)
- {
- write_data();
- m_last_store_time = boost::posix_time::microsec_clock::universal_time();
- }
- m_csv_file.flush();
- }
- //]
- // Complete sink type
- typedef sinks::synchronous_sink< stat_collector > sink_t;
- void init_logging()
- {
- boost::shared_ptr< logging::core > core = logging::core::get();
- boost::shared_ptr< stat_collector > backend(new stat_collector("stat.csv"));
- boost::shared_ptr< sink_t > sink(new sink_t(backend));
- core->add_sink(sink);
- }
- int main(int, char*[])
- {
- init_logging();
- src::logger lg;
- BOOST_LOG(lg) << logging::add_value("Connected", true);
- BOOST_LOG(lg) << logging::add_value("Sent", 100u);
- BOOST_LOG(lg) << logging::add_value("Received", 200u);
- logging::core::get()->flush();
- return 0;
- }
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