Boost log integration. (#37)

src/hplog.cpp

@@ -0,0 +1,76 @@
+#include <iostream>
+#include <string>
+#include <boost/log/core.hpp>
+#include <boost/log/expressions.hpp>
+#include <boost/log/expressions/keyword_fwd.hpp>
+#include <boost/log/expressions/keyword.hpp>
+#include <boost/log/sources/global_logger_storage.hpp>
+#include <boost/log/sources/severity_channel_logger.hpp>
+#include <boost/log/sources/record_ostream.hpp>
+#include <boost/log/utility/manipulators/to_log.hpp>
+#include <boost/log/utility/setup/console.hpp>
+#include <boost/log/utility/setup/common_attributes.hpp>
+#include <boost/log/support/date_time.hpp>
+#include "conf.hpp"
+#include "hplog.hpp"
+
+namespace logging = boost::log;
+namespace sinks = boost::log::sinks;
+namespace src = boost::log::sources;
+namespace expr = boost::log::expressions;
+namespace attrs = boost::log::attributes;
+namespace keywords = boost::log::keywords;
+
+namespace hplog
+{
+
+/**
+ * Stream operator overload for converting integer severity vaue to text.
+ */
+std::ostream &operator<<(std::ostream &os, LOG_SEVERITY level)
+{
+    static std::string_view loglevels[] = {"dbg", "info", "warn", "err"};
+    os << loglevels[level];
+    return os;
+}
+
+// Severity attribute value tag type
+struct severity_tag;
+
+void init()
+{
+    // Set log severity level based on contract config.
+    LOG_SEVERITY severity = LOG_SEVERITY::WARN;
+    if (conf::cfg.loglevel == "debug")
+        severity = LOG_SEVERITY::DEBUG;
+    else if (conf::cfg.loglevel == "info")
+        severity = LOG_SEVERITY::INFO;
+    else if (conf::cfg.loglevel == "warn")
+        severity = LOG_SEVERITY::WARN;
+    else if (conf::cfg.loglevel == "error")
+        severity = LOG_SEVERITY::ERROR;
+
+    if (conf::cfg.loggers.count("console") == 1)
+    {
+        logging::add_console_log(
+            std::clog,
+            keywords::filter = (a_severity >= severity),
+            keywords::format =
+                (expr::stream
+                 << expr::format_date_time<boost::posix_time::ptime>("TimeStamp", "%Y-%m-%d %H:%M:%S")
+                 //<< ":" << expr::attr<boost::log::attributes::current_thread_id::value_type>("ThreadID")
+                 << " [" << expr::attr<std::string>("Channel")
+                 << "] [" << expr::attr<LOG_SEVERITY, severity_tag>("Severity")
+                 << "] " << expr::smessage));
+    }
+
+    if (conf::cfg.loggers.count("file") == 1)
+    {
+        // TODO: Add file logger.
+    }
+
+    // Add Boost Log built-in fields for log entries.
+    logging::add_common_attributes();
+}
+
+} // namespace hplog