add Python logger to C++

CMakeLists.txt

@@ -8,6 +8,7 @@ set(HEADERS
   fmatrix.hh
   fvector.hh
   getdimension.hh
+  logger.hh
   iteratorrange.hh
   mpihelper.hh
   numpyvector.hh

logger.hh

+#ifndef DUNE_PYTHON_COMMON_LOGGER_HH
+#define DUNE_PYTHON_COMMON_LOGGER_HH
+
+#include <string>
+#include <utility>
+
+#include <dune/common/visibility.hh>
+
+#include <dune/python/pybind11/pybind11.h>
+
+namespace Dune
+{
+
+  namespace Python
+  {
+
+    // Logger
+    // ------
+
+    struct DUNE_PRIVATE Logger
+    {
+      enum class Level : int
+      {
+        critical = 50,
+        error = 40,
+        warning = 30,
+        info = 20,
+        debug = 10,
+        notSet = 0
+      };
+
+      explicit Logger ( const std::string &name )
+        : logging_( pybind11::module::import( "logging" ) ),
+          logger_( logging_.attr( "getLogger" )( name ) )
+      {}
+
+      template< class... Args >
+      void critical ( const std::string &msg, Args &&... args ) const
+      {
+        log( Level::critical, msg, std::forward< Args >( args )... );
+      }
+
+      template< class... Args >
+      void error ( const std::string &msg, Args &&... args ) const
+      {
+        log( Level::error, msg, std::forward< Args >( args )... );
+      }
+
+      template< class... Args >
+      void warning ( const std::string &msg, Args &&... args ) const
+      {
+        log( Level::warning, msg, std::forward< Args >( args )... );
+      }
+
+      template< class... Args >
+      void info ( const std::string &msg, Args &&... args ) const
+      {
+        log( Level::info, msg, std::forward< Args >( args )... );
+      }
+
+      template< class... Args >
+      void debug ( const std::string &msg, Args &&... args ) const
+      {
+        log( Level::debug, msg, std::forward< Args >( args )... );
+      }
+
+      template< class... Args >
+      void log ( int level, const std::string &msg, Args &&... args ) const
+      {
+#if PY_MAJOR_VERSION < 3
+        pybind11::object pyLevel = pybind11::reinterpret_steal< pybind11::object >( PyInt_FromLong( level ) );
+#else // #if PY_MAJOR_VERSION < 3
+        pybind11::object pyLevel = pybind11::int_( level );
+#endif // #else // #if PY_MAJOR_VERSION < 3
+        logger_.attr( "log" )( pyLevel, msg, *pybind11::make_tuple( std::forward< Args >( args )... ) );
+      }
+
+      template< class... Args >
+      void log ( Level level, const std::string &msg, Args &&... args ) const
+      {
+        log( static_cast< int >( level ), msg, std::forward< Args >( args )... );
+      }
+
+      void setLevel ( int level ) { logger_.attr( "setLevel" )( level ); }
+
+      bool isEnabledFor ( int level ) { return pybind11::cast< bool >( logger_.attr( "isEnabledFor" )( level ) ); }
+
+      int getEffectiveLevel () { return pybind11::cast< int >( logger_.attr( "getEffectiveLevel" )() ); }
+
+    private:
+      pybind11::module logging_;
+      pybind11::object logger_;
+    };
+
+  } // namespace Python
+
+} // namespace Dune
+
+#endif // #ifndef DUNE_PYTHON_COMMON_LOGGER_HH