CmvrControlStation/include/console_bridge/console.h

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/* Author: Ryan Luna, Ioan Sucan */

#ifndef INCLUDE_CONSOLE_BRIDGE_CONSOLE_H_
#define INCLUDE_CONSOLE_BRIDGE_CONSOLE_H_

#include <string>

#include "./console_bridge_export.h"

/** \file console.h
    \defgroup logging Logging Macros
    \{

    \def CONSOLE_BRIDGE_logError(fmt, ...)
    \brief Log a formatted error string.
    \remarks This macro takes the same arguments as <a href="http://www.cplusplus.com/reference/clibrary/cstdio/printf">printf</a>.

    \def CONSOLE_BRIDGE_logWarn(fmt, ...)
    \brief Log a formatted warning string.
    \remarks This macro takes the same arguments as <a href="http://www.cplusplus.com/reference/clibrary/cstdio/printf">printf</a>.

    \def CONSOLE_BRIDGE_logInform(fmt, ...)
    \brief Log a formatted information string.
    \remarks This macro takes the same arguments as <a href="http://www.cplusplus.com/reference/clibrary/cstdio/printf">printf</a>.

    \def CONSOLE_BRIDGE_logDebug(fmt, ...)
    \brief Log a formatted debugging string.
    \remarks This macro takes the same arguments as <a href="http://www.cplusplus.com/reference/clibrary/cstdio/printf">printf</a>.

    \}
*/
#define CONSOLE_BRIDGE_logError(...)  \
  console_bridge::log(__FILE__, __LINE__, console_bridge::CONSOLE_BRIDGE_LOG_ERROR, __VA_ARGS__)

#define CONSOLE_BRIDGE_logWarn(...)   \
  console_bridge::log(__FILE__, __LINE__, console_bridge::CONSOLE_BRIDGE_LOG_WARN,  __VA_ARGS__)

#define CONSOLE_BRIDGE_logInform(...) \
  console_bridge::log(__FILE__, __LINE__, console_bridge::CONSOLE_BRIDGE_LOG_INFO,  __VA_ARGS__)

#define CONSOLE_BRIDGE_logDebug(...)  \
  console_bridge::log(__FILE__, __LINE__, console_bridge::CONSOLE_BRIDGE_LOG_DEBUG, __VA_ARGS__)

/**
 * \brief Message namespace. This contains classes needed to output error messages (or logging)
 * from within the library. Message logging can be performed with \ref logging "logging macros"
 */
namespace console_bridge
{
/** \brief The set of priorities for message logging */
enum CONSOLE_BRIDGE_DLLAPI LogLevel
  {
    CONSOLE_BRIDGE_LOG_DEBUG = 0,
    CONSOLE_BRIDGE_LOG_INFO,
    CONSOLE_BRIDGE_LOG_WARN,
    CONSOLE_BRIDGE_LOG_ERROR,
    CONSOLE_BRIDGE_LOG_NONE
  };

/**
 * \brief Generic class to handle output from a piece of code.
 *
 * In order to handle output from the library in different ways, an implementation of this class
 * needs to be provided. This instance can be set with the useOutputHandler function.
 */
class CONSOLE_BRIDGE_DLLAPI OutputHandler
{
public:
  OutputHandler(void){}

  virtual ~OutputHandler(void){}

  /**
   * \brief log a message to the output handler with the given text and logging level from a
   * specific file and line number
   * \param text to log
   * \param level console_bridge log level
   * \param filename of the output log
   * \param line
   */
  virtual void log(const std::string &text, LogLevel level, const char *filename, int line) = 0;
};

/**
 * \brief Default implementation of OutputHandler. This sends the information to the console.
 */
class CONSOLE_BRIDGE_DLLAPI OutputHandlerSTD : public OutputHandler
{
public:
  OutputHandlerSTD(void) : OutputHandler(){}

  virtual void log(const std::string &text, LogLevel level, const char *filename, int line);
};

/** \brief Implementation of OutputHandler that saves messages in a file. */
class CONSOLE_BRIDGE_DLLAPI OutputHandlerFile : public OutputHandler
{
public:
  /** \brief The name of the file in which to save the message data */
  explicit OutputHandlerFile(const char *filename);

  virtual ~OutputHandlerFile(void);

  virtual void log(const std::string &text, LogLevel level, const char *filename, int line);

private:
  /** \brief The file to save to */
  FILE *file_;
};

/**
 * \brief This function instructs console bridge that no messages should be outputted.
 * Equivalent to useOutputHandler(NULL)
 */
CONSOLE_BRIDGE_DLLAPI void noOutputHandler(void);

/**
 * \brief Restore the output handler that was previously in use (if any)
 */
CONSOLE_BRIDGE_DLLAPI void restorePreviousOutputHandler(void);

/**
 * \brief Specify the instance of the OutputHandler to use.
 * By default, this is OutputHandlerSTD
 */
CONSOLE_BRIDGE_DLLAPI void useOutputHandler(OutputHandler *oh);

/**
 * \brief Get the instance of the OutputHandler currently used.
 * This is NULL in case there is no output handler.
 */
CONSOLE_BRIDGE_DLLAPI OutputHandler* getOutputHandler(void);

/**
 * \brief Set the minimum level of logging data to output. Messages with lower logging levels will
 * not be recorded.
 */
CONSOLE_BRIDGE_DLLAPI void setLogLevel(LogLevel level);

/**
 * \brief Retrieve the current level of logging data. Messages with lower logging levels will not be
 * recorded.
 */
CONSOLE_BRIDGE_DLLAPI LogLevel getLogLevel(void);

/**
 * \brief Root level logging function.  This should not be invoked directly, but rather used via a
 * \ref logging "logging macro". Formats the message string given the arguments and forwards the
 * string to the output handler
 */
CONSOLE_BRIDGE_DLLAPI void log(const char *file,
                               int line,
                               LogLevel level,
                               const char* m,
                               ...);
}  // namespace console_bridge

#endif  // INCLUDE_CONSOLE_BRIDGE_CONSOLE_H_