cpp-logger/src/loggers/file_appender.cxx

//
//  file_logger.cxx
//  logging
//
//  Created by Sam Jaffe on 4/1/19.
//

#include <fstream>

#include "../../../../paradigm/declarative/expect/include/expect/expect.hpp"
#include "../../../../types/resource_factory/include/resource_factory/prototype_factory.hpp"

#include "logger/detail/appender.h"
#include "logger/log_manager.h"
#include "logger/properties.h"

using namespace logging;

class file_appender : public appender {
public:
  static std::shared_ptr<appender> create(properties const&);
  
  explicit file_appender(const std::string& fname, bool append);
  
  void write(std::string const & msg) override;
  void flush() override;
private:
  bool flush_immediately_{false};
  std::ofstream out_;
};

static bool is_append(properties const & props) {
  return props.contains("append") && props["append"];
}

std::shared_ptr<appender> file_appender::create(properties const & props) {
  file_appender app(props["file"], is_append(props));
  return std::make_shared<file_appender>(std::move(app));
}

static std::ios_base::openmode mode(bool append) {
  return (append ? std::ios_base::app : 0) | std::ios_base::out;
}

file_appender::file_appender(const std::string& fname, bool append)
: out_(fname, mode(append)) {}

void file_appender::write(std::string const & msg) {
  out_ << msg;
  if (flush_immediately_) {
    flush();
  }
}

void file_appender::flush() { out_.flush(); }

namespace {
  bool _ = appenders::instance().bind("File", file_appender::create);
}