cpp-logger/src/loggers/console_logger.cxx

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

#include <iostream>

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

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

using namespace logging;

static std::string validate_or_throw(logging::properties const& props) {
  expects(props.type == properties::OBJECT, "expected properties to be a map");
  auto it = props.obj.find("target");
  expects(it != props.obj.end(), "expected a console target entry");
  expects(it->second.type == properties::STRING,
          "expected properties[\"target\"] to be a string");
  return it->second.value;
}

class console_logger : public logger_impl {
public:
  static std::shared_ptr<logger_impl> create(properties const& props);
  
  explicit console_logger(std::ostream& os);
  
  void write(logpacket const & pkt) override;
  
  void flush() override;
private:
  std::ostream& out_;
};

std::shared_ptr<logger_impl> console_logger::create(properties const& props) {
  const std::string target = validate_or_throw(props);
  if (target == "SYSTEM_OUT") {
    return std::make_shared<console_logger>(std::cout);
  } else if (target == "SYSTEM_ERR") {
    return std::make_shared<console_logger>(std::cerr);
  } else {
    throw std::logic_error{target + " is not a valid console"};
  }
}

console_logger::console_logger(std::ostream& os) : out_(os) {}

void console_logger::write(logpacket const & pkt) {
  out_ << pkt.message;
}

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

namespace {
  bool _ = impl_factory::instance().bind("Console", console_logger::create);
}