external_launch.h

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#ifndef LIBPRESSIO_EXTERNAL_LAUNCH_H
#define LIBPRESSIO_EXTERNAL_LAUNCH_H
 
 
#include "libpressio_ext/cpp/compressor.h"
#include "libpressio_ext/cpp/configurable.h"
#include "libpressio_ext/cpp/errorable.h"
#include "libpressio_ext/cpp/pressio.h"
#include <memory>
#include <string>
 
enum extern_proc_error_codes {
  success=0, 
  pipe_error=1, 
  fork_error=2,
  exec_error=3,
  format_error=4
};
 
struct extern_proc_results {
  std::string proc_stdout; 
  std::string proc_stderr;
  int return_code = 0; 
  int error_code = success;
};
 
struct libpressio_launch_plugin: public pressio_configurable {
  virtual ~libpressio_launch_plugin()=default;
  virtual extern_proc_results launch(std::vector<std::string> const& args) const =0;
 
  pressio_options get_documentation() const final {
    pressio_options opts;
    opts.copy_from(get_documentation_impl());
    set(opts, "pressio:thread_safe", "level of thread safety provided by the compressor");
    set(opts, "pressio:stability", "level of stablity provided by the compressor; see the README for libpressio");
    return opts;
  }
 
  virtual pressio_options get_documentation_impl() const=0;
 
  virtual std::unique_ptr<libpressio_launch_plugin> clone() const = 0;
};
 
struct pressio_launcher {
 
  pressio_launcher()=default;
 
  pressio_launcher(std::unique_ptr<libpressio_launch_plugin>&& ptr): plugin(std::move(ptr)) {}
 
  pressio_launcher(pressio_launcher const& launcher): plugin(launcher.plugin->clone()) {}
 
  pressio_launcher(pressio_launcher&& compressor)=default;
 
  pressio_launcher& operator=(pressio_launcher&& launcher) noexcept=default;
 
  operator bool() const {
    return bool(plugin);
  }
 
  libpressio_launch_plugin& operator*() const noexcept {
    return *plugin;
  }
 
  libpressio_launch_plugin* operator->() const noexcept {
    return plugin.get();
  }
 
  std::unique_ptr<libpressio_launch_plugin> plugin;
};
 
pressio_registry<std::unique_ptr<libpressio_launch_plugin>>& launch_plugins();
 
#endif /* end of include guard: LIBPRESSIO_EXTERNAL_LAUNCH_H */