health_checker.hpp

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
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// See the License for the specific language governing permissions and
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#ifndef __HEALTH_CHECKER_HPP__
#define __HEALTH_CHECKER_HPP__

#include <string>
#include <vector>

#include <mesos/mesos.hpp>

#include <process/http.hpp>
#include <process/owned.hpp>

#include <stout/error.hpp>
#include <stout/lambda.hpp>
#include <stout/option.hpp>
#include <stout/variant.hpp>

#include "checks/checks_runtime.hpp"
#include "checks/checks_types.hpp"

#include "messages/messages.hpp"

namespace mesos {
namespace internal {
namespace checks {

class CheckerProcess;


class HealthChecker
{
public:
  static Try<process::Owned<HealthChecker>> create(
      const HealthCheck& healthCheck,
      const std::string& launcherDir,
      const lambda::function<void(const TaskHealthStatus&)>& callback,
      const TaskID& taskId,
      Variant<runtime::Plain, runtime::Docker, runtime::Nested> runtime);

  ~HealthChecker();

  // Idempotent helpers for pausing and resuming health checking.
  void pause();
  void resume();

private:
  HealthChecker(
      const HealthCheck& _healthCheck,
      const std::string& launcherDir,
      const lambda::function<void(const TaskHealthStatus&)>& _callback,
      const TaskID& _taskId,
      Variant<runtime::Plain, runtime::Docker, runtime::Nested> runtime);

  void processCheckResult(const Try<CheckStatusInfo>& result);
  void failure();
  void success();

  const HealthCheck healthCheck;
  const lambda::function<void(const TaskHealthStatus&)> callback;
  const TaskID taskId;

  const std::string name;
  const process::Time startTime;

  Duration checkGracePeriod;
  uint32_t consecutiveFailures;
  bool initializing;

  process::Owned<CheckerProcess> process;
};

} // namespace checks {
} // namespace internal {
} // namespace mesos {

#endif // __HEALTH_CHECKER_HPP__