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moby--moby/container/health.go
Daniel Nephin 4f0d95fa6e Add canonical import comment
Signed-off-by: Daniel Nephin <dnephin@docker.com>
2018-02-05 16:51:57 -05:00

82 lines
1.9 KiB
Go

package container // import "github.com/docker/docker/container"
import (
"sync"
"github.com/docker/docker/api/types"
"github.com/sirupsen/logrus"
)
// Health holds the current container health-check state
type Health struct {
types.Health
stop chan struct{} // Write struct{} to stop the monitor
mu sync.Mutex
}
// String returns a human-readable description of the health-check state
func (s *Health) String() string {
status := s.Status()
switch status {
case types.Starting:
return "health: starting"
default: // Healthy and Unhealthy are clear on their own
return s.Health.Status
}
}
// Status returns the current health status.
//
// Note that this takes a lock and the value may change after being read.
func (s *Health) Status() string {
s.mu.Lock()
defer s.mu.Unlock()
// This happens when the monitor has yet to be setup.
if s.Health.Status == "" {
return types.Unhealthy
}
return s.Health.Status
}
// SetStatus writes the current status to the underlying health structure,
// obeying the locking semantics.
//
// Status may be set directly if another lock is used.
func (s *Health) SetStatus(new string) {
s.mu.Lock()
defer s.mu.Unlock()
s.Health.Status = new
}
// OpenMonitorChannel creates and returns a new monitor channel. If there
// already is one, it returns nil.
func (s *Health) OpenMonitorChannel() chan struct{} {
s.mu.Lock()
defer s.mu.Unlock()
if s.stop == nil {
logrus.Debug("OpenMonitorChannel")
s.stop = make(chan struct{})
return s.stop
}
return nil
}
// CloseMonitorChannel closes any existing monitor channel.
func (s *Health) CloseMonitorChannel() {
s.mu.Lock()
defer s.mu.Unlock()
if s.stop != nil {
logrus.Debug("CloseMonitorChannel: waiting for probe to stop")
close(s.stop)
s.stop = nil
// unhealthy when the monitor has stopped for compatibility reasons
s.Health.Status = types.Unhealthy
logrus.Debug("CloseMonitorChannel done")
}
}