зеркало из https://github.com/microsoft/docker.git
271 строка
6.0 KiB
Go
271 строка
6.0 KiB
Go
package daemon
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import (
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"fmt"
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"sync"
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"time"
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"github.com/docker/docker/daemon/execdriver"
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"github.com/docker/docker/pkg/units"
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)
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// State holds the current container state, and has methods to get and
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// set the state. Container has an embed, which allows all of the
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// functions defined against State to run against Container.
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type State struct {
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sync.Mutex
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// FIXME: Why do we have both paused and running if a
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// container cannot be paused and running at the same time?
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Running bool
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Paused bool
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Restarting bool
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OOMKilled bool
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removalInProgress bool // Not need for this to be persistent on disk.
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Dead bool
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Pid int
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ExitCode int
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Error string // contains last known error when starting the container
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StartedAt time.Time
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FinishedAt time.Time
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waitChan chan struct{}
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}
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// NewState creates a default state object with a fresh channel for state changes.
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func NewState() *State {
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return &State{
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waitChan: make(chan struct{}),
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}
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}
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// String returns a human-readable description of the state
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func (s *State) String() string {
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if s.Running {
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if s.Paused {
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return fmt.Sprintf("Up %s (Paused)", units.HumanDuration(time.Now().UTC().Sub(s.StartedAt)))
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}
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if s.Restarting {
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return fmt.Sprintf("Restarting (%d) %s ago", s.ExitCode, units.HumanDuration(time.Now().UTC().Sub(s.FinishedAt)))
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}
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return fmt.Sprintf("Up %s", units.HumanDuration(time.Now().UTC().Sub(s.StartedAt)))
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}
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if s.removalInProgress {
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return "Removal In Progress"
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}
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if s.Dead {
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return "Dead"
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}
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if s.StartedAt.IsZero() {
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return "Created"
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}
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if s.FinishedAt.IsZero() {
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return ""
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}
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return fmt.Sprintf("Exited (%d) %s ago", s.ExitCode, units.HumanDuration(time.Now().UTC().Sub(s.FinishedAt)))
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}
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// StateString returns a single string to describe state
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func (s *State) StateString() string {
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if s.Running {
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if s.Paused {
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return "paused"
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}
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if s.Restarting {
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return "restarting"
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}
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return "running"
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}
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if s.Dead {
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return "dead"
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}
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if s.StartedAt.IsZero() {
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return "created"
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}
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return "exited"
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}
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func isValidStateString(s string) bool {
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if s != "paused" &&
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s != "restarting" &&
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s != "running" &&
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s != "dead" &&
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s != "created" &&
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s != "exited" {
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return false
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}
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return true
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}
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func wait(waitChan <-chan struct{}, timeout time.Duration) error {
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if timeout < 0 {
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<-waitChan
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return nil
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}
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select {
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case <-time.After(timeout):
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return fmt.Errorf("Timed out: %v", timeout)
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case <-waitChan:
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return nil
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}
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}
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// waitRunning waits until state is running. If state is already
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// running it returns immediately. If you want wait forever you must
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// supply negative timeout. Returns pid, that was passed to
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// setRunningLocking.
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func (s *State) waitRunning(timeout time.Duration) (int, error) {
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s.Lock()
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if s.Running {
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pid := s.Pid
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s.Unlock()
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return pid, nil
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}
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waitChan := s.waitChan
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s.Unlock()
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if err := wait(waitChan, timeout); err != nil {
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return -1, err
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}
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return s.getPID(), nil
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}
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// WaitStop waits until state is stopped. If state already stopped it returns
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// immediately. If you want wait forever you must supply negative timeout.
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// Returns exit code, that was passed to setStoppedLocking
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func (s *State) WaitStop(timeout time.Duration) (int, error) {
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s.Lock()
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if !s.Running {
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exitCode := s.ExitCode
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s.Unlock()
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return exitCode, nil
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}
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waitChan := s.waitChan
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s.Unlock()
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if err := wait(waitChan, timeout); err != nil {
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return -1, err
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}
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return s.getExitCode(), nil
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}
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// IsRunning returns whether the running flag is set. Used by Container to check whether a container is running.
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func (s *State) IsRunning() bool {
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s.Lock()
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res := s.Running
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s.Unlock()
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return res
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}
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// GetPID holds the process id of a container.
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func (s *State) getPID() int {
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s.Lock()
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res := s.Pid
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s.Unlock()
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return res
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}
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func (s *State) getExitCode() int {
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s.Lock()
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res := s.ExitCode
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s.Unlock()
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return res
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}
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func (s *State) setRunningLocking(pid int) {
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s.Lock()
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s.setRunning(pid)
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s.Unlock()
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}
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func (s *State) setRunning(pid int) {
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s.Error = ""
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s.Running = true
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s.Paused = false
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s.Restarting = false
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s.ExitCode = 0
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s.Pid = pid
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s.StartedAt = time.Now().UTC()
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close(s.waitChan) // fire waiters for start
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s.waitChan = make(chan struct{})
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}
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func (s *State) setStoppedLocking(exitStatus *execdriver.ExitStatus) {
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s.Lock()
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s.setStopped(exitStatus)
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s.Unlock()
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}
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func (s *State) setStopped(exitStatus *execdriver.ExitStatus) {
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s.Running = false
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s.Restarting = false
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s.Pid = 0
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s.FinishedAt = time.Now().UTC()
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s.ExitCode = exitStatus.ExitCode
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s.OOMKilled = exitStatus.OOMKilled
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close(s.waitChan) // fire waiters for stop
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s.waitChan = make(chan struct{})
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}
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// setRestarting is when docker handles the auto restart of containers when they are
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// in the middle of a stop and being restarted again
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func (s *State) setRestartingLocking(exitStatus *execdriver.ExitStatus) {
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s.Lock()
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s.setRestarting(exitStatus)
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s.Unlock()
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}
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func (s *State) setRestarting(exitStatus *execdriver.ExitStatus) {
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// we should consider the container running when it is restarting because of
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// all the checks in docker around rm/stop/etc
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s.Running = true
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s.Restarting = true
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s.Pid = 0
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s.FinishedAt = time.Now().UTC()
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s.ExitCode = exitStatus.ExitCode
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s.OOMKilled = exitStatus.OOMKilled
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close(s.waitChan) // fire waiters for stop
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s.waitChan = make(chan struct{})
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}
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// setError sets the container's error state. This is useful when we want to
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// know the error that occurred when container transits to another state
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// when inspecting it
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func (s *State) setError(err error) {
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s.Error = err.Error()
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}
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func (s *State) isPaused() bool {
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s.Lock()
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res := s.Paused
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s.Unlock()
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return res
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}
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func (s *State) setRemovalInProgress() error {
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s.Lock()
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defer s.Unlock()
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if s.removalInProgress {
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return fmt.Errorf("Status is already RemovalInProgress")
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}
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s.removalInProgress = true
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return nil
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}
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func (s *State) resetRemovalInProgress() {
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s.Lock()
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s.removalInProgress = false
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s.Unlock()
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}
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func (s *State) setDead() {
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s.Lock()
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s.Dead = true
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s.Unlock()
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}
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