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moby--moby/libcontainerd/client.go

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package libcontainerd
import (
"fmt"
"sync"
"github.com/docker/docker/pkg/locker"
)
// clientCommon contains the platform agnostic fields used in the client structure
type clientCommon struct {
backend Backend
containers map[string]*container
locker *locker.Locker
mapMutex sync.RWMutex // protects read/write operations from containers map
}
func (clnt *client) lock(containerID string) {
clnt.locker.Lock(containerID)
}
func (clnt *client) unlock(containerID string) {
clnt.locker.Unlock(containerID)
}
// must hold a lock for cont.containerID
func (clnt *client) appendContainer(cont *container) {
clnt.mapMutex.Lock()
clnt.containers[cont.containerID] = cont
clnt.mapMutex.Unlock()
}
func (clnt *client) deleteContainer(containerID string) {
clnt.mapMutex.Lock()
delete(clnt.containers, containerID)
clnt.mapMutex.Unlock()
}
func (clnt *client) getContainer(containerID string) (*container, error) {
clnt.mapMutex.RLock()
container, ok := clnt.containers[containerID]
defer clnt.mapMutex.RUnlock()
if !ok {
return nil, fmt.Errorf("invalid container: %s", containerID) // fixme: typed error
}
return container, nil
}