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moby--moby/volume/drivers/extpoint.go
Morgan Bauer 9af963aba0
lint fixes for volume/*
- comments on exported values
 - constant string replaced by constant reference
 - unexport implementation details of VolumeDriver 'local'
 - add fixed packages to linter list

Signed-off-by: Morgan Bauer <mbauer@us.ibm.com>
2015-07-28 10:40:44 -07:00

67 lines
1.6 KiB
Go

package volumedrivers
import (
"fmt"
"sync"
"github.com/docker/docker/pkg/plugins"
"github.com/docker/docker/volume"
)
// currently created by hand. generation tool would generate this like:
// $ extpoint-gen Driver > volume/extpoint.go
var drivers = &driverExtpoint{extensions: make(map[string]volume.Driver)}
type driverExtpoint struct {
extensions map[string]volume.Driver
sync.Mutex
}
// Register associates the given driver to the given name, checking if
// the name is already associated
func Register(extension volume.Driver, name string) bool {
drivers.Lock()
defer drivers.Unlock()
if name == "" {
return false
}
_, exists := drivers.extensions[name]
if exists {
return false
}
drivers.extensions[name] = extension
return true
}
// Unregister dissociates the name from it's driver, if the association exists.
func Unregister(name string) bool {
drivers.Lock()
defer drivers.Unlock()
_, exists := drivers.extensions[name]
if !exists {
return false
}
delete(drivers.extensions, name)
return true
}
// Lookup returns the driver associated with the given name. If a
// driver with the given name has not been registered it checks if
// there is a VolumeDriver plugin available with the given name.
func Lookup(name string) (volume.Driver, error) {
drivers.Lock()
defer drivers.Unlock()
ext, ok := drivers.extensions[name]
if ok {
return ext, nil
}
pl, err := plugins.Get(name, "VolumeDriver")
if err != nil {
return nil, fmt.Errorf("Error looking up volume plugin %s: %v", name, err)
}
d := NewVolumeDriver(name, pl.Client)
drivers.extensions[name] = d
return d, nil
}