6e4f9a2e3e
This change is slightly more complex than previous package maves in that the package name changed. To address this, we simply always reference the package driver as storagedriver to avoid compatbility issues with existing code. While unfortunate, this can be cleaned up over time. Signed-off-by: Stephen J Day <stephen.day@docker.com>
71 lines
2.7 KiB
Go
71 lines
2.7 KiB
Go
package factory
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import (
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"fmt"
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storagedriver "github.com/docker/distribution/registry/storage/driver"
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)
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// driverFactories stores an internal mapping between storage driver names and their respective
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// factories
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var driverFactories = make(map[string]StorageDriverFactory)
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// StorageDriverFactory is a factory interface for creating storagedriver.StorageDriver interfaces
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// Storage drivers should call Register() with a factory to make the driver available by name
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type StorageDriverFactory interface {
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// Create returns a new storagedriver.StorageDriver with the given parameters
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// Parameters will vary by driver and may be ignored
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// Each parameter key must only consist of lowercase letters and numbers
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Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error)
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}
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// Register makes a storage driver available by the provided name.
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// If Register is called twice with the same name or if driver factory is nil, it panics.
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func Register(name string, factory StorageDriverFactory) {
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if factory == nil {
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panic("Must not provide nil StorageDriverFactory")
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}
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_, registered := driverFactories[name]
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if registered {
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panic(fmt.Sprintf("StorageDriverFactory named %s already registered", name))
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}
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driverFactories[name] = factory
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}
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// Create a new storagedriver.StorageDriver with the given name and parameters
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// To run in-process, the StorageDriverFactory must first be registered with the given name
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// If no in-process drivers are found with the given name, this attempts to create an IPC driver
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// If no in-process or external drivers are found, an InvalidStorageDriverError is returned
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func Create(name string, parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
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driverFactory, ok := driverFactories[name]
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if !ok {
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return nil, InvalidStorageDriverError{name}
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// NOTE(stevvooe): We are disabling storagedriver ipc for now, as the
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// server and client need to be updated for the changed API calls and
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// there were some problems libchan hanging. We'll phase this
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// functionality back in over the next few weeks.
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// No registered StorageDriverFactory found, try ipc
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// driverClient, err := ipc.NewDriverClient(name, parameters)
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// if err != nil {
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// return nil, InvalidStorageDriverError{name}
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// }
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// err = driverClient.Start()
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// if err != nil {
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// return nil, err
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// }
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// return driverClient, nil
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}
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return driverFactory.Create(parameters)
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}
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// InvalidStorageDriverError records an attempt to construct an unregistered storage driver
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type InvalidStorageDriverError struct {
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Name string
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}
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func (err InvalidStorageDriverError) Error() string {
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return fmt.Sprintf("StorageDriver not registered: %s", err.Name)
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}
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