41 lines
1.4 KiB
Go
41 lines
1.4 KiB
Go
package storagemiddleware
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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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// InitFunc is the type of a StorageMiddleware factory function and is
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// used to register the contsructor for different StorageMiddleware backends.
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type InitFunc func(storageDriver storagedriver.StorageDriver, options map[string]interface{}) (storagedriver.StorageDriver, error)
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var storageMiddlewares map[string]InitFunc
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// RegisterStorageMiddleware is used to register an StorageMiddlewareInitFunc for
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// a StorageMiddleware backend with the given name.
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func RegisterStorageMiddleware(name string, initFunc InitFunc) error {
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if storageMiddlewares == nil {
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storageMiddlewares = make(map[string]InitFunc)
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}
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if _, exists := storageMiddlewares[name]; exists {
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return fmt.Errorf("name already registered: %s", name)
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}
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storageMiddlewares[name] = initFunc
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return nil
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}
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// GetStorageMiddleware constructs a StorageMiddleware
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// with the given options using the named backend.
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func GetStorageMiddleware(name string, options map[string]interface{}, storageDriver storagedriver.StorageDriver) (storagedriver.StorageDriver, error) {
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if storageMiddlewares != nil {
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if initFunc, exists := storageMiddlewares[name]; exists {
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return initFunc(storageDriver, options)
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}
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}
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return nil, fmt.Errorf("no storage middleware registered with name: %s", name)
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}
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