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package middleware
import (
"context"
"fmt"
"github.com/docker/distribution"
)
// InitFunc is the type of a RepositoryMiddleware factory function and is
// used to register the constructor for different RepositoryMiddleware backends.
type InitFunc func(ctx context.Context, repository distribution.Repository, options map[string]interface{}) (distribution.Repository, error)
var middlewares map[string]InitFunc
// Register is used to register an InitFunc for
// a RepositoryMiddleware backend with the given name.
func Register(name string, initFunc InitFunc) error {
if middlewares == nil {
middlewares = make(map[string]InitFunc)
}
if _, exists := middlewares[name]; exists {
return fmt.Errorf("name already registered: %s", name)
}
middlewares[name] = initFunc
return nil
}
// Get constructs a RepositoryMiddleware with the given options using the named backend.
func Get(ctx context.Context, name string, options map[string]interface{}, repository distribution.Repository) (distribution.Repository, error) {
if middlewares != nil {
if initFunc, exists := middlewares[name]; exists {
return initFunc(ctx, repository, options)
}
}
return nil, fmt.Errorf("no repository middleware registered with name: %s", name)
}
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