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