forked from distribution/distribution
-
Notifications
You must be signed in to change notification settings - Fork 2
/
middleware.go
40 lines (31 loc) · 1.25 KB
/
middleware.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
package middleware
import (
"fmt"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
)
// 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)
}