namespacer.go at master ⋅ aporeto-inc/elemental

package elemental

import "net/http"

// Namespacer is the interface that any namespace extraction/injection
// implementation should support.
type Namespacer interface {
	Extract(r *http.Request) (string, error)
	Inject(r *http.Request, namespace string) error
}

var (
	namespacer = Namespacer(&defaultNamespacer{})
)

type defaultNamespacer struct{}

// defaultExtractor will retrieve the namespace value from the header X-Namespace.
func (d *defaultNamespacer) Extract(r *http.Request) (string, error) {
	return r.Header.Get("X-Namespace"), nil
}

// defaultInjector will set the namespace as an HTTP header.
func (d *defaultNamespacer) Inject(r *http.Request, namespace string) error {
	if r.Header == nil {
		r.Header = http.Header{}
	}
	r.Header.Set("X-Namespace", namespace)
	return nil
}

// SetNamespacer will configure the package. It must be only called once
// and it is global for the package.
func SetNamespacer(custom Namespacer) {
	namespacer = custom
}

// GetNamespacer retrieves the configured namespacer.
func GetNamespacer() Namespacer {
	return namespacer
}

1		package elemental
2
3		import "net/http"
4
5		// Namespacer is the interface that any namespace extraction/injection
6		// implementation should support.
7		type Namespacer interface {
8		Extract(r *http.Request) (string, error)
9		Inject(r *http.Request, namespace string) error
10		}
11
12		var (
13		namespacer = Namespacer(&defaultNamespacer{})
14		)
15
16		type defaultNamespacer struct{}
17
18		// defaultExtractor will retrieve the namespace value from the header X-Namespace.
19		func (d defaultNamespacer) Extract(r http.Request) (string, error) {
20	14	return r.Header.Get("X-Namespace"), nil
21		}
22
23		// defaultInjector will set the namespace as an HTTP header.
24		func (d defaultNamespacer) Inject(r http.Request, namespace string) error {
25	14	if r.Header == nil {
26	14	r.Header = http.Header{}
27		}
28	14	r.Header.Set("X-Namespace", namespace)
29	14	return nil
30		}
31
32		// SetNamespacer will configure the package. It must be only called once
33		// and it is global for the package.
34		func SetNamespacer(custom Namespacer) {
35	14	namespacer = custom
36		}
37
38		// GetNamespacer retrieves the configured namespacer.
39		func GetNamespacer() Namespacer {
40	14	return namespacer
41		}

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