/
register.go
68 lines (55 loc) · 1.85 KB
/
register.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
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
package plugin
import (
"fmt"
"io"
"github.com/devopsfaith/krakend/encoding"
"github.com/devopsfaith/krakend/register"
"github.com/devopsfaith/krakend/sd"
)
// REGISTRABLE_VAR is the name to lookup after loading the plugin for the module registering
const REGISTRABLE_VAR = "Registrable"
// Register contains all the registers required by the framework and the external modules
type Register struct {
Decoder *encoding.DecoderRegister
SD *sd.Register
External *register.Namespaced
}
// NewRegister returns a new register to be used by the plugin loader
func NewRegister() *Register {
return &Register{
Decoder: encoding.GetRegister(),
SD: sd.GetRegister(),
External: register.New(),
}
}
// Register registers the received plugin in the proper internal registers
func (r *Register) Register(p Plugin) error {
x, err := p.Lookup(REGISTRABLE_VAR)
if err != nil {
fmt.Println("unable to find the registrable symbol:", err.Error())
return err
}
totalRegistrations := 0
if registrable, ok := x.(RegistrableDecoder); ok {
err = registrable.RegisterDecoder(r.Decoder.Register)
totalRegistrations++
}
if registrable, ok := x.(RegistrableExternal); ok {
err = registrable.RegisterExternal(r.External.Register)
totalRegistrations++
}
if totalRegistrations == 0 {
fmt.Println("unknown registrable interface")
}
return nil
}
// RegistrableDecoder defines the interface the encoding plugins should implement
// in order to be able to register themselves
type RegistrableDecoder interface {
RegisterDecoder(func(name string, dec func(bool) func(io.Reader, *map[string]interface{}) error) error) error
}
// RegistrableExternal defines the interface the external plugins should implement
// in order to be able to register themselves
type RegistrableExternal interface {
RegisterExternal(func(namespace, name string, v interface{})) error
}