/
messages.go
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/
messages.go
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/*
* Copyright (c) 2017 Open Baton (http://openbaton.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package messages
import "github.com/openbaton/go-openbaton/catalogue"
import "fmt"
type NFVMessage interface {
Action() catalogue.Action
Content() interface{}
From() SenderType
}
// New creates dynamically a new NFVMessage from the given parameters.
// The function accepts a message body and an optional catalogue.Action before, such as in
// messages.NewMessage(catalogue.ActionError, &VNFMError{}).
// If no Action is specified, it is inferred using the DefaultAction() method of the body.
func New(params ...interface{}) (NFVMessage, error) {
action := catalogue.NoActionSpecified
var content body
switch len(params) {
case 1:
if castContent, ok := params[0].(body); ok {
content = castContent
} else {
return nil, fmt.Errorf("got %T, expected a valid message body type", params[0])
}
action = content.DefaultAction()
case 2:
if castAction, ok := params[0].(catalogue.Action); ok {
action = castAction
} else {
return nil, fmt.Errorf("got %T, expected catalogue.Action", params[0])
}
if castContent, ok := params[1].(body); ok {
content = castContent
} else {
return nil, fmt.Errorf("got %T, expected a valid message body type", params[1])
}
default:
return nil, fmt.Errorf("wrong number of parameters for NewMessage(): %d", len(params))
}
return &message{
action: action,
content: content,
}, nil
}
// SenderType represents the type of the sender of the
// given message
type SenderType int
const (
VNFM SenderType = iota
NFVO
)
type body interface {
DefaultAction() catalogue.Action
From() SenderType
}
type message struct {
action catalogue.Action
content body
from SenderType
}
func (msg *message) Action() catalogue.Action {
return msg.action
}
func (msg *message) Content() interface{} {
return msg.content
}
func (msg *message) From() SenderType {
return msg.from
}