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vim_mgmt_invoke.go
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vim_mgmt_invoke.go
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package mgmt
import (
"encoding/json"
"errors"
"time"
"github.com/openbaton/go-openbaton/catalogue"
"github.com/openbaton/go-openbaton/util"
"github.com/streadway/amqp"
)
// VIMConnector is a client for a remote VIM instance.
// Its methods mirror those of Handler; invoking one of them
// actually invokes the method on the remote handler.
type VIMConnector interface {
AddMetadata(id string, entries map[string]string) error
Check(id string) (*catalogue.Server, error)
Start(id string) error
}
// NewConnector creates a new Connector to the Manager for the given VIM instance.
func NewConnector(vimname string, acc AMQPChannelAccessor) VIMConnector {
return conn{
acc: cachingAccessor(acc),
id: makeID(vimname),
}
}
// concrete conn type.
type conn struct {
acc AMQPChannelAccessor
id string
}
func (c conn) AddMetadata(id string, entries map[string]string) error {
resp, err := c.request(fnAddMetadata, addMetadataParams{
ID: id,
Entries: entries,
})
if err != nil {
return err
}
if resp.Error != "" {
return errors.New(resp.Error)
}
return nil
}
func (c conn) Check(id string) (*catalogue.Server, error) {
resp, err := c.request(fnCheck, checkParams(id))
if err != nil {
return nil, err
}
if resp.Error != "" {
return nil, errors.New(resp.Error)
}
var srv *catalogue.Server
if err := json.Unmarshal(resp.Value, &srv); err != nil {
return nil, err
}
return srv, nil
}
func (c conn) Start(id string) error {
resp, err := c.request(fnStart, startParams(id))
if err != nil {
return err
}
if resp.Error != "" {
return errors.New(resp.Error)
}
return nil
}
// exchange does an RPC call to the Manager.
func (c conn) exchange(req []byte) ([]byte, error) {
acnl, err := c.acc()
if err != nil {
return nil, err
}
// check if the wanted queue exists.
if _, err := acnl.QueueInspect(c.id); err != nil {
return nil, err
}
queue, err := acnl.QueueDeclare(
"", // name
false, // durable
false, // delete when unused
true, // exclusive
false, // noWait
nil, // arguments
)
if err != nil {
return nil, err
}
deliveries, err := acnl.Consume(
queue.Name, // queue
"", // consumer
true, // auto-ack
false, // exclusive
false, // no-local
false, // no-wait
nil, // args
)
if err != nil {
return nil, err
}
corrID := util.GenerateID()
err = acnl.Publish(
MgmtExchange,
c.id,
false,
false,
amqp.Publishing{
ContentType: "text/plain",
CorrelationId: corrID,
ReplyTo: queue.Name,
Body: req,
},
)
if err != nil {
return nil, err
}
timeout := time.After(DefaultTimeout)
DeliveryLoop:
for {
select {
case <-timeout:
break DeliveryLoop
case delivery, ok := <-deliveries:
if !ok {
break DeliveryLoop
}
if delivery.CorrelationId == corrID {
return delivery.Body, nil
}
}
}
return nil, errors.New("no reply received")
}
// request marshals the request, does the RPC call and unmarshals the response.
func (c conn) request(fn string, params interface{}) (response, error) {
sparams, err := json.Marshal(params)
if err != nil {
return response{}, err
}
sreq, err := json.Marshal(request{Func: fn, Params: sparams})
if err != nil {
return response{}, err
}
sresp, err := c.exchange(sreq)
if err != nil {
return response{}, err
}
var resp response
if err := json.Unmarshal(sresp, &resp); err != nil {
return response{}, err
}
return resp, nil
}