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// Copyright 2016 VMware, Inc. All Rights Reserved.
//
// 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 rpcout
import (
"errors"
"fmt"
"github.com/vmware/vmw-guestinfo/message"
)
// ErrRpciFormat represents an invalid result format
var ErrRpciFormat = errors.New("invalid format for RPCI command result")
const rpciProtocolNum uint32 = 0x49435052
// SendOne is a command-oriented wrapper for SendOneRaw
func SendOne(format string, a ...interface{}) (reply []byte, ok bool, err error) {
request := fmt.Sprintf(format, a...)
return SendOneRaw([]byte(request))
}
// SendOneRaw uses a throw-away RPCOut to send a request
func SendOneRaw(request []byte) (reply []byte, ok bool, err error) {
out := &RPCOut{}
if err = out.Start(); err != nil {
return
}
if reply, ok, err = out.Send(request); err != nil {
return
}
if err = out.Stop(); err != nil {
return
}
return
}
// RPCOut is an ougoing connection from the VM to the hypervisor
type RPCOut struct {
channel *message.Channel
}
// Start opens the connection
func (out *RPCOut) Start() error {
channel, err := message.NewChannel(rpciProtocolNum)
if err != nil {
return err
}
out.channel = channel
return nil
}
// Stop closes the connection
func (out *RPCOut) Stop() error {
err := out.channel.Close()
out.channel = nil
return err
}
// Send emits a request and receives a response
func (out *RPCOut) Send(request []byte) (reply []byte, ok bool, err error) {
if err = out.channel.Send(request); err != nil {
return
}
var resp []byte
if resp, err = out.channel.Receive(); err != nil {
return
}
switch string(resp[:2]) {
case "0 ":
reply = resp[2:]
case "1 ":
reply = resp[2:]
ok = true
default:
err = ErrRpciFormat
}
return
}
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