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94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
// Copyright 2016 VMware, Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rpcout
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import (
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"errors"
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"fmt"
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"github.com/vmware/vmw-guestinfo/message"
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)
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// ErrRpciFormat represents an invalid result format
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var ErrRpciFormat = errors.New("invalid format for RPCI command result")
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const rpciProtocolNum uint32 = 0x49435052
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// SendOne is a command-oriented wrapper for SendOneRaw
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func SendOne(format string, a ...interface{}) (reply []byte, ok bool, err error) {
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request := fmt.Sprintf(format, a...)
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return SendOneRaw([]byte(request))
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}
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// SendOneRaw uses a throw-away RPCOut to send a request
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func SendOneRaw(request []byte) (reply []byte, ok bool, err error) {
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out := &RPCOut{}
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if err = out.Start(); err != nil {
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return
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}
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if reply, ok, err = out.Send(request); err != nil {
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return
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}
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if err = out.Stop(); err != nil {
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return
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}
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return
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}
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// RPCOut is an ougoing connection from the VM to the hypervisor
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type RPCOut struct {
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channel *message.Channel
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}
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// Start opens the connection
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func (out *RPCOut) Start() error {
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channel, err := message.NewChannel(rpciProtocolNum)
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if err != nil {
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return err
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}
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out.channel = channel
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return nil
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}
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// Stop closes the connection
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func (out *RPCOut) Stop() error {
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err := out.channel.Close()
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out.channel = nil
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return err
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}
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// Send emits a request and receives a response
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func (out *RPCOut) Send(request []byte) (reply []byte, ok bool, err error) {
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if err = out.channel.Send(request); err != nil {
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return
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}
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var resp []byte
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if resp, err = out.channel.Receive(); err != nil {
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return
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}
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switch string(resp[:2]) {
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case "0 ":
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reply = resp[2:]
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case "1 ":
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reply = resp[2:]
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ok = true
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default:
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err = ErrRpciFormat
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}
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return
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}
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