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// Copyright 2016 The go-qemu Authors.
//
// 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 qemu_test
import (
"fmt"
"log"
"github.com/digitalocean/go-qemu/qemu"
"github.com/digitalocean/go-qemu/qmp"
"github.com/digitalocean/go-qemu/qmp/qmptest"
)
// This example demonstrates how to use qemu.NewDomain with a qmp.Monitor to
// perform actions on a Domain.
//
// Typically, these actions would be performed using an actual monitor of type
// qmp.LibvirtRPCMonitor or qmp.SocketMonitor, instead of using
// qmptest.NewMonitor.
func ExampleNewDomain() {
// Use qmptest.NewMonitor to create an "example" qmp.Monitor, that returns
// mock data from another function.
//
// Normally, qmp.NewLibvirtRPCMonitor or qmp.NewSocketMonitor would be used
// here instead.
mon := qmptest.NewMonitor(func(cmd qmp.Command) (interface{}, error) {
return exampleRun(cmd)
})
// Monitor must be connected before it can be used.
if err := mon.Connect(); err != nil {
log.Fatalf("failed to connect monitor: %v", err)
}
// Wrap monitor in a qemu.Domain to perform higher-level management actions.
dom, err := qemu.NewDomain(mon, "example")
if err != nil {
log.Fatalf("failed to create domain: %v", err)
}
// Return the domain's QEMU version.
version, err := dom.Version()
if err != nil {
log.Fatalf("failed to check domain QEMU version: %v", err)
}
// List the available QMP commands supported by the domain.
commands, err := dom.Commands()
if err != nil {
log.Fatalf("failed to list domain commands: %v", err)
}
// Print some information about the domain.
fmt.Printf("%s - QEMU %s\n", dom.Name, version)
fmt.Println(" - commands:")
for _, c := range commands {
fmt.Printf(" - %s\n", c)
}
// Close the domain to clean up its resources and underlying monitor.
if err := dom.Close(); err != nil {
log.Fatalf("failed to close domain: %v", err)
}
// Output:
// example - QEMU 2.0.0
// - commands:
// - query-block
// - query-commands
// - query-version
}
func exampleRun(cmd qmp.Command) (interface{}, error) {
switch cmd.Execute {
case "query-commands":
return runQueryCommands(), nil
case "query-version":
return runQueryVersion(), nil
}
return nil, fmt.Errorf("unknown command: %q", cmd.Execute)
}
func runQueryCommands() interface{} {
var response struct {
ID string `json:"id"`
Return []nameWrapper `json:"return"`
}
commands := []string{
"query-block",
"query-commands",
"query-version",
}
response.Return = make([]nameWrapper, 0, len(commands))
for _, c := range commands {
response.Return = append(response.Return, nameWrapper{
Name: c,
})
}
return response
}
func runQueryVersion() interface{} {
var response struct {
ID string `json:"id"`
Return qmp.Version `json:"return"`
}
response.Return.QEMU.Major = 2
return response
}
type nameWrapper struct {
Name string `json:"name"`
}
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