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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 hypervisor_test
import (
"fmt"
"log"
"github.com/digitalocean/go-qemu/hypervisor"
"github.com/digitalocean/go-qemu/qmp"
"github.com/digitalocean/go-qemu/qmp/qmptest"
)
func ExampleNew() {
// Create a hypervisor.Hypervisor using an in-memory hypervisor.Driver,
// that returns a fixed list of three domains.
hv := hypervisor.New(newDriver([]string{
"foo",
"bar",
"baz",
}))
// Connect to the monitor socket of each domain using the in-memory driver.
domains, err := hv.Domains()
if err != nil {
log.Fatalf("failed to connect to domains: %v", err)
}
fmt.Println("hypervisor:")
for _, d := range domains {
// Return the domain's QEMU version.
version, err := d.Version()
if err != nil {
log.Fatalf("failed to check domain QEMU version: %v", err)
}
// Print some information about the domain.
fmt.Printf(" - %s - QEMU %s\n", d.Name, version)
// Close the domain to clean up its resources and underlying monitor.
if err := d.Close(); err != nil {
log.Fatalf("failed to close domain: %v", err)
}
}
// Output:
// hypervisor:
// - foo - QEMU 2.0.0
// - bar - QEMU 2.0.1
// - baz - QEMU 2.0.2
}
var _ hypervisor.Driver = &driver{}
func newDriver(domains []string) *driver {
return &driver{
domains: domains,
}
}
type driver struct {
domains []string
}
func (d *driver) NewMonitor(domain string) (qmp.Monitor, error) {
m := qmptest.NewMonitor(func(cmd qmp.Command) (interface{}, error) {
return run(domain, cmd)
})
return m, nil
}
func (d *driver) DomainNames() ([]string, error) {
return d.domains, nil
}
func run(domain string, cmd qmp.Command) (interface{}, error) {
switch cmd.Execute {
case "query-version":
return runQueryVersion(domain), nil
}
return nil, fmt.Errorf("unknown command: %q", cmd.Execute)
}
func runQueryVersion(domain string) interface{} {
var response struct {
ID string `json:"id"`
Return qmp.Version `json:"return"`
}
response.Return.QEMU.Major = 2
switch domain {
case "bar":
response.Return.QEMU.Micro = 1
case "baz":
response.Return.QEMU.Micro = 2
}
return response
}
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