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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 provides management facilities for one or more QEMU
// virtual machines on a hypervisor.
package hypervisor
import (
"fmt"
"github.com/digitalocean/go-qemu/qemu"
"github.com/digitalocean/go-qemu/qmp"
)
// A Hypervisor enables access to all virtual machines on a QEMU hypervisor.
type Hypervisor struct {
// Driver used to communicate with domains
driver Driver
}
// New creates a new Hypervisor using the input Driver.
func New(driver Driver) *Hypervisor {
return &Hypervisor{
driver: driver,
}
}
// A Driver is a QEMU QMP monitor driver that a Hypervisor can use to perform
// actions on groups of virtual machines.
type Driver interface {
NewMonitor(domain string) (qmp.Monitor, error)
DomainNames() ([]string, error)
}
// A Versioner is a Driver that is able to report its version on the
// Hypervisor.
type Versioner interface {
Version() (string, error)
}
// Domains retrieves all virtual machines which reside on a given hypervisor,
// connecting to the monitor socket of each machine.
//
// Each Domain's Close method must be called to clean up its resources when
// they are no longer needed.
func (hv *Hypervisor) Domains() ([]*qemu.Domain, error) {
domains, err := hv.driver.DomainNames()
if err != nil {
return nil, err
}
ds := make([]*qemu.Domain, 0, len(domains))
for _, d := range domains {
domain, err := hv.connectDomain(d)
if err != nil {
return nil, err
}
ds = append(ds, domain)
}
return ds, nil
}
// Domain retrieves a single virtual machine from a hypervisor, connecting to
// its monitor socket. If no virtual machine exists with the given name, an
// error is returned.
//
// The Domain's Close method must be called to clean up its resources when
// they are no longer needed.
func (hv *Hypervisor) Domain(name string) (*qemu.Domain, error) {
domains, err := hv.driver.DomainNames()
if err != nil {
return nil, err
}
for _, d := range domains {
if d == name {
return hv.connectDomain(name)
}
}
return nil, fmt.Errorf("domain %q not found", name)
}
// DomainNames retrieves the names of all virtual machines which reside on
// a given hypervisor, so that individual connections can be opened using
// the Domain method, as needed.
func (hv *Hypervisor) DomainNames() ([]string, error) {
return hv.driver.DomainNames()
}
// connectDomain opens a monitor socket connection and creates a virtual
// machine for the machine with the specified name.
func (hv *Hypervisor) connectDomain(name string) (*qemu.Domain, error) {
mon, err := hv.driver.NewMonitor(name)
if err != nil {
return nil, err
}
if err := mon.Connect(); err != nil {
return nil, err
}
return qemu.NewDomain(mon, name)
}
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