1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
// 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
import (
"net"
"github.com/digitalocean/go-libvirt"
"github.com/digitalocean/go-qemu/qmp"
)
var _ Driver = &RPCDriver{}
var _ Versioner = &RPCDriver{}
// RPCDriver is a QEMU QMP monitor driver which
// communicates via libvirt's RPC interface.
type RPCDriver struct {
newConn func() (net.Conn, error)
}
// DomainNames retrieves all hypervisor domain names using libvirt RPC.
func (d *RPCDriver) DomainNames() ([]string, error) {
var names []string
err := d.withLibvirt(func(l *libvirt.Libvirt) error {
domains, err := l.Domains()
if err != nil {
return err
}
names = make([]string, 0, len(domains))
for _, d := range domains {
names = append(names, d.Name)
}
return nil
})
return names, err
}
// NewMonitor creates a new qmp.Monitor using libvirt RPC.
func (d *RPCDriver) NewMonitor(domain string) (qmp.Monitor, error) {
conn, err := d.newConn()
return qmp.NewLibvirtRPCMonitor(domain, conn), err
}
// Version returns the version string for the libvirt daemon.
func (d *RPCDriver) Version() (string, error) {
var version string
err := d.withLibvirt(func(l *libvirt.Libvirt) error {
v, err := l.Version()
version = v
return err
})
return version, err
}
// NewRPCDriver configures a hypervisor driver using Libvirt RPC.
// The provided newConn function should return an established
// network connection with the target libvirt daemon.
func NewRPCDriver(newConn func() (net.Conn, error)) *RPCDriver {
return &RPCDriver{
newConn: newConn,
}
}
// withLibvirt opens a new RPC connection to Libvirt and invokes the input
// closure using the RPC connection. Connections are automatically cleaned
// up when the close returns.
func (d *RPCDriver) withLibvirt(fn func(l *libvirt.Libvirt) error) error {
conn, err := d.newConn()
if err != nil {
return err
}
l := libvirt.New(conn)
if err := l.Connect(); err != nil {
_ = conn.Close()
return err
}
defer func() {
_ = l.Disconnect()
}()
return fn(l)
}
|
