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more common code 

Signed-off-by: Jeff Carr <jcarr@wit.com>
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Jeff Carr 2024-10-26 10:12:07 -05:00
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This is the common libvirt xml handling code for virtigo & virtigod
This is used to import libvirt xml files (as used by virsh) and
save the information in a protocol buffer config file.
It re-creates the xml files needed for virsh on the hypervisor
and starts the vm with 'virsh create'

390
addDroplet.go Normal file
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@ -0,0 +1,390 @@
// Copyright 2024 WIT.COM Inc Licensed GPL 3.0
package virtigoxml
import (
"encoding/xml"
"errors"
"fmt"
"github.com/google/uuid"
"go.wit.com/log"
"libvirt.org/go/libvirtxml"
pb "go.wit.com/lib/protobuf/virtbuf"
)
// import a libvirt xml file
func AddDomainDroplet(cluster *pb.Cluster, domcfg *libvirtxml.Domain) (*pb.Droplet, []*pb.Event, error) {
var alle []*pb.Event
if domcfg == nil {
return nil, alle, errors.New("domcfg == nil")
}
d, err := findDomain(cluster, domcfg)
if err != nil {
return nil, alle, err
}
if d == nil {
d = cluster.AddDroplet(domcfg.UUID, domcfg.Name, 2, 2*1024*1024)
d.StartState = pb.DropletState_OFF
d.CurrentState = pb.DropletState_UNKNOWN
// if the domcfg doesn't have a uuid, make a new one here
if d.Uuid == "" {
u := uuid.New()
d.Uuid = u.String()
}
}
alle, err = updateDroplet(cluster, d, domcfg)
if err != nil {
log.Info("updateDroplet() failed for", d.Hostname)
return d, alle, errors.New("update failed for " + domcfg.Name)
}
log.Info("added new droplet", domcfg.Name, domcfg.UUID)
DumpNonStandardXML(domcfg)
return d, alle, nil
}
func findDomain(c *pb.Cluster, domcfg *libvirtxml.Domain) (*pb.Droplet, error) {
var found *pb.Droplet
if domcfg == nil {
return nil, errors.New("domcfg == nil")
}
for _, d := range c.Droplets {
if d.Hostname == domcfg.Name {
if d.Uuid != domcfg.UUID {
if domcfg.UUID == "" {
// ignore blank or nonexistent UUID's
// todo: check to see if the uuid already exists ?
domcfg.UUID = d.Uuid
} else {
fmt.Println("Will Change UUID from", d.Uuid, "to", domcfg.UUID, "for hostname", d.Hostname)
d.Uuid = domcfg.UUID
}
}
if found == nil {
found = d
} else {
fmt.Println("FOUND TWICE", d.Uuid, domcfg.Name, domcfg.UUID)
return d, errors.New("Found Twice")
}
}
if d.Uuid == domcfg.UUID {
if d.Hostname != domcfg.Name {
fmt.Println("protobuf has: UUID and Name:", d.Uuid, d.Hostname)
fmt.Println("libvirt has: UUID and Name:", domcfg.UUID, domcfg.Name)
fmt.Println("FOUND UUID WITH MIS-MATCHED NAME", domcfg.Name, domcfg.UUID)
return d, errors.New("UUID with mis-matched names")
}
}
}
return found, nil
}
func updateDroplet(cluster *pb.Cluster, d *pb.Droplet, domcfg *libvirtxml.Domain) ([]*pb.Event, error) {
var alle []*pb.Event
if d == nil {
return alle, errors.New("d == nil")
}
if domcfg == nil {
return alle, errors.New("domcfg == nil")
}
e, err := updateMemory(d, domcfg)
if err != nil {
log.Info("updateMemory() failed")
return alle, err
}
if e != nil {
alle = append(alle, e)
}
// update arch & machine
if (domcfg.OS != nil) && (domcfg.OS.Type != nil) {
// OS Type: &{Arch:x86_64 Machine:pc-i440fx-5.2 Type:hvm}
t := domcfg.OS.Type
if d.QemuArch != t.Arch {
e := d.NewChangeEvent("Droplet.QemuArch", d.QemuArch, t.Arch)
alle = append(alle, e)
d.QemuArch = t.Arch
}
if d.QemuMachine != t.Machine {
e := d.NewChangeEvent("Droplet.QemuMachine", d.QemuMachine, t.Machine)
alle = append(alle, e)
d.QemuMachine = t.Machine
}
}
// check cpus
if d.Cpus != int64(domcfg.VCPU.Value) {
// fmt.Printf("cpus changed. VCPU = %+v\n", domcfg.VCPU)
fmt.Printf("cpus changed. from %d to %d\n", d.Cpus, domcfg.VCPU.Value)
alle = append(alle, d.NewChangeEvent("Droplet.Cpus", d.Cpus, domcfg.VCPU.Value))
d.Cpus = int64(domcfg.VCPU.Value)
}
// update spice port
if domcfg.Devices.Graphics != nil {
for _, g := range domcfg.Devices.Graphics {
if g.Spice == nil {
continue
}
var s *libvirtxml.DomainGraphicSpice
s = g.Spice
// fmt.Printf("Spice: %d %+v %s\n", i, s, s.AutoPort)
if s.AutoPort == "yes" {
// should ignore either way
} else {
if d.SpicePort != int64(s.Port) {
// print out, but ignore the port number
d.SpicePort = int64(s.Port)
fmt.Printf("Spice Port set to = %d\n", s.Port)
alle = append(alle, d.NewChangeEvent("Droplet.SpicePort", d.SpicePort, s.Port))
}
}
}
}
// check type
if domcfg.Type != "kvm" {
fmt.Printf("not kvm. Virt type == %s\n", domcfg.Type)
return alle, errors.New("not kvm")
}
nete, err := updateNetwork(cluster, d, domcfg)
if err != nil {
log.Info("updateNetwork() failed", err)
return alle, err
}
for _, e := range nete {
alle = append(alle, e)
}
nete, err = updateDisk(cluster, d, domcfg)
if err != nil {
return alle, err
}
for _, e := range nete {
alle = append(alle, e)
}
if alle == nil {
log.Info("libvirt xml import worked. nothing changed", domcfg.Name)
return alle, nil
}
log.Info("libvirt xml import worked. droplet changed", domcfg.Name)
// append each change event
for _, e := range alle {
cluster.Events = append(cluster.Events, e)
}
return alle, nil
}
// returns false if something went wrong
func updateMemory(d *pb.Droplet, domcfg *libvirtxml.Domain) (*pb.Event, error) {
if (d == nil) || (domcfg == nil) {
return nil, errors.New("domcfg == nil")
}
if domcfg.Memory == nil {
// nothing to do. libvirt xml file didn't define memory size
return nil, nil
}
var m int64 = 0
switch domcfg.Memory.Unit {
case "KiB":
m = int64(domcfg.Memory.Value * 1024)
case "MiB":
m = int64(domcfg.Memory.Value * 1024 * 1024)
case "GiB":
m = int64(domcfg.Memory.Value * 1024 * 1024 * 1024)
default:
fmt.Println("Unknown Memory Unit", domcfg.Memory.Unit)
return nil, errors.New("Unknown Memory Unit " + domcfg.Memory.Unit)
}
e := d.SetMemory(m)
if e != nil {
fmt.Printf("Memory changed %s to %d %s\n", pb.HumanFormatBytes(d.Memory), domcfg.Memory.Value, domcfg.Memory.Unit)
d.Memory = m
}
return e, nil
}
func updateNetwork(cluster *pb.Cluster, d *pb.Droplet, domcfg *libvirtxml.Domain) ([]*pb.Event, error) {
var allEvents []*pb.Event
if (d == nil) || (domcfg == nil) {
return nil, errors.New("domcfg == nil")
}
// mac address & bridge name
var macs map[string]string
macs = make(map[string]string)
// Iterate over the network interfaces and print the MAC addresses
for _, iface := range domcfg.Devices.Interfaces {
var hwaddr string
var brname string
// fmt.Printf("iface: %+v\n", iface)
// fmt.Printf("MAC: %+v\n", iface.MAC)
// fmt.Printf("Source: %+v\n", iface.Source)
// fmt.Printf("Bridge: %+v\n", iface.Source.Bridge)
// fmt.Printf("Model: %+v\n", iface.Model)
if iface.MAC != nil {
// iface.MAC.Address = "aa:bb:aa:bb:aa:ff"
// log.Info("Interface:", iface.Target, "MAC Address:", iface.MAC.Address)
// fmt.Printf("source: %+v\n", iface.Source)
hwaddr = iface.MAC.Address
}
if iface.Source == nil {
// fmt.Printf("non-standard network: %+v\n", iface)
updatedXML, _ := xml.MarshalIndent(domcfg.Devices.Interfaces, "", " ")
log.Info("Non-Standard Network XML Start")
fmt.Println(string(updatedXML))
log.Info("Non-Standard Network XML End")
return nil, errors.New("non-standard network. source == nil")
}
if iface.Source.Bridge == nil {
if hwaddr == "" {
fmt.Printf("non-standard network: %+v\n", iface)
updatedXML, _ := xml.MarshalIndent(domcfg.Devices.Interfaces, "", " ")
log.Info("Non-Standard Network XML Start")
fmt.Println(string(updatedXML))
log.Info("Non-Standard Network XML End")
return nil, errors.New("bridge is nil and no mac address")
}
brname = ""
} else {
if iface.Source.Bridge.Bridge == "" {
if hwaddr == "" {
fmt.Printf("non-standard network: %+v\n", iface)
fmt.Printf("iface.Mac: %+v\n", iface)
updatedXML, _ := xml.MarshalIndent(domcfg.Devices.Interfaces, "", " ")
log.Info("Non-Standard Network XML Start")
fmt.Println(string(updatedXML))
log.Info("Non-Standard Network XML End")
return nil, errors.New("bridge is blank and no mac address")
}
brname = iface.Source.Bridge.Bridge
}
}
// log.Info("network has bridge:", iface.Source.Bridge.Bridge)
if hwaddr == "" {
hwaddr = "generate " + domcfg.Name
log.Info("need to generate mac addr for bridge:", brname)
// return nil, errors.New("need to generate mac addr for bridge: " + brname)
}
macs[hwaddr] = brname
}
for mac, brname := range macs {
var found bool = false
// log.Info("XML has mac address:", mac, brname)
for _, eth := range d.Networks {
if eth.Mac == mac {
// log.Info("OKAY. FOUND ETH:", eth.Mac, eth.Name, brname)
found = true
if brname == "" {
// if new bridge name is blank, keep the old one
brname = eth.Name
}
if eth.Name != brname {
// if argv.IgnoreBr {
log.Info("network was:", eth.Mac, eth.Name)
log.Info("network now:", eth.Mac, brname)
log.Info("ignoring network change (--xml-ignore-net)")
// } else {
// return nil, errors.New("bridge name changed")
// }
}
}
}
if !found {
if CheckUniqueMac(cluster, mac) {
} else {
log.Info("droplet", d.Hostname, "duplicate mac address", mac)
return nil, errors.New("duplicate mac address")
}
var eth *pb.Network
eth = new(pb.Network)
eth.Mac = mac
if brname == "" {
brname = "worldbr"
}
eth.Name = brname
d.Networks = append(d.Networks, eth)
allEvents = append(allEvents, d.NewChangeEvent("Droplet NewNetwork", "", mac+" "+brname))
}
}
log.Verbose("mac addrs:", macs)
return allEvents, nil
}
/* from vm3-with-nvme-1.5GB-sec.xml
<disk type='block' device='disk'>
<driver name='qemu' type='raw'/>
<source dev='/dev/nvme4n1'/>
<backingStore/>
<target dev='vdb' bus='virtio'/>
<alias name='virtio-disk1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
*/
// returns false if something went wrong
func updateDisk(cluster *pb.Cluster, d *pb.Droplet, domcfg *libvirtxml.Domain) ([]*pb.Event, error) {
var alle []*pb.Event
if (d == nil) || (domcfg == nil) {
return nil, errors.New("domcfg == nil")
}
for _, disk := range domcfg.Devices.Disks {
var t *libvirtxml.DomainDiskSourceFile
t = disk.Source.File
if t == nil {
fmt.Println("disk.Source.File == nil")
continue
}
filename := t.File
if filename == "" {
fmt.Println("No disk source file found.")
continue
}
e, err := insertFilename(cluster, d, filename)
if err != nil {
return alle, err
}
if e == nil {
continue
}
alle = append(alle, e)
/*
var found bool = false
for _, disk := range d.Disks {
if disk.Filename == filename {
log.Verbose("OKAY. FOUND filename", filename)
found = true
}
}
if !found {
var disk *pb.Disk
disk = new(pb.Disk)
disk.Filename = filename
d.Disks = append(d.Disks, disk)
log.Info("New filename", filename)
}
*/
}
return alle, nil
}

3
libvirtxml.go
View File

@ -215,8 +215,7 @@ func addEthernetTap(domcfg *libvirtxml.Domain, mac string) {
who don't have bridge groups or proper cluster backend networking
literally leaving this blank makes the interface 'tap0'
*/
Target: &libvirtxml.DomainInterfaceTarget{
},
Target: &libvirtxml.DomainInterfaceTarget{},
}
// Add the new disk to the domain configuration

2
start.go
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@ -9,8 +9,8 @@ import (
"libvirt.org/go/libvirtxml"
"go.wit.com/log"
pb "go.wit.com/lib/protobuf/virtbuf"
"go.wit.com/log"
)
// generate the XML for 'virsh create'

220
validate.go Normal file
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@ -0,0 +1,220 @@
package virtigoxml
/*
validate / sanity check / consistancy check the data
here is some code to do smart things like:
* check mac addresses are unique
* check uuid's are unique
* double check filenames are unique
* return a unique mac address
* return a unique uuid
*/
import (
"errors"
"os"
"path/filepath"
"github.com/google/uuid"
pb "go.wit.com/lib/protobuf/virtbuf"
"go.wit.com/log"
)
// will make sure the mac address is unique
func CheckUniqueMac(cluster *pb.Cluster, mac string) bool {
for _, d := range cluster.Droplets {
for _, n := range d.Networks {
if n.Mac == mac {
log.Info("duplicate MAC", n.Mac, "in droplet", d.Hostname)
return false
}
}
}
return true
}
// records all the known paths. this should go in the protobuf
func addClusterFilepath(cluster *pb.Cluster, dir string) *pb.Event {
var found bool = false
var e *pb.Event
for _, d := range cluster.Dirs {
if d == dir {
// found dir
found = true
break
}
}
if !found {
if dir != "." {
// make a new Add Event
e = pb.NewAddEvent(nil, "Add Cluster Directory", dir)
cluster.Dirs = append(cluster.Dirs, dir)
}
}
return e
}
// returns the droplet using a filename
func lookupFilename(cluster *pb.Cluster, filename string) *pb.Droplet {
filebase := filepath.Base(filename)
for _, d := range cluster.Droplets {
for _, disk := range d.Disks {
if filebase == disk.Filename {
return d
}
}
}
return nil
}
func insertFilename(cluster *pb.Cluster, d *pb.Droplet, filename string) (*pb.Event, error) {
dupd := lookupFilename(cluster, filename)
if dupd != nil {
log.Info("file", filename, "already on droplet", dupd.Hostname)
log.Info("file", filename, "on new droplet", d.Hostname)
if os.Getenv("VIRTIGO_IGNORE_DISKDUP") == "" {
log.Info("duplicate disk names (--xml-ignore-disk to ignore)")
return nil, errors.New("duplicate disk names")
} else {
log.Info("ignore duplicate disk names (--xml-ignore-disk=true)")
}
}
filebase := filepath.Base(filename)
dir := filepath.Dir(filename)
for _, disk := range d.Disks {
if disk.Filename == filebase {
log.Info("already have disk", filename)
return nil, nil
}
}
// make a new Add Event
e := d.NewChangeEvent("Add Disk", "", filename)
// add the disk protobuf entry
var disk *pb.Disk
disk = new(pb.Disk)
disk.Filename = filebase
disk.Filepath = dir
d.Disks = append(d.Disks, disk)
log.Info("New filename", filebase, dir)
return e, nil
}
func checkUniqueFilenames(cluster *pb.Cluster) bool {
var ok bool = true
var disks map[string]string
disks = make(map[string]string)
for _, d := range cluster.Droplets {
for _, disk := range d.Disks {
filename := disk.Filename
addClusterFilepath(cluster, disk.Filepath)
if _, ok := disks[filename]; ok {
/*
if argv.IgnDisk {
log.Info("ignore dup disk", filename, disks[filename], d.Hostname)
} else {
}
*/
log.Info("file", filename, "on droplet", disks[filename])
log.Info("file", filename, "on droplet", d.Hostname)
log.Info("duplicate disk names (--xml-ignore-disk to ignore)")
ok = false
}
disks[filename] = d.Hostname
}
}
if ok {
log.Println("validated okay: no duplicate disk images")
}
return ok
}
func checkDiskFilenames(cluster *pb.Cluster) []*pb.Event {
var alle []*pb.Event
for _, d := range cluster.Droplets {
for _, disk := range d.Disks {
filename := disk.Filename
filebase := filepath.Base(filename)
dir := filepath.Dir(filename)
addClusterFilepath(cluster, dir)
if disk.Filename != filebase {
// update filename
e := d.NewChangeEvent("Disk.Filename", disk.Filename, filebase)
alle = append(alle, e)
disk.Filename = filebase
}
if dir == "." {
continue
}
if dir == "" {
continue
}
if disk.Filepath != dir {
// update filename
e := d.NewChangeEvent("Disk.Filepath", disk.Filepath, dir)
alle = append(alle, e)
disk.Filepath = dir
}
}
}
return alle
}
func checkDroplets(cluster *pb.Cluster, dump bool) bool {
// uuid map to check for duplicates
var umap map[string]string
umap = make(map[string]string)
// mac address map to check for duplicates
var macs map[string]string
macs = make(map[string]string)
for _, d := range cluster.Droplets {
// Generate a new UUID
if d.Uuid == "" {
u := uuid.New()
d.Uuid = u.String()
}
// seconds, ok := timeZone[tz]; ok {
if _, ok := umap[d.Uuid]; ok {
// UUID already exists
log.Info("duplicate UUID", d.Uuid, umap[d.Uuid])
log.Info("duplicate UUID", d.Uuid, d.Hostname)
os.Exit(-1)
}
umap[d.Uuid] = d.Hostname
for _, n := range d.Networks {
// log.Println("network:", n.Mac, d.Uuid, d.Hostname)
if _, ok := macs[n.Mac]; ok {
// UUID already exists
log.Info("duplicate MAC", n.Mac, macs[n.Mac], umap[macs[n.Mac]])
log.Info("duplicate MAC", n.Mac, d.Hostname)
os.Exit(-1)
}
macs[n.Mac] = d.Uuid
}
}
log.Println("validated okay: no duplicate MAC addr")
log.Println("validated okay: no duplicate UUID")
if dump {
for u, hostname := range umap {
log.Println("uuid:", u, "hostname:", hostname)
}
for mac, uuid := range macs {
log.Println("mac:", mac, "uuid", uuid, "hostname:", umap[uuid])
}
}
return false
}