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

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