mirror of
https://code.dumpstack.io/tools/appvm.git
synced 2024-11-26 14:13:01 +00:00
410 lines
10 KiB
Go
410 lines
10 KiB
Go
/**
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* @author Mikhail Klementev jollheef<AT>riseup.net
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* @license GNU GPLv3
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* @date July 2018
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* @brief appvm launcher
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*/
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package main
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import (
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"syscall"
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"time"
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"github.com/digitalocean/go-libvirt"
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"github.com/go-cmd/cmd"
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"github.com/jollheef/go-system"
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"github.com/olekukonko/tablewriter"
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kingpin "gopkg.in/alecthomas/kingpin.v2"
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)
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var xmlTmpl = `
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<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
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<name>%s</name>
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<memory unit='GiB'>2</memory>
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<currentMemory unit='GiB'>1</currentMemory>
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<vcpu>4</vcpu>
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<os>
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<type arch='x86_64' machine='pc-i440fx-2.12'>hvm</type>
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<kernel>%s/kernel</kernel>
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<initrd>%s/initrd</initrd>
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<cmdline>loglevel=4 init=%s/init %s</cmdline>
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</os>
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<features>
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<acpi/>
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</features>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<!-- Graphical console -->
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<graphics type='spice' autoport='yes'>
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<listen type='address'/>
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<image compression='off'/>
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</graphics>
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<!-- Guest additionals support -->
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<channel type='spicevmc'>
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<target type='virtio' name='com.redhat.spice.0'/>
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</channel>
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<!-- Fake (because -snapshot) writeback image -->
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<disk type='file' device='disk'>
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<driver name='qemu' type='qcow2' cache='writeback' error_policy='report'/>
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<source file='%s'/>
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<target dev='vda' bus='virtio'/>
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</disk>
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<video>
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<model type='qxl' ram='524288' vram='524288' vgamem='262144' heads='1' primary='yes'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
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</video>
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<!-- filesystems -->
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<filesystem type='mount' accessmode='passthrough'>
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<source dir='/nix/store'/>
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<target dir='store'/>
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<readonly/>
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</filesystem>
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<filesystem type='mount' accessmode='mapped'>
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<source dir='%s'/>
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<target dir='xchg'/> <!-- workaround for nixpkgs/nixos/modules/virtualisation/qemu-vm.nix -->
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</filesystem>
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<filesystem type='mount' accessmode='mapped'>
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<source dir='%s'/>
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<target dir='shared'/> <!-- workaround for nixpkgs/nixos/modules/virtualisation/qemu-vm.nix -->
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</filesystem>
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<filesystem type='mount' accessmode='mapped'>
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<source dir='%s'/>
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<target dir='home'/>
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</filesystem>
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</devices>
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<qemu:commandline>
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<qemu:arg value='-device'/>
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<qemu:arg value='e1000,netdev=net0'/>
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<qemu:arg value='-netdev'/>
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<qemu:arg value='user,id=net0'/>
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<qemu:arg value='-snapshot'/>
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</qemu:commandline>
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</domain>
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`
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func generateXML(name, vmNixPath, reginfo, img, sharedDir string) string {
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// TODO: Define XML in go
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return fmt.Sprintf(xmlTmpl, "appvm_"+name, vmNixPath, vmNixPath, vmNixPath,
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reginfo, img, sharedDir, sharedDir, sharedDir)
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}
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func list(l *libvirt.Libvirt) {
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domains, err := l.Domains()
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println("Started VM:")
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for _, d := range domains {
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if strings.HasPrefix(d.Name, "appvm") {
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fmt.Println("\t", d.Name[6:])
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}
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}
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fmt.Println("\nAvailable VM:")
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files, err := ioutil.ReadDir(os.Getenv("GOPATH") + "/src/code.dumpstack.io/tools/appvm/nix")
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if err != nil {
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log.Fatal(err)
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}
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for _, f := range files {
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if f.Name() != "base.nix" &&
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f.Name() != "local.nix" && f.Name() != "monitor.nix" &&
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f.Name() != "local.nix.template" && f.Name() != "monitor.nix.template" {
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fmt.Println("\t", f.Name()[0:len(f.Name())-4])
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}
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}
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}
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func copyFile(from, to string) (err error) {
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source, err := os.Open(from)
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if err != nil {
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return
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}
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defer source.Close()
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destination, err := os.Create(to)
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if err != nil {
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return
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}
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_, err = io.Copy(destination, source)
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if err != nil {
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destination.Close()
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return
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}
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return destination.Close()
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}
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func prepareTemplates(appvmPath string) (err error) {
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if _, err = os.Stat(appvmPath + "/nix/local.nix"); os.IsNotExist(err) {
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err = copyFile(appvmPath+"/nix/local.nix.template", appvmPath+"/nix/local.nix")
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if err != nil {
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return
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}
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}
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if _, err = os.Stat(appvmPath + "/nix/monitor.nix"); os.IsNotExist(err) {
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err = copyFile(appvmPath+"/nix/monitor.nix.template", appvmPath+"/nix/monitor.nix")
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if err != nil {
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return
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}
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}
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return
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}
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func streamStdOutErr(command *cmd.Cmd) {
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for {
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select {
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case line := <-command.Stdout:
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fmt.Println(line)
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case line := <-command.Stderr:
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fmt.Fprintln(os.Stderr, line)
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}
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}
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}
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func generateVM(name string, verbose bool) (realpath, reginfo, qcow2 string, err error) {
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command := cmd.NewCmdOptions(cmd.Options{Buffered: false, Streaming: true},
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"nix-build", "<nixpkgs/nixos>", "-A", "config.system.build.vm",
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"-I", "nixos-config=nix/"+name+".nix", "-I", ".")
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if verbose {
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go streamStdOutErr(command)
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}
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status := <-command.Start()
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if status.Error != nil || status.Exit != 0 {
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log.Println(status.Error, status.Stdout, status.Stderr)
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if status.Error != nil {
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err = status.Error
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} else {
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s := fmt.Sprintf("ret code: %d, out: %v, err: %v",
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status.Exit, status.Stdout, status.Stderr)
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err = errors.New(s)
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}
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return
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}
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realpath, err = filepath.EvalSymlinks("result/system")
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if err != nil {
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return
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}
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bytes, err := ioutil.ReadFile("result/bin/run-nixos-vm")
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if err != nil {
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return
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}
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match := regexp.MustCompile("regInfo=.*/registration").FindSubmatch(bytes)
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if len(match) != 1 {
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err = errors.New("should be one reginfo")
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return
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}
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reginfo = string(match[0])
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syscall.Unlink("result")
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qcow2 = os.Getenv("HOME") + "/appvm/.fake.qcow2"
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if _, err = os.Stat(qcow2); os.IsNotExist(err) {
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system.System("qemu-img", "create", "-f", "qcow2", qcow2, "512M")
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err = os.Chmod(qcow2, 0400) // qemu run with -snapshot, we only need it for create /dev/vda
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if err != nil {
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return
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}
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}
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return
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}
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func isRunning(l *libvirt.Libvirt, name string) bool {
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_, err := l.DomainLookupByName("appvm_" + name) // yep, there is no libvirt error handling
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// VM is destroyed when stop so NO VM means STOPPED
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return err == nil
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}
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func generateAppVM(l *libvirt.Libvirt, appvmPath, name string, verbose bool) (err error) {
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err = os.Chdir(appvmPath)
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if err != nil {
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return
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}
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realpath, reginfo, qcow2, err := generateVM(name, verbose)
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if err != nil {
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return
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}
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sharedDir := fmt.Sprintf(os.Getenv("HOME") + "/appvm/" + name)
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os.MkdirAll(sharedDir, 0700)
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xml := generateXML(name, realpath, reginfo, qcow2, sharedDir)
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_, err = l.DomainCreateXML(xml, libvirt.DomainStartValidate)
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return
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}
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func stupidProgressBar() {
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const length = 70
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for {
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time.Sleep(time.Second / 4)
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fmt.Printf("\r%s]\r[", strings.Repeat(" ", length))
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for i := 0; i <= length-2; i++ {
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time.Sleep(time.Second / 20)
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fmt.Printf("+")
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}
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}
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}
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func start(l *libvirt.Libvirt, name string, verbose bool) {
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// Currently binary-only installation is not supported, because we need *.nix configurations
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appvmPath := os.Getenv("GOPATH") + "/src/code.dumpstack.io/tools/appvm"
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// Copy templates
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err := prepareTemplates(appvmPath)
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if err != nil {
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log.Fatal(err)
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}
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if !isRunning(l, name) {
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if !verbose {
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go stupidProgressBar()
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}
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err = generateAppVM(l, appvmPath, name, verbose)
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if err != nil {
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log.Fatal(err)
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}
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}
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cmd := exec.Command("virt-viewer", "appvm_"+name)
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cmd.Start()
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}
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func stop(l *libvirt.Libvirt, name string) {
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dom, err := l.DomainLookupByName("appvm_" + name)
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if err != nil {
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if libvirt.IsNotFound(err) {
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log.Println("Appvm not found or already stopped")
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return
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} else {
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log.Fatal(err)
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}
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}
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err = l.DomainShutdown(dom)
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if err != nil {
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log.Fatal(err)
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}
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}
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func drop(name string) {
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appDataPath := fmt.Sprintf(os.Getenv("HOME") + "/appvm/" + name)
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os.RemoveAll(appDataPath)
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}
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func autoBalloon(l *libvirt.Libvirt, memoryMin, adjustPercent uint64) {
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domains, err := l.Domains()
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if err != nil {
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log.Fatal(err)
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}
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table := tablewriter.NewWriter(os.Stdout)
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table.SetHeader([]string{"Application VM", "Used memory", "Current memory", "Max memory", "New memory"})
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for _, d := range domains {
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if d.Name[0:5] == "appvm" {
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name := d.Name[6:]
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memoryUsedRaw, err := ioutil.ReadFile(os.Getenv("HOME") + "/appvm/" + name + "/.memory_used")
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if err != nil {
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log.Fatal(err)
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}
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memoryUsedMiB, err := strconv.Atoi(string(memoryUsedRaw[0 : len(memoryUsedRaw)-1]))
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if err != nil {
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log.Fatal(err)
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}
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memoryUsed := memoryUsedMiB * 1024
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_, memoryMax, memoryCurrent, _, _, err := l.DomainGetInfo(d)
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if err != nil {
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log.Fatal(err)
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}
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memoryNew := uint64(float64(memoryUsed) * (1 + float64(adjustPercent)/100))
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if memoryNew > memoryMax {
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memoryNew = memoryMax - 1
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}
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if memoryNew < memoryMin {
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memoryNew = memoryMin
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}
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err = l.DomainSetMemory(d, memoryNew)
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if err != nil {
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log.Fatal(err)
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}
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table.Append([]string{name,
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fmt.Sprintf("%d", memoryUsed),
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fmt.Sprintf("%d", memoryCurrent),
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fmt.Sprintf("%d", memoryMax),
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fmt.Sprintf("%d", memoryNew)})
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}
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}
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table.Render()
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}
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func main() {
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os.Mkdir(os.Getenv("HOME")+"/appvm", 0700)
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c, err := net.DialTimeout("unix", "/var/run/libvirt/libvirt-sock", time.Second)
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if err != nil {
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log.Fatal(err)
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}
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l := libvirt.New(c)
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if err := l.Connect(); err != nil {
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log.Fatal(err)
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}
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defer l.Disconnect()
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kingpin.Command("list", "List applications")
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autoballonCommand := kingpin.Command("autoballoon", "Automatically adjust/reduce app vm memory")
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minMemory := autoballonCommand.Flag("min-memory", "Set minimal memory (megabytes)").Default("1024").Uint64()
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adjustPercent := autoballonCommand.Flag("adj-memory", "Adjust memory amount (percents)").Default("20").Uint64()
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startCommand := kingpin.Command("start", "Start application")
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startName := startCommand.Arg("name", "Application name").Required().String()
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startVerbose := startCommand.Flag("verbose", "Increase verbosity").Default("False").Bool()
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stopName := kingpin.Command("stop", "Stop application").Arg("name", "Application name").Required().String()
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dropName := kingpin.Command("drop", "Remove application data").Arg("name", "Application name").Required().String()
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switch kingpin.Parse() {
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case "list":
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list(l)
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case "start":
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start(l, *startName, *startVerbose)
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case "stop":
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stop(l, *stopName)
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case "drop":
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drop(*dropName)
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case "autoballoon":
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autoBalloon(l, *minMemory*1024, *adjustPercent)
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}
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}
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