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package libvirt
import (
"fmt"
"io"
"log"
"net/http"
"net/url"
"os"
"strconv"
"strings"
"time"
libvirt "github.com/libvirt/libvirt-go"
"github.com/libvirt/libvirt-go-xml"
)
// network transparent image
type image interface {
Size() (uint64, error)
Import(func(io.Reader) error, libvirtxml.StorageVolume) error
String() string
}
type localImage struct {
path string
}
func (i *localImage) String() string {
return i.path
}
func (i *localImage) Size() (uint64, error) {
file, err := os.Open(i.path)
if err != nil {
return 0, err
}
fi, err := file.Stat()
if err != nil {
return 0, err
}
return uint64(fi.Size()), nil
}
func (i *localImage) Import(copier func(io.Reader) error, vol libvirtxml.StorageVolume) error {
file, err := os.Open(i.path)
defer file.Close()
if err != nil {
return fmt.Errorf("Error while opening %s: %s", i.path, err)
}
fi, err := file.Stat()
if err != nil {
return err
}
// we can skip the upload if the modification times are the same
if vol.Target.Timestamps != nil && vol.Target.Timestamps.Mtime != "" {
if fi.ModTime() == timeFromEpoch(vol.Target.Timestamps.Mtime) {
log.Printf("Modification time is the same: skipping image copy")
return nil
}
}
return copier(file)
}
type httpImage struct {
url *url.URL
}
func (i *httpImage) String() string {
return i.url.String()
}
func (i *httpImage) Size() (uint64, error) {
response, err := http.Head(i.url.String())
if err != nil {
return 0, err
}
if response.StatusCode != 200 {
return 0,
fmt.Errorf(
"Error accessing remote resource: %s - %s",
i.url.String(),
response.Status)
}
length, err := strconv.Atoi(response.Header.Get("Content-Length"))
if err != nil {
err = fmt.Errorf(
"Error while getting Content-Length of \"%s\": %s - got %s",
i.url.String(),
err,
response.Header.Get("Content-Length"))
return 0, err
}
return uint64(length), nil
}
func (i *httpImage) Import(copier func(io.Reader) error, vol libvirtxml.StorageVolume) error {
client := &http.Client{}
req, _ := http.NewRequest("GET", i.url.String(), nil)
if vol.Target.Timestamps != nil && vol.Target.Timestamps.Mtime != "" {
req.Header.Set("If-Modified-Since", timeFromEpoch(vol.Target.Timestamps.Mtime).UTC().Format(http.TimeFormat))
}
response, err := client.Do(req)
defer response.Body.Close()
if err != nil {
return fmt.Errorf("Error while downloading %s: %s", i.url.String(), err)
}
if response.StatusCode == http.StatusNotModified {
return nil
}
return copier(response.Body)
}
func newImage(source string) (image, error) {
url, err := url.Parse(source)
if err != nil {
return nil, fmt.Errorf("Can't parse source '%s' as url: %s", source, err)
}
if strings.HasPrefix(url.Scheme, "http") {
return &httpImage{url: url}, nil
} else if url.Scheme == "file" || url.Scheme == "" {
return &localImage{path: url.Path}, nil
} else {
return nil, fmt.Errorf("Don't know how to read from '%s': %s", url.String(), err)
}
}
func newCopier(virConn *libvirt.Connect, volume *libvirt.StorageVol, size uint64) func(src io.Reader) error {
copier := func(src io.Reader) error {
var bytesCopied int64
stream, err := virConn.NewStream(0)
if err != nil {
return err
}
defer func() {
if uint64(bytesCopied) != size {
stream.Abort()
} else {
stream.Finish()
}
stream.Free()
}()
volume.Upload(stream, 0, size, 0)
sio := NewStreamIO(*stream)
bytesCopied, err = io.Copy(sio, src)
if err != nil {
return err
}
log.Printf("%d bytes uploaded\n", bytesCopied)
return nil
}
return copier
}
func timeFromEpoch(str string) time.Time {
var s, ns int
ts := strings.Split(str, ".")
if len(ts) == 2 {
ns, _ = strconv.Atoi(ts[1])
}
s, _ = strconv.Atoi(ts[0])
return time.Unix(int64(s), int64(ns))
}
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