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template.go
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template.go
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package cmd
import (
"fmt"
"log"
"regexp"
"sort"
"strconv"
"strings"
"time"
"github.com/exoscale/egoscale"
"github.com/spf13/cobra"
)
const (
templateFilterHelp = "template filter to use (featured|community|mine)"
)
// templateCmd represents the template command
var templateCmd = &cobra.Command{
Use: "template",
Short: "Templates details",
}
// validateTemplateFilter takes a template filter. Verifies if the
// filter value is valid, and handle filter aliases.
// Returns the template filter to use.
func validateTemplateFilter(templateFilter string) (string, error) {
if templateFilter == "mine" {
return "self", nil // nolint
}
if templateFilter != "self" && templateFilter != "community" && templateFilter != "featured" {
return "", fmt.Errorf("invalid template filter %s", templateFilter)
}
return templateFilter, nil
}
func getTemplateByNameOrID(zoneID *egoscale.UUID, v string, templateFilter string) (*egoscale.Template, error) {
req := &egoscale.ListTemplates{
TemplateFilter: templateFilter,
ZoneID: zoneID,
}
id, errUUID := egoscale.ParseUUID(v)
if errUUID != nil {
req.Name = v
} else {
req.ID = id
}
resp, err := cs.ListWithContext(gContext, req)
if err != nil {
return nil, err
}
if len(resp) == 0 {
return nil, fmt.Errorf("template %q not found", v)
}
if len(resp) == 1 {
return resp[0].(*egoscale.Template), nil
}
// Multiple results returned: we pick the most recent item from the list.
var (
template *egoscale.Template
templateDate time.Time
)
for _, t := range resp {
ts, err := time.Parse("2006-01-02T15:04:05-0700", t.(*egoscale.Template).Created)
if err != nil {
return nil, fmt.Errorf("template creation date parsing error: %s", err)
}
if ts.After(templateDate) {
templateDate = ts
template = t.(*egoscale.Template)
}
}
return template, nil
}
func findTemplates(zoneID *egoscale.UUID, templateFilter string, filters ...string) ([]egoscale.Template, error) {
allOS := make(map[string]*egoscale.Template)
reLinux := regexp.MustCompile(`^Linux (?P<name>.+?) (?P<version>[0-9]+(\.[0-9]+)?)`)
reVersion := regexp.MustCompile(`(?P<version>[0-9]+(\.[0-9]+)?)`)
req := &egoscale.ListTemplates{
TemplateFilter: templateFilter,
ZoneID: zoneID,
Keyword: strings.Join(filters, " "),
}
var err error
cs.PaginateWithContext(gContext, req, func(i interface{}, e error) bool {
if e != nil {
err = e
return false
}
template := i.(*egoscale.Template)
size := template.Size >> 30 // Size in GiB
if strings.HasPrefix(template.Name, "Linux") {
m := reSubMatchMap(reLinux, template.DisplayText)
if len(m) > 0 {
if size > 10 {
// Skipping big, legacy images
return true
}
version, errParse := strconv.ParseFloat(m["version"], 64)
if errParse != nil {
log.Printf("Malformed Linux version. got %q in %q", m["version"], template.Name)
return true
}
res := fmt.Sprintf("%.5f", 10000-version)
// fix Container Linux sorting
name := strings.Replace(m["name"], "stable ", "", 1)
key := fmt.Sprintf("Linux %s %s", name, res)
allOS[key] = template
return true
}
}
if strings.HasPrefix(template.Name, "Windows Server") || strings.HasPrefix(template.Name, "OpenBSD") {
m := reSubMatchMap(reVersion, template.DisplayText)
if len(m) > 0 {
version, errParse := strconv.ParseFloat(m["version"], 64)
if errParse != nil {
log.Printf("Malformed Windows/OpenBSD version. %q", template.Name)
return true
}
key := fmt.Sprintf("%s %.5f %5d", template.Name[:7], 10000-version, size)
allOS[key] = template
return true
}
}
// In doubt, use it directly
allOS[template.ID.String()] = template
return true
})
if err != nil {
return nil, err
}
keys := make([]string, 0, len(allOS))
for k := range allOS {
keys = append(keys, k)
}
sort.Strings(keys)
reDate := regexp.MustCompile(`.* \((?P<date>.*)\)$`)
templates := make([]egoscale.Template, len(keys))
for i, k := range keys {
t := allOS[k]
m := reSubMatchMap(reDate, t.DisplayText)
if m["date"] != "" {
t.Created = m["date"]
}
templates[i] = *t
}
return templates, nil
}
func reSubMatchMap(r *regexp.Regexp, str string) map[string]string {
match := r.FindStringSubmatch(str)
subMatchMap := make(map[string]string)
for i, name := range r.SubexpNames() {
if i != 0 && len(match) > 0 {
subMatchMap[name] = match[i]
}
}
return subMatchMap
}
func init() {
vmCmd.AddCommand(templateCmd)
}