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gitea/modules/avatar/avatar.go

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package avatar
import (
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"log"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"sync"
"time"
)
var gravatar = "http://www.gravatar.com/avatar"
// hash email to md5 string
func HashEmail(email string) string {
h := md5.New()
h.Write([]byte(strings.ToLower(email)))
return hex.EncodeToString(h.Sum(nil))
}
type Avatar struct {
Hash string
cacheDir string // image save dir
reqParams string
imagePath string
}
func New(hash string, cacheDir string) *Avatar {
return &Avatar{
Hash: hash,
cacheDir: cacheDir,
reqParams: url.Values{
"d": {"retro"},
"size": {"200"},
"r": {"pg"}}.Encode(),
imagePath: filepath.Join(cacheDir, hash+".jpg"),
}
}
// get image from gravatar.com
func (this *Avatar) Update() {
thunder.Fetch(gravatar+"/"+this.Hash+"?"+this.reqParams,
this.Hash+".jpg")
}
func (this *Avatar) UpdateTimeout(timeout time.Duration) {
select {
case <-time.After(timeout):
log.Println("timeout")
case <-thunder.GoFetch(gravatar+"/"+this.Hash+"?"+this.reqParams,
this.Hash+".jpg"):
}
}
var thunder = &Thunder{QueueSize: 10}
type Thunder struct {
QueueSize int // download queue size
q chan *thunderTask
once sync.Once
}
func (t *Thunder) init() {
if t.QueueSize < 1 {
t.QueueSize = 1
}
t.q = make(chan *thunderTask, t.QueueSize)
for i := 0; i < t.QueueSize; i++ {
go func() {
for {
task := <-t.q
task.Fetch()
}
}()
}
}
func (t *Thunder) Fetch(url string, saveFile string) error {
t.once.Do(t.init)
task := &thunderTask{
Url: url,
SaveFile: saveFile,
}
task.Add(1)
t.q <- task
task.Wait()
return task.err
}
func (t *Thunder) GoFetch(url, saveFile string) chan error {
c := make(chan error)
go func() {
c <- t.Fetch(url, saveFile)
}()
return c
}
// thunder download
type thunderTask struct {
Url string
SaveFile string
sync.WaitGroup
err error
}
func (this *thunderTask) Fetch() {
this.err = this.fetch()
this.Done()
}
func (this *thunderTask) fetch() error {
resp, err := http.Get(this.Url)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return fmt.Errorf("status code: %d", resp.StatusCode)
}
fd, err := os.Create(this.SaveFile)
if err != nil {
return err
}
defer fd.Close()
_, err = io.Copy(fd, resp.Body)
if err != nil {
return err
}
return nil
}