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fix download part problem, add png support

release/v1.15
skyblue 2014-03-23 15:55:27 +08:00
parent 8e47ae2102
commit 79604f553f
1 changed files with 162 additions and 17 deletions
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179
modules/avatar/avatar.go
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@ -3,7 +3,11 @@ package avatar
import (
"crypto/md5"
"encoding/hex"
"errors"
"fmt"
"image"
"image/jpeg"
"image/png"
"io"
"log"
"net/http"
@ -13,9 +17,14 @@ import (
"strings"
"sync"
"time"
"github.com/nfnt/resize"
)
var gravatar = "http://www.gravatar.com/avatar"
var (
gravatar = "http://www.gravatar.com/avatar"
defaultImagePath = "./default.jpg"
)
// hash email to md5 string
func HashEmail(email string) string {
@ -25,37 +34,145 @@ func HashEmail(email string) string {
}
type Avatar struct {
Hash string
cacheDir string // image save dir
reqParams string
imagePath string
Hash string
cacheDir string // image save dir
reqParams string
imagePath string
expireDuration time.Duration
}
func New(hash string, cacheDir string) *Avatar {
return &Avatar{
Hash: hash,
cacheDir: cacheDir,
Hash: hash,
cacheDir: cacheDir,
expireDuration: time.Minute * 10,
reqParams: url.Values{
"d": {"retro"},
"size": {"200"},
"r": {"pg"}}.Encode(),
imagePath: filepath.Join(cacheDir, hash+".jpg"),
imagePath: filepath.Join(cacheDir, hash+".image"), //maybe png or jpeg
}
}
func (this *Avatar) InCache() bool {
fileInfo, err := os.Stat(this.imagePath)
return err == nil && fileInfo.Mode().IsRegular()
}
func (this *Avatar) Modtime() (modtime time.Time, err error) {
fileInfo, err := os.Stat(this.imagePath)
if err != nil {
return
}
return fileInfo.ModTime(), nil
}
func (this *Avatar) Expired() bool {
if !this.InCache() {
return true
}
fileInfo, err := os.Stat(this.imagePath)
return err != nil || time.Since(fileInfo.ModTime()) > this.expireDuration
}
// default image format: jpeg
func (this *Avatar) Encode(wr io.Writer, size int) (err error) {
var img image.Image
decodeImageFile := func(file string) (img image.Image, err error) {
fd, err := os.Open(file)
if err != nil {
return
}
defer fd.Close()
img, err = jpeg.Decode(fd)
if err != nil {
fd.Seek(0, os.SEEK_SET)
img, err = png.Decode(fd)
}
return
}
imgPath := this.imagePath
if !this.InCache() {
imgPath = defaultImagePath
}
img, err = decodeImageFile(imgPath)
if err != nil {
return
}
m := resize.Resize(uint(size), 0, img, resize.Lanczos3)
return jpeg.Encode(wr, m, nil)
}
// get image from gravatar.com
func (this *Avatar) Update() {
thunder.Fetch(gravatar+"/"+this.Hash+"?"+this.reqParams,
this.Hash+".jpg")
this.imagePath)
}
func (this *Avatar) UpdateTimeout(timeout time.Duration) {
func (this *Avatar) UpdateTimeout(timeout time.Duration) error {
var err error
select {
case <-time.After(timeout):
log.Println("timeout")
case <-thunder.GoFetch(gravatar+"/"+this.Hash+"?"+this.reqParams,
this.Hash+".jpg"):
err = errors.New("get gravatar image timeout")
case err = <-thunder.GoFetch(gravatar+"/"+this.Hash+"?"+this.reqParams,
this.imagePath):
}
return err
}
func init() {
log.SetFlags(log.Lshortfile | log.LstdFlags)
}
// http.Handle("/avatar/", avatar.HttpHandler("./cache"))
func HttpHandler(cacheDir string) func(w http.ResponseWriter, r *http.Request) {
MustInt := func(r *http.Request, defaultValue int, keys ...string) int {
var v int
for _, k := range keys {
if _, err := fmt.Sscanf(r.FormValue(k), "%d", &v); err == nil {
defaultValue = v
}
}
return defaultValue
}
return func(w http.ResponseWriter, r *http.Request) {
urlPath := r.URL.Path
hash := urlPath[strings.LastIndex(urlPath, "/")+1:]
hash = HashEmail(hash)
size := MustInt(r, 80, "s", "size") // size = 80*80
avatar := New(hash, cacheDir)
if avatar.Expired() {
err := avatar.UpdateTimeout(time.Millisecond * 500)
if err != nil {
log.Println(err)
}
}
if modtime, err := avatar.Modtime(); err == nil {
etag := fmt.Sprintf("size(%d)", size)
if t, err := time.Parse(http.TimeFormat, r.Header.Get("If-Modified-Since")); err == nil && modtime.Before(t.Add(1*time.Second)) && etag == r.Header.Get("If-None-Match") {
h := w.Header()
delete(h, "Content-Type")
delete(h, "Content-Length")
w.WriteHeader(http.StatusNotModified)
return
}
w.Header().Set("Last-Modified", modtime.UTC().Format(http.TimeFormat))
w.Header().Set("ETag", etag)
}
w.Header().Set("Content-Type", "image/jpeg")
err := avatar.Encode(w, size)
if err != nil {
log.Println(err)
w.WriteHeader(500)
}
}
}
func init() {
http.HandleFunc("/", HttpHandler("./"))
log.Fatal(http.ListenAndServe(":8001", nil))
}
var thunder = &Thunder{QueueSize: 10}
@ -114,8 +231,17 @@ func (this *thunderTask) Fetch() {
this.Done()
}
var client = &http.Client{}
func (this *thunderTask) fetch() error {
resp, err := http.Get(this.Url)
log.Println("thunder, fetch", this.Url)
req, _ := http.NewRequest("GET", this.Url, nil)
req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8")
req.Header.Set("Accept-Encoding", "gzip,deflate,sdch")
req.Header.Set("Accept-Language", "zh-CN,zh;q=0.8")
req.Header.Set("Cache-Control", "no-cache")
req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36")
resp, err := client.Do(req)
if err != nil {
return err
}
@ -123,14 +249,33 @@ func (this *thunderTask) fetch() error {
if resp.StatusCode != 200 {
return fmt.Errorf("status code: %d", resp.StatusCode)
}
fd, err := os.Create(this.SaveFile)
/*
log.Println("headers:", resp.Header)
switch resp.Header.Get("Content-Type") {
case "image/jpeg":
this.SaveFile += ".jpeg"
case "image/png":
this.SaveFile += ".png"
}
*/
/*
imgType := resp.Header.Get("Content-Type")
if imgType != "image/jpeg" && imgType != "image/png" {
return errors.New("not png or jpeg")
}
*/
tmpFile := this.SaveFile + ".part" // mv to destination when finished
fd, err := os.Create(tmpFile)
if err != nil {
return err
}
defer fd.Close()
_, err = io.Copy(fd, resp.Body)
fd.Close()
if err != nil {
os.Remove(tmpFile)
return err
}
return nil
return os.Rename(tmpFile, this.SaveFile)
}