func TestContext(t *testing.T) {
c, err := NewContext(nil)
if err != nil {
t.Fatalf("NewContext: %v", err)
}
defer c.Close()
_, err = memcache.Get(c, "foo")
if err != memcache.ErrCacheMiss {
t.Fatalf("Get err = %v; want ErrCacheMiss", err)
}
it := &memcache.Item{
Key: "foo",
Value: []byte("value"),
}
err = memcache.Set(c, it)
if err != nil {
t.Fatalf("Set err = %v", err)
}
it, err = memcache.Get(c, "foo")
if err != nil {
t.Fatalf("Get err = %v; want no error", err)
}
if string(it.Value) != "value" {
t.Errorf("got Item.Value = %q; want %q", string(it.Value), "value")
}
e := &Entity{Foo: "foo", Bar: "bar"}
k := datastore.NewKey(c, "Entity", "", 1, nil)
_, err = datastore.Put(c, k, e)
if err != nil {
t.Fatalf("datastore.Put: %v", err)
}
}
func TestContext(t *testing.T) {
c, err := NewContext(nil)
if err != nil {
t.Fatalf("NewContext: %v", err)
}
defer c.Close()
_, err = memcache.Get(c, "foo")
if err != memcache.ErrCacheMiss {
t.Fatalf("Get err = %v; want ErrCacheMiss", err)
}
it := &memcache.Item{
Key: "foo",
Value: []byte("value"),
}
err = memcache.Set(c, it)
if err != nil {
t.Fatalf("Set err = %v", err)
}
it, err = memcache.Get(c, "foo")
if err != nil {
t.Fatalf("Get err = %v; want no error", err)
}
if string(it.Value) != "value" {
t.Errorf("got Item.Value = %q; want %q", string(it.Value), "value")
}
e := &Entity{Foo: "foo", Bar: "bar"}
k := datastore.NewKey(c, "Entity", "", 1, nil)
_, err = datastore.Put(c, k, e)
if err != nil {
t.Fatalf("datastore.Put: %v", err)
}
u := user.Current(c)
if u != nil {
t.Fatalf("User should not be not logged in!")
}
c.Login("*****@*****.**", false)
u = user.Current(c)
if u == nil {
t.Fatalf("User should be logged in!")
}
id1 := u.ID
c.Logout()
u = user.Current(c)
if u != nil {
t.Fatalf("User should not be not logged in!")
}
c.Login("*****@*****.**", false)
u = user.Current(c)
if u == nil {
t.Fatalf("User should be logged in!")
}
if id1 == u.ID {
t.Fatalf("User IDs should be unique")
}
}
func Redirect(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
var dest Shortcut
key := r.URL.Path
if item, err := memcache.Get(c, key); err == nil {
http.Redirect(w, r, string(item.Value), http.StatusSeeOther)
return
} else if err != memcache.ErrCacheMiss {
c.Errorf("error getting item: %v", err)
}
dkey := datastore.NewKey(c, ShortcutType, key, 0, nil)
if err := datastore.Get(c, dkey, &dest); err == datastore.ErrNoSuchEntity {
c.Debugf("not found %q: %s", key, err)
http.Error(w, "nothing to redirect", http.StatusNotFound)
return
} else if err != nil {
c.Errorf("error: %s", err)
http.Error(w, "ups...", http.StatusInternalServerError)
return
}
item := memcache.Item{
Key: dest.ShortUrl,
Value: []byte(dest.FullUrl),
}
if err := memcache.Set(c, &item); err != nil {
c.Errorf("error setting item: %v", err)
}
http.Redirect(w, r, dest.FullUrl, http.StatusSeeOther)
}
func searchsite(c *appengine.Context, referer string) int64 {
hash := "ref:" + referer
item, err := memcache.Get(*c, hash)
if err != nil {
q := datastore.NewQuery("MySite").Filter("url", referer)
log.Print(q)
/* t := q.Run(*c)
/* var x MySite
key, err := t.Next(&x)
if err == datastore.Done {
//Not found
mysite := MySite {
url: referer,
created: datastore.SecondsToTime(time.Seconds()),
views : 1,
last_access: datastore.SecondsToTime(time.Seconds()),
}
key, _ := datastore.Put(*c, datastore.NewIncompleteKey("MySite"), &mysite)
return key.IntID()
}
return key.IntID()
*/
return 0
}
r, _ := strconv.Atoi64(string(item.Value))
return r
}
func query(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
cacheKey := getCacheKey(c)
if item, err := memcache.Get(c, cacheKey); err != memcache.ErrCacheMiss {
fmt.Fprintf(w, "%s", item.Value)
return
}
q := datastore.NewQuery("Entity")
result := map[string]string{}
for t := q.Run(c); ; {
var entity Entity
key, err := t.Next(&entity)
if err == datastore.Done {
break
}
if err != nil {
result["error"] = fmt.Sprintf("%s", err)
}
keyString := fmt.Sprintf("%s", key)
result[keyString] = entity.Value
}
jsonResult := mapToJson(result)
item := &memcache.Item{
Key: cacheKey,
Value: jsonResult,
}
memcache.Set(c, item)
fmt.Fprintf(w, "%s", jsonResult)
}
func cachePathTime(c appengine.Context, path string) (t int64, err error) {
t, err = cacheTime(c)
if err != nil {
return 0, err
}
key := fmt.Sprintf("%d,mtime,%s", t, path)
item, err := memcache.Get(c, key)
if err == nil {
v, err := strconv.ParseInt(string(item.Value), 10, 64)
if err == nil {
if chatty {
c.Infof("cachePathTime %q = %v", key, v)
}
return v, nil
}
c.Criticalf("memcache.Get %q = %q (%v) - deleting", key, item.Value, err)
memcache.Delete(c, key)
}
var seq int64
if fi, err := stat(c, path); err == nil {
seq = fi.Seq
}
c.Infof("cachePathTime save %q = %v", key, seq)
item = &memcache.Item{Key: key, Value: []byte(strconv.FormatInt(seq, 10))}
if err := memcache.Set(c, item); err != nil {
c.Criticalf("memcache.Set %q %q: %v", key, item.Value, err)
}
return seq, nil
}
func RetrieveActDetails(c appengine.Context, actId int) (res *ActDetail, err os.Error) {
var d DSActDetail
if itm, err := memcache.Get(c, "actId__"+strconv.Itoa(actId)); err != nil && err != memcache.ErrCacheMiss {
return nil, err
} else if err == nil {
// Cache hit
buf := bytes.NewBuffer(itm.Value)
dec := gob.NewDecoder(buf)
dec.Decode(&d)
} else {
// Cache miss
key := datastore.NewKey(c, "DSActDetail", "", int64(actId), nil)
if err := datastore.Get(c, key, &d); err == datastore.ErrNoSuchEntity {
return &ActDetail{ActId: actId}, nil
} else if err != nil {
return nil, err
}
buf := bytes.NewBufferString("")
enc := gob.NewEncoder(buf)
enc.Encode(d)
itm := &memcache.Item{
Key: "actId__" + strconv.Itoa(actId),
Value: buf.Bytes(),
}
err = memcache.Set(c, itm)
c.Debugf("Request cache to memcache")
}
return d.fromDS(), nil
}
func C1Logout(c appengine.Context) os.Error {
u := user.Current(c).Email
itm, err := memcache.Get(c, u+"__c1Sess")
if err != nil && err != memcache.ErrCacheMiss {
return err
}
if err == memcache.ErrCacheMiss {
return nil
}
skey := string(itm.Value)
session := c1SessionCookie(skey)
r, err := http.NewRequest("GET", "https://www.cadetone.aafc.org.au/logout.php", nil)
if err != nil {
return err
}
injectSession(r, session)
client := GetClient(c)
_, err = client.Do(r)
if err != nil {
return err
}
memcache.Delete(c, u+"__c1Sess")
return nil
}
// Cached read rss
func rssCachedGet(c appengine.Context, url string) ([]byte, error) {
item, err := memcache.Get(c, url)
if err != nil && err != memcache.ErrCacheMiss {
return nil, err
}
// Cache hit
if err == nil {
return item.Value, err
}
// Cache miss
channel, err := rssGet(c, url)
if err != nil {
return nil, err
}
buf := bytes.NewBuffer(nil)
json.NewEncoder(buf).Encode(channel)
expriation, err := time.ParseDuration("5m")
if err != nil {
return nil, err
}
item = &memcache.Item{
Key: url,
Value: buf.Bytes(),
Expiration: expriation,
}
return item.Value, memcache.Set(c, item)
}
func cat(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
w.Header().Set("Content-Type", "application/json")
switch r.Method {
case "GET":
var jsonResult []byte
if item, err := memcache.Get(c, CAT); err == memcache.ErrCacheMiss {
q := datastore.NewQuery("Package").Filter("Accepted =", true)
var packages []*Package
if _, err := q.GetAll(c, &packages); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
var categories Categories
for _, pkg := range packages {
if strings.TrimSpace(pkg.Category) != "" {
categories = categories.Add(pkg.Category)
}
}
if jsonResult, err = json.Marshal(categories); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
memcache.Add(c, &memcache.Item{Key: CAT, Value: jsonResult})
} else {
jsonResult = item.Value
}
w.Write(jsonResult)
}
}
// Lista entidades
func ListEnt(c appengine.Context, ent string) *[]Entidad {
estados := make([]Entidad, 0, 32)
if item, err := memcache.Get(c, "estados"); err == memcache.ErrCacheMiss {
q := datastore.NewQuery("Entidad")
if _, err := q.GetAll(c, &estados); err != nil {
return nil
}
b, _ := json.Marshal(estados)
item := &memcache.Item{
Key: "estados",
Value: b,
}
if err := memcache.Add(c, item); err == memcache.ErrNotStored {
c.Errorf("memcache.Add Entidad : %v", err)
}
} else {
//c.Infof("Memcache activo: %v", item.Key)
if err := json.Unmarshal(item.Value, &estados); err != nil {
c.Errorf("Memcache Unmarshalling item: %v", err)
}
}
for i, _ := range estados {
if ent == estados[i].CveEnt {
estados[i].Selected = `selected`
}
}
return &estados
}
func ListCat(c appengine.Context, IdCat int) *[]Categoria {
var categorias []Categoria
if item, err := memcache.Get(c, "categorias"); err == memcache.ErrCacheMiss {
q := datastore.NewQuery("Categoria")
//n, _ := q.Count(c)
//cats := make([]Categoria, 0, n)
if _, err := q.GetAll(c, &categorias); err != nil {
return nil
}
b, _ := json.Marshal(categorias)
item := &memcache.Item{
Key: "categorias",
Value: b,
}
if err := memcache.Add(c, item); err == memcache.ErrNotStored {
c.Errorf("memcache.Add Categoria : %v", err)
}
} else {
c.Infof("Memcache activo: %v", item.Key)
if err := json.Unmarshal(item.Value, &categorias); err != nil {
c.Errorf("Memcache Unmarchalling item: %v", err)
}
}
for i, _ := range categorias {
if IdCat == categorias[i].IdCat {
categorias[i].Selected = `selected`
}
}
return &categorias
}
func setServiceAccountForDev(c appengine.Context, s *Service) error {
transport := &oauth.Transport{
Config: config,
Transport: &urlfetch.Transport{
Context: c,
},
}
// cacheがあるか？
item, err := memcache.Get(c, tokenCacheKey)
if err == memcache.ErrCacheMiss {
return fmt.Errorf("Visit this URL to get a code: http://localhost:8081/_admin/gapi_auth")
} else if err != nil {
return err
}
// トークンの読み込み
token := &oauth.Token{}
err = json.Unmarshal(item.Value, token)
if err != nil {
return err
}
// トークンの更新
transport.Token = token
err = transport.Refresh()
if err != nil {
return err
}
client := transport.Client()
service, err := bigquery.New(client)
if err != nil {
return err
}
s.bq = service
return nil
}
func (c Creature) Serve(response http.ResponseWriter, request *http.Request, ctx appengine.Context, width int, height int) {
max := int(math.Max(float64(width), float64(height)))
key := c.Name + ":" + strconv.Itoa(width) + "x" + strconv.Itoa(height)
if width == 0 || height == 0 {
http.NotFound(response, request)
}
// In cache?
if cached, err := memcache.Get(ctx, key); err == nil {
response.Header().Set("Content-Type", "image/jpeg")
response.Write(cached.Value)
return
}
if image, err := c.CropImage(width, height, max, ctx); err == nil {
response.Header().Set("Content-Type", "image/jpeg")
// Get the raw data and cache it
writer := bytes.NewBuffer(make([]byte, 0))
jpeg.Encode(writer, image, nil)
item := memcache.Item{
Key: key,
Value: writer.Bytes(),
}
memcache.Set(ctx, &item)
response.Write(item.Value)
return
}
http.NotFound(response, request)
}
func getReminderDate(c appengine.Context, text string) (time.Time, error) {
re, err := regexp.Compile(`diaryentry\d+tag`)
if err != nil {
return time.Now(), fmt.Errorf("Failed to compile regex: %v", err)
}
tag := re.FindString(text)
if tag == "" {
return time.Now(), fmt.Errorf("Failed to match tag")
}
item, err := memcache.Get(c, tag)
if err == memcache.ErrCacheMiss {
return time.Now(), fmt.Errorf("item not in the cache")
} else if err != nil {
return time.Now(), fmt.Errorf("error getting item: %v", err)
}
date, err := time.Parse(time.RFC850, string(item.Value))
if err != nil {
return time.Now(), fmt.Errorf("failed to parse date: %v", err)
}
return date, nil
}
func loadHandler(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
id, ok := parseIdParam(w, r)
if !ok {
return
}
// try memcache
memId := jsonMemId(id)
if item, err := memcache.Get(c, memId); err == nil {
sendJson(c, w, item.Value)
return
}
c.Debugf("cache miss for %v", memId)
// try datastore
m, ok := loadMovie(w, r, id)
if !ok {
return
}
data, err := json.Marshal(&m)
if err != nil {
c.Errorf("can't marshal JSON for movie %v: %v", id, err)
http.Error(w, "can't encode movie", http.StatusBadRequest)
return
}
cacheJson(c, id, data)
sendJson(c, w, data)
}
func freshen(c appengine.Context, key string) error {
s, ok := Sources[key]
if !ok {
return fmt.Errorf("%q not found", key)
}
item, err := memcache.Get(c, key+"_fresh")
if err == memcache.ErrCacheMiss {
return fetch(c, key)
} else if err != nil {
return err
}
fresh, err := strconv.ParseInt(string(item.Value), 10, 64)
if err != nil {
return err
}
if time.Now().Unix() < fresh+int64(s.Refresh.Seconds()) {
return nil
}
t := &taskqueue.Task{Path: "/fetch/" + key}
if _, err := taskqueue.Add(c, t, "fetch-"+key); err != nil {
return err
}
return nil
}
func cachingGetUpstreamAtom(ctx appengine.Context) (*Feed, error) {
item, err := memcache.Get(ctx, atomKey)
if err != nil {
ctx.Infof("making request to xkcd.com")
feed, err := getUpstreamAtom(ctx)
if err != nil {
return nil, err
}
if b, err := xml.Marshal(feed); err == nil {
item = &memcache.Item{
Key: atomKey,
Value: b,
Expiration: 5 * time.Minute,
}
memcache.Set(ctx, item)
}
return feed, nil
}
ctx.Infof("found feed in cache")
var feed Feed
if err := xml.Unmarshal(item.Value, &feed); err != nil {
return nil, fmt.Errorf("failed to unmarshal cached feed: %v", err)
}
return &feed, nil
}
// HTTP handler for /feed
func feedHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Cache-control", config.Require("cache_control_header"))
c := appengine.NewContext(r)
key := r.URL.Path + "@" + appengine.VersionID(c)
if item, err := memcache.Get(c, key); err == memcache.ErrCacheMiss {
c.Infof("Page %s not in the cache", key)
} else if err != nil {
c.Errorf("error getting page: %v", err)
} else {
c.Infof("Page %s found in the cache", key)
w.Write(item.Value)
return
}
entry_count, _ := config.GetInt("entries_per_page")
entries, _ := GetEntries(c, EntryQuery{IsPage: false, Count: int(entry_count)})
links := make([]SavedLink, 0)
context, _ := GetTemplateContext(entries, links, "Atom Feed", "feed", r)
var contentBuffer bytes.Buffer
feedTpl.ExecuteTemplate(&contentBuffer, "feed.html", context)
content, _ := ioutil.ReadAll(&contentBuffer)
w.Write(content)
// Feeds get cached infinitely, until an edit flushes it.
storeInCache(c, key, content, 0)
}
func getCached(c appengine.Context, key string, missing func(appengine.Context, string) (*bytes.Buffer, error)) (*memcache.Item, error) {
item, err := memcache.Get(c, key)
if err == memcache.ErrCacheMiss {
c.Infof("item not in the cache: %v", key)
result, err := missing(c, key)
if err != nil {
return nil, err
}
item = &memcache.Item{
Key: key,
Value: result.Bytes(),
}
if err := memcache.Add(c, item); err == memcache.ErrNotStored {
c.Warningf("item with key %q already exists", item.Key)
} else if err != nil {
return item, err
}
} else if err != nil {
return item, err
} else {
c.Infof("Cache hit: %v", key)
}
return item, nil
}
func updateCacheTime(c appengine.Context, seq int64) {
const key = rootMemcacheKey
bseq := []byte(strconv.FormatInt(seq, 10))
for tries := 0; tries < 10; tries++ {
item, err := memcache.Get(c, key)
if err != nil {
c.Infof("memcache.Get %q: %v", key, err)
err = memcache.Add(c, &memcache.Item{Key: key, Value: bseq})
if err == nil {
c.Infof("memcache.Add %q %q ok", key, bseq)
return
}
c.Infof("memcache.Add %q %q: %v", key, bseq, err)
}
v, err := strconv.ParseInt(string(item.Value), 10, 64)
if err != nil {
c.Criticalf("memcache.Get %q = %q (%v)", key, item.Value, err)
return
}
if v >= seq {
return
}
item.Value = bseq
err = memcache.CompareAndSwap(c, item)
if err == nil {
c.Infof("memcache.CAS %q %d->%d ok", key, v, seq)
return
}
c.Infof("memcache.CAS %q %d->%d: %v", key, v, seq, err)
}
c.Criticalf("repeatedly failed to update root key")
}
func GetPage(r *http.Request, name string) (*Page, error) {
var page *Page
c := appengine.NewContext(r)
if item, err := memcache.Get(c, "page"+name); err == memcache.ErrCacheMiss {
// Fetch the page
q := datastore.NewQuery("Page").Filter("Name =", name)
var pages []*Page
keys, err := q.GetAll(c, &pages)
if err != nil {
return nil, err
}
if keys == nil || pages == nil {
return nil, errors.New(name + " page doesn't exit")
}
page = pages[0]
} else {
if err := json.Unmarshal(item.Value, &page); err != nil {
return nil, err
}
}
return page, nil
}
func updateHandler(w http.ResponseWriter, r *http.Request) {
c := gae.NewContext(r)
g := goon.FromContext(c)
if r.Header.Get("X-AppEngine-Cron") != "true" {
http.NotFound(w, r)
return
}
var ups []UpdateSchedule
if cache, err := memcache.Get(c, "UpdateSchedule"); err == memcache.ErrCacheMiss {
q := datastore.NewQuery("UpdateSchedule")
if _, err := g.GetAll(q, &ups); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if val, err := serialize(&ups); err == nil {
item := memcache.Item{Key: "UpdateSchedule", Value: val, Expiration: time.Hour * 12}
memcache.Add(c, &item)
}
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
} else {
deserialize(cache.Value, &ups)
}
now := time.Now()
for _, us := range ups {
if us.IsUpdateTime(now) {
if err := updateVillage(us, g); err != nil {
c.Debugf("%v", err)
}
memcache.Delete(c, "UpdateSchedule")
}
}
return
}
func view(prefix string) http.Handler {
f := func(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
p := r.URL.Path[len(prefix):]
if p == "" {
p = "index"
}
s := new(Page)
k := datastore.NewKey(c, "string", p, 0, nil)
if item, err := memcache.Get(c, p); err == memcache.ErrCacheMiss {
datastore.Get(c, k, s)
err = memcache.Set(c, &memcache.Item{Key: p, Value: []byte(s.Content)})
if err != nil {
panic(err)
}
} else if err != nil {
panic(err)
} else {
s.Content = string(item.Value)
}
output := string(blackfriday.MarkdownCommon([]byte(s.Content)))
viewTemplate.Execute(w, Foo{p, output, ""})
}
return http.HandlerFunc(f)
}
func get(w http.ResponseWriter, r *http.Request) {
keyName := r.FormValue("key")
c := appengine.NewContext(r)
result := map[string]string{
keyName: "",
"error": "",
}
if item, err := memcache.Get(c, keyName); err == nil {
result[keyName] = fmt.Sprintf("%q", item.Value)
fmt.Fprintf(w, "%s", mapToJson(result))
return
}
key := datastore.NewKey("Entity", keyName, 0, nil)
entity := new(Entity)
if err := datastore.Get(c, key, entity); err == nil {
result[keyName] = entity.Value
// Set the value to speed up future reads - errors here aren't
// that bad, so don't worry about them
item := &memcache.Item{
Key: keyName,
Value: []byte(entity.Value),
}
memcache.Set(c, item)
} else {
result["error"] = fmt.Sprintf("%s", err)
}
fmt.Fprintf(w, "%s", mapToJson(result))
}
func municipios(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
_, ok := sess.IsSess(w, r, c)
if ok {
if item, err := memcache.Get(c, "msp_"+r.FormValue("CveEnt")); err == memcache.ErrCacheMiss {
if entidad, err := model.GetEntidad(c, r.FormValue("CveEnt")); err == nil {
if municipios, _ := entidad.GetMunicipios(c); err == nil {
b, _ := json.Marshal(municipios)
item := &memcache.Item{
Key: "msp_" + r.FormValue("CveEnt"),
Value: b,
}
if err := memcache.Add(c, item); err == memcache.ErrNotStored {
c.Infof("item with key %q already exists", item.Key)
} else if err != nil {
c.Errorf("Error memcache.Add Municipio : %v", err)
}
c.Infof("CveMun generado: %v", item.Key)
htmlComboMuns(w, municipios, r.FormValue("CveMun"))
}
}
} else {
//c.Infof("Memcache activo: %v", item.Key)
var municipios []model.Municipio
if err := json.Unmarshal(item.Value, &municipios); err != nil {
c.Errorf("error adding item: %v", err)
}
htmlComboMuns(w, &municipios, r.FormValue("CveMun"))
}
}
return
}
func handle(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
item, err := memcache.Get(c, r.URL.Path)
if err != nil && err != memcache.ErrCacheMiss {
serveError(c, w, err)
return
}
n := 0
if err == nil {
n, err = strconv.Atoi(string(item.Value))
if err != nil {
serveError(c, w, err)
return
}
}
n++
item = &memcache.Item{
Key: r.URL.Path,
Value: []byte(strconv.Itoa(n)),
}
err = memcache.Set(c, item)
if err != nil {
serveError(c, w, err)
return
}
w.Header().Set("Content-Type", "text/plain")
fmt.Fprintf(w, "%q has been visited %d times", r.URL.Path, n)
}
func loadRev(c appengine.Context, uuid string, ch chan revRes) {
rv := revRes{}
if item, err := memcache.Get(c, "rev."+uuid); err == nil {
rv.rev = string(item.Value)
}
if rv.rev == "" {
req, err := http.NewRequest("HEAD", baseDBURL+uniqueDB+"/unique_"+uuid, nil)
if err != nil {
rv.err = err
ch <- rv
return
}
req.Header.Set("Authorization", authHeader)
t := &urlfetch.Transport{Context: c}
resp, err := t.RoundTrip(req)
if err != nil {
rv.err = err
ch <- rv
return
}
if resp.StatusCode == 200 {
rv.rev = resp.Header.Get("etag")
if len(rv.rev) > 1 {
rv.rev = rv.rev[1 : len(rv.rev)-1]
}
} else {
c.Infof("Got unfavorable response for key: %v", resp.Status)
}
}
ch <- rv
}
// tileHandler implements a tile renderer for use with the Google Maps JavaScript API.
// See http://code.google.com/apis/maps/documentation/javascript/maptypes.html#ImageMapTypes
func tileHandler(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
x, _ := strconv.Atoi(r.FormValue("x"))
y, _ := strconv.Atoi(r.FormValue("y"))
z, _ := strconv.Atoi(r.FormValue("z"))
w.Header().Set("Content-Type", "image/png")
// Try memcache first.
key := fmt.Sprintf("mandelbrot:%d/%d/%d", x, y, z)
if z < maxMemcacheLevel {
if item, err := memcache.Get(c, key); err == nil {
w.Write(item.Value)
return
}
}
b := render(x, y, z)
if z < maxMemcacheLevel {
memcache.Set(c, &memcache.Item{
Key: key,
Value: b,
Expiration: 3600, // TTL = 1 hour
})
}
w.Header().Set("Content-Length", strconv.Itoa(len(b)))
w.Write(b)
}
func GetBuriggies(c appengine.Context, count int) (buriggies []*Buriggie, err error) {
var gg []*Buriggie
var cacheKey = "buriggies.list." + strconv.Itoa(count)
// Get the item from the memcache
if item, err := memcache.Get(c, cacheKey); err == memcache.ErrCacheMiss {
// cache miss.. ADD to cache
q := datastore.NewQuery("Greeting").Order("-Date").Limit(count)
_, err = q.GetAll(c, &gg)
qjs, _ := json.Marshal(gg)
cache_duration, _ := time.ParseDuration("1d")
// Create an Item - cache for a day
item := &memcache.Item{
Key: cacheKey,
Value: qjs,
Expiration: cache_duration,
}
if err := memcache.Add(c, item); err != nil {
c.Errorf("error setting item: %v", err)
}
} else if err != nil {
c.Errorf("error getting item: %v", err)
} else {
err = json.Unmarshal(item.Value, &gg)
}
return gg, err
}
