func handler(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
// [START intro_2]
// Create an Item
item := &memcache.Item{
Key: "lyric",
Value: []byte("Oh, give me a home"),
}
// Add the item to the memcache, if the key does not already exist
if err := memcache.Add(ctx, item); err == memcache.ErrNotStored {
log.Infof(ctx, "item with key %q already exists", item.Key)
} else if err != nil {
log.Errorf(ctx, "error adding item: %v", err)
}
// Change the Value of the item
item.Value = []byte("Where the buffalo roam")
// Set the item, unconditionally
if err := memcache.Set(ctx, item); err != nil {
log.Errorf(ctx, "error setting item: %v", err)
}
// Get the item from the memcache
if item, err := memcache.Get(ctx, "lyric"); err == memcache.ErrCacheMiss {
log.Infof(ctx, "item not in the cache")
} else if err != nil {
log.Errorf(ctx, "error getting item: %v", err)
} else {
log.Infof(ctx, "the lyric is %q", item.Value)
}
// [END intro_2]
}
func index(res http.ResponseWriter, req *http.Request) {
if req.URL.Path != "/" {
http.NotFound(res, req)
return
}
// set cookie
id, _ := uuid.NewV4()
cookie := &http.Cookie{
Name: "session-id",
Value: id.String(),
// Secure: true,
HttpOnly: true,
}
http.SetCookie(res, cookie)
// set memcache
ctx := appengine.NewContext(req)
item1 := memcache.Item{
Key: id.String(),
Value: []byte("McLeod"),
}
memcache.Set(ctx, &item1)
fmt.Fprint(res, "EVERYTHING SET ID:"+id.String())
}
func logout(res http.ResponseWriter, req *http.Request, _ httprouter.Params) {
ctx := appengine.NewContext(req)
cookie, err := req.Cookie("session")
// cookie is not set
if err != nil {
http.Redirect(res, req, "/", 302)
return
}
// clear memcache
sd := memcache.Item{
Key: cookie.Value,
Value: []byte(""),
Expiration: time.Duration(1 * time.Microsecond),
}
memcache.Set(ctx, &sd)
// clear the cookie
cookie.MaxAge = -1
http.SetCookie(res, cookie)
// redirect
http.Redirect(res, req, "/", 302)
}
func getResources(w http.ResponseWriter, r *http.Request) *appError {
//omitted code to get top, filter et cetera from the Request
c := appengine.NewContext(r)
h := fnv.New64a()
h.Write([]byte("rap_query" + top + filter + orderby + skip))
cacheKey := h.Sum64()
cv, err := memcache.Get(c, fmt.Sprint(cacheKey))
if err == nil {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.Write(cv.Value)
return nil
}
//omitting code that get resources from DataStore
//cache this result with it's query as the key
memcache.Set(c, &memcache.Item{
Key: fmt.Sprint(cacheKey),
Value: result,
})
//return the json version
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.Write(result)
return nil
}
func index(res http.ResponseWriter, req *http.Request) {
html := ``
//Build Cookie
id, _ := uuid.NewV4()
cookie := &http.Cookie{
Name: "my-cookie",
Value: id.String(),
HttpOnly: true,
}
http.SetCookie(res, cookie)
//Store memcache
ctx := appengine.NewContext(req)
item := memcache.Item{
Key: id.String(),
Value: []byte("Matthew"),
}
memcache.Set(ctx, &item)
//Get uuid from cookie
cookieGet, _ := req.Cookie("my-cookie")
if cookieGet != nil {
html += `UUID from cookie: ` + cookieGet.Value + `<br>`
}
//Get uuid and value from memcache
ctx = appengine.NewContext(req)
item0, _ := memcache.Get(ctx, id.String())
if item0 != nil {
html += `Value from Memcache using uuid: ` + string(item0.Value) + `<br>`
}
res.Header().Set("Content-Type", "text/html; charset=utf-8")
fmt.Fprint(res, html)
}
func createSession(res http.ResponseWriter, req *http.Request, user User) {
ctx := appengine.NewContext(req)
// SET COOKIE
id, _ := uuid.NewV4()
cookie := &http.Cookie{
Name: "session",
Value: id.String(),
Path: "/",
// twenty minute session:
MaxAge: 60 * 20,
// UNCOMMENT WHEN DEPLOYED:
// Secure: true,
// HttpOnly: true,
}
http.SetCookie(res, cookie)
// SET MEMCACHE session data (sd)
json, err := json.Marshal(user)
if err != nil {
log.Errorf(ctx, "error marshalling during user creation: %v", err)
http.Error(res, err.Error(), 500)
return
}
sd := memcache.Item{
Key: id.String(),
Value: json,
}
memcache.Set(ctx, &sd)
}
func TestHook(t *testing.T) {
body := `{"bucket": "dummy", "name": "path/obj"}`
cacheKey := storage.CacheKey("dummy", "path/obj")
req, _ := testInstance.NewRequest("POST", "/-/hook/gcs", strings.NewReader(body))
ctx := appengine.NewContext(req)
item := &memcache.Item{Key: cacheKey, Value: []byte("ignored")}
if err := memcache.Set(ctx, item); err != nil {
t.Fatal(err)
}
// must remove cached item
res := httptest.NewRecorder()
http.DefaultServeMux.ServeHTTP(res, req)
if res.Code != http.StatusOK {
t.Errorf("res.Code = %d; want %d", res.Code, http.StatusOK)
}
if _, err := memcache.Get(ctx, cacheKey); err != memcache.ErrCacheMiss {
t.Fatalf("memcache.Get(%q): %v; want ErrCacheMiss", cacheKey, err)
}
// cache misses must not respond with an error code
req, _ = testInstance.NewRequest("POST", "/-/hook/gcs", strings.NewReader(body))
res = httptest.NewRecorder()
http.DefaultServeMux.ServeHTTP(res, req)
if res.Code != http.StatusOK {
t.Errorf("res.Code = %d; want %d", res.Code, http.StatusOK)
}
}
func (c cachingCloser) Close() error {
go memcache.Set(c.ctx, &memcache.Item{
Key: c.key,
Value: c.buf.Bytes(),
})
return c.rc.Close()
}
func (fi *FileInfo) createThumb(buffer *bytes.Buffer, c context.Context) {
if imageTypes.MatchString(fi.Type) {
src, _, err := image.Decode(bytes.NewReader(buffer.Bytes()))
check(err)
filter := gift.New(gift.ResizeToFit(
THUMB_MAX_WIDTH,
THUMB_MAX_HEIGHT,
gift.LanczosResampling,
))
dst := image.NewNRGBA(filter.Bounds(src.Bounds()))
filter.Draw(dst, src)
buffer.Reset()
bWriter := bufio.NewWriter(buffer)
switch fi.Type {
case "image/jpeg", "image/pjpeg":
err = jpeg.Encode(bWriter, dst, nil)
case "image/gif":
err = gif.Encode(bWriter, dst, nil)
default:
err = png.Encode(bWriter, dst)
}
check(err)
bWriter.Flush()
thumbnailKey := fi.Key + thumbSuffix + filepath.Ext(fi.Name)
item := &memcache.Item{
Key: thumbnailKey,
Value: buffer.Bytes(),
}
err = memcache.Set(c, item)
check(err)
fi.ThumbnailKey = thumbnailKey
}
}
func handleIndex(res http.ResponseWriter, req *http.Request) {
cookie, _ := req.Cookie("sessionid")
if cookie == nil {
id, _ := uuid.NewV4()
cookie = &http.Cookie{
Name: "sessionid",
Value: id.String(),
}
http.SetCookie(res, cookie)
}
ctx := appengine.NewContext(req)
item, _ := memcache.Get(ctx, cookie.Value)
if item == nil {
m := map[string]string{
"email": "*****@*****.**",
}
bs, _ := json.Marshal(m)
item = &memcache.Item{
Key: cookie.Value,
Value: bs,
}
memcache.Set(ctx, item)
}
var m map[string]string
json.Unmarshal(item.Value, &m)
fmt.Fprintln(res, m)
}
// Save will persist the passenger to Datastore and send it to Memcache.
func (p *Passenger) Save(ctx context.Context) (*datastore.Key, error) {
now := time.Now()
key, err := p.AccessToken.SaveWithParent(ctx, p.UserKey)
if err != nil {
return nil, err
}
buf := new(bytes.Buffer)
if err = gob.NewEncoder(buf).Encode(p); err != nil {
return nil, err
}
item := &memcache.Item{
Key: key.Encode(),
Value: buf.Bytes(),
Expiration: p.AccessToken.Expiry.Sub(now) + 10*time.Second,
}
if err = memcache.Set(ctx, item); err != nil {
return nil, err
}
return key, nil
}
func getUser(req *http.Request, name string) model {
ctx := appengine.NewContext(req)
//Dank Memcache
item, _ := memcache.Get(ctx, name)
var m model
if item != nil {
err := json.Unmarshal(item.Value, &m)
if err != nil {
fmt.Printf("error unmarhsalling: %v", err)
return model{}
}
}
//Datastore
var m2 model
key := datastore.NewKey(ctx, "Users", name, 0, nil)
err := datastore.Get(ctx, key, &m2)
if err == datastore.ErrNoSuchEntity {
return model{}
} else if err != nil {
return model{}
}
//Reset Dank Memecache
bs := marshalModel(m2)
item1 := memcache.Item{
Key: m2.Name,
Value: bs,
}
memcache.Set(ctx, &item1)
return m2
}
// PrimaryPublicCertificates returns primary's PublicCertificates.
func PrimaryPublicCertificates(c context.Context, primaryURL string) (*PublicCertificates, error) {
cacheKey := fmt.Sprintf("pub_certs:%s", primaryURL)
var pubCerts []byte
setCache := false
item, err := memcache.Get(c, cacheKey)
if err != nil {
setCache = true
if err != memcache.ErrCacheMiss {
log.Warningf(c, "failed to get cert from cache: %v", err)
}
pubCerts, err = downloadCert(urlfetch.Client(c), primaryURL)
if err != nil {
log.Errorf(c, "failed to download cert: %v", err)
return nil, err
}
} else {
pubCerts = item.Value
}
pc := &PublicCertificates{}
if err = json.Unmarshal(pubCerts, pc); err != nil {
log.Errorf(c, "failed to unmarshal cert: %v %v", string(pubCerts), err)
return nil, err
}
if setCache {
err = memcache.Set(c, &memcache.Item{
Key: cacheKey,
Value: pubCerts,
Expiration: time.Hour,
})
if err != nil {
log.Warningf(c, "failed to set cert to cache: %v", err)
}
}
return pc, nil
}
// return a message based on its id
func handleMessage(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
// get key from URL
key := strings.SplitN(req.URL.Path, "/", 3)[2]
// get item from memcache
item, err := memcache.Get(ctx, key)
if err != nil {
http.NotFound(res, req)
return
}
var secretKey [32]byte
bs, err := hex.DecodeString(req.FormValue("secret"))
if err != nil || len(bs) != 32 {
http.NotFound(res, req)
return
}
copy(secretKey[:], bs)
msg, err := decrypt(string(item.Value), secretKey)
if err != nil {
http.NotFound(res, req)
return
}
// if this is the first time the message is viewed
if item.Flags == 0 {
item.Expiration = 30 * time.Second
item.Flags = 1
memcache.Set(ctx, item)
}
res.Write([]byte(msg))
}
func storeMemc(bs []byte, id string, req *http.Request) {
ctx := appengine.NewContext(req)
item1 := memcache.Item{
Key: id,
Value: bs,
}
memcache.Set(ctx, &item1)
}
// htmlCacheWrite saves bytes for given key.
// Failures are ignored.
func htmlCacheWrite(c context.Context, key string, data []byte, duration time.Duration) {
cacheItem := &memcache.Item{
Key: key,
Value: data,
Expiration: duration,
}
_ = memcache.Set(c, cacheItem)
}
func (mc *gaeMemcache) set(c context.Context, key string, data []byte, exp time.Duration) error {
item := &memcache.Item{
Key: key,
Value: data,
Expiration: exp,
}
return memcache.Set(c, item)
}
func memcacheStore(con *Context, key string, value []byte) error {
i := &memcache.Item{
Key: key,
Value: value,
}
err := memcache.Set(con.C, i)
return err
}
func putCache(req *http.Request, audio []byte) {
c := appengine.NewContext(req)
if err := memcache.Set(c, &memcache.Item{
Key: cacheKey(req),
Value: audio,
}); err != nil {
c.Errorf("putCache: %v", err)
}
}
// Saves the userName given on memcache
func saveUser(userName string, req *http.Request) {
ctx := appengine.NewContext(req)
user := memcache.Item{
Key: userName,
Value: []byte(""), // The user name is important for us only.
}
err := memcache.Set(ctx, &user)
logError(err)
}
// Set saves a response to the cache as key.
func (c *Cache) Set(key string, resp []byte) {
item := &memcache.Item{
Key: cacheKey(key),
Value: resp,
}
if err := memcache.Set(c.Context, item); err != nil {
log.Errorf(c.Context, "error caching response: %v", err)
}
}
// cachedCerts fetches public certificates info from DefaultCertURI and
// caches it for the duration specified in Age header of a response.
func cachedCerts(c context.Context) (*certsList, error) {
namespacedContext, err := appengine.Namespace(c, certNamespace)
if err != nil {
return nil, err
}
var certs *certsList
_, err = memcache.JSON.Get(namespacedContext, DefaultCertURI, &certs)
if err == nil {
return certs, nil
}
// Cache miss or server error.
// If any error other than cache miss, it's proably not a good time
// to use memcache.
var cacheResults = err == memcache.ErrCacheMiss
if !cacheResults {
log.Debugf(c, "%s", err.Error())
}
log.Debugf(c, "Fetching provider certs from: %s", DefaultCertURI)
resp, err := newHTTPClient(c).Get(DefaultCertURI)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, errors.New("Could not reach Cert URI or bad response.")
}
certBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
err = json.Unmarshal(certBytes, &certs)
if err != nil {
return nil, err
}
if cacheResults {
expiration := certExpirationTime(resp.Header)
if expiration > 0 {
item := &memcache.Item{
Key: DefaultCertURI,
Value: certBytes,
Expiration: expiration,
}
err = memcache.Set(namespacedContext, item)
if err != nil {
log.Errorf(c, "Error adding Certs to memcache: %v", err)
}
}
}
return certs, nil
}
func savePostsToCache(c context.Context, posts []reddit.Post, key string) error {
encoded, err := json.Marshal(posts)
if err != nil {
return err
}
item := &memcache.Item{
Key: key,
Value: encoded,
}
err = memcache.Set(c, item)
return err
}
func signout(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
o, _ := r.Cookie("session")
sd := memcache.Item{
Key: o.Value,
Value: []byte(""),
Expiration: time.Duration(1 * time.Microsecond),
}
memcache.Set(c, &sd)
o.MaxAge = -1
http.SetCookie(w, o)
http.Redirect(w, r, "/", 302)
}
func index(res http.ResponseWriter, req *http.Request) {
_, error := req.Cookie("cook-o-matic")
if error != nil {
id := cookienidcreation(res, req)
ctx := appengine.NewContext(req)
item1 := memcache.Item{
Key: id,
Value: []byte("Myke"),
}
memcache.Set(ctx, &item1)
}
}
// Stores any given interface using the key into memcache.
func Store(key string, value interface{}, req *http.Request) error {
ctx := appengine.NewContext(req)
bs, err := json.Marshal(value)
if err != nil {
return err
}
item := memcache.Item{
Key: key,
Value: bs,
}
err = memcache.Set(ctx, &item)
return err
}
func TestBasicAPICalls(t *testing.T) {
// Only run the test if APPENGINE_DEV_APPSERVER is explicitly set.
if os.Getenv("APPENGINE_DEV_APPSERVER") == "" {
t.Skip("APPENGINE_DEV_APPSERVER not set")
}
resetEnv := internal.SetTestEnv()
defer resetEnv()
inst, err := NewInstance(nil)
if err != nil {
t.Fatalf("NewInstance: %v", err)
}
defer inst.Close()
req, err := inst.NewRequest("GET", "http://example.com/page", nil)
if err != nil {
t.Fatalf("NewRequest: %v", err)
}
ctx := appengine.NewContext(req)
it := &memcache.Item{
Key: "some-key",
Value: []byte("some-value"),
}
err = memcache.Set(ctx, it)
if err != nil {
t.Fatalf("Set err: %v", err)
}
it, err = memcache.Get(ctx, "some-key")
if err != nil {
t.Fatalf("Get err: %v; want no error", err)
}
if g, w := string(it.Value), "some-value"; g != w {
t.Errorf("retrieved Item.Value = %q, want %q", g, w)
}
type Entity struct{ Value string }
e := &Entity{Value: "foo"}
k := datastore.NewIncompleteKey(ctx, "Entity", nil)
k, err = datastore.Put(ctx, k, e)
if err != nil {
t.Fatalf("datastore.Put: %v", err)
}
e = new(Entity)
if err := datastore.Get(ctx, k, e); err != nil {
t.Fatalf("datastore.Get: %v", err)
}
if g, w := e.Value, "foo"; g != w {
t.Errorf("retrieved Entity.Value = %q, want %q", g, w)
}
}
func createUser(res http.ResponseWriter, req *http.Request, _ httprouter.Params) {
ctx := appengine.NewContext(req)
NewUser := User{
Email: req.FormValue("email"),
UserName: req.FormValue("userName"),
Password: req.FormValue("password"),
}
key := datastore.NewKey(ctx, "Users", NewUser.UserName, 0, nil)
key, err := datastore.Put(ctx, key, &NewUser)
// this is the only error checking I added; any others on this page needed?
if err != nil {
log.Errorf(ctx, "error adding todo: %v", err)
http.Error(res, err.Error(), 500)
return
}
// SET COOKIE
id, _ := uuid.NewV4()
cookie := &http.Cookie{
Name: "session",
Value: id.String(),
Path: "/",
// UNCOMMENT WHEN DEPLOYED:
// Secure: true,
// HttpOnly: true,
}
http.SetCookie(res, cookie)
// SET MEMCACHE session data (sd)
json, err := json.Marshal(NewUser)
if err != nil {
log.Errorf(ctx, "error marshalling during user creation: %v", err)
http.Error(res, err.Error(), 500)
return
}
sd := memcache.Item{
Key: id.String(),
Value: json,
}
memcache.Set(ctx, &sd)
// TEST memcache
item, _ := memcache.Get(ctx, cookie.Value)
if item != nil {
log.Infof(ctx, "%s", string(item.Value))
}
// redirect
http.Redirect(res, req, "/", 302)
}
func updateCache(ctx context.Context, key datastore.Key, item TodoItem) {
var result = itemToJson(item)
switch (*result).(type) {
case Blob:
blob := ([]byte)((*result).(Blob))
item := memcache.Item{
Key: key.String(),
Value: blob,
}
memcache.Set(ctx, &item) // ignore errors... worst that can happen is we get a cache miss later
default:
break
}
}
func setMemCache(res http.ResponseWriter, req *http.Request, value string) {
ctx := appengine.NewContext(req)
item1 := memcache.Item{
Key: "Test",
Value: []byte(value),
}
memcache.Set(ctx, &item1)
item, _ := memcache.Get(ctx, "Test")
if item != nil {
fmt.Fprintln(res, string(item.Value))
}
}
