Golang Context.Errorf方法代码示例

func DeleteArticlesWithinScope(c appengine.Context, scope ArticleScope) error {
	ancestorKey, err := scope.key(c)
	if err != nil {
		return err
	}

	batchWriter := NewBatchWriter(c, BatchDelete)

	q := datastore.NewQuery("Article").Ancestor(ancestorKey).KeysOnly()
	for t := q.Run(c); ; {
		articleKey, err := t.Next(nil)

		if err == datastore.Done {
			break
		} else if err != nil {
			return err
		}

		if err := batchWriter.EnqueueKey(articleKey); err != nil {
			c.Errorf("Error queueing article for batch delete: %s", err)
			return err
		}
	}

	if err := batchWriter.Flush(); err != nil {
		c.Errorf("Error flushing batch queue: %s", err)
		return err
	}

	return nil
}

func searchGroup(name string, c appengine.Context) (key *datastore.Key, group *Group, err error) {
	var v []Group
	// Initial variables
	key = nil
	group = nil
	err = nil

	// Query
	f := datastore.NewQuery(GroupKind)
	f = f.Filter("Name=", name)
	k, err := f.GetAll(c, &v)
	if err != nil {
		c.Errorf("%s in getting data from datastore\n", err)
		err = errors.New("Datastore is temporary unavailable")
		return
	}

	if k == nil || len(k) == 0 {
		return
	}

	key = k[0]
	group = &v[0]
	return
}

func addLogo(profilePtr *image.Image, logo string, context appengine.Context) []byte {
	profileImage := *profilePtr
	destImage := image.NewRGBA(profileImage.Bounds())
	draw.Draw(destImage, destImage.Bounds(), profileImage, image.ZP, draw.Src)

	if logoImages, ok := THELOGOIMAGES[logo]; ok {
		randi := rand.Intn(len(logoImages))
		logoImage := logoImages[randi]

		offset := image.Pt(5, 5)
		if strings.HasPrefix(logo, "NLD-") {
			offset = image.Pt(0, 0)
		}

		start := profileImage.Bounds().Size()
		start = start.Sub(offset)
		start = start.Sub(logoImage.Bounds().Size())

		bounds := image.Rectangle{start, start.Add(logoImage.Bounds().Size())}
		draw.Draw(destImage, bounds, logoImage, image.ZP, draw.Over)

	} else {
		context.Errorf("Cannot load logoimage for %s", logo)
	}

	buffer := new(bytes.Buffer)
	err := png.Encode(buffer, destImage)
	check(err, context)

	return buffer.Bytes()
}

func writeEncoded(c appengine.Context, w http.ResponseWriter, data interface{}) {
	newEncoder := bencode.NewEncoder(w)
	if err := newEncoder.Encode(data); err != nil {
		c.Errorf("Failed to encode data: %s", err)
		writeInternalError(w)
	}
}

func count_uv_pv(c appengine.Context, mins int) (uv int, pv int) {
	count := 0
	uniq := make(map[string]bool)
	query := &log.Query{
		AppLogs:   true,
		StartTime: time.Now().Add(time.Duration(-1*mins) * time.Minute),
		Versions:  []string{"1"},
	}
	for results := query.Run(c); ; {
		record, err := results.Next()
		if err == log.Done {
			break
		}
		if err != nil {
			c.Errorf("Failed to retrieve next log: %v", err)
		}

		if len(record.AppLogs) > 0 && strings.Index(record.Combined, "GET "+config.URL_BEACON) > 0 {
			zcookie := record.AppLogs[0].Message
			if zcookie != "" {
				count++
				uniq[zcookie] = true
			}
		}
	}
	uv = len(uniq)
	pv = count
	return
}

func HandleEvent(tags *event.EventHeaderTags, ev event.Event, ctx appengine.Context, sender EventSendService) error {
	res, err := handleRecvEvent(tags, ev, ctx)
	if nil != err {
		ctx.Errorf("Failed to handle event[%d:%d] for reason:%v", ev.GetType(), ev.GetVersion(), err)
		return err
	}
	if nil == res {
		var empty bytes.Buffer
		sender.Send(&empty)
		return nil
	}
	res.SetHash(ev.GetHash())
	compressType := Cfg.CompressType
	if httpres, ok := res.(*event.HTTPResponseEvent); ok {
		v := httpres.GetHeader("Content-Type")
		if len(v) > 0 && Cfg.CompressType != event.COMPRESSOR_NONE {
			if isContentTypeInCompressFilter(v) {
				compressType = event.COMPRESSOR_NONE
			}
		}
	}
	x := new(event.CompressEvent)
	x.SetHash(ev.GetHash())
	x.CompressType = compressType
	x.Ev = res
	y := new(event.EncryptEvent)
	y.SetHash(ev.GetHash())
	y.EncryptType = Cfg.EncryptType
	y.Ev = x
	var buf bytes.Buffer
	tags.Encode(&buf)
	event.EncodeEvent(&buf, y)
	sender.Send(&buf)
	return nil
}

func load(c appengine.Context, id string) (*Group, error) {
	group := &Group{}
	_, err := memcache.JSON.Get(c, id, group)
	if err == nil {
		return group, nil
	}
	if err != memcache.ErrCacheMiss {
		c.Errorf("memcache get %q: %v", id, err)
	}

	group, err = fetch(c, id)
	if err != nil {
		return nil, err
	}

	item := &memcache.Item{
		Key:        id,
		Object:     group,
		Expiration: time.Hour,
	}
	err = memcache.JSON.Set(c, item)
	if err != nil {
		c.Errorf("memcache set %q: %v", id, err)
	}
	return group, nil
}

func GetAllClassesFromProds(c appengine.Context) []T {
	c.Infof("GetAllClassesFromProds: Enter")
	const cacheKey_product_classes = "product_classes"
	var item_list []T
	_, err := memcache.JSON.Get(c, cacheKey_product_classes, &item_list)
	if err != nil {
		//Memcache failed to extract the list.
		c.Infof("GetAllClassesFromProds: Unable to retrieve list from Memcache: %v", err)
		item_list = datastoreGetAllClassesFromProds(c)
		memcache_item := &memcache.Item{
			Key:        cacheKey_product_classes,
			Object:     item_list,
			Expiration: oneDay,
		}
		//Store into Memcache
		// Add the item to the memcache, if the key does not already exist
		if err := memcache.JSON.Set(c, memcache_item); err == memcache.ErrNotStored {
			c.Infof("item with key %q already exists", memcache_item.Key)
		} else if err != nil {
			c.Errorf("error adding item: %v", err)
		} else {

			c.Infof("got stored as json ")
		}
	}
	return item_list

}

func update(ctxt appengine.Context, kind string, data interface{}) error {
	updaters.RLock()
	up := updaters.m[kind]
	updaters.RUnlock()

	t := reflect.TypeOf(data)
	dv, _ := strconv.Atoi(t.Elem().Field(0).Tag.Get("dataversion"))
	if dv == 0 {
		return nil
	}
	v := reflect.ValueOf(data)
	v.Elem().Field(0).SetInt(int64(dv))
	for _, fv := range up {
		if fv.Type().In(0) != t {
			return fmt.Errorf("type mismatch for data kind %q: cannot apply updater %s to %T", kind, fv.Type(), data)
		}
		rv := fv.Call([]reflect.Value{v})
		if len(rv) > 0 {
			err := rv[0].Interface().(error)
			if err != nil {
				ctxt.Errorf("applying updater: %v", err)
				return fmt.Errorf("applying updater: %v", err)
			}
		}
	}
	return nil
}

func (r *Room) Send(c appengine.Context, message string) error {
	var clients []Client

	_, err := memcache.JSON.Get(c, r.Name, &clients)
	if err != nil && err != memcache.ErrCacheMiss {
		return err
	}

	if err == memcache.ErrCacheMiss {
		q := datastore.NewQuery("Client").Ancestor(r.Key(c))
		_, err = q.GetAll(c, &clients)
		if err != nil {
			return err
		}
		err = memcache.JSON.Set(c, &memcache.Item{
			Key: r.Name, Object: clients,
		})
		if err != nil {
			return err
		}
	}

	for _, client := range clients {
		err = channel.Send(c, client.ClientID, message)
		if err != nil {
			c.Errorf("sending %q: %v", message, err)
		}
	}

	return nil
}

func PutInBlobstore(c appengine.Context, toStore interface{}) (appengine.BlobKey, error) {
	//TODO: check capabilities
	var k appengine.BlobKey
	var data bytes.Buffer
	enc := gob.NewEncoder(&data)
	err := enc.Encode(toStore)
	if err != nil {
		c.Errorf("Datastore - PutInBlobstore - error 1 - %s", err)
		return k, err
	}

	w, err := blobstore.Create(c, "application/octet-stream")
	if err != nil {
		c.Errorf("Datastore - PutInBlobstore - error 2 - %s", err)
		return k, err
	}
	_, err = w.Write(data.Bytes())
	if err != nil {
		c.Errorf("Datastore - PutInBlobstore - error 3 - %s", err)
		return k, err
	}
	err = w.Close()
	if err != nil {
		c.Errorf("Datastore - PutInBlobstore - error 4 - %s", err)
		return k, err
	}
	k, err = w.Key()
	if err != nil {
		c.Errorf("Datastore - PutInBlobstore - error 5 - %s", err)
	}
	return k, err
}

func unregisterUser(addr string, c appengine.Context) {
	q := datastore.NewQuery(USER_MODEL).
		Filter("Email =", addr).
		KeysOnly()
	keys, err := q.GetAll(c, nil)
	if err != nil {
		c.Errorf("Cound not query the model for %s: %v", addr, err)
		return
	}
	if len(keys) == 0 {
		c.Infof("No such user to unregister: %s", addr)
		return
	}
	for i := range keys {
		datastore.Delete(c, keys[i])
	}
	c.Infof("Removed user %s", addr)

	msg := &gaeMail.Message{
		Sender:  "[email protected]",
		To:      []string{addr},
		Subject: "Email unregistered",
		Body:    "user " + addr + " has been unregistered",
	}
	gaeMail.Send(c, msg)
}

func sendSubscription(addr string, c appengine.Context) {
	code := getSubCode()
	msg := &gaeMail.Message{
		Sender:  "[email protected]",
		To:      []string{addr},
		Subject: "confirm " + code,
		Body:    "Reply without changing subject",
	}
	if err := gaeMail.Send(c, msg); err != nil {
		c.Errorf("Couldn't send email to %s for %s: %v", addr, code, err)
	}

	// XXXX if successful, register the code as (email, code, 0 (retry)) tuple.
	confirmation := Confirmation{
		Email: addr,
		Code:  code,
		Retry: 0,
	}

	_, err := datastore.Put(c,
		datastore.NewIncompleteKey(c, CONFIRM_MODEL, nil),
		&confirmation)
	if err != nil {
		c.Errorf("Couldn't write confirmation code for %s, %s: %v", addr, code, err)
		return
	}
	c.Infof("Wrote confirmation successfully for %s, %s", addr, code)
}

// send uses the Channel API to send the provided message in JSON-encoded form
// to the client identified by clientID.
//
// Channels created with one version of an app (eg, the default frontend)
// cannot be sent on from another version (eg, a backend). This is a limitation
// of the Channel API that should be fixed at some point.
// The send function creates a task that runs on the frontend (where the
// channel was created). The task handler makes the channel.Send API call.
func send(c appengine.Context, clientID string, m Message) {
	if clientID == "" {
		c.Debugf("no channel; skipping message send")
		return
	}
	switch {
	case m.TilesDone:
		c.Debugf("tiles done")
	case m.ZipDone:
		c.Debugf("zip done")
	default:
		c.Debugf("%d tiles", len(m.IDs))
	}
	b, err := json.Marshal(m)
	if err != nil {
		panic(err)
	}
	task := taskqueue.NewPOSTTask("/send", url.Values{
		"clientID": {clientID},
		"msg":      {string(b)},
	})
	host := appengine.DefaultVersionHostname(c)
	task.Header.Set("Host", host)
	if _, err := taskqueue.Add(c, task, sendQueue); err != nil {
		c.Errorf("add send task failed: %v", err)
	}
}

func TriggerBatchProcessing(c appengine.Context, article ArticleId) error {
	// Instead of submitting a task to match incoming bids, resulting in one task per bid,
	// we collect bids for up to two seconds and batch-process them afterwards.
	semaphoreKey := "semaphore-" + string(article)
	if semaphore, err := memcache.Increment(c, semaphoreKey, 1, 0); err != nil {
		return err
	} else if semaphore >= 2 {
		c.Infof("Batch processing already triggered for article %v", article)
		memcache.IncrementExisting(c, semaphoreKey, -1)
		return nil
	} else {
		time.Sleep(1 * time.Second)
		c.Infof("Starting batch processing...")
		memcache.IncrementExisting(c, semaphoreKey, -1)
		time_before := time.Now()
		matchingErr := MatchIncomingBids(c, article)
		time_after := time.Now()
		duration := time_after.Sub(time_before)
		if duration > 1000*time.Millisecond {
			c.Errorf("Batch processing finished after %v. Limit exceeded!", duration)
		} else if duration > 500*time.Millisecond {
			c.Warningf("Batch processing finished after %v. Limit in danger.", duration)
		} else {
			c.Infof("Batch processing finished after %v.", duration)
		}
		return matchingErr
	}
}