Golang Context.Debugf方法代碼示例

func UpdateFeed(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	gn := goon.FromContext(appengine.Timeout(c, time.Minute))
	url := r.FormValue("feed")
	if url == "" {
		c.Errorf("empty update feed")
		return
	}
	c.Debugf("update feed %s", url)
	last := len(r.FormValue("last")) > 0
	f := Feed{Url: url}
	s := ""
	defer func() {
		gn.Put(&Log{
			Parent: gn.Key(&f),
			Id:     time.Now().UnixNano(),
			Text:   "UpdateFeed - " + s,
		})
	}()
	if err := gn.Get(&f); err == datastore.ErrNoSuchEntity {
		c.Errorf("no such entity - " + url)
		s += "NSE"
		return
	} else if err != nil {
		s += "err - " + err.Error()
		return
	} else if last {
		// noop
	} else if time.Now().Before(f.NextUpdate) {
		c.Errorf("feed %v already updated: %v", url, f.NextUpdate)
		s += "already updated"
		return
	}

	feedError := func(err error) {
		s += "feed err - " + err.Error()
		f.Errors++
		v := f.Errors + 1
		const max = 24 * 7
		if v > max {
			v = max
		} else if f.Errors == 1 {
			v = 0
		}
		f.NextUpdate = time.Now().Add(time.Hour * time.Duration(v))
		gn.Put(&f)
		c.Warningf("error with %v (%v), bump next update to %v, %v", url, f.Errors, f.NextUpdate, err)
	}

	if feed, stories, err := fetchFeed(c, f.Url, f.Url); err == nil {
		if err := updateFeed(c, f.Url, feed, stories, false, false, last); err != nil {
			feedError(err)
		} else {
			s += "success"
		}
	} else {
		feedError(err)
	}
	f.Subscribe(c)
}

func UpdateFeedLast(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	gn := goon.FromContext(c)
	url := r.FormValue("feed")
	c.Debugf("update feed last %s", url)
	f := Feed{Url: url}
	if err := gn.Get(&f); err != nil {
		return
	}
	f.LastViewed = time.Now()
	gn.Put(&f)
}

func SubscribeCallback(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	gn := goon.FromContext(c)
	furl := r.FormValue("feed")
	b, _ := base64.URLEncoding.DecodeString(furl)
	f := Feed{Url: string(b)}
	c.Infof("url: %v", f.Url)
	if err := gn.Get(&f); err != nil {
		http.Error(w, "", http.StatusNotFound)
		return
	}
	if r.Method == "GET" {
		if f.NotViewed() || r.FormValue("hub.mode") != "subscribe" || r.FormValue("hub.topic") != f.Url {
			http.Error(w, "", http.StatusNotFound)
			return
		}
		w.Write([]byte(r.FormValue("hub.challenge")))
		i, _ := strconv.Atoi(r.FormValue("hub.lease_seconds"))
		f.Subscribed = time.Now().Add(time.Second * time.Duration(i))
		gn.PutMulti([]interface{}{&f, &Log{
			Parent: gn.Key(&f),
			Id:     time.Now().UnixNano(),
			Text:   "SubscribeCallback - subscribed - " + f.Subscribed.String(),
		}})
		c.Debugf("subscribed: %v - %v", f.Url, f.Subscribed)
		return
	} else if !f.NotViewed() {
		c.Infof("push: %v", f.Url)
		gn.Put(&Log{
			Parent: gn.Key(&f),
			Id:     time.Now().UnixNano(),
			Text:   "SubscribeCallback - push update",
		})
		defer r.Body.Close()
		b, _ := ioutil.ReadAll(r.Body)
		nf, ss, err := ParseFeed(c, r.Header.Get("Content-Type"), f.Url, f.Url, b)
		if err != nil {
			c.Errorf("parse error: %v", err)
			return
		}
		if err := updateFeed(c, f.Url, nf, ss, false, true, false); err != nil {
			c.Errorf("push error: %v", err)
		}
	} else {
		c.Infof("not viewed")
	}
}

func ImportOpmlTask(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	gn := goon.FromContext(c)
	userid := r.FormValue("user")
	bk := r.FormValue("key")
	del := func() {
		blobstore.Delete(c, appengine.BlobKey(bk))
	}

	var skip int
	if s, err := strconv.Atoi(r.FormValue("skip")); err == nil {
		skip = s
	}
	c.Debugf("reader import for %v, skip %v", userid, skip)

	d := xml.NewDecoder(blobstore.NewReader(c, appengine.BlobKey(bk)))
	d.CharsetReader = charset.NewReader
	d.Strict = false
	opml := Opml{}
	err := d.Decode(&opml)
	if err != nil {
		del()
		c.Warningf("gob decode failed: %v", err.Error())
		return
	}

	remaining := skip
	var userOpml []*OpmlOutline
	var proc func(label string, outlines []*OpmlOutline)
	proc = func(label string, outlines []*OpmlOutline) {
		for _, o := range outlines {
			if o.Title == "" {
				o.Title = o.Text
			}
			if o.XmlUrl != "" {
				if remaining > 0 {
					remaining--
				} else if len(userOpml) < IMPORT_LIMIT {
					userOpml = append(userOpml, &OpmlOutline{
						Title:   label,
						Outline: []*OpmlOutline{o},
					})
				}
			}

			if o.Title != "" && len(o.Outline) > 0 {
				proc(o.Title, o.Outline)
			}
		}
	}

	proc("", opml.Outline)

	// todo: refactor below with similar from ImportReaderTask
	wg := sync.WaitGroup{}
	wg.Add(len(userOpml))
	for i := range userOpml {
		go func(i int) {
			o := userOpml[i].Outline[0]
			if err := addFeed(c, userid, userOpml[i]); err != nil {
				c.Warningf("opml import error: %v", err.Error())
				// todo: do something here?
			}
			c.Debugf("opml import: %s, %s", o.Title, o.XmlUrl)
			wg.Done()
		}(i)
	}
	wg.Wait()

	ud := UserData{Id: "data", Parent: gn.Key(&User{Id: userid})}
	if err := gn.RunInTransaction(func(gn *goon.Goon) error {
		gn.Get(&ud)
		if err := mergeUserOpml(c, &ud, userOpml...); err != nil {
			return err
		}
		_, err := gn.Put(&ud)
		return err
	}, nil); err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		c.Errorf("ude update error: %v", err.Error())
		return
	}

	if len(userOpml) == IMPORT_LIMIT {
		task := taskqueue.NewPOSTTask(routeUrl("import-opml-task"), url.Values{
			"key":  {bk},
			"user": {userid},
			"skip": {strconv.Itoa(skip + IMPORT_LIMIT)},
		})
		taskqueue.Add(c, task, "import-reader")
	} else {
		del()
		c.Infof("opml import done: %v", userid)
	}
}

func updateFeed(c mpg.Context, url string, feed *Feed, stories []*Story, updateAll, fromSub, updateLast bool) error {
	gn := goon.FromContext(c)
	f := Feed{Url: url}
	if err := gn.Get(&f); err != nil {
		return fmt.Errorf("feed not found: %s", url)
	}
	gn.Put(&Log{
		Parent: gn.Key(&f),
		Id:     time.Now().UnixNano(),
		Text:   "feed update",
	})

	// Compare the feed's listed update to the story's update.
	// Note: these may not be accurate, hence, only compare them to each other,
	// since they should have the same relative error.
	storyDate := f.Updated

	hasUpdated := !feed.Updated.IsZero()
	isFeedUpdated := f.Updated.Equal(feed.Updated)
	if !hasUpdated {
		feed.Updated = f.Updated
	}
	feed.Date = f.Date
	feed.Average = f.Average
	feed.LastViewed = f.LastViewed
	f = *feed
	if updateLast {
		f.LastViewed = time.Now()
	}

	if hasUpdated && isFeedUpdated && !updateAll && !fromSub {
		c.Infof("feed %s already updated to %v, putting", url, feed.Updated)
		f.Updated = time.Now()
		scheduleNextUpdate(c, &f)
		gn.Put(&f)
		return nil
	}

	c.Debugf("hasUpdate: %v, isFeedUpdated: %v, storyDate: %v, stories: %v", hasUpdated, isFeedUpdated, storyDate, len(stories))
	puts := []interface{}{&f}

	// find non existant stories
	fk := gn.Key(&f)
	getStories := make([]*Story, len(stories))
	for i, s := range stories {
		getStories[i] = &Story{Id: s.Id, Parent: fk}
	}
	err := gn.GetMulti(getStories)
	if _, ok := err.(appengine.MultiError); err != nil && !ok {
		c.Errorf("GetMulti error: %v", err)
		return err
	}
	var updateStories []*Story
	for i, s := range getStories {
		if goon.NotFound(err, i) {
			updateStories = append(updateStories, stories[i])
		} else if (!stories[i].Updated.IsZero() && !stories[i].Updated.Equal(s.Updated)) || updateAll {
			if !s.Created.IsZero() {
				stories[i].Created = s.Created
			}
			if !s.Published.IsZero() {
				stories[i].Published = s.Published
			}
			updateStories = append(updateStories, stories[i])
		}
	}
	c.Debugf("%v update stories", len(updateStories))

	for _, s := range updateStories {
		puts = append(puts, s)
		sc := StoryContent{
			Id:     1,
			Parent: gn.Key(s),
		}
		buf := &bytes.Buffer{}
		if gz, err := gzip.NewWriterLevel(buf, gzip.BestCompression); err == nil {
			gz.Write([]byte(s.content))
			gz.Close()
			sc.Compressed = buf.Bytes()
		}
		if len(sc.Compressed) == 0 {
			sc.Content = s.content
		}
		if _, err := gn.Put(&sc); err != nil {
			c.Errorf("put sc err: %v", err)
			return err
		}
	}

	c.Debugf("putting %v entities", len(puts))
	if len(puts) > 1 {
		updateAverage(&f, f.Date, len(puts)-1)
		f.Date = time.Now()
		if !hasUpdated {
			f.Updated = f.Date
		}
	}
	scheduleNextUpdate(c, &f)
	if fromSub {
		wait := time.Now().Add(time.Hour * 6)
//.........這裏部分代碼省略.........