Golang Context.Errorf方法代碼示例

func Main(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	if err := templates.ExecuteTemplate(w, "base.html", includes(c, w, r)); err != nil {
		c.Errorf("%v", err)
		serveError(w, err)
		return
	}
}

func CFix(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	gn := goon.FromContext(c)
	url := r.FormValue("feed")
	c.Infof("fix feed %s", url)
	f := Feed{Url: url}
	if err := gn.Get(&f); err != nil {
		c.Criticalf("cfix err: %v", err)
		serveError(w, err)
		return
	}

	q := datastore.NewQuery("S").Ancestor(gn.Key(&f))
	var ss []*Story
	keys, err := q.GetAll(c, &ss)
	if err != nil {
		c.Errorf("getall err: %v", err)
		serveError(w, err)
		return
	}
	c.Infof("trying to fix %v stories", len(ss))
	const putLimit = 500
	for i := 0; i <= len(keys)/putLimit; i++ {
		lo := i * putLimit
		hi := (i + 1) * putLimit
		if hi > len(keys) {
			hi = len(keys)
		}
		c.Infof("%v - %v", lo, hi)
		if _, err := datastore.PutMulti(c, keys[lo:hi], ss[lo:hi]); err != nil {
			c.Errorf("err: %v, %v, %v", lo, hi, err)
		}
	}
}

func AddSubscription(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	backupOPML(c)
	cu := user.Current(c)
	url := r.FormValue("url")
	o := &OpmlOutline{
		Outline: []*OpmlOutline{
			&OpmlOutline{XmlUrl: url},
		},
	}
	if err := addFeed(c, cu.ID, o); err != nil {
		c.Errorf("add sub error (%s): %s", url, err.Error())
		serveError(w, err)
		return
	}

	gn := goon.FromContext(c)
	ud := UserData{Id: "data", Parent: gn.Key(&User{Id: cu.ID})}
	gn.Get(&ud)
	if err := mergeUserOpml(c, &ud, o); err != nil {
		c.Errorf("add sub error opml (%v): %v", url, err)
		serveError(w, err)
		return
	}
	gn.PutMany(&ud, &Log{
		Parent: ud.Parent,
		Id:     time.Now().UnixNano(),
		Text:   fmt.Sprintf("add sub: %v", url),
	})
	if r.Method == "GET" {
		http.Redirect(w, r, routeUrl("main"), http.StatusFound)
	}
	backupOPML(c)
}

func Charge(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	cu := user.Current(c)
	gn := goon.FromContext(c)
	u := User{Id: cu.ID}
	uc := UserCharge{Id: 1, Parent: gn.Key(&u)}
	if err := gn.Get(&u); err != nil {
		serveError(w, err)
		return
	} else if u.Account != AFree {
		serveError(w, fmt.Errorf("You're already subscribed."))
		return
	}
	if err := gn.Get(&uc); err == nil && len(uc.Customer) > 0 {
		serveError(w, fmt.Errorf("You're already subscribed."))
		return
	} else if err != datastore.ErrNoSuchEntity {
		serveError(w, err)
		return
	}
	resp, err := stripe(c, "POST", "customers", url.Values{
		"email":       {u.Email},
		"description": {u.Id},
		"card":        {r.FormValue("stripeToken")},
		"plan":        {STRIPE_PLAN},
	}.Encode())
	if err != nil {
		serveError(w, err)
		return
	} else if resp.StatusCode != http.StatusOK {
		c.Errorf("%s", resp.Body)
		serveError(w, fmt.Errorf("Error"))
		return
	}
	defer resp.Body.Close()
	b, _ := ioutil.ReadAll(resp.Body)
	var sc StripeCustomer
	if err := json.Unmarshal(b, &sc); err != nil {
		serveError(w, err)
		return
	}
	if err := gn.RunInTransaction(func(gn *goon.Goon) error {
		if err := gn.Get(&u); err != nil && err != datastore.ErrNoSuchEntity {
			return err
		}
		if err := gn.Get(&uc); err != nil && err != datastore.ErrNoSuchEntity {
			return err
		}
		u.Account = APaid
		uc.Customer = sc.Id
		uc.Last4 = sc.Card.Last4
		uc.Created = time.Unix(sc.Created, 0)
		_, err := gn.PutMany(&u, &uc)
		return err
	}, nil); err != nil {
		serveError(w, err)
		return
	}
	b, _ = json.Marshal(&uc)
	w.Write(b)
}

func doUncheckout(c mpg.Context) (*UserCharge, error) {
	cu := user.Current(c)
	gn := goon.FromContext(c)
	u := User{Id: cu.ID}
	uc := UserCharge{Id: 1, Parent: gn.Key(&u)}
	if err := gn.Get(&u); err != nil {
		return nil, err
	}
	if err := gn.Get(&uc); err != nil || len(uc.Customer) == 0 {
		return nil, err
	}
	resp, err := stripe(c, "DELETE", "customers/"+uc.Customer, "")
	if err != nil {
		return nil, err
	} else if resp.StatusCode != http.StatusOK {
		c.Errorf("%s", resp.Body)
		c.Errorf("stripe delete error, but proceeding")
	}
	if err := gn.RunInTransaction(func(gn *goon.Goon) error {
		if err := gn.Get(&u); err != nil && err != datastore.ErrNoSuchEntity {
			return err
		}
		u.Account = AFree
		u.Until = uc.Next
		if err := gn.Delete(gn.Key(&uc)); err != nil {
			return err
		}
		_, err := gn.Put(&u)
		return err
	}, nil); err != nil {
		return nil, err
	}
	return &uc, nil
}

func UploadOpml(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	opml := Opml{}
	if err := json.Unmarshal([]byte(r.FormValue("opml")), &opml.Outline); err != nil {
		serveError(w, err)
		return
	}
	backupOPML(c)
	cu := user.Current(c)
	gn := goon.FromContext(c)
	u := User{Id: cu.ID}
	ud := UserData{Id: "data", Parent: gn.Key(&u)}
	if err := gn.Get(&ud); err != nil {
		serveError(w, err)
		c.Errorf("get err: %v", err)
		return
	}
	if b, err := json.Marshal(&opml); err != nil {
		serveError(w, err)
		c.Errorf("json err: %v", err)
		return
	} else {
		l := Log{
			Parent: ud.Parent,
			Id:     time.Now().UnixNano(),
			Text:   fmt.Sprintf("upload opml: %v -> %v", len(ud.Opml), len(b)),
		}
		ud.Opml = b
		if _, err := gn.PutMany(&ud, &l); err != nil {
			serveError(w, err)
			return
		}
		backupOPML(c)
	}
}

func FeedHistory(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	cu := user.Current(c)
	gn := goon.FromContext(c)
	u := User{Id: cu.ID}
	uk := gn.Key(&u)
	if v := r.FormValue("v"); len(v) == 0 {
		q := datastore.NewQuery(gn.Key(&UserOpml{}).Kind()).Ancestor(uk).KeysOnly()
		keys, err := gn.GetAll(q, nil)
		if err != nil {
			serveError(w, err)
			return
		}
		times := make([]string, len(keys))
		for i, k := range keys {
			times[i] = strconv.FormatInt(k.IntID(), 10)
		}
		b, _ := json.Marshal(&times)
		w.Write(b)
	} else {
		a, _ := strconv.ParseInt(v, 10, 64)
		uo := UserOpml{Id: a, Parent: uk}
		c.Errorf("k: %v", uo)
		if err := gn.Get(&uo); err != nil {
			serveError(w, err)
			return
		}
		downloadOpml(w, uo.opml(), cu.Email)
	}
}

func UpdateFeeds(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	q := datastore.NewQuery("F").KeysOnly().Filter("n <=", time.Now())
	q = q.Limit(10 * 60 * 2) // 10/s queue, 2 min cron
	it := q.Run(appengine.Timeout(c, time.Minute))
	tc := make(chan *taskqueue.Task)
	done := make(chan bool)
	i := 0
	u := routeUrl("update-feed")
	go taskSender(c, "update-feed", tc, done)
	for {
		k, err := it.Next(nil)
		if err == datastore.Done {
			break
		} else if err != nil {
			c.Errorf("next error: %v", err.Error())
			break
		}
		tc <- taskqueue.NewPOSTTask(u, url.Values{
			"feed": {k.StringID()},
		})
		i++
	}
	close(tc)
	<-done
	c.Infof("updating %d feeds", i)
}

func Donate(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	cu := user.Current(c)
	gn := goon.FromContext(c)
	u := User{Id: cu.ID}
	if err := gn.Get(&u); err != nil {
		serveError(w, err)
		return
	}
	amount, err := strconv.Atoi(r.FormValue("amount"))
	if err != nil || amount < 200 {
		serveError(w, fmt.Errorf("bad amount: %v", r.FormValue("amount")))
		return
	}
	resp, err := stripe(c, "POST", "charges", url.Values{
		"amount":      {r.FormValue("amount")},
		"description": {fmt.Sprintf("%v - %v", u.Id, u.Email)},
		"card":        {r.FormValue("stripeToken")},
		"currency":    {"usd"},
	}.Encode())
	if err != nil {
		serveError(w, err)
		return
	} else if resp.StatusCode != http.StatusOK {
		c.Errorf("%s", resp.Body)
		serveError(w, fmt.Errorf("Error"))
		return
	}
}

func UploadOpml(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	opml := Opml{}
	if err := json.Unmarshal([]byte(r.FormValue("opml")), &opml.Outline); err != nil {
		serveError(w, err)
		return
	}
	backupOPML(c)
	cu := user.Current(c)
	gn := goon.FromContext(c)
	u := User{Id: cu.ID}
	ud := UserData{Id: "data", Parent: gn.Key(&u)}
	if err := gn.Get(&ud); err != nil {
		serveError(w, err)
		c.Errorf("get err: %v", err)
		return
	}
	if b, err := json.Marshal(&opml); err != nil {
		saveError(c, fmt.Sprintf("%v", opml), err)
		serveError(w, err)
		c.Errorf("json err: %v", err)
		return
	} else {
		ud.Opml = b
	}
	gn.Put(&ud)
	backupOPML(c)
}

func UpdateFeeds(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	gn := goon.FromContext(c)
	q := datastore.NewQuery(gn.Key(&Feed{}).Kind()).KeysOnly()
	q = q.Filter("n <=", time.Now()).Limit(3000)
	it := gn.Run(q)
	i := 0
	for {
		k, err := it.Next(nil)
		if err == datastore.Done {
			break
		} else if err != nil {
			c.Errorf("next error: %v", err.Error())
			break
		}
		t := taskqueue.NewPOSTTask(routeUrl("update-feed"), url.Values{
			"feed": {k.StringID()},
		})
		if _, err := taskqueue.Add(c, t, "update-feed"); err != nil {
			c.Errorf("taskqueue error: %v", err.Error())
		}
		i++
	}
	c.Infof("updating %d feeds", i)
	fmt.Fprintf(w, "updating %d feeds", i)
}

func SubscribeCallback(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	gn := goon.FromContext(c)
	vars := mux.Vars(r)
	b, _ := base64.URLEncoding.DecodeString(vars["feed"])
	f := Feed{Url: string(b)}
	if err := gn.Get(&f); err != nil {
		http.Error(w, "", http.StatusNotFound)
		return
	}
	if r.Method == "GET" {
		if 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.Put(&f)
		c.Debugf("subscribed: %v - %v", f.Url, f.Subscribed)
		return
	} else {
		c.Infof("push: %v", f.Url)
		defer r.Body.Close()
		b, _ := ioutil.ReadAll(r.Body)
		nf, ss := ParseFeed(c, f.Url, b)
		err := updateFeed(c, f.Url, nf, ss)
		if err != nil {
			c.Errorf("push error: %v", err)
		}
	}
}

func UpdateFeeds(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	gn := goon.FromContext(c)
	q := datastore.NewQuery(gn.Key(&Feed{}).Kind()).KeysOnly()
	q = q.Filter("n <=", time.Now())
	retry, _ := strconv.Atoi(r.FormValue("retry"))
	c.Errorf("retry: %v", retry)

	//* iterator
	it := gn.Run(q)
	i := 0
	done := false
	for {
		k, err := it.Next(nil)
		if err == datastore.Done {
			done = true
			break
		} else if err != nil {
			c.Errorf("next error: %v", err.Error())
			break
		}
		t := taskqueue.NewPOSTTask(routeUrl("update-feed"), url.Values{
			"feed": {k.StringID()},
		})
		if _, err := taskqueue.Add(c, t, "update-feed"); err != nil {
			c.Errorf("taskqueue error: %v", err.Error())
		}
		i++
	}
	c.Infof("updating %d feeds", i)
	fmt.Fprintf(w, "updating %d feeds", i)
	if !done {
		time.Sleep(time.Second * time.Duration(i) / 50) // sleep about the time it'll take to process them
		t := taskqueue.NewPOSTTask("/tasks/update-feeds", url.Values{
			"retry": {strconv.Itoa(retry + 1)},
		})
		if _, err := taskqueue.Add(c, t, "update-feeds"); err != nil {
			c.Errorf("taskqueue update feeds error: %v", err.Error())
		}
		c.Errorf("ran update again")
		fmt.Fprintf(w, "\nran update again")
	}
	//*/

	/* get all
	q = q.Limit(1000)
	keys, _ := gn.GetAll(q, nil)
	for _, k := range keys {
		t := taskqueue.NewPOSTTask(routeUrl("update-feed"), url.Values{
			"feed": {k.StringID()},
		})
		if _, err := taskqueue.Add(c, t, "update-feed"); err != nil {
			c.Errorf("taskqueue error: %v", err.Error())
		}
	}
	c.Infof("updating %d feeds", len(keys))
	fmt.Fprintf(w, "updating %d feeds", len(keys))
	//*/
}

func ImportOpml(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	cu := user.Current(c)
	gn := goon.FromContext(c)
	u := User{Id: cu.ID}
	if err := gn.Get(&u); err != nil {
		serveError(w, err)
		return
	}
	backupOPML(c)

	if file, _, err := r.FormFile("file"); err == nil {
		if fdata, err := ioutil.ReadAll(file); err == nil {
			buf := bytes.NewReader(fdata)
			// attempt to extract from google reader takeout zip
			if zb, zerr := zip.NewReader(buf, int64(len(fdata))); zerr == nil {
				for _, f := range zb.File {
					if strings.HasSuffix(f.FileHeader.Name, "Reader/subscriptions.xml") {
						if rc, rerr := f.Open(); rerr == nil {
							if fb, ferr := ioutil.ReadAll(rc); ferr == nil {
								fdata = fb
								break
							}
						}
					}
				}
			}

			// Preflight the OPML, so we can report any errors.
			d := xml.NewDecoder(bytes.NewReader(fdata))
			d.CharsetReader = charset.NewReader
			d.Strict = false
			opml := Opml{}
			if err := d.Decode(&opml); err != nil {
				serveError(w, err)
				c.Errorf("opml error: %v", err.Error())
				return
			}

			var b bytes.Buffer
			enc := gob.NewEncoder(&b)
			err := enc.Encode(&opml)
			if err != nil {
				serveError(w, err)
				return
			}
			bk, err := saveFile(c, b.Bytes())
			if err != nil {
				serveError(w, err)
				return
			}
			task := taskqueue.NewPOSTTask(routeUrl("import-opml-task"), url.Values{
				"key":  {string(bk)},
				"user": {cu.ID},
			})
			taskqueue.Add(c, task, "import-reader")
		}
	}
}

func SitemapFeed(c mpg.Context, w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	feed := vars["feed"]
	fk, err := datastore.DecodeKey(feed)
	if err != nil {
		serveError(w, err)
		return
	}
	bf := base64.URLEncoding.EncodeToString([]byte(fk.StringID()))
	q := datastore.NewQuery("S").KeysOnly().Ancestor(fk)
	q = q.Limit(Limit)
	cs := r.FormValue("c")
	if len(cs) > 0 {
		if cur, err := datastore.DecodeCursor(cs); err == nil {
			q = q.Start(cur)
		}
	}
	stories := make(map[string]string)
	it := q.Run(c)
	for {
		k, err := it.Next(nil)
		if err == datastore.Done {
			break
		} else if err != nil {
			c.Errorf("next error: %v", err)
			break
		}
		stories[k.StringID()] = base64.URLEncoding.EncodeToString([]byte(k.StringID()))
	}
	cs = ""
	if len(stories) == Limit {
		if cur, err := it.Cursor(); err == nil {
			cs = cur.String()
		}
	}
	if err := templates.ExecuteTemplate(w, "sitemap-feed.html", struct {
		Feed, Feed64 string
		Stories      map[string]string
		Cursor       string
	}{
		Feed:    feed,
		Feed64:  bf,
		Stories: stories,
		Cursor:  cs,
	}); err != nil {
		c.Errorf("%v", err)
		serveError(w, err)
		return
	}
}