Golang datastore.NewKey函数代码示例

//save article and save tags transaction
func (this *ArticleMetaData) Save(ctx Context) (err error) {
	c := ctx.GAEContext
	uuid, err := GenUUID()
	if err != nil {
		return err
	}
	this.Id = uuid
	k := datastore.NewKey(c, "Article", uuid, 0, nil)

	err = datastore.RunInTransaction(c, func(c appengine.Context) error {
		if len(this.Tags) > 0 {
			tags := make([]Tags, len(this.Tags))
			tagsKey := make([]*datastore.Key, len(this.Tags))
			for id, tag := range this.Tags {
				tags[id].ArticleId = uuid
				tags[id].Tag = tag
				tagId := uuid + tag
				tagsKey[id] = datastore.NewKey(c, "Tags", tagId, 0, nil)
			}
			_, err = datastore.PutMulti(c, tagsKey, tags)
			if err != nil {
				return err
			}
		}
		_, err = datastore.Put(c, k, this)
		return err

	}, &datastore.TransactionOptions{XG: true})

	return err
}

func showFeed(w http.ResponseWriter, r *http.Request) {
	c := appengine.NewContext(r)
	url, err := url.QueryUnescape(r.URL.RawQuery)
	if err != nil {
		handleError(w, err)
		return
	}
	feedRoot := datastore.NewKey(c, "feedRoot", "feedRoot", 0, nil)
	fk := datastore.NewKey(c, "feed", url, 0, feedRoot)
	f := new(RSS)
	err = datastore.Get(c, fk, f)
	if err != nil {
		handleError(w, err)
		return
	}
	_, err = datastore.NewQuery("item").Ancestor(fk).Order("-PubDate").GetAll(c, &f.Items)
	if err != nil {
		handleError(w, err)
		return
	}
	templ, err := template.New("showFeed").Parse(feedPageRaw)
	if err != nil {
		handleError(w, err)
		return
	}
	err = templ.Execute(w, f)
	if err != nil {
		handleError(w, err)
		return
	}
}

func (sto *appengineStorage) EnumerateBlobs(ctx context.Context, dest chan<- blob.SizedRef, after string, limit int) error {
	defer close(dest)

	loan := ctxPool.Get()
	defer loan.Return()
	actx := loan

	prefix := sto.namespace + "|"
	keyBegin := datastore.NewKey(actx, memKind, prefix+after, 0, nil)
	keyEnd := datastore.NewKey(actx, memKind, sto.namespace+"~", 0, nil)

	q := datastore.NewQuery(memKind).Limit(int(limit)).Filter("__key__>", keyBegin).Filter("__key__<", keyEnd)
	it := q.Run(actx)
	var row memEnt
	for {
		key, err := it.Next(&row)
		if err == datastore.Done {
			break
		}
		if err != nil {
			return err
		}
		select {
		case dest <- blob.SizedRef{blob.ParseOrZero(key.StringID()[len(prefix):]), uint32(row.Size)}:
		case <-ctx.Done():
			return ctx.Err()
		}
	}
	return nil
}

func newGrid(w http.ResponseWriter, r *http.Request) {
	c := appengine.NewContext(r)
	title := r.FormValue("title")
	rows := strings.Split(r.FormValue("rows"), "\n")
	cols := strings.Split(r.FormValue("cols"), "\n")
	key := newKey()
	k := datastore.NewKey(c, "grid", key, 0, nil)
	g := new(Grid)
	g.Id = key
	g.Title = title
	_, err := datastore.Put(c, k, g)
	if err != nil {
		c.Errorf("error adding grid: %v", err)
	}
	for i, r := range rows {
		rkey := datastore.NewKey(c, "row", newKey(), 0, nil)
		row := new(Row)
		row.Grid = k
		row.Label = strings.TrimSpace(r)
		row.DisplayOrder = i
		_, err := datastore.Put(c, rkey, row)
		c.Errorf("added row %v", err)
	}
	for i, co := range cols {
		ckey := datastore.NewKey(c, "col", newKey(), 0, nil)
		col := new(Col)
		col.Grid = k
		col.Label = strings.TrimSpace(co)
		col.DisplayOrder = i
		_, err := datastore.Put(c, ckey, col)
		c.Errorf("added col %v", err)
	}

	http.Redirect(w, r, "/grid/"+key, http.StatusFound)
}

func read(c appengine.Context, name string) (fi *FileInfo, data []byte, err error) {
	name, _, _ = mangle(c, name)
	fi1, err := stat(c, name)
	if err != nil {
		return nil, nil, err
	}
	if fi1.IsDir {
		dt, err := readdir(c, name)
		if err != nil {
			return nil, nil, err
		}
		fi = fi1
		data = dt
		return fi, data, nil
	}

	root := datastore.NewKey(c, "RootKey", "v2:", 0, nil)
	dkey := datastore.NewKey(c, "FileData", "", fi1.Qid, root)
	var fd FileData
	c.Infof("DATASTORE Read %q", name)
	if err := datastore.Get(c, dkey, &fd); err != nil {
		return nil, nil, err
	}
	fi = fi1
	data = fd.Data
	return fi, data, nil
}

func (cfg *Config) Key(c appengine.Context, parent *datastore.Key) *datastore.Key {
	if parent == nil {
		u := user.Current(c)
		parent = datastore.NewKey(c, userTabName, u.String(), 0, nil)
	}
	return datastore.NewKey(c, configTableName, cfg.Name, 0, parent)
}

func (sto *appengineStorage) EnumerateBlobs(dest chan<- blob.SizedRef, after string, limit int, wait time.Duration) error {
	defer close(dest)

	ctx := sto.ctx
	if ctx == nil {
		loan := ctxPool.Get()
		defer loan.Return()
		ctx = loan
	}

	prefix := sto.namespace + "|"
	keyBegin := datastore.NewKey(ctx, memKind, prefix+after, 0, nil)
	keyEnd := datastore.NewKey(ctx, memKind, sto.namespace+"~", 0, nil)

	q := datastore.NewQuery(memKind).Limit(int(limit)).Filter("__key__>", keyBegin).Filter("__key__<", keyEnd)
	it := q.Run(ctx)
	var row memEnt
	for {
		key, err := it.Next(&row)
		if err == datastore.Done {
			break
		}
		if err != nil {
			return err
		}
		dest <- blob.SizedRef{blob.ParseOrZero(key.StringID()[len(prefix):]), row.Size}
	}
	return nil
}

func TouchSuc(c appengine.Context, IdSuc string, IdEmp string) error {
	/* llave de Cta-Empresa */
	ce := &CtaEmpresa{IdEmp: IdEmp}
	ceKey := datastore.NewKey(c, "CtaEmpresa", ce.IdEmp, 0, nil)
	err := datastore.Get(c, ceKey, ce)
	if err == datastore.ErrNoSuchEntity {
		return nil
	}

	/* parent de Empresa */
	cta := &Cta{Email: ce.Email}
	ctaKey := datastore.NewKey(c, "Cta", cta.Email, 0, nil)
	err = datastore.Get(c, ctaKey, cta)
	if err == datastore.ErrNoSuchEntity {
		return nil
	}

	/* Key de empresa */
	empKey := datastore.NewKey(c, "Empresa", IdEmp, 0, ctaKey)

	suc := &Sucursal{IdSuc: IdSuc}
	sucKey := datastore.NewKey(c, "Sucursal", IdSuc, 0, empKey)
	err = datastore.Get(c, sucKey, suc)
	if err == datastore.ErrNoSuchEntity {
		return err
	}
	suc.FechaHora = time.Now().Add(time.Duration(GMTADJ) * time.Second)
	if _, err = datastore.Put(c, sucKey, suc); err != nil {
		return err
	}
	return nil
}

// Increment increments the named counter.
func Increment(c appengine.Context, name string) error {
    // Get counter config.
    var cfg counterConfig
    ckey := datastore.NewKey(c, configKind, name, 0, nil)
    err := datastore.RunInTransaction(c, func(c appengine.Context) error {
        err := datastore.Get(c, ckey, &cfg)
        if err == datastore.ErrNoSuchEntity {
            cfg.Shards = defaultShards
            _, err = datastore.Put(c, ckey, &cfg)
        }
        return err
    }, nil)
    if err != nil {
        return err
    }
    err = datastore.RunInTransaction(c, func(c appengine.Context) error {
        shardName := fmt.Sprintf("%v%d", name, rand.Intn(cfg.Shards))
        key := datastore.NewKey(c, shardKind, shardName, 0, nil)
        var s shard
        err := datastore.Get(c, key, &s)
        // A missing entity and a present entity will both work.
        if err != nil && err != datastore.ErrNoSuchEntity {
            return err
        }
        s.Count++
		s.Name = name
        _, err = datastore.Put(c, key, &s)
        return err
    }, nil)
    if err != nil {
        return err
    }
    //memcache.Increment(c, memcacheKey(name), 1, 0)
    return nil
}

// Métodos de Empresa
func GetEmpresa(c appengine.Context, id string) *Empresa {
	/* llave de Cta-Empresa */
	ce := &CtaEmpresa{IdEmp: id}
	ceKey := datastore.NewKey(c, "CtaEmpresa", ce.IdEmp, 0, nil)
	err := datastore.Get(c, ceKey, ce)
	if err == datastore.ErrNoSuchEntity {
		return nil
	}

	/* parent de Empresa */
	cta := &Cta{Email: ce.Email}
	ctaKey := datastore.NewKey(c, "Cta", cta.Email, 0, nil)
	err = datastore.Get(c, ctaKey, cta)
	if err == datastore.ErrNoSuchEntity {
		return nil
	}

	/* Key de empresa */
	emp := &Empresa{IdEmp: id}
	empKey := datastore.NewKey(c, "Empresa", emp.IdEmp, 0, ctaKey)
	err = datastore.Get(c, empKey, emp)
	if err == datastore.ErrNoSuchEntity {
		return nil
	}
	return emp
}

func GetEmpSucursales(c appengine.Context, IdEmp string) *[]Sucursal {
	/* llave de Cta-Empresa */
	ce := &CtaEmpresa{IdEmp: IdEmp}
	ceKey := datastore.NewKey(c, "CtaEmpresa", ce.IdEmp, 0, nil)
	err := datastore.Get(c, ceKey, ce)
	if err == datastore.ErrNoSuchEntity {
		return nil
	}

	/* parent de Empresa */
	cta := &Cta{Email: ce.Email}
	ctaKey := datastore.NewKey(c, "Cta", cta.Email, 0, nil)
	err = datastore.Get(c, ctaKey, cta)
	if err == datastore.ErrNoSuchEntity {
		return nil
	}

	/* Key de empresa */
	empKey := datastore.NewKey(c, "Empresa", IdEmp, 0, ctaKey)
	q := datastore.NewQuery("Sucursal").Ancestor(empKey)
	n, _ := q.Count(c)
	sucursales := make([]Sucursal, 0, n)
	if _, err := q.GetAll(c, &sucursales); err != nil {
		return nil
	}
	return &sucursales
}

func registration(w http.ResponseWriter, r *http.Request) {
	c := appengine.NewContext(r)

	u := User{
		Name:      "TestHendrik",
		StartDate: datastore.SecondsToTime(time.Seconds()),
	}

	if g := user.Current(c); g != nil {
		var u2 User
		u.Account = g.String()
		if err := datastore.Get(c, datastore.NewKey("user", g.String(), 0, nil), &u2); err == datastore.ErrNoSuchEntity {
			key, err := datastore.Put(c, datastore.NewKey("user", u.Account, 0, nil), &u)
			if err != nil {
				http.Error(w, err.String(), http.StatusInternalServerError)
				return
			}
			fmt.Fprintf(w, "User %q stored %q", u.Account, key)
			return
		} else {
			fmt.Fprintf(w, "User %q  is already logged in", g.String())
			return
		}
	} else {
		url, err := user.LoginURL(c, r.URL.String())
		if err != nil {
			http.Error(w, err.String(), http.StatusInternalServerError)
			return
		}
		w.Header().Set("Location", url)
		w.WriteHeader(http.StatusFound)
		return
	}

}

// chat部屋にいるメンバリストに相当するAncestorKeyを返す
func memberKey(c appengine.Context, key string) *datastore.Key {
	if key == "" {
		return datastore.NewKey(c, "Member", "default_member", 0, nil)
	} else {
		return datastore.NewKey(c, "Member", key, 0, nil)
	}
}

func (this *ArticleMetaData) Delete(ctx Context) (err error) {
	c := ctx.GAEContext
	k := datastore.NewKey(c, "Article", this.Id, 0, nil)
	err = datastore.RunInTransaction(c, func(c appengine.Context) error {
		err = datastore.Get(c, k, this)
		if err != nil {
			return err
		}
		if len(this.Tags) > 0 {
			tags := make([]Tags, len(this.Tags))
			tagsKey := make([]*datastore.Key, len(this.Tags))
			for id, tag := range this.Tags {
				tags[id].ArticleId = this.Id
				tags[id].Tag = tag
				tagId := this.Id + tag
				tagsKey[id] = datastore.NewKey(c, "Tags", tagId, 0, nil)
			}
			err = datastore.DeleteMulti(c, tagsKey)
			if err != nil {
				return err
			}
		}
		err = datastore.Delete(c, k)
		return err
	}, &datastore.TransactionOptions{XG: true})
	return err
}

func (d *DatastoreStorage) StorePosts(req *http.Request, posts []blogplus.Activity) {
	c := appengine.NewContext(req)
	var keys []*datastore.Key
	var src []interface{}
	for _, post := range posts {
		if d.filter != nil && !d.filter(post) {
			c.Debugf("ignore post:%s", post.Id)
			continue
		}
		datespec := blogplus.GetDatespec(post.Published)
		data, err := blogplus.EncodeActivity(post)
		if err != nil {
			c.Errorf("encode error:%#v", err)
			continue
		}
		c.Infof("store %s datespec %s", post.Id, datespec)
		datekey := datastore.NewKey(c, activityRef, post.Id, 0, datastore.NewKey(c, datespecKind, datespec, 0, nil))
		key := datastore.NewKey(c, activityKind, post.Id, 0, nil)
		keys = append(keys, datekey)
		src = append(src, &DatespecEntity{Id: key})
		keys = append(keys, key)
		src = append(src, &ActivityEntity{
			Id:        post.Id,
			Published: post.Published,
			Post:      data})
	}
	_, err := datastore.PutMulti(c, keys, src)
	if err != nil {
		c.Errorf("put error:%#v", err)
	}
}