78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
// Copyright 2016 Google Inc. All rights reserved.
|
|
// Use of this source code is governed by the Apache 2.0
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package datastore
|
|
|
|
import "golang.org/x/net/context"
|
|
|
|
// Datastore kinds for the metadata entities.
|
|
const (
|
|
namespaceKind = "__namespace__"
|
|
kindKind = "__kind__"
|
|
propertyKind = "__property__"
|
|
)
|
|
|
|
// Namespaces returns all the datastore namespaces.
|
|
func Namespaces(ctx context.Context) ([]string, error) {
|
|
// TODO(djd): Support range queries.
|
|
q := NewQuery(namespaceKind).KeysOnly()
|
|
keys, err := q.GetAll(ctx, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// The empty namespace key uses a numeric ID (==1), but luckily
|
|
// the string ID defaults to "" for numeric IDs anyway.
|
|
return keyNames(keys), nil
|
|
}
|
|
|
|
// Kinds returns the names of all the kinds in the current namespace.
|
|
func Kinds(ctx context.Context) ([]string, error) {
|
|
// TODO(djd): Support range queries.
|
|
q := NewQuery(kindKind).KeysOnly()
|
|
keys, err := q.GetAll(ctx, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return keyNames(keys), nil
|
|
}
|
|
|
|
// keyNames returns a slice of the provided keys' names (string IDs).
|
|
func keyNames(keys []*Key) []string {
|
|
n := make([]string, 0, len(keys))
|
|
for _, k := range keys {
|
|
n = append(n, k.StringID())
|
|
}
|
|
return n
|
|
}
|
|
|
|
// KindProperties returns all the indexed properties for the given kind.
|
|
// The properties are returned as a map of property names to a slice of the
|
|
// representation types. The representation types for the supported Go property
|
|
// types are:
|
|
// "INT64": signed integers and time.Time
|
|
// "DOUBLE": float32 and float64
|
|
// "BOOLEAN": bool
|
|
// "STRING": string, []byte and ByteString
|
|
// "POINT": appengine.GeoPoint
|
|
// "REFERENCE": *Key
|
|
// "USER": (not used in the Go runtime)
|
|
func KindProperties(ctx context.Context, kind string) (map[string][]string, error) {
|
|
// TODO(djd): Support range queries.
|
|
kindKey := NewKey(ctx, kindKind, kind, 0, nil)
|
|
q := NewQuery(propertyKind).Ancestor(kindKey)
|
|
|
|
propMap := map[string][]string{}
|
|
props := []struct {
|
|
Repr []string `datastore:"property_representation"`
|
|
}{}
|
|
|
|
keys, err := q.GetAll(ctx, &props)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for i, p := range props {
|
|
propMap[keys[i].StringID()] = p.Repr
|
|
}
|
|
return propMap, nil
|
|
}
|