Revert "Refactor current GAE abstraction library to be free of the SDK*"

go/src/infra/gae/libs/wrapper/memory/datastore.go

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package memory
+
+import (
+        "errors"
+        "fmt"
+        "infra/gae/libs/wrapper"
+        "strings"
+
+        "github.com/mjibson/goon"
+        "golang.org/x/net/context"
+
+        "appengine/datastore"
+        "appengine_internal"
+        pb "appengine_internal/datastore"
+)
+
+//////////////////////////////////// public ////////////////////////////////////
+
+// useDS adds a wrapper.Datastore implementation to context, accessible
+// by wrapper.GetDS(c)
+func useDS(c context.Context) context.Context {
+        return wrapper.SetDSFactory(c, func(ic context.Context) wrapper.Datastore {
+                dsd := cur(ic).Get(memContextDSIdx)
+
+                switch x := dsd.(type) {
+                case *dataStoreData:
+                        return &dsImpl{wrapper.DummyDS(), x, curGID(ic).namespace, ic}
+                case *txnDataStoreData:
+                        return &txnDsImpl{wrapper.DummyDS(), x, curGID(ic).namespace}
+                default:
+                        panic(fmt.Errorf("DS: bad type: %v in context %v", dsd, ic))
+                }
+        })
+}
+
+//////////////////////////////////// dsImpl ////////////////////////////////////
+
+// dsImpl exists solely to bind the current c to the datastore data.
+type dsImpl struct {
+        wrapper.Datastore
+
+        data *dataStoreData
+        ns   string
+        c    context.Context
+}
+
+var (
+        _ = wrapper.Datastore((*dsImpl)(nil))
+        _ = wrapper.Testable((*dsImpl)(nil))
+)
+
+func (d *dsImpl) BreakFeatures(err error, features ...string) {
+        d.data.BreakFeatures(err, features...)
+}
+func (d *dsImpl) UnbreakFeatures(features ...string) {
+        d.data.UnbreakFeatures(features...)
+}
+
+func (d *dsImpl) Kind(src interface{}) string {
+        return kind(d.ns, d.KindNameResolver(), src)
+}
+
+func (d *dsImpl) KindNameResolver() goon.KindNameResolver {
+        return d.data.KindNameResolver()
+}
+func (d *dsImpl) SetKindNameResolver(knr goon.KindNameResolver) {
+        d.data.SetKindNameResolver(knr)
+}
+
+func (d *dsImpl) NewKey(kind, stringID string, intID int64, parent *datastore.Key) *datastore.Key {
+        return newKey(d.ns, kind, stringID, intID, parent)
+}
+func (d *dsImpl) NewKeyObj(src interface{}) *datastore.Key {
+        return newKeyObj(d.ns, d.KindNameResolver(), src)
+}
+func (d *dsImpl) NewKeyObjError(src interface{}) (*datastore.Key, error) {
+        return newKeyObjError(d.ns, d.KindNameResolver(), src)
+}
+
+func (d *dsImpl) Put(src interface{}) (*datastore.Key, error) {
+        if err := d.data.IsBroken(); err != nil {
+                return nil, err
+        }
+        return d.data.put(d.ns, src)
+}
+
+func (d *dsImpl) Get(dst interface{}) error {
+        if err := d.data.IsBroken(); err != nil {
+                return err
+        }
+        return d.data.get(d.ns, dst)
+}
+
+func (d *dsImpl) Delete(key *datastore.Key) error {
+        if err := d.data.IsBroken(); err != nil {
+                return err
+        }
+        return d.data.del(d.ns, key)
+}
+
+////////////////////////////////// txnDsImpl ///////////////////////////////////
+
+type txnDsImpl struct {
+        wrapper.Datastore
+
+        data *txnDataStoreData
+        ns   string
+}
+
+var (
+        _ = wrapper.Datastore((*txnDsImpl)(nil))
+        _ = wrapper.Testable((*txnDsImpl)(nil))
+)
+
+func (d *dsImpl) NewQuery(kind string) wrapper.DSQuery {
+        return &queryImpl{DSQuery: wrapper.DummyQY(), ns: d.ns, kind: kind}
+}
+
+func (d *dsImpl) Run(q wrapper.DSQuery) wrapper.DSIterator {
+        rq := q.(*queryImpl)
+        rq = rq.normalize().checkCorrectness(d.ns, false)
+        return &queryIterImpl{rq}
+}
+
+func (d *dsImpl) GetAll(q wrapper.DSQuery, dst interface{}) ([]*datastore.Key, error) {
+        // TODO(riannucci): assert that dst is a slice of structs
+        return nil, nil
+}
+
+func (d *dsImpl) Count(q wrapper.DSQuery) (ret int, err error) {
+        itr := d.Run(q.KeysOnly())
+        for _, err = itr.Next(nil); err != nil; _, err = itr.Next(nil) {
+                ret++
+        }
+        if err == datastore.Done {
+                err = nil
+        }
+        return
+}
+
+func (d *txnDsImpl) BreakFeatures(err error, features ...string) {
+        d.data.BreakFeatures(err, features...)
+}
+func (d *txnDsImpl) UnbreakFeatures(features ...string) {
+        d.data.UnbreakFeatures(features...)
+}
+
+func (d *txnDsImpl) Kind(src interface{}) string {
+        return kind(d.ns, d.KindNameResolver(), src)
+}
+
+func (d *txnDsImpl) KindNameResolver() goon.KindNameResolver {
+        return d.data.KindNameResolver()
+}
+func (d *txnDsImpl) SetKindNameResolver(knr goon.KindNameResolver) {
+        d.data.SetKindNameResolver(knr)
+}
+
+func (d *txnDsImpl) NewKey(kind, stringID string, intID int64, parent *datastore.Key) *datastore.Key {
+        return newKey(d.ns, kind, stringID, intID, parent)
+}
+func (d *txnDsImpl) NewKeyObj(src interface{}) *datastore.Key {
+        return newKeyObj(d.ns, d.KindNameResolver(), src)
+}
+func (d *txnDsImpl) NewKeyObjError(src interface{}) (*datastore.Key, error) {
+        return newKeyObjError(d.ns, d.KindNameResolver(), src)
+}
+
+func (d *txnDsImpl) Put(src interface{}) (*datastore.Key, error) {
+        if err := d.data.IsBroken(); err != nil {
+                return nil, err
+        }
+        return d.data.put(d.ns, src)
+}
+
+func (d *txnDsImpl) Get(dst interface{}) error {
+        if err := d.data.IsBroken(); err != nil {
+                return err
+        }
+        return d.data.get(d.ns, dst)
+}
+
+func (d *txnDsImpl) Delete(key *datastore.Key) error {
+        if err := d.data.IsBroken(); err != nil {
+                return err
+        }
+        return d.data.del(d.ns, key)
+}
+
+func (*txnDsImpl) RunInTransaction(func(c context.Context) error, *datastore.TransactionOptions) error {
+        return errors.New("datastore: nested transactions are not supported")
+}
+
+////////////////////////////// private functions ///////////////////////////////
+
+func newDSError(code pb.Error_ErrorCode, message ...string) *appengine_internal.APIError {
+        return &appengine_internal.APIError{
+                Detail:  strings.Join(message, ""),
+                Service: "datastore_v3",
+                Code:    int32(code),
+        }
+}