Simple memory testing for gae/wrapper

go/src/infra/gae/libs/wrapper/memory/datastore_test.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 (
+        "fmt"
+        "testing"
+
+        "golang.org/x/net/context"
+
+        "appengine/datastore"
+
+        . "github.com/smartystreets/goconvey/convey"
+
+        "infra/gae/libs/meta"
+        "infra/gae/libs/wrapper"
+)
+
+func TestDatastoreKinder(t *testing.T) {
+        Convey("Datastore kinds and keys", t, func() {
+                c := Use(Enable(context.Background()))
+                ds := wrapper.GetDS(c)
+                So(ds, ShouldNotBeNil)
+
+                Convey("implements DSKinder", func() {
+                        type Foo struct{}
+                        So(ds.Kind(&Foo{}), ShouldEqual, "Foo")
+
+                        Convey("which can be tweaked by DSKindSetter", func() {
+                                ds.SetKindNameResolver(func(interface{}) string { return "spam" })
+                                So(ds.Kind(&Foo{}), ShouldEqual, "spam")
+
+                                Convey("and it retains the function so you can stack them", func() {
+                                        cur := ds.KindNameResolver()
+                                        ds.SetKindNameResolver(func(o interface{}) string { return "wat" + cur(o) })
+                                        So(ds.Kind(&Foo{}), ShouldEqual, "watspam")
+                                })
+                        })
+                })
+
+                Convey("implements DSNewKeyer", func() {
+                        Convey("NewKey", func() {
+                                key := ds.NewKey("nerd", "stringID", 0, nil)
+                                So(key, ShouldNotBeNil)
+                                So(key.Kind(), ShouldEqual, "nerd")
+                                So(key.StringID(), ShouldEqual, "stringID")
+                                So(key.IntID(), ShouldEqual, 0)
+                                So(key.Parent(), ShouldBeNil)
+                                So(key.AppID(), ShouldEqual, "dev~my~app")
+                                So(key.Namespace(), ShouldEqual, "")
+                                So(key.String(), ShouldEqual, "/nerd,stringID")
+                                So(key.Incomplete(), ShouldBeFalse)
+                                So(KeyValid("", key, UserKeyOnly), ShouldBeTrue)
+
+                                chkey := ds.NewKey("wat", "", 100, key)
+                                So(chkey, ShouldNotBeNil)
+                                So(chkey.Kind(), ShouldEqual, "wat")
+                                So(chkey.StringID(), ShouldEqual, "")
+                                So(chkey.IntID(), ShouldEqual, 100)
+                                So(chkey.Parent(), ShouldEqual, key)
+                                So(chkey.AppID(), ShouldEqual, "dev~my~app")
+                                So(chkey.Namespace(), ShouldEqual, "")
+                                So(chkey.String(), ShouldEqual, "/nerd,stringID/wat,100")
+                                So(key.Incomplete(), ShouldBeFalse)
+                                So(KeyValid("", chkey, UserKeyOnly), ShouldBeTrue)
+
+                                incompl := ds.NewKey("sup", "", 0, key)
+                                So(incompl, ShouldNotBeNil)
+                                So(incompl.Incomplete(), ShouldBeTrue)
+                                So(KeyValid("", incompl, UserKeyOnly), ShouldBeTrue)
+                                So(incompl.String(), ShouldEqual, "/nerd,stringID/sup,0")
+
+                                bad := ds.NewKey("nooo", "", 10, incompl)
+                                So(bad, ShouldNotBeNil)
+                                So(bad.Incomplete(), ShouldBeFalse)
+                                So(KeyValid("", bad, UserKeyOnly), ShouldBeFalse)
+                                So(bad.String(), ShouldEqual, "/nerd,stringID/sup,0/nooo,10")
+
+                                So(rootKey(bad), ShouldEqual, key)
+
+                                Convey("other key validation", func() {
+                                        So(KeyValid("", nil, UserKeyOnly), ShouldBeFalse)
+
+                                        key := ds.NewKey("", "", 0, nil)
+                                        So(key, ShouldNotBeNil)
+
+                                        So(KeyValid("", key, UserKeyOnly), ShouldBeFalse)
+
+                                        key = ds.NewKey("noop", "power level", 9000, nil)
+                                        So(key, ShouldNotBeNil)
+
+                                        So(KeyValid("", key, UserKeyOnly), ShouldBeFalse)
+                                })
+                        })
+
+                        Convey("NewKeyObj", func() {
+                                type Foo struct {
+                                        _knd   string         `goon:"kind,coool"`
+                                        ID     int64          `goon:"id"`
+                                        Parent *datastore.Key `goon:"parent"`
+                                }
+                                f := &Foo{ID: 100}
+                                k := ds.NewKeyObj(f)
+                                So(k.String(), ShouldEqual, "/coool,100")
+
+                                f.Parent = k
+                                f._knd = "weevils"
+                                f.ID = 19
+                                k = ds.NewKeyObj(f)
+                                So(k.String(), ShouldEqual, "/coool,100/weevils,19")
+
+                                Convey("panics when you do a dumb thing", func() {
+                                        type Foo struct {
+                                                ID []byte `goon:"id"`
+                                        }
+                                        So(func() { ds.NewKeyObj(&Foo{}) }, ShouldPanic)
+                                })
+                        })
+
+                        Convey("NewKeyObjError", func() {
+                                type Foo struct {
+                                        ID []byte `goon:"id"`
+                                }
+                                _, err := ds.NewKeyObjError(&Foo{})
+                                So(err.Error(), ShouldContainSubstring, "must be int64 or string")
+                        })
+                })
+
+        })
+}
+
+func TestDatastoreSingleReadWriter(t *testing.T) {
+        Convey("Datastore single reads and writes", t, func() {
+                c := Use(Enable(context.Background()))
+                ds := wrapper.GetDS(c)
+                So(ds, ShouldNotBeNil)
+
+                Convey("implements DSSingleReadWriter", func() {
+                        type Foo struct {
+                                ID     int64          `goon:"id" datastore:"-"`
+                                Parent *datastore.Key `goon:"parent" datastore:"-"`
+                                Val    int
+                        }
+
+                        Convey("invalid keys break", func() {
+                                k := ds.NewKeyObj(&Foo{})
+                                f := &Foo{Parent: k}
+                                So(ds.Get(f), ShouldEqual, datastore.ErrInvalidKey)
+
+                                _, err := ds.Put(f)
+                                So(err, ShouldEqual, datastore.ErrInvalidKey)
+                        })
+
+                        Convey("getting objects that DNE is an error", func() {
+                                So(ds.Get(&Foo{ID: 1}), ShouldEqual, datastore.ErrNoSuchEntity)
+                        })
+
+                        Convey("Can Put stuff", func() {
+                                // with an incomplete key!
+                                f := &Foo{Val: 10}
+                                k, err := ds.Put(f)
+                                So(err, ShouldBeNil)
+                                So(k.String(), ShouldEqual, "/Foo,1")
+                                So(ds.NewKeyObj(f), ShouldResemble, k)
+
+                                Convey("and Get it back", func() {
+                                        newFoo := &Foo{ID: 1}
+                                        err := ds.Get(newFoo)
+                                        So(err, ShouldBeNil)
+                                        So(newFoo, ShouldResemble, f)
+
+                                        Convey("and we can Delete it", func() {
+                                                err := ds.Delete(ds.NewKey("Foo", "", 1, nil))
+                                                So(err, ShouldBeNil)
+
+                                                err = ds.Get(newFoo)
+                                                So(err, ShouldEqual, datastore.ErrNoSuchEntity)
+                                        })
+                                })
+                                Convey("Deleteing with a bogus key is bad", func() {
+                                        err := ds.Delete(ds.NewKey("Foo", "wat", 100, nil))
+                                        So(err, ShouldEqual, datastore.ErrInvalidKey)
+                                })
+                                Convey("Deleteing a DNE entity is fine", func() {
+                                        err := ds.Delete(ds.NewKey("Foo", "wat", 0, nil))
+                                        So(err, ShouldBeNil)
+                                })
+
+                                Convey("serialization breaks in the normal ways", func() {
+                                        type BadFoo struct {
+                                                _kind string `goon:"kind,Foo"`
+                                                ID    int64  `goon:"id" datastore:"-"`
+                                                Val   uint8
+                                        }
+                                        _, err := ds.Put(&BadFoo{})
+                                        So(err.Error(), ShouldContainSubstring,
+                                                "unsupported struct field type: uint8")
+
+                                        err = ds.Get(&BadFoo{ID: 1})
+                                        So(err.Error(), ShouldContainSubstring,
+                                                "type mismatch: int versus uint8")
+                                })
+
+                                Convey("check that metadata works", func() {
+                                        val, _ := meta.GetEntityGroupVersion(c, k)
+                                        So(val, ShouldEqual, 1)
+
+                                        for i := 0; i < 10; i++ {
+                                                _, err = ds.Put(&Foo{Val: 10, Parent: k})
+                                                So(err, ShouldBeNil)
+                                        }
+                                        val, _ = meta.GetEntityGroupVersion(c, k)
+                                        So(val, ShouldEqual, 11)
+
+                                        Convey("ensure that group versions persist across deletes", func() {
+                                                So(ds.Delete(k), ShouldBeNil)
+                                                for i := int64(1); i < 11; i++ {
+                                                        So(ds.Delete(ds.NewKey("Foo", "", i, k)), ShouldBeNil)
+                                                }
+                                                // TODO(riannucci): replace with a Count query instead of this cast
+                                                ents := ds.(*dsImpl).data.store.GetCollection("ents:")
+                                                num, _ := ents.GetTotals()
+                                                // /__entity_root_ids__,Foo
+                                                // /Foo,1/__entity_group__,1
+                                                // /Foo,1/__entity_group_ids__,1
+                                                So(num, ShouldEqual, 3)
+
+                                                version, err := curval(ents, groupMetaKey(k))
+                                                So(err, ShouldBeNil)
+                                                So(version, ShouldEqual, 22)
+
+                                                k, err := ds.Put(f)
+                                                So(err, ShouldBeNil)
+                                                val, _ := meta.GetEntityGroupVersion(c, k)
+                                                So(val, ShouldEqual, 23)
+                                        })
+                                })
+                        })
+                })
+
+                Convey("implements DSTransactioner", func() {
+                        type Foo struct {
+                                ID     int64          `goon:"id" datastore:"-"`
+                                Parent *datastore.Key `goon:"parent" datastore:"-"`
+                                Val    int
+                        }
+                        Convey("Put", func() {
+                                f := &Foo{Val: 10}
+                                k, err := ds.Put(f)
+                                So(err, ShouldBeNil)
+                                So(k.String(), ShouldEqual, "/Foo,1")
+                                So(ds.NewKeyObj(f), ShouldResemble, k)
+
+                                Convey("can Put new entity groups", func() {
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                ds := wrapper.GetDS(c)
+                                                So(ds, ShouldNotBeNil)
+
+                                                f1 := &Foo{Val: 100}
+                                                k, err := ds.Put(f1)
+                                                So(err, ShouldBeNil)
+                                                So(k.String(), ShouldEqual, "/Foo,2")
+
+                                                f2 := &Foo{Val: 200}
+                                                k, err = ds.Put(f2)
+                                                So(err, ShouldBeNil)
+                                                So(k.String(), ShouldEqual, "/Foo,3")
+
+                                                return nil
+                                        }, &datastore.TransactionOptions{XG: true})
+                                        So(err, ShouldBeNil)
+
+                                        f := &Foo{ID: 2}
+                                        So(ds.Get(f), ShouldBeNil)
+                                        So(f.Val, ShouldEqual, 100)
+
+                                        f = &Foo{ID: 3}
+                                        So(ds.Get(f), ShouldBeNil)
+                                        So(f.Val, ShouldEqual, 200)
+                                })
+
+                                Convey("can Put new entities in a current group", func() {
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                ds := wrapper.GetDS(c)
+                                                So(ds, ShouldNotBeNil)
+
+                                                f1 := &Foo{Val: 100, Parent: ds.NewKeyObj(f)}
+                                                k, err := ds.Put(f1)
+                                                So(err, ShouldBeNil)
+                                                So(k.String(), ShouldEqual, "/Foo,1/Foo,1")
+
+                                                f2 := &Foo{Val: 200, Parent: ds.NewKeyObj(f)}
+                                                k, err = ds.Put(f2)
+                                                So(err, ShouldBeNil)
+                                                So(k.String(), ShouldEqual, "/Foo,1/Foo,2")
+
+                                                return nil
+                                        }, nil)
+                                        So(err, ShouldBeNil)
+
+                                        f1 := &Foo{ID: 1, Parent: ds.NewKeyObj(&Foo{ID: 1})}
+                                        So(ds.Get(f1), ShouldBeNil)
+                                        So(f1.Val, ShouldEqual, 100)
+
+                                        f2 := &Foo{ID: 2, Parent: f1.Parent}
+                                        So(ds.Get(f2), ShouldBeNil)
+                                        So(f2.Val, ShouldEqual, 200)
+                                })
+
+                                Convey("Deletes work too", func() {
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                ds := wrapper.GetDS(c)
+                                                So(ds, ShouldNotBeNil)
+                                                So(ds.Delete(ds.NewKeyObj(f)), ShouldBeNil)
+                                                return nil
+                                        }, nil)
+                                        So(err, ShouldBeNil)
+                                        So(ds.Get(f), ShouldEqual, datastore.ErrNoSuchEntity)
+                                })
+
+                                Convey("A Get counts against your group count", func() {
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                ds := wrapper.GetDS(c)
+                                                f := &Foo{ID: 20}
+                                                So(ds.Get(f), ShouldEqual, datastore.ErrNoSuchEntity)
+
+                                                f.ID = 1
+                                                So(ds.Get(f).Error(), ShouldContainSubstring, "cross-group")
+                                                return nil
+                                        }, nil)
+                                        So(err, ShouldBeNil)
+                                })
+
+                                Convey("Get takes a snapshot", func() {
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                txnDS := wrapper.GetDS(c)
+                                                So(txnDS, ShouldNotBeNil)
+
+                                                f := &Foo{ID: 1}
+                                                So(txnDS.Get(f), ShouldBeNil)
+                                                So(f.Val, ShouldEqual, 10)
+
+                                                // Don't ever do this in a real program unless you want to guarantee
+                                                // a failed transaction :)
+                                                f.Val = 11
+                                                _, err := ds.Put(f)
+                                                So(err, ShouldBeNil)
+
+                                                So(txnDS.Get(f), ShouldBeNil)
+                                                So(f.Val, ShouldEqual, 10)
+
+                                                return nil
+                                        }, nil)
+                                        So(err, ShouldBeNil)
+
+                                        f := &Foo{ID: 1}
+                                        So(ds.Get(f), ShouldBeNil)
+                                        So(f.Val, ShouldEqual, 11)
+
+                                })
+
+                                Convey("and snapshots are consistent even after Puts", func() {
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                txnDS := wrapper.GetDS(c)
+                                                So(txnDS, ShouldNotBeNil)
+
+                                                f := &Foo{ID: 1}
+                                                So(txnDS.Get(f), ShouldBeNil)
+                                                So(f.Val, ShouldEqual, 10)
+
+                                                // Don't ever do this in a real program unless you want to guarantee
+                                                // a failed transaction :)
+                                                f.Val = 11
+                                                _, err := ds.Put(f)
+                                                So(err, ShouldBeNil)
+
+                                                So(txnDS.Get(f), ShouldBeNil)
+                                                So(f.Val, ShouldEqual, 10)
+
+                                                f.Val = 20
+                                                _, err = txnDS.Put(f)
+                                                So(err, ShouldBeNil)
+
+                                                So(txnDS.Get(f), ShouldBeNil)
+                                                So(f.Val, ShouldEqual, 10) // still gets 10
+
+                                                return nil
+                                        }, nil)
+                                        So(err.Error(), ShouldContainSubstring, "concurrent")
+
+                                        f := &Foo{ID: 1}
+                                        So(ds.Get(f), ShouldBeNil)
+                                        So(f.Val, ShouldEqual, 11)
+                                })
+
+                                Convey("Reusing a transaction context is bad news", func() {
+                                        var txnDS wrapper.Datastore
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                txnDS = wrapper.GetDS(c)
+                                                So(txnDS.Get(&Foo{ID: 1}), ShouldBeNil)
+                                                return nil
+                                        }, nil)
+                                        So(err, ShouldBeNil)
+                                        So(txnDS.Get(&Foo{ID: 1}).Error(), ShouldContainSubstring, "expired")
+                                })
+
+                                Convey("Nested transactions are rejected", func() {
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                err := wrapper.GetDS(c).RunInTransaction(func(c context.Context) error {
+                                                        panic("noooo")
+                                                }, nil)
+                                                So(err.Error(), ShouldContainSubstring, "nested transactions")
+                                                return nil
+                                        }, nil)
+                                        So(err, ShouldBeNil)
+                                })
+
+                                Convey("Concurrent transactions only accept one set of changes", func() {
+                                        // Note: I think this implementation is actually /slightly/ wrong.
+                                        // Accorting to my read of the docs for appengine, when you open a
+                                        // transaction it actually (essentially) holds a reference to the
+                                        // entire datastore. Our implementation takes a snapshot of the
+                                        // entity group as soon as something observes/affects it.
+                                        //
+                                        // That said... I'm not sure if there's really a semantic difference.
+                                        err := ds.RunInTransaction(func(c context.Context) error {
+                                                txnDS := wrapper.GetDS(c)
+                                                f := &Foo{ID: 1, Val: 21}
+                                                _, err = txnDS.Put(f)
+                                                So(err, ShouldBeNil)
+
+                                                err := ds.RunInTransaction(func(c context.Context) error {
+                                                        txnDS := wrapper.GetDS(c)
+                                                        f := &Foo{ID: 1, Val: 27}
+                                                        _, err := txnDS.Put(f)
+                                                        So(err, ShouldBeNil)
+                                                        return nil
+                                                }, nil)
+                                                So(err, ShouldBeNil)
+
+                                                return nil
+                                        }, nil)
+                                        So(err.Error(), ShouldContainSubstring, "concurrent")
+
+                                        f := &Foo{ID: 1}
+                                        So(ds.Get(f), ShouldBeNil)
+                                        So(f.Val, ShouldEqual, 27)
+                                })
+
+                                Convey("XG", func() {
+                                        Convey("Modifying two groups with XG=false is invalid", func() {
+                                                err := ds.RunInTransaction(func(c context.Context) error {
+                                                        ds := wrapper.GetDS(c)
+                                                        f := &Foo{ID: 1, Val: 200}
+                                                        _, err := ds.Put(f)
+                                                        So(err, ShouldBeNil)
+
+                                                        f.ID = 2
+                                                        _, err = ds.Put(f)
+                                                        So(err.Error(), ShouldContainSubstring, "cross-group")
+                                                        return err
+                                                }, nil)
+                                                So(err.Error(), ShouldContainSubstring, "cross-group")
+                                        })
+
+                                        Convey("Modifying >25 groups with XG=true is invald", func() {
+                                                err := ds.RunInTransaction(func(c context.Context) error {
+                                                        ds := wrapper.GetDS(c)
+                                                        for i := int64(1); i < 26; i++ {
+                                                                f := &Foo{ID: i, Val: 200}
+                                                                _, err := ds.Put(f)
+                                                                So(err, ShouldBeNil)
+                                                        }
+                                                        f := &Foo{ID: 27, Val: 200}
+                                                        _, err := ds.Put(f)
+                                                        So(err.Error(), ShouldContainSubstring, "too many entity groups")
+                                                        return err
+                                                }, &datastore.TransactionOptions{XG: true})
+                                                So(err.Error(), ShouldContainSubstring, "too many entity groups")
+                                        })
+                                })
+
+                                Convey("Errors and panics", func() {
+                                        Convey("returning an error aborts", func() {
+                                                err := ds.RunInTransaction(func(c context.Context) error {
+                                                        ds := wrapper.GetDS(c)
+                                                        f := &Foo{ID: 1, Val: 200}
+                                                        _, err := ds.Put(f)
+                                                        So(err, ShouldBeNil)
+
+                                                        return fmt.Errorf("thingy")
+                                                }, nil)
+                                                So(err.Error(), ShouldEqual, "thingy")
+
+                                                f := &Foo{ID: 1}
+                                                So(ds.Get(f), ShouldBeNil)
+                                                So(f.Val, ShouldEqual, 10)
+                                        })
+
+                                        Convey("panicing aborts", func() {
+                                                So(func() {
+                                                        ds.RunInTransaction(func(c context.Context) error {
+                                                                ds := wrapper.GetDS(c)
+                                                                f := &Foo{ID: 1, Val: 200}
+                                                                _, err := ds.Put(f)
+                                                                So(err, ShouldBeNil)
+                                                                panic("wheeeeee")
+                                                        }, nil)
+                                                }, ShouldPanic)
+
+                                                f := &Foo{ID: 1}
+                                                So(ds.Get(f), ShouldBeNil)
+                                                So(f.Val, ShouldEqual, 10)
+                                        })
+                                })
+                        })
+                })
+
+        })
+}