130 lines
3.4 KiB
Go
130 lines
3.4 KiB
Go
// Copyright 2018 Google Inc. All Rights Reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package datastore
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
pb "google.golang.org/genproto/googleapis/datastore/v1"
|
|
)
|
|
|
|
// A Mutation represents a change to a Datastore entity.
|
|
type Mutation struct {
|
|
key *Key // needed for transaction PendingKeys and to dedup deletions
|
|
mut *pb.Mutation
|
|
err error
|
|
}
|
|
|
|
func (m *Mutation) isDelete() bool {
|
|
_, ok := m.mut.Operation.(*pb.Mutation_Delete)
|
|
return ok
|
|
}
|
|
|
|
// NewInsert creates a mutation that will save the entity src into the datastore with
|
|
// key k, returning an error if k already exists.
|
|
// See Client.Put for valid values of src.
|
|
func NewInsert(k *Key, src interface{}) *Mutation {
|
|
if !k.valid() {
|
|
return &Mutation{err: ErrInvalidKey}
|
|
}
|
|
p, err := saveEntity(k, src)
|
|
if err != nil {
|
|
return &Mutation{err: err}
|
|
}
|
|
return &Mutation{
|
|
key: k,
|
|
mut: &pb.Mutation{Operation: &pb.Mutation_Insert{Insert: p}},
|
|
}
|
|
}
|
|
|
|
// NewUpsert creates a mutation that saves the entity src into the datastore with key
|
|
// k, whether or not k exists. See Client.Put for valid values of src.
|
|
func NewUpsert(k *Key, src interface{}) *Mutation {
|
|
if !k.valid() {
|
|
return &Mutation{err: ErrInvalidKey}
|
|
}
|
|
p, err := saveEntity(k, src)
|
|
if err != nil {
|
|
return &Mutation{err: err}
|
|
}
|
|
return &Mutation{
|
|
key: k,
|
|
mut: &pb.Mutation{Operation: &pb.Mutation_Upsert{Upsert: p}},
|
|
}
|
|
}
|
|
|
|
// NewUpdate creates a mutation that replaces the entity in the datastore with key k,
|
|
// returning an error if k does not exist. See Client.Put for valid values of src.
|
|
func NewUpdate(k *Key, src interface{}) *Mutation {
|
|
if !k.valid() {
|
|
return &Mutation{err: ErrInvalidKey}
|
|
}
|
|
if k.Incomplete() {
|
|
return &Mutation{err: fmt.Errorf("datastore: can't update the incomplete key: %v", k)}
|
|
}
|
|
p, err := saveEntity(k, src)
|
|
if err != nil {
|
|
return &Mutation{err: err}
|
|
}
|
|
return &Mutation{
|
|
key: k,
|
|
mut: &pb.Mutation{Operation: &pb.Mutation_Update{Update: p}},
|
|
}
|
|
}
|
|
|
|
// NewDelete creates a mutation that deletes the entity with key k.
|
|
func NewDelete(k *Key) *Mutation {
|
|
if !k.valid() {
|
|
return &Mutation{err: ErrInvalidKey}
|
|
}
|
|
if k.Incomplete() {
|
|
return &Mutation{err: fmt.Errorf("datastore: can't delete the incomplete key: %v", k)}
|
|
}
|
|
return &Mutation{
|
|
key: k,
|
|
mut: &pb.Mutation{Operation: &pb.Mutation_Delete{Delete: keyToProto(k)}},
|
|
}
|
|
}
|
|
|
|
func mutationProtos(muts []*Mutation) ([]*pb.Mutation, error) {
|
|
// If any of the mutations have errors, collect and return them.
|
|
var merr MultiError
|
|
for i, m := range muts {
|
|
if m.err != nil {
|
|
if merr == nil {
|
|
merr = make(MultiError, len(muts))
|
|
}
|
|
merr[i] = m.err
|
|
}
|
|
}
|
|
if merr != nil {
|
|
return nil, merr
|
|
}
|
|
var protos []*pb.Mutation
|
|
// Collect protos. Remove duplicate deletions (see deleteMutations).
|
|
seen := map[string]bool{}
|
|
for _, m := range muts {
|
|
if m.isDelete() {
|
|
ks := m.key.String()
|
|
if seen[ks] {
|
|
continue
|
|
}
|
|
seen[ks] = true
|
|
}
|
|
protos = append(protos, m.mut)
|
|
}
|
|
return protos, nil
|
|
}
|