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