83 lines
2.6 KiB
Go
83 lines
2.6 KiB
Go
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// Copyright 2017 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 firestore
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import (
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"errors"
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pb "google.golang.org/genproto/googleapis/firestore/v1beta1"
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"golang.org/x/net/context"
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)
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// A WriteBatch holds multiple database updates. Build a batch with the Create, Set,
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// Update and Delete methods, then run it with the Commit method. Errors in Create,
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// Set, Update or Delete are recorded instead of being returned immediately. The
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// first such error is returned by Commit.
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type WriteBatch struct {
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c *Client
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err error
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writes []*pb.Write
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}
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func (b *WriteBatch) add(ws []*pb.Write, err error) *WriteBatch {
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if b.err != nil {
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return b
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}
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if err != nil {
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b.err = err
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return b
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}
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b.writes = append(b.writes, ws...)
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return b
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}
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// Create adds a Create operation to the batch.
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// See DocumentRef.Create for details.
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func (b *WriteBatch) Create(dr *DocumentRef, data interface{}) *WriteBatch {
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return b.add(dr.newCreateWrites(data))
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}
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// Set adds a Set operation to the batch.
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// See DocumentRef.Set for details.
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func (b *WriteBatch) Set(dr *DocumentRef, data interface{}, opts ...SetOption) *WriteBatch {
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return b.add(dr.newSetWrites(data, opts))
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}
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// Delete adds a Delete operation to the batch.
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// See DocumentRef.Delete for details.
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func (b *WriteBatch) Delete(dr *DocumentRef, opts ...Precondition) *WriteBatch {
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return b.add(dr.newDeleteWrites(opts))
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}
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// Update adds an Update operation to the batch.
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// See DocumentRef.Update for details.
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func (b *WriteBatch) Update(dr *DocumentRef, data []Update, opts ...Precondition) *WriteBatch {
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return b.add(dr.newUpdatePathWrites(data, opts))
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}
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// Commit applies all the writes in the batch to the database atomically. Commit
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// returns an error if there are no writes in the batch, if any errors occurred in
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// constructing the writes, or if the Commmit operation fails.
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func (b *WriteBatch) Commit(ctx context.Context) ([]*WriteResult, error) {
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if b.err != nil {
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return nil, b.err
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}
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if len(b.writes) == 0 {
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return nil, errors.New("firestore: cannot commit empty WriteBatch")
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}
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return b.c.commit(ctx, b.writes)
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}
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