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db_firestore.go
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db_firestore.go
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// Copyright 2019 Google LLC
//
// 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
//
// https://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 main
import (
"context"
"fmt"
"log"
"cloud.google.com/go/firestore"
"google.golang.org/api/iterator"
)
// firestoreDB persists books to Cloud Firestore.
// See https://cloud.google.com/firestore/docs.
type firestoreDB struct {
client *firestore.Client
collection string
}
// Ensure firestoreDB conforms to the BookDatabase interface.
var _ BookDatabase = &firestoreDB{}
// [START getting_started_bookshelf_firestore]
// newFirestoreDB creates a new BookDatabase backed by Cloud Firestore.
// See the firestore package for details on creating a suitable
// firestore.Client: https://godoc.org/cloud.google.com/go/firestore.
func newFirestoreDB(client *firestore.Client) (*firestoreDB, error) {
ctx := context.Background()
// Verify that we can communicate and authenticate with the Firestore
// service.
err := client.RunTransaction(ctx, func(ctx context.Context, t *firestore.Transaction) error {
return nil
})
if err != nil {
return nil, fmt.Errorf("firestoredb: could not connect: %w", err)
}
return &firestoreDB{
client: client,
collection: "books",
}, nil
}
// Close closes the database.
func (db *firestoreDB) Close(context.Context) error {
return db.client.Close()
}
// Book retrieves a book by its ID.
func (db *firestoreDB) GetBook(ctx context.Context, id string) (*Book, error) {
ds, err := db.client.Collection(db.collection).Doc(id).Get(ctx)
if err != nil {
return nil, fmt.Errorf("firestoredb: Get: %w", err)
}
b := &Book{}
ds.DataTo(b)
return b, nil
}
// [END getting_started_bookshelf_firestore]
// AddBook saves a given book, assigning it a new ID.
func (db *firestoreDB) AddBook(ctx context.Context, b *Book) (id string, err error) {
ref := db.client.Collection(db.collection).NewDoc()
b.ID = ref.ID
if _, err := ref.Create(ctx, b); err != nil {
return "", fmt.Errorf("Create: %w", err)
}
return ref.ID, nil
}
// DeleteBook removes a given book by its ID.
func (db *firestoreDB) DeleteBook(ctx context.Context, id string) error {
if _, err := db.client.Collection(db.collection).Doc(id).Delete(ctx); err != nil {
return fmt.Errorf("firestore: Delete: %w", err)
}
return nil
}
// UpdateBook updates the entry for a given book.
func (db *firestoreDB) UpdateBook(ctx context.Context, b *Book) error {
if _, err := db.client.Collection(db.collection).Doc(b.ID).Set(ctx, b); err != nil {
return fmt.Errorf("firestsore: Set: %w", err)
}
return nil
}
// ListBooks returns a list of books, ordered by title.
func (db *firestoreDB) ListBooks(ctx context.Context) ([]*Book, error) {
books := make([]*Book, 0)
iter := db.client.Collection(db.collection).Query.OrderBy("Title", firestore.Asc).Documents(ctx)
defer iter.Stop()
for {
doc, err := iter.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, fmt.Errorf("firestoredb: could not list books: %w", err)
}
b := &Book{}
doc.DataTo(b)
log.Printf("Book %q ID: %q", b.Title, b.ID)
books = append(books, b)
}
return books, nil
}