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recorder.go
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recorder.go
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package recorder
import (
"context"
"fmt"
"log"
"time"
"cloud.google.com/go/bigquery"
"cloud.google.com/go/civil"
"github.com/tatamiya/new-books-notification/src/models"
"google.golang.org/api/iterator"
)
var bqSchema = bigquery.Schema{
{Name: "ISBN", Required: true, Type: bigquery.StringFieldType},
{Name: "PubDate", Required: true, Type: bigquery.DateFieldType},
{Name: "Title", Required: true, Type: bigquery.StringFieldType},
{Name: "Url", Required: true, Type: bigquery.StringFieldType},
{Name: "Authors", Required: false, Type: bigquery.StringFieldType},
{Name: "Publisher", Required: false, Type: bigquery.StringFieldType},
{Name: "Categories", Required: false, Type: bigquery.StringFieldType},
{Name: "Ccode", Required: false, Type: bigquery.StringFieldType},
{Name: "Target", Required: false, Type: bigquery.StringFieldType},
{Name: "Format", Required: false, Type: bigquery.StringFieldType},
{Name: "Content", Required: false, Type: bigquery.StringFieldType},
{Name: "CreatedAt", Required: false, Type: bigquery.TimestampFieldType},
{Name: "LastUpdatedAt", Required: false, Type: bigquery.TimestampFieldType},
{Name: "UploadedAt", Required: true, Type: bigquery.TimestampFieldType},
{Name: "UploadedDate", Required: true, Type: bigquery.DateFieldType},
}
type Record struct {
ISBN string
Title string
Url string
Authors string
Publisher string
Categories string
Ccode string
Target string
Format string
Content string
PubDate civil.Date
CreatedAt time.Time
LastUpdatedAt time.Time
UploadedAt time.Time
UploadedDate civil.Date
}
func prepareUploadRecords(bookList *models.BookList) []*bigquery.StructSaver {
uploadedAt := bookList.UploadDate
var savers []*bigquery.StructSaver
for _, book := range bookList.Books {
bookRecord := convertIntoRecord(book, uploadedAt)
savers = append(savers,
&bigquery.StructSaver{
Schema: bqSchema,
Struct: bookRecord,
},
)
}
return savers
}
func convertIntoRecord(book *models.Book, uploadedAt time.Time) *Record {
return &Record{
ISBN: book.Isbn,
Title: book.Title,
Url: book.Url,
Authors: book.Authors,
Publisher: book.Publisher,
Categories: book.Categories,
Ccode: book.Ccode,
Target: book.Target,
Format: book.Format,
Content: book.Content,
PubDate: civil.DateOf(book.PubDate),
CreatedAt: book.CreatedDate,
LastUpdatedAt: book.LastUpdatedDate,
UploadedAt: uploadedAt,
UploadedDate: civil.DateOf(uploadedAt),
}
}
type BQRecorder struct {
client *bigquery.Client
table *bigquery.Table
}
func (s *BQRecorder) createTable(ctx context.Context) error {
metadata := bigquery.TableMetadata{
Schema: bqSchema,
TimePartitioning: &bigquery.TimePartitioning{
Type: bigquery.DayPartitioningType,
Field: "UploadedDate",
},
}
return s.table.Create(ctx, &metadata)
}
type BQSettings struct {
ProjectID string
DatasetName string
TableName string
}
func NewBQRecorder(ctx context.Context, settings *BQSettings) (*BQRecorder, error) {
client, err := bigquery.NewClient(ctx, settings.ProjectID)
if err != nil {
return nil, fmt.Errorf("cannot connect to BigQuery: %s", err)
}
dataset := client.Dataset(settings.DatasetName)
table := dataset.Table(settings.TableName)
recorder := BQRecorder{client: client, table: table}
_, err = table.Metadata(ctx)
if err != nil {
log.Printf("Cannot find the table %s: %s", settings.TableName, err)
if err = recorder.createTable(ctx); err != nil {
return nil, fmt.Errorf("cannot create a table: %s", err)
}
log.Printf("Successfully created the table %s", settings.TableName)
}
return &recorder, nil
}
func (s *BQRecorder) SaveRecords(ctx context.Context, bookList *models.BookList) error {
records := prepareUploadRecords(bookList)
inserter := s.table.Inserter()
err := inserter.Put(ctx, records)
if err != nil {
return fmt.Errorf("upload book records failed: %s", err)
}
return nil
}
func (s *BQRecorder) GetRecordedISBN(ctx context.Context, targetDate time.Time) ([]string, error) {
table := s.table
fullTableID := fmt.Sprintf("`%s.%s.%s`", table.ProjectID, table.DatasetID, table.TableID)
uploadedDate := fmt.Sprintf("\"%s\"", targetDate.Format("2006-01-02"))
q := s.client.Query(`SELECT DISTINCT ISBN FROM ` + fullTableID + ` WHERE UploadedDate=` + uploadedDate)
it, err := q.Read(ctx)
if err != nil {
return nil, fmt.Errorf("query execution failed: %s", err)
}
type QueryResult struct {
ISBN string
}
uploadedISBN := []string{}
for {
var r QueryResult
err := it.Next(&r)
if err == iterator.Done {
break
}
if err != nil {
log.Printf("Unexpected query results: %s", err)
continue
}
uploadedISBN = append(uploadedISBN, r.ISBN)
}
return uploadedISBN, nil
}