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db.go
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db.go
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package bigquery
import (
"context"
"fmt"
"strings"
"cloud.google.com/go/bigquery"
"github.com/bruin-data/bruin/pkg/pipeline"
"github.com/bruin-data/bruin/pkg/query"
"github.com/pkg/errors"
"google.golang.org/api/googleapi"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
)
var scopes = []string{
bigquery.Scope,
"https://www.googleapis.com/auth/cloud-platform",
"https://www.googleapis.com/auth/drive",
}
type Querier interface {
RunQueryWithoutResult(ctx context.Context, query *query.Query) error
}
type Selector interface {
Select(ctx context.Context, query *query.Query) ([][]interface{}, error)
}
type MetadataUpdater interface {
UpdateTableMetadataIfNotExist(ctx context.Context, asset *pipeline.Asset) error
}
type DB interface {
Querier
Selector
MetadataUpdater
}
type Client struct {
client *bigquery.Client
config *Config
}
func NewDB(c *Config) (*Client, error) {
options := []option.ClientOption{
option.WithScopes(scopes...),
}
switch {
case c.CredentialsJSON != "":
options = append(options, option.WithCredentialsJSON([]byte(c.CredentialsJSON)))
case c.CredentialsFilePath != "":
options = append(options, option.WithCredentialsFile(c.CredentialsFilePath))
case c.Credentials != nil:
options = append(options, option.WithCredentials(c.Credentials))
default:
return nil, errors.New("no credentials provided")
}
client, err := bigquery.NewClient(
context.Background(),
c.ProjectID,
options...,
)
if err != nil {
return nil, errors.Wrap(err, "failed to create bigquery client")
}
if c.Location != "" {
client.Location = c.Location
}
return &Client{
client: client,
config: c,
}, nil
}
func (d *Client) GetIngestrURI() (string, error) {
return d.config.GetIngestrURI()
}
func (d *Client) IsValid(ctx context.Context, query *query.Query) (bool, error) {
q := d.client.Query(query.ToDryRunQuery())
q.DryRun = true
job, err := q.Run(ctx)
if err != nil {
return false, formatError(err)
}
status := job.LastStatus()
if err := status.Err(); err != nil {
return false, err
}
return true, nil
}
func (d *Client) RunQueryWithoutResult(ctx context.Context, query *query.Query) error {
q := d.client.Query(query.String())
_, err := q.Read(ctx)
if err != nil {
return formatError(err)
}
return nil
}
func (d *Client) Select(ctx context.Context, query *query.Query) ([][]interface{}, error) {
q := d.client.Query(query.String())
rows, err := q.Read(ctx)
if err != nil {
return nil, formatError(err)
}
result := make([][]interface{}, 0)
for {
var values []bigquery.Value
err := rows.Next(&values)
if errors.Is(err, iterator.Done) {
break
}
if err != nil {
return nil, err
}
interfaces := make([]interface{}, len(values))
for i, v := range values {
interfaces[i] = v
}
result = append(result, interfaces)
}
return result, nil
}
type NoMetadataUpdatedError struct{}
func (m NoMetadataUpdatedError) Error() string {
return "no metadata found for the given asset to be pushed to BigQuery"
}
func (d *Client) UpdateTableMetadataIfNotExist(ctx context.Context, asset *pipeline.Asset) error {
anyColumnHasDescription := false
colsByName := make(map[string]*pipeline.Column, len(asset.Columns))
for _, col := range asset.Columns {
colsByName[col.Name] = &col
if col.Description != "" {
anyColumnHasDescription = true
}
}
if asset.Description == "" && (asset.Columns == nil || len(asset.Columns) == 0 || !anyColumnHasDescription) {
return NoMetadataUpdatedError{}
}
tableComponents := strings.Split(asset.Name, ".")
if len(tableComponents) != 2 {
return fmt.Errorf("asset name must be in schema.table format to update the metadata, '%s' given", asset.Name)
}
tableRef := d.client.Dataset(tableComponents[0]).Table(tableComponents[1])
meta, err := tableRef.Metadata(ctx)
if err != nil {
return err
}
schema := meta.Schema
colsChanged := false
for _, field := range schema {
if col, ok := colsByName[field.Name]; ok {
field.Description = col.Description
colsChanged = true
}
}
update := bigquery.TableMetadataToUpdate{}
if colsChanged {
update.Schema = schema
}
if asset.Description != "" {
update.Description = asset.Description
}
primaryKeys := asset.ColumnNamesWithPrimaryKey()
if len(primaryKeys) > 0 {
update.TableConstraints = &bigquery.TableConstraints{
PrimaryKey: &bigquery.PrimaryKey{Columns: primaryKeys},
}
}
if _, err = tableRef.Update(ctx, update, meta.ETag); err != nil {
return errors.Wrap(err, "failed to update table metadata")
}
return nil
}
func formatError(err error) error {
var googleError *googleapi.Error
if !errors.As(err, &googleError) {
return err
}
if googleError.Code == 404 || googleError.Code == 400 {
return fmt.Errorf("%s", googleError.Message)
}
return googleError
}