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bigquery.go
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/
bigquery.go
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// Copyright 2023 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
//
// http://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 bigquery
import (
"context"
"fmt"
"strings"
"cloud.google.com/go/bigquery"
"google.golang.org/api/option"
"google.golang.org/grpc/credentials/oauth"
)
// parseResourceSpec parses spec as per the bq command-line tool format described
// here: https://cloud.google.com/bigquery/docs/reference/bq-cli-reference#resource_specification.
// spec should be in the form <project>:<dataset>.<table> or <dataset>.<table>
func parseResourceSpec(spec, defaultProject string) (project, dataset, table string, err error) {
project = defaultProject
if strings.ContainsRune(spec, ':') {
chunks := strings.Split(spec, ":")
if len(chunks) != 2 {
return "", "", "", fmt.Errorf("bigquery resource spec should have form <project>:<dataset>.<table> or <dataset>.<table>, got %s", spec)
}
project = chunks[0]
spec = chunks[1]
}
if project == "" {
return "", "", "", fmt.Errorf("project not specified, either BQ resource spec should have form <project>:<dataset>.<table> or a default project should be specified")
}
chunks := strings.Split(spec, ".")
if len(chunks) != 2 {
return "", "", "", fmt.Errorf("bigquery resource spec should have form <project>:<dataset>.<table> or <dataset>.<table>, got %s", spec)
}
return project, chunks[0], chunks[1], nil
}
// NewInserter creates a an inserter for the table specified by the given resourceSpec in
// the form <project>:<dataset>.<table> or <dataset>.<table>
func NewInserter(ctx context.Context, resourceSpec, defaultProject string, ts *oauth.TokenSource) (inserter *bigquery.Inserter, cleanup func() error, err error) {
project, dataset, table, err := parseResourceSpec(resourceSpec, defaultProject)
cleanup = func() error { return nil }
if err != nil {
return nil, cleanup, err
}
var opts []option.ClientOption
if ts != nil {
opts = append(opts, option.WithTokenSource(ts))
}
client, err := bigquery.NewClient(ctx, project, opts...)
if err != nil {
return nil, cleanup, err
}
return client.Dataset(dataset).Table(table).Inserter(), client.Close, nil
}