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// Copyright 2015 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 (
"io"
bq "google.golang.org/api/bigquery/v2"
)
// GCSReference is a reference to one or more Google Cloud Storage objects, which together constitute
// an input or output to a BigQuery operation.
type GCSReference struct {
// URIs refer to Google Cloud Storage objects.
URIs []string
FileConfig
// DestinationFormat is the format to use when writing exported files.
// Allowed values are: CSV, Avro, JSON. The default is CSV.
// CSV is not supported for tables with nested or repeated fields.
DestinationFormat DataFormat
// Compression specifies the type of compression to apply when writing data
// to Google Cloud Storage, or using this GCSReference as an ExternalData
// source with CSV or JSON SourceFormat. Default is None.
//
// Avro files allow additional compression types: DEFLATE and SNAPPY.
Compression Compression
}
// NewGCSReference constructs a reference to one or more Google Cloud Storage objects, which together constitute a data source or destination.
// In the simple case, a single URI in the form gs://bucket/object may refer to a single GCS object.
// Data may also be split into mutiple files, if multiple URIs or URIs containing wildcards are provided.
// Each URI may contain one '*' wildcard character, which (if present) must come after the bucket name.
// For more information about the treatment of wildcards and multiple URIs,
// see https://cloud.google.com/bigquery/exporting-data-from-bigquery#exportingmultiple
func NewGCSReference(uri ...string) *GCSReference {
return &GCSReference{URIs: uri}
}
// Compression is the type of compression to apply when writing data to Google Cloud Storage.
type Compression string
const (
// None specifies no compression.
None Compression = "NONE"
// Gzip specifies gzip compression.
Gzip Compression = "GZIP"
// Deflate specifies DEFLATE compression for Avro files.
Deflate Compression = "DEFLATE"
// Snappy specifies SNAPPY compression for Avro files.
Snappy Compression = "SNAPPY"
)
func (gcs *GCSReference) populateLoadConfig(lc *bq.JobConfigurationLoad) io.Reader {
lc.SourceUris = gcs.URIs
gcs.FileConfig.populateLoadConfig(lc)
return nil
}
func (gcs *GCSReference) toBQ() bq.ExternalDataConfiguration {
conf := bq.ExternalDataConfiguration{
Compression: string(gcs.Compression),
SourceUris: append([]string{}, gcs.URIs...),
}
gcs.FileConfig.populateExternalDataConfig(&conf)
return conf
}
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