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// Copyright 2016 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"
bq "google.golang.org/api/bigquery/v2"
)
// CopyConfig holds the configuration for a copy job.
type CopyConfig struct {
// Srcs are the tables from which data will be copied.
Srcs []*Table
// Dst is the table into which the data will be copied.
Dst *Table
// CreateDisposition specifies the circumstances under which the destination table will be created.
// The default is CreateIfNeeded.
CreateDisposition TableCreateDisposition
// WriteDisposition specifies how existing data in the destination table is treated.
// The default is WriteEmpty.
WriteDisposition TableWriteDisposition
// The labels associated with this job.
Labels map[string]string
// Custom encryption configuration (e.g., Cloud KMS keys).
DestinationEncryptionConfig *EncryptionConfig
}
func (c *CopyConfig) toBQ() *bq.JobConfiguration {
var ts []*bq.TableReference
for _, t := range c.Srcs {
ts = append(ts, t.toBQ())
}
return &bq.JobConfiguration{
Labels: c.Labels,
Copy: &bq.JobConfigurationTableCopy{
CreateDisposition: string(c.CreateDisposition),
WriteDisposition: string(c.WriteDisposition),
DestinationTable: c.Dst.toBQ(),
DestinationEncryptionConfiguration: c.DestinationEncryptionConfig.toBQ(),
SourceTables: ts,
},
}
}
func bqToCopyConfig(q *bq.JobConfiguration, c *Client) *CopyConfig {
cc := &CopyConfig{
Labels: q.Labels,
CreateDisposition: TableCreateDisposition(q.Copy.CreateDisposition),
WriteDisposition: TableWriteDisposition(q.Copy.WriteDisposition),
Dst: bqToTable(q.Copy.DestinationTable, c),
DestinationEncryptionConfig: bqToEncryptionConfig(q.Copy.DestinationEncryptionConfiguration),
}
for _, t := range q.Copy.SourceTables {
cc.Srcs = append(cc.Srcs, bqToTable(t, c))
}
return cc
}
// A Copier copies data into a BigQuery table from one or more BigQuery tables.
type Copier struct {
JobIDConfig
CopyConfig
c *Client
}
// CopierFrom returns a Copier which can be used to copy data into a
// BigQuery table from one or more BigQuery tables.
// The returned Copier may optionally be further configured before its Run method is called.
func (t *Table) CopierFrom(srcs ...*Table) *Copier {
return &Copier{
c: t.c,
CopyConfig: CopyConfig{
Srcs: srcs,
Dst: t,
},
}
}
// Run initiates a copy job.
func (c *Copier) Run(ctx context.Context) (*Job, error) {
return c.c.insertJob(ctx, c.newJob(), nil)
}
func (c *Copier) newJob() *bq.Job {
return &bq.Job{
JobReference: c.JobIDConfig.createJobRef(c.c),
Configuration: c.CopyConfig.toBQ(),
}
}
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