mirror of
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127 lines
3.7 KiB
Go
127 lines
3.7 KiB
Go
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bigquery
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import (
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"io"
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"golang.org/x/net/context"
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bq "google.golang.org/api/bigquery/v2"
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)
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// LoadConfig holds the configuration for a load job.
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type LoadConfig struct {
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// Src is the source from which data will be loaded.
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Src LoadSource
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// Dst is the table into which the data will be loaded.
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Dst *Table
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// CreateDisposition specifies the circumstances under which the destination table will be created.
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// The default is CreateIfNeeded.
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CreateDisposition TableCreateDisposition
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// WriteDisposition specifies how existing data in the destination table is treated.
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// The default is WriteAppend.
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WriteDisposition TableWriteDisposition
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// The labels associated with this job.
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Labels map[string]string
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// If non-nil, the destination table is partitioned by time.
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TimePartitioning *TimePartitioning
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}
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func (l *LoadConfig) toBQ() (*bq.JobConfiguration, io.Reader) {
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config := &bq.JobConfiguration{
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Labels: l.Labels,
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Load: &bq.JobConfigurationLoad{
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CreateDisposition: string(l.CreateDisposition),
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WriteDisposition: string(l.WriteDisposition),
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DestinationTable: l.Dst.toBQ(),
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TimePartitioning: l.TimePartitioning.toBQ(),
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},
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}
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media := l.Src.populateLoadConfig(config.Load)
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return config, media
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}
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func bqToLoadConfig(q *bq.JobConfiguration, c *Client) *LoadConfig {
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lc := &LoadConfig{
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Labels: q.Labels,
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CreateDisposition: TableCreateDisposition(q.Load.CreateDisposition),
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WriteDisposition: TableWriteDisposition(q.Load.WriteDisposition),
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Dst: bqToTable(q.Load.DestinationTable, c),
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TimePartitioning: bqToTimePartitioning(q.Load.TimePartitioning),
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}
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var fc *FileConfig
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if len(q.Load.SourceUris) == 0 {
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s := NewReaderSource(nil)
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fc = &s.FileConfig
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lc.Src = s
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} else {
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s := NewGCSReference(q.Load.SourceUris...)
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fc = &s.FileConfig
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lc.Src = s
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}
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bqPopulateFileConfig(q.Load, fc)
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return lc
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}
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// A Loader loads data from Google Cloud Storage into a BigQuery table.
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type Loader struct {
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JobIDConfig
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LoadConfig
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c *Client
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}
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// A LoadSource represents a source of data that can be loaded into
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// a BigQuery table.
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//
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// This package defines two LoadSources: GCSReference, for Google Cloud Storage
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// objects, and ReaderSource, for data read from an io.Reader.
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type LoadSource interface {
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// populates config, returns media
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populateLoadConfig(*bq.JobConfigurationLoad) io.Reader
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}
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// LoaderFrom returns a Loader which can be used to load data into a BigQuery table.
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// The returned Loader may optionally be further configured before its Run method is called.
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// See GCSReference and ReaderSource for additional configuration options that
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// affect loading.
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func (t *Table) LoaderFrom(src LoadSource) *Loader {
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return &Loader{
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c: t.c,
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LoadConfig: LoadConfig{
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Src: src,
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Dst: t,
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},
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}
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}
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// Run initiates a load job.
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func (l *Loader) Run(ctx context.Context) (*Job, error) {
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job, media := l.newJob()
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return l.c.insertJob(ctx, job, media)
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}
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func (l *Loader) newJob() (*bq.Job, io.Reader) {
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config, media := l.LoadConfig.toBQ()
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return &bq.Job{
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JobReference: l.JobIDConfig.createJobRef(l.c.projectID),
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Configuration: config,
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}, media
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}
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