/
load.go
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/
load.go
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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"
"io"
"time"
"cloud.google.com/go/internal/trace"
bq "google.golang.org/api/bigquery/v2"
"google.golang.org/api/googleapi"
)
// LoadConfig holds the configuration for a load job.
type LoadConfig struct {
// Src is the source from which data will be loaded.
Src LoadSource
// Dst is the table into which the data will be loaded.
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 WriteAppend.
WriteDisposition TableWriteDisposition
// The labels associated with this job.
Labels map[string]string
// If non-nil, the destination table is partitioned by time.
TimePartitioning *TimePartitioning
// If non-nil, the destination table is partitioned by integer range.
RangePartitioning *RangePartitioning
// Clustering specifies the data clustering configuration for the destination table.
Clustering *Clustering
// Custom encryption configuration (e.g., Cloud KMS keys).
DestinationEncryptionConfig *EncryptionConfig
// Allows the schema of the destination table to be updated as a side effect of
// the load job.
SchemaUpdateOptions []string
// For Avro-based loads, controls whether logical type annotations are used.
// See https://cloud.google.com/bigquery/docs/loading-data-cloud-storage-avro#logical_types
// for additional information.
UseAvroLogicalTypes bool
// For ingestion from datastore backups, ProjectionFields governs which fields
// are projected from the backup. The default behavior projects all fields.
ProjectionFields []string
// HivePartitioningOptions allows use of Hive partitioning based on the
// layout of objects in Cloud Storage.
HivePartitioningOptions *HivePartitioningOptions
// DecimalTargetTypes allows selection of how decimal values are converted when
// processed in bigquery, subject to the value type having sufficient precision/scale
// to support the values. In the order of NUMERIC, BIGNUMERIC, and STRING, a type is
// selected if is present in the list and if supports the necessary precision and scale.
//
// StringTargetType supports all precision and scale values.
DecimalTargetTypes []DecimalTargetType
// Sets a best-effort deadline on a specific job. If job execution exceeds this
// timeout, BigQuery may attempt to cancel this work automatically.
//
// This deadline cannot be adjusted or removed once the job is created. Consider
// using Job.Cancel in situations where you need more dynamic behavior.
//
// Experimental: this option is experimental and may be modified or removed in future versions,
// regardless of any other documented package stability guarantees.
JobTimeout time.Duration
// When loading a table with external data, the user can provide a reference file with the table schema.
// This is enabled for the following formats: AVRO, PARQUET, ORC.
ReferenceFileSchemaURI string
// If true, creates a new session, where session id will
// be a server generated random id. If false, runs query with an
// existing session_id passed in ConnectionProperty, otherwise runs the
// load job in non-session mode.
CreateSession bool
// ConnectionProperties are optional key-values settings.
ConnectionProperties []*ConnectionProperty
// MediaOptions stores options for customizing media upload.
MediaOptions []googleapi.MediaOption
}
func (l *LoadConfig) toBQ() (*bq.JobConfiguration, io.Reader) {
config := &bq.JobConfiguration{
Labels: l.Labels,
Load: &bq.JobConfigurationLoad{
CreateDisposition: string(l.CreateDisposition),
WriteDisposition: string(l.WriteDisposition),
DestinationTable: l.Dst.toBQ(),
TimePartitioning: l.TimePartitioning.toBQ(),
RangePartitioning: l.RangePartitioning.toBQ(),
Clustering: l.Clustering.toBQ(),
DestinationEncryptionConfiguration: l.DestinationEncryptionConfig.toBQ(),
SchemaUpdateOptions: l.SchemaUpdateOptions,
UseAvroLogicalTypes: l.UseAvroLogicalTypes,
ProjectionFields: l.ProjectionFields,
HivePartitioningOptions: l.HivePartitioningOptions.toBQ(),
ReferenceFileSchemaUri: l.ReferenceFileSchemaURI,
CreateSession: l.CreateSession,
},
JobTimeoutMs: l.JobTimeout.Milliseconds(),
}
for _, v := range l.DecimalTargetTypes {
config.Load.DecimalTargetTypes = append(config.Load.DecimalTargetTypes, string(v))
}
for _, v := range l.ConnectionProperties {
config.Load.ConnectionProperties = append(config.Load.ConnectionProperties, v.toBQ())
}
media := l.Src.populateLoadConfig(config.Load)
return config, media
}
func bqToLoadConfig(q *bq.JobConfiguration, c *Client) *LoadConfig {
lc := &LoadConfig{
Labels: q.Labels,
CreateDisposition: TableCreateDisposition(q.Load.CreateDisposition),
WriteDisposition: TableWriteDisposition(q.Load.WriteDisposition),
Dst: bqToTable(q.Load.DestinationTable, c),
TimePartitioning: bqToTimePartitioning(q.Load.TimePartitioning),
RangePartitioning: bqToRangePartitioning(q.Load.RangePartitioning),
Clustering: bqToClustering(q.Load.Clustering),
DestinationEncryptionConfig: bqToEncryptionConfig(q.Load.DestinationEncryptionConfiguration),
SchemaUpdateOptions: q.Load.SchemaUpdateOptions,
UseAvroLogicalTypes: q.Load.UseAvroLogicalTypes,
ProjectionFields: q.Load.ProjectionFields,
HivePartitioningOptions: bqToHivePartitioningOptions(q.Load.HivePartitioningOptions),
ReferenceFileSchemaURI: q.Load.ReferenceFileSchemaUri,
CreateSession: q.Load.CreateSession,
}
if q.JobTimeoutMs > 0 {
lc.JobTimeout = time.Duration(q.JobTimeoutMs) * time.Millisecond
}
for _, v := range q.Load.DecimalTargetTypes {
lc.DecimalTargetTypes = append(lc.DecimalTargetTypes, DecimalTargetType(v))
}
for _, v := range q.Load.ConnectionProperties {
lc.ConnectionProperties = append(lc.ConnectionProperties, bqToConnectionProperty(v))
}
var fc *FileConfig
if len(q.Load.SourceUris) == 0 {
s := NewReaderSource(nil)
fc = &s.FileConfig
lc.Src = s
} else {
s := NewGCSReference(q.Load.SourceUris...)
fc = &s.FileConfig
lc.Src = s
}
bqPopulateFileConfig(q.Load, fc)
return lc
}
// A Loader loads data from Google Cloud Storage into a BigQuery table.
type Loader struct {
JobIDConfig
LoadConfig
c *Client
}
// A LoadSource represents a source of data that can be loaded into
// a BigQuery table.
//
// This package defines two LoadSources: GCSReference, for Google Cloud Storage
// objects, and ReaderSource, for data read from an io.Reader.
type LoadSource interface {
// populates config, returns media
populateLoadConfig(*bq.JobConfigurationLoad) io.Reader
}
// LoaderFrom returns a Loader which can be used to load data into a BigQuery table.
// The returned Loader may optionally be further configured before its Run method is called.
// See GCSReference and ReaderSource for additional configuration options that
// affect loading.
func (t *Table) LoaderFrom(src LoadSource) *Loader {
return &Loader{
c: t.c,
LoadConfig: LoadConfig{
Src: src,
Dst: t,
},
}
}
// Run initiates a load job.
func (l *Loader) Run(ctx context.Context) (j *Job, err error) {
ctx = trace.StartSpan(ctx, "cloud.google.com/go/bigquery.Load.Run")
defer func() { trace.EndSpan(ctx, err) }()
job, media := l.newJob()
return l.c.insertJob(ctx, job, media, l.LoadConfig.MediaOptions...)
}
func (l *Loader) newJob() (*bq.Job, io.Reader) {
config, media := l.LoadConfig.toBQ()
return &bq.Job{
JobReference: l.JobIDConfig.createJobRef(l.c),
Configuration: config,
}, media
}
// DecimalTargetType is used to express preference ordering for converting values from external formats.
type DecimalTargetType string
var (
// NumericTargetType indicates the preferred type is NUMERIC when supported.
NumericTargetType DecimalTargetType = "NUMERIC"
// BigNumericTargetType indicates the preferred type is BIGNUMERIC when supported.
BigNumericTargetType DecimalTargetType = "BIGNUMERIC"
// StringTargetType indicates the preferred type is STRING when supported.
StringTargetType DecimalTargetType = "STRING"
)