mirror of
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136 lines
4.6 KiB
Go
136 lines
4.6 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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bq "google.golang.org/api/bigquery/v2"
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)
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// A ReaderSource is a source for a load operation that gets
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// data from an io.Reader.
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//
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// When a ReaderSource is part of a LoadConfig obtained via Job.Config,
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// its internal io.Reader will be nil, so it cannot be used for a
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// subsequent load operation.
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type ReaderSource struct {
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r io.Reader
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FileConfig
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}
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// NewReaderSource creates a ReaderSource from an io.Reader. You may
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// optionally configure properties on the ReaderSource that describe the
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// data being read, before passing it to Table.LoaderFrom.
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func NewReaderSource(r io.Reader) *ReaderSource {
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return &ReaderSource{r: r}
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}
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func (r *ReaderSource) populateLoadConfig(lc *bq.JobConfigurationLoad) io.Reader {
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r.FileConfig.populateLoadConfig(lc)
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return r.r
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}
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// FileConfig contains configuration options that pertain to files, typically
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// text files that require interpretation to be used as a BigQuery table. A
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// file may live in Google Cloud Storage (see GCSReference), or it may be
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// loaded into a table via the Table.LoaderFromReader.
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type FileConfig struct {
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// SourceFormat is the format of the GCS data to be read.
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// Allowed values are: CSV, Avro, JSON, DatastoreBackup. The default is CSV.
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SourceFormat DataFormat
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// Indicates if we should automatically infer the options and
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// schema for CSV and JSON sources.
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AutoDetect bool
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// MaxBadRecords is the maximum number of bad records that will be ignored
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// when reading data.
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MaxBadRecords int64
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// IgnoreUnknownValues causes values not matching the schema to be
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// tolerated. Unknown values are ignored. For CSV this ignores extra values
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// at the end of a line. For JSON this ignores named values that do not
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// match any column name. If this field is not set, records containing
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// unknown values are treated as bad records. The MaxBadRecords field can
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// be used to customize how bad records are handled.
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IgnoreUnknownValues bool
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// Schema describes the data. It is required when reading CSV or JSON data,
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// unless the data is being loaded into a table that already exists.
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Schema Schema
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// Additional options for CSV files.
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CSVOptions
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}
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func (fc *FileConfig) populateLoadConfig(conf *bq.JobConfigurationLoad) {
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conf.SkipLeadingRows = fc.SkipLeadingRows
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conf.SourceFormat = string(fc.SourceFormat)
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conf.Autodetect = fc.AutoDetect
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conf.AllowJaggedRows = fc.AllowJaggedRows
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conf.AllowQuotedNewlines = fc.AllowQuotedNewlines
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conf.Encoding = string(fc.Encoding)
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conf.FieldDelimiter = fc.FieldDelimiter
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conf.IgnoreUnknownValues = fc.IgnoreUnknownValues
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conf.MaxBadRecords = fc.MaxBadRecords
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if fc.Schema != nil {
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conf.Schema = fc.Schema.toBQ()
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}
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conf.Quote = fc.quote()
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}
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func bqPopulateFileConfig(conf *bq.JobConfigurationLoad, fc *FileConfig) {
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fc.SourceFormat = DataFormat(conf.SourceFormat)
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fc.AutoDetect = conf.Autodetect
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fc.MaxBadRecords = conf.MaxBadRecords
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fc.IgnoreUnknownValues = conf.IgnoreUnknownValues
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fc.Schema = bqToSchema(conf.Schema)
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fc.SkipLeadingRows = conf.SkipLeadingRows
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fc.AllowJaggedRows = conf.AllowJaggedRows
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fc.AllowQuotedNewlines = conf.AllowQuotedNewlines
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fc.Encoding = Encoding(conf.Encoding)
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fc.FieldDelimiter = conf.FieldDelimiter
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fc.CSVOptions.setQuote(conf.Quote)
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}
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func (fc *FileConfig) populateExternalDataConfig(conf *bq.ExternalDataConfiguration) {
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format := fc.SourceFormat
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if format == "" {
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// Format must be explicitly set for external data sources.
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format = CSV
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}
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conf.Autodetect = fc.AutoDetect
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conf.IgnoreUnknownValues = fc.IgnoreUnknownValues
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conf.MaxBadRecords = fc.MaxBadRecords
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conf.SourceFormat = string(format)
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if fc.Schema != nil {
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conf.Schema = fc.Schema.toBQ()
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}
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if format == CSV {
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fc.CSVOptions.populateExternalDataConfig(conf)
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}
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}
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// Encoding specifies the character encoding of data to be loaded into BigQuery.
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// See https://cloud.google.com/bigquery/docs/reference/v2/jobs#configuration.load.encoding
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// for more details about how this is used.
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type Encoding string
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const (
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UTF_8 Encoding = "UTF-8"
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ISO_8859_1 Encoding = "ISO-8859-1"
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)
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