mirror of
https://github.com/restic/restic.git
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178 lines
5.6 KiB
Go
178 lines
5.6 KiB
Go
// Copyright 2015 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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"errors"
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"fmt"
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"reflect"
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"golang.org/x/net/context"
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)
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// An Uploader does streaming inserts into a BigQuery table.
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// It is safe for concurrent use.
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type Uploader struct {
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t *Table
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// SkipInvalidRows causes rows containing invalid data to be silently
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// ignored. The default value is false, which causes the entire request to
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// fail if there is an attempt to insert an invalid row.
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SkipInvalidRows bool
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// IgnoreUnknownValues causes values not matching the schema to be ignored.
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// The default value is false, which causes records containing such values
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// to be treated as invalid records.
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IgnoreUnknownValues bool
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// A TableTemplateSuffix allows Uploaders to create tables automatically.
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//
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// Experimental: this option is experimental and may be modified or removed in future versions,
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// regardless of any other documented package stability guarantees.
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//
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// When you specify a suffix, the table you upload data to
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// will be used as a template for creating a new table, with the same schema,
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// called <table> + <suffix>.
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//
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// More information is available at
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// https://cloud.google.com/bigquery/streaming-data-into-bigquery#template-tables
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TableTemplateSuffix string
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}
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// Uploader returns an Uploader that can be used to append rows to t.
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// The returned Uploader may optionally be further configured before its Put method is called.
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func (t *Table) Uploader() *Uploader {
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return &Uploader{t: t}
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}
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// Put uploads one or more rows to the BigQuery service.
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//
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// If src is ValueSaver, then its Save method is called to produce a row for uploading.
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//
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// If src is a struct or pointer to a struct, then a schema is inferred from it
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// and used to create a StructSaver. The InsertID of the StructSaver will be
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// empty.
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//
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// If src is a slice of ValueSavers, structs, or struct pointers, then each
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// element of the slice is treated as above, and multiple rows are uploaded.
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//
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// Put returns a PutMultiError if one or more rows failed to be uploaded.
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// The PutMultiError contains a RowInsertionError for each failed row.
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//
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// Put will retry on temporary errors (see
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// https://cloud.google.com/bigquery/troubleshooting-errors). This can result
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// in duplicate rows if you do not use insert IDs. Also, if the error persists,
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// the call will run indefinitely. Pass a context with a timeout to prevent
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// hanging calls.
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func (u *Uploader) Put(ctx context.Context, src interface{}) error {
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savers, err := valueSavers(src)
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if err != nil {
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return err
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}
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return u.putMulti(ctx, savers)
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}
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func valueSavers(src interface{}) ([]ValueSaver, error) {
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saver, ok, err := toValueSaver(src)
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if err != nil {
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return nil, err
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}
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if ok {
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return []ValueSaver{saver}, nil
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}
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srcVal := reflect.ValueOf(src)
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if srcVal.Kind() != reflect.Slice {
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return nil, fmt.Errorf("%T is not a ValueSaver, struct, struct pointer, or slice", src)
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}
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var savers []ValueSaver
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for i := 0; i < srcVal.Len(); i++ {
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s := srcVal.Index(i).Interface()
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saver, ok, err := toValueSaver(s)
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if err != nil {
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return nil, err
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}
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if !ok {
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return nil, fmt.Errorf("src[%d] has type %T, which is not a ValueSaver, struct or struct pointer", i, s)
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}
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savers = append(savers, saver)
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}
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return savers, nil
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}
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// Make a ValueSaver from x, which must implement ValueSaver already
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// or be a struct or pointer to struct.
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func toValueSaver(x interface{}) (ValueSaver, bool, error) {
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if _, ok := x.(StructSaver); ok {
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return nil, false, errors.New("bigquery: use &StructSaver, not StructSaver")
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}
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var insertID string
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// Handle StructSavers specially so we can infer the schema if necessary.
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if ss, ok := x.(*StructSaver); ok && ss.Schema == nil {
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x = ss.Struct
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insertID = ss.InsertID
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// Fall through so we can infer the schema.
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}
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if saver, ok := x.(ValueSaver); ok {
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return saver, ok, nil
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}
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v := reflect.ValueOf(x)
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// Support Put with []interface{}
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if v.Kind() == reflect.Interface {
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v = v.Elem()
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}
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if v.Kind() == reflect.Ptr {
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v = v.Elem()
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}
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if v.Kind() != reflect.Struct {
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return nil, false, nil
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}
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schema, err := inferSchemaReflectCached(v.Type())
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if err != nil {
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return nil, false, err
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}
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return &StructSaver{
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Struct: x,
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InsertID: insertID,
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Schema: schema,
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}, true, nil
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}
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func (u *Uploader) putMulti(ctx context.Context, src []ValueSaver) error {
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var rows []*insertionRow
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for _, saver := range src {
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row, insertID, err := saver.Save()
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if err != nil {
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return err
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}
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rows = append(rows, &insertionRow{InsertID: insertID, Row: row})
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}
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return u.t.c.service.insertRows(ctx, u.t.ProjectID, u.t.DatasetID, u.t.TableID, rows, &insertRowsConf{
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skipInvalidRows: u.SkipInvalidRows,
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ignoreUnknownValues: u.IgnoreUnknownValues,
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templateSuffix: u.TableTemplateSuffix,
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})
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}
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// An insertionRow represents a row of data to be inserted into a table.
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type insertionRow struct {
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// If InsertID is non-empty, BigQuery will use it to de-duplicate insertions of
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// this row on a best-effort basis.
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InsertID string
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// The data to be inserted, represented as a map from field name to Value.
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Row map[string]Value
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}
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