logmower-shipper/vendor/go.mongodb.org/mongo-driver/x/mongo/driver/batches.go
rasmus e45bf4739b go mod vendor
+ move k8s.io/apimachinery fork from go.work to go.mod
(and include it in vendor)
2022-11-07 00:26:05 +02:00

77 lines
2.4 KiB
Go

// Copyright (C) MongoDB, Inc. 2022-present.
//
// 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
package driver
import (
"errors"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
)
// ErrDocumentTooLarge occurs when a document that is larger than the maximum size accepted by a
// server is passed to an insert command.
var ErrDocumentTooLarge = errors.New("an inserted document is too large")
// Batches contains the necessary information to batch split an operation. This is only used for write
// oeprations.
type Batches struct {
Identifier string
Documents []bsoncore.Document
Current []bsoncore.Document
Ordered *bool
}
// Valid returns true if Batches contains both an identifier and the length of Documents is greater
// than zero.
func (b *Batches) Valid() bool { return b != nil && b.Identifier != "" && len(b.Documents) > 0 }
// ClearBatch clears the Current batch. This must be called before AdvanceBatch will advance to the
// next batch.
func (b *Batches) ClearBatch() { b.Current = b.Current[:0] }
// AdvanceBatch splits the next batch using maxCount and targetBatchSize. This method will do nothing if
// the current batch has not been cleared. We do this so that when this is called during execute we
// can call it without first needing to check if we already have a batch, which makes the code
// simpler and makes retrying easier.
// The maxDocSize parameter is used to check that any one document is not too large. If the first document is bigger
// than targetBatchSize but smaller than maxDocSize, a batch of size 1 containing that document will be created.
func (b *Batches) AdvanceBatch(maxCount, targetBatchSize, maxDocSize int) error {
if len(b.Current) > 0 {
return nil
}
if maxCount <= 0 {
maxCount = 1
}
splitAfter := 0
size := 0
for i, doc := range b.Documents {
if i == maxCount {
break
}
if len(doc) > maxDocSize {
return ErrDocumentTooLarge
}
if size+len(doc) > targetBatchSize {
break
}
size += len(doc)
splitAfter++
}
// if there are no documents, take the first one.
// this can happen if there is a document that is smaller than maxDocSize but greater than targetBatchSize.
if splitAfter == 0 {
splitAfter = 1
}
b.Current, b.Documents = b.Documents[:splitAfter], b.Documents[splitAfter:]
return nil
}