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package driver
import (
"errors"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
)
// this is the amount of reserved buffer space in a message that the
// driver reserves for command overhead.
const reservedCommandBufferBytes = 16 * 10 * 10 * 10
// 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.
func (b *Batches) AdvanceBatch(maxCount, targetBatchSize int) error {
if len(b.Current) > 0 {
return nil
}
if targetBatchSize > reservedCommandBufferBytes {
targetBatchSize -= reservedCommandBufferBytes
}
if maxCount <= 0 {
maxCount = 1
}
splitAfter := 0
size := 1
for i, doc := range b.Documents {
if i == maxCount {
break
}
if len(doc) > targetBatchSize {
return ErrDocumentTooLarge
}
if size+len(doc) > targetBatchSize {
break
}
size += len(doc)
splitAfter++
}
b.Current, b.Documents = b.Documents[:splitAfter], b.Documents[splitAfter:]
return nil
}
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