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// Copyright (C) MongoDB, Inc. 2017-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 unified
import (
"context"
"fmt"
"go.mongodb.org/mongo-driver/bson"
)
func executeIterateOnce(ctx context.Context, operation *operation) (*operationResult, error) {
cursor, err := entities(ctx).cursor(operation.Object)
if err != nil {
return nil, err
}
// TryNext will attempt to get the next document, potentially issuing a single 'getMore'.
if cursor.TryNext(ctx) {
// We don't expect the server to return malformed documents, so any errors from Decode here are treated
// as fatal.
var res bson.Raw
if err := cursor.Decode(&res); err != nil {
return nil, fmt.Errorf("error decoding cursor result: %w", err)
}
return newDocumentResult(res, nil), nil
}
return newErrorResult(cursor.Err()), nil
}
func executeIterateUntilDocumentOrError(ctx context.Context, operation *operation) (*operationResult, error) {
cursor, err := entities(ctx).cursor(operation.Object)
if err != nil {
return nil, err
}
// Next will loop until there is either a result or an error.
if cursor.Next(ctx) {
// We don't expect the server to return malformed documents, so any errors from Decode are treated as fatal.
var res bson.Raw
if err := cursor.Decode(&res); err != nil {
return nil, fmt.Errorf("error decoding cursor result: %w", err)
}
return newDocumentResult(res, nil), nil
}
return newErrorResult(cursor.Err()), nil
}
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