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error.go
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error.go
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package dynamodb
import (
"errors"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
"github.com/hashicorp/go-multierror"
)
const (
TransactionConflictError = errorTransactionConflict("transaction conflict")
cancellationReasonNone = "None"
cancellationReasonConditionCheckFailed = "ConditionalCheckFailed"
cancellationReasonTransactionConflict = "TransactionConflict"
)
type ConditionalCheckFailedError struct {
Exception *types.TransactionCanceledException
}
func (e ConditionalCheckFailedError) Unwrap() error {
return e.Exception
}
func (e ConditionalCheckFailedError) Error() string {
return "conditional check failed"
}
type errorTransactionConflict string
func (e errorTransactionConflict) Error() string {
return string(e)
}
func TransformTransactionError(err error) error {
var tcoErr *types.TransactionConflictException
if errors.As(err, &tcoErr) {
return TransactionConflictError
}
var tcaErr *types.TransactionCanceledException
if !errors.As(err, &tcaErr) {
return err
}
multiErr := &multierror.Error{}
for _, r := range tcaErr.CancellationReasons {
switch *r.Code {
case cancellationReasonNone:
continue
case cancellationReasonTransactionConflict:
multiErr = multierror.Append(multiErr, TransactionConflictError)
case cancellationReasonConditionCheckFailed:
multiErr = multierror.Append(multiErr, ConditionalCheckFailedError{tcaErr})
default:
multiErr = multierror.Append(multiErr, errors.New(*r.Code))
}
}
return multiErr.ErrorOrNil()
}
type RetryOnTransactionConflict struct{}
// IsErrorRetryable reacts on TransactionConflicts within transactional operations
// Transaction Conflicts occur when using a transactions and multiple calls want to change the same resource.
// This is usually resolvable by retrying
func (r RetryOnTransactionConflict) IsErrorRetryable(err error) aws.Ternary {
err = TransformTransactionError(err)
if errors.Is(err, TransactionConflictError) {
return aws.TrueTernary
}
return aws.UnknownTernary
}
type RetryOnConditionalCheckFailed struct{}
// IsErrorRetryable reacts on failed ConditionalChecks within transactional operations
// When a condition fails within one transaction, this usually indicates an operation which should not be executed.
// Thus, it should never be retried
func (r RetryOnConditionalCheckFailed) IsErrorRetryable(err error) aws.Ternary {
err = TransformTransactionError(err)
if errors.As(err, &ConditionalCheckFailedError{}) {
return aws.FalseTernary
}
return aws.UnknownTernary
}