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extract and document serialization failure check

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This commit is contained in:
Alex Suraci 2018-11-20 09:42:30 -05:00
parent 587081a643
commit 85dd0684ba
1 changed files with 17 additions and 4 deletions
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21
storage/sql/sql.go
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@ -40,6 +40,21 @@ func matchLiteral(s string) *regexp.Regexp {
return regexp.MustCompile(`\b` + regexp.QuoteMeta(s) + `\b`)
}
// Detect a serialization failure, which should trigger retrying the
// transaction according to PostgreSQL docs:
//
// https://www.postgresql.org/docs/current/transaction-iso.html#XACT-SERIALIZABLE
//
// "applications using this level must be prepared to retry transactions due to
// serialization failures"
func isRetryableSerializationFailure(err error) bool {
if pqErr, ok := err.(*pq.Error); ok {
return pqErr.Code.Name() == "serialization_failure"
}
return false
}
var (
// The "github.com/lib/pq" driver is the default flavor. All others are
// translations of this.
@ -67,8 +82,7 @@ var (
}
if err := fn(tx); err != nil {
if pqErr, ok := err.(*pq.Error); ok && pqErr.Code.Name() == "serialization_failure" {
// serialization error; retry
if isRetryableSerializationFailure(err) {
continue
}
@ -77,8 +91,7 @@ var (
err = tx.Commit()
if err != nil {
if pqErr, ok := err.(*pq.Error); ok && pqErr.Code.Name() == "serialization_failure" {
// serialization error; retry
if isRetryableSerializationFailure(err) {
continue
}