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package retry
import (
"database/sql"
"database/sql/driver"
"net"
"strings"
"github.com/pkg/errors"
"github.com/target/goalert/util/sqlutil"
)
type clientErr interface {
ClientError() bool
}
type tempErr interface {
Temporary() bool
}
// TemporaryError returns an error that will always be classified as temporary.
func TemporaryError(err error) error {
return tempErrWrap{error: err}
}
type tempErrWrap struct {
error
}
func (e tempErrWrap) Temporary() bool { return true }
// IsTemporaryError will determine if an error is temporary, and thus
// the action can/should be retried.
func IsTemporaryError(err error) bool {
if err == nil {
return false
}
var cliErr clientErr
if errors.As(err, &cliErr) && cliErr.ClientError() {
return false
}
var netErr net.Error
if errors.As(err, &netErr) {
return true
}
var tempErr tempErr
if errors.As(err, &tempErr) && tempErr.Temporary() {
return true
}
if errors.Is(err, sql.ErrConnDone) {
return true
}
if errors.Is(err, driver.ErrBadConn) {
return true
}
if e := sqlutil.MapError(err); e != nil {
switch {
// Allow retry for tx or connection errors:
// - Class 40 — Transaction Rollback
// - Class 08 — Connection Exception
//
// https://www.postgresql.org/docs/10/static/errcodes-appendix.html
case strings.HasPrefix(e.Code, "40"), strings.HasPrefix(e.Code, "08"):
return true
case e.Code == "55P03": // lock_timeout
return true
}
}
return false
}
// DoTempFunc is a simplified version of DoFunc that just returns an error value.
type DoTempFunc func(int) error
// DoTemporaryError will retry as long as the error returned from fn is
// temporary as defined by IsTemporaryError.
func DoTemporaryError(fn func(attempt int) error, opts ...Option) error {
return Do(func(n int) (bool, error) {
err := fn(n)
return IsTemporaryError(err), err
}, opts...)
}
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