package redis import ( "context" "io" "net" "strings" "github.com/go-redis/redis/v7/internal/proto" ) func isRetryableError(err error, retryTimeout bool) bool { switch err { case nil, context.Canceled, context.DeadlineExceeded: return false case io.EOF: return true } if netErr, ok := err.(net.Error); ok { if netErr.Timeout() { return retryTimeout } return true } s := err.Error() if s == "ERR max number of clients reached" { return true } if strings.HasPrefix(s, "LOADING ") { return true } if strings.HasPrefix(s, "READONLY ") { return true } if strings.HasPrefix(s, "CLUSTERDOWN ") { return true } return false } func isRedisError(err error) bool { _, ok := err.(proto.RedisError) return ok } func isBadConn(err error, allowTimeout bool) bool { if err == nil { return false } if isRedisError(err) { // Close connections in read only state in case domain addr is used // and domain resolves to a different Redis Server. See #790. return isReadOnlyError(err) } if allowTimeout { if netErr, ok := err.(net.Error); ok && netErr.Timeout() { return false } } return true } func isMovedError(err error) (moved bool, ask bool, addr string) { if !isRedisError(err) { return } s := err.Error() switch { case strings.HasPrefix(s, "MOVED "): moved = true case strings.HasPrefix(s, "ASK "): ask = true default: return } ind := strings.LastIndex(s, " ") if ind == -1 { return false, false, "" } addr = s[ind+1:] return } func isLoadingError(err error) bool { return strings.HasPrefix(err.Error(), "LOADING ") } func isReadOnlyError(err error) bool { return strings.HasPrefix(err.Error(), "READONLY ") }