feat (add): panic error handling (#491)

* closes #487

internal/errors/errors.go

@@ -256,6 +256,21 @@ func IsRedisCommandError(err error) bool {
 	return As(err, &target)
 }
 
+// PanicError defines an error when occurred a panic error.
+type PanicError struct {
+	ErrMsg string
+}
+
+func (e *PanicError) Error() string {
+	return fmt.Sprintf("panic error cause by: %s", e.ErrMsg)
+}
+
+// IsPanicError reports whether any error in err's chain is of type PanicError.
+func IsPanicError(err error) bool {
+	var target *PanicError
+	return As(err, &target)
+}
+
 /*************************************************
     Standard Library errors package functions
 *************************************************/

internal/errors/errors_test.go

@@ -131,6 +131,12 @@ func TestErrorPredicates(t *testing.T) {
 			err:  E(Op("rdb.ArchiveTask"), NotFound, &QueueNotFoundError{Queue: "default"}),
 			want: true,
 		},
+		{
+			desc: "IsPanicError should detect presence of PanicError in err's chain",
+			fn:   IsPanicError,
+			err:  E(Op("unknown"), Unknown, &PanicError{ErrMsg: "Something went wrong"}),
+			want: true,
+		},
 	}
 
 	for _, tc := range tests {