From 916f3d789b6afaf7bfe161aeec391c8a35e354a8 Mon Sep 17 00:00:00 2001
From: Jae Kwon <jae@tendermint.com>
Date: Fri, 28 Oct 2016 14:50:46 -0700
Subject: [PATCH] Size() returns 0 if file doesn't exist

---
 autofile.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/autofile.go b/autofile.go
index ed9d549b..36de9984 100644
--- a/autofile.go
+++ b/autofile.go
@@ -107,6 +107,16 @@ func (af *AutoFile) openFile() error {
 func (af *AutoFile) Size() (int64, error) {
 	af.mtx.Lock()
 	defer af.mtx.Unlock()
+	if af.file == nil {
+		err := af.openFile()
+		if err != nil {
+			if err == os.ErrNotExist {
+				return 0, nil
+			} else {
+				return -1, err
+			}
+		}
+	}
 	stat, err := af.file.Stat()
 	if err != nil {
 		return -1, err