From 13b11e46a4e2fac36f86b697b8bed9fab65cca58 Mon Sep 17 00:00:00 2001
From: Quentin Machu <me@quentin-machu.fr>
Date: Wed, 26 Aug 2015 02:10:27 -0400
Subject: [PATCH] Make the SQL connection fail-fast

---
 graph/sql/quadstore.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/graph/sql/quadstore.go b/graph/sql/quadstore.go
index 65b25fe..d7f3a87 100644
--- a/graph/sql/quadstore.go
+++ b/graph/sql/quadstore.go
@@ -44,6 +44,13 @@ func connectSQLTables(addr string, _ graph.Options) (*sql.DB, error) {
 		glog.Errorf("Couldn't open database at %s: %#v", addr, err)
 		return nil, err
 	}
+	// "Open may just validate its arguments without creating a connection to the database."
+	// "To verify that the data source name is valid, call Ping."
+	// Source: http://golang.org/pkg/database/sql/#Open
+	if err := conn.Ping(); err != nil {
+		glog.Errorf("Couldn't open database at %s: %#v", addr, err)
+		return nil, err
+	}
 	return conn, nil
 }