# HG changeset patch
# User Matthew Wild <mwild1@gmail.com>
# Date 1436365542 -3600
# Node ID b38db4b634d3ba911ca7a304a27ac4261aaedc42
# Parent  0cbb09afa5c307bfb07a1eb30be8ff661b9b96af
util.sql: Add safety check to ensure our chosen connection charset is actually being used (MySQL)

diff -r 0cbb09afa5c3 -r b38db4b634d3 util/sql.lua
--- a/util/sql.lua	Wed Jul 08 15:16:17 2015 +0100
+++ b/util/sql.lua	Wed Jul 08 15:25:42 2015 +0100
@@ -286,6 +286,18 @@
 		return ok, err;
 	end
 	
+	if driver == "MySQL" then
+		local ok, actual_charset = self:transaction(function ()
+			return self:select"SHOW SESSION VARIABLES LIKE 'character_set_client'";
+		end);
+		for row in actual_charset do
+			if row[2] ~= charset then
+				log("error", "MySQL %s is actually %q (expected %q)", row[1], row[2], charset);
+				return false, "Failed to set connection encoding";
+			end
+		end
+	end
+	
 	return true;
 end
 local engine_mt = { __index = engine };