close bad connection to solve CLOSE_WAIT stuck

wmin0 · wmin0 · commit d6b89069109a · 2018-03-15T11:11:16.000+08:00
diff --git a/error.go b/error.go
@@ -506,4 +506,8 @@ func (c *conn) errRecover(err *error) {
 	if *err == driver.ErrBadConn {
 		c.bad = true
 	}
+
+	if c.bad && c.c != nil {
+		c.c.Close()
+	}
 }

Original file line number	Diff line number	Diff line change
`@@ -506,4 +506,8 @@ func (c conn) errRecover(err error) {`
`506`	`506`	`if *err == driver.ErrBadConn {`
`507`	`507`	`c.bad = true`
`508`	`508`	`}`
	`509`	`+`
	`510`	`+ if c.bad && c.c != nil {`
	`511`	`+ c.c.Close()`
	`512`	`+ }`
`509`	`513`	`}`