Move http package inside cmd (#5776)

cmd/http/conn_bug_21133.go

@@ -0,0 +1,48 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package http
+
+import (
+	"net"
+	"sync/atomic"
+	"time"
+)
+
+// QuirkConn - similar to golang net.Conn struct, but contains a workaround of the
+// following the go bug reported here https://github.com/golang/go/issues/21133.
+// Once the bug will be fixed, we can remove this structure and replaces it with
+// the standard net.Conn
+type QuirkConn struct {
+	net.Conn
+	hadReadDeadlineInPast int32 // atomic
+}
+
+// SetReadDeadline - implements a workaround of SetReadDeadline go bug
+func (q *QuirkConn) SetReadDeadline(t time.Time) error {
+	inPast := int32(0)
+	if t.Before(time.Now()) {
+		inPast = 1
+	}
+	atomic.StoreInt32(&q.hadReadDeadlineInPast, inPast)
+	return q.Conn.SetReadDeadline(t)
+}
+
+// canSetReadDeadline - returns if it is safe to set a new
+// read deadline without triggering golang/go#21133 issue.
+func (q *QuirkConn) canSetReadDeadline() bool {
+	return atomic.LoadInt32(&q.hadReadDeadlineInPast) != 1
+}