Dependencies for the affinity router and the
affinity routing daemon.
Change-Id: Icda72c3594ef7f8f0bc0c33dc03087a4c25529ca
diff --git a/vendor/k8s.io/client-go/util/connrotation/connrotation.go b/vendor/k8s.io/client-go/util/connrotation/connrotation.go
new file mode 100644
index 0000000..235a9e0
--- /dev/null
+++ b/vendor/k8s.io/client-go/util/connrotation/connrotation.go
@@ -0,0 +1,105 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+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 connrotation implements a connection dialer that tracks and can close
+// all created connections.
+//
+// This is used for credential rotation of long-lived connections, when there's
+// no way to re-authenticate on a live connection.
+package connrotation
+
+import (
+ "context"
+ "net"
+ "sync"
+)
+
+// DialFunc is a shorthand for signature of net.DialContext.
+type DialFunc func(ctx context.Context, network, address string) (net.Conn, error)
+
+// Dialer opens connections through Dial and tracks them.
+type Dialer struct {
+ dial DialFunc
+
+ mu sync.Mutex
+ conns map[*closableConn]struct{}
+}
+
+// NewDialer creates a new Dialer instance.
+//
+// If dial is not nil, it will be used to create new underlying connections.
+// Otherwise net.DialContext is used.
+func NewDialer(dial DialFunc) *Dialer {
+ return &Dialer{
+ dial: dial,
+ conns: make(map[*closableConn]struct{}),
+ }
+}
+
+// CloseAll forcibly closes all tracked connections.
+//
+// Note: new connections may get created before CloseAll returns.
+func (d *Dialer) CloseAll() {
+ d.mu.Lock()
+ conns := d.conns
+ d.conns = make(map[*closableConn]struct{})
+ d.mu.Unlock()
+
+ for conn := range conns {
+ conn.Close()
+ }
+}
+
+// Dial creates a new tracked connection.
+func (d *Dialer) Dial(network, address string) (net.Conn, error) {
+ return d.DialContext(context.Background(), network, address)
+}
+
+// DialContext creates a new tracked connection.
+func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
+ conn, err := d.dial(ctx, network, address)
+ if err != nil {
+ return nil, err
+ }
+
+ closable := &closableConn{Conn: conn}
+
+ // Start tracking the connection
+ d.mu.Lock()
+ d.conns[closable] = struct{}{}
+ d.mu.Unlock()
+
+ // When the connection is closed, remove it from the map. This will
+ // be no-op if the connection isn't in the map, e.g. if CloseAll()
+ // is called.
+ closable.onClose = func() {
+ d.mu.Lock()
+ delete(d.conns, closable)
+ d.mu.Unlock()
+ }
+
+ return closable, nil
+}
+
+type closableConn struct {
+ onClose func()
+ net.Conn
+}
+
+func (c *closableConn) Close() error {
+ go c.onClose()
+ return c.Conn.Close()
+}