mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-21 12:30:24 +00:00
106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
/*
|
|
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()
|
|
}
|