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counting_listener.go
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/
counting_listener.go
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// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proc
import (
"net"
"github.com/youtube/vitess/go/stats"
)
type CountingListener struct {
net.Listener
ConnCount, ConnAccept *stats.Int
}
type countingConnection struct {
net.Conn
listener *CountingListener
}
// Published creates a wrapper for net.Listener that
// publishes connection stats.
func Published(l net.Listener, countTag, acceptTag string) net.Listener {
return &CountingListener{
Listener: l,
ConnCount: stats.NewInt(countTag),
ConnAccept: stats.NewInt(acceptTag),
}
}
// Accept increments stats counters before returning
// a connection.
func (l *CountingListener) Accept() (c net.Conn, err error) {
conn, err := l.Listener.Accept()
if err != nil {
return nil, err
}
l.ConnCount.Add(1)
l.ConnAccept.Add(1)
return &countingConnection{conn, l}, nil
}
// Close decrements the stats counter and
// closes the connection.
func (c *countingConnection) Close() error {
if c.listener != nil {
c.listener.ConnCount.Add(-1)
c.listener = nil
}
return c.Conn.Close()
}