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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Contains the meters and timers used by the networking layer.
package p2p
import (
"net"
"github.com/ethereum/go-ethereum/metrics"
)
var (
ingressConnectMeter = metrics.NewRegisteredMeter("p2p/InboundConnects", nil)
ingressTrafficMeter = metrics.NewRegisteredMeter("p2p/InboundTraffic", nil)
egressConnectMeter = metrics.NewRegisteredMeter("p2p/OutboundConnects", nil)
egressTrafficMeter = metrics.NewRegisteredMeter("p2p/OutboundTraffic", nil)
)
// meteredConn is a wrapper around a network TCP connection that meters both the
// inbound and outbound network traffic.
type meteredConn struct {
*net.TCPConn // Network connection to wrap with metering
}
// newMeteredConn creates a new metered connection, also bumping the ingress or
// egress connection meter. If the metrics system is disabled, this function
// returns the original object.
func newMeteredConn(conn net.Conn, ingress bool) net.Conn {
// Short circuit if metrics are disabled
if !metrics.Enabled {
return conn
}
// Otherwise bump the connection counters and wrap the connection
if ingress {
ingressConnectMeter.Mark(1)
} else {
egressConnectMeter.Mark(1)
}
return &meteredConn{conn.(*net.TCPConn)}
}
// Read delegates a network read to the underlying connection, bumping the ingress
// traffic meter along the way.
func (c *meteredConn) Read(b []byte) (n int, err error) {
n, err = c.TCPConn.Read(b)
ingressTrafficMeter.Mark(int64(n))
return
}
// Write delegates a network write to the underlying connection, bumping the
// egress traffic meter along the way.
func (c *meteredConn) Write(b []byte) (n int, err error) {
n, err = c.TCPConn.Write(b)
egressTrafficMeter.Mark(int64(n))
return
}
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