path: root/p2p/metrics.go

// 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.NewMeter("p2p/InboundConnects")
    ingressTrafficMeter = metrics.NewMeter("p2p/InboundTraffic")
    egressConnectMeter  = metrics.NewMeter("p2p/OutboundConnects")
    egressTrafficMeter  = metrics.NewMeter("p2p/OutboundTraffic")
)

// 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
}