Official Go implementation of the Ethereum protocol
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go-ethereum/p2p/metrics.go

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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"
)
const (
// ingressMeterName is the prefix of the per-packet inbound metrics.
ingressMeterName = "p2p/ingress"
// egressMeterName is the prefix of the per-packet outbound metrics.
egressMeterName = "p2p/egress"
// HandleHistName is the prefix of the per-packet serving time histograms.
HandleHistName = "p2p/handle"
)
var (
ingressConnectMeter = metrics.NewRegisteredMeter("p2p/serves", nil)
ingressTrafficMeter = metrics.NewRegisteredMeter(ingressMeterName, nil)
egressConnectMeter = metrics.NewRegisteredMeter("p2p/dials", nil)
egressTrafficMeter = metrics.NewRegisteredMeter(egressMeterName, nil)
activePeerGauge = metrics.NewRegisteredGauge("p2p/peers", nil)
)
// meteredConn is a wrapper around a net.Conn that meters both the
// inbound and outbound network traffic.
type meteredConn struct {
net.Conn
}
// newMeteredConn creates a new metered connection, bumps the ingress or egress
// connection meter and also increases the metered peer count. If the metrics
// system is disabled, function returns the original connection.
func newMeteredConn(conn net.Conn, ingress bool, addr *net.TCPAddr) net.Conn {
// Short circuit if metrics are disabled
if !metrics.Enabled {
return conn
}
// Bump the connection counters and wrap the connection
if ingress {
ingressConnectMeter.Mark(1)
} else {
egressConnectMeter.Mark(1)
}
activePeerGauge.Inc(1)
return &meteredConn{Conn: conn}
}
// Read delegates a network read to the underlying connection, bumping the common
// and the peer ingress traffic meters along the way.
func (c *meteredConn) Read(b []byte) (n int, err error) {
n, err = c.Conn.Read(b)
ingressTrafficMeter.Mark(int64(n))
return n, err
}
// Write delegates a network write to the underlying connection, bumping the common
// and the peer egress traffic meters along the way.
func (c *meteredConn) Write(b []byte) (n int, err error) {
n, err = c.Conn.Write(b)
egressTrafficMeter.Mark(int64(n))
return n, err
}
// Close delegates a close operation to the underlying connection, unregisters
// the peer from the traffic registries and emits close event.
func (c *meteredConn) Close() error {
err := c.Conn.Close()
if err == nil {
activePeerGauge.Dec(1)
}
return err
}