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| 1 | +// Copyright 2023 The go-ethereum Authors |
| 2 | +// This file is part of the go-ethereum library. |
| 3 | +// |
| 4 | +// The go-ethereum library is free software: you can redistribute it and/or modify |
| 5 | +// it under the terms of the GNU Lesser General Public License as published by |
| 6 | +// the Free Software Foundation, either version 3 of the License, or |
| 7 | +// (at your option) any later version. |
| 8 | +// |
| 9 | +// The go-ethereum library is distributed in the hope that it will be useful, |
| 10 | +// but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | +// GNU Lesser General Public License for more details. |
| 13 | +// |
| 14 | +// You should have received a copy of the GNU Lesser General Public License |
| 15 | +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. |
| 16 | + |
| 17 | +package discover |
| 18 | + |
| 19 | +import ( |
| 20 | + "net" |
| 21 | + |
| 22 | + "github.com/ethereum/go-ethereum/metrics" |
| 23 | +) |
| 24 | + |
| 25 | +const ( |
| 26 | + moduleName = "discover" |
| 27 | + // ingressMeterName is the prefix of the per-packet inbound metrics. |
| 28 | + ingressMeterName = moduleName + "/ingress" |
| 29 | + |
| 30 | + // egressMeterName is the prefix of the per-packet outbound metrics. |
| 31 | + egressMeterName = moduleName + "/egress" |
| 32 | +) |
| 33 | + |
| 34 | +var ( |
| 35 | + ingressTrafficMeter = metrics.NewRegisteredMeter(ingressMeterName, nil) |
| 36 | + egressTrafficMeter = metrics.NewRegisteredMeter(egressMeterName, nil) |
| 37 | +) |
| 38 | + |
| 39 | +// meteredConn is a wrapper around a net.UDPConn that meters both the |
| 40 | +// inbound and outbound network traffic. |
| 41 | +type meteredUdpConn struct { |
| 42 | + UDPConn |
| 43 | +} |
| 44 | + |
| 45 | +func newMeteredConn(conn UDPConn) UDPConn { |
| 46 | + // Short circuit if metrics are disabled |
| 47 | + if !metrics.Enabled { |
| 48 | + return conn |
| 49 | + } |
| 50 | + return &meteredUdpConn{UDPConn: conn} |
| 51 | +} |
| 52 | + |
| 53 | +// Read delegates a network read to the underlying connection, bumping the udp ingress traffic meter along the way. |
| 54 | +func (c *meteredUdpConn) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) { |
| 55 | + n, addr, err = c.UDPConn.ReadFromUDP(b) |
| 56 | + ingressTrafficMeter.Mark(int64(n)) |
| 57 | + return n, addr, err |
| 58 | +} |
| 59 | + |
| 60 | +// Write delegates a network write to the underlying connection, bumping the udp egress traffic meter along the way. |
| 61 | +func (c *meteredUdpConn) WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error) { |
| 62 | + n, err = c.UDPConn.WriteToUDP(b, addr) |
| 63 | + egressTrafficMeter.Mark(int64(n)) |
| 64 | + return n, err |
| 65 | +} |
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