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239 lines
8.2 KiB
Go
239 lines
8.2 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Contains the meters and timers used by the networking layer.
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package p2p
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import (
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"fmt"
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"net"
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"sync"
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"sync/atomic"
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"time"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/ethereum/go-ethereum/p2p/enode"
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)
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const (
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MetricsInboundTraffic = "p2p/ingress" // Name for the registered inbound traffic meter
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MetricsOutboundTraffic = "p2p/egress" // Name for the registered outbound traffic meter
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MetricsOutboundConnects = "p2p/dials" // Name for the registered outbound connects meter
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MetricsInboundConnects = "p2p/serves" // Name for the registered inbound connects meter
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MeteredPeerLimit = 1024 // This amount of peers are individually metered
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)
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var (
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ingressConnectMeter = metrics.NewRegisteredMeter(MetricsInboundConnects, nil) // Meter counting the ingress connections
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ingressTrafficMeter = metrics.NewRegisteredMeter(MetricsInboundTraffic, nil) // Meter metering the cumulative ingress traffic
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egressConnectMeter = metrics.NewRegisteredMeter(MetricsOutboundConnects, nil) // Meter counting the egress connections
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egressTrafficMeter = metrics.NewRegisteredMeter(MetricsOutboundTraffic, nil) // Meter metering the cumulative egress traffic
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activePeerGauge = metrics.NewRegisteredGauge("p2p/peers", nil) // Gauge tracking the current peer count
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PeerIngressRegistry = metrics.NewPrefixedChildRegistry(metrics.EphemeralRegistry, MetricsInboundTraffic+"/") // Registry containing the peer ingress
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PeerEgressRegistry = metrics.NewPrefixedChildRegistry(metrics.EphemeralRegistry, MetricsOutboundTraffic+"/") // Registry containing the peer egress
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meteredPeerFeed event.Feed // Event feed for peer metrics
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meteredPeerCount int32 // Actually stored peer connection count
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)
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// MeteredPeerEventType is the type of peer events emitted by a metered connection.
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type MeteredPeerEventType int
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const (
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// PeerConnected is the type of event emitted when a peer successfully
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// made the handshake.
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PeerConnected MeteredPeerEventType = iota
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// PeerDisconnected is the type of event emitted when a peer disconnects.
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PeerDisconnected
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// PeerHandshakeFailed is the type of event emitted when a peer fails to
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// make the handshake or disconnects before the handshake.
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PeerHandshakeFailed
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)
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// MeteredPeerEvent is an event emitted when peers connect or disconnect.
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type MeteredPeerEvent struct {
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Type MeteredPeerEventType // Type of peer event
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IP net.IP // IP address of the peer
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ID enode.ID // NodeID of the peer
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Elapsed time.Duration // Time elapsed between the connection and the handshake/disconnection
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Ingress uint64 // Ingress count at the moment of the event
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Egress uint64 // Egress count at the moment of the event
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}
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// SubscribeMeteredPeerEvent registers a subscription for peer life-cycle events
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// if metrics collection is enabled.
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func SubscribeMeteredPeerEvent(ch chan<- MeteredPeerEvent) event.Subscription {
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return meteredPeerFeed.Subscribe(ch)
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}
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// meteredConn is a wrapper around a net.Conn that meters both the
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// inbound and outbound network traffic.
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type meteredConn struct {
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net.Conn // Network connection to wrap with metering
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connected time.Time // Connection time of the peer
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ip net.IP // IP address of the peer
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id enode.ID // NodeID of the peer
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// trafficMetered denotes if the peer is registered in the traffic registries.
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// Its value is true if the metered peer count doesn't reach the limit in the
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// moment of the peer's connection.
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trafficMetered bool
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ingressMeter metrics.Meter // Meter for the read bytes of the peer
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egressMeter metrics.Meter // Meter for the written bytes of the peer
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lock sync.RWMutex // Lock protecting the metered connection's internals
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}
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// newMeteredConn creates a new metered connection, bumps the ingress or egress
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// connection meter and also increases the metered peer count. If the metrics
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// system is disabled or the IP address is unspecified, this function returns
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// the original object.
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func newMeteredConn(conn net.Conn, ingress bool, ip net.IP) net.Conn {
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// Short circuit if metrics are disabled
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if !metrics.Enabled {
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return conn
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}
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if ip.IsUnspecified() {
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log.Warn("Peer IP is unspecified")
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return conn
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}
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// Bump the connection counters and wrap the connection
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if ingress {
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ingressConnectMeter.Mark(1)
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} else {
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egressConnectMeter.Mark(1)
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}
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activePeerGauge.Inc(1)
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return &meteredConn{
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Conn: conn,
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ip: ip,
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connected: time.Now(),
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}
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}
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// Read delegates a network read to the underlying connection, bumping the common
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// and the peer ingress traffic meters along the way.
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func (c *meteredConn) Read(b []byte) (n int, err error) {
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n, err = c.Conn.Read(b)
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ingressTrafficMeter.Mark(int64(n))
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c.lock.RLock()
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if c.trafficMetered {
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c.ingressMeter.Mark(int64(n))
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}
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c.lock.RUnlock()
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return n, err
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}
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// Write delegates a network write to the underlying connection, bumping the common
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// and the peer egress traffic meters along the way.
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func (c *meteredConn) Write(b []byte) (n int, err error) {
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n, err = c.Conn.Write(b)
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egressTrafficMeter.Mark(int64(n))
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c.lock.RLock()
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if c.trafficMetered {
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c.egressMeter.Mark(int64(n))
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}
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c.lock.RUnlock()
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return n, err
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}
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// handshakeDone is called when a peer handshake is done. Registers the peer to
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// the ingress and the egress traffic registries using the peer's IP and node ID,
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// also emits connect event.
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func (c *meteredConn) handshakeDone(id enode.ID) {
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// TODO (kurkomisi): use the node URL instead of the pure node ID. (the String() method of *Node)
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if atomic.AddInt32(&meteredPeerCount, 1) >= MeteredPeerLimit {
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// Don't register the peer in the traffic registries.
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atomic.AddInt32(&meteredPeerCount, -1)
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c.lock.Lock()
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c.id, c.trafficMetered = id, false
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c.lock.Unlock()
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log.Warn("Metered peer count reached the limit")
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} else {
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key := fmt.Sprintf("%s/%s", c.ip, id.String())
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c.lock.Lock()
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c.id, c.trafficMetered = id, true
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c.ingressMeter = metrics.NewRegisteredMeter(key, PeerIngressRegistry)
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c.egressMeter = metrics.NewRegisteredMeter(key, PeerEgressRegistry)
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c.lock.Unlock()
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}
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meteredPeerFeed.Send(MeteredPeerEvent{
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Type: PeerConnected,
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IP: c.ip,
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ID: id,
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Elapsed: time.Since(c.connected),
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})
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}
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// Close delegates a close operation to the underlying connection, unregisters
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// the peer from the traffic registries and emits close event.
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func (c *meteredConn) Close() error {
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err := c.Conn.Close()
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c.lock.RLock()
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if c.id == (enode.ID{}) {
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// If the peer disconnects before the handshake.
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c.lock.RUnlock()
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meteredPeerFeed.Send(MeteredPeerEvent{
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Type: PeerHandshakeFailed,
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IP: c.ip,
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Elapsed: time.Since(c.connected),
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})
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activePeerGauge.Dec(1)
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return err
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}
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id := c.id
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if !c.trafficMetered {
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// If the peer isn't registered in the traffic registries.
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c.lock.RUnlock()
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meteredPeerFeed.Send(MeteredPeerEvent{
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Type: PeerDisconnected,
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IP: c.ip,
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ID: id,
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})
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activePeerGauge.Dec(1)
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return err
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}
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ingress, egress := uint64(c.ingressMeter.Count()), uint64(c.egressMeter.Count())
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c.lock.RUnlock()
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// Decrement the metered peer count
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atomic.AddInt32(&meteredPeerCount, -1)
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// Unregister the peer from the traffic registries
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key := fmt.Sprintf("%s/%s", c.ip, id)
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PeerIngressRegistry.Unregister(key)
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PeerEgressRegistry.Unregister(key)
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meteredPeerFeed.Send(MeteredPeerEvent{
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Type: PeerDisconnected,
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IP: c.ip,
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ID: id,
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Ingress: ingress,
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Egress: egress,
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})
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activePeerGauge.Dec(1)
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return err
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}
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