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peers.go
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peers.go
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// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package tracker
import (
"context"
"sync"
"github.com/prometheus/client_golang/prometheus"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/validators"
"github.com/ava-labs/avalanchego/utils"
"github.com/ava-labs/avalanchego/utils/crypto/bls"
"github.com/ava-labs/avalanchego/utils/set"
"github.com/ava-labs/avalanchego/version"
)
var (
_ Peers = (*lockedPeers)(nil)
_ Peers = (*meteredPeers)(nil)
_ Peers = (*peerData)(nil)
)
type Peers interface {
validators.SetCallbackListener
validators.Connector
// ConnectedWeight returns the currently connected stake weight
ConnectedWeight() uint64
// ConnectedPercent returns the currently connected stake percentage [0, 1]
ConnectedPercent() float64
// TotalWeight returns the total validator weight
TotalWeight() uint64
// PreferredPeers returns the currently connected validators. If there are
// no currently connected validators then it will return the currently
// connected peers.
PreferredPeers() set.Set[ids.NodeID]
}
type lockedPeers struct {
lock sync.RWMutex
peers Peers
}
func NewPeers() Peers {
return &lockedPeers{
peers: &peerData{
validators: make(map[ids.NodeID]uint64),
},
}
}
func (p *lockedPeers) OnValidatorAdded(nodeID ids.NodeID, pk *bls.PublicKey, txID ids.ID, weight uint64) {
p.lock.Lock()
defer p.lock.Unlock()
p.peers.OnValidatorAdded(nodeID, pk, txID, weight)
}
func (p *lockedPeers) OnValidatorRemoved(nodeID ids.NodeID, weight uint64) {
p.lock.Lock()
defer p.lock.Unlock()
p.peers.OnValidatorRemoved(nodeID, weight)
}
func (p *lockedPeers) OnValidatorWeightChanged(nodeID ids.NodeID, oldWeight, newWeight uint64) {
p.lock.Lock()
defer p.lock.Unlock()
p.peers.OnValidatorWeightChanged(nodeID, oldWeight, newWeight)
}
func (p *lockedPeers) Connected(ctx context.Context, nodeID ids.NodeID, version *version.Application) error {
p.lock.Lock()
defer p.lock.Unlock()
return p.peers.Connected(ctx, nodeID, version)
}
func (p *lockedPeers) Disconnected(ctx context.Context, nodeID ids.NodeID) error {
p.lock.Lock()
defer p.lock.Unlock()
return p.peers.Disconnected(ctx, nodeID)
}
func (p *lockedPeers) ConnectedWeight() uint64 {
p.lock.RLock()
defer p.lock.RUnlock()
return p.peers.ConnectedWeight()
}
func (p *lockedPeers) ConnectedPercent() float64 {
p.lock.RLock()
defer p.lock.RUnlock()
return p.peers.ConnectedPercent()
}
func (p *lockedPeers) TotalWeight() uint64 {
p.lock.RLock()
defer p.lock.RUnlock()
return p.peers.TotalWeight()
}
func (p *lockedPeers) PreferredPeers() set.Set[ids.NodeID] {
p.lock.RLock()
defer p.lock.RUnlock()
return p.peers.PreferredPeers()
}
type meteredPeers struct {
Peers
percentConnected prometheus.Gauge
numValidators prometheus.Gauge
totalWeight prometheus.Gauge
}
func NewMeteredPeers(namespace string, reg prometheus.Registerer) (Peers, error) {
percentConnected := prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Name: "percent_connected",
Help: "Percent of connected stake",
})
totalWeight := prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Name: "total_weight",
Help: "Total stake",
})
numValidators := prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Name: "num_validators",
Help: "Total number of validators",
})
err := utils.Err(
reg.Register(percentConnected),
reg.Register(totalWeight),
reg.Register(numValidators),
)
return &lockedPeers{
peers: &meteredPeers{
Peers: &peerData{
validators: make(map[ids.NodeID]uint64),
},
percentConnected: percentConnected,
totalWeight: totalWeight,
numValidators: numValidators,
},
}, err
}
func (p *meteredPeers) OnValidatorAdded(nodeID ids.NodeID, pk *bls.PublicKey, txID ids.ID, weight uint64) {
p.Peers.OnValidatorAdded(nodeID, pk, txID, weight)
p.numValidators.Inc()
p.totalWeight.Set(float64(p.Peers.TotalWeight()))
p.percentConnected.Set(p.Peers.ConnectedPercent())
}
func (p *meteredPeers) OnValidatorRemoved(nodeID ids.NodeID, weight uint64) {
p.Peers.OnValidatorRemoved(nodeID, weight)
p.numValidators.Dec()
p.totalWeight.Set(float64(p.Peers.TotalWeight()))
p.percentConnected.Set(p.Peers.ConnectedPercent())
}
func (p *meteredPeers) OnValidatorWeightChanged(nodeID ids.NodeID, oldWeight, newWeight uint64) {
p.Peers.OnValidatorWeightChanged(nodeID, oldWeight, newWeight)
p.totalWeight.Set(float64(p.Peers.TotalWeight()))
p.percentConnected.Set(p.Peers.ConnectedPercent())
}
func (p *meteredPeers) Connected(ctx context.Context, nodeID ids.NodeID, version *version.Application) error {
err := p.Peers.Connected(ctx, nodeID, version)
p.percentConnected.Set(p.Peers.ConnectedPercent())
return err
}
func (p *meteredPeers) Disconnected(ctx context.Context, nodeID ids.NodeID) error {
err := p.Peers.Disconnected(ctx, nodeID)
p.percentConnected.Set(p.Peers.ConnectedPercent())
return err
}
type peerData struct {
// validators maps nodeIDs to their current stake weight
validators map[ids.NodeID]uint64
// totalWeight is the total weight of all validators
totalWeight uint64
// connectedWeight contains the sum of all connected validator weights
connectedWeight uint64
// connectedValidators is the set of currently connected peers with a
// non-zero stake weight
connectedValidators set.Set[ids.NodeID]
// connectedPeers is the set of all connected peers
connectedPeers set.Set[ids.NodeID]
}
func (p *peerData) OnValidatorAdded(nodeID ids.NodeID, _ *bls.PublicKey, _ ids.ID, weight uint64) {
p.validators[nodeID] = weight
p.totalWeight += weight
if p.connectedPeers.Contains(nodeID) {
p.connectedWeight += weight
p.connectedValidators.Add(nodeID)
}
}
func (p *peerData) OnValidatorRemoved(nodeID ids.NodeID, weight uint64) {
delete(p.validators, nodeID)
p.totalWeight -= weight
if p.connectedPeers.Contains(nodeID) {
p.connectedWeight -= weight
p.connectedValidators.Remove(nodeID)
}
}
func (p *peerData) OnValidatorWeightChanged(nodeID ids.NodeID, oldWeight, newWeight uint64) {
p.validators[nodeID] = newWeight
p.totalWeight -= oldWeight
p.totalWeight += newWeight
if p.connectedPeers.Contains(nodeID) {
p.connectedWeight -= oldWeight
p.connectedWeight += newWeight
}
}
func (p *peerData) Connected(_ context.Context, nodeID ids.NodeID, _ *version.Application) error {
if weight, ok := p.validators[nodeID]; ok {
p.connectedWeight += weight
p.connectedValidators.Add(nodeID)
}
p.connectedPeers.Add(nodeID)
return nil
}
func (p *peerData) Disconnected(_ context.Context, nodeID ids.NodeID) error {
if weight, ok := p.validators[nodeID]; ok {
p.connectedWeight -= weight
p.connectedValidators.Remove(nodeID)
}
p.connectedPeers.Remove(nodeID)
return nil
}
func (p *peerData) ConnectedWeight() uint64 {
return p.connectedWeight
}
func (p *peerData) ConnectedPercent() float64 {
if p.totalWeight == 0 {
return 1
}
return float64(p.connectedWeight) / float64(p.totalWeight)
}
func (p *peerData) TotalWeight() uint64 {
return p.totalWeight
}
func (p *peerData) PreferredPeers() set.Set[ids.NodeID] {
if p.connectedValidators.Len() == 0 {
connectedPeers := set.NewSet[ids.NodeID](p.connectedPeers.Len())
connectedPeers.Union(p.connectedPeers)
return connectedPeers
}
connectedValidators := set.NewSet[ids.NodeID](p.connectedValidators.Len())
connectedValidators.Union(p.connectedValidators)
return connectedValidators
}