You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
218 lines
5.4 KiB
218 lines
5.4 KiB
package monitor
|
|
|
|
import (
|
|
"fmt"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"github.com/go-kit/kit/log"
|
|
"github.com/pkg/errors"
|
|
tmtypes "github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
// waiting more than this many seconds for a block means we're unhealthy
|
|
const nodeLivenessTimeout = 5 * time.Second
|
|
|
|
// Monitor keeps track of the nodes and updates common statistics upon
|
|
// receiving new events from nodes.
|
|
//
|
|
// Common statistics is stored in Network struct.
|
|
type Monitor struct {
|
|
Nodes []*Node
|
|
Network *Network
|
|
|
|
monitorQuit chan struct{} // monitor exitting
|
|
nodeQuit map[string]chan struct{} // node is being stopped and removed from under the monitor
|
|
|
|
recalculateNetworkUptimeEvery time.Duration
|
|
numValidatorsUpdateInterval time.Duration
|
|
|
|
logger log.Logger
|
|
}
|
|
|
|
// NewMonitor creates new instance of a Monitor. You can provide options to
|
|
// change some default values.
|
|
//
|
|
// Example:
|
|
// NewMonitor(monitor.SetNumValidatorsUpdateInterval(1 * time.Second))
|
|
func NewMonitor(options ...func(*Monitor)) *Monitor {
|
|
m := &Monitor{
|
|
Nodes: make([]*Node, 0),
|
|
Network: NewNetwork(),
|
|
monitorQuit: make(chan struct{}),
|
|
nodeQuit: make(map[string]chan struct{}),
|
|
recalculateNetworkUptimeEvery: 10 * time.Second,
|
|
numValidatorsUpdateInterval: 5 * time.Second,
|
|
logger: log.NewNopLogger(),
|
|
}
|
|
|
|
for _, option := range options {
|
|
option(m)
|
|
}
|
|
|
|
return m
|
|
}
|
|
|
|
// RecalculateNetworkUptimeEvery lets you change network uptime update interval.
|
|
func RecalculateNetworkUptimeEvery(d time.Duration) func(m *Monitor) {
|
|
return func(m *Monitor) {
|
|
m.recalculateNetworkUptimeEvery = d
|
|
}
|
|
}
|
|
|
|
// SetNumValidatorsUpdateInterval lets you change num validators update interval.
|
|
func SetNumValidatorsUpdateInterval(d time.Duration) func(m *Monitor) {
|
|
return func(m *Monitor) {
|
|
m.numValidatorsUpdateInterval = d
|
|
}
|
|
}
|
|
|
|
// SetLogger lets you set your own logger
|
|
func (m *Monitor) SetLogger(l log.Logger) {
|
|
m.logger = l
|
|
}
|
|
|
|
// Monitor begins to monitor the node `n`. The node will be started and added
|
|
// to the monitor.
|
|
func (m *Monitor) Monitor(n *Node) error {
|
|
m.Nodes = append(m.Nodes, n)
|
|
|
|
blockCh := make(chan tmtypes.Header, 10)
|
|
n.SendBlocksTo(blockCh)
|
|
blockLatencyCh := make(chan float64, 10)
|
|
n.SendBlockLatenciesTo(blockLatencyCh)
|
|
disconnectCh := make(chan bool, 10)
|
|
n.NotifyAboutDisconnects(disconnectCh)
|
|
|
|
if err := n.Start(); err != nil {
|
|
return err
|
|
}
|
|
|
|
m.Network.NewNode(n.Name)
|
|
|
|
m.nodeQuit[n.Name] = make(chan struct{})
|
|
go m.listen(n.Name, blockCh, blockLatencyCh, disconnectCh, m.nodeQuit[n.Name])
|
|
|
|
return nil
|
|
}
|
|
|
|
// Unmonitor stops monitoring node `n`. The node will be stopped and removed
|
|
// from the monitor.
|
|
func (m *Monitor) Unmonitor(n *Node) {
|
|
m.Network.NodeDeleted(n.Name)
|
|
|
|
n.Stop()
|
|
close(m.nodeQuit[n.Name])
|
|
delete(m.nodeQuit, n.Name)
|
|
i, _ := m.NodeByName(n.Name)
|
|
m.Nodes[i] = m.Nodes[len(m.Nodes)-1]
|
|
m.Nodes = m.Nodes[:len(m.Nodes)-1]
|
|
}
|
|
|
|
// NodeByName returns the node and its index if such node exists within the
|
|
// monitor. Otherwise, -1 and nil are returned.
|
|
func (m *Monitor) NodeByName(name string) (index int, node *Node) {
|
|
for i, n := range m.Nodes {
|
|
if name == n.Name {
|
|
return i, n
|
|
}
|
|
}
|
|
return -1, nil
|
|
}
|
|
|
|
// Start starts the monitor's routines: recalculating network uptime and
|
|
// updating number of validators.
|
|
func (m *Monitor) Start() error {
|
|
go m.recalculateNetworkUptimeLoop()
|
|
go m.updateNumValidatorLoop()
|
|
|
|
return nil
|
|
}
|
|
|
|
// Stop stops the monitor's routines.
|
|
func (m *Monitor) Stop() {
|
|
close(m.monitorQuit)
|
|
|
|
for _, n := range m.Nodes {
|
|
m.Unmonitor(n)
|
|
}
|
|
}
|
|
|
|
// main loop where we listen for events from the node
|
|
func (m *Monitor) listen(nodeName string, blockCh <-chan tmtypes.Header, blockLatencyCh <-chan float64, disconnectCh <-chan bool, quit <-chan struct{}) {
|
|
logger := log.With(m.logger, "node", nodeName)
|
|
|
|
for {
|
|
select {
|
|
case <-quit:
|
|
return
|
|
case b := <-blockCh:
|
|
m.Network.NewBlock(b)
|
|
m.Network.NodeIsOnline(nodeName)
|
|
case l := <-blockLatencyCh:
|
|
m.Network.NewBlockLatency(l)
|
|
m.Network.NodeIsOnline(nodeName)
|
|
case disconnected := <-disconnectCh:
|
|
if disconnected {
|
|
m.Network.NodeIsDown(nodeName)
|
|
} else {
|
|
m.Network.NodeIsOnline(nodeName)
|
|
}
|
|
case <-time.After(nodeLivenessTimeout):
|
|
logger.Log("event", fmt.Sprintf("node was not responding for %v", nodeLivenessTimeout))
|
|
m.Network.NodeIsDown(nodeName)
|
|
}
|
|
}
|
|
}
|
|
|
|
// recalculateNetworkUptimeLoop every N seconds.
|
|
func (m *Monitor) recalculateNetworkUptimeLoop() {
|
|
for {
|
|
select {
|
|
case <-m.monitorQuit:
|
|
return
|
|
case <-time.After(m.recalculateNetworkUptimeEvery):
|
|
m.Network.RecalculateUptime()
|
|
}
|
|
}
|
|
}
|
|
|
|
// updateNumValidatorLoop sends a request to a random node once every N seconds,
|
|
// which in turn makes an RPC call to get the latest validators.
|
|
func (m *Monitor) updateNumValidatorLoop() {
|
|
rand.Seed(time.Now().Unix())
|
|
|
|
var height uint64
|
|
var num int
|
|
var err error
|
|
|
|
for {
|
|
if 0 == len(m.Nodes) {
|
|
time.Sleep(m.numValidatorsUpdateInterval)
|
|
continue
|
|
}
|
|
|
|
randomNodeIndex := rand.Intn(len(m.Nodes))
|
|
|
|
select {
|
|
case <-m.monitorQuit:
|
|
return
|
|
case <-time.After(m.numValidatorsUpdateInterval):
|
|
i := 0
|
|
for _, n := range m.Nodes {
|
|
if i == randomNodeIndex {
|
|
height, num, err = n.NumValidators()
|
|
if err != nil {
|
|
m.logger.Log("err", errors.Wrap(err, "update num validators failed"))
|
|
}
|
|
break
|
|
}
|
|
i++
|
|
}
|
|
|
|
if m.Network.Height <= height {
|
|
m.Network.NumValidators = num
|
|
}
|
|
}
|
|
}
|
|
}
|