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