*: Collect height and state data from chain

Closes #95.

Signed-off-by: Evgenii Baidakov <[email protected]>

cmd/neofs-net-monitor/monitor.go

@@ -10,6 +10,7 @@ import (
 	"github.com/nspcc-dev/neofs-net-monitor/pkg/monitor"
 	"github.com/nspcc-dev/neofs-net-monitor/pkg/morphchain"
 	"github.com/nspcc-dev/neofs-net-monitor/pkg/morphchain/contracts"
+	"github.com/nspcc-dev/neofs-net-monitor/pkg/multinodepool"
 	"github.com/nspcc-dev/neofs-net-monitor/pkg/pool"
 	"github.com/spf13/viper"
 	"go.uber.org/zap"
@@ -130,6 +131,11 @@ func New(ctx context.Context, cfg *viper.Viper) (*monitor.Monitor, error) {
 		},
 	)
 
+	mnPool := multinodepool.NewPool(sideChainEndpoints, cfg.GetDuration(cfgMetricsInterval))
+	if err = mnPool.Dial(ctx); err != nil {
+		return nil, fmt.Errorf("multinodepool: %w", err)
+	}
+
 	return monitor.New(monitor.Args{
 		Balance:        balance,
 		Proxy:          proxy,
@@ -144,5 +150,7 @@ func New(ctx context.Context, cfg *viper.Viper) (*monitor.Monitor, error) {
 		SideBlFetcher:  sideBalanceFetcher,
 		MainBlFetcher:  mainBalanceFetcher,
 		CnrFetcher:     cnrFetcher,
+		HeightFetcher:  mnPool,
+		StateFetcher:   mnPool,
 	}), nil
 }

pkg/monitor/metrics.go

@@ -167,4 +167,26 @@ var (
 			Help:      "Number of available containers",
 		},
 	)
+
+	chainHeight = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Subsystem: "neofs_net_monitor",
+			Name:      "chain_height",
+			Help:      "Chain height in blocks",
+		},
+		[]string{
+			"host",
+		},
+	)
+
+	chainState = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Subsystem: "neofs_net_monitor",
+			Name:      "chain_state",
+			Help:      "Chain state hash in specific height",
+		},
+		[]string{
+			"host", "hash",
+		},
+	)
 )

pkg/monitor/monitor.go

@@ -44,6 +44,24 @@ type (
 		Total() (int64, error)
 	}
 
+	HeightFetcher interface {
+		FetchHeight() []HeightData
+	}
+
+	StateFetcher interface {
+		FetchState(height uint32) []StateData
+	}
+
+	HeightData struct {
+		Host  string
+		Value uint32
+	}
+
+	StateData struct {
+		Host  string
+		Value string
+	}
+
 	Node struct {
 		ID         uint64
 		Address    string
@@ -76,6 +94,8 @@ type (
 		sideBlFetcher BalanceFetcher
 		mainBlFetcher BalanceFetcher
 		cnrFetcher    ContainerFetcher
+		heightFetcher HeightFetcher
+		stateFetcher  StateFetcher
 	}
 
 	Args struct {
@@ -92,6 +112,8 @@ type (
 		SideBlFetcher  BalanceFetcher
 		MainBlFetcher  BalanceFetcher
 		CnrFetcher     ContainerFetcher
+		HeightFetcher  HeightFetcher
+		StateFetcher   StateFetcher
 	}
 )
 
@@ -113,6 +135,8 @@ func New(p Args) *Monitor {
 		sideBlFetcher: p.SideBlFetcher,
 		mainBlFetcher: p.MainBlFetcher,
 		cnrFetcher:    p.CnrFetcher,
+		heightFetcher: p.HeightFetcher,
+		stateFetcher:  p.StateFetcher,
 	}
 }
 
@@ -133,6 +157,8 @@ func (m *Monitor) Start(ctx context.Context) {
 	prometheus.MustRegister(alphabetMainDivergence)
 	prometheus.MustRegister(alphabetSideDivergence)
 	prometheus.MustRegister(containersNumber)
+	prometheus.MustRegister(chainHeight)
+	prometheus.MustRegister(chainState)
 
 	if err := m.geoFetcher.Open(); err != nil {
 		m.logger.Warn("geoposition fetching disabled", zap.Error(err))
@@ -204,6 +230,9 @@ func (m *Monitor) Job(ctx context.Context) {
 
 		m.processContainersNumber()
 
+		minHeight := m.processChainHeight()
+		m.processChainState(minHeight)
+
 		select {
 		case <-time.After(m.sleep):
 			// sleep for some time before next prometheus update
@@ -507,3 +536,33 @@ func (m *Monitor) processContainersNumber() {
 
 	containersNumber.Set(float64(total))
 }
+
+func (m *Monitor) processChainHeight() uint32 {
+	var minHeight uint32
+	heightData := m.heightFetcher.FetchHeight()
+
+	for _, d := range heightData {
+		chainHeight.WithLabelValues(d.Host).Set(float64(d.Value))
+
+		if minHeight == 0 || d.Value < minHeight {
+			minHeight = d.Value
+		}
+	}
+
+	return minHeight
+}
+
+func (m *Monitor) processChainState(height uint32) {
+	if height == 0 {
+		return
+	}
+
+	stateData := m.stateFetcher.FetchState(height)
+	chainState.Reset()
+
+	h := float64(height)
+
+	for _, d := range stateData {
+		chainState.WithLabelValues(d.Host, d.Value).Set(h)
+	}
+}

pkg/multinodepool/pool.go

@@ -0,0 +1,127 @@
+package multinodepool
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"sync"
+	"time"
+
+	"github.com/nspcc-dev/neo-go/pkg/rpcclient"
+	"github.com/nspcc-dev/neofs-net-monitor/pkg/monitor"
+)
+
+// Pool collects data from each node.
+type Pool struct {
+	endpoints   []string
+	dialTimeout time.Duration
+	clients     []*rpcclient.Client
+}
+
+func NewPool(endpoints []string, dialTimeout time.Duration) *Pool {
+	return &Pool{
+		endpoints:   endpoints,
+		dialTimeout: dialTimeout,
+		clients:     make([]*rpcclient.Client, len(endpoints)),
+	}
+}
+
+func (c *Pool) Dial(ctx context.Context) error {
+	opts := rpcclient.Options{DialTimeout: c.dialTimeout}
+
+	for i, ep := range c.endpoints {
+		neoClient, err := neoGoClient(ctx, ep, opts)
+		if err != nil {
+			return fmt.Errorf("neoGoClient: %w", err)
+		}
+
+		c.clients[i] = neoClient
+	}
+
+	return nil
+}
+
+func (c *Pool) FetchHeight() []monitor.HeightData {
+	var (
+		heights    []monitor.HeightData
+		wg         sync.WaitGroup
+		heightChan = make(chan monitor.HeightData, len(c.clients))
+	)
+
+	for _, cl := range c.clients {
+		wg.Add(1)
+
+		go func(cl *rpcclient.Client) {
+			defer wg.Done()
+
+			stHeight, err := cl.GetStateHeight()
+			if err != nil {
+				log.Printf("GetStateHeight for %s: %v", cl.Endpoint(), err)
+				return
+			}
+
+			heightChan <- monitor.HeightData{
+				Host:  cl.Endpoint(),
+				Value: stHeight.Local,
+			}
+		}(cl)
+	}
+
+	go func() {
+		wg.Wait()
+		close(heightChan)
+	}()
+
+	for height := range heightChan {
+		heights = append(heights, height)
+	}
+
+	return heights
+}
+
+func (c *Pool) FetchState(height uint32) []monitor.StateData {
+	var (
+		states    []monitor.StateData
+		wg        sync.WaitGroup
+		stateChan = make(chan monitor.StateData, len(c.clients))
+	)
+
+	for _, cl := range c.clients {
+		wg.Add(1)
+
+		go func(cl *rpcclient.Client) {
+			defer wg.Done()
+
+			stHeight, err := cl.GetStateRootByHeight(height)
+			if err != nil {
+				log.Printf("GetStateRootByHeight for %s: %v", cl.Endpoint(), err)
+				return
+			}
+
+			stateChan <- monitor.StateData{
+				Host:  cl.Endpoint(),
+				Value: stHeight.Hash().String(),
+			}
+		}(cl)
+	}
+
+	go func() {
+		wg.Wait()
+		close(stateChan)
+	}()
+
+	for state := range stateChan {
+		states = append(states, state)
+	}
+
+	return states
+}
+
+func neoGoClient(ctx context.Context, endpoint string, opts rpcclient.Options) (*rpcclient.Client, error) {
+	cli, err := rpcclient.New(ctx, endpoint, opts)
+	if err != nil {
+		return nil, fmt.Errorf("can't create neo-go client: %w", err)
+	}
+
+	return cli, nil
+}