Add separate notary fetcher

cmd/neo-exporter/monitor.go

@@ -138,6 +138,11 @@ func sideChainJob(cfg *viper.Viper, neogoClient *pool.Pool, logger *zap.Logger)
 		return nil, fmt.Errorf("can't initialize side balance fetcher: %w", err)
 	}
 
+	notaryBalanceFetcher, err := monitor.NewNotaryFetcher(neogoClient)
+	if err != nil {
+		return nil, fmt.Errorf("can't initialize notary side balance fetcher: %w", err)
+	}
+
 	var (
 		balance util.Uint160
 		proxy   *util.Uint160
@@ -181,16 +186,17 @@ func sideChainJob(cfg *viper.Viper, neogoClient *pool.Pool, logger *zap.Logger)
 	}
 
 	return monitor.NewSideJob(monitor.SideJobArgs{
-		Logger:          logger,
-		Balance:         balance,
-		Proxy:           proxy,
-		AlphabetFetcher: alphabetFetcher,
-		NmFetcher:       nmFetcher,
-		IRFetcher:       nmFetcher,
-		BalanceFetcher:  balanceFetcher,
-		CnrFetcher:      cnrFetcher,
-		HeightFetcher:   neogoClient,
-		StateFetcher:    neogoClient,
-		Nep17tracker:    nep17tracker,
+		Logger:               logger,
+		Balance:              balance,
+		Proxy:                proxy,
+		AlphabetFetcher:      alphabetFetcher,
+		NmFetcher:            nmFetcher,
+		IRFetcher:            nmFetcher,
+		BalanceFetcher:       balanceFetcher,
+		NotaryBalanceFetcher: notaryBalanceFetcher,
+		CnrFetcher:           cnrFetcher,
+		HeightFetcher:        neogoClient,
+		StateFetcher:         neogoClient,
+		Nep17tracker:         nep17tracker,
 	}), nil
 }

pkg/monitor/monitor.go

@@ -21,6 +21,10 @@ type (
 		Symbol(tokenHash util.Uint160) (string, error)
 	}
 
+	NotaryBalanceFetcher interface {
+		FetchNotary(account util.Uint160) (float64, error)
+	}
+
 	AlphabetFetcher interface {
 		FetchAlphabet() (keys.PublicKeys, error)
 	}

pkg/monitor/notary_fetcher.go

@@ -0,0 +1,56 @@
+package monitor
+
+import (
+	"fmt"
+	"math"
+	"math/big"
+
+	"github.com/nspcc-dev/neo-go/pkg/rpcclient/nep17"
+	"github.com/nspcc-dev/neo-go/pkg/rpcclient/notary"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+)
+
+type (
+	// NotaryFetcher allows to fetch notary balances from account.
+	NotaryFetcher struct {
+		cli      nep17.Invoker
+		decimals *big.Float
+	}
+)
+
+const (
+	decimals = 8
+)
+
+// NewNotaryFetcher is a constructor for NotaryFetcher.
+func NewNotaryFetcher(cli nep17.Invoker) (*NotaryFetcher, error) {
+	return &NotaryFetcher{
+		cli:      cli,
+		decimals: big.NewFloat(math.Pow10(decimals)),
+	}, nil
+}
+
+func (b *NotaryFetcher) format(balance *big.Int) (float64, error) {
+	var bigFloat big.Float
+	bigFloat.SetInt(balance)
+	bigFloat.Quo(&bigFloat, b.decimals)
+
+	res, _ := bigFloat.Float64()
+
+	return res, nil
+}
+
+// FetchNotary returns the notary balance of the given account.
+func (b *NotaryFetcher) FetchNotary(account util.Uint160) (float64, error) {
+	balance, err := notary.NewReader(b.cli).BalanceOf(account)
+	if err != nil {
+		return 0, fmt.Errorf("balanceOf: %w", err)
+	}
+
+	res, err := b.format(balance)
+	if err != nil {
+		return 0, fmt.Errorf("format: %w", err)
+	}
+
+	return res, nil
+}

pkg/monitor/side_job.go

@@ -7,39 +7,40 @@ import (
 	"github.com/nspcc-dev/locode-db/pkg/locodedb"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/rpcclient/gas"
-	"github.com/nspcc-dev/neo-go/pkg/rpcclient/notary"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/prometheus/client_golang/prometheus"
 	"go.uber.org/zap"
 )
 
 type (
 	SideJobArgs struct {
-		Logger          *zap.Logger
-		Balance         util.Uint160
-		Proxy           *util.Uint160
-		AlphabetFetcher AlphabetFetcher
-		NmFetcher       NetmapFetcher
-		IRFetcher       InnerRingFetcher
-		BalanceFetcher  Nep17BalanceFetcher
-		CnrFetcher      ContainerFetcher
-		HeightFetcher   HeightFetcher
-		StateFetcher    StateFetcher
-		Nep17tracker    *Nep17tracker
+		Logger               *zap.Logger
+		Balance              util.Uint160
+		Proxy                *util.Uint160
+		AlphabetFetcher      AlphabetFetcher
+		NmFetcher            NetmapFetcher
+		IRFetcher            InnerRingFetcher
+		BalanceFetcher       Nep17BalanceFetcher
+		NotaryBalanceFetcher NotaryBalanceFetcher
+		CnrFetcher           ContainerFetcher
+		HeightFetcher        HeightFetcher
+		StateFetcher         StateFetcher
+		Nep17tracker         *Nep17tracker
 	}
 
 	SideJob struct {
-		logger          *zap.Logger
-		nmFetcher       NetmapFetcher
-		irFetcher       InnerRingFetcher
-		balanceFetcher  Nep17BalanceFetcher
-		proxy           *util.Uint160
-		cnrFetcher      ContainerFetcher
-		heightFetcher   HeightFetcher
-		stateFetcher    StateFetcher
-		alphabetFetcher AlphabetFetcher
-		balance         util.Uint160
-		nep17tracker    *Nep17tracker
+		logger               *zap.Logger
+		nmFetcher            NetmapFetcher
+		irFetcher            InnerRingFetcher
+		balanceFetcher       Nep17BalanceFetcher
+		notaryBalanceFetcher NotaryBalanceFetcher
+		proxy                *util.Uint160
+		cnrFetcher           ContainerFetcher
+		heightFetcher        HeightFetcher
+		stateFetcher         StateFetcher
+		alphabetFetcher      AlphabetFetcher
+		balance              util.Uint160
+		nep17tracker         *Nep17tracker
 	}
 
 	diffNode struct {
@@ -104,17 +105,18 @@ type (
 
 func NewSideJob(args SideJobArgs) *SideJob {
 	return &SideJob{
-		logger:          args.Logger,
-		nmFetcher:       args.NmFetcher,
-		irFetcher:       args.IRFetcher,
-		balanceFetcher:  args.BalanceFetcher,
-		proxy:           args.Proxy,
-		cnrFetcher:      args.CnrFetcher,
-		heightFetcher:   args.HeightFetcher,
-		stateFetcher:    args.StateFetcher,
-		alphabetFetcher: args.AlphabetFetcher,
-		balance:         args.Balance,
-		nep17tracker:    args.Nep17tracker,
+		logger:               args.Logger,
+		nmFetcher:            args.NmFetcher,
+		irFetcher:            args.IRFetcher,
+		balanceFetcher:       args.BalanceFetcher,
+		notaryBalanceFetcher: args.NotaryBalanceFetcher,
+		proxy:                args.Proxy,
+		cnrFetcher:           args.CnrFetcher,
+		heightFetcher:        args.HeightFetcher,
+		stateFetcher:         args.StateFetcher,
+		alphabetFetcher:      args.AlphabetFetcher,
+		balance:              args.Balance,
+		nep17tracker:         args.Nep17tracker,
 	}
 }
 
@@ -203,7 +205,7 @@ func (m *SideJob) processNetworkMap(nm NetmapInfo, candidates NetmapCandidatesIn
 			exportCountries[nodeLoc]++
 		}
 
-		balanceNotary, err := m.balanceFetcher.Fetch(notary.Hash, scriptHash)
+		balanceNotary, err := m.notaryBalanceFetcher.FetchNotary(scriptHash)
 		if err != nil {
 			m.logger.Debug("can't fetch notary balance of node from the NeoFS network map",
 				zap.String("key", keyHex),
@@ -295,7 +297,7 @@ func (m *SideJob) processSideAlphabet(alphabet keys.PublicKeys) {
 	for _, key := range alphabet {
 		keyHex := hex.EncodeToString(key.Bytes())
 
-		balanceNotary, err := m.balanceFetcher.Fetch(notary.Hash, key.GetScriptHash())
+		balanceNotary, err := m.notaryBalanceFetcher.FetchNotary(key.GetScriptHash())
 		if err != nil {
 			m.logger.Debug("can't fetch notary balance of the NeoFS Alphabet member", zap.String("key", keyHex), zap.Error(err))
 		} else {