cmd/serve.go

@@ -26,6 +26,7 @@ import (
 	"time"
 
 	"github.com/cerc-io/ipld-eth-server/v5/pkg/log"
+	"github.com/cerc-io/ipld-eth-server/v5/pkg/payments"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/mailgun/groupcache/v2"
 	"github.com/spf13/cobra"
@@ -95,6 +96,11 @@ func serve() {
 		logWithCommand.Debug("state validator disabled")
 	}
 
+	// TODO: Create required config for Nitro node
+
+	paymentsManager, _ := payments.NewPaymentsManager(true)
+	paymentsManager.Start(wg)
+
 	shutdown := make(chan os.Signal, 1)
 	signal.Notify(shutdown, os.Interrupt)
 	<-shutdown
@@ -102,6 +108,8 @@ func serve() {
 		graphQL.Stop()
 	}
 	server.Stop()
+	paymentsManager.Stop()
+
 	wg.Wait()
 }
 

go.mod

@@ -8,9 +8,10 @@ require (
 	github.com/cerc-io/ipfs-ethdb/v5 v5.0.0-alpha
 	github.com/cerc-io/ipld-eth-statedb v0.0.5-alpha
 	github.com/cerc-io/plugeth-statediff v0.1.1
-	github.com/ethereum/go-ethereum v1.11.6
+	github.com/ethereum/go-ethereum v1.12.0 // TODO: Investigate
 	github.com/google/uuid v1.3.0
 	github.com/graph-gophers/graphql-go v1.3.0
+	github.com/hashicorp/golang-lru/v2 v2.0.5
 	github.com/ipfs/go-cid v0.4.1
 	github.com/jmoiron/sqlx v1.3.5
 	github.com/joho/godotenv v1.4.0
@@ -23,6 +24,7 @@ require (
 	github.com/sirupsen/logrus v1.9.0
 	github.com/spf13/cobra v1.4.0
 	github.com/spf13/viper v1.11.0
+	github.com/statechannels/go-nitro v0.1.1
 	gorm.io/driver/postgres v1.3.7
 	gorm.io/gorm v1.23.5
 )
@@ -89,7 +91,6 @@ require (
 	github.com/hashicorp/go-bexpr v0.1.12 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d // indirect
-	github.com/hashicorp/golang-lru/v2 v2.0.5 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/holiman/bloomfilter/v2 v2.0.3 // indirect
 	github.com/holiman/uint256 v1.2.3 // indirect
@@ -230,6 +231,14 @@ require (
 	github.com/subosito/gotenv v1.2.0 // indirect
 	github.com/syndtr/goleveldb v1.0.1-0.20220614013038-64ee5596c38a // indirect
 	github.com/thoas/go-funk v0.9.3 // indirect
+	github.com/tidwall/btree v1.6.0 // indirect
+	github.com/tidwall/buntdb v1.2.10 // indirect
+	github.com/tidwall/gjson v1.14.4 // indirect
+	github.com/tidwall/grect v0.1.4 // indirect
+	github.com/tidwall/match v1.1.1 // indirect
+	github.com/tidwall/pretty v1.2.1 // indirect
+	github.com/tidwall/rtred v0.1.2 // indirect
+	github.com/tidwall/tinyqueue v0.1.1 // indirect
 	github.com/tklauser/go-sysconf v0.3.11 // indirect
 	github.com/tklauser/numcpus v0.6.1 // indirect
 	github.com/tyler-smith/go-bip39 v1.1.0 // indirect
@@ -286,6 +295,8 @@ replace (
 
 // TODO: Use releases
 replace (
-	github.com/cerc-io/ipfs-ethdb/v5 => /home/prathamesh/deepstack/ipfs-ethdb
 	github.com/cerc-io/eth-ipfs-state-validator/v5 => /home/prathamesh/deepstack/eth-ipfs-state-validator
+	github.com/cerc-io/ipfs-ethdb/v5 => /home/prathamesh/deepstack/ipfs-ethdb
 )
+
+replace github.com/statechannels/go-nitro v0.1.1 => github.com/cerc-io/go-nitro v0.1.1-ts-port-0.1.6

go.sum

@@ -91,12 +91,16 @@ github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2y
 github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g=
 github.com/btcsuite/btcd v0.0.0-20190824003749-130ea5bddde3/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
 github.com/btcsuite/btcd v0.20.1-beta/go.mod h1:wVuoA8VJLEcwgqHBwHmzLRazpKxTv13Px/pDuV7OomQ=
+github.com/btcsuite/btcd v0.22.0-beta h1:LTDpDKUM5EeOFBPM8IXpinEcmZ6FWfNZbE3lfrfdnWo=
+github.com/btcsuite/btcd v0.22.0-beta/go.mod h1:9n5ntfhhHQBIhUvlhDvD3Qg6fRUj4jkN0VB8L8svzOA=
 github.com/btcsuite/btcd/btcec/v2 v2.3.2 h1:5n0X6hX0Zk+6omWcihdYvdAlGf2DfasC0GMf7DClJ3U=
 github.com/btcsuite/btcd/btcec/v2 v2.3.2/go.mod h1:zYzJ8etWJQIv1Ogk7OzpWjowwOdXY1W/17j2MW85J04=
 github.com/btcsuite/btcd/chaincfg/chainhash v1.0.2 h1:KdUfX2zKommPRa+PD0sWZUyXe9w277ABlgELO7H04IM=
 github.com/btcsuite/btcd/chaincfg/chainhash v1.0.2/go.mod h1:7SFka0XMvUgj3hfZtydOrQY2mwhPclbT2snogU7SQQc=
 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f/go.mod h1:TdznJufoqS23FtqVCzL0ZqgP5MqXbb4fg/WgDys70nA=
 github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
+github.com/btcsuite/btcutil v1.0.3-0.20201208143702-a53e38424cce h1:YtWJF7RHm2pYCvA5t0RPmAaLUhREsKuKd+SLhxFbFeQ=
+github.com/btcsuite/btcutil v1.0.3-0.20201208143702-a53e38424cce/go.mod h1:0DVlHczLPewLcPGEIeUEzfOJhqGPQ0mJJRDBtD307+o=
 github.com/btcsuite/go-socks v0.0.0-20170105172521-4720035b7bfd/go.mod h1:HHNXQzUsZCxOoE+CPiyCTO6x34Zs86zZUiwtpXoGdtg=
 github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd/go.mod h1:F+uVaaLLH7j4eDXPRvw78tMflu7Ie2bzYOH4Y8rRKBY=
 github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg3lh6TiUghc=
@@ -108,6 +112,8 @@ github.com/cenkalti/backoff/v4 v4.2.1/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyY
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/ceramicnetwork/go-dag-jose v0.1.0 h1:yJ/HVlfKpnD3LdYP03AHyTvbm3BpPiz2oZiOeReJRdU=
 github.com/ceramicnetwork/go-dag-jose v0.1.0/go.mod h1:qYA1nYt0X8u4XoMAVoOV3upUVKtrxy/I670Dg5F0wjI=
+github.com/cerc-io/go-nitro v0.1.1-ts-port-0.1.6 h1:rtOsOFPnz1bX6Z/Ejxv19PuDEMFxXElvGpTx5pbBkXU=
+github.com/cerc-io/go-nitro v0.1.1-ts-port-0.1.6/go.mod h1:Cc6AgGm/Ou9P6vdssCPRDfrpb9iKIhY2hiPcWX4aOrw=
 github.com/cespare/cp v0.1.0 h1:SE+dxFebS7Iik5LK0tsi1k9ZCxEaFX4AjQmoyA+1dJk=
 github.com/cespare/cp v0.1.0/go.mod h1:SOGHArjBr4JWaSDEVpWpo/hNg6RoKrls6Oh40hiwW+s=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
@@ -785,6 +791,8 @@ github.com/miekg/dns v1.1.41/go.mod h1:p6aan82bvRIyn+zDIv9xYNUpwa73JcSh9BKwknJys
 github.com/miekg/dns v1.1.43/go.mod h1:+evo5L0630/F6ca/Z9+GAqzhjGyn8/c+TBaOyfEl0V4=
 github.com/miekg/dns v1.1.55 h1:GoQ4hpsj0nFLYe+bWiCToyrBEJXkQfOOIvFGFy0lEgo=
 github.com/miekg/dns v1.1.55/go.mod h1:uInx36IzPl7FYnDcMeVWxj9byh7DutNykX4G9Sj60FY=
+github.com/miguelmota/go-ethereum-hdwallet v0.1.1 h1:zdXGlHao7idpCBjEGTXThVAtMKs+IxAgivZ75xqkWK0=
+github.com/miguelmota/go-ethereum-hdwallet v0.1.1/go.mod h1:f9m9uXokAHA6WNoYOPjj4AqjJS5pquQRiYYj/XSyPYc=
 github.com/mikioh/tcp v0.0.0-20190314235350-803a9b46060c h1:bzE/A84HN25pxAuk9Eej1Kz9OUelF97nAc82bDquQI8=
 github.com/mikioh/tcp v0.0.0-20190314235350-803a9b46060c/go.mod h1:0SQS9kMwD2VsyFEB++InYyBJroV/FRmBgcydeSUcJms=
 github.com/mikioh/tcpinfo v0.0.0-20190314235526-30a79bb1804b h1:z78hV3sbSMAUoyUMM0I83AUIT6Hu17AWfgjzIbtrYFc=
@@ -1048,6 +1056,28 @@ github.com/syndtr/goleveldb v1.0.1-0.20220614013038-64ee5596c38a/go.mod h1:RRCYJ
 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07/go.mod h1:kDXzergiv9cbyO7IOYJZWg1U88JhDg3PB6klq9Hg2pA=
 github.com/thoas/go-funk v0.9.3 h1:7+nAEx3kn5ZJcnDm2Bh23N2yOtweO14bi//dvRtgLpw=
 github.com/thoas/go-funk v0.9.3/go.mod h1:+IWnUfUmFO1+WVYQWQtIJHeRRdaIyyYglZN7xzUPe4Q=
+github.com/tidwall/assert v0.1.0 h1:aWcKyRBUAdLoVebxo95N7+YZVTFF/ASTr7BN4sLP6XI=
+github.com/tidwall/assert v0.1.0/go.mod h1:QLYtGyeqse53vuELQheYl9dngGCJQ+mTtlxcktb+Kj8=
+github.com/tidwall/btree v1.6.0 h1:LDZfKfQIBHGHWSwckhXI0RPSXzlo+KYdjK7FWSqOzzg=
+github.com/tidwall/btree v1.6.0/go.mod h1:twD9XRA5jj9VUQGELzDO4HPQTNJsoWWfYEL+EUQ2cKY=
+github.com/tidwall/buntdb v1.2.10 h1:U/ebfkmYPBnyiNZIirUiWFcxA/mgzjbKlyPynFsPtyM=
+github.com/tidwall/buntdb v1.2.10/go.mod h1:lZZrZUWzlyDJKlLQ6DKAy53LnG7m5kHyrEHvvcDmBpU=
+github.com/tidwall/gjson v1.12.1/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
+github.com/tidwall/gjson v1.14.4 h1:uo0p8EbA09J7RQaflQ1aBRffTR7xedD2bcIVSYxLnkM=
+github.com/tidwall/gjson v1.14.4/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
+github.com/tidwall/grect v0.1.4 h1:dA3oIgNgWdSspFzn1kS4S/RDpZFLrIxAZOdJKjYapOg=
+github.com/tidwall/grect v0.1.4/go.mod h1:9FBsaYRaR0Tcy4UwefBX/UDcDcDy9V5jUcxHzv2jd5Q=
+github.com/tidwall/lotsa v1.0.2 h1:dNVBH5MErdaQ/xd9s769R31/n2dXavsQ0Yf4TMEHHw8=
+github.com/tidwall/lotsa v1.0.2/go.mod h1:X6NiU+4yHA3fE3Puvpnn1XMDrFZrE9JO2/w+UMuqgR8=
+github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
+github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
+github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
+github.com/tidwall/pretty v1.2.1/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/tidwall/rtred v0.1.2 h1:exmoQtOLvDoO8ud++6LwVsAMTu0KPzLTUrMln8u1yu8=
+github.com/tidwall/rtred v0.1.2/go.mod h1:hd69WNXQ5RP9vHd7dqekAz+RIdtfBogmglkZSRxCHFQ=
+github.com/tidwall/tinyqueue v0.1.1 h1:SpNEvEggbpyN5DIReaJ2/1ndroY8iyEGxPYxoSaymYE=
+github.com/tidwall/tinyqueue v0.1.1/go.mod h1:O/QNHwrnjqr6IHItYrzoHAKYhBkLI67Q096fQP5zMYw=
 github.com/tj/assert v0.0.3 h1:Df/BlaZ20mq6kuai7f5z2TvPFiwC3xaWJSDQNiIS3Rk=
 github.com/tj/assert v0.0.3/go.mod h1:Ne6X72Q+TB1AteidzQncjw9PabbMp4PBMZ1k+vd1Pvk=
 github.com/tklauser/go-sysconf v0.3.11 h1:89WgdJhk5SNwJfu+GKyYveZ4IaJ7xAkecBo+KdJV0CM=

pkg/payments/payments_manager.go

@@ -0,0 +1,273 @@
+// VulcanizeDB
+// Copyright © 2023 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package payments
+
+import (
+	"math/big"
+	"sync"
+	"time"
+
+	"github.com/cerc-io/ipld-eth-server/v5/pkg/log"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/hashicorp/golang-lru/v2/expirable"
+	"github.com/statechannels/go-nitro/node/engine"
+	"github.com/statechannels/go-nitro/node/engine/chainservice"
+	"github.com/statechannels/go-nitro/node/engine/store"
+	"github.com/statechannels/go-nitro/payments"
+
+	nitroNode "github.com/statechannels/go-nitro/node"
+	p2pms "github.com/statechannels/go-nitro/node/engine/messageservice/p2p-message-service"
+	nitroTypes "github.com/statechannels/go-nitro/types"
+)
+
+const (
+	DEFAULT_LRU_CACHE_MAX_ACCOUNTS             = 1000
+	DEFAULT_LRU_CACHE_ACCOUNT_TTL              = 30 * 60 // 30mins
+	DEFAULT_LRU_CACHE_MAX_VOUCHERS_PER_ACCOUNT = 1000
+	DEFAULT_LRU_CACHE_VOUCHER_TTL              = 5 * 60 // 5mins
+	DEFAULT_LRU_CACHE_MAX_PAYMENT_CHANNELS     = 10000
+	DEFAULT_LRU_CACHE_PAYMENT_CHANNEL_TTL      = DEFAULT_LRU_CACHE_ACCOUNT_TTL
+)
+
+type Payment struct {
+	voucher payments.Voucher
+	amount  *big.Int
+}
+
+type paymentVoucher struct {
+	payer       common.Address
+	voucherHash common.Hash
+}
+
+// Struct representing payments manager
+// Maintains either an in-process Nitro node or communication with an out-of-process Nitro node
+type PaymentsManager struct {
+	// Whether to run an in-process Nitro node
+	runInProcessNitroNode bool
+
+	// In-process Nitro node; nil when runInProcessNitroNode is false
+	nitroNode *nitroNode.Node
+
+	receivedPayments *expirable.LRU[common.Address, *expirable.LRU[common.Hash, Payment]]
+
+	paidSoFarOnChannel *expirable.LRU[nitroTypes.Destination, *big.Int]
+
+	paymentListeners []chan paymentVoucher
+
+	// Used to signal shutdown of the service
+	quitChan chan bool
+}
+
+func NewPaymentsManager(runInProcessNitroNode bool) (PaymentsManager, error) {
+	// TODO: Implement
+	var err error
+
+	pm := PaymentsManager{runInProcessNitroNode: runInProcessNitroNode}
+
+	if runInProcessNitroNode {
+		pm.nitroNode, err = initializeNitroNode()
+		if err != nil {
+			return PaymentsManager{}, err
+		}
+	}
+
+	pm.receivedPayments = expirable.NewLRU[common.Address, *expirable.LRU[common.Hash, Payment]](
+		DEFAULT_LRU_CACHE_MAX_ACCOUNTS,
+		nil,
+		time.Second*DEFAULT_LRU_CACHE_ACCOUNT_TTL,
+	)
+
+	pm.paidSoFarOnChannel = expirable.NewLRU[nitroTypes.Destination, *big.Int](
+		DEFAULT_LRU_CACHE_MAX_PAYMENT_CHANNELS,
+		nil,
+		time.Second*DEFAULT_LRU_CACHE_PAYMENT_CHANNEL_TTL,
+	)
+
+	// Load existing open payment channels with amount paid so far from the stored state
+	err = pm.loadPaymentChannels()
+	if err != nil {
+		return PaymentsManager{}, err
+	}
+
+	return pm, nil
+}
+
+func (pm *PaymentsManager) Start(wg *sync.WaitGroup) {
+	log.Info("starting payments manager")
+
+	// Channel for received vouchers
+	var receivedVouchers <-chan payments.Voucher
+	if pm.runInProcessNitroNode {
+		receivedVouchers = pm.nitroNode.ReceivedVouchers()
+	} else {
+		// TODO: Get vouchers from an out-of-process go-nitro node
+	}
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		pm.run(receivedVouchers)
+	}()
+}
+
+func (pm *PaymentsManager) Stop() error {
+	log.Info("stopping payments manager")
+	close(pm.quitChan)
+	return nil
+}
+
+func (pm *PaymentsManager) run(receivedVouchers <-chan payments.Voucher) {
+	log.Info("starting voucher subscription...")
+	for {
+		select {
+		case voucher := <-receivedVouchers:
+			payer, err := pm.getChannelCounterparty(voucher.ChannelId)
+			if err != nil {
+				// TODO: Handle
+				panic(err)
+			}
+
+			paidSoFar, ok := pm.paidSoFarOnChannel.Get(voucher.ChannelId)
+			if !ok {
+				paidSoFar = big.NewInt(0)
+			}
+
+			paymentAmount := big.NewInt(0).Sub(voucher.Amount, paidSoFar)
+			pm.paidSoFarOnChannel.Add(voucher.ChannelId, voucher.Amount)
+			log.Infof("Received a payment voucher of %s from %s", paymentAmount.String(), payer.String())
+
+			paymentsMap, ok := pm.receivedPayments.Get(payer)
+			if !ok {
+				paymentsMap = expirable.NewLRU[common.Hash, Payment](
+					DEFAULT_LRU_CACHE_MAX_VOUCHERS_PER_ACCOUNT,
+					nil,
+					DEFAULT_LRU_CACHE_VOUCHER_TTL,
+				)
+
+				pm.receivedPayments.Add(payer, paymentsMap)
+			}
+
+			voucherHash, err := voucher.Hash()
+			if err != nil {
+				// TODO: Handle
+				panic(err)
+			}
+
+			paymentsMap.Add(voucherHash, Payment{voucher: voucher, amount: paymentAmount})
+
+			for _, listener := range pm.paymentListeners {
+				listener <- paymentVoucher{payer: payer, voucherHash: voucherHash}
+			}
+		case <-pm.quitChan:
+			log.Info("stopping voucher subscription loop")
+			// TODO: stop the nitro node if that means anything
+			return
+		}
+	}
+}
+
+func (pm *PaymentsManager) getChannelCounterparty(channelId nitroTypes.Destination) (common.Address, error) {
+	associatedPaymentChannel, err := pm.nitroNode.GetPaymentChannel(channelId)
+	if err != nil {
+		return common.Address{}, err
+	}
+
+	return associatedPaymentChannel.Balance.Payer, nil
+}
+
+func (pm *PaymentsManager) loadPaymentChannels() error {
+	// TODO: Implement
+	return nil
+}
+
+func initializeNitroNode() (*nitroNode.Node, error) {
+	// TODO: Configure
+	pkString := ""
+	useDurableStore := true
+	durableStoreFolder := "./data/nitro-store"
+	msgPort := 3005
+	wsMsgPort := 5005
+	chainUrl := "ws://127.0.0.1:8546"
+	chainStartBlock := uint64(0)
+	chainPk := ""
+	naAddress := ""
+	vpaAddress := ""
+	caAddress := ""
+
+	chainAuthToken := ""
+	publicIp := "0.0.0.0"
+
+	chainOpts := chainservice.ChainOpts{
+		ChainUrl:        chainUrl,
+		ChainStartBlock: chainStartBlock,
+		ChainAuthToken:  chainAuthToken,
+		ChainPk:         chainPk,
+		NaAddress:       common.HexToAddress(naAddress),
+		VpaAddress:      common.HexToAddress(vpaAddress),
+		CaAddress:       common.HexToAddress(caAddress),
+	}
+
+	storeOpts := store.StoreOpts{
+		PkBytes:            common.Hex2Bytes(pkString),
+		UseDurableStore:    useDurableStore,
+		DurableStoreFolder: durableStoreFolder,
+	}
+
+	peerSlice := []string{}
+
+	messageOpts := p2pms.MessageOpts{
+		PkBytes:   common.Hex2Bytes(pkString),
+		TcpPort:   msgPort,
+		WsMsgPort: wsMsgPort,
+		BootPeers: peerSlice,
+		PublicIp:  publicIp,
+	}
+
+	ourStore, err := store.NewStore(storeOpts)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Info("Initializing message service...", " tcp port=", messageOpts.TcpPort, " web socket port=", messageOpts.WsMsgPort)
+	messageOpts.SCAddr = *ourStore.GetAddress()
+	messageService := p2pms.NewMessageService(messageOpts)
+
+	// Compare chainOpts.ChainStartBlock to lastBlockNum seen in store. The larger of the two
+	// gets passed as an argument when creating NewEthChainService
+	storeBlockNum, err := ourStore.GetLastBlockNumSeen()
+	if err != nil {
+		return nil, err
+	}
+	if storeBlockNum > chainOpts.ChainStartBlock {
+		chainOpts.ChainStartBlock = storeBlockNum
+	}
+
+	log.Info("Initializing chain service...")
+	ourChain, err := chainservice.NewEthChainService(chainOpts)
+	if err != nil {
+		return nil, err
+	}
+
+	node := nitroNode.New(
+		messageService,
+		ourChain,
+		ourStore,
+		&engine.PermissivePolicy{},
+	)
+
+	return &node, nil
+}