Repository: algorand/indexer
Pull request #292 (2021-01-29 15:29:58)

Fix asset close accounting issue.
## Summary

When an asset is closed we need to know the exact asset balance at that time. With the existing logic, we apply all asset payments before closing the asset. Because of this, if the asset receives payment after it was closed, Indexer incorrectly sends that payment to the close-to address.

## Test Plan

1) New unit tests verify that subround accounting is done as designed for asset closes.
2) New unit/integration test to execute the subround accounting object on a DB, with this test I was able to test the before and after of this change and see that something was fixed.
3) Re-indexing betanet, I'll verify that the 5 bad transactions have been corrected.


Patch:
diff --git a/accounting/accounting.go b/accounting/accounting.go
index 1966d28..f27c10a 100644
--- a/accounting/accounting.go
+++ b/accounting/accounting.go
@@ -35,16 +35,23 @@ type State struct {
 
 // New creates a new State object.
 func New() *State {
-	return &State{defaultFrozen: make(map[uint64]bool)}
+	result := &State{defaultFrozen: make(map[uint64]bool)}
+	result.Clear()
+	return result
 }
 
 // InitRound should be called before each round to initialize the accounting state.
 func (accounting *State) InitRound(block types.Block) error {
+	return accounting.InitRoundParts(uint64(block.Round), block.FeeSink, block.RewardsPool, block.RewardsLevel)
+}
+
+// InitRoundParts are the specific parts from a block needed to initialize accounting. Used for testing, normally you would pass in the block.
+func (accounting *State) InitRoundParts(round uint64, feeSink, rewardsPool atypes.Address, rewardsLevel uint64) error {
 	accounting.RoundUpdates.Clear()
-	accounting.feeAddr = block.FeeSink
-	accounting.rewardAddr = block.RewardsPool
-	accounting.rewardsLevel = block.RewardsLevel
-	accounting.currentRound = uint64(block.Round)
+	accounting.feeAddr = feeSink
+	accounting.rewardAddr = rewardsPool
+	accounting.rewardsLevel = rewardsLevel
+	accounting.currentRound = round
 	return nil
 }
 
@@ -141,7 +148,9 @@ func (accounting *State) updateAccountData(addr types.Address, key string, field
 }
 
 func (accounting *State) updateAsset(addr types.Address, assetID uint64, add, sub uint64) {
-	updatelist := accounting.AssetUpdates[addr]
+	// Get update list from final subround. When a subround ends an empty subround is appended
+	// so there is no need to check whether an account has closed.
+	updatelist := accounting.AssetUpdates[len(accounting.AssetUpdates)-1][addr]
 	for i, up := range updatelist {
 		if up.AssetID == assetID {
 			if add != 0 {
@@ -158,9 +167,6 @@ func (accounting *State) updateAsset(addr types.Address, assetID uint64, add, su
 			return
 		}
 	}
-	if accounting.AssetUpdates == nil {
-		accounting.AssetUpdates = make(map[[32]byte][]idb.AssetUpdate)
-	}
 
 	au := idb.AssetUpdate{AssetID: assetID, DefaultFrozen: accounting.defaultFrozen[assetID]}
 	if add != 0 {
@@ -173,7 +179,9 @@ func (accounting *State) updateAsset(addr types.Address, assetID uint64, add, su
 		xa.SetUint64(sub)
 		au.Delta.Sub(&au.Delta, &xa)
 	}
-	accounting.AssetUpdates[addr] = append(updatelist, au)
+
+	// Add the AssetUpdate to the final subround
+	accounting.AssetUpdates[len(accounting.AssetUpdates)-1][addr] = append(updatelist, au)
 }
 
 func (accounting *State) updateTxnAsset(round uint64, intra int, assetID uint64) {
@@ -181,17 +189,27 @@ func (accounting *State) updateTxnAsset(round uint64, intra int, assetID uint64)
 }
 
 func (accounting *State) closeAsset(from types.Address, assetID uint64, to types.Address, round uint64, offset int) {
-	accounting.AssetCloses = append(
-		accounting.AssetCloses,
-		idb.AssetClose{
+	updatelist := accounting.AssetUpdates[len(accounting.AssetUpdates)-1][from]
+
+	assetClose := &idb.AssetClose{
 			CloseTo:       to,
 			AssetID:       assetID,
 			Sender:        from,
 			DefaultFrozen: accounting.defaultFrozen[assetID],
 			Round:         round,
 			Offset:        uint64(offset),
-		},
-	)
+	}
+
+	// Add an empty AssetUpdate with asset close reference.
+	accounting.AssetUpdates[len(accounting.AssetUpdates)-1][from] = append(updatelist, idb.AssetUpdate{
+		AssetID:       assetID,
+		Delta:         *big.NewInt(0),
+		DefaultFrozen: assetClose.DefaultFrozen,
+		Closed:        assetClose,
+	})
+
+	// Put an empty subround for any subsequent updates.
+	accounting.AssetUpdates = append(accounting.AssetUpdates, make(map[[32]byte][]idb.AssetUpdate))
 }
 func (accounting *State) freezeAsset(addr types.Address, assetID uint64, frozen bool) {
 	accounting.FreezeUpdates = append(accounting.FreezeUpdates, idb.FreezeUpdate{Addr: addr, AssetID: assetID, Frozen: frozen})
diff --git a/go.mod b/go.mod
index bc568eb..916ce4e 100644
--- a/go.mod
+++ b/go.mod
@@ -8,16 +8,14 @@ require (
 	github.com/algorand/oapi-codegen v1.3.5-algorand5
 	github.com/getkin/kin-openapi v0.19.0
 	github.com/labstack/echo/v4 v4.1.16
-	github.com/lib/pq v1.3.0
+	github.com/lib/pq v1.5.1
 	github.com/mattn/go-colorable v0.1.7 // indirect
+	github.com/orlangure/gnomock v0.12.0
 	github.com/sirupsen/logrus v1.5.0
 	github.com/spf13/cobra v0.0.5
-	github.com/spf13/pflag v1.0.3
+	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.7.1
 	github.com/stretchr/testify v1.6.1
 	github.com/valyala/fasttemplate v1.2.0 // indirect
 	golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de // indirect
-	golang.org/x/net v0.0.0-20200707034311-ab3426394381 // indirect
-	golang.org/x/sys v0.0.0-20200728102440-3e129f6d46b1 // indirect
-	golang.org/x/text v0.3.3 // indirect
 )
diff --git a/go.sum b/go.sum
index 4615c43..745fbfc 100644
--- a/go.sum
+++ b/go.sum
@@ -5,16 +5,54 @@ cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6A
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@@ -29,12 +67,19 @@ github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hC
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@@ -240,6 +438,7 @@ github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd
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@@ -250,22 +449,44 @@ github.com/valyala/fasttemplate v1.1.0 h1:RZqt0yGBsps8NGvLSGW804QQqCUYYLsaOjTVHy
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@@ -278,6 +499,11 @@ golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL
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@@ -287,14 +513,23 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -308,23 +543,47 @@ golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn
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+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4 h1:UoveltGrhghAA7ePc+e+QYDHXrBps2PqFZiHkGR/xK8=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+k8s.io/api v0.19.2/go.mod h1:IQpK0zFQ1xc5iNIQPqzgoOwuFugaYHK4iCknlAQP9nI=
+k8s.io/apimachinery v0.19.2/go.mod h1:DnPGDnARWFvYa3pMHgSxtbZb7gpzzAZ1pTfaUNDVlmA=
+k8s.io/client-go v0.19.2/go.mod h1:S5wPhCqyDNAlzM9CnEdgTGV4OqhsW3jGO1UM1epwfJA=
+k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
+k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
+k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
+k8s.io/kube-openapi v0.0.0-20200805222855-6aeccd4b50c6/go.mod h1:UuqjUnNftUyPE5H64/qeyjQoUZhGpeFDVdxjTeEVN2o=
+k8s.io/utils v0.0.0-20200729134348-d5654de09c73/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
+k8s.io/utils v0.0.0-20201005171033-6301aaf42dc7/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/structured-merge-diff/v4 v4.0.1/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
diff --git a/idb/dummy.go b/idb/dummy.go
index 85172b1..32dbbdc 100644
--- a/idb/dummy.go
+++ b/idb/dummy.go
@@ -450,6 +450,7 @@ type AssetUpdate struct {
 	AssetID       uint64
 	Delta         big.Int
 	DefaultFrozen bool
+	Closed        *AssetClose
 }
 
 // FreezeUpdate is used by the accounting and IndexerDb implementations to share modifications in a block.
@@ -505,9 +506,20 @@ type RoundUpdates struct {
 
 	AcfgUpdates     []AcfgUpdate
 	TxnAssetUpdates []TxnAssetUpdate
-	AssetUpdates    map[[32]byte][]AssetUpdate
+
+	// AssetUpdates is more complicated than AlgoUpdates because there
+	// are no apply data values to work with in the event of a close.
+	// The way we handle this is by breaking the round into sub-rounds,
+	// which is represented by the overall slice.
+	// Updates should be processed one subround at a time, the updates
+	// within a subround can be processed in order for each addresses
+	// updates, which have already been grouped together in the event
+	// of multiple transactions between two accounts.
+	// The next subround starts when an account close has been detected
+	// Once a subround has been processed, move to the next subround and
+	// apply the updates.
+	AssetUpdates    []map[[32]byte][]AssetUpdate
 	FreezeUpdates   []FreezeUpdate
-	AssetCloses     []AssetClose
 	AssetDestroys   []uint64
 
 	AppGlobalDeltas []AppDelta
@@ -522,8 +534,8 @@ func (ru *RoundUpdates) Clear() {
 	ru.AcfgUpdates = nil
 	ru.TxnAssetUpdates = nil
 	ru.AssetUpdates = nil
+	ru.AssetUpdates = append(ru.AssetUpdates, make(map[[32]byte][]AssetUpdate, 0))
 	ru.FreezeUpdates = nil
-	ru.AssetCloses = nil
 	ru.AssetDestroys = nil
 	ru.AppGlobalDeltas = nil
 	ru.AppLocalDeltas = nil
diff --git a/idb/postgres/postgres.go b/idb/postgres/postgres.go
index 554445a..d5d4ef6 100644
--- a/idb/postgres/postgres.go
+++ b/idb/postgres/postgres.go
@@ -871,52 +871,97 @@ func (db *IndexerDb) CommitRoundAccounting(updates idb.RoundUpdates, round, rewa
 		}
 		defer uta.Close()
 	}
-	if len(updates.AssetUpdates) > 0 {
+	if len(updates.AssetUpdates) > 0 && len(updates.AssetUpdates[0]) > 0 {
 		any = true
-		// Create new account_asset, or initialize a previously destroyed asset.
+
+		// Create new account_asset, initialize a previously destroyed asset, or apply the balance delta.
 		seta, err := tx.Prepare(`INSERT INTO account_asset (addr, assetid, amount, frozen, created_at) VALUES ($1, $2, $3, $4, $5) ON CONFLICT (addr, assetid) DO UPDATE SET amount = account_asset.amount + EXCLUDED.amount`)
 		if err != nil {
 			return fmt.Errorf("prepare set account_asset, %v", err)
 		}
 		defer seta.Close()
-		for addr, aulist := range updates.AssetUpdates {
-			for _, au := range aulist {
-				if au.AssetID == debugAsset {
-					db.log.Errorf("%d axfer %s %s", round, b64(addr[:]), obs(au))
-				}
-				if au.Delta.IsInt64() {
-					// easy case
-					delta := au.Delta.Int64()
-					// don't skip delta == 0; mark opt-in
-					_, err = seta.Exec(addr[:], au.AssetID, delta, au.DefaultFrozen, round)
-					if err != nil {
-						return fmt.Errorf("update account asset, %v", err)
-					}
-				} else {
-					sign := au.Delta.Sign()
-					var mi big.Int
-					var step int64
-					if sign > 0 {
-						mi.SetInt64(math.MaxInt64)
-						step = math.MaxInt64
-					} else if sign < 0 {
-						mi.SetInt64(math.MinInt64)
-						step = math.MinInt64
-					} else {
-						continue
+
+		// On asset opt-out attach some extra "apply data" metadata to allow rewinding the asset close if requested.
+		acc, err := tx.Prepare(`WITH aaamount AS (SELECT ($1)::bigint as round, ($2)::bigint as intra, x.amount FROM account_asset x WHERE x.addr = $3 AND x.assetid = $4)
+UPDATE txn ut SET extra = jsonb_set(coalesce(ut.extra, '{}'::jsonb), '{aca}', to_jsonb(aaamount.amount)) FROM aaamount WHERE ut.round = aaamount.round AND ut.intra = aaamount.intra`)
+		if err != nil {
+			return fmt.Errorf("prepare asset close0, %v", err)
+		}
+		defer acc.Close()
+		// On asset opt-out update the CloseTo account_asset
+		acs, err := tx.Prepare(`INSERT INTO account_asset (addr, assetid, amount, frozen, created_at)
+SELECT $1, $2, x.amount, $3, $6 FROM account_asset x WHERE x.addr = $4 AND x.assetid = $5
+ON CONFLICT (addr, assetid) DO UPDATE SET amount = account_asset.amount + EXCLUDED.amount`)
+		if err != nil {
+			return fmt.Errorf("prepare asset close1, %v", err)
+		}
+		defer acs.Close()
+		// On asset opt-out mark the account_asset as closed with zero balance.
+		acd, err := tx.Prepare(`UPDATE account_asset SET amount = 0, closed_at = $1 WHERE addr = $2 AND assetid = $3`)
+		if err != nil {
+			return fmt.Errorf("prepare asset close2, %v", err)
+		}
+		defer acd.Close()
+
+
+		for _, subround := range updates.AssetUpdates {
+			for addr, aulist := range subround {
+				for _, au := range aulist {
+					if au.AssetID == debugAsset {
+						db.log.Errorf("%d axfer %s %s", round, b64(addr[:]), obs(au))
 					}
-					for !au.Delta.IsInt64() {
-						_, err = seta.Exec(addr[:], au.AssetID, step, au.DefaultFrozen, round)
+
+					// Apply deltas
+					if au.Delta.IsInt64() {
+						// easy case
+						delta := au.Delta.Int64()
+						// don't skip delta == 0; mark opt-in
+						_, err = seta.Exec(addr[:], au.AssetID, delta, au.DefaultFrozen, round)
 						if err != nil {
 							return fmt.Errorf("update account asset, %v", err)
 						}
-						au.Delta.Sub(&au.Delta, &mi)
+					} else {
+						sign := au.Delta.Sign()
+						var mi big.Int
+						var step int64
+						if sign > 0 {
+							mi.SetInt64(math.MaxInt64)
+							step = math.MaxInt64
+						} else if sign < 0 {
+							mi.SetInt64(math.MinInt64)
+							step = math.MinInt64
+						} else {
+							continue
+						}
+						for !au.Delta.IsInt64() {
+							_, err = seta.Exec(addr[:], au.AssetID, step, au.DefaultFrozen, round)
+							if err != nil {
+								return fmt.Errorf("update account asset, %v", err)
+							}
+							au.Delta.Sub(&au.Delta, &mi)
+						}
+						sign = au.Delta.Sign()
+						if sign != 0 {
+							_, err = seta.Exec(addr[:], au.AssetID, au.Delta.Int64(), au.DefaultFrozen, round)
+							if err != nil {
+								return fmt.Errorf("update account asset, %v", err)
+							}
+						}
 					}
-					sign = au.Delta.Sign()
-					if sign != 0 {
-						_, err = seta.Exec(addr[:], au.AssetID, au.Delta.Int64(), au.DefaultFrozen, round)
+
+					// Close holding before continuing to next subround.
+					if au.Closed != nil {
+						_, err = acc.Exec(au.Closed.Round, au.Closed.Offset, au.Closed.Sender[:], au.Closed.AssetID)
 						if err != nil {
-							return fmt.Errorf("update account asset, %v", err)
+							return fmt.Errorf("asset close record amount, %v", err)
+						}
+						_, err = acs.Exec(au.Closed.CloseTo[:], au.Closed.AssetID, au.Closed.DefaultFrozen, au.Closed.Sender[:], au.Closed.AssetID, round)
+						if err != nil {
+							return fmt.Errorf("asset close send, %v", err)
+						}
+						_, err = acd.Exec(round, au.Closed.Sender[:], au.Closed.AssetID)
+						if err != nil {
+							return fmt.Errorf("asset close del, %v", err)
 						}
 					}
 				}
@@ -940,47 +985,6 @@ func (db *IndexerDb) CommitRoundAccounting(updates idb.RoundUpdates, round, rewa
 			}
 		}
 	}
-	if len(updates.AssetCloses) > 0 {
-		any = true
-		// Attach some extra "apply data" metadata to allow rewinding the asset close if requested.
-		acc, err := tx.Prepare(`WITH aaamount AS (SELECT ($1)::bigint as round, ($2)::bigint as intra, x.amount FROM account_asset x WHERE x.addr = $3 AND x.assetid = $4)
-UPDATE txn ut SET extra = jsonb_set(coalesce(ut.extra, '{}'::jsonb), '{aca}', to_jsonb(aaamount.amount)) FROM aaamount WHERE ut.round = aaamount.round AND ut.intra = aaamount.intra`)
-		if err != nil {
-			return fmt.Errorf("prepare asset close0, %v", err)
-		}
-		defer acc.Close()
-		// Update the CloseTo account_asset
-		acs, err := tx.Prepare(`INSERT INTO account_asset (addr, assetid, amount, frozen, created_at)
-SELECT $1, $2, x.amount, $3, $6 FROM account_asset x WHERE x.addr = $4 AND x.assetid = $5
-ON CONFLICT (addr, assetid) DO UPDATE SET amount = account_asset.amount + EXCLUDED.amount`)
-		if err != nil {
-			return fmt.Errorf("prepare asset close1, %v", err)
-		}
-		defer acs.Close()
-		// Mark the account_asset as closed with zero balance.
-		acd, err := tx.Prepare(`UPDATE account_asset SET amount = 0, closed_at = $1 WHERE addr = $2 AND assetid = $3`)
-		if err != nil {
-			return fmt.Errorf("prepare asset close2, %v", err)
-		}
-		defer acd.Close()
-		for _, ac := range updates.AssetCloses {
-			if ac.AssetID == debugAsset {
-				db.log.Errorf("%d close %s", round, obs(ac))
-			}
-			_, err = acc.Exec(ac.Round, ac.Offset, ac.Sender[:], ac.AssetID)
-			if err != nil {
-				return fmt.Errorf("asset close record amount, %v", err)
-			}
-			_, err = acs.Exec(ac.CloseTo[:], ac.AssetID, ac.DefaultFrozen, ac.Sender[:], ac.AssetID, round)
-			if err != nil {
-				return fmt.Errorf("asset close send, %v", err)
-			}
-			_, err = acd.Exec(round, ac.Sender[:], ac.AssetID)
-			if err != nil {
-				return fmt.Errorf("asset close del, %v", err)
-			}
-		}
-	}
 	if len(updates.AssetDestroys) > 0 {
 		// Note! leaves `asset` and `account_asset` rows present for historical reference, but deletes all holdings from all accounts
 		any = true


Test patch:
diff --git a/accounting/accounting_test.go b/accounting/accounting_test.go
index 8727eb2..2428cbc 100644
--- a/accounting/accounting_test.go
+++ b/accounting/accounting_test.go
@@ -1,70 +1,19 @@
 package accounting
 
 import (
-	"fmt"
 	"testing"
 
-	"github.com/algorand/go-algorand-sdk/encoding/msgpack"
 	"github.com/algorand/go-algorand-sdk/types"
 	"github.com/stretchr/testify/assert"
 
 	"github.com/algorand/indexer/idb"
+	"github.com/algorand/indexer/util/test"
 )
 
-var mainAcct = decodeAddressOrPanic("GJR76Q6OXNZ2CYIVCFCDTJRBAAR6TYEJJENEII3G2U3JH546SPBQA62IFY")
-var accountB = decodeAddressOrPanic("N5T74SANUWLHI6ZWYFQBEB6J2VXBTYUYZNWQB2V26DCF4ARKC7GDUW3IRU")
-var accountC = decodeAddressOrPanic("OKUWMFFEKF4B4D7FRQYBVV3C2SNS54ZO4WZ2MJ3576UYKFDHM5P3AFMRWE")
-var feeAddr = decodeAddressOrPanic("ZROKLZW4GVOK5WQIF2GUR6LHFVEZBMV56BIQEQD4OTIZL2BPSYYUKFBSHM")
-var rewardAddr = decodeAddressOrPanic("4C3S3A5II6AYMEADSW7EVL7JAKVU2ASJMMJAGVUROIJHYMS6B24NCXVEWM")
-
-// open / close are configured
-var openMainStxn, openMain = makePayTxnRowOrPanic(10, 1000, 10234, 0, 111, 1111, 0, accountC, mainAcct, types.ZeroAddress)
-var closeMainToBCStxn, closeMainToBC = makePayTxnRowOrPanic(10, 1000, 1234, 9111, 0, 111, 111, mainAcct, accountC, accountB)
-
-func decodeAddressOrPanic(addr string) types.Address {
-	if addr == "" {
-		return types.ZeroAddress
-	}
-
-	result, err := types.DecodeAddress(addr)
-	if err != nil {
-		panic(fmt.Sprintf("Failed to decode address: '%s'", addr))
-	}
-	return result
-}
-
-func makePayTxnRowOrPanic(round, fee, amt, closeAmt, sendRewards, receiveRewards, closeRewards uint64, sender, receiver, close types.Address) (*types.SignedTxnWithAD, *idb.TxnRow) {
-	txn := types.SignedTxnWithAD{
-		SignedTxn: types.SignedTxn{
-			Txn: types.Transaction{
-				Type: "pay",
-				Header: types.Header{
-					Sender:     sender,
-					Fee:        types.MicroAlgos(fee),
-					FirstValid: types.Round(round),
-					LastValid:  types.Round(round),
-				},
-				PaymentTxnFields: types.PaymentTxnFields{
-					Receiver:         receiver,
-					Amount:           types.MicroAlgos(amt),
-					CloseRemainderTo: close,
-				},
-			},
-		},
-		ApplyData: types.ApplyData{
-			ClosingAmount:   types.MicroAlgos(closeAmt),
-			SenderRewards:   types.MicroAlgos(sendRewards),
-			ReceiverRewards: types.MicroAlgos(receiveRewards),
-			CloseRewards:    types.MicroAlgos(closeRewards),
-		},
-	}
-
-	txnRow := idb.TxnRow{
-		Round:    uint64(txn.Txn.FirstValid),
-		TxnBytes: msgpack.Encode(txn),
-	}
-
-	return &txn, &txnRow
+func GetAccounting() *State {
+	accountingState := New()
+	accountingState.InitRoundParts(test.Round, test.FeeAddr, test.RewardAddr, 0)
+	return accountingState
 }
 
 func assertUpdates(t *testing.T, update *idb.AlgoUpdate, closed bool, balance, rewards int64) {
@@ -73,14 +22,6 @@ func assertUpdates(t *testing.T, update *idb.AlgoUpdate, closed bool, balance, r
 	assert.Equal(t, rewards, update.Rewards)
 }
 
-func getAccounting() *State {
-	accountingState := New()
-	accountingState.feeAddr = feeAddr
-	accountingState.rewardAddr = rewardAddr
-	accountingState.currentRound = closeMainToBC.Round
-	return accountingState
-}
-
 func getSenderAmounts(txn *types.SignedTxnWithAD) (balance, rewards int64) {
 	balance = -int64(txn.Txn.Amount) + -int64(txn.Txn.Fee) + -int64(txn.ClosingAmount) + int64(txn.SenderRewards)
 	rewards = int64(txn.SenderRewards)
@@ -102,65 +43,113 @@ func getCloseAmounts(txn *types.SignedTxnWithAD) (balance, rewards int64) {
 // TestSimplePayment checks that the accounting deltas are correct for a simple single payment.
 func TestSimplePayment(t *testing.T) {
 	var update *idb.AlgoUpdate
-	state := getAccounting()
-	state.AddTransaction(openMain)
+	state := GetAccounting()
+	state.AddTransaction(test.OpenMain)
 
-	senderBalance, senderRewards := getSenderAmounts(openMainStxn)
-	update = state.AlgoUpdates[openMainStxn.Txn.Sender]
+	senderBalance, senderRewards := getSenderAmounts(test.OpenMainStxn)
+	update = state.AlgoUpdates[test.OpenMainStxn.Txn.Sender]
 	assertUpdates(t, update, false, senderBalance, senderRewards)
 
-	receiverBalance, receiverRewards := getReceiverAmounts(openMainStxn)
-	update = state.AlgoUpdates[openMainStxn.Txn.Receiver]
+	receiverBalance, receiverRewards := getReceiverAmounts(test.OpenMainStxn)
+	update = state.AlgoUpdates[test.OpenMainStxn.Txn.Receiver]
 	assertUpdates(t, update, false, receiverBalance, receiverRewards)
 }
 
 // TestSimpleAccountClose verifies that the accounting state is set correctly for an account being closed.
 func TestSimpleAccountClose(t *testing.T) {
-	state := getAccounting()
-	state.AddTransaction(closeMainToBC)
+	state := GetAccounting()
+	state.AddTransaction(test.CloseMainToBC)
 
-	senderBalance, _ := getSenderAmounts(closeMainToBCStxn)
-	assertUpdates(t, state.AlgoUpdates[mainAcct], true, senderBalance, 0)
+	senderBalance, _ := getSenderAmounts(test.CloseMainToBCStxn)
+	assertUpdates(t, state.AlgoUpdates[test.AccountA], true, senderBalance, 0)
 
-	closeBalance, closeRewards := getCloseAmounts(closeMainToBCStxn)
-	assertUpdates(t, state.AlgoUpdates[closeMainToBCStxn.Txn.CloseRemainderTo], false, closeBalance, closeRewards)
+	closeBalance, closeRewards := getCloseAmounts(test.CloseMainToBCStxn)
+	assertUpdates(t, state.AlgoUpdates[test.CloseMainToBCStxn.Txn.CloseRemainderTo], false, closeBalance, closeRewards)
 
-	receiverBalance, receiverRewards := getReceiverAmounts(closeMainToBCStxn)
-	assertUpdates(t, state.AlgoUpdates[closeMainToBCStxn.Txn.Receiver], false, receiverBalance, receiverRewards)
+	receiverBalance, receiverRewards := getReceiverAmounts(test.CloseMainToBCStxn)
+	assertUpdates(t, state.AlgoUpdates[test.CloseMainToBCStxn.Txn.Receiver], false, receiverBalance, receiverRewards)
 }
 
 // TestOpenClose verifies that the accounting state is set correctly when an account is opened and closed in the same round.
 func TestOpenClose(t *testing.T) {
 	var update *idb.AlgoUpdate
-	state := getAccounting()
-	state.AddTransaction(openMain)
+	state := GetAccounting()
+	state.AddTransaction(test.OpenMain)
 	// In order to make sure rewards were actually reset, they need to be non-zero at this point
-	assert.True(t, state.AlgoUpdates[mainAcct].Rewards > 0)
-	state.AddTransaction(closeMainToBC)
+	assert.True(t, state.AlgoUpdates[test.AccountA].Rewards > 0)
+	state.AddTransaction(test.CloseMainToBC)
 
 	// main account balance should add up to 0, and rewards should be reset to 0
-	update = state.AlgoUpdates[mainAcct]
+	update = state.AlgoUpdates[test.AccountA]
 	assertUpdates(t, update, true, 0, 0)
 
-	senderBalance, senderRewards := getSenderAmounts(openMainStxn)
-	receiverBalance, receiverRewards := getReceiverAmounts(closeMainToBCStxn)
-	update = state.AlgoUpdates[openMainStxn.Txn.Sender]
+	senderBalance, senderRewards := getSenderAmounts(test.OpenMainStxn)
+	receiverBalance, receiverRewards := getReceiverAmounts(test.CloseMainToBCStxn)
+	update = state.AlgoUpdates[test.OpenMainStxn.Txn.Sender]
 	assertUpdates(t, update, false, senderBalance+receiverBalance, senderRewards+receiverRewards)
 }
 
 // TestCloseOpen verifies that the accounting state is set correctly when an account is closed then reopened in the same round.
 func TestCloseOpen(t *testing.T) {
 	var update *idb.AlgoUpdate
-	state := getAccounting()
-	state.AddTransaction(openMain)
-	state.AddTransaction(closeMainToBC)
+	state := GetAccounting()
+	state.AddTransaction(test.OpenMain)
+	state.AddTransaction(test.CloseMainToBC)
 	// In the real world this would be a different transaction, but this is a test.
-	state.AddTransaction(openMain)
+	state.AddTransaction(test.OpenMain)
 
 	// The account is closed, but account was closed, but then re-opened and somehow accumulated rewards.
 	// This could happen in a real network if the main account was re-opened by another close-to transaction which
 	// sent closeRewards to the main-account. Yikes.
-	receiverBalance, receiverRewards := getReceiverAmounts(openMainStxn)
-	update = state.AlgoUpdates[mainAcct]
+	receiverBalance, receiverRewards := getReceiverAmounts(test.OpenMainStxn)
+	update = state.AlgoUpdates[test.AccountA]
 	assertUpdates(t, update, true, receiverBalance, receiverRewards)
 }
+
+// TestAssetCloseReopenPay checks that a subround is used when an asset close occurs.
+func TestAssetCloseReopenPay(t *testing.T) {
+	assetid := uint64(22222)
+	amt := uint64(10000)
+	_, closeMain := test.MakeAssetTxnOrPanic(test.Round, assetid, 0, test.AccountA, test.AccountB, test.AccountB)
+	_, optinMain := test.MakeAssetTxnOrPanic(test.Round, assetid, 0, test.AccountA, test.AccountA, types.ZeroAddress)
+	_, payMain := test.MakeAssetTxnOrPanic(test.Round, assetid, amt, test.AccountB, test.AccountA, types.ZeroAddress)
+
+	state := GetAccounting()
+	state.AddTransaction(closeMain)
+	state.AddTransaction(optinMain)
+	state.AddTransaction(payMain)
+
+	// There should be two subrounds because the first transaction was a close.
+	assert.Len(t, state.RoundUpdates.AssetUpdates, 2)
+
+	// Subround 1 has 1 update (the close)
+	assert.Len(t, state.RoundUpdates.AssetUpdates[0], 1)
+	assert.Equal(t, state.RoundUpdates.AssetUpdates[0][test.AccountA][0].Delta.Int64(), int64(0))
+	assert.NotNil(t, state.RoundUpdates.AssetUpdates[0][test.AccountA][0].Closed)
+
+	// Subround 2 has 2 updates (debit one account, credit the other)
+	assert.Len(t, state.RoundUpdates.AssetUpdates[1], 2)
+	assert.Equal(t, state.RoundUpdates.AssetUpdates[1][test.AccountA][0].Delta.Int64(), int64(amt))
+	assert.Equal(t, state.RoundUpdates.AssetUpdates[1][test.AccountB][0].Delta.Int64(), int64(amt) * -1)
+}
+
+// TestAssetCloseWithAmount checks that close with an amount creates a delta
+func TestAssetCloseWithAmountReopenPay(t *testing.T) {
+	assetid := uint64(22222)
+	amt := uint64(10000)
+	_, closeMain := test.MakeAssetTxnOrPanic(test.Round, assetid, amt, test.AccountA, test.AccountB, test.AccountB)
+
+	state := GetAccounting()
+	state.AddTransaction(closeMain)
+
+	// There should be two subrounds because the first transaction was a close.
+	assert.Len(t, state.RoundUpdates.AssetUpdates, 2)
+
+	// Subround 1 has 2 updates (one debit, one close)
+	assert.Len(t, state.RoundUpdates.AssetUpdates[0], 2)
+	assert.Equal(t, int64(amt) * -1, state.RoundUpdates.AssetUpdates[0][test.AccountA][0].Delta.Int64())
+	assert.NotNil(t, state.RoundUpdates.AssetUpdates[0][test.AccountA][1].Closed)
+
+	// Subround 2 is empty
+	assert.Len(t, state.RoundUpdates.AssetUpdates[1], 0)
+}
diff --git a/idb/postgres/postgres_integration_test.go b/idb/postgres/postgres_integration_test.go
new file mode 100644
index 0000000..6b957c0
--- /dev/null
+++ b/idb/postgres/postgres_integration_test.go
@@ -0,0 +1,136 @@
+package postgres
+
+import (
+	"database/sql"
+	"fmt"
+	"testing"
+
+	_ "github.com/lib/pq"
+	"github.com/orlangure/gnomock"
+	"github.com/orlangure/gnomock/preset/postgres"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/algorand/go-algorand-sdk/types"
+	"github.com/algorand/indexer/accounting"
+	"github.com/algorand/indexer/idb"
+	"github.com/algorand/indexer/util/test"
+)
+
+// getAccounting initializes the ac counting state for testing.
+func getAccounting() *accounting.State {
+	accountingState := accounting.New()
+	accountingState.InitRoundParts(test.Round, test.FeeAddr, test.RewardAddr, 0)
+	return accountingState
+}
+
+// setupPostgres starts a gnomock postgres DB then returns the connection string and a shutdown function.
+func setupPostgres(t *testing.T) (*sql.DB, string, func()) {
+	p := postgres.Preset(
+		postgres.WithVersion("12.5"),
+		postgres.WithUser("gnomock", "gnomick"),
+		postgres.WithDatabase("mydb"),
+		// 'IndexerDbByName' does this if necessary, so not needed here.
+		//postgres.WithQueriesFile("setup_postgres.sql"),
+	)
+	container, err := gnomock.Start(p)
+	assert.NoError(t, err, "Error starting gnomock")
+
+	shutdownFunc := func() {
+		err = gnomock.Stop(container)
+		assert.NoError(t, err, "Error stoping gnomock")
+	}
+
+	connStr := fmt.Sprintf(
+		"host=%s port=%d user=%s password=%s  dbname=%s sslmode=disable",
+		container.Host, container.DefaultPort(),
+		"gnomock", "gnomick", "mydb",
+	)
+
+	db, err := sql.Open("postgres", connStr)
+	assert.NoError(t, err, "Error opening pg connection")
+	return db, connStr, shutdownFunc
+}
+
+// TestMaxRoundOnUninitializedDB makes sure we return 0 when getting the max round on a new DB.
+func TestMaxRoundOnUninitializedDB(t *testing.T) {
+    _, connStr, shutdownFunc := setupPostgres(t)
+    defer shutdownFunc()
+
+    ///////////
+    // Given // A database that has not yet imported the genesis accounts.
+	///////////
+	db, err := idb.IndexerDbByName("postgres", connStr, nil, nil)
+	assert.NoError(t, err)
+
+	//////////
+	// When // We request the max round.
+	//////////
+	round, err := db.GetMaxRound()
+
+	//////////
+	// Then // There should be no error and we return that there are zero rounds.
+	//////////
+	assert.NoError(t, err)
+	assert.Equal(t, uint64(0), round)
+}
+
+// TestAssetCloseReopenTransfer tests a scenario that requires asset subround accounting
+func TestAssetCloseReopenTransfer(t *testing.T) {
+	db, connStr, shutdownFunc := setupPostgres(t)
+	defer shutdownFunc()
+
+	pdb, err := idb.IndexerDbByName("postgres", connStr, nil, nil)
+	assert.NoError(t, err)
+
+	assetid := uint64(2222)
+	amt := uint64(10000)
+
+	///////////
+	// Given // A round scenario requiring subround accounting: AccountA is funded, closed, opts back, and funded again.
+	///////////
+	_, fundMain := test.MakeAssetTxnOrPanic(test.Round, assetid, amt, test.AccountD, test.AccountA, types.ZeroAddress)
+	_, closeMain := test.MakeAssetTxnOrPanic(test.Round, assetid, 1000, test.AccountA, test.AccountB, test.AccountC)
+	_, optinMain := test.MakeAssetTxnOrPanic(test.Round, assetid, 0, test.AccountA, test.AccountA, types.ZeroAddress)
+	_, payMain := test.MakeAssetTxnOrPanic(test.Round, assetid, amt, test.AccountD, test.AccountA, types.ZeroAddress)
+
+	state := getAccounting()
+	state.AddTransaction(fundMain)
+	state.AddTransaction(closeMain)
+	state.AddTransaction(optinMain)
+	state.AddTransaction(payMain)
+
+	//////////
+	// When // We commit the round accounting to the database.
+	//////////
+	pdb.CommitRoundAccounting(state.RoundUpdates, test.Round, 0)
+
+	//////////
+	// Then // Accounts A, B, C and D have the correct balances.
+	//////////
+	var resultBalance int
+	var row *sql.Row
+
+	// AccountA should contain the final payment.
+	row = db.QueryRow(`SELECT amount FROM account_asset WHERE account_asset.assetid = $1 AND account_asset.addr = $2`, assetid, test.AccountA[:])
+	err = row.Scan(&resultBalance)
+	assert.NoError(t, err, "checking balance")
+	assert.Equal(t, int(amt), resultBalance)
+
+	// AccountB should have the asset close amount of 1000
+	row = db.QueryRow(`SELECT amount FROM account_asset WHERE account_asset.assetid = $1 AND account_asset.addr = $2`, assetid, test.AccountB[:])
+	err = row.Scan(&resultBalance)
+	assert.NoError(t, err, "checking balance")
+	assert.Equal(t, 1000, resultBalance)
+
+	// AccountC should have the remaining 9000
+	row = db.QueryRow(`SELECT amount FROM account_asset WHERE account_asset.assetid = $1 AND account_asset.addr = $2`, assetid, test.AccountC[:])
+	err = row.Scan(&resultBalance)
+	assert.NoError(t, err, "checking balance")
+	assert.Equal(t, 9000, resultBalance)
+
+	// The funding account, AccountD, should have -20000, it sent funds without ever being funded.
+	row = db.QueryRow(`SELECT amount FROM account_asset WHERE account_asset.assetid = $1 AND account_asset.addr = $2`, assetid, test.AccountD[:])
+	err = row.Scan(&resultBalance)
+	assert.NoError(t, err, "checking balance")
+	assert.Equal(t, int(amt) * -2, resultBalance)
+}
\ No newline at end of file
diff --git a/util/test/account_testutil.go b/util/test/account_testutil.go
new file mode 100644
index 0000000..caa7aaa
--- /dev/null
+++ b/util/test/account_testutil.go
@@ -0,0 +1,125 @@
+package test
+
+import (
+	"fmt"
+	"github.com/algorand/go-algorand-sdk/encoding/msgpack"
+	"github.com/algorand/go-algorand-sdk/types"
+
+	"github.com/algorand/indexer/idb"
+)
+
+// Round is the round used in pre-made transactions.
+const Round = uint64(10)
+
+var (
+	// AccountA is a premade account for use in tests.
+    AccountA = DecodeAddressOrPanic("GJR76Q6OXNZ2CYIVCFCDTJRBAAR6TYEJJENEII3G2U3JH546SPBQA62IFY")
+    // AccountB is a premade account for use in tests.
+    AccountB = DecodeAddressOrPanic("N5T74SANUWLHI6ZWYFQBEB6J2VXBTYUYZNWQB2V26DCF4ARKC7GDUW3IRU")
+    // AccountC is a premade account for use in tests.
+    AccountC = DecodeAddressOrPanic("OKUWMFFEKF4B4D7FRQYBVV3C2SNS54ZO4WZ2MJ3576UYKFDHM5P3AFMRWE")
+    // AccountD is a premade account for use in tests.
+    AccountD = DecodeAddressOrPanic("6TB2ZQA2GEEDH6XTIOH5A7FUSGINXDPW5ONN6XBOBBGGUXVHRQTITAIIVI")
+    // FeeAddr is the fee addess to use when creating the state object.
+    FeeAddr = DecodeAddressOrPanic("ZROKLZW4GVOK5WQIF2GUR6LHFVEZBMV56BIQEQD4OTIZL2BPSYYUKFBSHM")
+    // RewardAddr is the fee addess to use when creating the state object.
+    RewardAddr = DecodeAddressOrPanic("4C3S3A5II6AYMEADSW7EVL7JAKVU2ASJMMJAGVUROIJHYMS6B24NCXVEWM")
+
+	// OpenMainStxn is a premade signed transaction which may be useful in tests.
+	OpenMainStxn      *types.SignedTxnWithAD
+	// OpenMain is a premade TxnRow which may be useful in tests.
+	OpenMain          *idb.TxnRow
+
+	// CloseMainToBCStxn is a premade signed transaction which may be useful in tests.
+	CloseMainToBCStxn *types.SignedTxnWithAD
+	// CloseMainToBC is a premade TxnRow which may be useful in tests.
+	CloseMainToBC     *idb.TxnRow
+)
+
+func init() {
+	OpenMainStxn, OpenMain = MakePayTxnRowOrPanic(Round, 1000, 10234, 0, 111, 1111, 0, AccountC, AccountA, types.ZeroAddress)
+	// CloseMainToBCStxn and CloseMainToBC are premade transactions which may be useful in tests.
+	CloseMainToBCStxn, CloseMainToBC = MakePayTxnRowOrPanic(Round, 1000, 1234, 9111, 0, 111, 111, AccountA, AccountC, AccountB)
+}
+
+// DecodeAddressOrPanic is a helper to ensure addresses are initialized.
+func DecodeAddressOrPanic(addr string) types.Address {
+	if addr == "" {
+		return types.ZeroAddress
+	}
+
+	result, err := types.DecodeAddress(addr)
+	if err != nil {
+		panic(fmt.Sprintf("Failed to decode address: '%s'", addr))
+	}
+	return result
+}
+
+// MakeAssetTxnOrPanic is a helper to ensure test asset transactions are initialized.
+func MakeAssetTxnOrPanic(round, assetid, amt uint64, sender, receiver, close types.Address) (*types.SignedTxnWithAD, *idb.TxnRow) {
+	txn := types.SignedTxnWithAD{
+		SignedTxn: types.SignedTxn{
+			Txn: types.Transaction{
+				Type: "axfer",
+				Header: types.Header{
+					Sender:     sender,
+					Fee:        types.MicroAlgos(1000),
+					FirstValid: types.Round(round),
+					LastValid:  types.Round(round),
+				},
+				AssetTransferTxnFields: types.AssetTransferTxnFields{
+					XferAsset:     types.AssetIndex(assetid),
+					AssetAmount:   amt,
+					//only used for clawback transactions
+					//AssetSender:   types.Address{},
+					AssetReceiver: receiver,
+					AssetCloseTo:  close,
+				},
+			},
+		},
+		ApplyData: types.ApplyData{
+		},
+	}
+
+	txnRow := idb.TxnRow{
+		Round:    uint64(txn.Txn.FirstValid),
+		TxnBytes: msgpack.Encode(txn),
+	}
+
+	return &txn, &txnRow
+}
+
+// MakePayTxnRowOrPanic is a helper to ensure test asset transactions are initialized.
+func MakePayTxnRowOrPanic(round, fee, amt, closeAmt, sendRewards, receiveRewards, closeRewards uint64, sender, receiver, close types.Address) (*types.SignedTxnWithAD, *idb.TxnRow) {
+	txn := types.SignedTxnWithAD{
+		SignedTxn: types.SignedTxn{
+			Txn: types.Transaction{
+				Type: "pay",
+				Header: types.Header{
+					Sender:     sender,
+					Fee:        types.MicroAlgos(fee),
+					FirstValid: types.Round(round),
+					LastValid:  types.Round(round),
+				},
+				PaymentTxnFields: types.PaymentTxnFields{
+					Receiver:         receiver,
+					Amount:           types.MicroAlgos(amt),
+					CloseRemainderTo: close,
+				},
+			},
+		},
+		ApplyData: types.ApplyData{
+			ClosingAmount:   types.MicroAlgos(closeAmt),
+			SenderRewards:   types.MicroAlgos(sendRewards),
+			ReceiverRewards: types.MicroAlgos(receiveRewards),
+			CloseRewards:    types.MicroAlgos(closeRewards),
+		},
+	}
+
+	txnRow := idb.TxnRow{
+		Round:    uint64(txn.Txn.FirstValid),
+		TxnBytes: msgpack.Encode(txn),
+	}
+
+	return &txn, &txnRow
+}