Create-on-send flows for withdrawals

Author: Jeff Yanta

go.mod

@@ -5,7 +5,7 @@ go 1.23.0
 require (
 	github.com/aws/aws-sdk-go-v2 v0.17.0
 	github.com/bits-and-blooms/bloom/v3 v3.1.0
-	github.com/code-payments/code-protobuf-api v1.19.1-0.20250602171721-c057e3310d81
+	github.com/code-payments/code-protobuf-api v1.19.1-0.20250603030803-cbe2bfca5052
 	github.com/code-payments/code-vm-indexer v0.1.11-0.20241028132209-23031e814fba
 	github.com/emirpasic/gods v1.12.0
 	github.com/envoyproxy/protoc-gen-validate v1.2.1

go.sum

@@ -78,8 +78,8 @@ github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnht
 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/cockroachdb/apd v1.1.0 h1:3LFP3629v+1aKXU5Q37mxmRxX/pIu1nijXydLShEq5I=
 github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ=
-github.com/code-payments/code-protobuf-api v1.19.1-0.20250602171721-c057e3310d81 h1:sX2VijdiCok3hJI1Yv/a+NslvVzCTolpNDQIOFzk9DE=
-github.com/code-payments/code-protobuf-api v1.19.1-0.20250602171721-c057e3310d81/go.mod h1:ee6TzKbgMS42ZJgaFEMG3c4R3dGOiffHSu6MrY7WQvs=
+github.com/code-payments/code-protobuf-api v1.19.1-0.20250603030803-cbe2bfca5052 h1:lfxaakPHAWFPukrqsUn8nYdpw1WaXQfP4KLCzmL8UxU=
+github.com/code-payments/code-protobuf-api v1.19.1-0.20250603030803-cbe2bfca5052/go.mod h1:ee6TzKbgMS42ZJgaFEMG3c4R3dGOiffHSu6MrY7WQvs=
 github.com/code-payments/code-vm-indexer v0.1.11-0.20241028132209-23031e814fba h1:Bkp+gmeb6Y2PWXfkSCTMBGWkb2P1BujRDSjWeI+0j5I=
 github.com/code-payments/code-vm-indexer v0.1.11-0.20241028132209-23031e814fba/go.mod h1:jSiifpiBpyBQ8q2R0MGEbkSgWC6sbdRTyDBntmW+j1E=
 github.com/containerd/continuity v0.0.0-20190827140505-75bee3e2ccb6 h1:NmTXa/uVnDyp0TY5MKi197+3HWcnYWfnHGyaFthlnGw=

pkg/code/async/sequencer/fulfillment_handler.go

@@ -7,6 +7,7 @@ import (
 	"github.com/mr-tron/base58"
 
 	commonpb "github.com/code-payments/code-protobuf-api/generated/go/common/v1"
+	transactionpb "github.com/code-payments/code-protobuf-api/generated/go/transaction/v2"
 	indexerpb "github.com/code-payments/code-vm-indexer/generated/indexer/v1"
 
 	"github.com/code-payments/code-server/pkg/code/common"
@@ -209,20 +210,35 @@ func (h *NoPrivacyTransferWithAuthorityFulfillmentHandler) CanSubmitToBlockchain
 
 	// The source user account is a Code account, so we must validate it exists on
 	// the blockchain prior to sending funds from it.
-	isSourceAccountCreated, err := isTokenAccountOnBlockchain(ctx, h.data, fulfillmentRecord.Source)
+	isSourceAccountCreated, err := isAccountInitialized(ctx, h.data, fulfillmentRecord.Source)
 	if err != nil {
 		return false, err
 	} else if !isSourceAccountCreated {
 		return false, nil
 	}
 
 	// The destination user account might be a Code account or external wallet, so we
-	// must validate it exists on the blockchain prior to send funds to it.
-	isDestinationAccountCreated, err := isTokenAccountOnBlockchain(ctx, h.data, *fulfillmentRecord.Destination)
+	// must validate it exists on the blockchain prior to sending funds to it, or if we'll
+	// be creating it at time of send.
+	destinationAccount, err := common.NewAccountFromPublicKeyString(*fulfillmentRecord.Destination)
 	if err != nil {
 		return false, err
-	} else if !isDestinationAccountCreated {
-		return false, nil
+	}
+	isInternalTransfer, err := isInternalVmTransfer(ctx, h.data, destinationAccount)
+	if err != nil {
+		return false, err
+	}
+	hasCreateOnSendFee, err := h.data.HasFeeAction(ctx, fulfillmentRecord.Intent, transactionpb.FeePaymentAction_CREATE_ON_SEND_WITHDRAWAL)
+	if err != nil {
+		return false, err
+	}
+	if isInternalTransfer || !hasCreateOnSendFee {
+		isDestinationAccountCreated, err := isAccountInitialized(ctx, h.data, *fulfillmentRecord.Destination)
+		if err != nil {
+			return false, err
+		} else if !isDestinationAccountCreated {
+			return false, nil
+		}
 	}
 
 	// Check whether there's an earlier fulfillment that should be scheduled first
@@ -269,17 +285,17 @@ func (h *NoPrivacyTransferWithAuthorityFulfillmentHandler) SupportsOnDemandTrans
 }
 
 func (h *NoPrivacyTransferWithAuthorityFulfillmentHandler) MakeOnDemandTransaction(ctx context.Context, fulfillmentRecord *fulfillment.Record, selectedNonce *transaction_util.Nonce) (*solana.Transaction, error) {
-	virtualSignatureBytes, err := base58.Decode(*fulfillmentRecord.VirtualSignature)
+	actionRecord, err := h.data.GetActionById(ctx, fulfillmentRecord.Intent, fulfillmentRecord.ActionId)
 	if err != nil {
 		return nil, err
 	}
 
-	virtualNonce, err := common.NewAccountFromPublicKeyString(*fulfillmentRecord.VirtualNonce)
+	virtualSignatureBytes, err := base58.Decode(*fulfillmentRecord.VirtualSignature)
 	if err != nil {
 		return nil, err
 	}
 
-	actionRecord, err := h.data.GetActionById(ctx, fulfillmentRecord.Intent, fulfillmentRecord.ActionId)
+	virtualNonce, err := common.NewAccountFromPublicKeyString(*fulfillmentRecord.VirtualNonce)
 	if err != nil {
 		return nil, err
 	}
@@ -354,6 +370,24 @@ func (h *NoPrivacyTransferWithAuthorityFulfillmentHandler) MakeOnDemandTransacti
 			*actionRecord.Quantity,
 		)
 	} else {
+		isCreateOnSend, err := h.data.HasFeeAction(ctx, fulfillmentRecord.Intent, transactionpb.FeePaymentAction_CREATE_ON_SEND_WITHDRAWAL)
+		if err != nil {
+			return &solana.Transaction{}, err
+		}
+
+		var destinationOwnerAccount *common.Account
+		if isCreateOnSend {
+			intentRecord, err := h.data.GetIntent(ctx, fulfillmentRecord.Intent)
+			if err != nil {
+				return nil, err
+			}
+
+			destinationOwnerAccount, err = common.NewAccountFromPublicKeyString(intentRecord.SendPublicPaymentMetadata.DestinationOwnerAccount)
+			if err != nil {
+				return nil, err
+			}
+		}
+
 		txn, makeTxnErr = transaction_util.MakeExternalTransferWithAuthorityTransaction(
 			selectedNonce.Account,
 			selectedNonce.Blockhash,
@@ -368,7 +402,10 @@ func (h *NoPrivacyTransferWithAuthorityFulfillmentHandler) MakeOnDemandTransacti
 			sourceMemory,
 			sourceIndex,
 
+			isCreateOnSend,
+			destinationOwnerAccount,
 			destinationTokenAccount,
+
 			*actionRecord.Quantity,
 		)
 	}
@@ -397,7 +434,7 @@ func (h *NoPrivacyWithdrawFulfillmentHandler) CanSubmitToBlockchain(ctx context.
 
 	// The source user account is a Code account, so we must validate it exists on
 	// the blockchain prior to sending funds from it.
-	isSourceAccountCreated, err := isTokenAccountOnBlockchain(ctx, h.data, fulfillmentRecord.Source)
+	isSourceAccountCreated, err := isAccountInitialized(ctx, h.data, fulfillmentRecord.Source)
 	if err != nil {
 		return false, err
 	} else if !isSourceAccountCreated {
@@ -406,7 +443,7 @@ func (h *NoPrivacyWithdrawFulfillmentHandler) CanSubmitToBlockchain(ctx context.
 
 	// The destination user account might be a Code account or external wallet, so we
 	// must validate it exists on the blockchain prior to send funds to it.
-	isDestinationAccountCreated, err := isTokenAccountOnBlockchain(ctx, h.data, *fulfillmentRecord.Destination)
+	isDestinationAccountCreated, err := isAccountInitialized(ctx, h.data, *fulfillmentRecord.Destination)
 	if err != nil {
 		return false, err
 	} else if !isDestinationAccountCreated {
@@ -700,7 +737,6 @@ func (h *CloseEmptyTimelockAccountFulfillmentHandler) OnFailure(ctx context.Cont
 	// is dust in the account.
 	//
 	// todo: Implement auto-recovery when we know the account is empty
-	// todo: Do "something" to indicate the client needs to resign a new transaction
 	return false, nil
 }
 
@@ -712,7 +748,7 @@ func (h *CloseEmptyTimelockAccountFulfillmentHandler) IsRevoked(ctx context.Cont
 	return false, false, nil
 }
 
-func isTokenAccountOnBlockchain(ctx context.Context, data code_data.Provider, address string) (bool, error) {
+func isAccountInitialized(ctx context.Context, data code_data.Provider, address string) (bool, error) {
 	// Try our cache of Code timelock accounts
 	timelockRecord, err := data.GetTimelockByVault(ctx, address)
 	if err == timelock.ErrTimelockNotFound {

pkg/code/async/sequencer/intent_handler.go

@@ -38,10 +38,6 @@ func (h *OpenAccountsIntentHandler) OnActionUpdated(ctx context.Context, intentI
 	}
 
 	for _, actionRecord := range actionRecords {
-		if actionRecord.ActionType != action.OpenAccount {
-			continue
-		}
-
 		// Intent is failed if at least one OpenAccount action fails
 		if actionRecord.State == action.StateFailed {
 			return markIntentFailed(ctx, h.data, intentId)
@@ -73,11 +69,11 @@ func (h *SendPublicPaymentIntentHandler) OnActionUpdated(ctx context.Context, in
 	}
 
 	actionRecordsToCheck := actionRecords
-	if len(actionRecords) > 1 {
+	if len(actionRecords) > 2 {
 		// Do not include the auto-return action, which is a different server-side
 		// initiated intent using the final action here.
 		//
-		// todo: Assumes > 1 case is just remote send
+		// todo: Assumes > 2 case is just remote send, but saves a DB call
 		actionRecordsToCheck = actionRecordsToCheck[:len(actionRecordsToCheck)-1]
 	}
 

pkg/code/common/account.go

@@ -451,7 +451,7 @@ func ValidateExternalTokenAccount(ctx context.Context, data code_data.Provider,
 	default:
 		// Unfortunate if Solana is down, but this only impacts withdraw flows,
 		// and we need to guarantee this isn't going to something that's not
-		// a Kin token acocunt.
+		// a core mint token acocunt.
 		return false, "", err
 	}
 }

pkg/code/common/subsidizer.go

@@ -30,18 +30,15 @@ const (
 )
 
 // todo: doesn't consider external deposits
+// todo: need a better system given fees are dynamic, we'll consider the worst case for each fulfillment type to be safe
 var (
-	// This doesn't account for recovery of rent, which implies some fulfillments
-	// actually have negative fees. We often need to think about "in flight" costs
-	// and SOL balances for our subsidizer, so we exclude rent recovery which
-	// ensures our estimates are always on the conservative side of things.
 	lamportsByFulfillment = map[fulfillment.Type]uint64{
-		fulfillment.InitializeLockedTimelockAccount: 5000, // 0.000005 SOL (5000 lamports per signature)
-		fulfillment.NoPrivacyTransferWithAuthority:  5000, // 0.000005 SOL (5000 lamports per signature)
-		fulfillment.NoPrivacyWithdraw:               5000, // 0.000005 SOL (5000 lamports per signature)
-		fulfillment.CloseEmptyTimelockAccount:       5000, // 0.000005 SOL (5000 lamports per signature)
+		fulfillment.InitializeLockedTimelockAccount: 5050,
+		fulfillment.NoPrivacyTransferWithAuthority:  203928 + 5125,
+		fulfillment.NoPrivacyWithdraw:               5100,
+		fulfillment.CloseEmptyTimelockAccount:       5100,
 	}
-	lamportsPerCreateNonceAccount uint64 = 1450000 // 0.00145 SOL
+	lamportsPerCreateNonceAccount uint64 = 1450000
 )
 
 var (

pkg/code/data/action/action.go

@@ -4,6 +4,8 @@ import (
 	"errors"
 	"time"
 
+	transactionpb "github.com/code-payments/code-protobuf-api/generated/go/transaction/v2"
+
 	"github.com/code-payments/code-server/pkg/code/data/intent"
 	"github.com/code-payments/code-server/pkg/pointer"
 )
@@ -49,7 +51,7 @@ type Record struct {
 	Source      string  // Source token account involved
 	Destination *string // Destination token account involved, when it makes sense
 
-	// Kin quark amount involved, when it makes sense. This must be set for actions
+	// Core mint quark amount involved, when it makes sense. This must be set for actions
 	// that make balance changes across Code accounts! For deferred actions that are
 	// initially in the unknown state, the balance may be nil and updated at a later
 	// time. Store implementations will enforce which actions will allow quantity updates.
@@ -60,6 +62,8 @@ type Record struct {
 	//       use cases before forming a firm opinion.
 	Quantity *uint64
 
+	FeeType *transactionpb.FeePaymentAction_FeeType
+
 	State State
 
 	CreatedAt time.Time
@@ -92,6 +96,10 @@ func (r *Record) Validate() error {
 		return errors.New("quantity is required when set")
 	}
 
+	if r.FeeType != nil && *r.FeeType == transactionpb.FeePaymentAction_UNKNOWN {
+		return errors.New("fee type is required when set")
+	}
+
 	return nil
 }
 
@@ -109,6 +117,8 @@ func (r *Record) Clone() Record {
 		Destination: pointer.StringCopy(r.Destination),
 		Quantity:    pointer.Uint64Copy(r.Quantity),
 
+		FeeType: (*transactionpb.FeePaymentAction_FeeType)(pointer.Int32Copy((*int32)(r.FeeType))),
+
 		State: r.State,
 
 		CreatedAt: r.CreatedAt,
@@ -125,8 +135,10 @@ func (r *Record) CopyTo(dst *Record) {
 	dst.ActionType = r.ActionType
 
 	dst.Source = r.Source
-	dst.Destination = r.Destination
-	dst.Quantity = r.Quantity
+	dst.Destination = pointer.StringCopy(r.Destination)
+	dst.Quantity = pointer.Uint64Copy(r.Quantity)
+
+	dst.FeeType = (*transactionpb.FeePaymentAction_FeeType)(pointer.Int32Copy((*int32)(r.FeeType)))
 
 	dst.State = r.State
 

pkg/code/data/action/memory/store.go

@@ -6,6 +6,8 @@ import (
 	"sync"
 	"time"
 
+	transactionpb "github.com/code-payments/code-protobuf-api/generated/go/transaction/v2"
+
 	"github.com/code-payments/code-server/pkg/code/data/action"
 	"github.com/code-payments/code-server/pkg/code/data/intent"
 	"github.com/code-payments/code-server/pkg/pointer"
@@ -111,6 +113,22 @@ func (s *store) filterByActionType(items []*action.Record, want action.Type) []*
 	return res
 }
 
+func (s *store) filterByFeeType(items []*action.Record, want transactionpb.FeePaymentAction_FeeType) []*action.Record {
+	var res []*action.Record
+
+	for _, item := range items {
+		if item.FeeType == nil {
+			continue
+		}
+
+		if *item.FeeType == want {
+			res = append(res, item)
+		}
+	}
+
+	return res
+}
+
 func (s *store) filterByState(items []*action.Record, include bool, states ...action.State) []*action.Record {
 	var res []*action.Record
 
@@ -295,6 +313,17 @@ func (s *store) GetGiftCardAutoReturnAction(ctx context.Context, giftCardVault s
 	return &cloned, nil
 }
 
+// CountFeeActions implements action.store.CountFeeActions
+func (s *store) CountFeeActions(ctx context.Context, intent string, feeType transactionpb.FeePaymentAction_FeeType) (uint64, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	items := s.findByIntent(intent)
+	items = s.filterByFeeType(items, feeType)
+	items = s.filterByState(items, false, action.StateRevoked)
+	return uint64(len(items)), nil
+}
+
 func (s *store) getNetBalance(account string) int64 {
 	var res int64