Get relay fee from wallet (#47)

README.md

@@ -15,9 +15,12 @@ ticket details + fee to a VSP, and the VSP will take the fee and vote in return.
 
 ### For Administrators
 
-- bbolt db.
+- bbolt db - no database admin required.
+- Database is not used outside of dcrvsp server.
 - No stakepoold.
 - Client accountability.
+- No need to use the same wallet seed on each voting wallet.
+- Fees can change regularly - previously cached by wallet.
 
 ### For Users
 

database/database_test.go

@@ -35,9 +35,9 @@ func TestDatabase(t *testing.T) {
 
 	// All sub-tests to run.
 	tests := map[string]func(*testing.T){
-		"testInsertFeeAddress":          testInsertFeeAddress,
+		"testInsertTicket":       testInsertTicket,
 		"testGetTicketByHash":    testGetTicketByHash,
-		"testInsertFeeAddressVotingKey": testInsertFeeAddressVotingKey,
+		"testSetTicketVotingKey": testSetTicketVotingKey,
 		"testUpdateExpireAndFee": testUpdateExpireAndFee,
 		"testUpdateVoteChoices":  testUpdateVoteChoices,
 	}
@@ -63,23 +63,23 @@ func TestDatabase(t *testing.T) {
 	}
 }
 
-func testInsertFeeAddress(t *testing.T) {
+func testInsertTicket(t *testing.T) {
 	// Insert a ticket into the database.
 	ticket := exampleTicket()
-	err := db.InsertFeeAddress(ticket)
+	err := db.InsertTicket(ticket)
 	if err != nil {
 		t.Fatalf("error storing ticket in database: %v", err)
 	}
 
 	// Inserting a ticket with the same hash should fail.
-	err = db.InsertFeeAddress(ticket)
+	err = db.InsertTicket(ticket)
 	if err == nil {
 		t.Fatal("expected an error inserting ticket with duplicate hash")
 	}
 
 	// Inserting a ticket with empty hash should fail.
 	ticket.Hash = ""
-	err = db.InsertFeeAddress(ticket)
+	err = db.InsertTicket(ticket)
 	if err == nil {
 		t.Fatal("expected an error inserting ticket with no hash")
 	}
@@ -88,7 +88,7 @@ func testInsertFeeAddress(t *testing.T) {
 func testGetTicketByHash(t *testing.T) {
 	ticket := exampleTicket()
 	// Insert a ticket into the database.
-	err := db.InsertFeeAddress(ticket)
+	err := db.InsertTicket(ticket)
 	if err != nil {
 		t.Fatalf("error storing ticket in database: %v", err)
 	}
@@ -120,10 +120,10 @@ func testGetTicketByHash(t *testing.T) {
 	}
 }
 
-func testInsertFeeAddressVotingKey(t *testing.T) {
+func testSetTicketVotingKey(t *testing.T) {
 	// Insert a ticket into the database.
 	ticket := exampleTicket()
-	err := db.InsertFeeAddress(ticket)
+	err := db.InsertTicket(ticket)
 	if err != nil {
 		t.Fatalf("error storing ticket in database: %v", err)
 	}
@@ -132,7 +132,7 @@ func testInsertFeeAddressVotingKey(t *testing.T) {
 	newVotingKey := ticket.VotingKey + "2"
 	newVoteChoices := ticket.VoteChoices
 	newVoteChoices["AgendaID"] = "Different choice"
-	err = db.InsertFeeAddressVotingKey(ticket.CommitmentAddress, newVotingKey, newVoteChoices)
+	err = db.SetTicketVotingKey(ticket.Hash, newVotingKey, newVoteChoices)
 	if err != nil {
 		t.Fatalf("error updating votingkey and votechoices: %v", err)
 	}
@@ -153,7 +153,7 @@ func testInsertFeeAddressVotingKey(t *testing.T) {
 func testUpdateExpireAndFee(t *testing.T) {
 	// Insert a ticket into the database.
 	ticket := exampleTicket()
-	err := db.InsertFeeAddress(ticket)
+	err := db.InsertTicket(ticket)
 	if err != nil {
 		t.Fatalf("error storing ticket in database: %v", err)
 	}
@@ -181,7 +181,7 @@ func testUpdateExpireAndFee(t *testing.T) {
 func testUpdateVoteChoices(t *testing.T) {
 	// Insert a ticket into the database.
 	ticket := exampleTicket()
-	err := db.InsertFeeAddress(ticket)
+	err := db.InsertTicket(ticket)
 	if err != nil {
 		t.Fatalf("error storing ticket in database: %v", err)
 	}

database/ticket.go

@@ -25,7 +25,7 @@ var (
 	ErrNoTicketFound = errors.New("no ticket found")
 )
 
-func (vdb *VspDatabase) InsertFeeAddress(ticket Ticket) error {
+func (vdb *VspDatabase) InsertTicket(ticket Ticket) error {
 	hashBytes := []byte(ticket.Hash)
 	return vdb.db.Update(func(tx *bolt.Tx) error {
 		ticketBkt := tx.Bucket(vspBktK).Bucket(ticketBktK)
@@ -43,42 +43,40 @@ func (vdb *VspDatabase) InsertFeeAddress(ticket Ticket) error {
 	})
 }
 
-func (vdb *VspDatabase) InsertFeeAddressVotingKey(address, votingKey string, voteChoices map[string]string) error {
+func (vdb *VspDatabase) SetTicketVotingKey(ticketHash, votingKey string, voteChoices map[string]string) error {
 	return vdb.db.Update(func(tx *bolt.Tx) error {
 		ticketBkt := tx.Bucket(vspBktK).Bucket(ticketBktK)
-		c := ticketBkt.Cursor()
 
-		for k, v := c.First(); k != nil; k, v = c.Next() {
+		hashBytes := []byte(ticketHash)
+
+		ticketBytes := ticketBkt.Get(hashBytes)
+		if ticketBytes == nil {
+			return ErrNoTicketFound
+		}
+
 		var ticket Ticket
-			err := json.Unmarshal(v, &ticket)
+		err := json.Unmarshal(ticketBytes, &ticket)
 		if err != nil {
 			return fmt.Errorf("could not unmarshal ticket: %v", err)
 		}
 
-			if ticket.CommitmentAddress == address {
 		ticket.VotingKey = votingKey
 		ticket.VoteChoices = voteChoices
-				ticketBytes, err := json.Marshal(ticket)
+		ticketBytes, err = json.Marshal(ticket)
 		if err != nil {
-					return err
+			return fmt.Errorf("could not marshal ticket: %v", err)
-				}
-				err = ticketBkt.Put(k, ticketBytes)
-				if err != nil {
-					return err
-				}
-			}
 		}
 
-		return nil
+		return ticketBkt.Put(hashBytes, ticketBytes)
 	})
 }
 
-func (vdb *VspDatabase) GetTicketByHash(hash string) (Ticket, error) {
+func (vdb *VspDatabase) GetTicketByHash(ticketHash string) (Ticket, error) {
 	var ticket Ticket
 	err := vdb.db.View(func(tx *bolt.Tx) error {
 		ticketBkt := tx.Bucket(vspBktK).Bucket(ticketBktK)
 
-		ticketBytes := ticketBkt.Get([]byte(hash))
+		ticketBytes := ticketBkt.Get([]byte(ticketHash))
 		if ticketBytes == nil {
 			return ErrNoTicketFound
 		}
@@ -94,12 +92,12 @@ func (vdb *VspDatabase) GetTicketByHash(hash string) (Ticket, error) {
 	return ticket, err
 }
 
-func (vdb *VspDatabase) UpdateVoteChoices(hash string, voteChoices map[string]string) error {
+func (vdb *VspDatabase) UpdateVoteChoices(ticketHash string, voteChoices map[string]string) error {
 	return vdb.db.Update(func(tx *bolt.Tx) error {
 		ticketBkt := tx.Bucket(vspBktK).Bucket(ticketBktK)
-		key := []byte(hash)
+		hashBytes := []byte(ticketHash)
 
-		ticketBytes := ticketBkt.Get(key)
+		ticketBytes := ticketBkt.Get(hashBytes)
 		if ticketBytes == nil {
 			return ErrNoTicketFound
 		}
@@ -116,16 +114,16 @@ func (vdb *VspDatabase) UpdateVoteChoices(hash string, voteChoices map[string]st
 			return fmt.Errorf("could not marshal ticket: %v", err)
 		}
 
-		return ticketBkt.Put(key, ticketBytes)
+		return ticketBkt.Put(hashBytes, ticketBytes)
 	})
 }
 
-func (vdb *VspDatabase) UpdateExpireAndFee(hash string, expiration int64, vspFee float64) error {
+func (vdb *VspDatabase) UpdateExpireAndFee(ticketHash string, expiration int64, vspFee float64) error {
 	return vdb.db.Update(func(tx *bolt.Tx) error {
 		ticketBkt := tx.Bucket(vspBktK).Bucket(ticketBktK)
-		key := []byte(hash)
+		hashBytes := []byte(ticketHash)
 
-		ticketBytes := ticketBkt.Get(key)
+		ticketBytes := ticketBkt.Get(hashBytes)
 		if ticketBytes == nil {
 			return ErrNoTicketFound
 		}
@@ -143,6 +141,6 @@ func (vdb *VspDatabase) UpdateExpireAndFee(hash string, expiration int64, vspFee
 			return fmt.Errorf("could not marshal ticket: %v", err)
 		}
 
-		return ticketBkt.Put(key, ticketBytes)
+		return ticketBkt.Put(hashBytes, ticketBytes)
 	})
 }

rpc/feewallet.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	wallettypes "decred.org/dcrwallet/rpc/jsonrpc/types"
+	"github.com/decred/dcrd/dcrutil/v3"
 	dcrdtypes "github.com/decred/dcrd/rpc/jsonrpc/types/v2"
 )
 
@@ -112,3 +113,19 @@ func (c *FeeWalletRPC) SendRawTransaction(txHex string) (string, error) {
 	}
 	return txHash, nil
 }
+
+func (c *FeeWalletRPC) GetWalletFee() (dcrutil.Amount, error) {
+	var amount dcrutil.Amount
+	var feeF float64
+	err := c.Call(c.ctx, "getwalletfee", &feeF)
+	if err != nil {
+		return amount, err
+	}
+
+	amount, err = dcrutil.NewAmount(feeF)
+	if err != nil {
+		return amount, err
+	}
+
+	return amount, nil
+}

webapi/getfeeaddress.go

@@ -17,7 +17,7 @@ import (
 	"github.com/jholdstock/dcrvsp/rpc"
 )
 
-// feeAddress is the handler for "POST /feeaddress"
+// feeAddress is the handler for "POST /feeaddress".
 func feeAddress(c *gin.Context) {
 	var feeAddressRequest FeeAddressRequest
 	if err := c.ShouldBindJSON(&feeAddressRequest); err != nil {
@@ -26,7 +26,7 @@ func feeAddress(c *gin.Context) {
 		return
 	}
 
-	// ticketHash
+	// Validate TicketHash.
 	ticketHashStr := feeAddressRequest.TicketHash
 	txHash, err := chainhash.NewHashFromStr(ticketHashStr)
 	if err != nil {
@@ -35,7 +35,7 @@ func feeAddress(c *gin.Context) {
 		return
 	}
 
-	// signature - sanity check signature is in base64 encoding
+	// Validate Signature - sanity check signature is in base64 encoding.
 	signature := feeAddressRequest.Signature
 	if _, err = base64.StdEncoding.DecodeString(signature); err != nil {
 		log.Warnf("Invalid signature from %s: %v", c.ClientIP(), err)
@@ -187,9 +187,9 @@ func feeAddress(c *gin.Context) {
 		// VotingKey and VoteChoices: set during payfee
 	}
 
-	err = db.InsertFeeAddress(dbTicket)
+	err = db.InsertTicket(dbTicket)
 	if err != nil {
-		log.Errorf("InsertFeeAddress error: %v", err)
+		log.Errorf("InsertTicket error: %v", err)
 		sendErrorResponse("database error", http.StatusInternalServerError, c)
 		return
 	}

webapi/payfee.go

@@ -7,7 +7,6 @@ import (
 	"time"
 
 	"decred.org/dcrwallet/wallet/txrules"
-	"github.com/decred/dcrd/chaincfg/chainhash"
 	"github.com/decred/dcrd/dcrec"
 	"github.com/decred/dcrd/dcrutil/v3"
 	"github.com/decred/dcrd/txscript/v3"
@@ -16,7 +15,7 @@ import (
 	"github.com/jholdstock/dcrvsp/rpc"
 )
 
-// payFee is the handler for "POST /payfee"
+// payFee is the handler for "POST /payfee".
 func payFee(c *gin.Context) {
 	var payFeeRequest PayFeeRequest
 	if err := c.ShouldBindJSON(&payFeeRequest); err != nil {
@@ -25,6 +24,10 @@ func payFee(c *gin.Context) {
 		return
 	}
 
+	// TODO: Respond early if the fee tx has already been broadcast for this
+	// ticket. Maybe indicate status - mempool/awaiting confs/confirmed.
+
+	// Validate VotingKey.
 	votingKey := payFeeRequest.VotingKey
 	votingWIF, err := dcrutil.DecodeWIF(votingKey, cfg.NetParams.PrivateKeyID)
 	if err != nil {
@@ -33,6 +36,7 @@ func payFee(c *gin.Context) {
 		return
 	}
 
+	// Validate VoteChoices.
 	voteChoices := payFeeRequest.VoteChoices
 	err = isValidVoteChoices(cfg.NetParams, currentVoteVersion(cfg.NetParams), voteChoices)
 	if err != nil {
@@ -41,6 +45,7 @@ func payFee(c *gin.Context) {
 		return
 	}
 
+	// Validate FeeTx.
 	feeTxBytes, err := hex.DecodeString(payFeeRequest.FeeTx)
 	if err != nil {
 		log.Warnf("Failed to decode tx: %v", err)
@@ -56,6 +61,15 @@ func payFee(c *gin.Context) {
 		return
 	}
 
+	feeTxBuf := new(bytes.Buffer)
+	feeTxBuf.Grow(feeTx.SerializeSize())
+	err = feeTx.Serialize(feeTxBuf)
+	if err != nil {
+		log.Errorf("Serialize tx failed: %v", err)
+		sendErrorResponse("serialize tx error", http.StatusInternalServerError, c)
+		return
+	}
+
 	// TODO: DB - check expiration given during fee address request
 
 	ticket, err := db.GetTicketByHash(payFeeRequest.TicketHash)
@@ -64,6 +78,9 @@ func payFee(c *gin.Context) {
 		sendErrorResponse("invalid ticket", http.StatusBadRequest, c)
 		return
 	}
+
+	// Loop through transaction outputs until we find one which pays to the
+	// expected fee address. Record how much is being paid to the fee address.
 	var feeAmount dcrutil.Amount
 	const scriptVersion = 0
 
@@ -90,12 +107,6 @@ findAddress:
 		return
 	}
 
-	voteAddr, err := dcrutil.DecodeAddress(ticket.CommitmentAddress, cfg.NetParams)
-	if err != nil {
-		log.Errorf("DecodeAddress: %v", err)
-		sendErrorResponse("database error", http.StatusInternalServerError, c)
-		return
-	}
 	_, err = dcrutil.NewAddressPubKeyHash(dcrutil.Hash160(votingWIF.PubKey()), cfg.NetParams,
 		dcrec.STEcdsaSecp256k1)
 	if err != nil {
@@ -108,29 +119,6 @@ findAddress:
 
 	sDiff := dcrutil.Amount(ticket.SDiff)
 
-	// TODO - RPC - get relayfee from wallet
-	relayFee, err := dcrutil.NewAmount(0.0001)
-	if err != nil {
-		log.Errorf("NewAmount failed: %v", err)
-		sendErrorResponse("failed to create new amount", http.StatusInternalServerError, c)
-		return
-	}
-
-	minFee := txrules.StakePoolTicketFee(sDiff, relayFee, int32(ticket.BlockHeight), cfg.VSPFee, cfg.NetParams)
-	if feeAmount < minFee {
-		log.Errorf("Fee too small: was %v, expected %v", feeAmount, minFee)
-		sendErrorResponse("fee too small", http.StatusInternalServerError, c)
-		return
-	}
-
-	// Get vote tx to give to wallet
-	ticketHash, err := chainhash.NewHashFromStr(ticket.Hash)
-	if err != nil {
-		log.Errorf("NewHashFromStr failed: %v", err)
-		sendErrorResponse("failed to create hash", http.StatusInternalServerError, c)
-		return
-	}
-
 	fWalletConn, err := feeWalletConnect()
 	if err != nil {
 		log.Errorf("Fee wallet connection error: %v", err)
@@ -146,9 +134,45 @@ findAddress:
 		return
 	}
 
-	rawTicket, err := fWalletClient.GetRawTransaction(ticketHash.String())
+	relayFee, err := fWalletClient.GetWalletFee()
 	if err != nil {
-		log.Warnf("Could not retrieve tx %s for %s: %v", ticketHash.String(), c.ClientIP(), err)
+		log.Errorf("GetWalletFee failed: %v", err)
+		sendErrorResponse("dcrwallet RPC error", http.StatusInternalServerError, c)
+		return
+	}
+
+	minFee := txrules.StakePoolTicketFee(sDiff, relayFee, int32(ticket.BlockHeight), cfg.VSPFee, cfg.NetParams)
+	if feeAmount < minFee {
+		log.Errorf("Fee too small: was %v, expected %v", feeAmount, minFee)
+		sendErrorResponse("fee too small", http.StatusInternalServerError, c)
+		return
+	}
+
+	// At this point we are satisfied that the request is valid and the FeeTx
+	// pays sufficient fees to the expected address.
+	// Proceed to update the database and broadcast the transaction.
+
+	err = db.SetTicketVotingKey(ticket.Hash, votingWIF.String(), voteChoices)
+	if err != nil {
+		log.Errorf("SetTicketVotingKey failed: %v", err)
+		sendErrorResponse("database error", http.StatusInternalServerError, c)
+		return
+	}
+
+	sendTxHash, err := fWalletClient.SendRawTransaction(hex.EncodeToString(feeTxBuf.Bytes()))
+	if err != nil {
+		log.Errorf("SendRawTransaction failed: %v", err)
+		sendErrorResponse("dcrwallet RPC error", http.StatusInternalServerError, c)
+		return
+	}
+
+	// TODO: Should return a response here. We don't want to add the ticket to
+	// the voting wallets until the fee tx has been confirmed.
+
+	// Add ticket to voting wallets.
+	rawTicket, err := fWalletClient.GetRawTransaction(ticket.Hash)
+	if err != nil {
+		log.Warnf("Could not retrieve tx %s for %s: %v", ticket.Hash, c.ClientIP(), err)
 		sendErrorResponse("unknown transaction", http.StatusBadRequest, c)
 		return
 	}
@@ -190,29 +214,6 @@ findAddress:
 		}
 	}
 
-	feeTxBuf := new(bytes.Buffer)
-	feeTxBuf.Grow(feeTx.SerializeSize())
-	err = feeTx.Serialize(feeTxBuf)
-	if err != nil {
-		log.Errorf("Serialize tx failed: %v", err)
-		sendErrorResponse("serialize tx error", http.StatusInternalServerError, c)
-		return
-	}
-
-	sendTxHash, err := fWalletClient.SendRawTransaction(hex.EncodeToString(feeTxBuf.Bytes()))
-	if err != nil {
-		log.Errorf("SendRawTransaction failed: %v", err)
-		sendErrorResponse("dcrwallet RPC error", http.StatusInternalServerError, c)
-		return
-	}
-
-	err = db.InsertFeeAddressVotingKey(voteAddr.Address(), votingWIF.String(), voteChoices)
-	if err != nil {
-		log.Errorf("InsertFeeAddressVotingKey failed: %v", err)
-		sendErrorResponse("database error", http.StatusInternalServerError, c)
-		return
-	}
-
 	sendJSONResponse(payFeeResponse{
 		Timestamp: time.Now().Unix(),
 		TxHash:    sendTxHash,

webapi/setvotechoices.go

@@ -12,7 +12,7 @@ import (
 	"github.com/jholdstock/dcrvsp/rpc"
 )
 
-// setVoteChoices is the handler for "POST /setvotechoices"
+// setVoteChoices is the handler for "POST /setvotechoices".
 func setVoteChoices(c *gin.Context) {
 	var setVoteChoicesRequest SetVoteChoicesRequest
 	if err := c.ShouldBindJSON(&setVoteChoicesRequest); err != nil {
@@ -21,7 +21,7 @@ func setVoteChoices(c *gin.Context) {
 		return
 	}
 
-	// ticketHash
+	// Validate TicketHash.
 	ticketHashStr := setVoteChoicesRequest.TicketHash
 	txHash, err := chainhash.NewHashFromStr(ticketHashStr)
 	if err != nil {
@@ -30,7 +30,7 @@ func setVoteChoices(c *gin.Context) {
 		return
 	}
 
-	// signature - sanity check signature is in base64 encoding
+	// Validate Signature - sanity check signature is in base64 encoding.
 	signature := setVoteChoicesRequest.Signature
 	if _, err = base64.StdEncoding.DecodeString(signature); err != nil {
 		log.Warnf("Invalid signature from %s: %v", c.ClientIP(), err)

webapi/status.go

@@ -6,7 +6,7 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-// pubKey is the handler for "GET /pubkey"
+// pubKey is the handler for "GET /pubkey".
 func pubKey(c *gin.Context) {
 	sendJSONResponse(pubKeyResponse{
 		Timestamp: time.Now().Unix(),
@@ -14,7 +14,7 @@ func pubKey(c *gin.Context) {
 	}, c)
 }
 
-// fee is the handler for "GET /fee"
+// fee is the handler for "GET /fee".
 func fee(c *gin.Context) {
 	sendJSONResponse(feeResponse{
 		Timestamp: time.Now().Unix(),

webapi/ticketstatus.go

@@ -11,7 +11,7 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-// ticketStatus is the handler for "GET /ticketstatus"
+// ticketStatus is the handler for "GET /ticketstatus".
 func ticketStatus(c *gin.Context) {
 	var ticketStatusRequest TicketStatusRequest
 	if err := c.ShouldBindJSON(&ticketStatusRequest); err != nil {
@@ -20,7 +20,7 @@ func ticketStatus(c *gin.Context) {
 		return
 	}
 
-	// ticketHash
+	// Validate TicketHash.
 	ticketHashStr := ticketStatusRequest.TicketHash
 	_, err := chainhash.NewHashFromStr(ticketHashStr)
 	if err != nil {
@@ -29,7 +29,7 @@ func ticketStatus(c *gin.Context) {
 		return
 	}
 
-	// signature - sanity check signature is in base64 encoding
+	// Validate Signature - sanity check signature is in base64 encoding.
 	signature := ticketStatusRequest.Signature
 	if _, err = base64.StdEncoding.DecodeString(signature); err != nil {
 		log.Warnf("Invalid signature from %s: %v", c.ClientIP(), err)