fix vendor folder

vendor/github.com/btcsuite/btcd/btcec/btcec.go

@@ -36,10 +36,17 @@ var (
 // interface from crypto/elliptic.
 type KoblitzCurve struct {
 	*elliptic.CurveParams
-	q         *big.Int
+
+	// q is the value (P+1)/4 used to compute the square root of field
+	// elements.
+	q *big.Int
+
 	H         int      // cofactor of the curve.
 	halfOrder *big.Int // half the order N
 
+	// fieldB is the constant B of the curve as a fieldVal.
+	fieldB *fieldVal
+
 	// byteSize is simply the bit size / 8 and is provided for convenience
 	// since it is calculated repeatedly.
 	byteSize int
@@ -879,12 +886,22 @@ func (curve *KoblitzCurve) ScalarBaseMult(k []byte) (*big.Int, *big.Int) {
 	return curve.fieldJacobianToBigAffine(qx, qy, qz)
 }
 
-// QPlus1Div4 returns the Q+1/4 constant for the curve for use in calculating
-// square roots via exponention.
+// QPlus1Div4 returns the (P+1)/4 constant for the curve for use in calculating
+// square roots via exponentiation.
+//
+// DEPRECATED: The actual value returned is (P+1)/4, where as the original
+// method name implies that this value is (((P+1)/4)+1)/4. This method is kept
+// to maintain backwards compatibility of the API. Use Q() instead.
 func (curve *KoblitzCurve) QPlus1Div4() *big.Int {
 	return curve.q
 }
 
+// Q returns the (P+1)/4 constant for the curve for use in calculating square
+// roots via exponentiation.
+func (curve *KoblitzCurve) Q() *big.Int {
+	return curve.q
+}
+
 var initonce sync.Once
 var secp256k1 KoblitzCurve
 
@@ -917,6 +934,7 @@ func initS256() {
 		big.NewInt(1)), big.NewInt(4))
 	secp256k1.H = 1
 	secp256k1.halfOrder = new(big.Int).Rsh(secp256k1.N, 1)
+	secp256k1.fieldB = new(fieldVal).SetByteSlice(secp256k1.B.Bytes())
 
 	// Provided for convenience since this gets computed repeatedly.
 	secp256k1.byteSize = secp256k1.BitSize / 8

vendor/github.com/btcsuite/btcd/btcec/field.go

@@ -102,6 +102,20 @@ const (
 	fieldPrimeWordOne = 0x3ffffbf
 )
 
+var (
+	// fieldQBytes is the value Q = (P+1)/4 for the secp256k1 prime P. This
+	// value is used to efficiently compute the square root of values in the
+	// field via exponentiation. The value of Q in hex is:
+	//
+	//   Q = 3fffffffffffffffffffffffffffffffffffffffffffffffffffffffbfffff0c
+	fieldQBytes = []byte{
+		0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xbf, 0xff, 0xff, 0x0c,
+	}
+)
+
 // fieldVal implements optimized fixed-precision arithmetic over the
 // secp256k1 finite field.  This means all arithmetic is performed modulo
 // 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f.  It
@@ -1221,3 +1235,118 @@ func (f *fieldVal) Inverse() *fieldVal {
 	f.Square().Square().Square().Square().Square() // f = a^(2^256 - 4294968320)
 	return f.Mul(&a45)                             // f = a^(2^256 - 4294968275) = a^(p-2)
 }
+
+// SqrtVal computes the square root of x modulo the curve's prime, and stores
+// the result in f. The square root is computed via exponentiation of x by the
+// value Q = (P+1)/4 using the curve's precomputed big-endian representation of
+// the Q.  This method uses a modified version of square-and-multiply
+// exponentiation over secp256k1 fieldVals to operate on bytes instead of bits,
+// which offers better performance over both big.Int exponentiation and bit-wise
+// square-and-multiply.
+//
+// NOTE: This method only works when P is intended to be the secp256k1 prime and
+// is not constant time. The returned value is of magnitude 1, but is
+// denormalized.
+func (f *fieldVal) SqrtVal(x *fieldVal) *fieldVal {
+	// The following computation iteratively computes x^((P+1)/4) = x^Q
+	// using the recursive, piece-wise definition:
+	//
+	//   x^n = (x^2)^(n/2) mod P       if n is even
+	//   x^n = x(x^2)^(n-1/2) mod P    if n is odd
+	//
+	// Given n in its big-endian representation b_k, ..., b_0, x^n can be
+	// computed by defining the sequence r_k+1, ..., r_0, where:
+	//
+	//   r_k+1 = 1
+	//   r_i   = (r_i+1)^2 * x^b_i    for i = k, ..., 0
+	//
+	// The final value r_0 = x^n.
+	//
+	// See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more
+	// details.
+	//
+	// This can be further optimized, by observing that the value of Q in
+	// secp256k1 has the value:
+	//
+	//   Q = 3fffffffffffffffffffffffffffffffffffffffffffffffffffffffbfffff0c
+	//
+	// We can unroll the typical bit-wise interpretation of the
+	// exponentiation algorithm above to instead operate on bytes.
+	// This reduces the number of comparisons by an order of magnitude,
+	// reducing the overhead of failed branch predictions and additional
+	// comparisons in this method.
+	//
+	// Since there there are only 4 unique bytes of Q, this keeps the jump
+	// table small without the need to handle all possible 8-bit values.
+	// Further, we observe that 29 of the 32 bytes are 0xff; making the
+	// first case handle 0xff therefore optimizes the hot path.
+	f.SetInt(1)
+	for _, b := range fieldQBytes {
+		switch b {
+
+		// Most common case, where all 8 bits are set.
+		case 0xff:
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+
+		// First byte of Q (0x3f), where all but the top two bits are
+		// set. Note that this case only applies six operations, since
+		// the highest bit of Q resides in bit six of the first byte. We
+		// ignore the first two bits, since squaring for these bits will
+		// result in an invalid result. We forgo squaring f before the
+		// first multiply, since 1^2 = 1.
+		case 0x3f:
+			f.Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+
+		// Byte 28 of Q (0xbf), where only bit 7 is unset.
+		case 0xbf:
+			f.Square().Mul(x)
+			f.Square()
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+
+		// Byte 31 of Q (0x0c), where only bits 3 and 4 are set.
+		default:
+			f.Square()
+			f.Square()
+			f.Square()
+			f.Square()
+			f.Square().Mul(x)
+			f.Square().Mul(x)
+			f.Square()
+			f.Square()
+		}
+	}
+
+	return f
+}
+
+// Sqrt computes the square root of f modulo the curve's prime, and stores the
+// result in f. The square root is computed via exponentiation of x by the value
+// Q = (P+1)/4 using the curve's precomputed big-endian representation of the Q.
+// This method uses a modified version of square-and-multiply exponentiation
+// over secp256k1 fieldVals to operate on bytes instead of bits, which offers
+// better performance over both big.Int exponentiation and bit-wise
+// square-and-multiply.
+//
+// NOTE: This method only works when P is intended to be the secp256k1 prime and
+// is not constant time. The returned value is of magnitude 1, but is
+// denormalized.
+func (f *fieldVal) Sqrt() *fieldVal {
+	return f.SqrtVal(f)
+}

vendor/github.com/btcsuite/btcd/btcec/genprecomps.go

@@ -1,63 +0,0 @@
-// Copyright 2015 The btcsuite developers
-// Use of this source code is governed by an ISC
-// license that can be found in the LICENSE file.
-
-// This file is ignored during the regular build due to the following build tag.
-// It is called by go generate and used to automatically generate pre-computed
-// tables used to accelerate operations.
-// +build ignore
-
-package main
-
-import (
-	"bytes"
-	"compress/zlib"
-	"encoding/base64"
-	"fmt"
-	"log"
-	"os"
-
-	"github.com/btcsuite/btcd/btcec"
-)
-
-func main() {
-	fi, err := os.Create("secp256k1.go")
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer fi.Close()
-
-	// Compress the serialized byte points.
-	serialized := btcec.S256().SerializedBytePoints()
-	var compressed bytes.Buffer
-	w := zlib.NewWriter(&compressed)
-	if _, err := w.Write(serialized); err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-	w.Close()
-
-	// Encode the compressed byte points with base64.
-	encoded := make([]byte, base64.StdEncoding.EncodedLen(compressed.Len()))
-	base64.StdEncoding.Encode(encoded, compressed.Bytes())
-
-	fmt.Fprintln(fi, "// Copyright (c) 2015 The btcsuite developers")
-	fmt.Fprintln(fi, "// Use of this source code is governed by an ISC")
-	fmt.Fprintln(fi, "// license that can be found in the LICENSE file.")
-	fmt.Fprintln(fi)
-	fmt.Fprintln(fi, "package btcec")
-	fmt.Fprintln(fi)
-	fmt.Fprintln(fi, "// Auto-generated file (see genprecomps.go)")
-	fmt.Fprintln(fi, "// DO NOT EDIT")
-	fmt.Fprintln(fi)
-	fmt.Fprintf(fi, "var secp256k1BytePoints = %q\n", string(encoded))
-
-	a1, b1, a2, b2 := btcec.S256().EndomorphismVectors()
-	fmt.Println("The following values are the computed linearly " +
-		"independent vectors needed to make use of the secp256k1 " +
-		"endomorphism:")
-	fmt.Printf("a1: %x\n", a1)
-	fmt.Printf("b1: %x\n", b1)
-	fmt.Printf("a2: %x\n", a2)
-	fmt.Printf("b2: %x\n", b2)
-}

vendor/github.com/btcsuite/btcd/btcec/pubkey.go

@@ -22,41 +22,40 @@ func isOdd(a *big.Int) bool {
 	return a.Bit(0) == 1
 }
 
-// decompressPoint decompresses a point on the given curve given the X point and
+// decompressPoint decompresses a point on the secp256k1 curve given the X point and
 // the solution to use.
-func decompressPoint(curve *KoblitzCurve, x *big.Int, ybit bool) (*big.Int, error) {
-	// TODO: This will probably only work for secp256k1 due to
-	// optimizations.
+func decompressPoint(curve *KoblitzCurve, bigX *big.Int, ybit bool) (*big.Int, error) {
+	var x fieldVal
+	x.SetByteSlice(bigX.Bytes())
 
-	// Y = +-sqrt(x^3 + B)
-	x3 := new(big.Int).Mul(x, x)
-	x3.Mul(x3, x)
-	x3.Add(x3, curve.Params().B)
-	x3.Mod(x3, curve.Params().P)
+	// Compute x^3 + B mod p.
+	var x3 fieldVal
+	x3.SquareVal(&x).Mul(&x)
+	x3.Add(curve.fieldB).Normalize()
 
 	// Now calculate sqrt mod p of x^3 + B
 	// This code used to do a full sqrt based on tonelli/shanks,
 	// but this was replaced by the algorithms referenced in
 	// https://bitcointalk.org/index.php?topic=162805.msg1712294#msg1712294
-	y := new(big.Int).Exp(x3, curve.QPlus1Div4(), curve.Params().P)
-
-	if ybit != isOdd(y) {
-		y.Sub(curve.Params().P, y)
+	var y fieldVal
+	y.SqrtVal(&x3).Normalize()
+	if ybit != y.IsOdd() {
+		y.Negate(1).Normalize()
 	}
 
 	// Check that y is a square root of x^3 + B.
-	y2 := new(big.Int).Mul(y, y)
-	y2.Mod(y2, curve.Params().P)
-	if y2.Cmp(x3) != 0 {
+	var y2 fieldVal
+	y2.SquareVal(&y).Normalize()
+	if !y2.Equals(&x3) {
 		return nil, fmt.Errorf("invalid square root")
 	}
 
 	// Verify that y-coord has expected parity.
-	if ybit != isOdd(y) {
+	if ybit != y.IsOdd() {
 		return nil, fmt.Errorf("ybit doesn't match oddness")
 	}
 
-	return y, nil
+	return new(big.Int).SetBytes(y.Bytes()[:]), nil
 }
 
 const (
@@ -102,6 +101,17 @@ func ParsePubKey(pubKeyStr []byte, curve *KoblitzCurve) (key *PublicKey, err err
 		if format == pubkeyHybrid && ybit != isOdd(pubkey.Y) {
 			return nil, fmt.Errorf("ybit doesn't match oddness")
 		}
+
+		if pubkey.X.Cmp(pubkey.Curve.Params().P) >= 0 {
+			return nil, fmt.Errorf("pubkey X parameter is >= to P")
+		}
+		if pubkey.Y.Cmp(pubkey.Curve.Params().P) >= 0 {
+			return nil, fmt.Errorf("pubkey Y parameter is >= to P")
+		}
+		if !pubkey.Curve.IsOnCurve(pubkey.X, pubkey.Y) {
+			return nil, fmt.Errorf("pubkey isn't on secp256k1 curve")
+		}
+
 	case PubKeyBytesLenCompressed:
 		// format is 0x2 | solution, <X coordinate>
 		// solution determines which solution of the curve we use.
@@ -115,20 +125,12 @@ func ParsePubKey(pubKeyStr []byte, curve *KoblitzCurve) (key *PublicKey, err err
 		if err != nil {
 			return nil, err
 		}
+
 	default: // wrong!
 		return nil, fmt.Errorf("invalid pub key length %d",
 			len(pubKeyStr))
 	}
 
-	if pubkey.X.Cmp(pubkey.Curve.Params().P) >= 0 {
-		return nil, fmt.Errorf("pubkey X parameter is >= to P")
-	}
-	if pubkey.Y.Cmp(pubkey.Curve.Params().P) >= 0 {
-		return nil, fmt.Errorf("pubkey Y parameter is >= to P")
-	}
-	if !pubkey.Curve.IsOnCurve(pubkey.X, pubkey.Y) {
-		return nil, fmt.Errorf("pubkey isn't on secp256k1 curve")
-	}
 	return &pubkey, nil
 }
 

vendor/github.com/btcsuite/btcd/btcec/signature.go

@@ -276,7 +276,7 @@ func hashToInt(hash []byte, c elliptic.Curve) *big.Int {
 }
 
 // recoverKeyFromSignature recovers a public key from the signature "sig" on the
-// given message hash "msg". Based on the algorithm found in section 5.1.5 of
+// given message hash "msg". Based on the algorithm found in section 4.1.6 of
 // SEC 1 Ver 2.0, page 47-48 (53 and 54 in the pdf). This performs the details
 // in the inner loop in Step 1. The counter provided is actually the j parameter
 // of the loop * 2 - on the first iteration of j we do the R case, else the -R

vendor/github.com/btcsuite/btcd/btcjson/chainsvrcmds.go

@@ -638,6 +638,7 @@ func NewSearchRawTransactionsCmd(address string, verbose, skip, count *int, vinE
 type SendRawTransactionCmd struct {
 	HexTx         string
 	AllowHighFees *bool `jsonrpcdefault:"false"`
+	MaxFeeRate    *int32
 }
 
 // NewSendRawTransactionCmd returns a new instance which can be used to issue a
@@ -652,6 +653,17 @@ func NewSendRawTransactionCmd(hexTx string, allowHighFees *bool) *SendRawTransac
 	}
 }
 
+// NewSendRawTransactionCmd returns a new instance which can be used to issue a
+// sendrawtransaction JSON-RPC command to a bitcoind node.
+//
+// A 0 maxFeeRate indicates that a maximum fee rate won't be enforced.
+func NewBitcoindSendRawTransactionCmd(hexTx string, maxFeeRate int32) *SendRawTransactionCmd {
+	return &SendRawTransactionCmd{
+		HexTx:      hexTx,
+		MaxFeeRate: &maxFeeRate,
+	}
+}
+
 // SetGenerateCmd defines the setgenerate JSON-RPC command.
 type SetGenerateCmd struct {
 	Generate     bool

vendor/github.com/btcsuite/btcd/btcjson/chainsvrresults.go

@@ -90,28 +90,61 @@ type SoftForkDescription struct {
 // Bip9SoftForkDescription describes the current state of a defined BIP0009
 // version bits soft-fork.
 type Bip9SoftForkDescription struct {
-	Status    string `json:"status"`
-	Bit       uint8  `json:"bit"`
-	StartTime int64  `json:"startTime"`
-	Timeout   int64  `json:"timeout"`
-	Since     int32  `json:"since"`
+	Status     string `json:"status"`
+	Bit        uint8  `json:"bit"`
+	StartTime1 int64  `json:"startTime"`
+	StartTime2 int64  `json:"start_time"`
+	Timeout    int64  `json:"timeout"`
+	Since      int32  `json:"since"`
+}
+
+// StartTime returns the starting time of the softfork as a Unix epoch.
+func (d *Bip9SoftForkDescription) StartTime() int64 {
+	if d.StartTime1 != 0 {
+		return d.StartTime1
+	}
+	return d.StartTime2
+}
+
+// SoftForks describes the current softforks enabled by the backend. Softforks
+// activated through BIP9 are grouped together separate from any other softforks
+// with different activation types.
+type SoftForks struct {
+	SoftForks     []*SoftForkDescription              `json:"softforks"`
+	Bip9SoftForks map[string]*Bip9SoftForkDescription `json:"bip9_softforks"`
+}
+
+// UnifiedSoftForks describes a softforks in a general manner, irrespective of
+// its activation type. This was a format introduced by bitcoind v0.19.0
+type UnifiedSoftFork struct {
+	Type                    string                   `json:"type"`
+	BIP9SoftForkDescription *Bip9SoftForkDescription `json:"bip9"`
+	Height                  int32                    `json:"height"`
+	Active                  bool                     `json:"active"`
+}
+
+// UnifiedSoftForks describes the current softforks enabled the by the backend
+// in a unified manner, i.e, softforks with different activation types are
+// grouped together. This was a format introduced by bitcoind v0.19.0
+type UnifiedSoftForks struct {
+	SoftForks map[string]*UnifiedSoftFork `json:"softforks"`
 }
 
 // GetBlockChainInfoResult models the data returned from the getblockchaininfo
 // command.
 type GetBlockChainInfoResult struct {
-	Chain                string                              `json:"chain"`
-	Blocks               int32                               `json:"blocks"`
-	Headers              int32                               `json:"headers"`
-	BestBlockHash        string                              `json:"bestblockhash"`
-	Difficulty           float64                             `json:"difficulty"`
-	MedianTime           int64                               `json:"mediantime"`
-	VerificationProgress float64                             `json:"verificationprogress,omitempty"`
-	Pruned               bool                                `json:"pruned"`
-	PruneHeight          int32                               `json:"pruneheight,omitempty"`
-	ChainWork            string                              `json:"chainwork,omitempty"`
-	SoftForks            []*SoftForkDescription              `json:"softforks"`
-	Bip9SoftForks        map[string]*Bip9SoftForkDescription `json:"bip9_softforks"`
+	Chain                string  `json:"chain"`
+	Blocks               int32   `json:"blocks"`
+	Headers              int32   `json:"headers"`
+	BestBlockHash        string  `json:"bestblockhash"`
+	Difficulty           float64 `json:"difficulty"`
+	MedianTime           int64   `json:"mediantime"`
+	VerificationProgress float64 `json:"verificationprogress,omitempty"`
+	Pruned               bool    `json:"pruned"`
+	PruneHeight          int32   `json:"pruneheight,omitempty"`
+	ChainWork            string  `json:"chainwork,omitempty"`
+	*SoftForks
+	*UnifiedSoftForks
 }
 
 // GetBlockTemplateResultTx models the transactions field of the
@@ -265,6 +298,7 @@ type GetPeerInfoResult struct {
 type GetRawMempoolVerboseResult struct {
 	Size             int32    `json:"size"`
 	Vsize            int32    `json:"vsize"`
+	Weight           int32    `json:"weight"`
 	Fee              float64  `json:"fee"`
 	Time             int64    `json:"time"`
 	Height           int64    `json:"height"`
@@ -505,6 +539,7 @@ type TxRawResult struct {
 	Hash          string `json:"hash,omitempty"`
 	Size          int32  `json:"size,omitempty"`
 	Vsize         int32  `json:"vsize,omitempty"`
+	Weight        int32  `json:"weight,omitempty"`
 	Version       int32  `json:"version"`
 	LockTime      uint32 `json:"locktime"`
 	Vin           []Vin  `json:"vin"`
@@ -523,6 +558,7 @@ type SearchRawTransactionsResult struct {
 	Hash          string       `json:"hash"`
 	Size          string       `json:"size"`
 	Vsize         string       `json:"vsize"`
+	Weight        string       `json:"weight"`
 	Version       int32        `json:"version"`
 	LockTime      uint32       `json:"locktime"`
 	Vin           []VinPrevOut `json:"vin"`

vendor/github.com/btcsuite/btcd/rpcclient/chain.go

@@ -253,16 +253,15 @@ func (c *Client) GetDifficulty() (float64, error) {
 
 // FutureGetBlockChainInfoResult is a promise to deliver the result of a
 // GetBlockChainInfoAsync RPC invocation (or an applicable error).
-type FutureGetBlockChainInfoResult chan *response
-
-// Receive waits for the response promised by the future and returns chain info
-// result provided by the server.
-func (r FutureGetBlockChainInfoResult) Receive() (*btcjson.GetBlockChainInfoResult, error) {
-	res, err := receiveFuture(r)
-	if err != nil {
-		return nil, err
-	}
+type FutureGetBlockChainInfoResult struct {
+	client   *Client
+	Response chan *response
+}
 
+// unmarshalPartialGetBlockChainInfoResult unmarshals the response into an
+// instance of GetBlockChainInfoResult without populating the SoftForks and
+// UnifiedSoftForks fields.
+func unmarshalPartialGetBlockChainInfoResult(res []byte) (*btcjson.GetBlockChainInfoResult, error) {
 	var chainInfo btcjson.GetBlockChainInfoResult
 	if err := json.Unmarshal(res, &chainInfo); err != nil {
 		return nil, err
@@ -270,6 +269,59 @@ func (r FutureGetBlockChainInfoResult) Receive() (*btcjson.GetBlockChainInfoResu
 	return &chainInfo, nil
 }
 
+// unmarshalGetBlockChainInfoResultSoftForks properly unmarshals the softforks
+// related fields into the GetBlockChainInfoResult instance.
+func unmarshalGetBlockChainInfoResultSoftForks(chainInfo *btcjson.GetBlockChainInfoResult,
+	version BackendVersion, res []byte) error {
+
+	switch version {
+	// Versions of bitcoind on or after v0.19.0 use the unified format.
+	case BitcoindPost19:
+		var softForks btcjson.UnifiedSoftForks
+		if err := json.Unmarshal(res, &softForks); err != nil {
+			return err
+		}
+		chainInfo.UnifiedSoftForks = &softForks
+
+	// All other versions use the original format.
+	default:
+		var softForks btcjson.SoftForks
+		if err := json.Unmarshal(res, &softForks); err != nil {
+			return err
+		}
+		chainInfo.SoftForks = &softForks
+	}
+
+	return nil
+}
+
+// Receive waits for the response promised by the future and returns chain info
+// result provided by the server.
+func (r FutureGetBlockChainInfoResult) Receive() (*btcjson.GetBlockChainInfoResult, error) {
+	res, err := receiveFuture(r.Response)
+	if err != nil {
+		return nil, err
+	}
+	chainInfo, err := unmarshalPartialGetBlockChainInfoResult(res)
+	if err != nil {
+		return nil, err
+	}
+
+	// Inspect the version to determine how we'll need to parse the
+	// softforks from the response.
+	version, err := r.client.BackendVersion()
+	if err != nil {
+		return nil, err
+	}
+
+	err = unmarshalGetBlockChainInfoResultSoftForks(chainInfo, version, res)
+	if err != nil {
+		return nil, err
+	}
+
+	return chainInfo, nil
+}
+
 // GetBlockChainInfoAsync returns an instance of a type that can be used to get
 // the result of the RPC at some future time by invoking the Receive function
 // on the returned instance.
@@ -277,7 +329,10 @@ func (r FutureGetBlockChainInfoResult) Receive() (*btcjson.GetBlockChainInfoResu
 // See GetBlockChainInfo for the blocking version and more details.
 func (c *Client) GetBlockChainInfoAsync() FutureGetBlockChainInfoResult {
 	cmd := btcjson.NewGetBlockChainInfoCmd()
-	return c.sendCmd(cmd)
+	return FutureGetBlockChainInfoResult{
+		client:   c,
+		Response: c.sendCmd(cmd),
+	}
 }
 
 // GetBlockChainInfo returns information related to the processing state of

vendor/github.com/btcsuite/btcd/rpcclient/infrastructure.go

@@ -19,6 +19,7 @@ import (
 	"net"
 	"net/http"
 	"net/url"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -103,6 +104,22 @@ type jsonRequest struct {
 	responseChan   chan *response
 }
 
+// BackendVersion represents the version of the backend the client is currently
+// connected to.
+type BackendVersion uint8
+
+const (
+	// BitcoindPre19 represents a bitcoind version before 0.19.0.
+	BitcoindPre19 BackendVersion = iota
+
+	// BitcoindPost19 represents a bitcoind version equal to or greater than
+	// 0.19.0.
+	BitcoindPost19
+
+	// Btcd represents a catch-all btcd version.
+	Btcd
+)
+
 // Client represents a Bitcoin RPC client which allows easy access to the
 // various RPC methods available on a Bitcoin RPC server.  Each of the wrapper
 // functions handle the details of converting the passed and return types to and
@@ -129,6 +146,11 @@ type Client struct {
 	// POST mode.
 	httpClient *http.Client
 
+	// backendVersion is the version of the backend the client is currently
+	// connected to. This should be retrieved through GetVersion.
+	backendVersionMu sync.Mutex
+	backendVersion   *BackendVersion
+
 	// mtx is a mutex to protect access to connection related fields.
 	mtx sync.Mutex
 
@@ -659,6 +681,12 @@ out:
 			log.Infof("Reestablished connection to RPC server %s",
 				c.config.Host)
 
+			// Reset the version in case the backend was
+			// disconnected due to an upgrade.
+			c.backendVersionMu.Lock()
+			c.backendVersion = nil
+			c.backendVersionMu.Unlock()
+
 			// Reset the connection state and signal the reconnect
 			// has happened.
 			c.wsConn = wsConn
@@ -1332,3 +1360,84 @@ func (c *Client) Connect(tries int) error {
 	// All connection attempts failed, so return the last error.
 	return err
 }
+
+const (
+	// bitcoind19Str is the string representation of bitcoind v0.19.0.
+	bitcoind19Str = "0.19.0"
+
+	// bitcoindVersionPrefix specifies the prefix included in every bitcoind
+	// version exposed through GetNetworkInfo.
+	bitcoindVersionPrefix = "/Satoshi:"
+
+	// bitcoindVersionSuffix specifies the suffix included in every bitcoind
+	// version exposed through GetNetworkInfo.
+	bitcoindVersionSuffix = "/"
+)
+
+// parseBitcoindVersion parses the bitcoind version from its string
+// representation.
+func parseBitcoindVersion(version string) BackendVersion {
+	// Trim the version of its prefix and suffix to determine the
+	// appropriate version number.
+	version = strings.TrimPrefix(
+		strings.TrimSuffix(version, bitcoindVersionSuffix),
+		bitcoindVersionPrefix,
+	)
+	switch {
+	case version < bitcoind19Str:
+		return BitcoindPre19
+	default:
+		return BitcoindPost19
+	}
+}
+
+// BackendVersion retrieves the version of the backend the client is currently
+// connected to.
+func (c *Client) BackendVersion() (BackendVersion, error) {
+	c.backendVersionMu.Lock()
+	defer c.backendVersionMu.Unlock()
+
+	if c.backendVersion != nil {
+		return *c.backendVersion, nil
+	}
+
+	// We'll start by calling GetInfo. This method doesn't exist for
+	// bitcoind nodes as of v0.16.0, so we'll assume the client is connected
+	// to a btcd backend if it does exist.
+	info, err := c.GetInfo()
+
+	switch err := err.(type) {
+	// Parse the btcd version and cache it.
+	case nil:
+		log.Debugf("Detected btcd version: %v", info.Version)
+		version := Btcd
+		c.backendVersion = &version
+		return *c.backendVersion, nil
+
+	// Inspect the RPC error to ensure the method was not found, otherwise
+	// we actually ran into an error.
+	case *btcjson.RPCError:
+		if err.Code != btcjson.ErrRPCMethodNotFound.Code {
+			return 0, fmt.Errorf("unable to detect btcd version: "+
+				"%v", err)
+		}
+
+	default:
+		return 0, fmt.Errorf("unable to detect btcd version: %v", err)
+	}
+
+	// Since the GetInfo method was not found, we assume the client is
+	// connected to a bitcoind backend, which exposes its version through
+	// GetNetworkInfo.
+	networkInfo, err := c.GetNetworkInfo()
+	if err != nil {
+		return 0, fmt.Errorf("unable to detect bitcoind version: %v", err)
+	}
+
+	// Parse the bitcoind version and cache it.
+	log.Debugf("Detected bitcoind version: %v", networkInfo.SubVersion)
+	version := parseBitcoindVersion(networkInfo.SubVersion)
+	c.backendVersion = &version
+
+	return *c.backendVersion, nil
+}

vendor/github.com/btcsuite/btcd/rpcclient/net.go

@@ -244,6 +244,43 @@ func (c *Client) Ping() error {
 	return c.PingAsync().Receive()
 }
 
+// FutureGetNetworkInfoResult is a future promise to deliver the result of a
+// GetNetworkInfoAsync RPC invocation (or an applicable error).
+type FutureGetNetworkInfoResult chan *response
+
+// Receive waits for the response promised by the future and returns data about
+// the current network.
+func (r FutureGetNetworkInfoResult) Receive() (*btcjson.GetNetworkInfoResult, error) {
+	res, err := receiveFuture(r)
+	if err != nil {
+		return nil, err
+	}
+
+	// Unmarshal result as an array of getpeerinfo result objects.
+	var networkInfo btcjson.GetNetworkInfoResult
+	err = json.Unmarshal(res, &networkInfo)
+	if err != nil {
+		return nil, err
+	}
+
+	return &networkInfo, nil
+}
+
+// GetNetworkInfoAsync returns an instance of a type that can be used to get the
+// result of the RPC at some future time by invoking the Receive function on the
+// returned instance.
+//
+// See GetNetworkInfo for the blocking version and more details.
+func (c *Client) GetNetworkInfoAsync() FutureGetNetworkInfoResult {
+	cmd := btcjson.NewGetNetworkInfoCmd()
+	return c.sendCmd(cmd)
+}
+
+// GetNetworkInfo returns data about the current network.
+func (c *Client) GetNetworkInfo() (*btcjson.GetNetworkInfoResult, error) {
+	return c.GetNetworkInfoAsync().Receive()
+}
+
 // FutureGetPeerInfoResult is a future promise to deliver the result of a
 // GetPeerInfoAsync RPC invocation (or an applicable error).
 type FutureGetPeerInfoResult chan *response

vendor/github.com/btcsuite/btcd/rpcclient/rawtransactions.go

@@ -15,6 +15,12 @@ import (
 	"github.com/btcsuite/btcutil"
 )
 
+const (
+	// defaultMaxFeeRate is the default maximum fee rate in sat/KB enforced
+	// by bitcoind v0.19.0 or after for transaction broadcast.
+	defaultMaxFeeRate = btcutil.SatoshiPerBitcoin / 10
+)
+
 // SigHashType enumerates the available signature hashing types that the
 // SignRawTransaction function accepts.
 type SigHashType string
@@ -296,7 +302,31 @@ func (c *Client) SendRawTransactionAsync(tx *wire.MsgTx, allowHighFees bool) Fut
 		txHex = hex.EncodeToString(buf.Bytes())
 	}
 
-	cmd := btcjson.NewSendRawTransactionCmd(txHex, &allowHighFees)
+	// Due to differences in the sendrawtransaction API for different
+	// backends, we'll need to inspect our version and construct the
+	// appropriate request.
+	version, err := c.BackendVersion()
+	if err != nil {
+		return newFutureError(err)
+	}
+
+	var cmd *btcjson.SendRawTransactionCmd
+	switch version {
+	// Starting from bitcoind v0.19.0, the MaxFeeRate field should be used.
+	case BitcoindPost19:
+		// Using a 0 MaxFeeRate is interpreted as a maximum fee rate not
+		// being enforced by bitcoind.
+		var maxFeeRate int32
+		if !allowHighFees {
+			maxFeeRate = defaultMaxFeeRate
+		}
+		cmd = btcjson.NewBitcoindSendRawTransactionCmd(txHex, maxFeeRate)
+
+	// Otherwise, use the AllowHighFees field.
+	default:
+		cmd = btcjson.NewSendRawTransactionCmd(txHex, &allowHighFees)
+	}
+
 	return c.sendCmd(cmd)
 }
 

vendor/github.com/btcsuite/btcutil/base58/genalphabet.go

@@ -1,79 +0,0 @@
-// Copyright (c) 2015 The btcsuite developers
-// Use of this source code is governed by an ISC
-// license that can be found in the LICENSE file.
-
-//+build ignore
-
-package main
-
-import (
-	"bytes"
-	"io"
-	"log"
-	"os"
-	"strconv"
-)
-
-var (
-	start = []byte(`// Copyright (c) 2015 The btcsuite developers
-// Use of this source code is governed by an ISC
-// license that can be found in the LICENSE file.
-
-// AUTOGENERATED by genalphabet.go; do not edit.
-
-package base58
-
-const (
-	// alphabet is the modified base58 alphabet used by Bitcoin.
-	alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
-
-	alphabetIdx0 = '1'
-)
-
-var b58 = [256]byte{`)
-
-	end = []byte(`}`)
-
-	alphabet = []byte("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz")
-	tab      = []byte("\t")
-	invalid  = []byte("255")
-	comma    = []byte(",")
-	space    = []byte(" ")
-	nl       = []byte("\n")
-)
-
-func write(w io.Writer, b []byte) {
-	_, err := w.Write(b)
-	if err != nil {
-		log.Fatal(err)
-	}
-}
-
-func main() {
-	fi, err := os.Create("alphabet.go")
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer fi.Close()
-
-	write(fi, start)
-	write(fi, nl)
-	for i := byte(0); i < 32; i++ {
-		write(fi, tab)
-		for j := byte(0); j < 8; j++ {
-			idx := bytes.IndexByte(alphabet, i*8+j)
-			if idx == -1 {
-				write(fi, invalid)
-			} else {
-				write(fi, strconv.AppendInt(nil, int64(idx), 10))
-			}
-			write(fi, comma)
-			if j != 7 {
-				write(fi, space)
-			}
-		}
-		write(fi, nl)
-	}
-	write(fi, end)
-	write(fi, nl)
-}

vendor/github.com/btcsuite/btcwallet/walletdb/bdb/README.md

@@ -10,18 +10,19 @@ datastore.  Package bdb is licensed under the copyfree ISC license.
 ## Usage
 
 This package is only a driver to the walletdb package and provides the database
-type of "bdb".  The only parameter the Open and Create functions take is the
-database path as a string:
+type of "bdb". The only parameters the Open and Create functions take is the
+database path as a string, and an option for the database to not sync its
+freelist to disk as a bool:
 
 ```Go
-db, err := walletdb.Open("bdb", "path/to/database.db")
+db, err := walletdb.Open("bdb", "path/to/database.db", true)
 if err != nil {
 	// Handle error
 }
 ```
 
 ```Go
-db, err := walletdb.Create("bdb", "path/to/database.db")
+db, err := walletdb.Create("bdb", "path/to/database.db", true)
 if err != nil {
 	// Handle error
 }

vendor/github.com/btcsuite/btcwallet/walletdb/bdb/db.go

@@ -339,7 +339,7 @@ func fileExists(name string) bool {
 
 // openDB opens the database at the provided path.  walletdb.ErrDbDoesNotExist
 // is returned if the database doesn't exist and the create flag is not set.
-func openDB(dbPath string, create bool) (walletdb.DB, error) {
+func openDB(dbPath string, noFreelistSync bool, create bool) (walletdb.DB, error) {
 	if !create && !fileExists(dbPath) {
 		return nil, walletdb.ErrDbDoesNotExist
 	}
@@ -347,7 +347,7 @@ func openDB(dbPath string, create bool) (walletdb.DB, error) {
 	// Specify bbolt freelist options to reduce heap pressure in case the
 	// freelist grows to be very large.
 	options := &bbolt.Options{
-		NoFreelistSync: true,
+		NoFreelistSync: noFreelistSync,
 		FreelistType:   bbolt.FreelistMapType,
 	}
 

vendor/github.com/btcsuite/btcwallet/walletdb/bdb/doc.go

@@ -9,15 +9,16 @@ datastore.
 Usage
 
 This package is only a driver to the walletdb package and provides the database
-type of "bdb".  The only parameter the Open and Create functions take is the
-database path as a string:
+type of "bdb". The only parameters the Open and Create functions take is the
+database path as a string, and an option for the database to not sync its
+freelist to disk as a bool:
 
-	db, err := walletdb.Open("bdb", "path/to/database.db")
+	db, err := walletdb.Open("bdb", "path/to/database.db", true)
 	if err != nil {
 		// Handle error
 	}
 
-	db, err := walletdb.Create("bdb", "path/to/database.db")
+	db, err := walletdb.Create("bdb", "path/to/database.db", true)
 	if err != nil {
 		// Handle error
 	}

vendor/github.com/btcsuite/btcwallet/walletdb/bdb/driver.go

@@ -15,41 +15,50 @@ const (
 )
 
 // parseArgs parses the arguments from the walletdb Open/Create methods.
-func parseArgs(funcName string, args ...interface{}) (string, error) {
-	if len(args) != 1 {
-		return "", fmt.Errorf("invalid arguments to %s.%s -- "+
-			"expected database path", dbType, funcName)
+func parseArgs(funcName string, args ...interface{}) (string, bool, error) {
+	if len(args) != 2 {
+		return "", false, fmt.Errorf("invalid arguments to %s.%s -- "+
+			"expected database path and no-freelist-sync option",
+			dbType, funcName)
 	}
 
 	dbPath, ok := args[0].(string)
 	if !ok {
-		return "", fmt.Errorf("first argument to %s.%s is invalid -- "+
-			"expected database path string", dbType, funcName)
+		return "", false, fmt.Errorf("first argument to %s.%s is "+
+			"invalid -- expected database path string", dbType,
+			funcName)
 	}
 
-	return dbPath, nil
+	noFreelistSync, ok := args[1].(bool)
+	if !ok {
+		return "", false, fmt.Errorf("second argument to %s.%s is "+
+			"invalid -- expected no-freelist-sync bool", dbType,
+			funcName)
+	}
+
+	return dbPath, noFreelistSync, nil
 }
 
 // openDBDriver is the callback provided during driver registration that opens
 // an existing database for use.
 func openDBDriver(args ...interface{}) (walletdb.DB, error) {
-	dbPath, err := parseArgs("Open", args...)
+	dbPath, noFreelistSync, err := parseArgs("Open", args...)
 	if err != nil {
 		return nil, err
 	}
 
-	return openDB(dbPath, false)
+	return openDB(dbPath, noFreelistSync, false)
 }
 
 // createDBDriver is the callback provided during driver registration that
 // creates, initializes, and opens a database for use.
 func createDBDriver(args ...interface{}) (walletdb.DB, error) {
-	dbPath, err := parseArgs("Create", args...)
+	dbPath, noFreelistSync, err := parseArgs("Create", args...)
 	if err != nil {
 		return nil, err
 	}
 
-	return openDB(dbPath, true)
+	return openDB(dbPath, noFreelistSync, true)
 }
 
 func init() {