multi: Redefine GetCFHeaders to have StartHeight and StopHash.

peer/peer_test.go

@@ -540,7 +540,7 @@ func TestPeerListeners(t *testing.T) {
 		},
 		{
 			"OnGetCFHeaders",
-			wire.NewMsgGetCFHeaders(),
+			wire.NewMsgGetCFHeaders(wire.GCSFilterRegular, 0, &chainhash.Hash{}),
 		},
 		{
 			"OnCFilter",

server.go

@@ -788,91 +788,36 @@ func (sp *serverPeer) OnGetCFHeaders(_ *peer.Peer, msg *wire.MsgGetCFHeaders) {
 		return
 	}
 
-	// Attempt to look up the height of the provided stop hash.
-	chain := sp.server.chain
-	endIdx := int32(math.MaxInt32)
-	height, err := chain.BlockHeightByHash(&msg.HashStop)
-	if err == nil {
-		endIdx = height + 1
-	}
-
-	// There are no block locators so a specific header is being requested
-	// as identified by the stop hash.
-	if len(msg.BlockLocatorHashes) == 0 {
-		// No blocks with the stop hash were found so there is nothing
-		// to do.  Just return.  This behavior mirrors the reference
-		// implementation.
-		if endIdx == math.MaxInt32 {
-			return
-		}
-
-		// Fetch the raw committed filter header bytes from the
-		// database.
-		headerBytes, err := sp.server.cfIndex.FilterHeaderByBlockHash(
-			&msg.HashStop, msg.FilterType)
-		if (err != nil) || (len(headerBytes) == 0) {
-			peerLog.Warnf("Could not obtain CF header for %v: %v",
-				msg.HashStop, err)
-			return
-		}
-
-		// Deserialize the hash.
-		var header chainhash.Hash
-		err = header.SetBytes(headerBytes)
-		if err != nil {
-			peerLog.Warnf("Committed filter header deserialize "+
-				"failed: %v", err)
-			return
-		}
-
-		headersMsg := wire.NewMsgCFHeaders()
-		headersMsg.AddCFHeader(&header)
-		headersMsg.StopHash = msg.HashStop
-		headersMsg.FilterType = msg.FilterType
-		sp.QueueMessage(headersMsg, nil)
-		return
-	}
-
-	// Find the most recent known block based on the block locator.
-	// Use the block after the genesis block if no other blocks in the
-	// provided locator are known.  This does mean the client will start
-	// over with the genesis block if unknown block locators are provided.
-	// This mirrors the behavior in the reference implementation.
-	startIdx := int32(1)
-	for _, hash := range msg.BlockLocatorHashes {
-		height, err := chain.BlockHeightByHash(hash)
-		if err == nil {
-			// Start with the next hash since we know this one.
-			startIdx = height + 1
-			break
-		}
-	}
-
-	// Don't attempt to fetch more than we can put into a single message.
-	if endIdx-startIdx > wire.MaxBlockHeadersPerMsg {
-		endIdx = startIdx + wire.MaxBlockHeadersPerMsg
-	}
-
-	// Fetch the inventory from the block database.
-	hashList, err := chain.HeightRange(startIdx, endIdx)
+	// Fetch the hashes from the block index.
+	hashList, err := sp.server.chain.HeightToHashRange(int32(msg.StartHeight),
+		&msg.StopHash, wire.MaxCFHeadersPerMsg)
 	if err != nil {
-		peerLog.Warnf("Header lookup failed: %v", err)
-		return
+		peerLog.Debugf("Invalid getcfheaders request: %v", err)
 	}
 	if len(hashList) == 0 {
 		return
 	}
 
+	// Create []*chainhash.Hash from []chainhash.Hash to pass to
+	// FilterHeadersByBlockHashes.
+	hashPtrs := make([]*chainhash.Hash, len(hashList))
+	for i := range hashList {
+		hashPtrs[i] = &hashList[i]
+	}
+
+	// Fetch the raw filter header bytes from the database for all blocks.
+	filterHeaders, err := sp.server.cfIndex.FilterHeadersByBlockHashes(hashPtrs,
+		msg.FilterType)
+	if err != nil {
+		peerLog.Errorf("Error retrieving cfilters: %v", err)
+		return
+	}
+
 	// Generate cfheaders message and send it.
 	headersMsg := wire.NewMsgCFHeaders()
-	for i := range hashList {
-		// Fetch the raw committed filter header bytes from the
-		// database.
-		headerBytes, err := sp.server.cfIndex.FilterHeaderByBlockHash(
-			&hashList[i], msg.FilterType)
-		if (err != nil) || (len(headerBytes) == 0) {
-			peerLog.Warnf("Could not obtain CF header for %v: %v",
-				hashList[i], err)
+	for i, headerBytes := range filterHeaders {
+		if len(headerBytes) == 0 {
+			peerLog.Warnf("Could not obtain CF header for %v", hashList[i])
 			return
 		}
 

wire/message_test.go

@@ -70,7 +70,7 @@ func TestMessage(t *testing.T) {
 	msgMerkleBlock := NewMsgMerkleBlock(bh)
 	msgReject := NewMsgReject("block", RejectDuplicate, "duplicate block")
 	msgGetCFilters := NewMsgGetCFilters(GCSFilterExtended, 0, &chainhash.Hash{})
-	msgGetCFHeaders := NewMsgGetCFHeaders()
+	msgGetCFHeaders := NewMsgGetCFHeaders(GCSFilterExtended, 0, &chainhash.Hash{})
 	msgCFilter := NewMsgCFilter(GCSFilterExtended, &chainhash.Hash{},
 		[]byte("payload"))
 	msgCFHeaders := NewMsgCFHeaders()
@@ -104,7 +104,7 @@ func TestMessage(t *testing.T) {
 		{msgMerkleBlock, msgMerkleBlock, pver, MainNet, 110},
 		{msgReject, msgReject, pver, MainNet, 79},
 		{msgGetCFilters, msgGetCFilters, pver, MainNet, 61},
-		{msgGetCFHeaders, msgGetCFHeaders, pver, MainNet, 58},
+		{msgGetCFHeaders, msgGetCFHeaders, pver, MainNet, 61},
 		{msgCFilter, msgCFilter, pver, MainNet, 65},
 		{msgCFHeaders, msgCFHeaders, pver, MainNet, 58},
 	}

wire/msggetcfheaders.go

@@ -5,7 +5,6 @@
 package wire
 
 import (
-	"fmt"
 	"io"
 
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
@@ -15,87 +14,51 @@ import (
 // filter headers. It allows to set the FilterType field to get headers in the
 // chain of basic (0x00) or extended (0x01) headers.
 type MsgGetCFHeaders struct {
-	BlockLocatorHashes []*chainhash.Hash
-	HashStop           chainhash.Hash
-	FilterType         FilterType
-}
-
-// AddBlockLocatorHash adds a new block locator hash to the message.
-func (msg *MsgGetCFHeaders) AddBlockLocatorHash(hash *chainhash.Hash) error {
-	if len(msg.BlockLocatorHashes)+1 > MaxBlockLocatorsPerMsg {
-		str := fmt.Sprintf("too many block locator hashes for message [max %v]",
-			MaxBlockLocatorsPerMsg)
-		return messageError("MsgGetCFHeaders.AddBlockLocatorHash", str)
-	}
-
-	msg.BlockLocatorHashes = append(msg.BlockLocatorHashes, hash)
-	return nil
+	FilterType  FilterType
+	StartHeight uint32
+	StopHash    chainhash.Hash
 }
 
 // BtcDecode decodes r using the bitcoin protocol encoding into the receiver.
 // This is part of the Message interface implementation.
 func (msg *MsgGetCFHeaders) BtcDecode(r io.Reader, pver uint32, _ MessageEncoding) error {
-	// Read num block locator hashes and limit to max.
-	count, err := ReadVarInt(r, pver)
-	if err != nil {
-		return err
-	}
-	if count > MaxBlockLocatorsPerMsg {
-		str := fmt.Sprintf("too many block locator hashes for message "+
-			"[count %v, max %v]", count, MaxBlockLocatorsPerMsg)
-		return messageError("MsgGetHeaders.BtcDecode", str)
-	}
-
-	// Create a contiguous slice of hashes to deserialize into in order to
-	// reduce the number of allocations.
-	locatorHashes := make([]chainhash.Hash, count)
-	msg.BlockLocatorHashes = make([]*chainhash.Hash, 0, count)
-	for i := uint64(0); i < count; i++ {
-		hash := &locatorHashes[i]
-		err := readElement(r, hash)
-		if err != nil {
-			return err
-		}
-		msg.AddBlockLocatorHash(hash)
-	}
-
-	err = readElement(r, &msg.HashStop)
+	err := readElement(r, &msg.FilterType)
 	if err != nil {
 		return err
 	}
 
-	return readElement(r, &msg.FilterType)
+	err = readElement(r, &msg.StartHeight)
+	if err != nil {
+		return err
+	}
+
+	err = readElement(r, &msg.StopHash)
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
 // BtcEncode encodes the receiver to w using the bitcoin protocol encoding.
 // This is part of the Message interface implementation.
 func (msg *MsgGetCFHeaders) BtcEncode(w io.Writer, pver uint32, _ MessageEncoding) error {
-	// Limit to max block locator hashes per message.
-	count := len(msg.BlockLocatorHashes)
-	if count > MaxBlockLocatorsPerMsg {
-		str := fmt.Sprintf("too many block locator hashes for message "+
-			"[count %v, max %v]", count, MaxBlockLocatorsPerMsg)
-		return messageError("MsgGetHeaders.BtcEncode", str)
-	}
-
-	err := WriteVarInt(w, pver, uint64(count))
+	err := writeElement(w, msg.FilterType)
 	if err != nil {
 		return err
 	}
 
-	for _, hash := range msg.BlockLocatorHashes {
-		err := writeElement(w, hash)
-		if err != nil {
-			return err
-		}
-	}
-
-	err = writeElement(w, &msg.HashStop)
+	err = writeElement(w, &msg.StartHeight)
 	if err != nil {
 		return err
 	}
 
-	return writeElement(w, msg.FilterType)
+	err = writeElement(w, &msg.StopHash)
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
 // Command returns the protocol command string for the message.  This is part
@@ -107,18 +70,18 @@ func (msg *MsgGetCFHeaders) Command() string {
 // MaxPayloadLength returns the maximum length the payload can be for the
 // receiver.  This is part of the Message interface implementation.
 func (msg *MsgGetCFHeaders) MaxPayloadLength(pver uint32) uint32 {
-	// Num block locator hashes (varInt) + max allowed
-	// block locators + hash stop + filter type 1 byte.
-	return MaxVarIntPayload + (MaxBlockLocatorsPerMsg *
-		chainhash.HashSize) + chainhash.HashSize + 1
+	// Filter type + uint32 + block hash
+	return 1 + 4 + chainhash.HashSize
 }
 
 // NewMsgGetCFHeaders returns a new bitcoin getcfheader message that conforms to
 // the Message interface using the passed parameters and defaults for the
 // remaining fields.
-func NewMsgGetCFHeaders() *MsgGetCFHeaders {
+func NewMsgGetCFHeaders(filterType FilterType, startHeight uint32,
+	stopHash *chainhash.Hash) *MsgGetCFHeaders {
 	return &MsgGetCFHeaders{
-		BlockLocatorHashes: make([]*chainhash.Hash, 0,
-			MaxBlockLocatorsPerMsg),
+		FilterType:  filterType,
+		StartHeight: startHeight,
+		StopHash:    *stopHash,
 	}
 }