added proof RPC

post-merge fixes

blockchain/claimtrie.go

@@ -3,16 +3,20 @@ package blockchain
 import (
 	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/pkg/errors"
 
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
 
+	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/btcsuite/btcd/claimtrie"
 	"github.com/btcsuite/btcd/claimtrie/change"
+	"github.com/btcsuite/btcd/claimtrie/merkletrie"
 	"github.com/btcsuite/btcd/claimtrie/node"
+	"github.com/btcsuite/btcd/claimtrie/param"
 )
 
 func (b *BlockChain) ParseClaimScripts(block *btcutil.Block, bn *blockNode, view *UtxoViewpoint,
@@ -166,3 +170,68 @@ func (b *BlockChain) GetClaimsForName(height int32, name string) (string, *node.
 	n.SortClaimsByBid()
 	return string(normalizedName), n, nil
 }
+
+func (b *BlockChain) GetProofForName(name, id string, bid, seq int) (chainhash.Hash, int32, *node.Claim, int32, int32, string, []merkletrie.HashSidePair, error) {
+	// results: block hash, height, claim, bid, takeover, name, pairs, err
+
+	b.chainLock.RLock()
+	defer b.chainLock.RUnlock()
+
+	tip := b.bestChain.Tip()
+
+	normalizedName := node.NormalizeIfNecessary([]byte(name), tip.height)
+
+	if tip.height < param.ActiveParams.GrandForkHeight {
+		err := errors.Errorf("Unable to generate proofs for claims before height %d",
+			param.ActiveParams.GrandForkHeight)
+		return tip.hash, tip.height, nil, 0, 0, string(normalizedName), nil, err
+	}
+
+	n, err := b.claimTrie.NodeAt(tip.height, normalizedName)
+	if n == nil && err == nil {
+		err = errors.Errorf("Unable to locate a claim with name %s at height %d", normalizedName, tip.height)
+	}
+	if err != nil {
+		return tip.hash, tip.height, nil, 0, 0, string(normalizedName), nil, err
+	}
+
+	// now find the desired claim
+	n.SortClaimsByBid()
+	var claim *node.Claim
+	for i, c := range n.Claims {
+		if c.Status != node.Activated {
+			continue
+		}
+		if bid >= 0 && i == bid {
+			claim = c
+			bid = i
+			break
+		}
+		if seq >= 0 && int(c.Sequence) == seq {
+			claim = c
+			bid = i
+			break
+		}
+		if len(id) > 0 && strings.HasPrefix(c.ClaimID.String(), id) {
+			claim = c
+			bid = i
+			break
+		}
+	}
+	if claim == nil {
+		if bid >= 0 {
+			err = errors.Errorf("Unable to locate a claim named %s with bid %d at height %d", normalizedName, bid, tip.height)
+		}
+		if seq >= 0 {
+			err = errors.Errorf("Unable to locate a claim named %s with sequence %d at height %d", normalizedName, seq, tip.height)
+		}
+		if len(id) > 0 {
+			err = errors.Errorf("Unable to locate a claim named %s with ID %s at height %d", normalizedName, id, tip.height)
+		}
+		return tip.hash, tip.height, nil, 0, 0, string(normalizedName), nil, err
+	}
+
+	pairs := b.claimTrie.MerklePath(normalizedName, n, bid)
+
+	return tip.hash, tip.height, claim, int32(bid), n.TakenOverAt, string(normalizedName), pairs, nil
+}

btcjson/claimcmds.go

@@ -10,6 +10,10 @@ func init() {
 	MustRegisterCmd("getclaimsfornamebybid", (*GetClaimsForNameByBidCmd)(nil), flags)
 	MustRegisterCmd("getclaimsfornamebyseq", (*GetClaimsForNameBySeqCmd)(nil), flags)
 	MustRegisterCmd("normalize", (*GetNormalizedCmd)(nil), flags)
+
+	MustRegisterCmd("getprooffornamebyid", (*GetProofForNameByIDCmd)(nil), flags)
+	MustRegisterCmd("getprooffornamebybid", (*GetProofForNameByBidCmd)(nil), flags)
+	MustRegisterCmd("getprooffornamebyseq", (*GetProofForNameBySeqCmd)(nil), flags)
 }
 
 // optional inputs are required to be pointers, but they support things like `jsonrpcdefault:"false"`
@@ -93,3 +97,36 @@ type GetNormalizedCmd struct {
 type GetNormalizedResult struct {
 	NormalizedName string `json:"normalizedname"`
 }
+
+type GetProofForNameByIDCmd struct {
+	Name           string `json:"name"`
+	PartialClaimID string `json:"partialclaimid"`
+}
+
+type GetProofForNameByBidCmd struct {
+	Name string `json:"name"`
+	Bid  int    `json:"bid"`
+}
+
+type GetProofForNameBySeqCmd struct {
+	Name     string `json:"name"`
+	Sequence int    `json:"sequence"`
+}
+
+type ProofPairResult struct {
+	Right bool   `json:"right"`
+	Hash  string `json:"hash"`
+}
+
+type ProofResult struct { // should we include the claim trie hash?
+	BlockHash      string            `json:"blockhash"`
+	BlockHeight    int32             `json:"blockheight"`
+	NormalizedName string            `json:"normalizedname"`
+	ClaimID        string            `json:"claimid"`
+	TXID           string            `json:"txid"`
+	N              uint32            `json:"n"`
+	Bid            int32             `json:"bid"`
+	Sequence       int32             `json:"sequence"`
+	Takeover       int32             `json:"takeover"`
+	Pairs          []ProofPairResult `json:"pairs"`
+}

claimtrie/claimtrie.go

@@ -299,7 +299,7 @@ func removeDuplicates(names [][]byte) [][]byte { // this might be too expensive;
 	return names
 }
 
-// ResetHeight resets the ClaimTrie to a previous known height..
+// ResetHeight resets the ClaimTrie to a previous known height.
 func (ct *ClaimTrie) ResetHeight(height int32) error {
 
 	names := make([][]byte, 0)
@@ -316,6 +316,9 @@ func (ct *ClaimTrie) ResetHeight(height int32) error {
 	}
 
 	passedHashFork := ct.height >= param.ActiveParams.AllClaimsInMerkleForkHeight && height < param.ActiveParams.AllClaimsInMerkleForkHeight
+	if !passedHashFork {
+		passedHashFork = ct.height >= param.ActiveParams.GrandForkHeight && height < param.ActiveParams.GrandForkHeight
+	}
 	ct.height = height
 	hash, err := ct.blockRepo.Get(height)
 	if err != nil {
@@ -463,3 +466,21 @@ func (ct *ClaimTrie) makeNameHashNext(names [][]byte, all bool) chan NameHashNex
 	}()
 	return outputs
 }
+
+func (ct *ClaimTrie) MerklePath(name []byte, n *node.Node, bid int) []merkletrie.HashSidePair {
+	pairs := ct.merkleTrie.MerklePath(name)
+	// TODO: organize this code better
+	// this is the 2nd half of the above merkle tree computation
+	// it's done like this so we don't have to create the Node object multiple times
+	claimHashes := node.ComputeClaimHashes(name, n)
+	partials := node.ComputeMerklePath(claimHashes, bid)
+	for i := len(partials) - 1; i >= 0; i-- {
+		pairs = append(pairs, merkletrie.HashSidePair{Right: ((bid >> i) & 1) > 0, Hash: partials[i]})
+	}
+
+	// reverse the list order:
+	for i, j := 0, len(pairs)-1; i < j; i, j = i+1, j-1 {
+		pairs[i], pairs[j] = pairs[j], pairs[i]
+	}
+	return pairs
+}

claimtrie/claimtrie_test.go

@@ -8,6 +8,7 @@ import (
 	"github.com/btcsuite/btcd/claimtrie/change"
 	"github.com/btcsuite/btcd/claimtrie/config"
 	"github.com/btcsuite/btcd/claimtrie/merkletrie"
+	"github.com/btcsuite/btcd/claimtrie/node"
 	"github.com/btcsuite/btcd/claimtrie/param"
 
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
@@ -982,3 +983,54 @@ func TestBlock884431(t *testing.T) {
 	r.NoError(err)
 	r.Equal(o11.String(), n.BestClaim.OutPoint.String())
 }
+
+func TestMerklePath(t *testing.T) {
+	r := require.New(t)
+	setup(t)
+	param.ActiveParams.ActiveDelayFactor = 1
+	param.ActiveParams.NormalizedNameForkHeight = 5
+	param.ActiveParams.AllClaimsInMerkleForkHeight = 6
+	param.ActiveParams.GrandForkHeight = 7
+
+	ct, err := New(cfg)
+	r.NoError(err)
+	r.NotNil(ct)
+	defer ct.Close()
+
+	hash := chainhash.HashH([]byte{1, 2, 3})
+	o1 := wire.OutPoint{Hash: hash, Index: 1}
+	o2 := wire.OutPoint{Hash: hash, Index: 2}
+	o3 := wire.OutPoint{Hash: hash, Index: 3}
+
+	err = ct.AddClaim([]byte("test"), o1, change.NewClaimID(o1), 1)
+	r.NoError(err)
+
+	err = ct.AddClaim([]byte("test"), o2, change.NewClaimID(o2), 2)
+	r.NoError(err)
+
+	err = ct.AddClaim([]byte("tester"), o3, change.NewClaimID(o3), 1)
+	r.NoError(err)
+
+	for i := 0; i < 10; i++ {
+		err = ct.AppendBlock()
+		r.NoError(err)
+	}
+
+	n, err := ct.NodeAt(ct.height, []byte("test"))
+	r.NoError(err)
+	pairs := ct.MerklePath([]byte("test"), n, 0)
+	claimHash, err := node.ComputeBidSeqNameHash([]byte("test"), n.Claims[0], 0, n.TakenOverAt)
+	r.NoError(err)
+	validatePairs(r, pairs, ct.MerkleHash(), claimHash)
+}
+
+func validatePairs(r *require.Assertions, pairs []merkletrie.HashSidePair, target *chainhash.Hash, claimHash *chainhash.Hash) {
+	for i := range pairs {
+		if pairs[i].Right {
+			claimHash = node.HashMerkleBranches(pairs[i].Hash, claimHash)
+		} else {
+			claimHash = node.HashMerkleBranches(claimHash, pairs[i].Hash)
+		}
+	}
+	r.True(claimHash.IsEqual(target))
+}

claimtrie/merkletrie/merkletrie.go

@@ -252,3 +252,7 @@ func (t *PersistentTrie) Dump(s string) {
 func (t *PersistentTrie) Flush() error {
 	return t.repo.Flush()
 }
+
+func (t *PersistentTrie) MerklePath(name []byte) []HashSidePair {
+	panic("MerklePath not implemented in PersistentTrie")
+}

claimtrie/merkletrie/ramtrie.go

@@ -16,6 +16,7 @@ type MerkleTrie interface {
 	MerkleHash() *chainhash.Hash
 	MerkleHashAllClaims() *chainhash.Hash
 	Flush() error
+	MerklePath(name []byte) []HashSidePair
 }
 
 type RamTrie struct {
@@ -117,29 +118,80 @@ func (rt *RamTrie) merkleHashAllClaims(v *collapsedVertex) *chainhash.Hash {
 		return v.merkleHash
 	}
 
-	childHashes := make([]*chainhash.Hash, 0, len(v.children))
-	for _, ch := range v.children {
-		h := rt.merkleHashAllClaims(ch)
-		childHashes = append(childHashes, h)
-	}
+	childHash, hasChildren := rt.computeChildHash(v)
 
 	claimHash := NoClaimsHash
 	if v.claimHash != nil {
 		claimHash = v.claimHash
-	} else if len(childHashes) == 0 {
+	} else if !hasChildren {
 		return nil
 	}
 
+	v.merkleHash = node.HashMerkleBranches(childHash, claimHash)
+	return v.merkleHash
+}
+
+func (rt *RamTrie) computeChildHash(v *collapsedVertex) (*chainhash.Hash, bool) {
+	childHashes := make([]*chainhash.Hash, 0, len(v.children))
+	for _, ch := range v.children {
+		h := rt.merkleHashAllClaims(ch)
+		childHashes = append(childHashes, h)
+	}
 	childHash := NoChildrenHash
 	if len(childHashes) > 0 {
 		// this shouldn't be referencing node; where else can we put this merkle root func?
 		childHash = node.ComputeMerkleRoot(childHashes)
 	}
-
-	v.merkleHash = node.HashMerkleBranches(childHash, claimHash)
-	return v.merkleHash
+	return childHash, len(childHashes) > 0
 }
 
 func (rt *RamTrie) Flush() error {
 	return nil
 }
+
+type HashSidePair struct {
+	Right bool
+	Hash  *chainhash.Hash
+}
+
+func (rt *RamTrie) MerklePath(name []byte) []HashSidePair {
+
+	// algorithm:
+	// for each node in the path to key:
+	//   get all the childHashes for that node and the index of our path
+	//   get all the claimHashes for that node as well
+	//   if we're at the end of the path:
+	//      push(true, root(childHashes))
+	//      push all of merklePath(claimHashes, bid)
+	//   else
+	//      push(false, root(claimHashes)
+	//      push all of merklePath(childHashes, child index)
+
+	var results []HashSidePair
+
+	indexes, path := rt.FindPath(name)
+	for i := 0; i < len(indexes); i++ {
+		if i == len(indexes)-1 {
+			childHash, _ := rt.computeChildHash(path[i])
+			results = append(results, HashSidePair{Right: true, Hash: childHash})
+			// letting the caller append the claim hashes at present (needs better code organization)
+		} else {
+			ch := path[i].claimHash
+			if ch == nil {
+				ch = NoClaimsHash
+			}
+			results = append(results, HashSidePair{Right: false, Hash: ch})
+			childHashes := make([]*chainhash.Hash, 0, len(path[i].children))
+			for j := range path[i].children {
+				childHashes = append(childHashes, path[i].children[j].merkleHash)
+			}
+			if len(childHashes) > 0 {
+				partials := node.ComputeMerklePath(childHashes, indexes[i+1])
+				for i := len(partials) - 1; i >= 0; i-- {
+					results = append(results, HashSidePair{Right: ((indexes[i+1] >> i) & 1) > 0, Hash: partials[i]})
+				}
+			}
+		}
+	}
+	return results
+}