added Bitcoin Cash's rpc and parser

Gopkg.lock

@@ -31,6 +31,12 @@
   packages = [".","base58","bech32"]
   revision = "501929d3d046174c3d39f0ea54ece471aa17238c"
 
+[[projects]]
+  branch = "master"
+  name = "github.com/cpacia/bchutil"
+  packages = ["."]
+  revision = "12e86f41eb040d3b85b5d8e3a3a4bed035517c52"
+
 [[projects]]
   name = "github.com/ethereum/go-ethereum"
   packages = [".","common","common/hexutil","common/math","core/types","crypto","crypto/secp256k1","crypto/sha3","ethclient","ethdb","log","metrics","params","rlp","rpc","trie"]
@@ -184,6 +190,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "a463c234bc11d9917876a827f692392845ed89571edc1484ae3e932f555d484b"
+  inputs-digest = "e632a1e904953397e9eae00f30a86bffab2d303232c7bac47a16e1ce663043bf"
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -72,3 +72,7 @@
 [[constraint]]
   name = "github.com/golang/protobuf"
   version = "1.0.0"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/cpacia/bchutil"

bchain/coins/bch/bcashparser.go

@@ -0,0 +1,75 @@
+package bch
+
+import (
+	"blockbook/bchain/coins/btc"
+	"strings"
+
+	"github.com/btcsuite/btcd/chaincfg"
+	"github.com/btcsuite/btcd/txscript"
+	"github.com/btcsuite/btcutil"
+	"github.com/cpacia/bchutil"
+)
+
+var prefixes []string
+
+func init() {
+	prefixes = make([]string, 0, len(bchutil.Prefixes))
+	for _, prefix := range bchutil.Prefixes {
+		prefixes = append(prefixes, prefix)
+	}
+}
+
+// BCashParser handle
+type BCashParser struct {
+	*btc.BitcoinParser
+}
+
+// GetChainParams contains network parameters for the main Bitcoin Cash network,
+// the regression test Bitcoin Cash network, the test Bitcoin Cash network and
+// the simulation test Bitcoin Cash network, in this order
+func GetChainParams(chain string) *chaincfg.Params {
+	var params *chaincfg.Params
+	switch chain {
+	case "test":
+		params = &chaincfg.TestNet3Params
+		params.Net = bchutil.TestnetMagic
+	case "regtest":
+		params = &chaincfg.RegressionNetParams
+		params.Net = bchutil.Regtestmagic
+	default:
+		params = &chaincfg.MainNetParams
+		params.Net = bchutil.MainnetMagic
+	}
+
+	return params
+}
+
+// GetAddrIDFromAddress returns internal address representation of given address
+func (p *BCashParser) GetAddrIDFromAddress(address string) ([]byte, error) {
+	return p.AddressToOutputScript(address)
+}
+
+// AddressToOutputScript converts bitcoin address to ScriptPubKey
+func (p *BCashParser) AddressToOutputScript(address string) ([]byte, error) {
+	if strings.Contains(address, ":") {
+		da, err := bchutil.DecodeAddress(address, p.Params)
+		if err != nil {
+			return nil, err
+		}
+		script, err := bchutil.PayToAddrScript(da)
+		if err != nil {
+			return nil, err
+		}
+		return script, nil
+	} else {
+		da, err := btcutil.DecodeAddress(address, p.Params)
+		if err != nil {
+			return nil, err
+		}
+		script, err := txscript.PayToAddrScript(da)
+		if err != nil {
+			return nil, err
+		}
+		return script, nil
+	}
+}

bchain/coins/bch/bcashrpc.go

@@ -0,0 +1,180 @@
+package bch
+
+import (
+	"blockbook/bchain"
+	"blockbook/bchain/coins/btc"
+	"encoding/hex"
+	"encoding/json"
+
+	"github.com/cpacia/bchutil"
+	"github.com/golang/glog"
+	"github.com/juju/errors"
+)
+
+// BCashRPC is an interface to JSON-RPC bitcoind service.
+type BCashRPC struct {
+	*btc.BitcoinRPC
+}
+
+// NewBCashRPC returns new BCashRPC instance.
+func NewBCashRPC(config json.RawMessage, pushHandler func(bchain.NotificationType)) (bchain.BlockChain, error) {
+	b, err := btc.NewBitcoinRPC(config, pushHandler)
+	if err != nil {
+		return nil, err
+	}
+
+	s := &BCashRPC{
+		b.(*btc.BitcoinRPC),
+	}
+
+	return s, nil
+}
+
+func (b *BCashRPC) Initialize() error {
+	b.Mempool = bchain.NewUTXOMempool(b)
+
+	chainName, err := b.GetBlockChainInfo()
+	if err != nil {
+		return err
+	}
+
+	params := GetChainParams(chainName)
+
+	// always create parser
+	b.Parser = &BCashParser{
+		&btc.BitcoinParser{
+			Params: params,
+		},
+	}
+
+	// parameters for getInfo request
+	if params.Net == bchutil.MainnetMagic {
+		b.Testnet = false
+		b.Network = "livenet"
+	} else {
+		b.Testnet = true
+		b.Network = "testnet"
+	}
+
+	glog.Info("rpc: block chain ", params.Name)
+
+	return nil
+}
+
+// getblock
+
+type cmdGetBlock struct {
+	Method string `json:"method"`
+	Params struct {
+		BlockHash string `json:"blockhash"`
+		Verbose   bool   `json:"verbose"`
+	} `json:"params"`
+}
+
+type resGetBlockRaw struct {
+	Error  *bchain.RPCError `json:"error"`
+	Result string           `json:"result"`
+}
+
+type resGetBlockThin struct {
+	Error  *bchain.RPCError `json:"error"`
+	Result bchain.ThinBlock `json:"result"`
+}
+
+// GetBlock returns block with given hash.
+func (b *BCashRPC) GetBlock(hash string, height uint32) (*bchain.Block, error) {
+	var err error
+	if hash == "" && height > 0 {
+		hash, err = b.GetBlockHash(height)
+		if err != nil {
+			return nil, err
+		}
+	}
+	// XXX
+	// // optimization
+	// if height > 0 {
+	// 	return b.getBlockWithoutHeader(hash, height)
+	// }
+	header, err := b.GetBlockHeader(hash)
+	if err != nil {
+		return nil, err
+	}
+	data, err := b.GetBlockRaw(hash)
+	if err != nil {
+		return nil, err
+	}
+	block, err := b.Parser.ParseBlock(data)
+	if err != nil {
+		return nil, errors.Annotatef(err, "hash %v", hash)
+	}
+	block.BlockHeader = *header
+	return block, nil
+}
+
+// GetBlockRaw returns block with given hash as bytes.
+func (b *BCashRPC) GetBlockRaw(hash string) ([]byte, error) {
+	glog.V(1).Info("rpc: getblock (verbose=0) ", hash)
+
+	res := resGetBlockRaw{}
+	req := cmdGetBlock{Method: "getblock"}
+	req.Params.BlockHash = hash
+	req.Params.Verbose = false
+	err := b.Call(&req, &res)
+
+	if err != nil {
+		return nil, errors.Annotatef(err, "hash %v", hash)
+	}
+	if res.Error != nil {
+		if isErrBlockNotFound(res.Error) {
+			return nil, bchain.ErrBlockNotFound
+		}
+		return nil, errors.Annotatef(res.Error, "hash %v", hash)
+	}
+	return hex.DecodeString(res.Result)
+}
+
+// GetBlockList returns block with given hash by downloading block
+// transactions one by one.
+func (b *BCashRPC) GetBlockList(hash string) (*bchain.Block, error) {
+	glog.V(1).Info("rpc: getblock (verbose=1) ", hash)
+
+	res := resGetBlockThin{}
+	req := cmdGetBlock{Method: "getblock"}
+	req.Params.BlockHash = hash
+	req.Params.Verbose = true
+	err := b.Call(&req, &res)
+
+	if err != nil {
+		return nil, errors.Annotatef(err, "hash %v", hash)
+	}
+	if res.Error != nil {
+		if isErrBlockNotFound(res.Error) {
+			return nil, bchain.ErrBlockNotFound
+		}
+		return nil, errors.Annotatef(res.Error, "hash %v", hash)
+	}
+
+	txs := make([]bchain.Tx, len(res.Result.Txids))
+	for i, txid := range res.Result.Txids {
+		tx, err := b.GetTransaction(txid)
+		if err != nil {
+			return nil, err
+		}
+		txs[i] = *tx
+	}
+	block := &bchain.Block{
+		BlockHeader: res.Result.BlockHeader,
+		Txs:         txs,
+	}
+	return block, nil
+}
+
+// GetBlockFull returns block with given hash.
+func (b *BCashRPC) GetBlockFull(hash string) (*bchain.Block, error) {
+	return nil, errors.New("Not implemented")
+}
+
+func isErrBlockNotFound(err *bchain.RPCError) bool {
+	return err.Message == "Block not found" ||
+		err.Message == "Block height out of range"
+}

bchain/coins/blockchain.go

@@ -2,6 +2,7 @@ package coins
 
 import (
 	"blockbook/bchain"
+	"blockbook/bchain/coins/bch"
 	"blockbook/bchain/coins/btc"
 	"blockbook/bchain/coins/eth"
 	"blockbook/bchain/coins/zec"
@@ -25,6 +26,8 @@ func init() {
 	blockChainFactories["zec"] = zec.NewZCashRPC
 	blockChainFactories["eth"] = eth.NewEthereumRPC
 	blockChainFactories["eth-testnet"] = eth.NewEthereumRPC
+	blockChainFactories["bch"] = bch.NewBCashRPC
+	blockChainFactories["bch-testnet"] = bch.NewBCashRPC
 }
 
 // NewBlockChain creates bchain.BlockChain of type defined by parameter coin