merge BlockNonce (#785)

x/evm/watcher/types.go

@@ -1,6 +1,7 @@
 package watcher
 
 import (
+	"encoding/binary"
 	"encoding/json"
 	"math/big"
 	"strconv"
@@ -157,11 +158,38 @@ type MsgBlock struct {
 	block     string
 }
 
+// A BlockNonce is a 64-bit hash which proves (combined with the
+// mix-hash) that a sufficient amount of computation has been carried
+// out on a block.
+type BlockNonce [8]byte
+
+// EncodeNonce converts the given integer to a block nonce.
+func EncodeNonce(i uint64) BlockNonce {
+	var n BlockNonce
+	binary.BigEndian.PutUint64(n[:], i)
+	return n
+}
+
+// Uint64 returns the integer value of a block nonce.
+func (n BlockNonce) Uint64() uint64 {
+	return binary.BigEndian.Uint64(n[:])
+}
+
+// MarshalText encodes n as a hex string with 0x prefix.
+func (n BlockNonce) MarshalText() ([]byte, error) {
+	return hexutil.Bytes(n[:]).MarshalText()
+}
+
+// UnmarshalText implements encoding.TextUnmarshaler.
+func (n *BlockNonce) UnmarshalText(input []byte) error {
+	return hexutil.UnmarshalFixedText("BlockNonce", input, n[:])
+}
+
 type EthBlock struct {
 	Number           hexutil.Uint64 `json:"number"`
 	Hash             common.Hash    `json:"hash"`
 	ParentHash       common.Hash    `json:"parentHash"`
-	Nonce            uint64         `json:"nonce"`
+	Nonce            BlockNonce     `json:"nonce"`
 	Sha3Uncles       common.Hash    `json:"sha3Uncles"`
 	LogsBloom        ethtypes.Bloom `json:"logsBloom"`
 	TransactionsRoot common.Hash    `json:"transactionsRoot"`
@@ -185,7 +213,7 @@ func NewMsgBlock(height uint64, blockBloom ethtypes.Bloom, blockHash common.Hash
 		Number:           hexutil.Uint64(height),
 		Hash:             blockHash,
 		ParentHash:       common.BytesToHash(header.LastBlockId.Hash),
-		Nonce:            0,
+		Nonce:            BlockNonce{},
 		Sha3Uncles:       common.Hash{},
 		LogsBloom:        blockBloom,
 		TransactionsRoot: common.BytesToHash(header.DataHash),