Golang Block.Height方法代码示例

// Process block takes care of sorting out transactions with exodus output.
// At this point it doesn't matter whether the Txs are valid or not. Validation
// is done at the proper handlers.
func (s *MastercoinServer) ProcessBlock(block *btcutil.Block) error {
	// Gather transactions from this block which had an exodus output
	txPack := &TxPack{
		txs:    mscutil.GetExodusTransactions(block),
		time:   block.MsgBlock().Header.Timestamp.Unix(),
		height: block.Height(),
	}
	if len(txPack.txs) > 0 {

		/*
			TODO: We want to start persisting raw data here
			var buffer bytes.Buffer
			enc := gob.NewEncoder(&buffer)
			err := enc.Encode(txPack)
			if err != nil {
				mscutil.Logger.Fatal(err)
			}

			dec := gob.NewDecoder(&buffer)
			var pack TxPack
			err = dec.Decode(&pack)
			if err != nil {
				mscutil.Logger.Fatal(err)
			}
		*/

		// Queue the slice of transactions for further processing by the
		// message parser.
		_ = s.msgParser.ProcessTransactions(txPack)
		// mscutil.Logger.Println(messages)
	}

	return nil
}

// logBlockHeight logs a new block height as an information message to show
// progress to the user.  In order to prevent spam, it limits logging to one
// message every 10 seconds with duration and totals included.
func (b *blockManager) logBlockHeight(block *btcutil.Block) {
	b.receivedLogBlocks++
	b.receivedLogTx += int64(len(block.MsgBlock().Transactions))

	now := time.Now()
	duration := now.Sub(b.lastBlockLogTime)
	if duration < time.Second*10 {
		return
	}

	// Truncate the duration to 10s of milliseconds.
	durationMillis := int64(duration / time.Millisecond)
	tDuration := 10 * time.Millisecond * time.Duration(durationMillis/10)

	// Log information about new block height.
	blockStr := "blocks"
	if b.receivedLogBlocks == 1 {
		blockStr = "block"
	}
	txStr := "transactions"
	if b.receivedLogTx == 1 {
		txStr = "transaction"
	}
	bmgrLog.Infof("Processed %d %s in the last %s (%d %s, height %d, %s)",
		b.receivedLogBlocks, blockStr, tDuration, b.receivedLogTx,
		txStr, block.Height(), block.MsgBlock().Header.Timestamp)

	b.receivedLogBlocks = 0
	b.receivedLogTx = 0
	b.lastBlockLogTime = now
}

// Process block takes care of sorting out transactions with exodus output.
// At this point it doesn't matter whether the Txs are valid or not. Validation
// is done at the proper handlers.
func (s *MastercoinServer) ProcessBlock(block *btcutil.Block) error {

	// Gather transactions from this block which had an exodus output
	txPack := &mscutil.TxPack{
		Txs:    mscutil.GetExodusTransactions(block),
		Time:   block.MsgBlock().Header.Timestamp.Unix(),
		Height: block.Height(),
	}

	// Update Exodus Vesting
	//

	// balance = ((1-(0.5 ** time_difference)) * 5631623576222 .round(8)

	if len(txPack.Txs) > 0 {
		serializedData, err := txPack.Serialize()
		if err != nil {
			return err
		}

		s.db.CreateTxPack(txPack.Height, serializedData)

		mscutil.Logger.Println("Mastercoin data found at block with height:", txPack.Height)

		// Queue the slice of transactions for further processing by the
		// message parser.
		_ = s.msgParser.ProcessTransactions(txPack)
	}

	return nil
}

// connectTransactions updates the passed map by applying transaction and
// spend information for all the transactions in the passed block.  Only
// transactions in the passed map are updated.
func connectTransactions(txStore TxStore, block *btcutil.Block) error {
	// Loop through all of the transactions in the block to see if any of
	// them are ones we need to update and spend based on the results map.
	for _, tx := range block.Transactions() {
		// Update the transaction store with the transaction information
		// if it's one of the requested transactions.
		msgTx := tx.MsgTx()
		if txD, exists := txStore[*tx.Sha()]; exists {
			txD.Tx = tx
			txD.BlockHeight = block.Height()
			txD.Spent = make([]bool, len(msgTx.TxOut))
			txD.Err = nil
		}

		// Spend the origin transaction output.
		for _, txIn := range msgTx.TxIn {
			originHash := &txIn.PreviousOutPoint.Hash
			originIndex := txIn.PreviousOutPoint.Index
			if originTx, exists := txStore[*originHash]; exists {
				if originIndex > uint32(len(originTx.Spent)) {
					continue
				}
				originTx.Spent[originIndex] = true
			}
		}
	}

	return nil
}

// NotifyBlockConnected creates and marshalls a JSON message to notify
// of a new block connected to the main chain.  The notification is sent
// to each connected wallet.
func (s *rpcServer) NotifyBlockConnected(block *btcutil.Block) {
	hash, err := block.Sha()
	if err != nil {
		rpcsLog.Error("Bad block; connected block notification dropped.")
		return
	}

	// TODO: remove int32 type conversion.
	ntfn := btcws.NewBlockConnectedNtfn(hash.String(),
		int32(block.Height()))
	mntfn, _ := json.Marshal(ntfn)
	s.ws.walletNotificationMaster <- mntfn

	// Inform any interested parties about txs mined in this block.
	s.ws.Lock()
	for _, tx := range block.Transactions() {
		if clist, ok := s.ws.minedTxNotifications[*tx.Sha()]; ok {
			var enext *list.Element
			for e := clist.Front(); e != nil; e = enext {
				enext = e.Next()
				c := e.Value.(walletChan)
				// TODO: remove int32 type conversion after
				// the int64 -> int32 switch is made.
				ntfn := btcws.NewTxMinedNtfn(tx.Sha().String(),
					hash.String(), int32(block.Height()),
					block.MsgBlock().Header.Timestamp.Unix(),
					tx.Index())
				mntfn, _ := json.Marshal(ntfn)
				c <- mntfn
				s.ws.removeMinedTxRequest(c, tx.Sha())
			}
		}
	}
	s.ws.Unlock()
}

// newBlockNotifyCheckTxOut is a helper function to iterate through
// each transaction output of a new block and perform any checks and
// notify listening frontends when necessary.
func (s *rpcServer) newBlockNotifyCheckTxOut(block *btcutil.Block, tx *btcutil.Tx, spent []bool) {
	for wltNtfn, cxt := range s.ws.requests.m {
		for i, txout := range tx.MsgTx().TxOut {
			_, txaddrhash, err := btcscript.ScriptToAddrHash(txout.PkScript)
			if err != nil {
				log.Debug("Error getting payment address from tx; dropping any Tx notifications.")
				break
			}
			for addr, id := range cxt.txRequests {
				if !bytes.Equal(addr[:], txaddrhash) {
					continue
				}
				blkhash, err := block.Sha()
				if err != nil {
					log.Error("Error getting block sha; dropping Tx notification.")
					break
				}
				txaddr, err := btcutil.EncodeAddress(txaddrhash, s.server.btcnet)
				if err != nil {
					log.Error("Error encoding address; dropping Tx notification.")
					break
				}
				reply := &btcjson.Reply{
					Result: struct {
						Sender    string `json:"sender"`
						Receiver  string `json:"receiver"`
						BlockHash string `json:"blockhash"`
						Height    int64  `json:"height"`
						TxHash    string `json:"txhash"`
						Index     uint32 `json:"index"`
						Amount    int64  `json:"amount"`
						PkScript  string `json:"pkscript"`
						Spent     bool   `json:"spent"`
					}{
						Sender:    "Unknown", // TODO(jrick)
						Receiver:  txaddr,
						BlockHash: blkhash.String(),
						Height:    block.Height(),
						TxHash:    tx.Sha().String(),
						Index:     uint32(i),
						Amount:    txout.Value,
						PkScript:  btcutil.Base58Encode(txout.PkScript),
						Spent:     spent[i],
					},
					Error: nil,
					Id:    &id,
				}
				replyBytes, err := json.Marshal(reply)
				if err != nil {
					log.Errorf("RPCS: Unable to marshal tx notification: %v", err)
					continue
				}
				wltNtfn <- replyBytes
			}
		}
	}
}

// NotifyForTxOuts iterates through all outputs of a tx, performing any
// necessary notifications for wallets.  If a non-nil block is passed,
// additional block information is passed with the notifications.
func (s *rpcServer) NotifyForTxOuts(tx *btcutil.Tx, block *btcutil.Block) {
	// Nothing to do if nobody is listening for transaction notifications.
	if len(s.ws.txNotifications) == 0 {
		return
	}

	for i, txout := range tx.MsgTx().TxOut {
		_, addrs, _, err := btcscript.ExtractPkScriptAddrs(
			txout.PkScript, s.server.btcnet)
		if err != nil {
			continue
		}

		for _, addr := range addrs {
			// Only support pay-to-pubkey-hash right now.
			if _, ok := addr.(*btcutil.AddressPubKeyHash); !ok {
				continue
			}

			encodedAddr := addr.EncodeAddress()
			if idlist, ok := s.ws.txNotifications[encodedAddr]; ok {
				for e := idlist.Front(); e != nil; e = e.Next() {
					n := e.Value.(ntfnChan)

					ntfn := &btcws.ProcessedTxNtfn{
						Receiver:   encodedAddr,
						TxID:       tx.Sha().String(),
						TxOutIndex: uint32(i),
						Amount:     txout.Value,
						PkScript:   hex.EncodeToString(txout.PkScript),
						// TODO(jrick): hardcoding unspent is WRONG and needs
						// to be either calculated from other block txs, or dropped.
						Spent: false,
					}

					if block != nil {
						blkhash, err := block.Sha()
						if err != nil {
							rpcsLog.Error("Error getting block sha; dropping Tx notification")
							break
						}
						ntfn.BlockHeight = int32(block.Height())
						ntfn.BlockHash = blkhash.String()
						ntfn.BlockIndex = tx.Index()
						ntfn.BlockTime = block.MsgBlock().Header.Timestamp.Unix()
					} else {
						ntfn.BlockHeight = -1
						ntfn.BlockIndex = -1
					}

					n <- ntfn
				}
			}
		}
	}
}

// CheckConnectBlock performs several checks to confirm connecting the passed
// block to the main chain does not violate any rules.  An example of some of
// the checks performed are ensuring connecting the block would not cause any
// duplicate transaction hashes for old transactions that aren't already fully
// spent, double spends, exceeding the maximum allowed signature operations
// per block, invalid values in relation to the expected block subisidy, or
// fail transaction script validation.
//
// This function is NOT safe for concurrent access.
func (b *BlockChain) CheckConnectBlock(block *btcutil.Block) error {
	prevNode := b.bestChain
	blockSha, _ := block.Sha()
	newNode := newBlockNode(&block.MsgBlock().Header, blockSha, block.Height())
	if prevNode != nil {
		newNode.parent = prevNode
		newNode.workSum.Add(prevNode.workSum, newNode.workSum)
	}

	return b.checkConnectBlock(newNode, block)
}

// NotifyBlockConnected creates and marshalls a JSON message to notify
// of a new block connected to the main chain.  The notification is sent
// to each connected wallet.
func (s *rpcServer) NotifyBlockConnected(block *btcutil.Block) {
	s.ws.walletListeners.RLock()
	for wltNtfn := range s.ws.walletListeners.m {
		// Create notification with basic information filled in.
		// This data is the same for every connected wallet.
		hash, err := block.Sha()
		if err != nil {
			log.Error("Bad block; connected block notification dropped.")
			return
		}
		ntfnResult := struct {
			Hash     string   `json:"hash"`
			Height   int64    `json:"height"`
			MinedTXs []string `json:"minedtxs"`
		}{
			Hash:   hash.String(),
			Height: block.Height(),
		}

		// Fill in additional wallet-specific notifications.  If there
		// is no request context for this wallet, no need to give this
		// wallet any extra notifications.
		if cxt := s.ws.requests.m[wltNtfn]; cxt != nil {
			// Create list of all txs created by this wallet that appear in this
			// block.
			minedTxShas := make([]string, 0, len(cxt.minedTxRequests))

			// TxShas does not return a non-nil error.
			txShaList, _ := block.TxShas()
			txList := s.server.db.FetchTxByShaList(txShaList)
			for _, txReply := range txList {
				if txReply.Err != nil {
					continue
				}
				if _, ok := cxt.minedTxRequests[*txReply.Sha]; ok {
					minedTxShas = append(minedTxShas, txReply.Sha.String())
					s.ws.requests.RemoveMinedTxRequest(wltNtfn, txReply.Sha)
				}
			}

			ntfnResult.MinedTXs = minedTxShas
		}

		var id interface{} = "btcd:blockconnected"
		ntfn := btcjson.Reply{
			Result: ntfnResult,
			Id:     &id,
		}
		m, _ := json.Marshal(ntfn)
		wltNtfn <- m
	}
	s.ws.walletListeners.RUnlock()
}

// NotifyBlockDisconnected creates and marshals a JSON message to notify
// of a new block disconnected from the main chain.  The notification is sent
// to each connected wallet.
func (s *rpcServer) NotifyBlockDisconnected(block *btcutil.Block) {
	hash, err := block.Sha()
	if err != nil {
		rpcsLog.Error("Bad block; connected block notification dropped.")
		return
	}

	// TODO: remove int32 type conversion.
	ntfn := btcws.NewBlockDisconnectedNtfn(hash.String(),
		int32(block.Height()))
	mntfn, _ := json.Marshal(ntfn)
	s.ws.walletNotificationMaster <- mntfn
}

// NotifyBlockDisconnected creates and marshals a JSON message to notify
// of a new block disconnected from the main chain.  The notification is sent
// to each connected wallet.
func (s *rpcServer) NotifyBlockDisconnected(block *btcutil.Block) {
	hash, err := block.Sha()
	if err != nil {
		rpcsLog.Error("Bad block; connected block notification dropped")
		return
	}

	// TODO: remove int32 type conversion.
	ntfn := btcws.NewBlockDisconnectedNtfn(hash.String(),
		int32(block.Height()))
	for ntfnChan, rc := range s.ws.connections {
		if rc.blockUpdates {
			ntfnChan <- ntfn
		}
	}
}

// NotifyBlockDisconnected creates and marshals a JSON message to notify
// of a new block disconnected from the main chain.  The notification is sent
// to each connected wallet.
func (s *rpcServer) NotifyBlockDisconnected(block *btcutil.Block) {
	var id interface{} = "btcd:blockdisconnected"
	hash, err := block.Sha()
	if err != nil {
		log.Error("Bad block; connected block notification dropped.")
		return
	}
	ntfn := btcjson.Reply{
		Result: struct {
			Hash   string `json:"hash"`
			Height int64  `json:"height"`
		}{
			Hash:   hash.String(),
			Height: block.Height(),
		},
		Id: &id,
	}
	m, _ := json.Marshal(ntfn)
	s.ws.walletNotificationMaster <- m
}

// createTxRawResult converts the passed transaction and associated parameters
// to a raw transaction JSON object.
func createTxRawResult(net btcwire.BitcoinNet, txSha string, mtx *btcwire.MsgTx, blk *btcutil.Block, maxidx int64, blksha *btcwire.ShaHash) (*btcjson.TxRawResult, error) {
	mtxHex, err := messageToHex(mtx)
	if err != nil {
		return nil, err
	}

	vin, err := createVinList(mtx)
	if err != nil {
		return nil, err
	}
	vout, err := createVoutList(mtx, net)
	if err != nil {
		return nil, err
	}

	txReply := &btcjson.TxRawResult{
		Hex:      mtxHex,
		Txid:     txSha,
		Vout:     vout,
		Vin:      vin,
		Version:  mtx.Version,
		LockTime: mtx.LockTime,
	}

	if blk != nil {
		blockHeader := &blk.MsgBlock().Header
		idx := blk.Height()

		// This is not a typo, they are identical in bitcoind as well.
		txReply.Time = blockHeader.Timestamp.Unix()
		txReply.Blocktime = blockHeader.Timestamp.Unix()
		txReply.BlockHash = blksha.String()
		txReply.Confirmations = uint64(1 + maxidx - idx)
	}

	return txReply, nil
}

// IsCheckpointCandidate returns whether or not the passed block is a good
// checkpoint candidate.
//
// The factors used to determine a good checkpoint are:
//  - The block must be in the main chain
//  - The block must be at least 'CheckpointConfirmations' blocks prior to the
//    current end of the main chain
//  - The timestamps for the blocks before and after the checkpoint must have
//    timestamps which are also before and after the checkpoint, respectively
//    (due to the median time allowance this is not always the case)
//  - The block must not contain any strange transaction such as those with
//    nonstandard scripts
func (b *BlockChain) IsCheckpointCandidate(block *btcutil.Block) (bool, error) {
	// Checkpoints must be enabled.
	if b.noCheckpoints {
		return false, fmt.Errorf("checkpoints are disabled")
	}

	blockHash, err := block.Sha()
	if err != nil {
		return false, err
	}

	// A checkpoint must be in the main chain.
	if !b.db.ExistsSha(blockHash) {
		return false, nil
	}

	// A checkpoint must be at least CheckpointConfirmations blocks before
	// the end of the main chain.
	blockHeight := block.Height()
	_, mainChainHeight, err := b.db.NewestSha()
	if err != nil {
		return false, err
	}
	if blockHeight > (mainChainHeight - CheckpointConfirmations) {
		return false, nil
	}

	// Get the previous block.
	prevHash := &block.MsgBlock().Header.PrevBlock
	prevBlock, err := b.db.FetchBlockBySha(prevHash)
	if err != nil {
		return false, err
	}

	// Get the next block.
	nextHash, err := b.db.FetchBlockShaByHeight(blockHeight + 1)
	if err != nil {
		return false, err
	}
	nextBlock, err := b.db.FetchBlockBySha(nextHash)
	if err != nil {
		return false, err
	}

	// A checkpoint must have timestamps for the block and the blocks on
	// either side of it in order (due to the median time allowance this is
	// not always the case).
	prevTime := prevBlock.MsgBlock().Header.Timestamp
	curTime := block.MsgBlock().Header.Timestamp
	nextTime := nextBlock.MsgBlock().Header.Timestamp
	if prevTime.After(curTime) || nextTime.Before(curTime) {
		return false, nil
	}

	// A checkpoint must have transactions that only contain standard
	// scripts.
	for _, tx := range block.Transactions() {
		if isNonstandardTransaction(tx) {
			return false, nil
		}
	}

	return true, nil
}

// rescanBlock rescans all transactions in a single block.  This is a
// helper function for handleRescan.
func rescanBlock(s *rpcServer, cmd *btcws.RescanCmd, c handlerChans, blk *btcutil.Block) {
	for _, tx := range blk.Transactions() {
		var txReply *btcdb.TxListReply
	txouts:
		for txOutIdx, txout := range tx.MsgTx().TxOut {
			_, addrs, _, err := btcscript.ExtractPkScriptAddrs(
				txout.PkScript, s.server.btcnet)
			if err != nil {
				continue txouts
			}

			for _, addr := range addrs {
				encodedAddr := addr.EncodeAddress()
				if _, ok := cmd.Addresses[encodedAddr]; !ok {
					continue
				}
				// TODO(jrick): This lookup is expensive and can be avoided
				// if the wallet is sent the previous outpoints for all inputs
				// of the tx, so any can removed from the utxo set (since
				// they are, as of this tx, now spent).
				if txReply == nil {
					txReplyList, err := s.server.db.FetchTxBySha(tx.Sha())
					if err != nil {
						rpcsLog.Errorf("Tx Sha %v not found by db", tx.Sha())
						continue txouts
					}
					for i := range txReplyList {
						if txReplyList[i].Height == blk.Height() {
							txReply = txReplyList[i]
							break
						}
					}

				}

				// Sha never errors.
				blksha, _ := blk.Sha()

				ntfn := &btcws.ProcessedTxNtfn{
					Receiver:    encodedAddr,
					Amount:      txout.Value,
					TxID:        tx.Sha().String(),
					TxOutIndex:  uint32(txOutIdx),
					PkScript:    hex.EncodeToString(txout.PkScript),
					BlockHash:   blksha.String(),
					BlockHeight: int32(blk.Height()),
					BlockIndex:  tx.Index(),
					BlockTime:   blk.MsgBlock().Header.Timestamp.Unix(),
					Spent:       txReply.TxSpent[txOutIdx],
				}

				select {
				case <-c.disconnected:
					return

				default:
					c.n <- ntfn
				}
			}
		}
	}
}