示例#1
0
// HeaderForWork returns a block that is ready for nonce grinding, along with
// the root hash of the block.
func (m *Miner) HeaderForWork() (types.BlockHeader, types.Target, error) {
	if !m.wallet.Unlocked() {
		return types.BlockHeader{}, types.Target{}, modules.ErrLockedWallet
	}
	lockID := m.mu.Lock()
	defer m.mu.Unlock(lockID)
	err := m.checkAddress()
	if err != nil {
		return types.BlockHeader{}, types.Target{}, err
	}

	if time.Since(m.lastBlock).Seconds() > secondsBetweenBlocks {
		m.prepareNewBlock()
	}

	// The header that will be returned for nonce grinding.
	// The header is constructed from a block and some arbitrary data. The
	// arbitrary data allows for multiple unique blocks to be generated from
	// a single block in memory. A block pointer is used in order to avoid
	// storing multiple copies of the same block in memory
	var header types.BlockHeader
	var arbData []byte
	var block *types.Block

	if m.memProgress%(headerForWorkMemory/blockForWorkMemory) == 0 {
		// Grab a new block. Allocate space for the pointer to store it as well
		block = new(types.Block)
		*block, _ = m.blockForWork()
		header = block.Header()
		arbData = block.Transactions[0].ArbitraryData[0]

		m.lastBlock = time.Now()
	} else {
		// Set block to previous block, but create new arbData
		block = m.blockMem[m.headerMem[m.memProgress-1]]
		arbData, _ = crypto.RandBytes(types.SpecifierLen)
		block.Transactions[0].ArbitraryData[0] = arbData
		header = block.Header()
	}

	// Save a mapping from the header to its block as well as from the
	// header to its arbitrary data, replacing the block that was
	// stored 'headerForWorkMemory' requests ago.
	delete(m.blockMem, m.headerMem[m.memProgress])
	delete(m.arbDataMem, m.headerMem[m.memProgress])
	m.blockMem[header] = block
	m.arbDataMem[header] = arbData
	m.headerMem[m.memProgress] = header
	m.memProgress++
	if m.memProgress == headerForWorkMemory {
		m.memProgress = 0
	}

	// Return the header and target.
	return header, m.target, nil
}
示例#2
0
// managedBroadcastBlock will broadcast a block to the consensus set's peers.
func (cs *ConsensusSet) managedBroadcastBlock(b types.Block) {
	// COMPATv0.5.1 - broadcast the block to all peers <= v0.5.1 and block header to all peers > v0.5.1.
	var relayBlockPeers, relayHeaderPeers []modules.Peer
	for _, p := range cs.gateway.Peers() {
		if build.VersionCmp(p.Version, "0.5.1") <= 0 {
			relayBlockPeers = append(relayBlockPeers, p)
		} else {
			relayHeaderPeers = append(relayHeaderPeers, p)
		}
	}
	go cs.gateway.Broadcast("RelayBlock", b, relayBlockPeers)
	go cs.gateway.Broadcast("RelayHeader", b.Header(), relayHeaderPeers)
}