8559b8742d
This creates rpcserver.Chain and rpcserver.UtxoEntry interfaces and respective rpcChain and rpcUtxoEntry adaptors that implement those interfaces. This starts to decouple rpcserver from the concrete BlockChain implementation and allows for mocking those interfaces when testing rpcserver handlers.
241 lines
6.8 KiB
Go
241 lines
6.8 KiB
Go
// Copyright (c) 2013-2014 The btcsuite developers
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// Copyright (c) 2015-2019 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package blockchain
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import (
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"fmt"
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"github.com/decred/dcrd/chaincfg/chainhash"
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"github.com/decred/dcrd/database/v2"
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"github.com/decred/dcrd/dcrutil/v3"
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"github.com/decred/dcrd/txscript/v3"
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)
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// NextLotteryData returns the next tickets eligible for spending as SSGen
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// on the top block. It also returns the ticket pool size and the PRNG
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// state checksum.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) NextLotteryData() ([]chainhash.Hash, int, [6]byte, error) {
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b.chainLock.RLock()
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defer b.chainLock.RUnlock()
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tipStakeNode := b.bestChain.Tip().stakeNode
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return tipStakeNode.Winners(), tipStakeNode.PoolSize(),
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tipStakeNode.FinalState(), nil
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}
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// lotteryDataForNode is a helper function that returns winning tickets
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// along with the ticket pool size and PRNG checksum for a given node.
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//
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// This function is NOT safe for concurrent access and MUST be called
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// with the chainLock held for writes.
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func (b *BlockChain) lotteryDataForNode(node *blockNode) ([]chainhash.Hash, int, [6]byte, error) {
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if node.height < b.chainParams.StakeEnabledHeight {
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return nil, 0, [6]byte{}, nil
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}
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stakeNode, err := b.fetchStakeNode(node)
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if err != nil {
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return nil, 0, [6]byte{}, err
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}
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return stakeNode.Winners(), stakeNode.PoolSize(), stakeNode.FinalState(), nil
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}
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// lotteryDataForBlock takes a node block hash and returns the next tickets
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// eligible for voting, the number of tickets in the ticket pool, and the
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// final state of the PRNG.
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//
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// This function is NOT safe for concurrent access and must have the chainLock
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// held for write access.
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func (b *BlockChain) lotteryDataForBlock(hash *chainhash.Hash) ([]chainhash.Hash, int, [6]byte, error) {
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node := b.index.LookupNode(hash)
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if node == nil {
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return nil, 0, [6]byte{}, fmt.Errorf("block %s is not known", hash)
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}
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winningTickets, poolSize, finalState, err := b.lotteryDataForNode(node)
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if err != nil {
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return nil, 0, [6]byte{}, err
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}
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return winningTickets, poolSize, finalState, nil
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}
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// LotteryDataForBlock returns lottery data for a given block in the block
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// chain, including side chain blocks.
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//
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// It is safe for concurrent access.
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func (b *BlockChain) LotteryDataForBlock(hash *chainhash.Hash) ([]chainhash.Hash, int, [6]byte, error) {
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b.chainLock.Lock()
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winningTickets, poolSize, finalState, err := b.lotteryDataForBlock(hash)
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b.chainLock.Unlock()
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return winningTickets, poolSize, finalState, err
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}
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// LiveTickets returns all currently live tickets from the stake database.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) LiveTickets() ([]chainhash.Hash, error) {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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return sn.LiveTickets(), nil
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}
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// MissedTickets returns all currently missed tickets from the stake database.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) MissedTickets() ([]chainhash.Hash, error) {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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return sn.MissedTickets(), nil
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}
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// TicketsWithAddress returns a slice of ticket hashes that are currently live
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// corresponding to the given address.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) TicketsWithAddress(address dcrutil.Address) ([]chainhash.Hash, error) {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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tickets := sn.LiveTickets()
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var ticketsWithAddr []chainhash.Hash
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err := b.db.View(func(dbTx database.Tx) error {
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for _, hash := range tickets {
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utxo, err := dbFetchUtxoEntry(dbTx, &hash)
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if err != nil {
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return err
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}
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_, addrs, _, err :=
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txscript.ExtractPkScriptAddrs(utxo.ScriptVersionByIndex(0),
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utxo.PkScriptByIndex(0), b.chainParams)
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if err != nil {
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return err
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}
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if addrs[0].Address() == address.Address() {
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ticketsWithAddr = append(ticketsWithAddr, hash)
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}
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return ticketsWithAddr, nil
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}
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// CheckLiveTicket returns whether or not a ticket exists in the live ticket
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// treap of the best node.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) CheckLiveTicket(hash chainhash.Hash) bool {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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return sn.ExistsLiveTicket(hash)
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}
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// CheckLiveTickets returns a slice of bools representing whether each ticket
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// exists in the live ticket treap of the best node.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) CheckLiveTickets(hashes []chainhash.Hash) []bool {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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existsSlice := make([]bool, len(hashes))
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for i := range hashes {
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existsSlice[i] = sn.ExistsLiveTicket(hashes[i])
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}
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return existsSlice
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}
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// CheckMissedTickets returns a slice of bools representing whether each ticket
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// hash has been missed in the live ticket treap of the best node.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) CheckMissedTickets(hashes []chainhash.Hash) []bool {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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existsSlice := make([]bool, len(hashes))
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for i := range hashes {
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existsSlice[i] = sn.ExistsMissedTicket(hashes[i])
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}
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return existsSlice
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}
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// CheckExpiredTicket returns whether or not a ticket was ever expired.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) CheckExpiredTicket(hash chainhash.Hash) bool {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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return sn.ExistsExpiredTicket(hash)
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}
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// CheckExpiredTickets returns whether or not a ticket in a slice of
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// tickets was ever expired.
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//
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// This function is safe for concurrent access.
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func (b *BlockChain) CheckExpiredTickets(hashes []chainhash.Hash) []bool {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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existsSlice := make([]bool, len(hashes))
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for i := range hashes {
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existsSlice[i] = sn.ExistsExpiredTicket(hashes[i])
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}
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return existsSlice
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}
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// TicketPoolValue returns the current value of all the locked funds in the
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// ticket pool.
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//
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// This function is safe for concurrent access. All live tickets are at least
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// 256 blocks deep on mainnet, so the UTXO set should generally always have
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// the asked for transactions.
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func (b *BlockChain) TicketPoolValue() (dcrutil.Amount, error) {
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b.chainLock.RLock()
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sn := b.bestChain.Tip().stakeNode
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b.chainLock.RUnlock()
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var amt int64
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err := b.db.View(func(dbTx database.Tx) error {
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for _, hash := range sn.LiveTickets() {
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utxo, err := dbFetchUtxoEntry(dbTx, &hash)
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if err != nil {
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return err
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}
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amt += utxo.sparseOutputs[0].amount
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}
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return nil
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})
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if err != nil {
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return 0, err
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}
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return dcrutil.Amount(amt), nil
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}
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