elements/src/interfaces/wallet.cpp

// Copyright (c) 2018 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <interfaces/wallet.h>

#include <amount.h>
#include <consensus/validation.h>
#include <interfaces/chain.h>
#include <interfaces/handler.h>
#include <policy/feerate.h>
#include <policy/fees.h>
#include <primitives/transaction.h>
#include <script/standard.h>
#include <support/allocators/secure.h>
#include <sync.h>
#include <ui_interface.h>
#include <uint256.h>
#include <util/system.h>
#include <wallet/feebumper.h>
#include <wallet/fees.h>
#include <wallet/ismine.h>
#include <wallet/rpcwallet.h>
#include <wallet/load.h>
#include <wallet/wallet.h>
#include <wallet/walletutil.h>

#include <memory>
#include <string>
#include <utility>
#include <vector>

namespace interfaces {
namespace {

//! Construct wallet tx struct.
WalletTx MakeWalletTx(interfaces::Chain::Lock& locked_chain, CWallet& wallet, const CWalletTx& wtx)
{
    WalletTx result;
    result.tx = wtx.tx;
    result.txin_is_mine.reserve(wtx.tx->vin.size());
    result.txin_issuance_asset.resize(wtx.tx->vin.size());
    result.txin_issuance_token.resize(wtx.tx->vin.size());
    for (unsigned int i = 0; i < wtx.tx->vin.size(); ++i) {
        const auto& txin = wtx.tx->vin[i];
        result.txin_is_mine.emplace_back(wallet.IsMine(txin));
        wtx.GetIssuanceAssets(i, &result.txin_issuance_asset[i], &result.txin_issuance_token[i]);
        result.txin_issuance_asset_amount.emplace_back(wtx.GetIssuanceAmount(i, false));
        result.txin_issuance_token_amount.emplace_back(wtx.GetIssuanceAmount(i, true));
    }
    result.txout_is_mine.reserve(wtx.tx->vout.size());
    result.txout_address.reserve(wtx.tx->vout.size());
    result.txout_address_is_mine.reserve(wtx.tx->vout.size());
    for (const auto& txout : wtx.tx->vout) {
        result.txout_is_mine.emplace_back(wallet.IsMine(txout));
        result.txout_address.emplace_back();
        result.txout_address_is_mine.emplace_back(ExtractDestination(txout.scriptPubKey, result.txout_address.back()) ?
                                                      IsMine(wallet, result.txout_address.back()) :
                                                      ISMINE_NO);
        result.txout_is_change.push_back(wallet.IsChange(txout));
    }
    // ELEMENTS: Retrieve unblinded information about outputs
    for (unsigned int i = 0; i < wtx.tx->vout.size(); ++i) {
        result.txout_amounts.emplace_back(wtx.GetOutputValueOut(i));
        result.txout_assets.emplace_back(wtx.GetOutputAsset(i));
    }
    result.credit = wtx.GetCredit(locked_chain, ISMINE_ALL);
    result.debit = wtx.GetDebit(ISMINE_ALL);
    result.change = wtx.GetChange();
    result.time = wtx.GetTxTime();
    result.value_map = wtx.mapValue;
    result.is_coinbase = wtx.IsCoinBase();
    return result;
}

//! Construct wallet tx status struct.
WalletTxStatus MakeWalletTxStatus(interfaces::Chain::Lock& locked_chain, const CWalletTx& wtx)
{
    WalletTxStatus result;
    result.block_height = locked_chain.getBlockHeight(wtx.hashBlock).get_value_or(std::numeric_limits<int>::max());
    result.blocks_to_maturity = wtx.GetBlocksToMaturity(locked_chain);
    result.depth_in_main_chain = wtx.GetDepthInMainChain(locked_chain);
    result.time_received = wtx.nTimeReceived;
    result.lock_time = wtx.tx->nLockTime;
    result.is_final = locked_chain.checkFinalTx(*wtx.tx);
    result.is_trusted = wtx.IsTrusted(locked_chain);
    result.is_abandoned = wtx.isAbandoned();
    result.is_coinbase = wtx.IsCoinBase();
    result.is_in_main_chain = wtx.IsInMainChain(locked_chain);
    return result;
}

//! Construct wallet TxOut struct.
WalletTxOut MakeWalletTxOut(interfaces::Chain::Lock& locked_chain,
    CWallet& wallet,
    const CWalletTx& wtx,
    int n,
    int depth) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
{
    WalletTxOut result;
    result.txout = wtx.tx->vout[n];
    result.time = wtx.GetTxTime();
    result.depth_in_main_chain = depth;
    result.is_spent = wallet.IsSpent(locked_chain, wtx.GetHash(), n);
    return result;
}

class WalletImpl : public Wallet
{
public:
    explicit WalletImpl(const std::shared_ptr<CWallet>& wallet) : m_wallet(wallet) {}

    bool encryptWallet(const SecureString& wallet_passphrase) override
    {
        return m_wallet->EncryptWallet(wallet_passphrase);
    }
    bool isCrypted() override { return m_wallet->IsCrypted(); }
    bool lock() override { return m_wallet->Lock(); }
    bool unlock(const SecureString& wallet_passphrase) override { return m_wallet->Unlock(wallet_passphrase); }
    bool isLocked() override { return m_wallet->IsLocked(); }
    bool changeWalletPassphrase(const SecureString& old_wallet_passphrase,
        const SecureString& new_wallet_passphrase) override
    {
        return m_wallet->ChangeWalletPassphrase(old_wallet_passphrase, new_wallet_passphrase);
    }
    void abortRescan() override { m_wallet->AbortRescan(); }
    bool backupWallet(const std::string& filename) override { return m_wallet->BackupWallet(filename); }
    std::string getWalletName() override { return m_wallet->GetName(); }
    bool getNewDestination(const OutputType type, const std::string label, CTxDestination& dest, bool add_blinding_key = false) override
    {
        LOCK(m_wallet->cs_wallet);
        std::string error;
        return m_wallet->GetNewDestination(type, label, dest, error, add_blinding_key);
    }
    bool getPubKey(const CKeyID& address, CPubKey& pub_key) override { return m_wallet->GetPubKey(address, pub_key); }
    bool getPrivKey(const CKeyID& address, CKey& key) override { return m_wallet->GetKey(address, key); }
    bool isSpendable(const CTxDestination& dest) override { return IsMine(*m_wallet, dest) & ISMINE_SPENDABLE; }
    bool haveWatchOnly() override { return m_wallet->HaveWatchOnly(); };
    bool setAddressBook(const CTxDestination& dest, const std::string& name, const std::string& purpose) override
    {
        return m_wallet->SetAddressBook(dest, name, purpose);
    }
    bool delAddressBook(const CTxDestination& dest) override
    {
        return m_wallet->DelAddressBook(dest);
    }
    bool getAddress(const CTxDestination& dest,
        std::string* name,
        isminetype* is_mine,
        std::string* purpose) override
    {
        LOCK(m_wallet->cs_wallet);
        auto it = m_wallet->mapAddressBook.find(dest);
        if (it == m_wallet->mapAddressBook.end()) {
            return false;
        }
        if (name) {
            *name = it->second.name;
        }
        if (is_mine) {
            *is_mine = IsMine(*m_wallet, dest);
        }
        if (purpose) {
            *purpose = it->second.purpose;
        }
        return true;
    }
    std::vector<WalletAddress> getAddresses() override
    {
        LOCK(m_wallet->cs_wallet);
        std::vector<WalletAddress> result;
        for (const auto& item : m_wallet->mapAddressBook) {
            result.emplace_back(item.first, IsMine(*m_wallet, item.first), item.second.name, item.second.purpose);
        }
        return result;
    }
    void learnRelatedScripts(const CPubKey& key, OutputType type) override { m_wallet->LearnRelatedScripts(key, type); }
    bool addDestData(const CTxDestination& dest, const std::string& key, const std::string& value) override
    {
        LOCK(m_wallet->cs_wallet);
        return m_wallet->AddDestData(dest, key, value);
    }
    bool eraseDestData(const CTxDestination& dest, const std::string& key) override
    {
        LOCK(m_wallet->cs_wallet);
        return m_wallet->EraseDestData(dest, key);
    }
    std::vector<std::string> getDestValues(const std::string& prefix) override
    {
        LOCK(m_wallet->cs_wallet);
        return m_wallet->GetDestValues(prefix);
    }
    void lockCoin(const COutPoint& output) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->LockCoin(output);
    }
    void unlockCoin(const COutPoint& output) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->UnlockCoin(output);
    }
    bool isLockedCoin(const COutPoint& output) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->IsLockedCoin(output.hash, output.n);
    }
    void listLockedCoins(std::vector<COutPoint>& outputs) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->ListLockedCoins(outputs);
    }
    CTransactionRef createTransaction(const std::vector<CRecipient>& recipients,
        const CCoinControl& coin_control,
        bool sign,
        int& change_pos,
        CAmount& fee,
        std::vector<CAmount>& out_amounts,
        std::string& fail_reason) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        CTransactionRef tx;
        if (!m_wallet->CreateTransaction(*locked_chain, recipients, tx, fee, change_pos,
                fail_reason, coin_control, sign)) {
            return {};
        }
        // FIXME this obviously-broken logic matches the state of the codebase after 0.18 rebase and was fixed in #693 (Sep 2019) which we will get to before the 0.19 branchpoint, I promise --asp
        BlindDetails blind_details;
        out_amounts = blind_details.o_amounts;
        return tx;
    }
    bool commitTransaction(CTransactionRef tx,
        WalletValueMap value_map,
        WalletOrderForm order_form,
        std::string& reject_reason) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        CValidationState state;
        if (!m_wallet->CommitTransaction(std::move(tx), std::move(value_map), std::move(order_form), state)) {
            reject_reason = state.GetRejectReason();
            return false;
        }
        return true;
    }
    bool transactionCanBeAbandoned(const uint256& txid) override { return m_wallet->TransactionCanBeAbandoned(txid); }
    bool abandonTransaction(const uint256& txid) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->AbandonTransaction(*locked_chain, txid);
    }
    bool transactionCanBeBumped(const uint256& txid) override
    {
        return feebumper::TransactionCanBeBumped(m_wallet.get(), txid);
    }
    bool createBumpTransaction(const uint256& txid,
        const CCoinControl& coin_control,
        CAmount total_fee,
        std::vector<std::string>& errors,
        CAmount& old_fee,
        CAmount& new_fee,
        CMutableTransaction& mtx) override
    {
        if (total_fee > 0) {
            return feebumper::CreateTotalBumpTransaction(m_wallet.get(), txid, coin_control, total_fee, errors, old_fee, new_fee, mtx) ==
                feebumper::Result::OK;
        } else {
            return feebumper::CreateRateBumpTransaction(m_wallet.get(), txid, coin_control, errors, old_fee, new_fee, mtx) ==
                feebumper::Result::OK;
        }
    }
    bool signBumpTransaction(CMutableTransaction& mtx) override { return feebumper::SignTransaction(m_wallet.get(), mtx); }
    bool commitBumpTransaction(const uint256& txid,
        CMutableTransaction&& mtx,
        std::vector<std::string>& errors,
        uint256& bumped_txid) override
    {
        return feebumper::CommitTransaction(m_wallet.get(), txid, std::move(mtx), errors, bumped_txid) ==
               feebumper::Result::OK;
    }
    CTransactionRef getTx(const uint256& txid) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        auto mi = m_wallet->mapWallet.find(txid);
        if (mi != m_wallet->mapWallet.end()) {
            return mi->second.tx;
        }
        return {};
    }
    WalletTx getWalletTx(const uint256& txid) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        auto mi = m_wallet->mapWallet.find(txid);
        if (mi != m_wallet->mapWallet.end()) {
            return MakeWalletTx(*locked_chain, *m_wallet, mi->second);
        }
        return {};
    }
    std::vector<WalletTx> getWalletTxs() override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        std::vector<WalletTx> result;
        result.reserve(m_wallet->mapWallet.size());
        for (const auto& entry : m_wallet->mapWallet) {
            result.emplace_back(MakeWalletTx(*locked_chain, *m_wallet, entry.second));
        }
        return result;
    }
    bool tryGetTxStatus(const uint256& txid,
        interfaces::WalletTxStatus& tx_status,
        int& num_blocks,
        int64_t& block_time) override
    {
        auto locked_chain = m_wallet->chain().lock(true /* try_lock */);
        if (!locked_chain) {
            return false;
        }
        TRY_LOCK(m_wallet->cs_wallet, locked_wallet);
        if (!locked_wallet) {
            return false;
        }
        auto mi = m_wallet->mapWallet.find(txid);
        if (mi == m_wallet->mapWallet.end()) {
            return false;
        }
        if (Optional<int> height = locked_chain->getHeight()) {
            num_blocks = *height;
            block_time = locked_chain->getBlockTime(*height);
        } else {
            num_blocks = -1;
            block_time = -1;
        }
        tx_status = MakeWalletTxStatus(*locked_chain, mi->second);
        return true;
    }
    WalletTx getWalletTxDetails(const uint256& txid,
        WalletTxStatus& tx_status,
        WalletOrderForm& order_form,
        bool& in_mempool,
        int& num_blocks) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        auto mi = m_wallet->mapWallet.find(txid);
        if (mi != m_wallet->mapWallet.end()) {
            num_blocks = locked_chain->getHeight().get_value_or(-1);
            in_mempool = mi->second.InMempool();
            order_form = mi->second.vOrderForm;
            tx_status = MakeWalletTxStatus(*locked_chain, mi->second);
            return MakeWalletTx(*locked_chain, *m_wallet, mi->second);
        }
        return {};
    }
    WalletBalances getBalances() override
    {
        const auto bal = m_wallet->GetBalance();
        WalletBalances result;
        result.balance = bal.m_mine_trusted;
        result.unconfirmed_balance = bal.m_mine_untrusted_pending;
        result.immature_balance = bal.m_mine_immature;
        result.have_watch_only = m_wallet->HaveWatchOnly();
        if (result.have_watch_only) {
            result.watch_only_balance = bal.m_watchonly_trusted;
            result.unconfirmed_watch_only_balance = bal.m_watchonly_untrusted_pending;
            result.immature_watch_only_balance = bal.m_watchonly_immature;
        }
        return result;
    }
    bool tryGetBalances(WalletBalances& balances, int& num_blocks) override
    {
        auto locked_chain = m_wallet->chain().lock(true /* try_lock */);
        if (!locked_chain) return false;
        TRY_LOCK(m_wallet->cs_wallet, locked_wallet);
        if (!locked_wallet) {
            return false;
        }
        balances = getBalances();
        num_blocks = locked_chain->getHeight().get_value_or(-1);
        return true;
    }
    CAmountMap getBalance() override { return m_wallet->GetBalance().m_mine_trusted; }
    CAmountMap getAvailableBalance(const CCoinControl& coin_control) override
    {
        return m_wallet->GetAvailableBalance(&coin_control);
    }
    isminetype txinIsMine(const CTxIn& txin) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->IsMine(txin);
    }
    isminetype txoutIsMine(const CTxOut& txout) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->IsMine(txout);
    }
    CAmountMap getDebit(const CTxIn& txin, isminefilter filter) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->GetDebit(txin, filter);
    }
    CAmountMap getCredit(const CTransaction& tx, const size_t out_index, isminefilter filter) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        return m_wallet->GetCredit(tx, out_index, filter);
    }
    CoinsList listCoins() override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        CoinsList result;
        for (const auto& entry : m_wallet->ListCoins(*locked_chain)) {
            auto& group = result[entry.first];
            for (const auto& coin : entry.second) {
                group.emplace_back(COutPoint(coin.tx->GetHash(), coin.i),
                    MakeWalletTxOut(*locked_chain, *m_wallet, *coin.tx, coin.i, coin.nDepth));
            }
        }
        return result;
    }
    std::vector<WalletTxOut> getCoins(const std::vector<COutPoint>& outputs) override
    {
        auto locked_chain = m_wallet->chain().lock();
        LOCK(m_wallet->cs_wallet);
        std::vector<WalletTxOut> result;
        result.reserve(outputs.size());
        for (const auto& output : outputs) {
            result.emplace_back();
            auto it = m_wallet->mapWallet.find(output.hash);
            if (it != m_wallet->mapWallet.end()) {
                int depth = it->second.GetDepthInMainChain(*locked_chain);
                if (depth >= 0) {
                    result.back() = MakeWalletTxOut(*locked_chain, *m_wallet, it->second, output.n, depth);
                }
            }
        }
        return result;
    }
    CAmount getRequiredFee(unsigned int tx_bytes) override { return GetRequiredFee(*m_wallet, tx_bytes); }
    CAmount getMinimumFee(unsigned int tx_bytes,
        const CCoinControl& coin_control,
        int* returned_target,
        FeeReason* reason) override
    {
        FeeCalculation fee_calc;
        CAmount result;
        result = GetMinimumFee(*m_wallet, tx_bytes, coin_control, &fee_calc);
        if (returned_target) *returned_target = fee_calc.returnedTarget;
        if (reason) *reason = fee_calc.reason;
        return result;
    }
    unsigned int getConfirmTarget() override { return m_wallet->m_confirm_target; }
    bool hdEnabled() override { return m_wallet->IsHDEnabled(); }
    bool canGetAddresses() override { return m_wallet->CanGetAddresses(); }
    bool IsWalletFlagSet(uint64_t flag) override { return m_wallet->IsWalletFlagSet(flag); }
    OutputType getDefaultAddressType() override { return m_wallet->m_default_address_type; }
    OutputType getDefaultChangeType() override { return m_wallet->m_default_change_type; }
    CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }
    void remove() override
    {
        RemoveWallet(m_wallet);
    }
    std::unique_ptr<Handler> handleUnload(UnloadFn fn) override
    {
        return MakeHandler(m_wallet->NotifyUnload.connect(fn));
    }
    std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) override
    {
        return MakeHandler(m_wallet->ShowProgress.connect(fn));
    }
    std::unique_ptr<Handler> handleStatusChanged(StatusChangedFn fn) override
    {
        return MakeHandler(m_wallet->NotifyStatusChanged.connect([fn](CWallet*) { fn(); }));
    }
    std::unique_ptr<Handler> handleAddressBookChanged(AddressBookChangedFn fn) override
    {
        return MakeHandler(m_wallet->NotifyAddressBookChanged.connect(
            [fn](CWallet*, const CTxDestination& address, const std::string& label, bool is_mine,
                const std::string& purpose, ChangeType status) { fn(address, label, is_mine, purpose, status); }));
    }
    std::unique_ptr<Handler> handleTransactionChanged(TransactionChangedFn fn) override
    {
        return MakeHandler(m_wallet->NotifyTransactionChanged.connect(
            [fn](CWallet*, const uint256& txid, ChangeType status) { fn(txid, status); }));
    }
    std::unique_ptr<Handler> handleWatchOnlyChanged(WatchOnlyChangedFn fn) override
    {
        return MakeHandler(m_wallet->NotifyWatchonlyChanged.connect(fn));
    }
    std::unique_ptr<Handler> handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) override
    {
        return MakeHandler(m_wallet->NotifyCanGetAddressesChanged.connect(fn));
    }

    std::shared_ptr<CWallet> m_wallet;
};

class WalletClientImpl : public ChainClient
{
public:
    WalletClientImpl(Chain& chain, std::vector<std::string> wallet_filenames)
        : m_chain(chain), m_wallet_filenames(std::move(wallet_filenames))
    {
    }
    void registerRpcs() override { return RegisterWalletRPCCommands(m_chain, m_rpc_handlers); }
    bool verify() override { return VerifyWallets(m_chain, m_wallet_filenames); }
    bool load() override { return LoadWallets(m_chain, m_wallet_filenames); }
    void start(CScheduler& scheduler) override { return StartWallets(scheduler); }
    void flush() override { return FlushWallets(); }
    void stop() override { return StopWallets(); }
    ~WalletClientImpl() override { UnloadWallets(); }

    Chain& m_chain;
    std::vector<std::string> m_wallet_filenames;
    std::vector<std::unique_ptr<Handler>> m_rpc_handlers;
};

} // namespace

std::unique_ptr<Wallet> MakeWallet(const std::shared_ptr<CWallet>& wallet) { return wallet ? MakeUnique<WalletImpl>(wallet) : nullptr; }

std::unique_ptr<ChainClient> MakeWalletClient(Chain& chain, std::vector<std::string> wallet_filenames)
{
    return MakeUnique<WalletClientImpl>(chain, std::move(wallet_filenames));
}

} // namespace interfaces