C++ pointer::storeChange方法代码示例

static void
createTestAccounts(Application& app, int nbAccounts,
                   std::function<int64(int)> getBalance,
                   std::function<int(int)> getVote)
{
    // set up world
    SecretKey root = getRoot(app.getNetworkID());

    SequenceNumber rootSeq = getAccountSeqNum(root, app) + 1;

    auto& lm = app.getLedgerManager();
    auto& db = app.getDatabase();

    int64 setupBalance = lm.getMinBalance(0);

    LedgerDelta delta(lm.getCurrentLedgerHeader(), app.getDatabase());
    for (int i = 0; i < nbAccounts; i++)
    {
        int64 bal = getBalance(i);
        if (bal >= 0)
        {
            SecretKey to = getTestAccount(i);
            applyCreateAccountTx(app, root, to, rootSeq++, setupBalance);

            AccountFrame::pointer act;
            act = loadAccount(to, app);
            act->getAccount().balance = bal;
            act->getAccount().inflationDest.activate() =
                getTestAccount(getVote(i)).getPublicKey();
            act->storeChange(delta, db);
        }
    }
}

// make sure the deleted Account hasn't issued credit
// make sure we aren't holding any credit
// make sure the we delete all the offers
// make sure the we delete all the trustlines
// move the XLM to the new account
bool
MergeOpFrame::doApply(LedgerDelta& delta, LedgerManager& ledgerManager)
{
    AccountFrame::pointer otherAccount;
    Database& db = ledgerManager.getDatabase();

    otherAccount = AccountFrame::loadAccount(mOperation.body.destination(), db);

    if (!otherAccount)
    {
        innerResult().code(ACCOUNT_MERGE_NO_ACCOUNT);
        return false;
    }

    if (TrustFrame::hasIssued(getSourceID(), db))
    {
        innerResult().code(ACCOUNT_MERGE_CREDIT_HELD);
        return false;
    }

    std::vector<TrustFrame::pointer> lines;
    TrustFrame::loadLines(getSourceID(), lines, db);
    for(auto &l : lines)
    {
        if(l->getBalance() > 0)
        {
            innerResult().code(ACCOUNT_MERGE_HAS_CREDIT);
            return false;
        }
    }

    // delete offers
    std::vector<OfferFrame::pointer> offers;
    OfferFrame::loadOffers(getSourceID(), offers, db);
    for (auto& offer : offers)
    {
        offer->storeDelete(delta, db);
    }

    // delete trust lines
    for (auto& l : lines)
    {
        l->storeDelete(delta, db);
    }

    otherAccount->getAccount().balance += mSourceAccount->getAccount().balance;
    otherAccount->storeChange(delta, db);
    mSourceAccount->storeDelete(delta, db);

    innerResult().code(ACCOUNT_MERGE_SUCCESS);
    return true;
}

bool
InflationOpFrame::doApply(medida::MetricsRegistry& metrics, LedgerDelta& delta,
                          LedgerManager& ledgerManager)
{
    LedgerDelta inflationDelta(delta);

    auto& lcl = inflationDelta.getHeader();

    time_t closeTime = lcl.scpValue.closeTime;
    uint32_t seq = lcl.inflationSeq;

    time_t inflationTime = (INFLATION_START_TIME + seq * INFLATION_FREQUENCY);
    if (closeTime < inflationTime)
    {
        metrics.NewMeter({"op-inflation", "failure", "not-time"}, "operation")
            .Mark();
        innerResult().code(INFLATION_NOT_TIME);
        return false;
    }

    /*
    Inflation is calculated using the following

    1. calculate tally of votes based on "inflationDest" set on each account
    2. take the top accounts (by vote) that get at least .05% of the vote
    3. If no accounts are over this threshold then the extra goes back to the 
       inflation pool
    */

    int64_t totalVotes = lcl.totalCoins;
    int64_t minBalance =
        bigDivide(totalVotes, INFLATION_WIN_MIN_PERCENT, TRILLION);

    std::vector<AccountFrame::InflationVotes> winners;
    auto& db = ledgerManager.getDatabase();

    AccountFrame::processForInflation(
        [&](AccountFrame::InflationVotes const& votes)
        {
            if (votes.mVotes >= minBalance)
            {
                winners.push_back(votes);
                return true;
            }
            return false;
        },
        INFLATION_NUM_WINNERS, db);

    int64 amountToDole =
        bigDivide(lcl.totalCoins, INFLATION_RATE_TRILLIONTHS, TRILLION);
    amountToDole += lcl.feePool;

    lcl.feePool = 0;
    lcl.inflationSeq++;

    // now credit each account
    innerResult().code(INFLATION_SUCCESS);
    auto& payouts = innerResult().payouts();

    int64 leftAfterDole = amountToDole;

   
    for (auto const& w : winners)
    {
        AccountFrame::pointer winner;

        int64 toDoleThisWinner =
            bigDivide(amountToDole, w.mVotes, totalVotes);

        if (toDoleThisWinner == 0)
            continue;

        winner = AccountFrame::loadAccount(w.mInflationDest, db);

        if (winner)
        {
            leftAfterDole -= toDoleThisWinner;
            lcl.totalCoins += toDoleThisWinner;
            winner->getAccount().balance += toDoleThisWinner;
            winner->storeChange(inflationDelta, db);
            payouts.emplace_back(w.mInflationDest, toDoleThisWinner);
        }
    }
   
    // put back in fee pool as unclaimed funds
    lcl.feePool += leftAfterDole;
    

    inflationDelta.commit();

    metrics.NewMeter({"op-inflation", "success", "apply"}, "operation").Mark();
    return true;
}

bool
InflationOpFrame::doApply(medida::MetricsRegistry& metrics, LedgerDelta& delta,
                          LedgerManager& ledgerManager)
{
    LedgerDelta inflationDelta(delta);

    auto& lcl = inflationDelta.getHeader();

    time_t closeTime = lcl.scpValue.closeTime;
    uint32_t seq = lcl.inflationSeq;

    time_t inflationTime = (INFLATION_START_TIME + seq * INFLATION_FREQUENCY);
    if (closeTime < inflationTime)
    {
        metrics.NewMeter({"op-inflation", "failure", "not-time"}, "operation")
            .Mark();
        innerResult().code(INFLATION_NOT_TIME);
        return false;
    }

    /*
    Inflation is calculated using the following

    1. calculate tally of votes based on "inflationDest" set on each account
    2. take the top accounts (by vote) that exceed 1.5%
        (INFLATION_WIN_MIN_PERCENT) of votes,
        up to 50 accounts (INFLATION_NUM_WINNERS)
    exception:
    if no account crosses the INFLATION_WIN_MIN_PERCENT, the top 50 is used
    3. share the coins between those accounts proportionally to the number
        of votes they got.
    */

    int64_t totalVotes = 0;
    bool first = true;
    int64_t minBalance =
        bigDivide(lcl.totalCoins, INFLATION_WIN_MIN_PERCENT, TRILLION);

    std::vector<AccountFrame::InflationVotes> winners;
    auto& db = ledgerManager.getDatabase();

    AccountFrame::processForInflation(
        [&](AccountFrame::InflationVotes const& votes)
        {
            if (first && votes.mVotes < minBalance)
            {
                // need to take the entire set if nobody crossed the threshold
                minBalance = 0;
            }

            first = false;

            bool res;

            if (votes.mVotes >= minBalance)
            {
                totalVotes += votes.mVotes;
                winners.push_back(votes);
                res = true;
            }
            else
            {
                res = false;
            }

            return res;
        },
        INFLATION_NUM_WINNERS, db);

    int64 amountToDole =
        bigDivide(lcl.totalCoins, INFLATION_RATE_TRILLIONTHS, TRILLION);
    amountToDole += lcl.feePool;

    lcl.feePool = 0;
    lcl.inflationSeq++;

    // now credit each account
    innerResult().code(INFLATION_SUCCESS);
    auto& payouts = innerResult().payouts();

    if (totalVotes != 0)
    {
        for (auto const& w : winners)
        {
            AccountFrame::pointer winner;

            int64 toDoleThisWinner =
                bigDivide(amountToDole, w.mVotes, totalVotes);

            if (toDoleThisWinner == 0)
                continue;

            winner = AccountFrame::loadAccount(w.mInflationDest, db);

            if (winner)
            {
                lcl.totalCoins += toDoleThisWinner;
                winner->getAccount().balance += toDoleThisWinner;
                winner->storeChange(inflationDelta, db);
                payouts.emplace_back(w.mInflationDest, toDoleThisWinner);
//.........这里部分代码省略.........

bool
PathPaymentOpFrame::doApply(medida::MetricsRegistry& metrics,
                            LedgerDelta& delta, LedgerManager& ledgerManager)
{
    Database& db = ledgerManager.getDatabase();

    innerResult().code(PATH_PAYMENT_SUCCESS);

    // tracks the last amount that was traded
    int64_t curBReceived = mPathPayment.destAmount;
    Asset curB = mPathPayment.destAsset;

    // update balances, walks backwards

    // build the full path to the destination, starting with sendAsset
    std::vector<Asset> fullPath;
    fullPath.emplace_back(mPathPayment.sendAsset);
    fullPath.insert(fullPath.end(), mPathPayment.path.begin(),
                    mPathPayment.path.end());

    bool bypassIssuerCheck = false;

    // if the payment doesn't involve intermediate accounts
    // and the destination is the issuer we don't bother
    // checking if the destination account even exist
    // so that it's always possible to send credits back to its issuer
    bypassIssuerCheck = (curB.type() != ASSET_TYPE_NATIVE) &&
                        (fullPath.size() == 1) &&
                        (mPathPayment.sendAsset == mPathPayment.destAsset) &&
                        (getIssuer(curB) == mPathPayment.destination);

    AccountFrame::pointer destination;

    if (!bypassIssuerCheck)
    {
        destination = AccountFrame::loadAccount(mPathPayment.destination, db);

        if (!destination)
        {
            metrics.NewMeter({"op-path-payment", "failure", "no-destination"},
                             "operation").Mark();
            innerResult().code(PATH_PAYMENT_NO_DESTINATION);
            return false;
        }
    }

    // update last balance in the chain
    if (curB.type() == ASSET_TYPE_NATIVE)
    {
        destination->getAccount().balance += curBReceived;
        destination->storeChange(delta, db);
    }
    else
    {
        TrustFrame::pointer destLine;

        if (bypassIssuerCheck)
        {
            destLine =
                TrustFrame::loadTrustLine(mPathPayment.destination, curB, db);
        }
        else
        {
            auto tlI = TrustFrame::loadTrustLineIssuer(mPathPayment.destination,
                                                       curB, db);
            if (!tlI.second)
            {
                metrics.NewMeter({"op-path-payment", "failure", "no-issuer"},
                                 "operation").Mark();
                innerResult().code(PATH_PAYMENT_NO_ISSUER);
                innerResult().noIssuer() = curB;
                return false;
            }
            destLine = tlI.first;
        }

        if (!destLine)
        {
            metrics.NewMeter({"op-path-payment", "failure", "no-trust"},
                             "operation").Mark();
            innerResult().code(PATH_PAYMENT_NO_TRUST);
            return false;
        }

        if (!destLine->isAuthorized())
        {
            metrics.NewMeter({"op-path-payment", "failure", "not-authorized"},
                             "operation").Mark();
            innerResult().code(PATH_PAYMENT_NOT_AUTHORIZED);
            return false;
        }

        if (!destLine->addBalance(curBReceived))
        {
            metrics.NewMeter({"op-path-payment", "failure", "line-full"},
                             "operation").Mark();
            innerResult().code(PATH_PAYMENT_LINE_FULL);
            return false;
        }

//.........这里部分代码省略.........

//.........这里部分代码省略.........
        // actual update
        // is done further down
        sellingWheatOffer.getOffer().amount = numWheatReceived;
    }

    bool reducedOffer = false;

    if (numWheatReceived > maxWheatReceived)
    {
        numWheatReceived = maxWheatReceived;
        reducedOffer = true;
    }

    // this guy can get X wheat to you. How many sheep does that get him?
    if (!bigDivide(numSheepSend, numWheatReceived,
                   sellingWheatOffer.getOffer().price.n,
                   sellingWheatOffer.getOffer().price.d))
    {
        numSheepSend = INT64_MAX;
    }

    if (numSheepSend > maxSheepSend)
    {
        // reduce the number even more if there is a limit on Sheep
        numSheepSend = maxSheepSend;
        reducedOffer = true;
    }

    // bias towards seller (this cannot overflow at this point)
    numWheatReceived =
        bigDivide(numSheepSend, sellingWheatOffer.getOffer().price.d,
                  sellingWheatOffer.getOffer().price.n);

    bool offerTaken = false;

    if (numWheatReceived == 0 || numSheepSend == 0)
    {
        if (reducedOffer)
        {
            return eOfferCantConvert;
        }
        else
        {
            // force delete the offer as it represents a bogus offer
            numWheatReceived = 0;
            numSheepSend = 0;
            offerTaken = true;
        }
    }

    offerTaken =
        offerTaken || sellingWheatOffer.getOffer().amount <= numWheatReceived;
    if (offerTaken)
    {   // entire offer is taken
        sellingWheatOffer.storeDelete(mDelta, db);

        accountB->addNumEntries(-1, mLedgerManager);
        accountB->storeChange(mDelta, db);
    }
    else
    {
        sellingWheatOffer.getOffer().amount -= numWheatReceived;
        sellingWheatOffer.storeChange(mDelta, db);
    }

    // Adjust balances
    if (sheep.type() == ASSET_TYPE_NATIVE)
    {
        accountB->getAccount().balance += numSheepSend;
        accountB->storeChange(mDelta, db);
    }
    else
    {
        if (!sheepLineAccountB->addBalance(numSheepSend))
        {
            return eOfferCantConvert;
        }
        sheepLineAccountB->storeChange(mDelta, db);
    }

    if (wheat.type() == ASSET_TYPE_NATIVE)
    {
        accountB->getAccount().balance -= numWheatReceived;
        accountB->storeChange(mDelta, db);
    }
    else
    {
        if (!wheatLineAccountB->addBalance(-numWheatReceived))
        {
            return eOfferCantConvert;
        }
        wheatLineAccountB->storeChange(mDelta, db);
    }

    mOfferTrail.push_back(
        ClaimOfferAtom(accountB->getID(), sellingWheatOffer.getOfferID(), wheat,
                       numWheatReceived, sheep, numSheepSend));

    return offerTaken ? eOfferTaken : eOfferPartial;
}

bool
PathPaymentOpFrame::doApply(medida::MetricsRegistry& metrics,
                            LedgerDelta& delta, LedgerManager& ledgerManager)
{
    AccountFrame::pointer destination;

    Database& db = ledgerManager.getDatabase();

    destination = AccountFrame::loadAccount(mPathPayment.destination, db);

    if (!destination)
    {
        metrics.NewMeter({"op-path-payment", "failure", "no-destination"},
                         "operation").Mark();
        innerResult().code(PATH_PAYMENT_NO_DESTINATION);
        return false;
    }

    innerResult().code(PATH_PAYMENT_SUCCESS);

    // tracks the last amount that was traded
    int64_t curBReceived = mPathPayment.destAmount;
    Asset curB = mPathPayment.destAsset;

    // update balances, walks backwards

    // build the full path to the destination, starting with sendAsset
    std::vector<Asset> fullPath;
    fullPath.emplace_back(mPathPayment.sendAsset);
    fullPath.insert(fullPath.end(), mPathPayment.path.begin(),
                    mPathPayment.path.end());

    // update last balance in the chain
    {
        if (curB.type() == ASSET_TYPE_NATIVE)
        {
            destination->getAccount().balance += curBReceived;
            destination->storeChange(delta, db);
        }
        else
        {
            TrustFrame::pointer destLine;

            destLine =
                TrustFrame::loadTrustLine(destination->getID(), curB, db);
            if (!destLine)
            {
                metrics.NewMeter({"op-path-payment", "failure", "no-trust"},
                                 "operation").Mark();
                innerResult().code(PATH_PAYMENT_NO_TRUST);
                return false;
            }

            if (!destLine->isAuthorized())
            {
                metrics.NewMeter(
                            {"op-path-payment", "failure", "not-authorized"},
                            "operation").Mark();
                innerResult().code(PATH_PAYMENT_NOT_AUTHORIZED);
                return false;
            }

            if (!destLine->addBalance(curBReceived))
            {
                metrics.NewMeter({"op-path-payment", "failure", "line-full"},
                                 "operation").Mark();
                innerResult().code(PATH_PAYMENT_LINE_FULL);
                return false;
            }

            destLine->storeChange(delta, db);
        }

        innerResult().success().last =
            SimplePaymentResult(destination->getID(), curB, curBReceived);
    }

    // now, walk the path backwards
    for (int i = (int)fullPath.size() - 1; i >= 0; i--)
    {
        int64_t curASent, actualCurBReceived;
        Asset const& curA = fullPath[i];

        if (curA == curB)
        {
            continue;
        }

        OfferExchange oe(delta, ledgerManager);

        // curA -> curB
        OfferExchange::ConvertResult r =
            oe.convertWithOffers(curA, INT64_MAX, curASent, curB, curBReceived,
                                 actualCurBReceived, nullptr);
        switch (r)
        {
        case OfferExchange::eFilterStop:
            assert(false); // no filter -> should not happen
            break;
        case OfferExchange::eOK:
//.........这里部分代码省略.........