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The first few transactions are added to the open ledger at the base fee (ie. 10 drops). Once enough transactions are added, the required fee will jump dramatically. If additional transactions are added, the fee will grow exponentially. Transactions that don't have a high enough fee to be applied to the ledger are added to the queue in order from highest fee to lowest. Whenever a new ledger is accepted as validated, transactions are first applied from the queue to the open ledger in fee order until either all transactions are applied or the fee again jumps too high for the remaining transactions. Current implementation is restricted to one transaction in the queue per account. Some groundwork has been laid to expand in the future. Note that this fee logic escalates independently of the load-based fee logic (ie. LoadFeeTrack). Submitted transactions must meet the load fee to be considered for the queue, and must meet both fees to be put into open ledger.
287 lines
8.3 KiB
C++
287 lines
8.3 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_APP_LEDGER_OPENLEDGER_H_INCLUDED
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#define RIPPLE_APP_LEDGER_OPENLEDGER_H_INCLUDED
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#include <ripple/app/ledger/Ledger.h>
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#include <ripple/ledger/CachedSLEs.h>
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#include <ripple/ledger/OpenView.h>
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#include <ripple/app/misc/CanonicalTXSet.h>
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#include <ripple/basics/Log.h>
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#include <ripple/basics/UnorderedContainers.h>
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#include <ripple/core/Config.h>
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#include <beast/utility/Journal.h>
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#include <cassert>
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#include <mutex>
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namespace ripple {
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// How many total extra passes we make
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// We must ensure we make at least one non-retriable pass
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#define LEDGER_TOTAL_PASSES 3
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// How many extra retry passes we
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// make if the previous retry pass made changes
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#define LEDGER_RETRY_PASSES 1
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using OrderedTxs = CanonicalTXSet;
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//------------------------------------------------------------------------------
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/** Represents the open ledger. */
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class OpenLedger
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{
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private:
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beast::Journal j_;
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CachedSLEs& cache_;
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std::mutex mutable modify_mutex_;
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std::mutex mutable current_mutex_;
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std::shared_ptr<OpenView const> current_;
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public:
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/** Signature for modification functions.
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The modification function is called during
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apply and modify with an OpenView to accumulate
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changes and the Journal to use for logging.
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A return value of `true` informs OpenLedger
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that changes were made. Always returning
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`true` won't cause harm, but it may be
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sub-optimal.
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*/
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using modify_type = std::function<
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bool(OpenView&, beast::Journal)>;
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OpenLedger() = delete;
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OpenLedger (OpenLedger const&) = delete;
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OpenLedger& operator= (OpenLedger const&) = delete;
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/** Create a new open ledger object.
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@param ledger A closed ledger
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*/
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explicit
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OpenLedger(std::shared_ptr<
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Ledger const> const& ledger,
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CachedSLEs& cache,
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beast::Journal journal);
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/** Returns `true` if there are no transactions.
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The behavior of ledger closing can be different
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depending on whether or not transactions exist
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in the open ledger.
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@note The value returned is only meaningful for
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that specific instant in time. An open,
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empty ledger can become non empty from
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subsequent modifications. Caller is
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responsible for synchronizing the meaning of
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the return value.
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*/
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bool
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empty() const;
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/** Returns a view to the current open ledger.
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Thread safety:
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Can be called concurrently from any thread.
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Effects:
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The caller is given ownership of a
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non-modifiable snapshot of the open ledger
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at the time of the call.
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*/
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std::shared_ptr<OpenView const>
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current() const;
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/** Modify the open ledger
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Thread safety:
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Can be called concurrently from any thread.
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If `f` returns `true`, the changes made in the
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OpenView will be published to the open ledger.
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@return `true` if the open view was changed
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*/
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bool
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modify (modify_type const& f);
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/** Accept a new ledger.
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Thread safety:
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Can be called concurrently from any thread.
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Effects:
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A new open view based on the accepted ledger
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is created, and the list of retriable
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transactions is optionally applied first
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depending on the value of `retriesFirst`.
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The transactions in the current open view
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are applied to the new open view.
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The list of local transactions are applied
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to the new open view.
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The optional modify function f is called
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to perform further modifications to the
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open view, atomically. Changes made in
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the modify function are not visible to
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callers until accept() returns.
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Any failed, retriable transactions are left
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in `retries` for the caller.
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The current view is atomically set to the
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new open view.
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@param rules The rules for the open ledger
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@param ledger A new closed ledger
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*/
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void
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accept (Application& app, Rules const& rules,
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std::shared_ptr<Ledger const> const& ledger,
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OrderedTxs const& locals, bool retriesFirst,
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OrderedTxs& retries, ApplyFlags flags,
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std::string const& suffix = "",
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modify_type const& f = {});
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/** Algorithm for applying transactions.
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This has the retry logic and ordering semantics
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used for consensus and building the open ledger.
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*/
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template <class FwdRange>
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static
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void
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apply (Application& app, OpenView& view,
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ReadView const& check, FwdRange const& txs,
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OrderedTxs& retries, ApplyFlags flags,
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beast::Journal j);
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private:
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enum Result
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{
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success,
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failure,
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retry
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};
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std::shared_ptr<OpenView>
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create (Rules const& rules,
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std::shared_ptr<Ledger const> const& ledger);
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static
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Result
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apply_one (Application& app, OpenView& view,
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std::shared_ptr< STTx const> const& tx,
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bool retry, ApplyFlags flags,
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beast::Journal j);
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};
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//------------------------------------------------------------------------------
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template <class FwdRange>
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void
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OpenLedger::apply (Application& app, OpenView& view,
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ReadView const& check, FwdRange const& txs,
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OrderedTxs& retries, ApplyFlags flags,
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beast::Journal j)
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{
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for (auto iter = txs.begin();
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iter != txs.end(); ++iter)
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{
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try
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{
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// Dereferencing the iterator can
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// throw since it may be transformed.
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auto const tx = *iter;
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if (check.txExists(tx->getTransactionID()))
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continue;
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auto const result = apply_one(app, view,
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tx, true, flags, j);
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if (result == Result::retry)
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retries.insert(tx);
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}
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catch(...)
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{
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JLOG(j.error) <<
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"Caught exception";
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}
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}
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bool retry = true;
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for (int pass = 0;
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pass < LEDGER_TOTAL_PASSES;
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++pass)
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{
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int changes = 0;
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auto iter = retries.begin();
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while (iter != retries.end())
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{
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switch (apply_one(app, view,
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iter->second, retry, flags,
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j))
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{
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case Result::success:
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++changes;
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case Result::failure:
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iter = retries.erase (iter);
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break;
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case Result::retry:
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++iter;
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}
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}
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// A non-retry pass made no changes
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if (! changes && ! retry)
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return;
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// Stop retriable passes
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if (! changes || (pass >= LEDGER_RETRY_PASSES))
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retry = false;
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}
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// If there are any transactions left, we must have
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// tried them in at least one final pass
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assert (retries.empty() || ! retry);
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}
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//------------------------------------------------------------------------------
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// For debug logging
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std::string
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debugTxstr (std::shared_ptr<STTx const> const& tx);
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std::string
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debugTostr (OrderedTxs const& set);
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std::string
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debugTostr (SHAMap const& set);
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std::string
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debugTostr (std::shared_ptr<ReadView const> const& view);
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} // ripple
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#endif
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