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150 lines
3.8 KiB
C++
150 lines
3.8 KiB
C++
#include <xrpl/protocol/Rules.h>
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// Do not remove. Forces Rules.h to stay first, to verify it can compile
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// without any hidden dependencies
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#include <xrpl/basics/LocalValue.h>
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#include <xrpl/basics/Number.h>
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#include <xrpl/basics/base_uint.h>
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#include <xrpl/basics/hardened_hash.h>
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#include <xrpl/beast/hash/uhash.h>
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#include <xrpl/beast/utility/instrumentation.h>
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#include <xrpl/protocol/Feature.h>
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#include <xrpl/protocol/STVector256.h>
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#include <memory>
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#include <optional>
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#include <unordered_set>
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#include <utility>
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namespace xrpl {
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namespace {
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// Use a static inside a function to help prevent order-of-initialization issues
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LocalValue<std::optional<Rules>>&
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getCurrentTransactionRulesRef()
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{
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static LocalValue<std::optional<Rules>> r;
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return r;
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}
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} // namespace
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std::optional<Rules> const&
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getCurrentTransactionRules()
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{
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return *getCurrentTransactionRulesRef();
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}
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void
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setCurrentTransactionRules(std::optional<Rules> r)
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{
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// Make global changes associated with the rules before the value is moved.
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// Push the appropriate setting, instead of having the class pull every time
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// the value is needed. That could get expensive fast.
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bool enableLargeNumbers =
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!r || (r->enabled(featureSingleAssetVault) || r->enabled(featureLendingProtocol));
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Number::setMantissaScale(enableLargeNumbers ? MantissaRange::large : MantissaRange::small);
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*getCurrentTransactionRulesRef() = std::move(r);
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}
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class Rules::Impl
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{
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private:
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std::unordered_set<uint256, hardened_hash<>> set_;
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std::optional<uint256> digest_;
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std::unordered_set<uint256, beast::uhash<>> const& presets_;
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public:
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explicit Impl(std::unordered_set<uint256, beast::uhash<>> const& presets) : presets_(presets)
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{
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}
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Impl(
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std::unordered_set<uint256, beast::uhash<>> const& presets,
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std::optional<uint256> const& digest,
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STVector256 const& amendments)
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: digest_(digest), presets_(presets)
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{
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set_.reserve(amendments.size());
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set_.insert(amendments.begin(), amendments.end());
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}
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std::unordered_set<uint256, beast::uhash<>> const&
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presets() const
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{
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return presets_;
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}
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bool
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enabled(uint256 const& feature) const
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{
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if (presets_.count(feature) > 0)
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return true;
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return set_.count(feature) > 0;
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}
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bool
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operator==(Impl const& other) const
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{
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if (!digest_ && !other.digest_)
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return true;
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if (!digest_ || !other.digest_)
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return false;
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XRPL_ASSERT(
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presets_ == other.presets_,
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"xrpl::Rules::Impl::operator==(Impl) const : input presets do "
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"match");
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return *digest_ == *other.digest_;
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}
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};
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Rules::Rules(std::unordered_set<uint256, beast::uhash<>> const& presets)
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: impl_(std::make_shared<Impl>(presets))
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{
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}
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Rules::Rules(
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std::unordered_set<uint256, beast::uhash<>> const& presets,
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std::optional<uint256> const& digest,
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STVector256 const& amendments)
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: impl_(std::make_shared<Impl>(presets, digest, amendments))
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{
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}
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std::unordered_set<uint256, beast::uhash<>> const&
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Rules::presets() const
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{
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return impl_->presets();
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}
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bool
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Rules::enabled(uint256 const& feature) const
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{
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XRPL_ASSERT(impl_, "xrpl::Rules::enabled : initialized");
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return impl_->enabled(feature);
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}
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bool
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Rules::operator==(Rules const& other) const
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{
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XRPL_ASSERT(impl_ && other.impl_, "xrpl::Rules::operator==(Rules) const : both initialized");
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if (impl_.get() == other.impl_.get())
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return true;
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return *impl_ == *other.impl_;
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}
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bool
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Rules::operator!=(Rules const& other) const
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{
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return !(*this == other);
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}
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bool
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isFeatureEnabled(uint256 const& feature)
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{
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auto const& rules = getCurrentTransactionRules();
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return rules && rules->enabled(feature);
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}
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} // namespace xrpl
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