/* * Copyright (c) 2015 Cryptonomex, Inc., and contributors. * * The MIT License * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #pragma once #include #include #include #include /** * @defgroup prediction_market Prediction Market * * A prediction market is a specialized BitAsset such that total debt and total collateral are always equal amounts * (although asset IDs differ). No margin calls or force settlements may be performed on a prediction market asset. A * prediction market is globally settled by the issuer after the event being predicted resolves, thus a prediction * market must always have the @ref global_settle permission enabled. The maximum price for global settlement or short * sale of a prediction market asset is 1-to-1. */ namespace graphene { namespace chain { class account_object; class database; using namespace graphene::db; /** * @brief tracks the asset information that changes frequently * @ingroup object * @ingroup implementation * * Because the asset_object is very large it doesn't make sense to save an undo state * for all of the parameters that never change. This object factors out the parameters * of an asset that change in almost every transaction that involves the asset. * * This object exists as an implementation detail and its ID should never be referenced by * a blockchain operation. */ class asset_dynamic_data_object : public abstract_object { public: static const uint8_t space_id = implementation_ids; static const uint8_t type_id = impl_asset_dynamic_data_type; /// The number of shares currently in existence share_type current_supply; share_type confidential_supply; ///< total asset held in confidential balances share_type accumulated_fees; ///< fees accumulate to be paid out over time share_type fee_pool; ///< in core asset }; /** * @brief tracks the parameters of an asset * @ingroup object * * All assets have a globally unique symbol name that controls how they are traded and an issuer who * has authority over the parameters of the asset. */ class asset_object : public graphene::db::abstract_object { public: static const uint8_t space_id = protocol_ids; static const uint8_t type_id = asset_object_type; /// This function does not check if any registered asset has this symbol or not; it simply checks whether the /// symbol would be valid. /// @return true if symbol is a valid ticker symbol; false otherwise. static bool is_valid_symbol( const string& symbol ); /// @return true if this is a market-issued asset; false otherwise. bool is_market_issued()const { return bitasset_data_id.valid(); } /// @return true if users may request force-settlement of this market-issued asset; false otherwise bool can_force_settle()const { return !(options.flags & disable_force_settle); } /// @return true if the issuer of this market-issued asset may globally settle the asset; false otherwise bool can_global_settle()const { return options.issuer_permissions & global_settle; } /// @return true if this asset charges a fee for the issuer on market operations; false otherwise bool charges_market_fees()const { return options.flags & charge_market_fee; } /// @return true if this asset may only be transferred to/from the issuer or market orders bool is_transfer_restricted()const { return options.flags & transfer_restricted; } bool can_override()const { return options.flags & override_authority; } bool allow_confidential()const { return !(options.flags & asset_issuer_permission_flags::disable_confidential); } /// Helper function to get an asset object with the given amount in this asset's type asset amount(share_type a)const { return asset(a, id); } /// Convert a string amount (i.e. "123.45") to an asset object with this asset's type /// The string may have a decimal and/or a negative sign. asset amount_from_string(string amount_string)const; /// Convert an asset to a textual representation, i.e. "123.45" string amount_to_string(share_type amount)const; /// Convert an asset to a textual representation, i.e. "123.45" string amount_to_string(const asset& amount)const { FC_ASSERT(amount.asset_id == id); return amount_to_string(amount.amount); } /// Convert an asset to a textual representation with symbol, i.e. "123.45 USD" string amount_to_pretty_string(share_type amount)const { return amount_to_string(amount) + " " + symbol; } /// Convert an asset to a textual representation with symbol, i.e. "123.45 USD" string amount_to_pretty_string(const asset &amount)const { FC_ASSERT(amount.asset_id == id); return amount_to_pretty_string(amount.amount); } /// Ticker symbol for this asset, i.e. "USD" string symbol; /// Maximum number of digits after the decimal point (must be <= 12) uint8_t precision = 0; /// ID of the account which issued this asset. account_id_type issuer; asset_options options; /// Current supply, fee pool, and collected fees are stored in a separate object as they change frequently. asset_dynamic_data_id_type dynamic_asset_data_id; /// Extra data associated with BitAssets. This field is non-null if and only if is_market_issued() returns true optional bitasset_data_id; optional buyback_account; asset_id_type get_id()const { return id; } void validate()const { // UIAs may not be prediction markets, have force settlement, or global settlements if( !is_market_issued() ) { FC_ASSERT(!(options.flags & disable_force_settle || options.flags & global_settle)); FC_ASSERT(!(options.issuer_permissions & disable_force_settle || options.issuer_permissions & global_settle)); } } template const asset_bitasset_data_object& bitasset_data(const DB& db)const { assert(bitasset_data_id); return db.get(*bitasset_data_id); } template const asset_dynamic_data_object& dynamic_data(const DB& db)const { return db.get(dynamic_asset_data_id); } /** * The total amount of an asset that is reserved for future issuance. */ template share_type reserved( const DB& db )const { return options.max_supply - dynamic_data(db).current_supply; } }; /** * @brief contains properties that only apply to bitassets (market issued assets) * * @ingroup object * @ingroup implementation */ class asset_bitasset_data_object : public abstract_object { public: static const uint8_t space_id = implementation_ids; static const uint8_t type_id = impl_asset_bitasset_data_type; /// The tunable options for BitAssets are stored in this field. bitasset_options options; /// Feeds published for this asset. If issuer is not committee, the keys in this map are the feed publishing /// accounts; otherwise, the feed publishers are the currently active committee_members and witnesses and this map /// should be treated as an implementation detail. The timestamp on each feed is the time it was published. flat_map> feeds; /// This is the currently active price feed, calculated as the median of values from the currently active /// feeds. price_feed current_feed; /// This is the publication time of the oldest feed which was factored into current_feed. time_point_sec current_feed_publication_time; /// True if this asset implements a @ref prediction_market bool is_prediction_market = false; /// This is the volume of this asset which has been force-settled this maintanence interval share_type force_settled_volume; /// Calculate the maximum force settlement volume per maintenance interval, given the current share supply share_type max_force_settlement_volume(share_type current_supply)const; /** return true if there has been a black swan, false otherwise */ bool has_settlement()const { return !settlement_price.is_null(); } /** * In the event of a black swan, the swan price is saved in the settlement price, and all margin positions * are settled at the same price with the siezed collateral being moved into the settlement fund. From this * point on no further updates to the asset are permitted (no feeds, etc) and forced settlement occurs * immediately when requested, using the settlement price and fund. */ ///@{ /// Price at which force settlements of a black swanned asset will occur price settlement_price; /// Amount of collateral which is available for force settlement share_type settlement_fund; ///@} time_point_sec feed_expiration_time()const { return current_feed_publication_time + options.feed_lifetime_sec; } bool feed_is_expired_before_hardfork_615(time_point_sec current_time)const { return feed_expiration_time() >= current_time; } bool feed_is_expired(time_point_sec current_time)const { return feed_expiration_time() <= current_time; } void update_median_feeds(time_point_sec current_time); }; struct by_feed_expiration; typedef multi_index_container< asset_bitasset_data_object, indexed_by< ordered_unique< tag, member< object, object_id_type, &object::id > >, ordered_non_unique< tag, const_mem_fun< asset_bitasset_data_object, time_point_sec, &asset_bitasset_data_object::feed_expiration_time > > > > asset_bitasset_data_object_multi_index_type; typedef flat_index asset_bitasset_data_index; struct by_symbol; struct by_type; typedef multi_index_container< asset_object, indexed_by< ordered_unique< tag, member< object, object_id_type, &object::id > >, ordered_unique< tag, member >, ordered_unique< tag, composite_key< asset_object, const_mem_fun, member< object, object_id_type, &object::id > > > > > asset_object_multi_index_type; typedef generic_index asset_index; } } // graphene::chain FC_REFLECT_DERIVED( graphene::chain::asset_dynamic_data_object, (graphene::db::object), (current_supply)(confidential_supply)(accumulated_fees)(fee_pool) ) FC_REFLECT_DERIVED( graphene::chain::asset_bitasset_data_object, (graphene::db::object), (feeds) (current_feed) (current_feed_publication_time) (options) (force_settled_volume) (is_prediction_market) (settlement_price) (settlement_fund) ) FC_REFLECT_DERIVED( graphene::chain::asset_object, (graphene::db::object), (symbol) (precision) (issuer) (options) (dynamic_asset_data_id) (bitasset_data_id) (buyback_account) )