brain storm line of credit operations
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Daniel Larimer
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1 changed files with 146 additions and 0 deletions
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libraries/chain/include/graphene/chain/line_of_credit.hpp
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libraries/chain/include/graphene/chain/line_of_credit.hpp
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#pragma once
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namespace graphene { namespace chain {
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struct line_of_credit
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{
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enum flag
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{
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/**
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* Debt may be increased via credit_passthrough operation, controlled by borrower
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**/
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bool allow_lender_passthrough = 0x01,
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bool allow_borrower_passthrough = 0x02,
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/** borrower may pull BitUSD from lender */
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bool allow_cash_advance = 0x04,
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/** the lender may change the interest rate */
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bool allow_variable_interest = 0x08
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};
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account_id_type borrower;
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account_id_type lender;
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share_type debt;
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share_type credit_limit;
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share_type passthrough_fee;
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asset_id_type asset_type;
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/** accumulated daily, compounded every update */
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uint16_t interest_apr = 0;
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uint8_t flags = 0;
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/** requires borrower and lender to approve update */
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digest_type loan_contract_digest;
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};
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/**
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* Index on borrower/asset_type and lender/asset_type
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*/
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class line_of_credit_object : public db::abstract_object<line_of_credit_object>
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{
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static const uint8_t space_id = protocol_ids;
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static const uint8_t type_id = line_of_credit_object_type;
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account_id_type borrower()const { return terms.borrower; }
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account_id_type lender()const { return terms.lender; }
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asset debt()const { return asset( terms.debt, terms.asset_type ); }
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asset credit_limit()const { return asset( terms.credit_limit, terms.asset_type ); }
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asset_id_type asset_type()const { return term.asset_type; }
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line_of_credit terms;
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time_point_sec last_update;
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/**
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* Both borrower and lender must approve of the line of credit before any
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* debts may accrue.
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*/
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bool borrower_approved = false;
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bool borrower_lender_approved = false;
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};
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struct by_borrower;
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struct by_lender;
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/**
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* @ingroup object_index
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*/
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typedef multi_index_container<
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line_of_credit_object,
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indexed_by<
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ordered_unique< tag<by_id>, member< object, object_id_type, &object::id > >,
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ordered_non_unique< tag<by_borrower>, composite_key<
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line_of_credit_object,
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const_member_fun<line_of_credit_object, account_id_type, &line_of_credit_object::borrower>,
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const_member_fun<line_of_credit_object, asset_id_type, &line_of_credit_object::asset_type> >
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>,
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ordered_non_unique< tag<by_lender>, composite_key<
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line_of_credit_object,
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const_member_fun<line_of_credit_object, account_id_type, &line_of_credit_object::lender>,
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const_member_fun<line_of_credit_object, asset_id_type, &line_of_credit_object::asset_type> >
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>
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>
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> line_of_credit_object_multi_index_type;
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typedef generic_index<line_of_credit_object, line_of_credit_object_multi_index_type> line_of_credit_index;
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struct line_of_credit_create_operation
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{
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asset fee;
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account_id_type creator; ///< pays the transaction fee and approves terms by default
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line_of_credit terms;
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};
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struct line_of_credit_accept_terms_operation
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{
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asset fee;
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line_of_credit_id_type id;
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account_id_type acceptor;
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};
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struct line_of_credit_update_operation
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{
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asset fee; ///< paid for by terms.lender
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account_id_type updater; ///< account performing the update
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line_of_credit_id_type id;
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/**
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* Lender may increase or lower, borrower may increase
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*/
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uint16_t new_interest_rate = 0;
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uint8_t flags;
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/**
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* Lender may increase or lower, borrower may lower
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*/
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asset new_credit_limit;
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};
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/**
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* This operation is used to transfer the debt to a debt
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* collector.
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*/
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struct line_of_credit_transfer_debt_operation
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{
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asset fee; ///< paid for by current_lender
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line_of_credit_id_type loc;
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account_id_type current_lender;
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account_id_type new_lender;
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};
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/**
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* @brief enables payment of 3rd parties by rebalancing debts among users
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*/
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struct line_of_credit_passthrough_operation
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{
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struct transfer_node
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{
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line_of_credit_id_type loc;
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account_id_type borrower;
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account_id_type lender;
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share_type delta_debt;
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share_type fee_paid; ///< always paid to the lender
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};
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asset fee;
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account_id_type fee_payer; ///< accout with actual asset to pay fee
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account_id_type from; ///< account funding the init_amount
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asset init_amount;
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vector<transfer_node> passthrough; ///< pass through nodes
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};
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} } // graphene / chain
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