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/**
* @file
* @copyright defined in eos/LICENSE.txt
*/
#include <eosio.token.hpp>
namespace eosio {
void token::create( account_name issuer,
asset maximum_supply )
{
require_auth( _self );
auto sym = maximum_supply.symbol;
eosio_assert( sym.is_valid(), "invalid symbol name" );
eosio_assert( maximum_supply.is_valid(), "invalid supply");
eosio_assert( maximum_supply.amount > 0, "max-supply must be positive");
stats statstable( _self, sym.name() );
auto existing = statstable.find( sym.name() );
eosio_assert( existing == statstable.end(), "token with symbol already exists" );
statstable.emplace( _self, [&]( auto& s ) {
s.supply.symbol = maximum_supply.symbol;
s.max_supply = maximum_supply;
s.issuer = issuer;
});
}
void token::issue( account_name to, asset quantity, string memo )
{
auto sym = quantity.symbol;
eosio_assert( sym.is_valid(), "invalid symbol name" );
eosio_assert( memo.size() <= 256, "memo has more than 256 bytes" );
auto sym_name = sym.name();
stats statstable( _self, sym_name );
auto existing = statstable.find( sym_name );
eosio_assert( existing != statstable.end(), "token with symbol does not exist, create token before issue" );
const auto& st = *existing;
require_auth( st.issuer );
eosio_assert( quantity.is_valid(), "invalid quantity" );
eosio_assert( quantity.amount > 0, "must issue positive quantity" );
eosio_assert( quantity.symbol == st.supply.symbol, "symbol precision mismatch" );
eosio_assert( quantity.amount <= st.max_supply.amount - st.supply.amount, "quantity exceeds available supply");
statstable.modify( st, 0, [&]( auto& s ) {
s.supply += quantity;
});
add_balance( st.issuer, quantity, st.issuer );
if( to != st.issuer ) {
SEND_INLINE_ACTION( *this, transfer, {st.issuer,N(active)}, {st.issuer, to, quantity, memo} );
}
}
void token::transfer( account_name from,
account_name to,
asset quantity,
string memo )
{
eosio_assert( from != to, "cannot transfer to self" );
require_auth( from );
eosio_assert( is_account( to ), "to account does not exist");
auto sym = quantity.symbol.name();
stats statstable( _self, sym );
const auto& st = statstable.get( sym );
require_recipient( from );
require_recipient( to );
eosio_assert( quantity.is_valid(), "invalid quantity" );
eosio_assert( quantity.amount > 0, "must transfer positive quantity" );
eosio_assert( quantity.symbol == st.supply.symbol, "symbol precision mismatch" );
eosio_assert( memo.size() <= 256, "memo has more than 256 bytes" );
sub_balance( from, quantity );
add_balance( to, quantity, from );
}
void token::sub_balance( account_name owner, asset value ) {
accounts from_acnts( _self, owner );
const auto& from = from_acnts.get( value.symbol.name(), "no balance object found" );
eosio_assert( from.balance.amount >= value.amount, "overdrawn balance" );
if( from.balance.amount == value.amount ) {
from_acnts.erase( from );
} else {
from_acnts.modify( from, owner, [&]( auto& a ) {
a.balance -= value;
});
}
}
void token::add_balance( account_name owner, asset value, account_name ram_payer )
{
accounts to_acnts( _self, owner );
auto to = to_acnts.find( value.symbol.name() );
if( to == to_acnts.end() ) {
to_acnts.emplace( ram_payer, [&]( auto& a ){
a.balance = value;
});
} else {
to_acnts.modify( to, 0, [&]( auto& a ) {
a.balance += value;
});
}
}
} /// namespace eosio
EOSIO_ABI( eosio::token, (create)(issue)(transfer) )
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