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 deposit( const account_name from, const asset& quantity )
{
eosio_assert( quantity.is_valid(), "invalid quantiy" );
eosio_assert( quantity.amount > 0, "must deposit positive quantity" );
action
(
permission_level
{
from, N( active )
},
N( eosio.token ),
N( transfer ),
std::make_tuple( from, _self, quantity, std::string("") )
).send();
return;
}
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;
});
}
//@abi action
void deposit( const account_name from, const asset& quantity ) {
eosio_assert( quantity.is_valid(), "invalid quantity" );
eosio_assert( quantity.amount > 0, "must deposit positive quantity" );
auto itr = accounts.find(from);
if( itr == accounts.end() ) {
itr = accounts.emplace(_self, [&](auto& acnt){
acnt.owner = from;
});
}
action(
permission_level{ from, N(active) },
N(eosio.token), N(transfer),
std::make_tuple(from, _self, quantity, std::string(""))
).send();
accounts.modify( itr, 0, [&]( auto& acnt ) {
acnt.eos_balance += quantity;
});
}
//@abi action
void withdraw( const account_name to, const asset& quantity ) {
require_auth( to );
eosio_assert( quantity.is_valid(), "invalid quantity" );
eosio_assert( quantity.amount > 0, "must withdraw positive quantity" );
auto itr = accounts.find( to );
eosio_assert(itr != accounts.end(), "unknown account");
accounts.modify( itr, 0, [&]( auto& acnt ) {
eosio_assert( acnt.eos_balance >= quantity, "insufficient balance" );
acnt.eos_balance -= quantity;
});
action(
permission_level{ _self, N(active) },
N(eosio.token), N(transfer),
std::make_tuple(_self, to, quantity, std::string(""))
).send();
if( itr->is_empty() ) {
accounts.erase(itr);
}
}
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 );
}
