6b21ad9922
Everywhere including examples, external interop APIs, bindings generators
code and in other valuable places. A couple of `interface{}` usages are
intentionally left in the CHANGELOG.md, documentation and tests.
72 lines
2.5 KiB
Go
72 lines
2.5 KiB
Go
/*
|
|
Package neptoken contains RPC wrapper for common NEP-11 and NEP-17 methods.
|
|
|
|
All of these methods are safe, read-only.
|
|
*/
|
|
package neptoken
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
|
|
"github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"
|
|
"github.com/nspcc-dev/neo-go/pkg/util"
|
|
)
|
|
|
|
const (
|
|
// MaxValidDecimals is the maximum value 'decimals' contract method can
|
|
// return to be considered as valid. It's log10(2^256), higher values
|
|
// don't make any sense on a VM with 256-bit integers. This restriction
|
|
// is not imposed by NEP-17 or NEP-11, but we do it as a sanity check
|
|
// anyway (and return plain int as a result).
|
|
MaxValidDecimals = 77
|
|
)
|
|
|
|
// Invoker is used by Base to call various methods.
|
|
type Invoker interface {
|
|
Call(contract util.Uint160, operation string, params ...any) (*result.Invoke, error)
|
|
}
|
|
|
|
// Base is a reader interface for common NEP-11 and NEP-17 methods built
|
|
// on top of Invoker.
|
|
type Base struct {
|
|
invoker Invoker
|
|
hash util.Uint160
|
|
}
|
|
|
|
// New creates an instance of Base for contract with the given hash using the
|
|
// given invoker.
|
|
func New(invoker Invoker, hash util.Uint160) *Base {
|
|
return &Base{invoker, hash}
|
|
}
|
|
|
|
// Decimals implements `decimals` NEP-17 or NEP-11 method and returns the number
|
|
// of decimals used by token. For non-divisible NEP-11 tokens this method always
|
|
// returns zero. Values less than 0 or more than MaxValidDecimals are considered
|
|
// to be invalid (with an appropriate error) even if returned by the contract.
|
|
func (b *Base) Decimals() (int, error) {
|
|
r, err := b.invoker.Call(b.hash, "decimals")
|
|
dec, err := unwrap.LimitedInt64(r, err, 0, MaxValidDecimals)
|
|
return int(dec), err
|
|
}
|
|
|
|
// Symbol implements `symbol` NEP-17 or NEP-11 method and returns a short token
|
|
// identifier (like "NEO" or "GAS").
|
|
func (b *Base) Symbol() (string, error) {
|
|
return unwrap.PrintableASCIIString(b.invoker.Call(b.hash, "symbol"))
|
|
}
|
|
|
|
// TotalSupply returns the total token supply currently available (the amount
|
|
// of minted tokens).
|
|
func (b *Base) TotalSupply() (*big.Int, error) {
|
|
return unwrap.BigInt(b.invoker.Call(b.hash, "totalSupply"))
|
|
}
|
|
|
|
// BalanceOf returns the token balance of the given account. For NEP-17 that's
|
|
// the token balance with decimals (1 TOK with 2 decimals will lead to 100
|
|
// returned from this method). For non-divisible NEP-11 that's the number of
|
|
// NFTs owned by the account, for divisible NEP-11 that's the sum of the parts
|
|
// of all NFTs owned by the account.
|
|
func (b *Base) BalanceOf(account util.Uint160) (*big.Int, error) {
|
|
return unwrap.BigInt(b.invoker.Call(b.hash, "balanceOf", account))
|
|
}
|