neo-go/pkg/rpc/client/nep.go

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package client
import (
"fmt"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/wallet"
)
// nepDecimals invokes `decimals` NEP* method on the specified contract.
func (c *Client) nepDecimals(tokenHash util.Uint160) (int64, error) {
result, err := c.InvokeFunction(tokenHash, "decimals", []smartcontract.Parameter{}, nil)
if err != nil {
return 0, err
}
err = getInvocationError(result)
if err != nil {
return 0, err
}
return topIntFromStack(result.Stack)
}
// nepSymbol invokes `symbol` NEP* method on the specified contract.
func (c *Client) nepSymbol(tokenHash util.Uint160) (string, error) {
result, err := c.InvokeFunction(tokenHash, "symbol", []smartcontract.Parameter{}, nil)
if err != nil {
return "", err
}
err = getInvocationError(result)
if err != nil {
return "", err
}
return topStringFromStack(result.Stack)
}
// nepTotalSupply invokes `totalSupply` NEP* method on the specified contract.
func (c *Client) nepTotalSupply(tokenHash util.Uint160) (int64, error) {
result, err := c.InvokeFunction(tokenHash, "totalSupply", []smartcontract.Parameter{}, nil)
if err != nil {
return 0, err
}
err = getInvocationError(result)
if err != nil {
return 0, err
}
return topIntFromStack(result.Stack)
}
// nepBalanceOf invokes `balanceOf` NEP* method on the specified contract.
func (c *Client) nepBalanceOf(tokenHash, acc util.Uint160, tokenID []byte) (int64, error) {
params := []smartcontract.Parameter{{
Type: smartcontract.Hash160Type,
Value: acc,
}}
if tokenID != nil {
params = append(params, smartcontract.Parameter{
Type: smartcontract.ByteArrayType,
Value: tokenID,
})
}
result, err := c.InvokeFunction(tokenHash, "balanceOf", params, nil)
if err != nil {
return 0, err
}
err = getInvocationError(result)
if err != nil {
return 0, err
}
return topIntFromStack(result.Stack)
}
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// nepTokenInfo returns full NEP* token info.
func (c *Client) nepTokenInfo(tokenHash util.Uint160, standard string) (*wallet.Token, error) {
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cs, err := c.GetContractStateByHash(tokenHash)
if err != nil {
return nil, err
}
var isStandardOK bool
for _, st := range cs.Manifest.SupportedStandards {
if st == standard {
isStandardOK = true
break
}
}
if !isStandardOK {
return nil, fmt.Errorf("token %s does not support %s standard", tokenHash.StringLE(), standard)
}
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symbol, err := c.nepSymbol(tokenHash)
if err != nil {
return nil, err
}
decimals, err := c.nepDecimals(tokenHash)
if err != nil {
return nil, err
}
return wallet.NewToken(tokenHash, cs.Manifest.Name, symbol, decimals, standard), nil
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}