neoneo-go/pkg/core/native/native_nep17.go

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package native
import (
"errors"
"fmt"
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"math"
"math/big"
"github.com/nspcc-dev/neo-go/pkg/core/dao"
"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/interop/contract"
"github.com/nspcc-dev/neo-go/pkg/core/interop/runtime"
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// prefixAccount is the standard prefix used to store account data.
const prefixAccount = 20
// makeAccountKey creates a key from account script hash.
func makeAccountKey(h util.Uint160) []byte {
return makeUint160Key(prefixAccount, h)
}
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// nep17TokenNative represents NEP-17 token contract.
type nep17TokenNative struct {
interop.ContractMD
symbol string
decimals int64
factor int64
incBalance func(*interop.Context, util.Uint160, *state.StorageItem, *big.Int, *big.Int) error
balFromBytes func(item *state.StorageItem) (*big.Int, error)
}
// totalSupplyKey is the key used to store totalSupply value.
var totalSupplyKey = []byte{11}
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func (c *nep17TokenNative) Metadata() *interop.ContractMD {
return &c.ContractMD
}
func newNEP17Native(name string, id int32) *nep17TokenNative {
n := &nep17TokenNative{ContractMD: *interop.NewContractMD(name, id)}
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n.Manifest.SupportedStandards = []string{manifest.NEP17StandardName}
desc := newDescriptor("symbol", smartcontract.StringType)
md := newMethodAndPrice(n.Symbol, 0, callflag.NoneFlag)
n.AddMethod(md, desc)
desc = newDescriptor("decimals", smartcontract.IntegerType)
md = newMethodAndPrice(n.Decimals, 0, callflag.NoneFlag)
n.AddMethod(md, desc)
desc = newDescriptor("totalSupply", smartcontract.IntegerType)
md = newMethodAndPrice(n.TotalSupply, 1<<15, callflag.ReadStates)
n.AddMethod(md, desc)
desc = newDescriptor("balanceOf", smartcontract.IntegerType,
manifest.NewParameter("account", smartcontract.Hash160Type))
md = newMethodAndPrice(n.balanceOf, 1<<15, callflag.ReadStates)
n.AddMethod(md, desc)
transferParams := []manifest.Parameter{
manifest.NewParameter("from", smartcontract.Hash160Type),
manifest.NewParameter("to", smartcontract.Hash160Type),
manifest.NewParameter("amount", smartcontract.IntegerType),
}
desc = newDescriptor("transfer", smartcontract.BoolType,
append(transferParams, manifest.NewParameter("data", smartcontract.AnyType))...,
)
md = newMethodAndPrice(n.Transfer, 1<<17, callflag.States|callflag.AllowCall|callflag.AllowNotify)
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md.StorageFee = 50
n.AddMethod(md, desc)
n.AddEvent("Transfer", transferParams...)
return n
}
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func (c *nep17TokenNative) Initialize(_ *interop.Context) error {
return nil
}
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func (c *nep17TokenNative) Symbol(_ *interop.Context, _ []stackitem.Item) stackitem.Item {
return stackitem.NewByteArray([]byte(c.symbol))
}
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func (c *nep17TokenNative) Decimals(_ *interop.Context, _ []stackitem.Item) stackitem.Item {
return stackitem.NewBigInteger(big.NewInt(c.decimals))
}
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func (c *nep17TokenNative) TotalSupply(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
_, supply := c.getTotalSupply(ic.DAO)
return stackitem.NewBigInteger(supply)
}
func (c *nep17TokenNative) getTotalSupply(d dao.DAO) (state.StorageItem, *big.Int) {
si := d.GetStorageItem(c.ID, totalSupplyKey)
if si == nil {
si = []byte{}
}
return si, bigint.FromBytes(si)
}
func (c *nep17TokenNative) saveTotalSupply(d dao.DAO, si state.StorageItem, supply *big.Int) error {
si = state.StorageItem(bigint.ToPreallocatedBytes(supply, si))
return d.PutStorageItem(c.ID, totalSupplyKey, si)
}
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func (c *nep17TokenNative) Transfer(ic *interop.Context, args []stackitem.Item) stackitem.Item {
from := toUint160(args[0])
to := toUint160(args[1])
amount := toBigInt(args[2])
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err := c.TransferInternal(ic, from, to, amount, args[3])
return stackitem.NewBool(err == nil)
}
func addrToStackItem(u *util.Uint160) stackitem.Item {
if u == nil {
return stackitem.Null{}
}
return stackitem.NewByteArray(u.BytesBE())
}
func (c *nep17TokenNative) postTransfer(ic *interop.Context, from, to *util.Uint160, amount *big.Int,
data stackitem.Item, callOnPayment bool) {
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c.emitTransfer(ic, from, to, amount)
if to == nil || !callOnPayment {
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return
}
cs, err := ic.GetContract(*to)
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if err != nil {
return
}
fromArg := stackitem.Item(stackitem.Null{})
if from != nil {
fromArg = stackitem.NewByteArray((*from).BytesBE())
}
args := []stackitem.Item{
fromArg,
stackitem.NewBigInteger(amount),
data,
}
if err := contract.CallFromNative(ic, c.Hash, cs, manifest.MethodOnNEP17Payment, args, false); err != nil {
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panic(err)
}
}
func (c *nep17TokenNative) emitTransfer(ic *interop.Context, from, to *util.Uint160, amount *big.Int) {
ne := state.NotificationEvent{
ScriptHash: c.Hash,
Name: "Transfer",
Item: stackitem.NewArray([]stackitem.Item{
addrToStackItem(from),
addrToStackItem(to),
stackitem.NewBigInteger(amount),
}),
}
ic.Notifications = append(ic.Notifications, ne)
}
core: do not allow NEP17 roundtrip in case of insufficient funds NEP17 roundtrip is prohibited if from account doesn't have enough funds. This commit fixes states diff in block 92057 where account NfuwpaQ1A2xaeVbxWe8FRtaRgaMa8yF3YM initiates two NEO roundtrips with amount exceeding the account's balance: block 92057: value mismatch for key +////xTbYWBH3r5qhRKZAPFPHabKfb2vhQ==: QQMhAkwBIQOZZwEA vs QQMhAkwBIQN/ZwEA block 92057: value mismatch for key +v///ws=: kqlddcitCg== vs tphddcitCg== block 92057: value mismatch for key +v///xTbYWBH3r5qhRKZAPFPHabKfb2vhQ==: QQEhBUWyDu0W vs QQEhBWmhDu0W C#'s applog (contains False and False on stack for both transfers): ``` { "id" : 1, "jsonrpc" : "2.0", "result" : { "executions" : [ { "gasconsumed" : "11955500", "exception" : null, "stack" : [ { "value" : false, "type" : "Boolean" }, { "value" : false, "type" : "Boolean" } ], "vmstate" : "HALT", "trigger" : "Application", "notifications" : [] } ], "txid" : "0x8e73a7e9a566a514813907272ad65fc965002c3b098eacc5bdda529af19d7688" } } ``` Go's applog (both transfers succeeded and GAS minted): ``` { "result" : { "executions" : [ { "gasconsumed" : "11955500", "trigger" : "Application", "stack" : [ { "type" : "Boolean", "value" : true }, { "type" : "Boolean", "value" : true } ], "vmstate" : "HALT", "notifications" : [ { "eventname" : "Transfer", "contract" : "0xd2a4cff31913016155e38e474a2c06d08be276cf", "state" : { "value" : [ { "type" : "Any" }, { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "value" : "4316", "type" : "Integer" } ], "type" : "Array" } }, { "state" : { "type" : "Array", "value" : [ { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "type" : "ByteString", "value" : "22FgR96+aoUSmQDxTx2myn29r4U=" }, { "type" : "Integer", "value" : "1111111111" } ] }, "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "eventname" : "Transfer" }, { "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "state" : { "type" : "Array", "value" : [ { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "type" : "ByteString", "value" : "22FgR96+aoUSmQDxTx2myn29r4U=" }, { "type" : "Integer", "value" : "1111111" } ] }, "eventname" : "Transfer" } ] } ], "txid" : "0x8e73a7e9a566a514813907272ad65fc965002c3b098eacc5bdda529af19d7688" }, "id" : 1, "jsonrpc" : "2.0" } ```
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// updateAccBalance adds specified amount to the acc's balance. If requiredBalance
// is set and amount is 0, then acc's balance is checked against requiredBalance.
func (c *nep17TokenNative) updateAccBalance(ic *interop.Context, acc util.Uint160, amount *big.Int, requiredBalance *big.Int) error {
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key := makeAccountKey(acc)
si := ic.DAO.GetStorageItem(c.ID, key)
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if si == nil {
core: allow transfer 0 GAS/NEO with zero balance This commit fixes states diff at 131795 block of mainnet. Transaction: ``` NEO-GO-VM > loadbase64 DAAQDBSPsxdYh6cITC3gUKI4oWmYxJs49gwUj7MXWIenCEwt4FCiOKFpmMSbOPYUwB8MCHRyYW5zZmVyDBT1Y+pAvCg9TQ4FxI6jBbPyoHNA70FifVtSOQwAEQwUj7MXWIenCEwt4FCiOKFpmMSbOPYMFL1Mb4Fqp6gHiEwzM6xSc8fLS+RpFMAfDAh0cmFuc2ZlcgwU9WPqQLwoPU0OBcSOowWz8qBzQO9BYn1bUjk= READY: loaded 176 instructions NEO-GO-VM 0 > ops INDEX OPCODE PARAMETER 0 PUSHDATA1 ("") << 2 PUSH0 3 PUSHDATA1 8fb3175887a7084c2de050a238a16998c49b38f6 25 PUSHDATA1 8fb3175887a7084c2de050a238a16998c49b38f6 47 PUSH4 48 PACK 49 PUSH15 50 PUSHDATA1 7472616e73666572 ("transfer") 60 PUSHDATA1 f563ea40bc283d4d0e05c48ea305b3f2a07340ef // NEO token 82 SYSCALL System.Contract.Call (627d5b52) 87 ASSERT 88 PUSHDATA1 ("") 90 PUSH1 91 PUSHDATA1 8fb3175887a7084c2de050a238a16998c49b38f6 113 PUSHDATA1 bd4c6f816aa7a807884c3333ac5273c7cb4be469 135 PUSH4 136 PACK 137 PUSH15 138 PUSHDATA1 7472616e73666572 ("transfer") 148 PUSHDATA1 f563ea40bc283d4d0e05c48ea305b3f2a07340ef // NEO token 170 SYSCALL System.Contract.Call (627d5b52) 175 ASSERT ``` Go's applog: ``` { "id" : 1, "result" : { "txid" : "0x97d2ccb01467b22c73a2cb95f7af298f3a5bd8c849d7044371898b8efecdaabd", "executions" : [ { "exception" : "at instruction 87 (ASSERT): ASSERT failed", "stack" : [], "gasconsumed" : "4988995", "notifications" : [], "trigger" : "Application", "vmstate" : "FAULT" } ] }, "jsonrpc" : "2.0" } ``` C#'s applog: ``` { "jsonrpc" : "2.0", "result" : { "executions" : [ { "stack" : [], "notifications" : [ { "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "state" : { "type" : "Array", "value" : [ { "type" : "ByteString", "value" : "j7MXWIenCEwt4FCiOKFpmMSbOPY=" }, { "type" : "ByteString", "value" : "j7MXWIenCEwt4FCiOKFpmMSbOPY=" }, { "value" : "0", "type" : "Integer" } ] }, "eventname" : "Transfer" }, { "contract" : "0xd2a4cff31913016155e38e474a2c06d08be276cf", "state" : { "value" : [ { "type" : "Any" }, { "type" : "ByteString", "value" : "vUxvgWqnqAeITDMzrFJzx8tL5Gk=" }, { "value" : "2490", "type" : "Integer" } ], "type" : "Array" }, "eventname" : "Transfer" }, { "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "state" : { "value" : [ { "value" : "vUxvgWqnqAeITDMzrFJzx8tL5Gk=", "type" : "ByteString" }, { "value" : "j7MXWIenCEwt4FCiOKFpmMSbOPY=", "type" : "ByteString" }, { "value" : "1", "type" : "Integer" } ], "type" : "Array" }, "eventname" : "Transfer" } ], "vmstate" : "HALT", "gasconsumed" : "9977990", "trigger" : "Application", "exception" : null } ], "txid" : "0x97d2ccb01467b22c73a2cb95f7af298f3a5bd8c849d7044371898b8efecdaabd" }, "id" : 1 } ```
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if amount.Sign() < 0 {
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return errors.New("insufficient funds")
}
core: allow transfer 0 GAS/NEO with zero balance This commit fixes states diff at 131795 block of mainnet. Transaction: ``` NEO-GO-VM > loadbase64 DAAQDBSPsxdYh6cITC3gUKI4oWmYxJs49gwUj7MXWIenCEwt4FCiOKFpmMSbOPYUwB8MCHRyYW5zZmVyDBT1Y+pAvCg9TQ4FxI6jBbPyoHNA70FifVtSOQwAEQwUj7MXWIenCEwt4FCiOKFpmMSbOPYMFL1Mb4Fqp6gHiEwzM6xSc8fLS+RpFMAfDAh0cmFuc2ZlcgwU9WPqQLwoPU0OBcSOowWz8qBzQO9BYn1bUjk= READY: loaded 176 instructions NEO-GO-VM 0 > ops INDEX OPCODE PARAMETER 0 PUSHDATA1 ("") << 2 PUSH0 3 PUSHDATA1 8fb3175887a7084c2de050a238a16998c49b38f6 25 PUSHDATA1 8fb3175887a7084c2de050a238a16998c49b38f6 47 PUSH4 48 PACK 49 PUSH15 50 PUSHDATA1 7472616e73666572 ("transfer") 60 PUSHDATA1 f563ea40bc283d4d0e05c48ea305b3f2a07340ef // NEO token 82 SYSCALL System.Contract.Call (627d5b52) 87 ASSERT 88 PUSHDATA1 ("") 90 PUSH1 91 PUSHDATA1 8fb3175887a7084c2de050a238a16998c49b38f6 113 PUSHDATA1 bd4c6f816aa7a807884c3333ac5273c7cb4be469 135 PUSH4 136 PACK 137 PUSH15 138 PUSHDATA1 7472616e73666572 ("transfer") 148 PUSHDATA1 f563ea40bc283d4d0e05c48ea305b3f2a07340ef // NEO token 170 SYSCALL System.Contract.Call (627d5b52) 175 ASSERT ``` Go's applog: ``` { "id" : 1, "result" : { "txid" : "0x97d2ccb01467b22c73a2cb95f7af298f3a5bd8c849d7044371898b8efecdaabd", "executions" : [ { "exception" : "at instruction 87 (ASSERT): ASSERT failed", "stack" : [], "gasconsumed" : "4988995", "notifications" : [], "trigger" : "Application", "vmstate" : "FAULT" } ] }, "jsonrpc" : "2.0" } ``` C#'s applog: ``` { "jsonrpc" : "2.0", "result" : { "executions" : [ { "stack" : [], "notifications" : [ { "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "state" : { "type" : "Array", "value" : [ { "type" : "ByteString", "value" : "j7MXWIenCEwt4FCiOKFpmMSbOPY=" }, { "type" : "ByteString", "value" : "j7MXWIenCEwt4FCiOKFpmMSbOPY=" }, { "value" : "0", "type" : "Integer" } ] }, "eventname" : "Transfer" }, { "contract" : "0xd2a4cff31913016155e38e474a2c06d08be276cf", "state" : { "value" : [ { "type" : "Any" }, { "type" : "ByteString", "value" : "vUxvgWqnqAeITDMzrFJzx8tL5Gk=" }, { "value" : "2490", "type" : "Integer" } ], "type" : "Array" }, "eventname" : "Transfer" }, { "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "state" : { "value" : [ { "value" : "vUxvgWqnqAeITDMzrFJzx8tL5Gk=", "type" : "ByteString" }, { "value" : "j7MXWIenCEwt4FCiOKFpmMSbOPY=", "type" : "ByteString" }, { "value" : "1", "type" : "Integer" } ], "type" : "Array" }, "eventname" : "Transfer" } ], "vmstate" : "HALT", "gasconsumed" : "9977990", "trigger" : "Application", "exception" : null } ], "txid" : "0x97d2ccb01467b22c73a2cb95f7af298f3a5bd8c849d7044371898b8efecdaabd" }, "id" : 1 } ```
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if amount.Sign() == 0 {
// it's OK to transfer 0 if the balance 0, no need to put si to the storage
return nil
}
si = state.StorageItem{}
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}
err := c.incBalance(ic, acc, &si, amount, requiredBalance)
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if err != nil {
if si != nil && amount.Sign() <= 0 {
_ = ic.DAO.PutStorageItem(c.ID, key, si)
}
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return err
}
if si == nil {
err = ic.DAO.DeleteStorageItem(c.ID, key)
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} else {
err = ic.DAO.PutStorageItem(c.ID, key, si)
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}
return err
}
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// TransferInternal transfers NEO between accounts.
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func (c *nep17TokenNative) TransferInternal(ic *interop.Context, from, to util.Uint160, amount *big.Int, data stackitem.Item) error {
if amount.Sign() == -1 {
return errors.New("negative amount")
}
caller := ic.VM.GetCallingScriptHash()
if caller.Equals(util.Uint160{}) || !from.Equals(caller) {
ok, err := runtime.CheckHashedWitness(ic, from)
if err != nil {
return err
} else if !ok {
return errors.New("invalid signature")
}
}
isEmpty := from.Equals(to) || amount.Sign() == 0
inc := amount
if isEmpty {
inc = big.NewInt(0)
} else {
inc = new(big.Int).Neg(inc)
}
core: do not allow NEP17 roundtrip in case of insufficient funds NEP17 roundtrip is prohibited if from account doesn't have enough funds. This commit fixes states diff in block 92057 where account NfuwpaQ1A2xaeVbxWe8FRtaRgaMa8yF3YM initiates two NEO roundtrips with amount exceeding the account's balance: block 92057: value mismatch for key +////xTbYWBH3r5qhRKZAPFPHabKfb2vhQ==: QQMhAkwBIQOZZwEA vs QQMhAkwBIQN/ZwEA block 92057: value mismatch for key +v///ws=: kqlddcitCg== vs tphddcitCg== block 92057: value mismatch for key +v///xTbYWBH3r5qhRKZAPFPHabKfb2vhQ==: QQEhBUWyDu0W vs QQEhBWmhDu0W C#'s applog (contains False and False on stack for both transfers): ``` { "id" : 1, "jsonrpc" : "2.0", "result" : { "executions" : [ { "gasconsumed" : "11955500", "exception" : null, "stack" : [ { "value" : false, "type" : "Boolean" }, { "value" : false, "type" : "Boolean" } ], "vmstate" : "HALT", "trigger" : "Application", "notifications" : [] } ], "txid" : "0x8e73a7e9a566a514813907272ad65fc965002c3b098eacc5bdda529af19d7688" } } ``` Go's applog (both transfers succeeded and GAS minted): ``` { "result" : { "executions" : [ { "gasconsumed" : "11955500", "trigger" : "Application", "stack" : [ { "type" : "Boolean", "value" : true }, { "type" : "Boolean", "value" : true } ], "vmstate" : "HALT", "notifications" : [ { "eventname" : "Transfer", "contract" : "0xd2a4cff31913016155e38e474a2c06d08be276cf", "state" : { "value" : [ { "type" : "Any" }, { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "value" : "4316", "type" : "Integer" } ], "type" : "Array" } }, { "state" : { "type" : "Array", "value" : [ { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "type" : "ByteString", "value" : "22FgR96+aoUSmQDxTx2myn29r4U=" }, { "type" : "Integer", "value" : "1111111111" } ] }, "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "eventname" : "Transfer" }, { "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "state" : { "type" : "Array", "value" : [ { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "type" : "ByteString", "value" : "22FgR96+aoUSmQDxTx2myn29r4U=" }, { "type" : "Integer", "value" : "1111111" } ] }, "eventname" : "Transfer" } ] } ], "txid" : "0x8e73a7e9a566a514813907272ad65fc965002c3b098eacc5bdda529af19d7688" }, "id" : 1, "jsonrpc" : "2.0" } ```
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if err := c.updateAccBalance(ic, from, inc, amount); err != nil {
return err
}
if !isEmpty {
core: do not allow NEP17 roundtrip in case of insufficient funds NEP17 roundtrip is prohibited if from account doesn't have enough funds. This commit fixes states diff in block 92057 where account NfuwpaQ1A2xaeVbxWe8FRtaRgaMa8yF3YM initiates two NEO roundtrips with amount exceeding the account's balance: block 92057: value mismatch for key +////xTbYWBH3r5qhRKZAPFPHabKfb2vhQ==: QQMhAkwBIQOZZwEA vs QQMhAkwBIQN/ZwEA block 92057: value mismatch for key +v///ws=: kqlddcitCg== vs tphddcitCg== block 92057: value mismatch for key +v///xTbYWBH3r5qhRKZAPFPHabKfb2vhQ==: QQEhBUWyDu0W vs QQEhBWmhDu0W C#'s applog (contains False and False on stack for both transfers): ``` { "id" : 1, "jsonrpc" : "2.0", "result" : { "executions" : [ { "gasconsumed" : "11955500", "exception" : null, "stack" : [ { "value" : false, "type" : "Boolean" }, { "value" : false, "type" : "Boolean" } ], "vmstate" : "HALT", "trigger" : "Application", "notifications" : [] } ], "txid" : "0x8e73a7e9a566a514813907272ad65fc965002c3b098eacc5bdda529af19d7688" } } ``` Go's applog (both transfers succeeded and GAS minted): ``` { "result" : { "executions" : [ { "gasconsumed" : "11955500", "trigger" : "Application", "stack" : [ { "type" : "Boolean", "value" : true }, { "type" : "Boolean", "value" : true } ], "vmstate" : "HALT", "notifications" : [ { "eventname" : "Transfer", "contract" : "0xd2a4cff31913016155e38e474a2c06d08be276cf", "state" : { "value" : [ { "type" : "Any" }, { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "value" : "4316", "type" : "Integer" } ], "type" : "Array" } }, { "state" : { "type" : "Array", "value" : [ { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "type" : "ByteString", "value" : "22FgR96+aoUSmQDxTx2myn29r4U=" }, { "type" : "Integer", "value" : "1111111111" } ] }, "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "eventname" : "Transfer" }, { "contract" : "0xef4073a0f2b305a38ec4050e4d3d28bc40ea63f5", "state" : { "type" : "Array", "value" : [ { "value" : "22FgR96+aoUSmQDxTx2myn29r4U=", "type" : "ByteString" }, { "type" : "ByteString", "value" : "22FgR96+aoUSmQDxTx2myn29r4U=" }, { "type" : "Integer", "value" : "1111111" } ] }, "eventname" : "Transfer" } ] } ], "txid" : "0x8e73a7e9a566a514813907272ad65fc965002c3b098eacc5bdda529af19d7688" }, "id" : 1, "jsonrpc" : "2.0" } ```
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if err := c.updateAccBalance(ic, to, amount, nil); err != nil {
return err
}
}
c.postTransfer(ic, &from, &to, amount, data, true)
return nil
}
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func (c *nep17TokenNative) balanceOf(ic *interop.Context, args []stackitem.Item) stackitem.Item {
h := toUint160(args[0])
return stackitem.NewBigInteger(c.balanceOfInternal(ic.DAO, h))
}
func (c *nep17TokenNative) balanceOfInternal(d dao.DAO, h util.Uint160) *big.Int {
key := makeAccountKey(h)
si := d.GetStorageItem(c.ID, key)
if si == nil {
return big.NewInt(0)
}
balance, err := c.balFromBytes(&si)
if err != nil {
panic(fmt.Errorf("can not deserialize balance state: %w", err))
}
return balance
}
func (c *nep17TokenNative) mint(ic *interop.Context, h util.Uint160, amount *big.Int, callOnPayment bool) {
if amount.Sign() == 0 {
return
}
c.addTokens(ic, h, amount)
c.postTransfer(ic, nil, &h, amount, stackitem.Null{}, callOnPayment)
}
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func (c *nep17TokenNative) burn(ic *interop.Context, h util.Uint160, amount *big.Int) {
if amount.Sign() == 0 {
return
}
amount.Neg(amount)
c.addTokens(ic, h, amount)
amount.Neg(amount)
c.postTransfer(ic, &h, nil, amount, stackitem.Null{}, false)
}
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func (c *nep17TokenNative) addTokens(ic *interop.Context, h util.Uint160, amount *big.Int) {
if amount.Sign() == 0 {
return
}
key := makeAccountKey(h)
si := ic.DAO.GetStorageItem(c.ID, key)
if si == nil {
si = state.StorageItem{}
}
if err := c.incBalance(ic, h, &si, amount, nil); err != nil {
panic(err)
}
var err error
if si == nil {
err = ic.DAO.DeleteStorageItem(c.ID, key)
} else {
err = ic.DAO.PutStorageItem(c.ID, key, si)
}
if err != nil {
panic(err)
}
buf, supply := c.getTotalSupply(ic.DAO)
supply.Add(supply, amount)
err = c.saveTotalSupply(ic.DAO, buf, supply)
if err != nil {
panic(err)
}
}
func newDescriptor(name string, ret smartcontract.ParamType, ps ...manifest.Parameter) *manifest.Method {
if len(ps) == 0 {
ps = []manifest.Parameter{}
}
return &manifest.Method{
Name: name,
Parameters: ps,
ReturnType: ret,
}
}
func newMethodAndPrice(f interop.Method, cpuFee int64, flags callflag.CallFlag) *interop.MethodAndPrice {
return &interop.MethodAndPrice{
Func: f,
CPUFee: cpuFee,
RequiredFlags: flags,
}
}
func toBigInt(s stackitem.Item) *big.Int {
bi, err := s.TryInteger()
if err != nil {
panic(err)
}
return bi
}
func toUint160(s stackitem.Item) util.Uint160 {
buf, err := s.TryBytes()
if err != nil {
panic(err)
}
u, err := util.Uint160DecodeBytesBE(buf)
if err != nil {
panic(err)
}
return u
}
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func toUint32(s stackitem.Item) uint32 {
bigInt := toBigInt(s)
if !bigInt.IsUint64() {
panic("bigint is not an uint64")
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}
uint64Value := bigInt.Uint64()
if uint64Value > math.MaxUint32 {
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panic("bigint does not fit into uint32")
}
return uint32(uint64Value)
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}