mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-25 13:56:35 +00:00
96 lines
2.9 KiB
Go
96 lines
2.9 KiB
Go
package runtime
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import (
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"encoding/binary"
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"errors"
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"math/big"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"github.com/twmb/murmur3"
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)
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// GasLeft returns remaining amount of GAS.
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func GasLeft(ic *interop.Context) error {
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if ic.VM.GasLimit == -1 {
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ic.VM.Estack().PushItem(stackitem.NewBigInteger(big.NewInt(ic.VM.GasLimit)))
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} else {
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ic.VM.Estack().PushItem(stackitem.NewBigInteger(big.NewInt(ic.VM.GasLimit - ic.VM.GasConsumed())))
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}
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return nil
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}
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// GetNotifications returns notifications emitted by current contract execution.
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func GetNotifications(ic *interop.Context) error {
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item := ic.VM.Estack().Pop().Item()
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notifications := ic.Notifications
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if _, ok := item.(stackitem.Null); !ok {
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b, err := item.TryBytes()
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if err != nil {
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return err
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}
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u, err := util.Uint160DecodeBytesBE(b)
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if err != nil {
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return err
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}
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notifications = []state.NotificationEvent{}
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for i := range ic.Notifications {
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if ic.Notifications[i].ScriptHash.Equals(u) {
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notifications = append(notifications, ic.Notifications[i])
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}
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}
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}
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if len(notifications) > vm.MaxStackSize {
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return errors.New("too many notifications")
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}
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arr := stackitem.NewArray(make([]stackitem.Item, 0, len(notifications)))
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for i := range notifications {
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ev := stackitem.NewArray([]stackitem.Item{
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stackitem.NewByteArray(notifications[i].ScriptHash.BytesBE()),
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stackitem.Make(notifications[i].Name),
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stackitem.DeepCopy(notifications[i].Item).(*stackitem.Array),
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})
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arr.Append(ev)
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}
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ic.VM.Estack().PushItem(arr)
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return nil
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}
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// GetInvocationCounter returns how many times current contract was invoked during current tx execution.
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func GetInvocationCounter(ic *interop.Context) error {
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currentScriptHash := ic.VM.GetCurrentScriptHash()
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count, ok := ic.Invocations[currentScriptHash]
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if !ok {
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count = 1
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ic.Invocations[currentScriptHash] = count
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}
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ic.VM.Estack().PushItem(stackitem.NewBigInteger(big.NewInt(int64(count))))
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return nil
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}
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// GetNetwork returns chain network number.
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func GetNetwork(ic *interop.Context) error {
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m := ic.Chain.GetConfig().Magic
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ic.VM.Estack().PushItem(stackitem.NewBigInteger(big.NewInt(int64(m))))
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return nil
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}
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// GetRandom returns pseudo-random number which depends on block nonce and transaction hash.
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func GetRandom(ic *interop.Context) error {
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res := murmur128(ic.NonceData[:], ic.Network)
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ic.VM.Estack().PushItem(stackitem.NewBigInteger(bigint.FromBytesUnsigned(res)))
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copy(ic.NonceData[:], res)
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return nil
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}
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func murmur128(data []byte, seed uint32) []byte {
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h1, h2 := murmur3.SeedSum128(uint64(seed), uint64(seed), data)
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result := make([]byte, 16)
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binary.LittleEndian.PutUint64(result, h1)
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binary.LittleEndian.PutUint64(result[8:], h2)
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return result
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}
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