132 lines
4.1 KiB
Go
132 lines
4.1 KiB
Go
package contract
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import (
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"errors"
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"fmt"
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"strings"
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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/smartcontract/callflag"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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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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)
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// Call calls a contract.
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func Call(ic *interop.Context) error {
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h := ic.VM.Estack().Pop().Bytes()
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method := ic.VM.Estack().Pop().String()
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args := ic.VM.Estack().Pop().Array()
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return callExInternal(ic, h, method, args, callflag.All)
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}
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// CallEx calls a contract with flags.
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func CallEx(ic *interop.Context) error {
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h := ic.VM.Estack().Pop().Bytes()
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method := ic.VM.Estack().Pop().String()
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args := ic.VM.Estack().Pop().Array()
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fs := callflag.CallFlag(int32(ic.VM.Estack().Pop().BigInt().Int64()))
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if fs&^callflag.All != 0 {
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return errors.New("call flags out of range")
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}
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return callExInternal(ic, h, method, args, fs)
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}
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func callExInternal(ic *interop.Context, h []byte, name string, args []stackitem.Item, f callflag.CallFlag) error {
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u, err := util.Uint160DecodeBytesBE(h)
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if err != nil {
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return errors.New("invalid contract hash")
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}
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cs, err := ic.GetContract(u)
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if err != nil {
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return fmt.Errorf("contract not found: %w", err)
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}
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if strings.HasPrefix(name, "_") {
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return errors.New("invalid method name (starts with '_')")
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}
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md := cs.Manifest.ABI.GetMethod(name)
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if md == nil {
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return errors.New("method not found")
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}
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if md.Safe {
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f &^= callflag.WriteStates
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} else if ctx := ic.VM.Context(); ctx != nil && ctx.IsDeployed() {
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curr, err := ic.GetContract(ic.VM.GetCurrentScriptHash())
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if err == nil {
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if !curr.Manifest.CanCall(u, &cs.Manifest, name) {
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return errors.New("disallowed method call")
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}
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}
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}
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return CallExInternal(ic, cs, name, args, f, vm.EnsureNotEmpty)
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}
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// CallExInternal calls a contract with flags and can't be invoked directly by user.
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func CallExInternal(ic *interop.Context, cs *state.Contract,
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name string, args []stackitem.Item, f callflag.CallFlag, checkReturn vm.CheckReturnState) error {
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return callExFromNative(ic, ic.VM.GetCurrentScriptHash(), cs, name, args, f, checkReturn)
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}
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// callExFromNative calls a contract with flags using provided calling hash.
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func callExFromNative(ic *interop.Context, caller util.Uint160, cs *state.Contract,
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name string, args []stackitem.Item, f callflag.CallFlag, checkReturn vm.CheckReturnState) error {
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md := cs.Manifest.ABI.GetMethod(name)
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if md == nil {
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return fmt.Errorf("method '%s' not found", name)
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}
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if len(args) != len(md.Parameters) {
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return fmt.Errorf("invalid argument count: %d (expected %d)", len(args), len(md.Parameters))
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}
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ic.VM.Invocations[cs.Hash]++
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ic.VM.LoadScriptWithCallingHash(caller, cs.NEF.Script, cs.Hash, ic.VM.Context().GetCallFlags()&f)
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var isNative bool
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for i := range ic.Natives {
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if ic.Natives[i].Metadata().Hash.Equals(cs.Hash) {
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isNative = true
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break
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}
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}
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if isNative {
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ic.VM.Estack().PushVal(args)
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ic.VM.Estack().PushVal(name)
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} else {
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for i := len(args) - 1; i >= 0; i-- {
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ic.VM.Estack().PushVal(args[i])
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}
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// use Jump not Call here because context was loaded in LoadScript above.
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ic.VM.Jump(ic.VM.Context(), md.Offset)
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}
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ic.VM.Context().CheckReturn = checkReturn
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md = cs.Manifest.ABI.GetMethod(manifest.MethodInit)
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if md != nil {
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ic.VM.Call(ic.VM.Context(), md.Offset)
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}
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return nil
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}
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// ErrNativeCall is returned for failed calls from native.
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var ErrNativeCall = errors.New("error during call from native")
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// CallFromNative performs synchronous call from native contract.
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func CallFromNative(ic *interop.Context, caller util.Uint160, cs *state.Contract, method string, args []stackitem.Item, checkReturn vm.CheckReturnState) error {
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startSize := ic.VM.Istack().Len()
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if err := callExFromNative(ic, caller, cs, method, args, callflag.All, checkReturn); err != nil {
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return err
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}
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for !ic.VM.HasStopped() && ic.VM.Istack().Len() > startSize {
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if err := ic.VM.Step(); err != nil {
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return fmt.Errorf("%w: %v", ErrNativeCall, err)
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}
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}
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if ic.VM.State() == vm.FaultState {
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return ErrNativeCall
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}
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return nil
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}
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