neoneo-go/pkg/rpc/request/txBuilder.go

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package request
import (
"errors"
"fmt"
"strconv"
"github.com/nspcc-dev/neo-go/pkg/core"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"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/emit"
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
)
// CreateDeploymentScript returns a script that deploys given smart contract
// with its metadata and system fee require for this.
func CreateDeploymentScript(avm []byte, manif *manifest.Manifest) ([]byte, util.Fixed8, error) {
script := io.NewBufBinWriter()
rawManifest, err := manif.MarshalJSON()
if err != nil {
return nil, 0, err
}
emit.Bytes(script.BinWriter, rawManifest)
emit.Bytes(script.BinWriter, avm)
emit.Syscall(script.BinWriter, "System.Contract.Create")
sysfee := util.Fixed8(core.StoragePrice * (len(avm) + len(rawManifest)))
return script.Bytes(), sysfee, nil
}
// expandArrayIntoScript pushes all FuncParam parameters from the given array
// into the given buffer in reverse order.
func expandArrayIntoScript(script *io.BinWriter, slice []Param) error {
for j := len(slice) - 1; j >= 0; j-- {
fp, err := slice[j].GetFuncParam()
if err != nil {
return err
}
switch fp.Type {
case smartcontract.ByteArrayType, smartcontract.SignatureType:
str, err := fp.Value.GetBytesHex()
if err != nil {
return err
}
emit.Bytes(script, str)
case smartcontract.StringType:
str, err := fp.Value.GetString()
if err != nil {
return err
}
emit.String(script, str)
case smartcontract.Hash160Type:
hash, err := fp.Value.GetUint160FromHex()
if err != nil {
return err
}
emit.Bytes(script, hash.BytesBE())
case smartcontract.Hash256Type:
hash, err := fp.Value.GetUint256()
if err != nil {
return err
}
emit.Bytes(script, hash.BytesBE())
case smartcontract.PublicKeyType:
str, err := fp.Value.GetString()
if err != nil {
return err
}
key, err := keys.NewPublicKeyFromString(string(str))
if err != nil {
return err
}
emit.Bytes(script, key.Bytes())
case smartcontract.IntegerType:
val, err := fp.Value.GetInt()
if err != nil {
return err
}
emit.Int(script, int64(val))
case smartcontract.BoolType:
str, err := fp.Value.GetString()
if err != nil {
return err
}
switch str {
case "true":
emit.Int(script, 1)
case "false":
emit.Int(script, 0)
default:
return errors.New("wrong boolean value")
}
default:
return fmt.Errorf("parameter type %v is not supported", fp.Type)
}
}
return nil
}
// CreateFunctionInvocationScript creates a script to invoke given contract with
// given parameters.
func CreateFunctionInvocationScript(contract util.Uint160, params Params) ([]byte, error) {
script := io.NewBufBinWriter()
for i := len(params) - 1; i >= 0; i-- {
switch params[i].Type {
case StringT:
emit.String(script.BinWriter, params[i].String())
case NumberT:
num, err := params[i].GetInt()
if err != nil {
return nil, err
}
emit.String(script.BinWriter, strconv.Itoa(num))
case ArrayT:
slice, err := params[i].GetArray()
if err != nil {
return nil, err
}
err = expandArrayIntoScript(script.BinWriter, slice)
if err != nil {
return nil, err
}
emit.Int(script.BinWriter, int64(len(slice)))
emit.Opcode(script.BinWriter, opcode.PACK)
}
}
emit.AppCall(script.BinWriter, contract)
return script.Bytes(), nil
}
// CreateInvocationScript creates a script to invoke given contract with
// given parameters. It differs from CreateFunctionInvocationScript in that it
// expects one array of FuncParams and expands it onto the stack as independent
// elements.
func CreateInvocationScript(contract util.Uint160, funcParams []Param) ([]byte, error) {
script := io.NewBufBinWriter()
err := expandArrayIntoScript(script.BinWriter, funcParams)
if err != nil {
return nil, err
}
emit.AppCall(script.BinWriter, contract)
return script.Bytes(), nil
}