/
resolver.go
185 lines (168 loc) · 5.76 KB
/
resolver.go
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package xvm
import (
"context"
"encoding/binary"
"fmt"
"github.com/superconsensus-chain/xupercore/kernel/contract/bridge"
"github.com/superconsensus-chain/xupercore/kernel/contract/bridge/memrpc"
"github.com/xuperchain/xvm/exec"
)
const (
contextIDKey = "ctxid"
responseKey = "callResponse"
)
type responseDesc struct {
Body []byte
Error bool
}
type syscallResolver struct {
syscall *bridge.SyscallService
rpcserver *memrpc.Server
}
func newSyscallResolver(syscall *bridge.SyscallService) exec.Resolver {
return &syscallResolver{
syscall: syscall,
rpcserver: memrpc.NewServer(syscall),
}
}
func (s *syscallResolver) ResolveGlobal(module, name string) (int64, bool) {
return 0, false
}
func (s *syscallResolver) ResolveFunc(module, name string) (interface{}, bool) {
fullname := module + "." + name
switch fullname {
case "go.github.com/xuperchain/xuperunion/contractsdk/go/driver/wasm.callMethod":
return s.goCallMethod, true
case "go.github.com/xuperchain/xuperunion/contractsdk/go/driver/wasm.fetchResponse":
return s.goFetchResponse, true
case "go.github.com/xuperchain/contract-sdk-go/driver/wasm.callMethod":
return s.goCallMethod, true
case "go.github.com/xuperchain/contract-sdk-go/driver/wasm.fetchResponse":
return s.goFetchResponse, true
case "go.github.com/xuperchain/xuperchain/core/contractsdk/go/driver/wasm.callMethod":
return s.goCallMethod, true
case "go.github.com/xuperchain/xuperchain/core/contractsdk/go/driver/wasm.fetchResponse":
return s.goFetchResponse, true
case "env._call_method":
return s.cCallMethod, true
case "env._call_method_v2":
return s.cCallMethodv2, true
case "env._fetch_response":
return s.cFetchResponse, true
default:
return nil, false
}
}
func (s *syscallResolver) goCallMethod(ctx exec.Context, sp uint32) uint32 {
codec := exec.NewCodec(ctx)
ctxid := ctx.GetUserData(contextIDKey).(int64)
method := codec.GoString(sp + 8)
requestBuf := codec.GoBytes(sp + 24)
responseBuf, err := s.rpcserver.CallMethod(context.TODO(), ctxid, method, requestBuf)
var responseDesc responseDesc
if err != nil {
responseDesc.Error = true
responseDesc.Body = []byte(err.Error())
} else {
responseDesc.Body = responseBuf
}
binary.LittleEndian.PutUint64(codec.Bytes(sp+48, 8), uint64(len(responseDesc.Body)))
ctx.SetUserData(responseKey, responseDesc)
return 0
}
func (s *syscallResolver) goFetchResponse(ctx exec.Context, sp uint32) uint32 {
codec := exec.NewCodec(ctx)
iresponse := ctx.GetUserData(responseKey)
if iresponse == nil {
exec.Throw(exec.NewTrap("call fetchResponse on nil value"))
}
response := iresponse.(responseDesc)
userbuf := codec.GoBytes(sp + 8)
if len(response.Body) != len(userbuf) {
exec.Throw(exec.NewTrap(fmt.Sprintf("call fetchResponse with bad length, got %d, expect %d", len(userbuf), len(response.Body))))
}
copy(userbuf, response.Body)
success := uint64(1)
if response.Error {
success = 0
}
binary.LittleEndian.PutUint64(codec.Bytes(sp+32, 8), success)
ctx.SetUserData(responseKey, nil)
return 0
}
func (s *syscallResolver) cCallMethod(ctx exec.Context, methodAddr, methodLen, requestAddr, requestLen uint32) uint32 {
codec := exec.NewCodec(ctx)
ctxid := ctx.GetUserData(contextIDKey).(int64)
method := codec.String(methodAddr, methodLen)
requestBuf := codec.Bytes(requestAddr, requestLen)
responseBuf, err := s.rpcserver.CallMethod(context.TODO(), ctxid, method, requestBuf)
var responseDesc responseDesc
if err != nil {
// log.Error("contract syscall error", "ctxid", ctxid, "method", method, "error", err)
responseDesc.Error = true
responseDesc.Body = []byte(err.Error())
} else {
responseDesc.Body = responseBuf
}
ctx.SetUserData(responseKey, responseDesc)
return uint32(len(responseDesc.Body))
}
func (s *syscallResolver) cFetchResponse(ctx exec.Context, userBuf, userLen uint32) uint32 {
codec := exec.NewCodec(ctx)
iresponse := ctx.GetUserData(responseKey)
if iresponse == nil {
exec.Throw(exec.NewTrap("call fetchResponse on nil value"))
}
response := iresponse.(responseDesc)
userbuf := codec.Bytes(userBuf, userLen)
if len(response.Body) != len(userbuf) {
exec.Throw(exec.NewTrap(fmt.Sprintf("call fetchResponse with bad length, got %d, expect %d", len(userbuf), len(response.Body))))
}
copy(userbuf, response.Body)
success := uint32(1)
if response.Error {
success = 0
}
ctx.SetUserData(responseKey, nil)
return success
}
func (s *syscallResolver) cCallMethodv2(
ctx exec.Context,
methodAddr, methodLen uint32,
requestAddr, requestLen uint32,
responseAddr, responseLen uint32,
successAddr uint32) uint32 {
codec := exec.NewCodec(ctx)
ctxid := ctx.GetUserData(contextIDKey).(int64)
method := codec.String(methodAddr, methodLen)
requestBuf := codec.Bytes(requestAddr, requestLen)
responseBuf := codec.Bytes(responseAddr, responseLen)
response, err := s.rpcserver.CallMethod(context.TODO(), ctxid, method, requestBuf)
// fast path
if err != nil {
// log.Error("contract syscall error", "ctxid", ctxid, "method", method, "error", err)
msg := err.Error()
if len(msg) <= len(responseBuf) {
copy(responseBuf, msg)
codec.SetUint32(successAddr, 0)
return uint32(len(msg))
}
} else {
if len(response) <= len(responseBuf) {
copy(responseBuf, response)
codec.SetUint32(successAddr, 1)
return uint32(len(response))
}
}
// slow path
var responseDesc responseDesc
if err != nil {
// log.Error("contract syscall error", "ctxid", ctxid, "method", method, "error", err)
responseDesc.Error = true
responseDesc.Body = []byte(err.Error())
} else {
responseDesc.Body = response
}
ctx.SetUserData(responseKey, responseDesc)
return uint32(len(responseDesc.Body))
}