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vm_manager.go
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vm_manager.go
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package vm
import (
"encoding/json"
"errors"
"github.com/BeDreamCoder/uwavm/bridge"
"github.com/BeDreamCoder/uwavm/common/db"
"github.com/BeDreamCoder/uwavm/common/util"
"github.com/BeDreamCoder/uwavm/contract/go/pb"
"github.com/BeDreamCoder/uwavm/vm/gas"
log "github.com/inconshreveable/log15"
)
// VMManager manages wasm contracts, include deploy contracts, instance wasm virtual machine, etc...
type VMManager struct {
db db.Database
vmimpl InstanceCreator
bridge *bridge.Bridge
}
// New instances a new VMManager
func NewVMManager(db db.Database, bridge *bridge.Bridge) *VMManager {
return &VMManager{
db: db,
bridge: bridge,
}
}
// RegisterSyscallService implements bridge.Executor
func (v *VMManager) RegisterSyscallService(syscall *bridge.SyscallService) {
vmimpl, err := Open("uwavm", syscall, v.db)
if err != nil {
panic(err)
}
v.vmimpl = vmimpl
}
// NewInstance implements bridge.Executor
func (v *VMManager) NewCreatorInstance(ctx *bridge.ContractState) (bridge.Instance, error) {
ins, err := v.vmimpl.CreateInstance(ctx)
if err != nil {
return nil, err
}
return &vmHandle{
ctx: ctx,
vmInstance: ins,
}, nil
}
// TODO:校验名字
func (v *VMManager) verifyContractName(name string) error {
return nil
}
// DeployContract deploy contract and initialize contract
func (v *VMManager) DeployContract(args map[string][]byte) (*pb.Response, gas.Limits, error) {
name := args["contract_name"]
if name == nil {
return nil, gas.Limits{}, errors.New("bad contract name")
}
contractName := string(name)
err := v.verifyContractName(contractName)
if err != nil {
return nil, gas.Limits{}, err
}
code := args["contract_code"]
if code == nil {
return nil, gas.Limits{}, errors.New("missing contract code")
}
language := args["language"]
if language == nil {
return nil, gas.Limits{}, errors.New("missing contract language")
}
initArgsBuf := args["args"]
if initArgsBuf == nil {
return nil, gas.Limits{}, errors.New("missing args field in args")
}
var initArgs map[string][]byte
if err = json.Unmarshal(initArgsBuf, &initArgs); err != nil {
return nil, gas.Limits{}, err
}
caller := args["caller"]
if caller == nil {
return nil, gas.Limits{}, errors.New("missing contract caller")
}
if err = v.db.Put(util.ContractCodeKey(contractName), code); err != nil {
return nil, gas.Limits{}, err
}
if err = v.db.Put(util.ContractCodeDescKey(contractName), language); err != nil {
return nil, gas.Limits{}, err
}
state := &bridge.ContractState{
ContractName: contractName,
Language: string(language),
Caller: string(caller),
}
out, resourceUsed, err := v.invokeContract(state, util.InitContractMethod, initArgs)
if err != nil {
if _, ok := err.(*bridge.ContractError); !ok {
v.vmimpl.RemoveCache(contractName)
}
log.Error("call contract initialize method error", "error", err, "contract", contractName)
return nil, gas.Limits{}, err
}
return out, resourceUsed, nil
}
func (v *VMManager) InvokeContract(method string, args map[string][]byte) (*pb.Response, gas.Limits, error) {
name := args["contract_name"]
if name == nil {
return nil, gas.Limits{}, errors.New("bad contract name")
}
contractName := string(name)
err := v.verifyContractName(contractName)
if err != nil {
return nil, gas.Limits{}, err
}
caller := args["caller"]
if caller == nil {
return nil, gas.Limits{}, errors.New("missing contract caller")
}
language := args["language"]
if language == nil {
return nil, gas.Limits{}, errors.New("missing contract language")
}
argsBuf := args["args"]
if argsBuf == nil {
return nil, gas.Limits{}, errors.New("missing args field in args")
}
var invokeArgs map[string][]byte
if err = json.Unmarshal(argsBuf, &invokeArgs); err != nil {
return nil, gas.Limits{}, err
}
state := &bridge.ContractState{
ContractName: contractName,
Language: string(language),
Caller: string(caller),
}
out, resourceUsed, err := v.invokeContract(state, method, invokeArgs)
if err != nil {
if _, ok := err.(*bridge.ContractError); !ok {
v.vmimpl.RemoveCache(contractName)
}
log.Error("call contract initialize method error", "error", err, "contract", contractName)
return nil, gas.Limits{}, err
}
return out, resourceUsed, nil
}
func (v *VMManager) invokeContract(state *bridge.ContractState, method string, args map[string][]byte) (*pb.Response, gas.Limits, error) {
vm, ok := v.bridge.GetVirtualMachine("wasm")
if !ok {
return nil, gas.Limits{}, errors.New("wasm vm not registered")
}
ctx, err := vm.NewVM(state)
if err != nil {
return nil, gas.Limits{}, err
}
out, err := ctx.Invoke(method, args)
if err != nil {
return nil, gas.Limits{}, err
}
return out, ctx.ResourceUsed(), nil
}