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account_creator.go
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account_creator.go
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package environment
import (
"fmt"
"github.com/onflow/cadence/runtime/common"
"github.com/onflow/flow-go/fvm/errors"
"github.com/onflow/flow-go/fvm/storage/state"
"github.com/onflow/flow-go/fvm/tracing"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/module/trace"
)
type AddressGenerator interface {
Bytes() []byte
NextAddress() (flow.Address, error)
CurrentAddress() flow.Address
AddressCount() uint64
}
type BootstrapAccountCreator interface {
CreateBootstrapAccount(
publicKeys []flow.AccountPublicKey,
) (
flow.Address,
error,
)
}
// This ensures cadence can't access unexpected operations while parsing
// programs.
type ParseRestrictedAccountCreator struct {
txnState state.NestedTransactionPreparer
impl AccountCreator
}
func NewParseRestrictedAccountCreator(
txnState state.NestedTransactionPreparer,
creator AccountCreator,
) AccountCreator {
return ParseRestrictedAccountCreator{
txnState: txnState,
impl: creator,
}
}
func (creator ParseRestrictedAccountCreator) CreateAccount(
runtimePayer common.Address,
) (
common.Address,
error,
) {
return parseRestrict1Arg1Ret(
creator.txnState,
trace.FVMEnvCreateAccount,
creator.impl.CreateAccount,
runtimePayer)
}
type AccountCreator interface {
CreateAccount(runtimePayer common.Address) (common.Address, error)
}
type NoAccountCreator struct {
}
func (NoAccountCreator) CreateAccount(
runtimePayer common.Address,
) (
common.Address,
error,
) {
return common.Address{}, errors.NewOperationNotSupportedError(
"CreateAccount")
}
// accountCreator make use of the storage state and the chain's address
// generator to create accounts.
//
// It also serves as a decorator for the chain's address generator which
// updates the state when next address is called (This secondary functionality
// is only used in utility command line).
type accountCreator struct {
txnState state.NestedTransactionPreparer
chain flow.Chain
accounts Accounts
isServiceAccountEnabled bool
tracer tracing.TracerSpan
meter Meter
metrics MetricsReporter
systemContracts *SystemContracts
}
func NewAddressGenerator(
txnState state.NestedTransactionPreparer,
chain flow.Chain,
) AddressGenerator {
return &accountCreator{
txnState: txnState,
chain: chain,
}
}
func NewBootstrapAccountCreator(
txnState state.NestedTransactionPreparer,
chain flow.Chain,
accounts Accounts,
) BootstrapAccountCreator {
return &accountCreator{
txnState: txnState,
chain: chain,
accounts: accounts,
}
}
func NewAccountCreator(
txnState state.NestedTransactionPreparer,
chain flow.Chain,
accounts Accounts,
isServiceAccountEnabled bool,
tracer tracing.TracerSpan,
meter Meter,
metrics MetricsReporter,
systemContracts *SystemContracts,
) AccountCreator {
return &accountCreator{
txnState: txnState,
chain: chain,
accounts: accounts,
isServiceAccountEnabled: isServiceAccountEnabled,
tracer: tracer,
meter: meter,
metrics: metrics,
systemContracts: systemContracts,
}
}
func (creator *accountCreator) bytes() ([]byte, error) {
stateBytes, err := creator.txnState.Get(flow.AddressStateRegisterID)
if err != nil {
return nil, fmt.Errorf(
"failed to read address generator state from the state: %w",
err)
}
return stateBytes, nil
}
// TODO return error instead of a panic
// this requires changes outside of fvm since the type is defined on flow model
// and emulator and others might be dependent on that
func (creator *accountCreator) Bytes() []byte {
stateBytes, err := creator.bytes()
if err != nil {
panic(err)
}
return stateBytes
}
func (creator *accountCreator) constructAddressGen() (
flow.AddressGenerator,
error,
) {
stateBytes, err := creator.bytes()
if err != nil {
return nil, err
}
return creator.chain.BytesToAddressGenerator(stateBytes), nil
}
func (creator *accountCreator) NextAddress() (flow.Address, error) {
var address flow.Address
addressGenerator, err := creator.constructAddressGen()
if err != nil {
return address, err
}
address, err = addressGenerator.NextAddress()
if err != nil {
return address, err
}
// update the ledger state
err = creator.txnState.Set(
flow.AddressStateRegisterID,
addressGenerator.Bytes())
if err != nil {
return address, fmt.Errorf(
"failed to update the state with address generator state: %w",
err)
}
return address, nil
}
func (creator *accountCreator) CurrentAddress() flow.Address {
var address flow.Address
addressGenerator, err := creator.constructAddressGen()
if err != nil {
// TODO update CurrentAddress to return an error if needed
panic(err)
}
address = addressGenerator.CurrentAddress()
return address
}
func (creator *accountCreator) AddressCount() uint64 {
addressGenerator, err := creator.constructAddressGen()
if err != nil {
// TODO update CurrentAddress to return an error if needed
panic(err)
}
return addressGenerator.AddressCount()
}
func (creator *accountCreator) createBasicAccount(
publicKeys []flow.AccountPublicKey,
) (
flow.Address,
error,
) {
flowAddress, err := creator.NextAddress()
if err != nil {
return flow.EmptyAddress, err
}
err = creator.accounts.Create(publicKeys, flowAddress)
if err != nil {
return flow.EmptyAddress, fmt.Errorf("create account failed: %w", err)
}
return flowAddress, nil
}
func (creator *accountCreator) CreateBootstrapAccount(
publicKeys []flow.AccountPublicKey,
) (
flow.Address,
error,
) {
return creator.createBasicAccount(publicKeys)
}
func (creator *accountCreator) CreateAccount(
runtimePayer common.Address,
) (
common.Address,
error,
) {
defer creator.tracer.StartChildSpan(trace.FVMEnvCreateAccount).End()
err := creator.meter.MeterComputation(ComputationKindCreateAccount, 1)
if err != nil {
return common.Address{}, err
}
// don't enforce limit during account creation
var address flow.Address
creator.txnState.RunWithAllLimitsDisabled(func() {
address, err = creator.createAccount(flow.ConvertAddress(runtimePayer))
})
return common.MustBytesToAddress(address.Bytes()), err
}
func (creator *accountCreator) createAccount(
payer flow.Address,
) (
flow.Address,
error,
) {
address, err := creator.createBasicAccount(nil)
if err != nil {
return flow.EmptyAddress, err
}
if creator.isServiceAccountEnabled {
_, invokeErr := creator.systemContracts.SetupNewAccount(
address,
payer)
if invokeErr != nil {
return flow.EmptyAddress, invokeErr
}
}
creator.metrics.RuntimeSetNumberOfAccounts(creator.AddressCount())
return address, nil
}