/
mock_execution_chain.go
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/
mock_execution_chain.go
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// Package testing provides useful mocks for an eth1 powchain
// service as needed by unit tests for the beacon node.
package testing
import (
"context"
"fmt"
"math/big"
"net/http/httptest"
"time"
"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
gethTypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/rpc"
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/v4/async/event"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/execution/types"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
"github.com/prysmaticlabs/prysm/v4/config/params"
"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
)
// Chain defines a properly functioning mock for the powchain service.
type Chain struct {
ChainFeed *event.Feed
LatestBlockNumber *big.Int
HashesByHeight map[int][]byte
TimesByHeight map[int]uint64
BlockNumberByTime map[uint64]*big.Int
Eth1Data *ethpb.Eth1Data
GenesisEth1Block *big.Int
GenesisState state.BeaconState
CurrEndpoint string
CurrError error
Endpoints []string
Errors []error
}
// GenesisTime represents a static past date - JAN 01 2000.
var GenesisTime = time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
// New creates a new mock chain with empty block info.
func New() *Chain {
return &Chain{
HashesByHeight: make(map[int][]byte),
TimesByHeight: make(map[int]uint64),
BlockNumberByTime: make(map[uint64]*big.Int),
}
}
// GenesisExecutionChainInfo --
func (m *Chain) GenesisExecutionChainInfo() (uint64, *big.Int) {
blk := m.GenesisEth1Block
if blk == nil {
blk = big.NewInt(GenesisTime)
}
return uint64(GenesisTime), blk
}
// BlockExists --
func (m *Chain) BlockExists(_ context.Context, hash common.Hash) (bool, *big.Int, error) {
// Reverse the map of heights by hash.
heightsByHash := make(map[[32]byte]int, len(m.HashesByHeight))
for k, v := range m.HashesByHeight {
h := bytesutil.ToBytes32(v)
heightsByHash[h] = k
}
val, ok := heightsByHash[hash]
if !ok {
return false, nil, fmt.Errorf("could not fetch height for hash: %#x", hash)
}
return true, big.NewInt(int64(val)), nil
}
// BlockHashByHeight --
func (m *Chain) BlockHashByHeight(_ context.Context, height *big.Int) (common.Hash, error) {
k := int(height.Int64())
val, ok := m.HashesByHeight[k]
if !ok {
return [32]byte{}, fmt.Errorf("could not fetch hash for height: %v", height)
}
return bytesutil.ToBytes32(val), nil
}
// BlockTimeByHeight --
func (m *Chain) BlockTimeByHeight(_ context.Context, height *big.Int) (uint64, error) {
h := int(height.Int64())
return m.TimesByHeight[h], nil
}
// BlockByTimestamp --
func (m *Chain) BlockByTimestamp(_ context.Context, time uint64) (*types.HeaderInfo, error) {
var chosenTime uint64
var chosenNumber *big.Int
for t, num := range m.BlockNumberByTime {
if t > chosenTime && t <= time {
chosenNumber = num
chosenTime = t
}
}
return &types.HeaderInfo{Number: chosenNumber, Time: chosenTime}, nil
}
// ChainStartEth1Data --
func (m *Chain) ChainStartEth1Data() *ethpb.Eth1Data {
return m.Eth1Data
}
// PreGenesisState --
func (m *Chain) PreGenesisState() state.BeaconState {
return m.GenesisState
}
// ClearPreGenesisData --
func (*Chain) ClearPreGenesisData() {
// no-op
}
func (*Chain) ExecutionClientConnected() bool {
return true
}
func (m *Chain) ExecutionClientEndpoint() string {
return m.CurrEndpoint
}
func (m *Chain) ExecutionClientConnectionErr() error {
return m.CurrError
}
func (m *Chain) ETH1Endpoints() []string {
return m.Endpoints
}
func (m *Chain) ETH1ConnectionErrors() []error {
return m.Errors
}
// RPCClient defines the mock rpc client.
type RPCClient struct {
Backend *backends.SimulatedBackend
BlockNumMap map[uint64]*types.HeaderInfo
}
func (*RPCClient) Close() {}
func (r *RPCClient) CallContext(ctx context.Context, obj interface{}, methodName string, args ...interface{}) error {
if r.BlockNumMap != nil && methodName == "eth_getBlockByNumber" {
val, ok := args[0].(string)
if !ok {
return errors.Errorf("wrong argument type provided: %T", args[0])
}
num, err := hexutil.DecodeBig(val)
if err != nil {
return err
}
b := r.BlockNumMap[num.Uint64()]
assertedObj, ok := obj.(**types.HeaderInfo)
if !ok {
return errors.Errorf("wrong argument type provided: %T", obj)
}
*assertedObj = b
return nil
}
if r.Backend == nil && methodName == "eth_getBlockByNumber" {
h := &gethTypes.Header{
Number: big.NewInt(15),
Time: 150,
}
assertedObj, ok := obj.(**types.HeaderInfo)
if !ok {
return errors.Errorf("wrong argument type provided: %T", obj)
}
*assertedObj = &types.HeaderInfo{
Hash: h.Hash(),
Number: h.Number,
Time: h.Time,
}
return nil
}
switch methodName {
case "eth_getBlockByNumber":
val, ok := args[0].(string)
if !ok {
return errors.Errorf("wrong argument type provided: %T", args[0])
}
var num *big.Int
var err error
if val != "latest" {
num, err = hexutil.DecodeBig(val)
if err != nil {
return err
}
}
h, err := r.Backend.HeaderByNumber(ctx, num)
if err != nil {
return err
}
assertedObj, ok := obj.(**types.HeaderInfo)
if !ok {
return errors.Errorf("wrong argument type provided: %T", obj)
}
*assertedObj = &types.HeaderInfo{
Hash: h.Hash(),
Number: h.Number,
Time: h.Time,
}
case "eth_getBlockByHash":
val, ok := args[0].(common.Hash)
if !ok {
return errors.Errorf("wrong argument type provided: %T", args[0])
}
h, err := r.Backend.HeaderByHash(ctx, val)
if err != nil {
return err
}
assertedObj, ok := obj.(**types.HeaderInfo)
if !ok {
return errors.Errorf("wrong argument type provided: %T", obj)
}
*assertedObj = &types.HeaderInfo{
Hash: h.Hash(),
Number: h.Number,
Time: h.Time,
}
}
return nil
}
// BatchCall --
func (r *RPCClient) BatchCall(b []rpc.BatchElem) error {
if r.Backend == nil {
return nil
}
for _, e := range b {
num, err := hexutil.DecodeBig(e.Args[0].(string))
if err != nil {
return err
}
h, err := r.Backend.HeaderByNumber(context.Background(), num)
if err != nil {
return err
}
*e.Result.(*types.HeaderInfo) = types.HeaderInfo{Number: h.Number, Time: h.Time, Hash: h.Hash()}
}
return nil
}
// InsertBlock adds provided block info into the chain.
func (m *Chain) InsertBlock(height int, time uint64, hash []byte) *Chain {
m.HashesByHeight[height] = hash
m.TimesByHeight[height] = time
m.BlockNumberByTime[time] = big.NewInt(int64(height))
return m
}
func SetupRPCServer() (*rpc.Server, string, error) {
srv := rpc.NewServer()
if err := srv.RegisterName("eth", &testETHRPC{}); err != nil {
return nil, "", err
}
if err := srv.RegisterName("net", &testETHRPC{}); err != nil {
return nil, "", err
}
hs := httptest.NewUnstartedServer(srv)
hs.Start()
return srv, hs.URL, nil
}
type testETHRPC struct{}
func (*testETHRPC) NoArgsRets() {}
func (*testETHRPC) ChainId(_ context.Context) *hexutil.Big {
return (*hexutil.Big)(big.NewInt(int64(params.BeaconConfig().DepositChainID)))
}
func (*testETHRPC) Version(_ context.Context) string {
return fmt.Sprintf("%d", params.BeaconConfig().DepositNetworkID)
}