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package backend
import (
"context"
"errors"
"fmt"
"io"
"sync/atomic"
"time"
"github.com/ethereum-optimism/optimism/op-service/client"
"github.com/ethereum-optimism/optimism/op-service/dial"
"github.com/ethereum-optimism/optimism/op-supervisor/config"
"github.com/ethereum-optimism/optimism/op-supervisor/supervisor/backend/db"
"github.com/ethereum-optimism/optimism/op-supervisor/supervisor/backend/source"
"github.com/ethereum-optimism/optimism/op-supervisor/supervisor/frontend"
"github.com/ethereum-optimism/optimism/op-supervisor/supervisor/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/log"
)
type LogStore interface {
io.Closer
ClosestBlockInfo(blockNum uint64) (uint64, db.TruncatedHash, error)
Rewind(headBlockNum uint64) error
}
type SupervisorBackend struct {
started atomic.Bool
logger log.Logger
chainMonitors []*source.ChainMonitor
logDBs []LogStore
}
var _ frontend.Backend = (*SupervisorBackend)(nil)
var _ io.Closer = (*SupervisorBackend)(nil)
func NewSupervisorBackend(ctx context.Context, logger log.Logger, m Metrics, cfg *config.Config) (*SupervisorBackend, error) {
chainMonitors := make([]*source.ChainMonitor, len(cfg.L2RPCs))
logDBs := make([]LogStore, len(cfg.L2RPCs))
for i, rpc := range cfg.L2RPCs {
rpcClient, chainID, err := createRpcClient(ctx, logger, rpc)
if err != nil {
return nil, err
}
cm := newChainMetrics(chainID, m)
path, err := prepLogDBPath(chainID, cfg.Datadir)
if err != nil {
return nil, fmt.Errorf("failed to create datadir for chain %v: %w", chainID, err)
}
logDB, err := db.NewFromFile(logger, cm, path)
if err != nil {
return nil, fmt.Errorf("failed to create logdb for chain %v at %v: %w", chainID, path, err)
}
logDBs[i] = logDB
block, err := Resume(logDB)
if err != nil {
return nil, err
}
monitor, err := source.NewChainMonitor(ctx, logger, cm, chainID, rpc, rpcClient, logDB, block)
if err != nil {
return nil, fmt.Errorf("failed to create monitor for rpc %v: %w", rpc, err)
}
chainMonitors[i] = monitor
}
return &SupervisorBackend{
logger: logger,
chainMonitors: chainMonitors,
logDBs: logDBs,
}, nil
}
func createRpcClient(ctx context.Context, logger log.Logger, rpc string) (client.RPC, types.ChainID, error) {
ethClient, err := dial.DialEthClientWithTimeout(ctx, 10*time.Second, logger, rpc)
if err != nil {
return nil, types.ChainID{}, fmt.Errorf("failed to connect to rpc %v: %w", rpc, err)
}
chainID, err := ethClient.ChainID(ctx)
if err != nil {
return nil, types.ChainID{}, fmt.Errorf("failed to load chain id for rpc %v: %w", rpc, err)
}
return client.NewBaseRPCClient(ethClient.Client()), types.ChainIDFromBig(chainID), nil
}
func (su *SupervisorBackend) Start(ctx context.Context) error {
if !su.started.CompareAndSwap(false, true) {
return errors.New("already started")
}
for _, monitor := range su.chainMonitors {
if err := monitor.Start(); err != nil {
return fmt.Errorf("failed to start chain monitor: %w", err)
}
}
return nil
}
func (su *SupervisorBackend) Stop(ctx context.Context) error {
if !su.started.CompareAndSwap(true, false) {
return errors.New("already stopped")
}
var errs error
for _, monitor := range su.chainMonitors {
if err := monitor.Stop(); err != nil {
errs = errors.Join(errs, fmt.Errorf("failed to stop chain monitor: %w", err))
}
}
for _, logDB := range su.logDBs {
if err := logDB.Close(); err != nil {
errs = errors.Join(errs, fmt.Errorf("failed to close logdb: %w", err))
}
}
return errs
}
func (su *SupervisorBackend) Close() error {
// TODO(protocol-quest#288): close logdb of all chains
return nil
}
func (su *SupervisorBackend) CheckMessage(identifier types.Identifier, payloadHash common.Hash) (types.SafetyLevel, error) {
// TODO(protocol-quest#288): hook up to logdb lookup
return types.CrossUnsafe, nil
}
func (su *SupervisorBackend) CheckBlock(chainID *hexutil.U256, blockHash common.Hash, blockNumber hexutil.Uint64) (types.SafetyLevel, error) {
// TODO(protocol-quest#288): hook up to logdb lookup
return types.CrossUnsafe, nil
}