From ded3110d384fc15326eacaa6aff2a385003458ea Mon Sep 17 00:00:00 2001
From: Lawliet-Chan <1576710154@qq.com>
Date: Wed, 15 May 2024 13:42:04 +0800
Subject: [PATCH] parse event l1Txn

---
 cairo/l1/eth_sub.go | 86 +++++++++++++++++++++++++++++++++++++++++++++
 cairo/l1/l1.go      | 23 ++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 cairo/l1/eth_sub.go
 create mode 100644 cairo/l1/l1.go

diff --git a/cairo/l1/eth_sub.go b/cairo/l1/eth_sub.go
new file mode 100644
index 0000000..c8727c2
--- /dev/null
+++ b/cairo/l1/eth_sub.go
@@ -0,0 +1,86 @@
+package l1
+
+import (
+	"context"
+	"fmt"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/event"
+	"github.com/ethereum/go-ethereum/rpc"
+	"itachi/cairo/l1/contract"
+	"math/big"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type EthSubscriber struct {
+	ethClient *ethclient.Client
+	client    *rpc.Client
+	filterer  *contract.StarknetFilterer
+}
+
+func NewEthSubscriber(ethClientAddress string, coreContractAddress common.Address) (*EthSubscriber, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+	// TODO replace with our own client once we have one.
+	// Geth pulls in a lot of dependencies that we don't use.
+	client, err := rpc.DialContext(ctx, ethClientAddress)
+	if err != nil {
+		return nil, err
+	}
+	ethClient := ethclient.NewClient(client)
+	filterer, err := contract.NewStarknetFilterer(coreContractAddress, ethClient)
+	if err != nil {
+		return nil, err
+	}
+	return &EthSubscriber{
+		ethClient: ethClient,
+		client:    client,
+		filterer:  filterer,
+	}, nil
+}
+
+func (s *EthSubscriber) WatchLogMessageToL2(
+	ctx context.Context,
+	sink chan<- *contract.StarknetLogMessageToL2,
+	fromAddress []common.Address,
+	toAddress []*big.Int,
+	selector []*big.Int,
+) (event.Subscription, error) {
+	return s.filterer.WatchLogMessageToL2(&bind.WatchOpts{Context: ctx}, sink, fromAddress, toAddress, selector)
+}
+
+func (s *EthSubscriber) ChainID(ctx context.Context) (*big.Int, error) {
+	return s.ethClient.ChainID(ctx)
+}
+
+func (s *EthSubscriber) FinalisedHeight(ctx context.Context) (uint64, error) {
+	finalisedBlock := make(map[string]any, 0)
+	if err := s.client.CallContext(ctx, &finalisedBlock, "eth_getBlockByNumber", "finalized", false); err != nil { //nolint:misspell
+		return 0, fmt.Errorf("get finalised Ethereum block: %w", err)
+	}
+
+	number, ok := finalisedBlock["number"] //nolint:gosec
+	if !ok {
+		return 0, fmt.Errorf("number field not present in Ethereum block")
+	}
+
+	numberString, ok := number.(string)
+	if !ok {
+		return 0, fmt.Errorf("block number is not a string: %v", number)
+	}
+
+	numberString = strings.TrimPrefix(numberString, "0x")
+	numberUint, err := strconv.ParseUint(numberString, 16, 64)
+	if err != nil {
+		return 0, fmt.Errorf("parse block number: %s", numberString)
+	}
+
+	return numberUint, nil
+}
+
+func (s *EthSubscriber) Close() {
+	s.ethClient.Close()
+}
diff --git a/cairo/l1/l1.go b/cairo/l1/l1.go
new file mode 100644
index 0000000..c83cc7f
--- /dev/null
+++ b/cairo/l1/l1.go
@@ -0,0 +1,23 @@
+package l1
+
+import (
+	"github.com/NethermindEth/juno/core"
+	"github.com/NethermindEth/juno/core/felt"
+	"itachi/cairo/l1/contract"
+)
+
+func parseEventToL1Txn(event *contract.StarknetLogMessageToL2) *core.L1HandlerTransaction {
+	callData := make([]*felt.Felt, 0)
+	callData = append(callData, new(felt.Felt).SetBigInt(event.FromAddress.Big()))
+	for _, payload := range event.Payload {
+		data := new(felt.Felt).SetBigInt(payload)
+		callData = append(callData, data)
+	}
+	return &core.L1HandlerTransaction{
+		ContractAddress:    new(felt.Felt).SetBigInt(event.ToAddress),
+		EntryPointSelector: new(felt.Felt).SetBigInt(event.Selector),
+		Nonce:              new(felt.Felt).SetBigInt(event.Nonce),
+		CallData:           callData,
+		Version:            new(core.TransactionVersion),
+	}
+}