Add TBTCSystem event log

pkg/chain/ethereum/gen/eventlog/TBTCSystemEventLog.go

@@ -0,0 +1,81 @@
+package eventlog
+
+import (
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	abi "github.com/keep-network/tbtc/pkg/chain/ethereum/gen/abi/system"
+	"math/big"
+)
+
+// FIXME: This is a temporary structure allowing to access past events
+//  emitted by the `TBTCSystem` contract. This structure is here because
+//  the generated contract wrappers from `gen/contract` don't support
+//  `Filter*` methods yet. When the contract generator will support
+//  those methods, the below structure can be removed.
+type TBTCSystemEventLog struct {
+	contract *abi.TBTCSystem
+}
+
+func NewTBTCSystemEventLog(
+	contractAddress common.Address,
+	backend bind.ContractBackend,
+) (*TBTCSystemEventLog, error) {
+	contract, err := abi.NewTBTCSystem(contractAddress, backend)
+	if err != nil {
+		return nil, err
+	}
+
+	return &TBTCSystemEventLog{contract}, nil
+}
+
+type TBTCSystemRedemptionRequested struct {
+	DepositContractAddress common.Address
+	Requester              common.Address
+	Digest                 [32]byte
+	UtxoValue              *big.Int
+	RedeemerOutputScript   []byte
+	RequestedFee           *big.Int
+	Outpoint               []byte
+	BlockNumber            uint64
+}
+
+func (tsel *TBTCSystemEventLog) PastRedemptionRequestedEvents(
+	depositsAddresses []common.Address,
+	startBlock uint64,
+	endBlock *uint64,
+) ([]*TBTCSystemRedemptionRequested, error) {
+	iterator, err := tsel.contract.FilterRedemptionRequested(
+		&bind.FilterOpts{
+			Start: startBlock,
+			End:   endBlock,
+		},
+		depositsAddresses,
+		nil,
+		nil,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	events := make([]*TBTCSystemRedemptionRequested, 0)
+
+	for {
+		if !iterator.Next() {
+			break
+		}
+
+		event := iterator.Event
+		events = append(events, &TBTCSystemRedemptionRequested{
+			DepositContractAddress: event.DepositContractAddress,
+			Requester:              event.Requester,
+			Digest:                 event.Digest,
+			UtxoValue:              event.UtxoValue,
+			RedeemerOutputScript:   event.RedeemerOutputScript,
+			RequestedFee:           event.RequestedFee,
+			Outpoint:               event.Outpoint,
+			BlockNumber:            event.Raw.BlockNumber,
+		})
+	}
+
+	return events, nil
+}