feat: add limit set handler

internal/handler/limit_set.go

@@ -0,0 +1,95 @@
+package handler
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/grassrootseconomics/eth-tracker/pkg/event"
+	"github.com/grassrootseconomics/eth-tracker/pkg/router"
+	"github.com/lmittmann/w3"
+)
+
+const limitSetEventName = "LIMIT_SET"
+
+var (
+	limitSetEvent = w3.MustNewEvent("LimitSet(address indexed token, address indexed holder, uint256 value)")
+	limitSetSig   = w3.MustNewFunc("setLimitFor(address, address, uint256)", "")
+)
+
+func HandleLimitSetLog(hc *HandlerContainer) router.LogHandlerFunc {
+	return func(ctx context.Context, lp router.LogPayload, c router.Callback) error {
+		var (
+			token  common.Address
+			holder common.Address
+			value  big.Int
+		)
+
+		if err := limitSetEvent.DecodeArgs(lp.Log, &token, &holder, &value); err != nil {
+			return err
+		}
+
+		proceed, err := hc.checkWithinNetwork(ctx, lp.Log.Address.Hex(), token.Hex(), holder.Hex())
+		if err != nil {
+			return err
+		}
+		if !proceed {
+			return nil
+		}
+
+		limitSetEvent := event.Event{
+			Index:           lp.Log.Index,
+			Block:           lp.Log.BlockNumber,
+			ContractAddress: lp.Log.Address.Hex(),
+			Success:         true,
+			Timestamp:       lp.Timestamp,
+			TxHash:          lp.Log.TxHash.Hex(),
+			TxType:          limitSetEventName,
+			Payload: map[string]any{
+				"token":  token.Hex(),
+				"holder": holder.Hex(),
+				"value":  value.String(),
+			},
+		}
+
+		return c(ctx, limitSetEvent)
+	}
+}
+
+func HandleLimitSetInputData(hc *HandlerContainer) router.InputDataHandlerFunc {
+	return func(ctx context.Context, idp router.InputDataPayload, c router.Callback) error {
+		var (
+			token  common.Address
+			holder common.Address
+			value  big.Int
+		)
+
+		if err := limitSetSig.DecodeArgs(w3.B(idp.InputData), &token, &holder, &value); err != nil {
+			return err
+		}
+
+		proceed, err := hc.checkWithinNetwork(ctx, idp.ContractAddress, token.Hex(), holder.Hex())
+		if err != nil {
+			return err
+		}
+		if !proceed {
+			return nil
+		}
+
+		limitSetEvent := event.Event{
+			Block:           idp.Block,
+			ContractAddress: idp.ContractAddress,
+			Success:         false,
+			Timestamp:       idp.Timestamp,
+			TxHash:          idp.TxHash,
+			TxType:          limitSetEventName,
+			Payload: map[string]any{
+				"token":  token.Hex(),
+				"holder": holder.Hex(),
+				"value":  value.String(),
+			},
+		}
+
+		return c(ctx, limitSetEvent)
+	}
+}