From 3dcd3ac2c16daa975f38f5550ad9ce083a566979 Mon Sep 17 00:00:00 2001
From: Mohammed Sohail <sohailsameja@gmail.com>
Date: Tue, 15 Jul 2025 16:09:38 +0300
Subject: [PATCH] feat: add limit set handler

---
 cmd/service/router.go         |  2 +
 internal/handler/limit_set.go | 95 +++++++++++++++++++++++++++++++++++
 2 files changed, 97 insertions(+)
 create mode 100644 internal/handler/limit_set.go

diff --git a/cmd/service/router.go b/cmd/service/router.go
index 4baa3cf..8771226 100644
--- a/cmd/service/router.go
+++ b/cmd/service/router.go
@@ -27,6 +27,7 @@ func bootstrapEventRouter(cacheProvider cache.Cache, pubCB router.Callback) *rou
 	router.RegisterLogRoute(w3.H("0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"), handler.HandleTokenTransferLog(handlerContainer))
 	router.RegisterLogRoute(w3.H("0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925"), handler.HandleTokenApproveLog(handlerContainer))
 	router.RegisterLogRoute(w3.H("0x5f7542858008eeb041631f30e6109ae94b83a58e9a58261dd2c42c508850f939"), handler.HandleTokenTransferFromLog(handlerContainer))
+	router.RegisterLogRoute(w3.H("0x8aa6856e3197c997992720c057a925dff13f6893a75f1a7228a2d4eafe117b84"), handler.HandleLimitSetLog(handlerContainer))
 	router.RegisterLogRoute(w3.H("0x06526a30af2ff868c2686df12e95844d8ae300416bbec5d5ccc2d2f4afdb17a0"), handler.HandleQuoterUpdatedLog())
 
 	router.RegisterInputDataRoute("63e4bff4", handler.HandleFaucetGiveInputData())
@@ -45,6 +46,7 @@ func bootstrapEventRouter(cacheProvider cache.Cache, pubCB router.Callback) *rou
 	router.RegisterInputDataRoute("a9059cbb", handler.HandleTokenTransferInputData(handlerContainer))
 	router.RegisterInputDataRoute("23b872dd", handler.HandleTokenTransferInputData(handlerContainer))
 	router.RegisterInputDataRoute("095ea7b3", handler.HandleTokenApproveInputData(handlerContainer))
+	router.RegisterInputDataRoute("bdd55440", handler.HandleLimitSetInputData(handlerContainer))
 	router.RegisterInputDataRoute("f912c64b", handler.HandleQuoterUpdatedInputData())
 
 	return router
diff --git a/internal/handler/limit_set.go b/internal/handler/limit_set.go
new file mode 100644
index 0000000..270dc54
--- /dev/null
+++ b/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)
+	}
+}