refactor: Decouple router and handlers (#31)

* refactor: decouple router to allow adding custom log and input data handlers

* feat: refactor handlers

* devops: update service build args

* chore: cleanup unecessary files/code

internal/handler/index_add.go

@@ -0,0 +1,89 @@
+package handler
+
+import (
+	"context"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/celo-tracker/pkg/router"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+const indexAddEventName = "INDEX_ADD"
+
+var (
+	indexAddEvent    = w3.MustNewEvent("AddressAdded(address _token)")
+	indexAddSig      = w3.MustNewFunc("add(address)", "bool")
+	indexRegisterSig = w3.MustNewFunc("register(address)", "bool")
+)
+
+func HandleIndexAddLog(hc *HandlerContainer) router.LogHandlerFunc {
+	return func(ctx context.Context, lp router.LogPayload, c router.Callback) error {
+		var address common.Address
+
+		if err := indexAddEvent.DecodeArgs(lp.Log, &address); err != nil {
+			return err
+		}
+
+		indexAddEvent := 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:          indexAddEventName,
+			Payload: map[string]any{
+				"address": address.Hex(),
+			},
+		}
+
+		if err := hc.cache.Add(ctx, address.Hex()); err != nil {
+			return err
+		}
+
+		return c(ctx, indexAddEvent)
+	}
+}
+
+func HandleIndexAddInputData() router.InputDataHandlerFunc {
+	return func(ctx context.Context, idp router.InputDataPayload, c router.Callback) error {
+		indexAddEvent := event.Event{
+			Block:           idp.Block,
+			ContractAddress: idp.ContractAddress,
+			Success:         false,
+			Timestamp:       idp.Timestamp,
+			TxHash:          idp.TxHash,
+			TxType:          indexAddEventName,
+		}
+
+		switch idp.InputData[:8] {
+		case "0a3b0a4f":
+			var address common.Address
+
+			indexAddEvent.Payload = map[string]any{
+				"address": address.Hex(),
+			}
+
+			if err := indexAddSig.DecodeArgs(w3.B(idp.InputData), &address); err != nil {
+				return err
+			}
+
+			return c(ctx, indexAddEvent)
+		case "4420e486":
+			var address common.Address
+
+			indexAddEvent.Payload = map[string]any{
+				"address": address.Hex(),
+			}
+
+			if err := indexRegisterSig.DecodeArgs(w3.B(idp.InputData), &address); err != nil {
+				return err
+			}
+
+			return c(ctx, indexAddEvent)
+		}
+
+		return nil
+	}
+}