added helper functions to process the swap to and swap from voucher data

store/swap_from_vouchers.go

@@ -0,0 +1,65 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	storedb "git.grassecon.net/grassrootseconomics/sarafu-vise/store/db"
+	dataserviceapi "github.com/grassrootseconomics/ussd-data-service/pkg/api"
+)
+
+// GetSwapFromVoucherData retrieves and matches swap from voucher data
+func GetSwapFromVoucherData(ctx context.Context, db storedb.PrefixDb, input string) (*dataserviceapi.TokenHoldings, error) {
+	keys := []storedb.DataTyp{
+		storedb.DATA_POOL_FROM_SYMBOLS,
+		storedb.DATA_POOL_FROM_BALANCES,
+		storedb.DATA_POOL_FROM_DECIMALS,
+		storedb.DATA_POOL_FROM_ADDRESSES,
+	}
+	data := make(map[storedb.DataTyp]string)
+
+	for _, key := range keys {
+		value, err := db.Get(ctx, storedb.ToBytes(key))
+		if err != nil {
+			return nil, fmt.Errorf("failed to get prefix key %x: %v", storedb.ToBytes(key), err)
+		}
+		data[key] = string(value)
+	}
+
+	symbol, balance, decimal, address := MatchVoucher(input,
+		data[storedb.DATA_POOL_FROM_SYMBOLS],
+		data[storedb.DATA_POOL_FROM_BALANCES],
+		data[storedb.DATA_POOL_FROM_DECIMALS],
+		data[storedb.DATA_POOL_FROM_ADDRESSES],
+	)
+
+	if symbol == "" {
+		return nil, nil
+	}
+
+	return &dataserviceapi.TokenHoldings{
+		TokenSymbol:     string(symbol),
+		Balance:         string(balance),
+		TokenDecimals:   string(decimal),
+		ContractAddress: string(address),
+	}, nil
+}
+
+// UpdateSwapFromVoucherData updates the active swap to voucher data in the DataStore.
+func UpdateSwapFromVoucherData(ctx context.Context, store DataStore, sessionId string, data *dataserviceapi.TokenHoldings) error {
+	logg.TraceCtxf(ctx, "dtal", "data", data)
+	// Active swap from voucher data entries
+	activeEntries := map[storedb.DataTyp][]byte{
+		storedb.DATA_ACTIVE_SWAP_FROM_SYM: []byte(data.TokenSymbol),
+		storedb.DATA_ACTIVE_SWAP_FROM_DECIMAL: []byte(data.TokenDecimals),
+		storedb.DATA_ACTIVE_SWAP_FROM_ADDRESS: []byte(data.ContractAddress),
+	}
+
+	// Write active data
+	for key, value := range activeEntries {
+		if err := store.WriteEntry(ctx, sessionId, key, value); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

store/swap_to_vouchers.go

@@ -0,0 +1,65 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	storedb "git.grassecon.net/grassrootseconomics/sarafu-vise/store/db"
+	dataserviceapi "github.com/grassrootseconomics/ussd-data-service/pkg/api"
+)
+
+// GetSwapToVoucherData retrieves and matches voucher data
+func GetSwapToVoucherData(ctx context.Context, db storedb.PrefixDb, input string) (*dataserviceapi.TokenHoldings, error) {
+	keys := []storedb.DataTyp{
+		storedb.DATA_POOL_TO_SYMBOLS,
+		storedb.DATA_POOL_TO_BALANCES,
+		storedb.DATA_POOL_TO_DECIMALS,
+		storedb.DATA_POOL_TO_ADDRESSES,
+	}
+	data := make(map[storedb.DataTyp]string)
+
+	for _, key := range keys {
+		value, err := db.Get(ctx, storedb.ToBytes(key))
+		if err != nil {
+			return nil, fmt.Errorf("failed to get prefix key %x: %v", storedb.ToBytes(key), err)
+		}
+		data[key] = string(value)
+	}
+
+	symbol, balance, decimal, address := MatchVoucher(input,
+		data[storedb.DATA_POOL_TO_SYMBOLS],
+		data[storedb.DATA_POOL_TO_BALANCES],
+		data[storedb.DATA_POOL_TO_DECIMALS],
+		data[storedb.DATA_POOL_TO_ADDRESSES],
+	)
+
+	if symbol == "" {
+		return nil, nil
+	}
+
+	return &dataserviceapi.TokenHoldings{
+		TokenSymbol:     string(symbol),
+		Balance:         string(balance),
+		TokenDecimals:   string(decimal),
+		ContractAddress: string(address),
+	}, nil
+}
+
+// UpdateSwapToVoucherData updates the active swap to voucher data in the DataStore.
+func UpdateSwapToVoucherData(ctx context.Context, store DataStore, sessionId string, data *dataserviceapi.TokenHoldings) error {
+	logg.TraceCtxf(ctx, "dtal", "data", data)
+	// Active swap to voucher data entries
+	activeEntries := map[storedb.DataTyp][]byte{
+		storedb.DATA_ACTIVE_SWAP_TO_SYM: []byte(data.TokenSymbol),
+		storedb.DATA_ACTIVE_SWAP_TO_DECIMAL: []byte(data.TokenDecimals),
+		storedb.DATA_ACTIVE_SWAP_TO_ADDRESS: []byte(data.ContractAddress),
+	}
+
+	// Write active data
+	for key, value := range activeEntries {
+		if err := store.WriteEntry(ctx, sessionId, key, value); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}