ussd/common/vouchers.go

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package common
import (
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"context"
"fmt"
"math/big"
"strings"
"git.grassecon.net/urdt/ussd/internal/storage"
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dataserviceapi "github.com/grassrootseconomics/ussd-data-service/pkg/api"
)
// VoucherMetadata helps organize data fields
type VoucherMetadata struct {
Symbols string
Balances string
Decimals string
Addresses string
}
// ProcessVouchers converts holdings into formatted strings
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func ProcessVouchers(holdings []dataserviceapi.TokenHoldings) VoucherMetadata {
var data VoucherMetadata
var symbols, balances, decimals, addresses []string
for i, h := range holdings {
symbols = append(symbols, fmt.Sprintf("%d:%s", i+1, h.TokenSymbol))
// Scale down the balance
scaledBalance := ScaleDownBalance(h.Balance, h.TokenDecimals)
balances = append(balances, fmt.Sprintf("%d:%s", i+1, scaledBalance))
decimals = append(decimals, fmt.Sprintf("%d:%s", i+1, h.TokenDecimals))
addresses = append(addresses, fmt.Sprintf("%d:%s", i+1, h.ContractAddress))
}
data.Symbols = strings.Join(symbols, "\n")
data.Balances = strings.Join(balances, "\n")
data.Decimals = strings.Join(decimals, "\n")
data.Addresses = strings.Join(addresses, "\n")
return data
}
func ScaleDownBalance(balance, decimals string) string {
// Convert balance and decimals to big.Float
bal := new(big.Float)
bal.SetString(balance)
dec, ok := new(big.Int).SetString(decimals, 10)
if !ok {
dec = big.NewInt(0) // Default to 0 decimals in case of conversion failure
}
divisor := new(big.Float).SetInt(new(big.Int).Exp(big.NewInt(10), dec, nil))
scaledBalance := new(big.Float).Quo(bal, divisor)
// Return the scaled balance without trailing decimals if it's an integer
if scaledBalance.IsInt() {
return scaledBalance.Text('f', 0)
}
return scaledBalance.Text('f', -1)
}
// GetVoucherData retrieves and matches voucher data
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func GetVoucherData(ctx context.Context, db storage.PrefixDb, input string) (*dataserviceapi.TokenHoldings, error) {
keys := []string{"sym", "bal", "deci", "addr"}
data := make(map[string]string)
for _, key := range keys {
value, err := db.Get(ctx, []byte(key))
if err != nil {
return nil, fmt.Errorf("failed to get %s: %v", key, err)
}
data[key] = string(value)
}
symbol, balance, decimal, address := MatchVoucher(input,
data["sym"],
data["bal"],
data["deci"],
data["addr"])
if symbol == "" {
return nil, nil
}
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return &dataserviceapi.TokenHoldings{
TokenSymbol: string(symbol),
Balance: string(balance),
TokenDecimals: string(decimal),
ContractAddress: string(address),
}, nil
}
// MatchVoucher finds the matching voucher symbol, balance, decimals and contract address based on the input.
func MatchVoucher(input, symbols, balances, decimals, addresses string) (symbol, balance, decimal, address string) {
symList := strings.Split(symbols, "\n")
balList := strings.Split(balances, "\n")
decList := strings.Split(decimals, "\n")
addrList := strings.Split(addresses, "\n")
logg.Tracef("found", "symlist", symList, "syms", symbols, "input", input)
for i, sym := range symList {
parts := strings.SplitN(sym, ":", 2)
if input == parts[0] || strings.EqualFold(input, parts[1]) {
symbol = parts[1]
if i < len(balList) {
balance = strings.SplitN(balList[i], ":", 2)[1]
}
if i < len(decList) {
decimal = strings.SplitN(decList[i], ":", 2)[1]
}
if i < len(addrList) {
address = strings.SplitN(addrList[i], ":", 2)[1]
}
break
}
}
return
}
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// StoreTemporaryVoucher saves voucher metadata as temporary entries in the DataStore.
func StoreTemporaryVoucher(ctx context.Context, store DataStore, sessionId string, data *dataserviceapi.TokenHoldings) error {
tempData := fmt.Sprintf("%s,%s,%s,%s", data.TokenSymbol, data.Balance, data.TokenDecimals, data.ContractAddress)
if err := store.WriteEntry(ctx, sessionId, DATA_TEMPORARY_VALUE, []byte(tempData)); err != nil {
return err
}
return nil
}
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// GetTemporaryVoucherData retrieves temporary voucher metadata from the DataStore.
func GetTemporaryVoucherData(ctx context.Context, store DataStore, sessionId string) (*dataserviceapi.TokenHoldings, error) {
temp_data, err := store.ReadEntry(ctx, sessionId, DATA_TEMPORARY_VALUE)
if err != nil {
return nil, err
}
values := strings.SplitN(string(temp_data), ",", 4)
data := &dataserviceapi.TokenHoldings{}
data.TokenSymbol = values[0]
data.Balance = values[1]
data.TokenDecimals = values[2]
data.ContractAddress = values[3]
return data, nil
}
// UpdateVoucherData updates the active voucher data in the DataStore.
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func UpdateVoucherData(ctx context.Context, store DataStore, sessionId string, data *dataserviceapi.TokenHoldings) error {
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logg.TraceCtxf(ctx, "dtal", "data", data)
// Active voucher data entries
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activeEntries := map[DataTyp][]byte{
DATA_ACTIVE_SYM: []byte(data.TokenSymbol),
DATA_ACTIVE_BAL: []byte(data.Balance),
DATA_ACTIVE_DECIMAL: []byte(data.TokenDecimals),
DATA_ACTIVE_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
}