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package billing
import (
"context"
"errors"
"fmt"
"math"
"strings"
"github.com/jackc/pgx/v5"
)
func (s *Service) ListAccounts(ctx context.Context, tenantID string) ([]Account, error) {
query := `
SELECT t.id::text, t.name, COALESCE(w.currency, $1), COALESCE(w.balance_micros, 0),
COALESCE(w.reserved_micros, 0), COALESCE(w.balance_micros - w.reserved_micros, 0),
COALESCE(w.updated_at, t.created_at)
FROM tenants t LEFT JOIN tenant_wallets w ON w.tenant_id = t.id`
args := []any{s.currency}
if strings.TrimSpace(tenantID) != "" {
query += ` WHERE t.id=$2`
args = append(args, tenantID)
}
query += ` ORDER BY t.name`
rows, err := s.db.Query(ctx, query, args...)
if err != nil {
return nil, fmt.Errorf("query billing accounts: %w", err)
}
defer rows.Close()
result := make([]Account, 0)
for rows.Next() {
var item Account
if err := rows.Scan(&item.TenantID, &item.TenantName, &item.Currency, &item.BalanceMicros,
&item.ReservedMicros, &item.AvailableMicros, &item.UpdatedAt); err != nil {
return nil, fmt.Errorf("scan billing account: %w", err)
}
result = append(result, item)
}
return result, rows.Err()
}
func (s *Service) ListLedger(ctx context.Context, tenantID string, limit int) ([]LedgerEntry, error) {
if limit < 1 || limit > 500 {
limit = 200
}
query := `
SELECT id::text, tenant_id::text, COALESCE(project_id::text, ''), currency, amount_micros,
balance_after_micros, kind, source_type, source_id, description, created_at
FROM billing_ledger`
args := []any{}
if strings.TrimSpace(tenantID) != "" {
query += ` WHERE tenant_id = $1 ORDER BY created_at DESC LIMIT $2`
args = append(args, tenantID, limit)
} else {
query += ` ORDER BY created_at DESC LIMIT $1`
args = append(args, limit)
}
rows, err := s.db.Query(ctx, query, args...)
if err != nil {
return nil, fmt.Errorf("query billing ledger: %w", err)
}
defer rows.Close()
result := make([]LedgerEntry, 0)
for rows.Next() {
var item LedgerEntry
if err := rows.Scan(&item.ID, &item.TenantID, &item.ProjectID, &item.Currency, &item.AmountMicros,
&item.BalanceAfterMicros, &item.Kind, &item.SourceType, &item.SourceID,
&item.Description, &item.CreatedAt); err != nil {
return nil, fmt.Errorf("scan billing ledger: %w", err)
}
result = append(result, item)
}
return result, rows.Err()
}
func (s *Service) AdjustBalance(ctx context.Context, input AdjustmentInput) (LedgerEntry, error) {
input.TenantID = strings.TrimSpace(input.TenantID)
input.Description = normalizeDescription(input.Description)
if input.TenantID == "" || input.AmountMicros == 0 {
return LedgerEntry{}, ErrInvalidAmount
}
tx, err := s.db.BeginTx(ctx, pgx.TxOptions{IsoLevel: pgx.ReadCommitted})
if err != nil {
return LedgerEntry{}, fmt.Errorf("begin balance adjustment: %w", err)
}
defer tx.Rollback(ctx)
if _, err := tx.Exec(ctx, `
INSERT INTO tenant_wallets (tenant_id, currency) VALUES ($1, $2)
ON CONFLICT (tenant_id) DO NOTHING`, input.TenantID, s.currency); err != nil {
return LedgerEntry{}, fmt.Errorf("ensure adjustment wallet: %w", err)
}
var currency string
var balance, held int64
if err := tx.QueryRow(ctx, `SELECT currency, balance_micros, reserved_micros FROM tenant_wallets WHERE tenant_id = $1 FOR UPDATE`, input.TenantID).Scan(¤cy, &balance, &held); err != nil {
return LedgerEntry{}, fmt.Errorf("lock adjustment wallet: %w", err)
}
if currency != s.currency {
return LedgerEntry{}, fmt.Errorf("tenant wallet currency %s does not match %s", currency, s.currency)
}
if input.AmountMicros > 0 && balance > math.MaxInt64-input.AmountMicros {
return LedgerEntry{}, ErrInvalidAmount
}
newBalance := balance + input.AmountMicros
if newBalance < held || newBalance < 0 {
return LedgerEntry{}, ErrInsufficientBalance
}
if _, err := tx.Exec(ctx, `UPDATE tenant_wallets SET balance_micros = $2, updated_at = now() WHERE tenant_id = $1`, input.TenantID, newBalance); err != nil {
return LedgerEntry{}, fmt.Errorf("apply balance adjustment: %w", err)
}
sourceID := "adj_" + randomHex(16)
var result LedgerEntry
err = tx.QueryRow(ctx, `
INSERT INTO billing_ledger (tenant_id, currency, amount_micros, balance_after_micros, kind, source_type, source_id, description)
VALUES ($1,$2,$3,$4,'adjustment','admin',$5,$6)
RETURNING id::text, tenant_id::text, '', currency, amount_micros, balance_after_micros,
kind, source_type, source_id, description, created_at`,
input.TenantID, s.currency, input.AmountMicros, newBalance, sourceID, input.Description,
).Scan(&result.ID, &result.TenantID, &result.ProjectID, &result.Currency, &result.AmountMicros,
&result.BalanceAfterMicros, &result.Kind, &result.SourceType, &result.SourceID,
&result.Description, &result.CreatedAt)
if err != nil {
return LedgerEntry{}, fmt.Errorf("write adjustment ledger entry: %w", err)
}
if err := tx.Commit(ctx); err != nil {
return LedgerEntry{}, fmt.Errorf("commit balance adjustment: %w", err)
}
return result, nil
}
func (s *Service) createTopUpOrder(ctx context.Context, input CheckoutInput) (string, int64, error) {
if !s.stripeEnabled {
return "", 0, ErrStripeDisabled
}
if strings.TrimSpace(input.TenantID) == "" || input.AmountMinor < s.minTopUpMinor || input.AmountMinor > s.maxTopUpMinor {
return "", 0, ErrInvalidAmount
}
amountMicros, err := minorToMicros(s.currency, input.AmountMinor)
if err != nil {
return "", 0, err
}
var orderID string
err = s.db.QueryRow(ctx, `
INSERT INTO topup_orders (tenant_id, amount_minor, amount_micros, currency)
VALUES ($1,$2,$3,$4) RETURNING id::text`, input.TenantID, input.AmountMinor, amountMicros, s.currency,
).Scan(&orderID)
if err != nil {
return "", 0, fmt.Errorf("create top-up order: %w", err)
}
return orderID, amountMicros, nil
}
func minorToMicros(currency string, amount int64) (int64, error) {
if amount <= 0 {
return 0, ErrInvalidAmount
}
factor := int64(10_000)
switch strings.ToLower(currency) {
case "bif", "clp", "djf", "gnf", "jpy", "kmf", "krw", "mga", "pyg", "rwf", "ugx", "vnd", "vuv", "xaf", "xof", "xpf":
factor = 1_000_000
case "bhd", "jod", "kwd", "omr", "tnd":
factor = 1_000
}
if amount > math.MaxInt64/factor {
return 0, ErrInvalidAmount
}
return amount * factor, nil
}
func isNotFound(err error) bool {
return errors.Is(err, pgx.ErrNoRows)
}
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