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package repository
import (
"context"
"fmt"
"testing"
"time"
"github.com/Wei-Shaw/sub2api/internal/service"
"github.com/redis/go-redis/v9"
"github.com/stretchr/testify/require"
"github.com/stretchr/testify/suite"
)
type BillingCacheSuite struct {
IntegrationRedisSuite
}
func (s *BillingCacheSuite) TestUserBalance() {
tests := []struct {
name string
fn func(ctx context.Context, rdb *redis.Client, cache service.BillingCache)
}{
{
name: "missing_key_returns_redis_nil",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
_, err := cache.GetUserBalance(ctx, 1)
require.ErrorIs(s.T(), err, redis.Nil, "expected redis.Nil for missing balance key")
},
},
{
name: "deduct_on_nonexistent_is_noop",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(1)
balanceKey := fmt.Sprintf("%s%d", billingBalanceKeyPrefix, userID)
require.NoError(s.T(), cache.DeductUserBalance(ctx, userID, 1), "DeductUserBalance should not error")
_, err := rdb.Get(ctx, balanceKey).Result()
require.ErrorIs(s.T(), err, redis.Nil, "expected missing key after deduct on non-existent")
},
},
{
name: "set_and_get_with_ttl",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(2)
balanceKey := fmt.Sprintf("%s%d", billingBalanceKeyPrefix, userID)
require.NoError(s.T(), cache.SetUserBalance(ctx, userID, 10.5), "SetUserBalance")
got, err := cache.GetUserBalance(ctx, userID)
require.NoError(s.T(), err, "GetUserBalance")
require.Equal(s.T(), 10.5, got, "balance mismatch")
ttl, err := rdb.TTL(ctx, balanceKey).Result()
require.NoError(s.T(), err, "TTL")
s.AssertTTLWithin(ttl, 1*time.Second, billingCacheTTL)
},
},
{
name: "deduct_reduces_balance",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(3)
require.NoError(s.T(), cache.SetUserBalance(ctx, userID, 10.5), "SetUserBalance")
require.NoError(s.T(), cache.DeductUserBalance(ctx, userID, 2.25), "DeductUserBalance")
got, err := cache.GetUserBalance(ctx, userID)
require.NoError(s.T(), err, "GetUserBalance after deduct")
require.Equal(s.T(), 8.25, got, "deduct mismatch")
},
},
{
name: "invalidate_removes_key",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(100)
balanceKey := fmt.Sprintf("%s%d", billingBalanceKeyPrefix, userID)
require.NoError(s.T(), cache.SetUserBalance(ctx, userID, 50.0), "SetUserBalance")
exists, err := rdb.Exists(ctx, balanceKey).Result()
require.NoError(s.T(), err, "Exists")
require.Equal(s.T(), int64(1), exists, "expected balance key to exist")
require.NoError(s.T(), cache.InvalidateUserBalance(ctx, userID), "InvalidateUserBalance")
exists, err = rdb.Exists(ctx, balanceKey).Result()
require.NoError(s.T(), err, "Exists after invalidate")
require.Equal(s.T(), int64(0), exists, "expected balance key to be removed after invalidate")
_, err = cache.GetUserBalance(ctx, userID)
require.ErrorIs(s.T(), err, redis.Nil, "expected redis.Nil after invalidate")
},
},
{
name: "deduct_refreshes_ttl",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(103)
balanceKey := fmt.Sprintf("%s%d", billingBalanceKeyPrefix, userID)
require.NoError(s.T(), cache.SetUserBalance(ctx, userID, 100.0), "SetUserBalance")
ttl1, err := rdb.TTL(ctx, balanceKey).Result()
require.NoError(s.T(), err, "TTL before deduct")
s.AssertTTLWithin(ttl1, 1*time.Second, billingCacheTTL)
require.NoError(s.T(), cache.DeductUserBalance(ctx, userID, 25.0), "DeductUserBalance")
balance, err := cache.GetUserBalance(ctx, userID)
require.NoError(s.T(), err, "GetUserBalance")
require.Equal(s.T(), 75.0, balance, "expected balance 75.0")
ttl2, err := rdb.TTL(ctx, balanceKey).Result()
require.NoError(s.T(), err, "TTL after deduct")
s.AssertTTLWithin(ttl2, 1*time.Second, billingCacheTTL)
},
},
}
for _, tt := range tests {
s.Run(tt.name, func() {
rdb := testRedis(s.T())
cache := NewBillingCache(rdb)
ctx := context.Background()
tt.fn(ctx, rdb, cache)
})
}
}
func (s *BillingCacheSuite) TestSubscriptionCache() {
tests := []struct {
name string
fn func(ctx context.Context, rdb *redis.Client, cache service.BillingCache)
}{
{
name: "missing_key_returns_redis_nil",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(10)
groupID := int64(20)
_, err := cache.GetSubscriptionCache(ctx, userID, groupID)
require.ErrorIs(s.T(), err, redis.Nil, "expected redis.Nil for missing subscription key")
},
},
{
name: "update_usage_on_nonexistent_is_noop",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(11)
groupID := int64(21)
subKey := fmt.Sprintf("%s%d:%d", billingSubKeyPrefix, userID, groupID)
require.NoError(s.T(), cache.UpdateSubscriptionUsage(ctx, userID, groupID, 1.0), "UpdateSubscriptionUsage should not error")
exists, err := rdb.Exists(ctx, subKey).Result()
require.NoError(s.T(), err, "Exists")
require.Equal(s.T(), int64(0), exists, "expected missing subscription key after UpdateSubscriptionUsage on non-existent")
},
},
{
name: "set_and_get_with_ttl",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(12)
groupID := int64(22)
subKey := fmt.Sprintf("%s%d:%d", billingSubKeyPrefix, userID, groupID)
data := &service.SubscriptionCacheData{
Status: "active",
ExpiresAt: time.Now().Add(1 * time.Hour),
DailyUsage: 1.0,
WeeklyUsage: 2.0,
MonthlyUsage: 3.0,
Version: 7,
}
require.NoError(s.T(), cache.SetSubscriptionCache(ctx, userID, groupID, data), "SetSubscriptionCache")
gotSub, err := cache.GetSubscriptionCache(ctx, userID, groupID)
require.NoError(s.T(), err, "GetSubscriptionCache")
require.Equal(s.T(), "active", gotSub.Status)
require.Equal(s.T(), int64(7), gotSub.Version)
require.Equal(s.T(), 1.0, gotSub.DailyUsage)
ttl, err := rdb.TTL(ctx, subKey).Result()
require.NoError(s.T(), err, "TTL subKey")
s.AssertTTLWithin(ttl, 1*time.Second, billingCacheTTL)
},
},
{
name: "update_usage_increments_all_fields",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(13)
groupID := int64(23)
data := &service.SubscriptionCacheData{
Status: "active",
ExpiresAt: time.Now().Add(1 * time.Hour),
DailyUsage: 1.0,
WeeklyUsage: 2.0,
MonthlyUsage: 3.0,
Version: 1,
}
require.NoError(s.T(), cache.SetSubscriptionCache(ctx, userID, groupID, data), "SetSubscriptionCache")
require.NoError(s.T(), cache.UpdateSubscriptionUsage(ctx, userID, groupID, 0.5), "UpdateSubscriptionUsage")
gotSub, err := cache.GetSubscriptionCache(ctx, userID, groupID)
require.NoError(s.T(), err, "GetSubscriptionCache after update")
require.Equal(s.T(), 1.5, gotSub.DailyUsage)
require.Equal(s.T(), 2.5, gotSub.WeeklyUsage)
require.Equal(s.T(), 3.5, gotSub.MonthlyUsage)
},
},
{
name: "invalidate_removes_key",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(101)
groupID := int64(10)
subKey := fmt.Sprintf("%s%d:%d", billingSubKeyPrefix, userID, groupID)
data := &service.SubscriptionCacheData{
Status: "active",
ExpiresAt: time.Now().Add(1 * time.Hour),
DailyUsage: 1.0,
WeeklyUsage: 2.0,
MonthlyUsage: 3.0,
Version: 1,
}
require.NoError(s.T(), cache.SetSubscriptionCache(ctx, userID, groupID, data), "SetSubscriptionCache")
exists, err := rdb.Exists(ctx, subKey).Result()
require.NoError(s.T(), err, "Exists")
require.Equal(s.T(), int64(1), exists, "expected subscription key to exist")
require.NoError(s.T(), cache.InvalidateSubscriptionCache(ctx, userID, groupID), "InvalidateSubscriptionCache")
exists, err = rdb.Exists(ctx, subKey).Result()
require.NoError(s.T(), err, "Exists after invalidate")
require.Equal(s.T(), int64(0), exists, "expected subscription key to be removed after invalidate")
_, err = cache.GetSubscriptionCache(ctx, userID, groupID)
require.ErrorIs(s.T(), err, redis.Nil, "expected redis.Nil after invalidate")
},
},
{
name: "missing_status_returns_parsing_error",
fn: func(ctx context.Context, rdb *redis.Client, cache service.BillingCache) {
userID := int64(102)
groupID := int64(11)
subKey := fmt.Sprintf("%s%d:%d", billingSubKeyPrefix, userID, groupID)
fields := map[string]any{
"expires_at": time.Now().Add(1 * time.Hour).Unix(),
"daily_usage": 1.0,
"weekly_usage": 2.0,
"monthly_usage": 3.0,
"version": 1,
}
require.NoError(s.T(), rdb.HSet(ctx, subKey, fields).Err(), "HSet")
_, err := cache.GetSubscriptionCache(ctx, userID, groupID)
require.Error(s.T(), err, "expected error for missing status field")
require.NotErrorIs(s.T(), err, redis.Nil, "expected parsing error, not redis.Nil")
require.Equal(s.T(), "invalid cache: missing status", err.Error())
},
},
}
for _, tt := range tests {
s.Run(tt.name, func() {
rdb := testRedis(s.T())
cache := NewBillingCache(rdb)
ctx := context.Background()
tt.fn(ctx, rdb, cache)
})
}
}
// TestDeductUserBalance_ErrorPropagation 验证 P2-12 修复：
// Redis 真实错误应传播，key 不存在（redis.Nil）应返回 nil。
func (s *BillingCacheSuite) TestDeductUserBalance_ErrorPropagation() {
tests := []struct {
name string
fn func(ctx context.Context, cache service.BillingCache)
expectErr bool
}{
{
name: "key_not_exists_returns_nil",
fn: func(ctx context.Context, cache service.BillingCache) {
// key 不存在时，Lua 脚本返回 0（redis.Nil），应返回 nil 而非错误
err := cache.DeductUserBalance(ctx, 99999, 1.0)
require.NoError(s.T(), err, "DeductUserBalance on non-existent key should return nil")
},
},
{
name: "existing_key_deducts_successfully",
fn: func(ctx context.Context, cache service.BillingCache) {
require.NoError(s.T(), cache.SetUserBalance(ctx, 200, 50.0))
err := cache.DeductUserBalance(ctx, 200, 10.0)
require.NoError(s.T(), err, "DeductUserBalance should succeed")
bal, err := cache.GetUserBalance(ctx, 200)
require.NoError(s.T(), err)
require.Equal(s.T(), 40.0, bal, "余额应为 40.0")
},
},
{
name: "cancelled_context_propagates_error",
fn: func(ctx context.Context, cache service.BillingCache) {
require.NoError(s.T(), cache.SetUserBalance(ctx, 201, 50.0))
cancelCtx, cancel := context.WithCancel(ctx)
cancel() // 立即取消
err := cache.DeductUserBalance(cancelCtx, 201, 10.0)
require.Error(s.T(), err, "cancelled context should propagate error")
},
},
}
for _, tt := range tests {
s.Run(tt.name, func() {
rdb := testRedis(s.T())
cache := NewBillingCache(rdb)
ctx := context.Background()
tt.fn(ctx, cache)
})
}
}
// TestUpdateSubscriptionUsage_ErrorPropagation 验证 P2-12 修复：
// Redis 真实错误应传播，key 不存在（redis.Nil）应返回 nil。
func (s *BillingCacheSuite) TestUpdateSubscriptionUsage_ErrorPropagation() {
s.Run("key_not_exists_returns_nil", func() {
rdb := testRedis(s.T())
cache := NewBillingCache(rdb)
ctx := context.Background()
err := cache.UpdateSubscriptionUsage(ctx, 88888, 77777, 1.0)
require.NoError(s.T(), err, "UpdateSubscriptionUsage on non-existent key should return nil")
})
s.Run("cancelled_context_propagates_error", func() {
rdb := testRedis(s.T())
cache := NewBillingCache(rdb)
ctx := context.Background()
data := &service.SubscriptionCacheData{
Status: "active",
ExpiresAt: time.Now().Add(1 * time.Hour),
Version: 1,
}
require.NoError(s.T(), cache.SetSubscriptionCache(ctx, 301, 401, data))
cancelCtx, cancel := context.WithCancel(ctx)
cancel()
err := cache.UpdateSubscriptionUsage(cancelCtx, 301, 401, 1.0)
require.Error(s.T(), err, "cancelled context should propagate error")
})
}
func TestBillingCacheSuite(t *testing.T) {
suite.Run(t, new(BillingCacheSuite))
}
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