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premium.go
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premium.go
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package premium
import (
"context"
"database/sql"
"github.com/jonas747/yagpdb/common"
"github.com/jonas747/yagpdb/premium/models"
"github.com/mediocregopher/radix.v3"
"github.com/pkg/errors"
"github.com/volatiletech/null"
"github.com/volatiletech/sqlboiler/boil"
"github.com/volatiletech/sqlboiler/queries/qm"
"time"
)
const (
// Hash
// Key: guild id's
// Value: the user id's providing the premium status
RedisKeyPremiumGuilds = "premium_activated_guilds"
RedisKeyPremiumGuildsTmp = "premium_activated_guilds_tmp"
)
type Plugin struct {
}
func (p *Plugin) Name() string {
return "premium"
}
func RegisterPlugin() {
common.RegisterPlugin(&Plugin{})
for _, v := range PremiumSources {
v.Init()
}
}
// IsGuildPremium return true if the provided guild has the premium status provided to it by a user
func IsGuildPremium(guildID int64) (bool, error) {
var premium bool
err := common.RedisPool.Do(radix.FlatCmd(&premium, "HEXISTS", RedisKeyPremiumGuilds, guildID))
return premium, errors.WithMessage(err, "IsGuildPremium")
}
// UserPremiumSlots returns all slots for a user
func UserPremiumSlots(ctx context.Context, userID int64) (slots []*models.PremiumSlot, err error) {
slots, err = models.PremiumSlots(qm.Where("user_id = ?", userID), qm.OrderBy("id desc")).AllG(ctx)
return
}
var (
PremiumSources []PremiumSource
ErrSlotNotFound = errors.New("premium slot not found")
ErrGuildAlreadyPremium = errors.New("guild already assigned premium from another slot")
)
type PremiumSource interface {
Init()
Names() (human string, idname string)
}
func RegisterPremiumSource(source PremiumSource) {
PremiumSources = append(PremiumSources, source)
}
func SlotExpired(ctx context.Context, slot *models.PremiumSlot) error {
err := DetachSlotFromGuild(ctx, slot.ID, slot.UserID)
if err != nil {
return errors.WithMessage(err, "Detach")
}
// Attempt migrating the guild attached to the epxired slot to the next available slot the owner of the slot has
tx, err := common.PQ.BeginTx(ctx, nil)
if err != nil {
return errors.WithMessage(err, "BeginTX")
}
availableSlot, err := models.PremiumSlots(qm.Where("user_id = ? AND guild_id IS NULL and permanent = true", slot.UserID), qm.For("UPDATE")).One(ctx, tx)
if err != nil {
tx.Rollback()
// If there's no available slots to migrate the guild to, not much can be done
if errors.Cause(err) == sql.ErrNoRows {
return nil
}
return errors.WithMessage(err, "models.PremiumSlots")
}
availableSlot.AttachedAt = null.TimeFrom(time.Now())
availableSlot.GuildID = slot.GuildID
_, err = availableSlot.Update(ctx, tx, boil.Whitelist("attached_at", "guild_id"))
if err != nil {
tx.Rollback()
return errors.WithMessage(err, "Update")
}
err = tx.Commit()
if err != nil {
return errors.WithMessage(err, "Commit")
}
err = common.RedisPool.Do(radix.FlatCmd(nil, "HSET", RedisKeyPremiumGuilds, slot.GuildID.Int64, slot.UserID))
return errors.WithMessage(err, "HSET")
}
// RemovePremiumSlots removes the specifues premium slots and attempts to migrate to other permanent available ones
// THIS SHOULD BE USED INSIDE A TRANSACTION ONLY, AS OTHERWISE RACE CONDITIONS BE UPON THEE
func RemovePremiumSlots(ctx context.Context, exec boil.ContextExecutor, userID int64, slotsToRemove []int64) error {
userSlots, err := models.PremiumSlots(qm.Where("user_id = ?", userID), qm.OrderBy("id desc"), qm.For("UPDATE")).All(ctx, exec)
if err != nil {
return errors.WithMessage(err, "models.PremiumSlots")
}
// Find the remainign free slots after the removal of the specified slots
remainingFreeSlots := make([]*models.PremiumSlot, 0)
for _, slot := range userSlots {
if slot.GuildID.Valid || !slot.Permanent || SlotDurationLeft(slot) <= 0 {
continue
}
for _, v := range slotsToRemove {
if v == slot.ID {
continue
}
}
remainingFreeSlots = append(remainingFreeSlots, slot)
}
freeSlotsUsed := 0
// Do the removal and migration
for _, removing := range slotsToRemove {
// Find the model first
var slot *models.PremiumSlot
for _, v := range userSlots {
if v.ID == removing {
slot = v
break
}
}
if slot == nil {
continue
}
if slot.GuildID.Valid && freeSlotsUsed < len(remainingFreeSlots) {
// We can migrate it
remainingFreeSlots[freeSlotsUsed].GuildID = slot.GuildID
remainingFreeSlots[freeSlotsUsed].AttachedAt = null.TimeFrom(time.Now())
freeSlotsUsed++
}
_, err = slot.Delete(ctx, exec)
if err != nil {
return errors.WithMessage(err, "slot.Delete")
}
}
// Update all the slots we migrated to
for i := 0; i < freeSlotsUsed; i++ {
_, err = remainingFreeSlots[i].Update(ctx, exec, boil.Whitelist("guild_id", "attached_at"))
if err != nil {
return errors.WithMessage(err, "remainingFreeSlots.Update")
}
}
return nil
}
func CreatePremiumSlot(ctx context.Context, exec boil.ContextExecutor, userID int64, source, title, message string, sourceSlotID int64, duration time.Duration) (*models.PremiumSlot, error) {
slot := &models.PremiumSlot{
UserID: userID,
Source: source,
SourceID: sourceSlotID,
Title: title,
Message: message,
FullDuration: int64(duration),
Permanent: duration <= 0,
DurationRemaining: int64(duration),
}
err := slot.Insert(ctx, exec, boil.Infer())
return slot, err
}
func FindSource(sourceID string) PremiumSource {
for _, v := range PremiumSources {
if _, id := v.Names(); id == sourceID {
return v
}
}
return nil
}
func SlotDurationLeft(slot *models.PremiumSlot) (duration time.Duration) {
if slot.Permanent {
return 0xfffffffffffffff
}
duration = time.Duration(slot.DurationRemaining)
if slot.GuildID.Valid {
duration -= time.Since(slot.AttachedAt.Time)
}
return duration
}
func AttachSlotToGuild(ctx context.Context, slotID int64, userID int64, guildID int64) error {
tx, err := common.PQ.BeginTx(ctx, nil)
if err != nil {
return errors.WithMessage(err, "BeginTX")
}
_, err = tx.Exec("LOCK TABLE premium_slots IN EXCLUSIVE MODE")
if err != nil {
tx.Rollback()
return errors.WithMessage(err, "Lock")
}
// Check if this guild is used in another slot
n, err := models.PremiumSlots(qm.Where("guild_id = ?", guildID)).Count(ctx, tx)
if err != nil {
tx.Rollback()
return errors.WithMessage(err, "PremiumSlots.Count")
}
if n > 0 {
tx.Rollback()
return ErrGuildAlreadyPremium
}
n, err = models.PremiumSlots(qm.Where("id = ? AND user_id = ? AND guild_id IS NULL AND (permanent OR duration_remaining > 0)", slotID, userID)).UpdateAll(
ctx, tx, models.M{"guild_id": null.Int64From(guildID), "attached_at": time.Now()})
if err != nil {
tx.Rollback()
return errors.WithMessage(err, "UpdateAll")
}
if n < 1 {
tx.Rollback()
return ErrSlotNotFound
}
err = tx.Commit()
if err != nil {
tx.Rollback()
return errors.WithMessage(err, "Commit")
}
err = common.RedisPool.Do(radix.FlatCmd(nil, "HSET", RedisKeyPremiumGuilds, guildID, userID))
return errors.WithMessage(err, "Hset.RedisKeyPremiumGuilds")
}
func DetachSlotFromGuild(ctx context.Context, slotID int64, userID int64) error {
tx, err := common.PQ.BeginTx(ctx, nil)
if err != nil {
return errors.WithMessage(err, "BeginTX")
}
slot, err := models.PremiumSlots(qm.Where("id = ? AND user_id = ?", slotID, userID), qm.For("UPDATE")).One(ctx, tx)
if err != nil {
tx.Rollback()
return errors.WithMessage(err, "PremiumSlots.One")
}
if slot == nil {
tx.Rollback()
return ErrSlotNotFound
}
oldGuildID := slot.GuildID.Int64
// Update the duration before we reset the guild_id to null
slot.DurationRemaining = int64(SlotDurationLeft(slot))
slot.GuildID = null.Int64{}
slot.AttachedAt = null.Time{}
_, err = slot.Update(ctx, tx, boil.Infer())
if err != nil {
tx.Rollback()
return errors.WithMessage(err, "Update")
}
err = tx.Commit()
if err != nil {
errors.WithMessage(err, "Commit")
}
err = common.RedisPool.Do(radix.FlatCmd(nil, "HDEL", RedisKeyPremiumGuilds, oldGuildID))
return errors.WithMessage(err, "HDEL.RedisKeyPremiumGuilds")
}