303 lines
7.9 KiB
Go
303 lines
7.9 KiB
Go
package redisstore
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import (
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"context"
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"errors"
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"fmt"
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"github.com/redis/go-redis/v9"
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"telesrv/internal/store"
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)
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// PtsAllocator 用 Redis INCR 分配账号级 pts，Redis 丢失时从 PG durable log 恢复当前最大 pts。
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type PtsAllocator struct {
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counter counterAllocator
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}
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// BoxIDAllocator 用 Redis INCR 分配 owner 视角的 message box id。
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type BoxIDAllocator struct {
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counter counterAllocator
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}
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// ChannelPtsAllocator 用 Redis INCR 分配 channel 维度 pts。
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type ChannelPtsAllocator struct {
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counter counterAllocator
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}
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// ChannelIDAllocator 用 Redis INCR 分配全局 channel/supergroup id。
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type ChannelIDAllocator struct {
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counter counterAllocator
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}
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// ChannelMessageIDAllocator 用 Redis INCR 分配 channel 维度 message id。
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type ChannelMessageIDAllocator struct {
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counter counterAllocator
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}
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type counterAllocator struct {
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c *redis.Client
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source store.CounterSource
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key func(int64) string
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name string
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}
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const missingCounterSentinel int64 = -1
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var (
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counterNextScript = redis.NewScript(`
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local current = redis.call("GET", KEYS[1])
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if current then
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return redis.call("INCR", KEYS[1])
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end
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return -1
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`)
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counterNextByScript = redis.NewScript(`
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local current = redis.call("GET", KEYS[1])
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if current then
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return redis.call("INCRBY", KEYS[1], ARGV[1])
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end
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return -1
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`)
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counterRecoverCurrentScript = redis.NewScript(`
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local current = redis.call("GET", KEYS[1])
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if current then
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return tonumber(current)
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end
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redis.call("SET", KEYS[1], ARGV[1])
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return tonumber(ARGV[1])
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`)
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counterRecoverNextScript = redis.NewScript(`
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local current = redis.call("GET", KEYS[1])
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if not current then
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redis.call("SET", KEYS[1], ARGV[1])
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end
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return redis.call("INCR", KEYS[1])
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`)
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counterRecoverNextByScript = redis.NewScript(`
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local current = redis.call("GET", KEYS[1])
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if not current then
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redis.call("SET", KEYS[1], ARGV[1])
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end
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return redis.call("INCRBY", KEYS[1], ARGV[2])
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`)
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)
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// NewPtsAllocator 创建 Redis-backed pts allocator。
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func NewPtsAllocator(c *redis.Client, source store.CounterSource) *PtsAllocator {
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return &PtsAllocator{counter: counterAllocator{
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c: c,
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source: source,
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key: ptsKey,
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name: "pts",
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}}
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}
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// NewBoxIDAllocator 创建 Redis-backed message box id allocator。
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func NewBoxIDAllocator(c *redis.Client, source store.CounterSource) *BoxIDAllocator {
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return &BoxIDAllocator{counter: counterAllocator{
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c: c,
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source: source,
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key: boxIDKey,
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name: "box_id",
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}}
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}
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// NewChannelPtsAllocator 创建 Redis-backed channel pts allocator。
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func NewChannelPtsAllocator(c *redis.Client, source store.CounterSource) *ChannelPtsAllocator {
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return &ChannelPtsAllocator{counter: counterAllocator{
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c: c,
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source: source,
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key: channelPtsKey,
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name: "channel_pts",
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}}
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}
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// NewChannelIDAllocator 创建 Redis-backed channel id allocator。
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func NewChannelIDAllocator(c *redis.Client, source store.CounterSource) *ChannelIDAllocator {
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return &ChannelIDAllocator{counter: counterAllocator{
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c: c,
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source: source,
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key: channelIDKey,
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name: "channel_id",
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}}
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}
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// NewChannelMessageIDAllocator 创建 Redis-backed channel message id allocator。
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func NewChannelMessageIDAllocator(c *redis.Client, source store.CounterSource) *ChannelMessageIDAllocator {
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return &ChannelMessageIDAllocator{counter: counterAllocator{
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c: c,
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source: source,
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key: channelMessageIDKey,
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name: "channel_msg_id",
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}}
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}
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func ptsKey(userID int64) string {
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return fmt.Sprintf("counter:pts:{%d}", userID)
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}
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func boxIDKey(userID int64) string {
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return fmt.Sprintf("counter:box_id:{%d}", userID)
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}
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func channelPtsKey(channelID int64) string {
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return fmt.Sprintf("counter:channel_pts:{%d}", channelID)
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}
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func channelIDKey(_ int64) string {
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return "counter:channel_id"
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}
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func channelMessageIDKey(channelID int64) string {
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return fmt.Sprintf("counter:channel_msg_id:{%d}", channelID)
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}
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func (a *PtsAllocator) NextPts(ctx context.Context, userID int64) (int, error) {
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v, err := a.counter.next(ctx, userID)
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return int(v), err
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}
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func (a *PtsAllocator) NextPtsN(ctx context.Context, userID int64, count int) (int, error) {
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v, err := a.counter.nextBy(ctx, userID, count)
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return int(v), err
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}
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func (a *PtsAllocator) CurrentPts(ctx context.Context, userID int64) (int, error) {
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v, err := a.counter.current(ctx, userID)
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return int(v), err
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}
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func (a *BoxIDAllocator) NextBoxID(ctx context.Context, userID int64) (int, error) {
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v, err := a.counter.next(ctx, userID)
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return int(v), err
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}
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func (a *BoxIDAllocator) CurrentBoxID(ctx context.Context, userID int64) (int, error) {
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v, err := a.counter.current(ctx, userID)
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return int(v), err
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}
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func (a *ChannelPtsAllocator) NextChannelPts(ctx context.Context, channelID int64) (int, error) {
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v, err := a.counter.next(ctx, channelID)
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return int(v), err
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}
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func (a *ChannelPtsAllocator) NextChannelPtsN(ctx context.Context, channelID int64, count int) (int, error) {
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v, err := a.counter.nextBy(ctx, channelID, count)
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return int(v), err
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}
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func (a *ChannelPtsAllocator) CurrentChannelPts(ctx context.Context, channelID int64) (int, error) {
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v, err := a.counter.current(ctx, channelID)
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return int(v), err
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}
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func (a *ChannelIDAllocator) NextChannelID(ctx context.Context) (int64, error) {
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return a.counter.next(ctx, 1)
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}
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func (a *ChannelIDAllocator) CurrentChannelID(ctx context.Context) (int64, error) {
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return a.counter.current(ctx, 1)
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}
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func (a *ChannelMessageIDAllocator) NextChannelMessageID(ctx context.Context, channelID int64) (int, error) {
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v, err := a.counter.next(ctx, channelID)
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return int(v), err
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}
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func (a *ChannelMessageIDAllocator) CurrentChannelMessageID(ctx context.Context, channelID int64) (int, error) {
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v, err := a.counter.current(ctx, channelID)
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return int(v), err
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}
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func (a counterAllocator) next(ctx context.Context, userID int64) (int64, error) {
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return a.nextBy(ctx, userID, 1)
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}
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func (a counterAllocator) nextBy(ctx context.Context, userID int64, count int) (int64, error) {
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if count <= 0 {
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return 0, fmt.Errorf("redis next %s counter: invalid count %d", a.name, count)
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}
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key, err := a.validatedKey(userID)
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if err != nil {
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return 0, err
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}
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script := counterNextScript
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args := []any{}
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if count > 1 {
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script = counterNextByScript
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args = append(args, count)
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}
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v, err := script.Run(ctx, a.c, []string{key}, args...).Int64()
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if err != nil {
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return 0, fmt.Errorf("redis next %s counter: %w", a.name, err)
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}
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if v != missingCounterSentinel {
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return v, nil
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}
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recovered, err := a.recovered(ctx, userID)
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if err != nil {
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return 0, err
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}
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recoverScript := counterRecoverNextScript
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recoverArgs := []any{recovered}
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if count > 1 {
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recoverScript = counterRecoverNextByScript
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recoverArgs = append(recoverArgs, count)
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}
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v, err = recoverScript.Run(ctx, a.c, []string{key}, recoverArgs...).Int64()
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if err != nil {
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return 0, fmt.Errorf("redis recover-next %s counter: %w", a.name, err)
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}
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return v, nil
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}
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func (a counterAllocator) current(ctx context.Context, userID int64) (int64, error) {
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key, err := a.validatedKey(userID)
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if err != nil {
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return 0, err
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}
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v, err := a.c.Get(ctx, key).Int64()
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if err == nil {
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return v, nil
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}
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if !errors.Is(err, redis.Nil) {
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return 0, fmt.Errorf("redis get %s counter: %w", a.name, err)
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}
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recovered, err := a.recovered(ctx, userID)
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if err != nil {
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return 0, err
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}
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v, err = counterRecoverCurrentScript.Run(ctx, a.c, []string{key}, recovered).Int64()
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if err != nil {
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return 0, fmt.Errorf("redis recover-current %s counter: %w", a.name, err)
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}
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return v, nil
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}
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func (a counterAllocator) validatedKey(userID int64) (string, error) {
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if userID == 0 {
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return "", fmt.Errorf("redis %s counter: missing user id", a.name)
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}
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if a.c == nil {
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return "", fmt.Errorf("redis %s counter: nil client", a.name)
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}
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return a.key(userID), nil
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}
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func (a counterAllocator) recovered(ctx context.Context, userID int64) (int, error) {
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recovered := 0
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var err error
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if a.source != nil {
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recovered, err = a.source.Current(ctx, userID)
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if err != nil {
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return 0, fmt.Errorf("recover %s counter: %w", a.name, err)
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}
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}
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return recovered, nil
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}
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