523 lines
16 KiB
Go
523 lines
16 KiB
Go
package platform
|
||
|
||
import (
|
||
"context"
|
||
"errors"
|
||
"fmt"
|
||
"log"
|
||
"math/rand/v2"
|
||
"os"
|
||
"strconv"
|
||
"strings"
|
||
"sync"
|
||
"time"
|
||
"yingce/backend/internal/kernel"
|
||
|
||
"github.com/redis/go-redis/v9"
|
||
)
|
||
|
||
type localRateEntry struct {
|
||
started time.Time
|
||
count int
|
||
}
|
||
|
||
const (
|
||
MinChannelConcurrencyLimit = 1
|
||
MaxChannelConcurrencyLimit = maxRuntimeConcurrency
|
||
defaultChannelConcurrencyValue = 8
|
||
)
|
||
|
||
type channelSlotError struct {
|
||
scope string
|
||
limit int
|
||
err error
|
||
}
|
||
|
||
func (e channelSlotError) Error() string {
|
||
if errors.Is(e.err, context.DeadlineExceeded) {
|
||
return fmt.Sprintf("等待渠道并发槽位超时（渠道 %s，并发上限 %d）", e.scope, e.limit)
|
||
}
|
||
if errors.Is(e.err, context.Canceled) {
|
||
return fmt.Sprintf("等待渠道并发槽位已取消（渠道 %s，并发上限 %d）", e.scope, e.limit)
|
||
}
|
||
return fmt.Sprintf("获取渠道并发配额失败（渠道 %s，并发上限 %d）：%v", e.scope, e.limit, e.err)
|
||
}
|
||
|
||
func (e channelSlotError) Unwrap() error { return e.err }
|
||
|
||
func ChannelSlotFailureDetails(err error) (string, string) {
|
||
var slotErr channelSlotError
|
||
if !errors.As(err, &slotErr) {
|
||
return "", ""
|
||
}
|
||
if errors.Is(slotErr, context.DeadlineExceeded) {
|
||
return "channel_concurrency_wait_timeout", slotErr.Error()
|
||
}
|
||
if errors.Is(slotErr, context.Canceled) {
|
||
return "channel_concurrency_wait_cancelled", slotErr.Error()
|
||
}
|
||
return "channel_concurrency_unavailable", slotErr.Error()
|
||
}
|
||
|
||
type Coordinator struct {
|
||
redis *redis.Client
|
||
instanceID string
|
||
localMu sync.Mutex
|
||
localRate map[string]localRateEntry
|
||
localSlots map[string]map[string]time.Time
|
||
}
|
||
|
||
var fixedWindowScript = redis.NewScript(`
|
||
local existing = tonumber(redis.call('GET', KEYS[1]) or '0')
|
||
if existing >= tonumber(ARGV[2]) then return existing + 1 end
|
||
local count = redis.call('INCR', KEYS[1])
|
||
if count == 1 then redis.call('PEXPIRE', KEYS[1], ARGV[1]) end
|
||
return count
|
||
`)
|
||
|
||
var acquireSlotScript = redis.NewScript(`
|
||
redis.call('ZREMRANGEBYSCORE', KEYS[1], '-inf', ARGV[1])
|
||
if redis.call('ZCARD', KEYS[1]) >= tonumber(ARGV[3]) then return 0 end
|
||
redis.call('ZADD', KEYS[1], ARGV[2], ARGV[4])
|
||
local latest = redis.call('ZREVRANGE', KEYS[1], 0, 0, 'WITHSCORES')
|
||
redis.call('PEXPIRE', KEYS[1], math.max(tonumber(ARGV[5]), tonumber(latest[2]) - tonumber(ARGV[1]) + 60000))
|
||
return 1
|
||
`)
|
||
|
||
func NewCoordinator(dialect string) (*Coordinator, error) {
|
||
coordinator := &Coordinator{instanceID: kernel.NewID(), localRate: map[string]localRateEntry{}, localSlots: map[string]map[string]time.Time{}}
|
||
redisURL := strings.TrimSpace(os.Getenv("REDIS_URL"))
|
||
if redisURL == "" {
|
||
if dialect == "postgres" {
|
||
return coordinator, errors.New("PostgreSQL 多实例模式必须配置 REDIS_URL，用于限流、并发和熔断协调")
|
||
}
|
||
return coordinator, nil
|
||
}
|
||
options, err := redis.ParseURL(redisURL)
|
||
if err != nil {
|
||
return coordinator, fmt.Errorf("REDIS_URL 无效：%w", err)
|
||
}
|
||
// 协调写操作不透明重试；限流/并发失败必须及时向调用方返回，不能放大故障流量。
|
||
options.MaxRetries = -1
|
||
options.ContextTimeoutEnabled = true
|
||
coordinator.redis = redis.NewClient(options)
|
||
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
|
||
defer cancel()
|
||
if err := coordinator.redis.Ping(ctx).Err(); err != nil {
|
||
return coordinator, fmt.Errorf("Redis 不可用：%w", err)
|
||
}
|
||
return coordinator, nil
|
||
}
|
||
|
||
// NewCoordinatorWithRedis builds a coordinator around an already connected
|
||
// Redis client. The composition root normally uses NewCoordinator; this
|
||
// constructor keeps integration tests and embedded deployments from reaching
|
||
// into Coordinator's private state.
|
||
func NewCoordinatorWithRedis(client *redis.Client, instanceID string) *Coordinator {
|
||
if strings.TrimSpace(instanceID) == "" {
|
||
instanceID = kernel.NewID()
|
||
}
|
||
return &Coordinator{
|
||
redis: client,
|
||
instanceID: instanceID,
|
||
localRate: map[string]localRateEntry{},
|
||
localSlots: map[string]map[string]time.Time{},
|
||
}
|
||
}
|
||
|
||
func (c *Coordinator) Allow(ctx context.Context, key string, limit int, window time.Duration) (bool, error) {
|
||
if c.redis != nil {
|
||
count, err := fixedWindowScript.Run(ctx, c.redis, []string{"canvas:rate:" + key}, window.Milliseconds(), limit).Int64()
|
||
return count <= int64(limit), err
|
||
}
|
||
c.localMu.Lock()
|
||
defer c.localMu.Unlock()
|
||
now := time.Now()
|
||
entry := c.localRate[key]
|
||
if entry.started.IsZero() || now.Sub(entry.started) >= window {
|
||
c.localRate[key] = localRateEntry{started: now, count: 1}
|
||
return true, nil
|
||
}
|
||
if entry.count >= limit {
|
||
return false, nil
|
||
}
|
||
entry.count++
|
||
c.localRate[key] = entry
|
||
return true, nil
|
||
}
|
||
|
||
func (c *Coordinator) Acquire(ctx context.Context, scope string, limit int, ttl time.Duration) (func(), bool, error) {
|
||
lease, acquired, err := c.AcquireLease(ctx, scope, limit, ttl)
|
||
if err != nil || !acquired {
|
||
return nil, acquired, err
|
||
}
|
||
return lease.Release, true, nil
|
||
}
|
||
|
||
func (c *Coordinator) AcquireLease(ctx context.Context, scope string, limit int, ttl time.Duration) (*SlotLease, bool, error) {
|
||
if err := ctx.Err(); err != nil {
|
||
return nil, false, err
|
||
}
|
||
if limit <= 0 || ttl <= 0 {
|
||
return nil, false, errors.New("并发租约参数无效")
|
||
}
|
||
lease := &SlotLease{coordinator: c, scope: scope, token: c.instanceID + ":" + kernel.NewID(), ttl: ttl}
|
||
if c.redis == nil {
|
||
c.localMu.Lock()
|
||
now := time.Now()
|
||
slots := c.localSlots[scope]
|
||
if slots == nil {
|
||
slots = map[string]time.Time{}
|
||
c.localSlots[scope] = slots
|
||
}
|
||
for token, expiresAt := range slots {
|
||
if !expiresAt.After(now) {
|
||
delete(slots, token)
|
||
}
|
||
}
|
||
if len(slots) >= limit {
|
||
c.localMu.Unlock()
|
||
return nil, false, nil
|
||
}
|
||
slots[lease.token] = now.Add(ttl)
|
||
c.localMu.Unlock()
|
||
return lease, true, nil
|
||
}
|
||
// 有过期分数的有序集合避免实例崩溃后永久占槽，业务数据库仍保存任务与账本真相。
|
||
key := "canvas:slots:" + scope
|
||
ctx, cancel := context.WithTimeout(ctx, CoordinationTimeout)
|
||
defer cancel()
|
||
now := time.Now()
|
||
ok, err := acquireSlotScript.Run(ctx, c.redis, []string{key}, now.UnixMilli(), now.Add(ttl).UnixMilli(), limit, lease.token, (ttl + time.Minute).Milliseconds()).Int()
|
||
if err != nil || ok != 1 {
|
||
return nil, false, err
|
||
}
|
||
return lease, true, nil
|
||
}
|
||
|
||
const CoordinationTimeout = 2 * time.Second
|
||
|
||
type SlotLease struct {
|
||
coordinator *Coordinator
|
||
scope string
|
||
token string
|
||
ttl time.Duration
|
||
once sync.Once
|
||
}
|
||
|
||
var renewSlotScript = redis.NewScript(`
|
||
local expires = redis.call('ZSCORE', KEYS[1], ARGV[1])
|
||
if not expires or tonumber(expires) <= tonumber(ARGV[2]) then return 0 end
|
||
redis.call('ZADD', KEYS[1], 'XX', ARGV[3], ARGV[1])
|
||
local latest = redis.call('ZREVRANGE', KEYS[1], 0, 0, 'WITHSCORES')
|
||
redis.call('PEXPIRE', KEYS[1], math.max(tonumber(ARGV[4]), tonumber(latest[2]) - tonumber(ARGV[2]) + 60000))
|
||
return 1
|
||
`)
|
||
|
||
func (l *SlotLease) Token() string {
|
||
if l == nil {
|
||
return ""
|
||
}
|
||
return l.token
|
||
}
|
||
|
||
func (l *SlotLease) Renew(ctx context.Context) error {
|
||
if err := ctx.Err(); err != nil {
|
||
return err
|
||
}
|
||
c := l.coordinator
|
||
now := time.Now()
|
||
if c.redis == nil {
|
||
c.localMu.Lock()
|
||
defer c.localMu.Unlock()
|
||
if !c.localSlots[l.scope][l.token].After(now) {
|
||
return errors.New("并发租约已失效")
|
||
}
|
||
c.localSlots[l.scope][l.token] = now.Add(l.ttl)
|
||
return nil
|
||
}
|
||
ctx, cancel := context.WithTimeout(ctx, CoordinationTimeout)
|
||
defer cancel()
|
||
ok, err := renewSlotScript.Run(ctx, c.redis, []string{"canvas:slots:" + l.scope}, l.token, now.UnixMilli(), now.Add(l.ttl).UnixMilli(), (l.ttl + time.Minute).Milliseconds()).Int()
|
||
if err != nil {
|
||
return err
|
||
}
|
||
if ok != 1 {
|
||
return errors.New("并发租约已失效")
|
||
}
|
||
return nil
|
||
}
|
||
|
||
func (l *SlotLease) Release() {
|
||
l.once.Do(func() {
|
||
c := l.coordinator
|
||
if c.redis == nil {
|
||
c.localMu.Lock()
|
||
defer c.localMu.Unlock()
|
||
delete(c.localSlots[l.scope], l.token)
|
||
if len(c.localSlots[l.scope]) == 0 {
|
||
delete(c.localSlots, l.scope)
|
||
}
|
||
return
|
||
}
|
||
ctx, cancel := context.WithTimeout(context.Background(), CoordinationTimeout)
|
||
defer cancel()
|
||
if err := c.redis.ZRem(ctx, "canvas:slots:"+l.scope, l.token).Err(); err != nil {
|
||
log.Printf("concurrency lease release failed: scope=%s error=%v", l.scope, err)
|
||
}
|
||
})
|
||
}
|
||
|
||
func (c *Coordinator) AcquireWithWait(ctx context.Context, scope string, limit int, ttl time.Duration) (func(), error) {
|
||
delay := 200 * time.Millisecond
|
||
for {
|
||
if err := ctx.Err(); err != nil {
|
||
return nil, err
|
||
}
|
||
release, acquired, err := c.Acquire(ctx, scope, limit, ttl)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
if acquired {
|
||
return release, nil
|
||
}
|
||
// 满载期间退避并错峰，避免每个等待者固定每秒五次同步争抢 Redis。
|
||
wait := time.NewTimer(channelSlotRetryDelay(delay))
|
||
select {
|
||
case <-ctx.Done():
|
||
wait.Stop()
|
||
return nil, ctx.Err()
|
||
case <-wait.C:
|
||
}
|
||
delay = min(delay*2, 2*time.Second)
|
||
}
|
||
}
|
||
|
||
func channelSlotRetryDelay(delay time.Duration) time.Duration {
|
||
// 上限 2s，下半窗口随机等待，保留首轮至少 100ms 的退让。
|
||
return delay/2 + time.Duration(rand.Int64N(int64(delay/2)+1))
|
||
}
|
||
|
||
func (c *Coordinator) CircuitOpen(ctx context.Context, channelID string) (bool, error) {
|
||
if c.redis == nil || strings.TrimSpace(channelID) == "" {
|
||
return false, nil
|
||
}
|
||
count, err := c.redis.Exists(ctx, "canvas:circuit:open:"+channelID).Result()
|
||
return count > 0, err
|
||
}
|
||
|
||
func (c *Coordinator) RecordChannelResult(ctx context.Context, channelID string, failed bool, failureLimit int, openDuration time.Duration) {
|
||
if c.redis == nil || strings.TrimSpace(channelID) == "" {
|
||
return
|
||
}
|
||
failureKey := "canvas:circuit:failures:" + channelID
|
||
openKey := "canvas:circuit:open:" + channelID
|
||
if !failed {
|
||
_ = c.redis.Del(ctx, failureKey, openKey).Err()
|
||
return
|
||
}
|
||
count, err := c.redis.Incr(ctx, failureKey).Result()
|
||
if err != nil {
|
||
return
|
||
}
|
||
_ = c.redis.Expire(ctx, failureKey, time.Minute).Err()
|
||
if count >= int64(failureLimit) {
|
||
_ = c.redis.Set(ctx, openKey, "1", openDuration).Err()
|
||
}
|
||
}
|
||
|
||
const RouteCatalogVersionKey = "canvas:logical-model-route-catalog:version"
|
||
|
||
func (c *Coordinator) RouteCatalogVersion(ctx context.Context) (int64, error) {
|
||
if c == nil || c.redis == nil {
|
||
return 0, nil
|
||
}
|
||
value, err := c.redis.Get(ctx, RouteCatalogVersionKey).Int64()
|
||
if err == redis.Nil {
|
||
return 0, nil
|
||
}
|
||
return value, err
|
||
}
|
||
|
||
func (c *Coordinator) BumpRouteCatalogVersion(ctx context.Context) error {
|
||
if c == nil || c.redis == nil {
|
||
return nil
|
||
}
|
||
return c.redis.Incr(ctx, RouteCatalogVersionKey).Err()
|
||
}
|
||
|
||
func routeHealthKey(key string) string { return "canvas:logical-route-health:" + key }
|
||
|
||
func (c *Coordinator) RouteBlockedUntil(ctx context.Context, key string) (time.Time, error) {
|
||
if c == nil || c.redis == nil {
|
||
return time.Time{}, nil
|
||
}
|
||
value, err := c.redis.Get(ctx, routeHealthKey(key)).Int64()
|
||
if err == redis.Nil {
|
||
return time.Time{}, nil
|
||
}
|
||
if err != nil {
|
||
return time.Time{}, err
|
||
}
|
||
return time.UnixMilli(value), nil
|
||
}
|
||
|
||
func (c *Coordinator) BlockRoute(ctx context.Context, key string, until time.Time) error {
|
||
if c == nil || c.redis == nil {
|
||
return nil
|
||
}
|
||
ttl := time.Until(until)
|
||
if ttl <= 0 {
|
||
return c.redis.Del(ctx, routeHealthKey(key)).Err()
|
||
}
|
||
return c.redis.Set(ctx, routeHealthKey(key), until.UnixMilli(), ttl).Err()
|
||
}
|
||
|
||
func envInt(key string, fallback int) int {
|
||
value, err := strconv.Atoi(strings.TrimSpace(os.Getenv(key)))
|
||
if err != nil || value <= 0 {
|
||
return fallback
|
||
}
|
||
return value
|
||
}
|
||
|
||
func defaultWorkerConcurrencyLimit() int {
|
||
return envInt("CANVAS_WORKER_CONCURRENCY", defaultWorkerConcurrency)
|
||
}
|
||
|
||
func defaultChannelConcurrencyLimit() int {
|
||
return envInt("CANVAS_CHANNEL_CONCURRENCY", defaultChannelConcurrencyValue)
|
||
}
|
||
|
||
func effectiveChannelConcurrencyLimit(configured int) int {
|
||
if configured < MinChannelConcurrencyLimit || configured > MaxChannelConcurrencyLimit {
|
||
return defaultChannelConcurrencyLimit()
|
||
}
|
||
return configured
|
||
}
|
||
|
||
func (s *Service) AcquireChannelSlot(ctx context.Context, channelID string, fallbackScope string, ttl time.Duration) (func(), int, error) {
|
||
setting, err := s.RuntimeConcurrencySetting()
|
||
limit := defaultChannelConcurrencyLimit()
|
||
if err != nil {
|
||
return nil, limit, channelSlotError{scope: kernel.FirstNonEmpty(strings.TrimSpace(channelID), strings.TrimSpace(fallbackScope), "unknown"), limit: limit, err: fmt.Errorf("读取全局并发配置失败：%w", err)}
|
||
}
|
||
limit = setting.ChannelConcurrency
|
||
scope := strings.TrimSpace(channelID)
|
||
if scope != "" {
|
||
channelLimit, err := s.host.ChannelConcurrencyLimit(scope)
|
||
if err != nil {
|
||
return nil, limit, channelSlotError{scope: scope, limit: limit, err: fmt.Errorf("读取渠道并发配置失败：%w", err)}
|
||
}
|
||
if channelLimit > 0 {
|
||
if channelLimit < MinChannelConcurrencyLimit || channelLimit > MaxChannelConcurrencyLimit {
|
||
return nil, limit, channelSlotError{scope: scope, limit: limit, err: errors.New("渠道并发配置超出 1-999 范围")}
|
||
}
|
||
limit = channelLimit
|
||
}
|
||
} else {
|
||
scope = strings.TrimSpace(fallbackScope)
|
||
}
|
||
if scope == "" {
|
||
return nil, limit, channelSlotError{scope: "unknown", limit: limit, err: errors.New("渠道并发范围为空")}
|
||
}
|
||
if s.Coordinator == nil {
|
||
return nil, limit, channelSlotError{scope: scope, limit: limit, err: errors.New("运行时协调器未初始化")}
|
||
}
|
||
release, err := s.Coordinator.AcquireWithWait(ctx, "channel:"+scope, limit, ttl)
|
||
if err != nil {
|
||
return nil, limit, channelSlotError{scope: scope, limit: limit, err: err}
|
||
}
|
||
return release, limit, nil
|
||
}
|
||
|
||
func (s *Service) Close() error {
|
||
if s == nil || s.Coordinator == nil || !s.Coordinator.HasRedis() {
|
||
return nil
|
||
}
|
||
return s.Coordinator.Redis().Close()
|
||
}
|
||
|
||
func (s *Service) AllowRequest(ctx context.Context, key string, limit int, window time.Duration) (bool, error) {
|
||
if s.Coordinator == nil {
|
||
return false, errors.New("运行时协调器未初始化")
|
||
}
|
||
return s.Coordinator.Allow(ctx, key, limit, window)
|
||
}
|
||
|
||
func (s *Service) RequestRetryAfter(ctx context.Context, key string, window time.Duration) time.Duration {
|
||
if s == nil || s.Coordinator == nil {
|
||
return window
|
||
}
|
||
return s.Coordinator.RateRetryAfter(ctx, key, window)
|
||
}
|
||
|
||
func (s *Service) AcquireCustomRelaySlot(ctx context.Context, userID string, limit int, ttl time.Duration) (func(), bool, error) {
|
||
if s.Coordinator == nil {
|
||
return nil, false, errors.New("运行时协调器未初始化")
|
||
}
|
||
return s.Coordinator.Acquire(ctx, "custom-relay:"+userID, limit, ttl)
|
||
}
|
||
|
||
func (c *Coordinator) HasRedis() bool {
|
||
return c != nil && c.redis != nil
|
||
}
|
||
|
||
func (c *Coordinator) Redis() *redis.Client {
|
||
if c == nil {
|
||
return nil
|
||
}
|
||
return c.redis
|
||
}
|
||
|
||
func (c *Coordinator) LocalRateCount() int {
|
||
if c == nil {
|
||
return 0
|
||
}
|
||
c.localMu.Lock()
|
||
defer c.localMu.Unlock()
|
||
return len(c.localRate)
|
||
}
|
||
|
||
func (c *Coordinator) ClearLocalRate() int {
|
||
if c == nil {
|
||
return 0
|
||
}
|
||
c.localMu.Lock()
|
||
defer c.localMu.Unlock()
|
||
count := len(c.localRate)
|
||
c.localRate = map[string]localRateEntry{}
|
||
return count
|
||
}
|
||
|
||
func (c *Coordinator) RateRetryAfter(ctx context.Context, key string, window time.Duration) time.Duration {
|
||
if c == nil {
|
||
return window
|
||
}
|
||
if c.redis != nil {
|
||
ttl, err := c.redis.PTTL(ctx, "canvas:rate:"+key).Result()
|
||
if err == nil && ttl > 0 {
|
||
return ttl
|
||
}
|
||
return window
|
||
}
|
||
c.localMu.Lock()
|
||
defer c.localMu.Unlock()
|
||
if entry, ok := c.localRate[key]; ok {
|
||
return max(time.Second, time.Until(entry.started.Add(window)))
|
||
}
|
||
return time.Second
|
||
}
|
||
|
||
func (s *Service) RecordChannelResult(ctx context.Context, channelID string, failed bool) error {
|
||
policy, err := s.RuntimePolicy()
|
||
if err != nil {
|
||
return err
|
||
}
|
||
if s.Coordinator == nil {
|
||
return errors.New("运行时协调器未初始化")
|
||
}
|
||
s.Coordinator.RecordChannelResult(ctx, channelID, failed, policy.Request.ChannelCircuitFailureCount, time.Duration(policy.Request.ChannelCircuitOpenSeconds)*time.Second)
|
||
return nil
|
||
}
|