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feat(ratelimit): add rate limit logic
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "hash/maphash" | ||
| "time" | ||
|
|
||
| "github.com/cespare/xxhash/v2" | ||
| "github.com/hugefiver/fakessh/conf" | ||
| "github.com/puzpuzpuz/xsync/v2" | ||
| "golang.org/x/time/rate" | ||
| ) | ||
|
|
||
| type RateLimiter struct { | ||
| limiters []*rate.Limiter | ||
| } | ||
|
|
||
| type Reservation struct { | ||
| reservations []*rate.Reservation | ||
| ok bool | ||
| } | ||
|
|
||
| func (r Reservation) OK() bool { | ||
| return r.ok | ||
| } | ||
|
|
||
| func (r Reservation) CancelAt(t time.Time) { | ||
| for _, x := range r.reservations { | ||
| x.CancelAt(t) | ||
| } | ||
| } | ||
|
|
||
| func (r Reservation) Cancel() { | ||
| r.CancelAt(time.Now()) | ||
| } | ||
|
|
||
| func (r Reservation) Merge(o Reservation) Reservation { | ||
| if !r.ok || !o.ok { | ||
| return Reservation{ok: false} | ||
| } | ||
|
|
||
| reservations := make([]*rate.Reservation, 0, len(r.reservations)+len(o.reservations)) | ||
| return Reservation{ | ||
| reservations: append(append(reservations, r.reservations...), o.reservations...), | ||
| ok: true, | ||
| } | ||
| } | ||
|
|
||
| func NewRateLimiter(cs []*conf.RateLimitConfig) *RateLimiter { | ||
| rs := make([]*rate.Limiter, len(cs)) | ||
|
|
||
| for i, c := range cs { | ||
| rs[i] = rate.NewLimiter(rate.Every(c.Interval.Duration()), c.Limit) | ||
| } | ||
| return &RateLimiter{limiters: rs} | ||
| } | ||
|
|
||
| func (r *RateLimiter) AllowN(n int) Reservation { | ||
| if len(r.limiters) == 0 { | ||
| return Reservation{ok: true} | ||
| } | ||
|
|
||
| var taken []*rate.Reservation | ||
| now := time.Now() | ||
| for _, l := range r.limiters { | ||
| if rsv := l.ReserveN(now, n); !rsv.OK() { | ||
| for _, x := range taken { | ||
| x.CancelAt(now) | ||
| } | ||
| return Reservation{ok: false} | ||
| } else { | ||
| taken = append(taken, rsv) | ||
| } | ||
| } | ||
| return Reservation{ok: true, reservations: taken} | ||
| } | ||
|
|
||
| func (r *RateLimiter) Allow() Reservation { | ||
| return r.AllowN(1) | ||
| } | ||
|
|
||
| type SSHRateLimiter struct { | ||
| globalConfs []*conf.RateLimitConfig | ||
| peripConfs []*conf.RateLimitConfig | ||
|
|
||
| globalRl *RateLimiter | ||
| peripRls *xsync.MapOf[string, *RateLimiter] | ||
| } | ||
|
|
||
| func hashString(seed maphash.Seed, s string) uint64 { | ||
| h := xxhash.NewWithSeed(seedSize) | ||
|
|
||
| _, _ = h.WriteString(s) | ||
| return h.Sum64() | ||
| } | ||
|
|
||
| func NewSSHRateLimiter(global []*conf.RateLimitConfig, perip []*conf.RateLimitConfig) *SSHRateLimiter { | ||
| return &SSHRateLimiter{ | ||
| globalConfs: global, | ||
| peripConfs: perip, | ||
| globalRl: NewRateLimiter(global), | ||
| peripRls: xsync.NewTypedMapOf[string, *RateLimiter](hashString), | ||
| } | ||
| } | ||
|
|
||
| func (r *SSHRateLimiter) HasPerIP() bool { | ||
| return len(r.peripConfs) > 0 | ||
| } | ||
|
|
||
| func (r *SSHRateLimiter) AllowGlobal() Reservation { | ||
| return r.globalRl.Allow() | ||
| } | ||
|
|
||
| func (r *SSHRateLimiter) AllowPerIP(ip string) Reservation { | ||
| if !r.HasPerIP() { | ||
| return Reservation{ok: true} | ||
| } | ||
|
|
||
| var rl *RateLimiter | ||
| if v, ok := r.peripRls.Load(ip); ok { | ||
| rl = v | ||
| } else { | ||
| rl = NewRateLimiter(r.peripConfs) | ||
| rl, _ = r.peripRls.LoadOrStore(ip, rl) | ||
| } | ||
|
|
||
| return rl.Allow() | ||
| } | ||
|
|
||
| func (r *SSHRateLimiter) Allow(ip string) Reservation { | ||
| rsv := r.AllowGlobal() | ||
| if rsv.OK() && r.HasPerIP() { | ||
| if rsv2 := r.AllowPerIP(ip); rsv2.OK() { | ||
| return rsv.Merge(rsv2) | ||
| } | ||
| rsv.Cancel() | ||
| return Reservation{ok: false} | ||
| } | ||
|
|
||
| return rsv | ||
| } | ||
|
|
||
| func (r *SSHRateLimiter) CleanEmpty() (int, int) { | ||
| cleaned := 0 | ||
| kept := 0 | ||
| r.peripRls.Range(func(k string, v *RateLimiter) bool { | ||
| ok := true | ||
| for _, l := range v.limiters { | ||
| if l.Tokens() < float64(l.Burst()) { | ||
| ok = false | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if ok { | ||
| r.peripRls.Delete(k) | ||
| cleaned++ | ||
| } else { | ||
| kept++ | ||
| } | ||
| return true | ||
| }) | ||
|
|
||
| log.Debugf("[RateLimiterClean] cleaned %d, kept %d", cleaned, kept) | ||
|
|
||
| return cleaned, kept | ||
| } |
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