| 1 | package policy |
| 2 | |
| 3 | import ( |
| 4 | "sync" |
| 5 | "time" |
| 6 | |
| 7 | "github.com/gosuda/portal-tunnel/v2/utils" |
| 8 | ) |
| 9 | |
| 10 | type BPSManager struct { |
| 11 | identityBPS *utils.Snapshot[map[string]int64] |
| 12 | identityLimiters map[string]*bpsLimiter |
| 13 | mu sync.RWMutex |
| 14 | } |
| 15 | |
| 16 | func NewBPSManager() *BPSManager { |
| 17 | return &BPSManager{ |
| 18 | identityBPS: utils.NewSnapshot(map[string]int64{}, utils.CloneMap[string, int64]), |
| 19 | identityLimiters: make(map[string]*bpsLimiter), |
| 20 | } |
| 21 | } |
| 22 | |
| 23 | func (m *BPSManager) IdentityBPS(key string) int64 { |
| 24 | if m == nil || key == "" { |
| 25 | return 0 |
| 26 | } |
| 27 | if m.identityBPS == nil { |
| 28 | return 0 |
| 29 | } |
| 30 | return m.identityBPS.Load()[key] |
| 31 | } |
| 32 | |
| 33 | func (m *BPSManager) SetIdentityBPS(key string, bps int64) { |
| 34 | if m == nil || key == "" { |
| 35 | return |
| 36 | } |
| 37 | |
| 38 | if m.identityBPS == nil { |
| 39 | return |
| 40 | } |
| 41 | if bps <= 0 { |
| 42 | m.identityBPS.UpdateCopy(func(limits *map[string]int64) { |
| 43 | delete(*limits, key) |
| 44 | }) |
| 45 | m.mu.Lock() |
| 46 | delete(m.identityLimiters, key) |
| 47 | m.mu.Unlock() |
| 48 | return |
| 49 | } |
| 50 | m.identityBPS.UpdateCopy(func(limits *map[string]int64) { |
| 51 | if *limits == nil { |
| 52 | *limits = make(map[string]int64) |
| 53 | } |
| 54 | (*limits)[key] = bps |
| 55 | }) |
| 56 | } |
| 57 | |
| 58 | func (m *BPSManager) DeleteIdentityBPS(key string) { |
| 59 | if m == nil || key == "" { |
| 60 | return |
| 61 | } |
| 62 | |
| 63 | if m.identityBPS != nil { |
| 64 | m.identityBPS.UpdateCopy(func(limits *map[string]int64) { |
| 65 | delete(*limits, key) |
| 66 | }) |
| 67 | } |
| 68 | m.mu.Lock() |
| 69 | delete(m.identityLimiters, key) |
| 70 | m.mu.Unlock() |
| 71 | } |
| 72 | |
| 73 | func (m *BPSManager) IdentityBPSLimits() map[string]int64 { |
| 74 | if m == nil { |
| 75 | return nil |
| 76 | } |
| 77 | |
| 78 | if m.identityBPS == nil { |
| 79 | return nil |
| 80 | } |
| 81 | return m.identityBPS.Load() |
| 82 | } |
| 83 | |
| 84 | func (m *BPSManager) SetIdentityBPSLimits(limits map[string]int64) { |
| 85 | if m == nil { |
| 86 | return |
| 87 | } |
| 88 | |
| 89 | next := make(map[string]int64, len(limits)) |
| 90 | for key, bps := range limits { |
| 91 | if key == "" || bps <= 0 { |
| 92 | continue |
| 93 | } |
| 94 | next[key] = bps |
| 95 | } |
| 96 | |
| 97 | if m.identityBPS != nil { |
| 98 | m.identityBPS.Store(next) |
| 99 | } |
| 100 | m.mu.Lock() |
| 101 | m.identityLimiters = make(map[string]*bpsLimiter) |
| 102 | m.mu.Unlock() |
| 103 | } |
| 104 | |
| 105 | func (m *BPSManager) ThrottleIdentityBPS(key string, maxBytes int) int { |
| 106 | if m == nil || key == "" || maxBytes <= 0 { |
| 107 | return maxBytes |
| 108 | } |
| 109 | |
| 110 | for { |
| 111 | bps, limiter := m.identityLimiter(key) |
| 112 | if bps <= 0 || limiter == nil { |
| 113 | return maxBytes |
| 114 | } |
| 115 | chunkSize := bpsChunkSize(maxBytes, bps) |
| 116 | if wait := limiter.reserve(float64(chunkSize), float64(bps)); wait > 0 { |
| 117 | time.Sleep(wait) |
| 118 | continue |
| 119 | } |
| 120 | return chunkSize |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | func (m *BPSManager) identityLimiter(key string) (int64, *bpsLimiter) { |
| 125 | bps := m.IdentityBPS(key) |
| 126 | if bps <= 0 { |
| 127 | return 0, nil |
| 128 | } |
| 129 | |
| 130 | m.mu.RLock() |
| 131 | limiter := m.identityLimiters[key] |
| 132 | m.mu.RUnlock() |
| 133 | if limiter != nil { |
| 134 | return bps, limiter |
| 135 | } |
| 136 | |
| 137 | m.mu.Lock() |
| 138 | defer m.mu.Unlock() |
| 139 | |
| 140 | bps = m.IdentityBPS(key) |
| 141 | if bps <= 0 { |
| 142 | return 0, nil |
| 143 | } |
| 144 | if m.identityLimiters == nil { |
| 145 | m.identityLimiters = make(map[string]*bpsLimiter) |
| 146 | } |
| 147 | limiter = m.identityLimiters[key] |
| 148 | if limiter == nil { |
| 149 | limiter = &bpsLimiter{} |
| 150 | m.identityLimiters[key] = limiter |
| 151 | } |
| 152 | return bps, limiter |
| 153 | } |
| 154 | |
| 155 | func bpsChunkSize(length int, bps int64) int { |
| 156 | if bps <= 0 { |
| 157 | return length |
| 158 | } |
| 159 | chunk := bps / 10 |
| 160 | if chunk < 1 { |
| 161 | chunk = 1 |
| 162 | } |
| 163 | if chunk > int64(length) { |
| 164 | chunk = int64(length) |
| 165 | } |
| 166 | return int(chunk) |
| 167 | } |
| 168 | |
| 169 | type bpsLimiter struct { |
| 170 | mu sync.Mutex |
| 171 | tokens float64 |
| 172 | updatedAt time.Time |
| 173 | } |
| 174 | |
| 175 | func (l *bpsLimiter) reserve(bytes, bps float64) time.Duration { |
| 176 | l.mu.Lock() |
| 177 | defer l.mu.Unlock() |
| 178 | |
| 179 | now := time.Now() |
| 180 | if l.updatedAt.IsZero() { |
| 181 | l.updatedAt = now |
| 182 | } else if elapsed := now.Sub(l.updatedAt).Seconds(); elapsed > 0 { |
| 183 | l.tokens += elapsed * bps |
| 184 | l.updatedAt = now |
| 185 | } |
| 186 | if l.tokens > bps { |
| 187 | l.tokens = bps |
| 188 | } |
| 189 | |
| 190 | if l.tokens >= bytes { |
| 191 | l.tokens -= bytes |
| 192 | return 0 |
| 193 | } |
| 194 | |
| 195 | missing := bytes - l.tokens |
| 196 | l.tokens = 0 |
| 197 | l.updatedAt = now |
| 198 | return time.Duration(missing / bps * float64(time.Second)) |
| 199 | } |