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add http、http2、socks5、relay access speed limiter
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,259 @@ | ||
| package gost | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "errors" | ||
| "io" | ||
| "strconv" | ||
| "strings" | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
| ) | ||
|
|
||
| type Limiter interface { | ||
| CheckRate(key string, checkConcurrent bool) (func(), bool) | ||
| } | ||
|
|
||
| func NewLocalLimiter(user string, cfg string) (*LocalLimiter, error) { | ||
| limiter := LocalLimiter{ | ||
| buckets: map[string]*limiterBucket{}, | ||
| concurrent: map[string]chan bool{}, | ||
| stopped: make(chan struct{}), | ||
| } | ||
| if cfg == "" || user == "" { | ||
| return &limiter, nil | ||
| } | ||
| if err := limiter.AddRule(user, cfg); err != nil { | ||
| return nil, err | ||
| } | ||
| return &limiter, nil | ||
| } | ||
|
|
||
| // Token Bucket | ||
| type limiterBucket struct { | ||
| max int64 | ||
| cur int64 | ||
| duration int64 | ||
| batch int64 | ||
| } | ||
|
|
||
| type LocalLimiter struct { | ||
| buckets map[string]*limiterBucket | ||
| concurrent map[string]chan bool | ||
| mux sync.RWMutex | ||
| stopped chan struct{} | ||
| period time.Duration | ||
| } | ||
|
|
||
| func (l *LocalLimiter) CheckRate(key string, checkConcurrent bool) (func(), bool) { | ||
| if checkConcurrent { | ||
| done, ok := l.checkConcurrent(key) | ||
| if !ok { | ||
| return nil, false | ||
| } | ||
| if t := l.getToken(key); !t { | ||
| done() | ||
| return nil, false | ||
| } | ||
| return done, true | ||
| } else { | ||
| if t := l.getToken(key); !t { | ||
| return nil, false | ||
| } | ||
| return nil, true | ||
| } | ||
| } | ||
|
|
||
| func (l *LocalLimiter) AddRule(user string, cfg string) error { | ||
| if user == "" { | ||
| return nil | ||
| } | ||
| if cfg == "" { | ||
| //reload need check old limit exists | ||
| if _, ok := l.buckets[user]; ok { | ||
| delete(l.buckets, user) | ||
| } | ||
| if _, ok := l.concurrent[user]; ok { | ||
| delete(l.concurrent, user) | ||
| } | ||
| return nil | ||
| } | ||
| args := strings.Split(cfg, ",") | ||
| if len(args) < 2 || len(args) > 3 { | ||
| return errors.New("parse limiter fail:" + cfg) | ||
| } | ||
| if len(args) == 2 { | ||
| args = append(args, "0") | ||
| } | ||
|
|
||
| duration, e1 := strconv.ParseInt(strings.TrimSpace(args[0]), 10, 64) | ||
| count, e2 := strconv.ParseInt(strings.TrimSpace(args[1]), 10, 64) | ||
| cur, e3 := strconv.ParseInt(strings.TrimSpace(args[2]), 10, 64) | ||
| if e1 != nil || e2 != nil || e3 != nil { | ||
| return errors.New("parse limiter fail:" + cfg) | ||
| } | ||
| // 0 means not limit | ||
| if duration > 0 && count > 0 { | ||
| bu := &limiterBucket{ | ||
| cur: count * 10, | ||
| max: count * 10, | ||
| duration: duration * 100, | ||
| batch: count, | ||
| } | ||
| go func() { | ||
| for { | ||
| time.Sleep(time.Millisecond * time.Duration(bu.duration)) | ||
| if bu.cur+bu.batch > bu.max { | ||
| bu.cur = bu.max | ||
| } else { | ||
| atomic.AddInt64(&bu.cur, bu.batch) | ||
| } | ||
| } | ||
| }() | ||
| l.buckets[user] = bu | ||
| } else { | ||
| if _, ok := l.buckets[user]; ok { | ||
| delete(l.buckets, user) | ||
| } | ||
| } | ||
| // zero means not limit | ||
| if cur > 0 { | ||
| l.concurrent[user] = make(chan bool, cur) | ||
| } else { | ||
| if _, ok := l.concurrent[user]; ok { | ||
| delete(l.concurrent, user) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Reload parses config from r, then live reloads the LocalLimiter. | ||
| func (l *LocalLimiter) Reload(r io.Reader) error { | ||
| var period time.Duration | ||
| kvs := make(map[string]string) | ||
|
|
||
| if r == nil || l.Stopped() { | ||
| return nil | ||
| } | ||
|
|
||
| // splitLine splits a line text by white space. | ||
| // A line started with '#' will be ignored, otherwise it is valid. | ||
| split := func(line string) []string { | ||
| if line == "" { | ||
| return nil | ||
| } | ||
| line = strings.Replace(line, "\t", " ", -1) | ||
| line = strings.TrimSpace(line) | ||
|
|
||
| if strings.IndexByte(line, '#') == 0 { | ||
| return nil | ||
| } | ||
|
|
||
| var ss []string | ||
| for _, s := range strings.Split(line, " ") { | ||
| if s = strings.TrimSpace(s); s != "" { | ||
| ss = append(ss, s) | ||
| } | ||
| } | ||
| return ss | ||
| } | ||
|
|
||
| scanner := bufio.NewScanner(r) | ||
| for scanner.Scan() { | ||
| line := scanner.Text() | ||
| ss := split(line) | ||
| if len(ss) == 0 { | ||
| continue | ||
| } | ||
|
|
||
| switch ss[0] { | ||
| case "reload": // reload option | ||
| if len(ss) > 1 { | ||
| period, _ = time.ParseDuration(ss[1]) | ||
| } | ||
| default: | ||
| var k, v string | ||
| k = ss[0] | ||
| if len(ss) > 2 { | ||
| v = ss[2] | ||
| } | ||
| kvs[k] = v | ||
| } | ||
| } | ||
|
|
||
| if err := scanner.Err(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| l.mux.Lock() | ||
| defer l.mux.Unlock() | ||
|
|
||
| l.period = period | ||
| for user, args := range kvs { | ||
| err := l.AddRule(user, args) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // Period returns the reload period. | ||
| func (l *LocalLimiter) Period() time.Duration { | ||
| if l.Stopped() { | ||
| return -1 | ||
| } | ||
|
|
||
| l.mux.RLock() | ||
| defer l.mux.RUnlock() | ||
|
|
||
| return l.period | ||
| } | ||
|
|
||
| // Stop stops reloading. | ||
| func (l *LocalLimiter) Stop() { | ||
| select { | ||
| case <-l.stopped: | ||
| default: | ||
| close(l.stopped) | ||
| } | ||
| } | ||
|
|
||
| // Stopped checks whether the reloader is stopped. | ||
| func (l *LocalLimiter) Stopped() bool { | ||
| select { | ||
| case <-l.stopped: | ||
| return true | ||
| default: | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| func (l *LocalLimiter) getToken(key string) bool { | ||
| b, ok := l.buckets[key] | ||
| if !ok || b == nil { | ||
| return true | ||
| } | ||
| if b.cur <= 0 { | ||
| return false | ||
| } | ||
| atomic.AddInt64(&b.cur, -10) | ||
| return true | ||
| } | ||
|
|
||
| func (l *LocalLimiter) checkConcurrent(key string) (func(), bool) { | ||
| c, ok := l.concurrent[key] | ||
| if !ok || c == nil { | ||
| return func() {}, true | ||
| } | ||
| select { | ||
| case c <- true: | ||
| return func() { | ||
| <-c | ||
| }, true | ||
| default: | ||
| return nil, false | ||
| } | ||
| } |
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