65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package server
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import (
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"golang.org/x/time/rate"
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"heckel.io/ntfy/util"
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"sync"
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"time"
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)
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const (
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visitorExpungeAfter = 30 * time.Minute
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)
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// visitor represents an API user, and its associated rate.Limiter used for rate limiting
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type visitor struct {
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config *Config
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limiter *rate.Limiter
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subscriptions *util.Limiter
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seen time.Time
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mu sync.Mutex
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}
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func newVisitor(conf *Config) *visitor {
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return &visitor{
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config: conf,
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limiter: rate.NewLimiter(rate.Every(conf.VisitorRequestLimitReplenish), conf.VisitorRequestLimitBurst),
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subscriptions: util.NewLimiter(int64(conf.VisitorSubscriptionLimit)),
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seen: time.Now(),
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}
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}
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func (v *visitor) RequestAllowed() error {
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if !v.limiter.Allow() {
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return errHTTPTooManyRequests
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}
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return nil
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}
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func (v *visitor) AddSubscription() error {
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v.mu.Lock()
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defer v.mu.Unlock()
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if err := v.subscriptions.Add(1); err != nil {
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return errHTTPTooManyRequests
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}
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return nil
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}
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func (v *visitor) RemoveSubscription() {
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v.mu.Lock()
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defer v.mu.Unlock()
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v.subscriptions.Sub(1)
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}
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func (v *visitor) Keepalive() {
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v.mu.Lock()
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defer v.mu.Unlock()
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v.seen = time.Now()
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}
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func (v *visitor) Stale() bool {
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v.mu.Lock()
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defer v.mu.Unlock()
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return time.Since(v.seen) > visitorExpungeAfter
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}
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