ntfy/server/visitor.go

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2021-11-01 20:21:38 +01:00
package server
import (
"golang.org/x/time/rate"
"heckel.io/ntfy/config"
"sync"
"time"
)
const (
visitorExpungeAfter = 30 * time.Minute
)
// visitor represents an API user, and its associated rate.Limiter used for rate limiting
type visitor struct {
config *config.Config
limiter *rate.Limiter
subscriptions int
seen time.Time
mu sync.Mutex
}
func newVisitor(conf *config.Config) *visitor {
return &visitor{
config: conf,
limiter: rate.NewLimiter(conf.RequestLimit, conf.RequestLimitBurst),
seen: time.Now(),
}
}
func (v *visitor) RequestAllowed() error {
if !v.limiter.Allow() {
return errHTTPTooManyRequests
}
return nil
}
func (v *visitor) AddSubscription() error {
v.mu.Lock()
defer v.mu.Unlock()
if v.subscriptions >= v.config.SubscriptionLimit {
return errHTTPTooManyRequests
}
v.subscriptions++
return nil
}
func (v *visitor) RemoveSubscription() {
v.mu.Lock()
defer v.mu.Unlock()
v.subscriptions--
}
func (v *visitor) Keepalive() {
v.mu.Lock()
defer v.mu.Unlock()
v.seen = time.Now()
}
func (v *visitor) Stale() bool {
v.mu.Lock()
defer v.mu.Unlock()
v.seen = time.Now()
return time.Since(v.seen) > visitorExpungeAfter
}