54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
package middleware
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import (
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"net/http"
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"time"
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"github.com/centrifugal/centrifugo/v6/internal/config"
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"github.com/centrifugal/centrifugo/v6/internal/metrics"
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"github.com/centrifugal/centrifugo/v6/internal/tools"
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"github.com/centrifugal/centrifuge"
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"github.com/rs/zerolog/log"
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"golang.org/x/time/rate"
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)
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var connLimitReachedLogLimiter = tools.NewIntervalLimiter(3 * time.Second)
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type ConnLimit struct {
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node *centrifuge.Node
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cfgContainer *config.Container
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rl *rate.Limiter
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}
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func NewConnLimit(node *centrifuge.Node, cfgContainer *config.Container) *ConnLimit {
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rl := connectionRateLimiter(cfgContainer.Config().Client.ConnectionRateLimit)
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return &ConnLimit{node: node, cfgContainer: cfgContainer, rl: rl}
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}
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func (l *ConnLimit) Middleware(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if l.rl != nil && !l.rl.Allow() {
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w.WriteHeader(http.StatusServiceUnavailable)
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return
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}
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connLimit := l.cfgContainer.Config().Client.ConnectionLimit
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if connLimit > 0 && l.node.Hub().NumClients() >= connLimit {
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metrics.ConnLimitReached.Inc()
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if connLimitReachedLogLimiter.Allow() {
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log.Warn().Int("limit", connLimit).Msg("node connection limit reached")
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}
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w.WriteHeader(http.StatusServiceUnavailable)
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return
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}
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h.ServeHTTP(w, r)
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})
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}
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func connectionRateLimiter(connRateLimit int) *rate.Limiter {
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if connRateLimit > 0 {
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return rate.NewLimiter(rate.Limit(connRateLimit), connRateLimit)
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}
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return nil
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}
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