93 lines
2.0 KiB
Go
93 lines
2.0 KiB
Go
package main
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import (
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"encoding/json"
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"log"
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"net/http"
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"runtime"
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"sync/atomic"
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"time"
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)
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var rc *rateCalculator
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func statusService(addr string) {
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rc = newRateCalculator(360, 10*time.Second, &bytesProxied)
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http.HandleFunc("/status", getStatus)
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if err := http.ListenAndServe(addr, nil); err != nil {
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log.Fatal(err)
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}
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}
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func getStatus(w http.ResponseWriter, r *http.Request) {
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status := make(map[string]interface{})
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sessionMut.Lock()
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status["numSessions"] = len(sessions)
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sessionMut.Unlock()
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status["numConnections"] = atomic.LoadInt64(&numConnections)
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status["numProxies"] = atomic.LoadInt64(&numProxies)
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status["bytesProxied"] = atomic.LoadInt64(&bytesProxied)
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status["goVersion"] = runtime.Version()
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status["goOS"] = runtime.GOOS
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status["goAarch"] = runtime.GOARCH
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status["goMaxProcs"] = runtime.GOMAXPROCS(-1)
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status["kbps10s1m5m15m30m60m"] = []int64{
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rc.rate(10/10) * 8 / 1000,
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rc.rate(60/10) * 8 / 1000,
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rc.rate(5*60/10) * 8 / 1000,
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rc.rate(15*60/10) * 8 / 1000,
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rc.rate(30*60/10) * 8 / 1000,
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rc.rate(60*60/10) * 8 / 1000,
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}
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bs, err := json.MarshalIndent(status, "", " ")
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.Write(bs)
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}
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type rateCalculator struct {
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rates []int64
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prev int64
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counter *int64
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}
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func newRateCalculator(keepIntervals int, interval time.Duration, counter *int64) *rateCalculator {
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r := &rateCalculator{
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rates: make([]int64, keepIntervals),
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counter: counter,
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}
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go r.updateRates(interval)
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return r
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}
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func (r *rateCalculator) updateRates(interval time.Duration) {
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for {
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now := time.Now()
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next := now.Truncate(interval).Add(interval)
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time.Sleep(next.Sub(now))
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cur := atomic.LoadInt64(r.counter)
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rate := int64(float64(cur-r.prev) / interval.Seconds())
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copy(r.rates[1:], r.rates)
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r.rates[0] = rate
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r.prev = cur
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}
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}
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func (r *rateCalculator) rate(periods int) int64 {
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var tot int64
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for i := 0; i < periods; i++ {
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tot += r.rates[i]
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}
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return tot / int64(periods)
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}
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