tracker/server/stats.go

// Copyright 2013 The Chihaya Authors. All rights reserved.
// Use of this source code is governed by the BSD 2-Clause license,
// which can be found in the LICENSE file.

package server

import (
	"encoding/json"
	"net/http"
	"sync/atomic"
	"time"

	"github.com/pushrax/chihaya/config"
)

type stats struct {
	Uptime config.Duration `json:"uptime"`
	RPM    int64           `json:"req_per_min"`
}

func (s *Server) serveStats(w http.ResponseWriter, r *http.Request) {
	stats, _ := json.Marshal(&stats{
		config.Duration{time.Now().Sub(s.startTime)},
		s.rpm,
	})

	length, _ := w.Write(stats)
	w.Header().Set("Content-Type", "application/json")
	w.Header().Set("Content-Length", string(length))
	w.Header().Set("Connection", "close")
	w.(http.Flusher).Flush()
}

func (s *Server) updateStats() {
	for _ = range time.NewTicker(time.Minute).C {
		s.rpm = s.deltaRequests
		atomic.StoreInt64(&s.deltaRequests, 0)
	}
}