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//
// sfive
//
// sfive - spreadspace streaming statistics suite is a generic
// statistic collection tool for streaming server infrastuctures.
// The system collects and stores meta data like number of views
// and throughput from a number of streaming servers and stores
// it in a global data store.
// The data acquisition is designed to be generic and extensible in
// order to support different streaming software.
// sfive also contains tools and applications to filter and visualize
// live and recorded data.
//
//
// Copyright (C) 2014-2016 Christian Pointner <equinox@spreadspace.org>
// Markus Grüneis <gimpf@gimpf.org>
//
// This file is part of sfive.
//
// sfive is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3
// as published by the Free Software Foundation.
//
// sfive is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with sfive. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"errors"
"fmt"
"net"
"os"
"strings"
"time"
)
// TODO: this is basically a copy from src/hub....
type StreamID struct {
ContentID string `json:"content-id"`
Format string `json:"format"`
Quality string `json:"quality"`
}
type ClientData struct {
IP string `json:"ip"`
UserAgent string `json:"user-agent"`
BytesSent uint `json:"bytes-sent"`
}
type SourceData struct {
ClientCount uint `json:"client-count"`
BytesReceived uint `json:"bytes-received"`
BytesSent uint `json:"bytes-sent"`
Clients []ClientData `json:"clients,omitempty"`
}
type DataUpdate struct {
Version uint `json:"version"`
Hostname string `json:"hostname"`
StreamID StreamID `json:"streamer-id"`
Tags []string `json:"tags,omitempty"`
StartTime time.Time `json:"start-time"`
Duration int64 `json:"duration-ms"`
Data SourceData `json:"data"`
}
type StatsWorker struct {
stream StreamID
current map[string]*ClientData
trigger chan time.Time
output chan<- *DataUpdate
input chan *ClientData
}
func NewStatsWorker(stream StreamID, updates chan<- *DataUpdate) (sw StatsWorker) {
sw.stream = stream
sw.current = make(map[string]*ClientData)
sw.trigger = make(chan time.Time)
sw.output = updates
sw.input = make(chan *ClientData, 100)
return
}
func (sw StatsWorker) Run() {
for {
select {
case t := <-sw.trigger:
if t.UnixNano() != 0 {
upd := &DataUpdate{StreamID: sw.stream, StartTime: t}
upd.Data.ClientCount = uint(len(sw.current))
for _, c := range sw.current {
upd.Data.Clients = append(upd.Data.Clients, *c)
upd.Data.BytesSent += c.BytesSent
}
sw.output <- upd
}
sw.current = make(map[string]*ClientData)
case upd := <-sw.input:
if data, exists := sw.current[upd.IP]; exists {
data.BytesSent += upd.BytesSent
} else {
sw.current[upd.IP] = upd
}
}
}
}
type Stats struct {
conf *Config
sock net.Conn
updates chan *DataUpdate
workers map[string]StatsWorker
}
func (s *Stats) GetUpdateChannel(url string) chan<- *ClientData {
s5l.Printf("STATS: got new client for url: %s", url)
for name, worker := range s.workers {
if strings.Contains(url, name) {
return worker.input
}
}
return nil
}
func parseStreamerDescriptionElement(desc, desctype string) (e []string, err error) {
parts := strings.Split(desc, ",")
for _, p := range parts {
if p = strings.TrimSpace(p); p == "" {
err = fmt.Errorf("invalid streamer description %s: '%s'", desctype, desc)
return
}
e = append(e, p)
}
return
}
func parseStreamerDescription(desc string) (c, f, q []string, err error) {
parts := strings.Split(desc, "/")
if len(parts) != 3 {
err = fmt.Errorf("invalid streamer description: '%s'", desc)
return
}
if c, err = parseStreamerDescriptionElement(parts[0], "content-id"); err != nil {
return
}
if f, err = parseStreamerDescriptionElement(parts[1], "format"); err != nil {
return
}
if q, err = parseStreamerDescriptionElement(parts[2], "quality"); err != nil {
return
}
return
}
func generateStreamerName(format, c, f, q string) string {
return os.Expand(format, func(k string) string {
switch k {
case "content-id":
return c
case "format":
return f
case "quality":
return q
default:
return ""
}
})
}
func NewStats(conf *Config) (s *Stats, err error) {
s = &Stats{conf: conf}
if s.sock, err = net.DialTimeout("unixgram", conf.SFive.Sock, time.Second); err != nil {
return
}
s5l.Printf("STATS: connected to sfive-hub on '%s'", conf.SFive.Sock)
s.updates = make(chan *DataUpdate, 100)
s.workers = make(map[string]StatsWorker)
var content, format, quality []string
for _, desc := range conf.SFive.Streamer {
if content, format, quality, err = parseStreamerDescription(desc); err != nil {
return
}
for _, c := range content {
for _, f := range format {
for _, q := range quality {
name := generateStreamerName(conf.SFive.Format, c, f, q)
s.workers[name] = NewStatsWorker(StreamID{c, f, q}, s.updates)
s5l.Printf("STATS: adding streamer '%s'", name)
}
}
}
}
if len(s.workers) < 1 {
err = errors.New("no streamers defined")
return
}
return
}
func (s *Stats) Run() (err error) {
for _, worker := range s.workers {
go worker.Run()
}
d := time.Duration(s.conf.SFive.Duration) * time.Millisecond
offset := d - (time.Duration(time.Now().UnixNano()) % d)
s5l.Printf("STATS: waiting %v for the next duration boundary", offset)
time.Sleep(offset)
s5l.Printf("STATS: starting ticker")
ticker := time.NewTicker(d)
for _, worker := range s.workers {
worker.trigger <- time.Unix(0, 0) // stats-worker will not send data but just reset
}
for {
select {
case t := <-ticker.C:
t = t.Add(-1 * d)
for _, worker := range s.workers {
worker.trigger <- t
}
case upd := <-s.updates:
upd.Version = 1
upd.Hostname = s.conf.SFive.Hostname
upd.Tags = s.conf.SFive.Tags
upd.Duration = int64(s.conf.SFive.Duration)
s5l.Printf("STATS: got data update for '%v'", upd)
// TODO: send it out on socket
// TODO: if sock error ... try reconnect
}
}
return
}
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