From 5f2c46fe5252a51cb565e6e6227b984b65556d88 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Sat, 15 Oct 2016 04:27:48 +0200
Subject: external interface for statistics module done.

---
 src/daq/s5proxy/src/s5proxy/proxy.go   | 29 ++++++++++++++++++++++++-----
 src/daq/s5proxy/src/s5proxy/s5proxy.go | 19 ++++++++++++++++---
 src/daq/s5proxy/src/s5proxy/stats.go   | 31 +++++++++++++++++++++++++------
 3 files changed, 65 insertions(+), 14 deletions(-)

diff --git a/src/daq/s5proxy/src/s5proxy/proxy.go b/src/daq/s5proxy/src/s5proxy/proxy.go
index 33cbc14..26ce8f7 100644
--- a/src/daq/s5proxy/src/s5proxy/proxy.go
+++ b/src/daq/s5proxy/src/s5proxy/proxy.go
@@ -51,8 +51,11 @@ func generateTime(input string) string {
 }
 
 type s5proxyResponseWriter struct {
-	wrapped http.ResponseWriter
-	conf    *Config
+	wrapped   http.ResponseWriter
+	conf      *Config
+	StatsCh   chan<- ClientData
+	IP        string
+	UserAgent string
 }
 
 func (r s5proxyResponseWriter) Header() http.Header {
@@ -60,7 +63,15 @@ func (r s5proxyResponseWriter) Header() http.Header {
 }
 
 func (r s5proxyResponseWriter) Write(data []byte) (int, error) {
-	return r.wrapped.Write(data)
+	sent, err := r.wrapped.Write(data)
+	if r.StatsCh != nil {
+		stats := ClientData{IP: r.IP, UserAgent: r.UserAgent, BytesSent: uint(sent)}
+		select {
+		case r.StatsCh <- stats:
+		default:
+		}
+	}
+	return sent, err
 }
 
 func (r s5proxyResponseWriter) WriteHeader(status int) {
@@ -83,19 +94,27 @@ func (r s5proxyResponseWriter) WriteHeader(status int) {
 
 func proxyHandler(p *Proxy, w http.ResponseWriter, r *http.Request) {
 	pw := s5proxyResponseWriter{wrapped: w, conf: p.conf}
+	if p.stats != nil {
+		//pw.IP, _, _ = net.SplitHostPort(r.RemoteAddr)
+		pw.IP = r.RemoteAddr // Use IP:Port for now since IP alone might not be unique
+		pw.UserAgent = r.UserAgent()
+		pw.StatsCh = p.stats.GetUpdateChannel(r.URL.String())
+	}
+
 	p.proxy.ServeHTTP(pw, r)
 }
 
 type Proxy struct {
 	conf  *Config
+	stats *Stats
 	proxy *httputil.ReverseProxy
 	mux   *http.ServeMux
 	srv   *http.Server
 }
 
-func NewProxy(conf *Config) (p *Proxy, err error) {
+func NewProxy(conf *Config, stats *Stats) (p *Proxy, err error) {
 
-	p = &Proxy{conf: conf}
+	p = &Proxy{conf: conf, stats: stats}
 
 	var remote *url.URL
 	remote, err = url.Parse(conf.ConnectAddr)
diff --git a/src/daq/s5proxy/src/s5proxy/s5proxy.go b/src/daq/s5proxy/src/s5proxy/s5proxy.go
index 47ba8b7..6d267c8 100644
--- a/src/daq/s5proxy/src/s5proxy/s5proxy.go
+++ b/src/daq/s5proxy/src/s5proxy/s5proxy.go
@@ -60,16 +60,29 @@ func main() {
 		os.Exit(1)
 	}
 
+	var stats *Stats
+	// TODO: make this configurable
+	stats, err = NewStats(conf)
+
 	var proxy *Proxy
-	proxy, err = NewProxy(conf)
+	proxy, err = NewProxy(conf, stats)
 
 	done := make(chan bool)
 
+	if stats != nil {
+		go func() {
+			defer func() { done <- true }()
+			s5l.Println("starting sfive-stats-module")
+			stats.Run()
+			s5l.Println("ERROR: sfive-stats-module stopped")
+		}()
+	}
+
 	go func() {
 		defer func() { done <- true }()
-		s5l.Println("start proxy")
+		s5l.Println("starting HTTP-Proxy")
 		proxy.Run()
-		s5l.Println("ERROR: proxy stopped")
+		s5l.Println("ERROR: HTTP-Proxy stopped")
 	}()
 
 	c := make(chan os.Signal, 1)
diff --git a/src/daq/s5proxy/src/s5proxy/stats.go b/src/daq/s5proxy/src/s5proxy/stats.go
index 4a9c775..8c16c77 100644
--- a/src/daq/s5proxy/src/s5proxy/stats.go
+++ b/src/daq/s5proxy/src/s5proxy/stats.go
@@ -33,8 +33,8 @@
 package main
 
 import (
-	"encoding/json"
-	"os"
+	//	"encoding/json"
+	//	"os"
 	"time"
 )
 
@@ -47,7 +47,7 @@ type StreamId struct {
 }
 
 type ClientData struct {
-	Ip        string `json:"ip"`
+	IP        string `json:"ip"`
 	UserAgent string `json:"user-agent"`
 	BytesSent uint   `json:"bytes-sent"`
 }
@@ -71,16 +71,35 @@ type DataUpdate struct {
 
 type Stats struct {
 	conf *Config
+
+	// TODO: create datastructure to hold update channels
+	updateCH chan ClientData
 }
 
 func NewStats(conf *Config) (s *Stats, err error) {
 	s = &Stats{conf: conf}
+
+	// TODO: create update-channels according to conf
+	s.updateCH = make(chan ClientData, 512)
 	return
 }
 
 func (s *Stats) Run() (err error) {
-	update := DataUpdate{Version: 1, Hostname: "hugo"}
-	update.Tags = append(update.Tags, "hello", "world")
-	err = json.NewEncoder(os.Stdout).Encode(update)
+	// update := DataUpdate{Version: 1, Hostname: "hugo"}
+	// update.Tags = append(update.Tags, "hello", "world")
+	// err = json.NewEncoder(os.Stdout).Encode(update)
+
+	for {
+		select {
+		case upd := <-s.updateCH:
+			s5l.Printf("STATS: got client data: IP: %s, UA: %s, %d Bytes", upd.IP, upd.UserAgent, upd.BytesSent)
+		}
+	}
 	return
 }
+
+func (s *Stats) GetUpdateChannel(url string) chan<- ClientData {
+	s5l.Printf("STATS: got new client for url: %s", url)
+
+	return s.updateCH
+}
-- 
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