mostly working addWatchArea system, somehow wont actually add the watcharea to the WatchAreas list in a Strea, goroutine problem?

main.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"encoding/json"
+	"image"
+	"image/color"
 	"io/ioutil"
 	"log"
 	"net/http"
@@ -39,6 +41,7 @@ func (server Server) index(w http.ResponseWriter, r *http.Request) {
 		log.Fatal(err)
 	}
 	streamTemplate.Execute(w, stream)
+	log.Println(server.Streams)
 }
 
 func (server Server) addStream(w http.ResponseWriter, r *http.Request) {
@@ -77,7 +80,66 @@ func (server Server) addStream(w http.ResponseWriter, r *http.Request) {
 }
 
 func (server Server) addWatchArea(w http.ResponseWriter, r *http.Request) {
-
+	if r.Method != "POST" {
+		//return
+	}
+	streamName := r.FormValue("streamName")
+	if streamName == "" {
+		return
+	}
+	stream, exists := server.Streams[streamName]
+	if !exists {
+		return
+	}
+	name := r.FormValue("name")
+	if name == "" {
+		return
+	}
+	x0 := r.FormValue("x0")
+	if x0 == "" {
+		return
+	}
+	y0 := r.FormValue("y0")
+	if y0 == "" {
+		return
+	}
+	x1 := r.FormValue("x1")
+	if x1 == "" {
+		return
+	}
+	y1 := r.FormValue("y1")
+	if y1 == "" {
+		return
+	}
+	R := r.FormValue("R")
+	if R == "" {
+		return
+	}
+	G := r.FormValue("G")
+	if G == "" {
+		return
+	}
+	B := r.FormValue("B")
+	if B == "" {
+		return
+	}
+	stream.WatchAreas = append(stream.WatchAreas, WatchArea{
+		Name: name,
+		Color: color.RGBA{
+			uint8(StrToInt(R)),
+			uint8(StrToInt(G)),
+			uint8(StrToInt(B)),
+			255,
+		},
+		Area: image.Rect(
+			StrToInt(x0),
+			StrToInt(y0),
+			StrToInt(x1),
+			StrToInt(y1),
+		),
+	})
+	stream.WriteStreamJSON()
+	http.Redirect(w, r, "/?name="+streamName, http.StatusTemporaryRedirect)
 }
 
 func main() {

stream.go

@@ -174,6 +174,11 @@ func (s Stream) SwapInstants(previous string, current string, next string) {
 	}
 }
 
+// AddWatchArea adds the given WatchArea to the list of WatchAreas
+func (s Stream) AddWatchArea(watchArea WatchArea) {
+	s.WatchAreas = append(s.WatchAreas, watchArea)
+}
+
 // GetStreamJSONPath returns filepath.Join(s.GetStreamStoreDirPath(), "stream.json")
 func (s Stream) GetStreamJSONPath() string {
 	return filepath.Join(s.GetStreamStoreDirPath(), "stream.json")

templates/stream.html

@@ -11,6 +11,7 @@
     <img src="{{ .GetCurrentURL }}" width="425" height="240">
 </div>
 <form action="/addWatchArea" method="GET" id="newWatchAreaForm">
+    <input type="hidden" name="streamName" value="{{ .Name }}">
     <table class="pure-table pure-table-horizontal">
         <caption>Watches</caption>
         <thead>

util.go

@@ -3,8 +3,10 @@ package main
 import (
 	"crypto/sha256"
 	"encoding/base64"
+	"log"
 	"os"
 	"path/filepath"
+	"strconv"
 )
 
 // URLToBase64 returns the base64 encoding of the URL parameter
@@ -35,3 +37,12 @@ func GetStreamDirPath() string {
 func StreamStorePathExists() bool {
 	return FileExists(GetStreamDirPath())
 }
+
+// StrToInt uses strconv.ParseInt
+func StrToInt(str string) int {
+	i, err := strconv.ParseInt(str, 10, 64)
+	if err != nil {
+		log.Println("Could not convert string to int ", str)
+	}
+	return int(i)
+}