Update now gets a new instant (not with GetStreamInstant) and uses SaveStreamInstant to save

main.go

@@ -61,7 +61,7 @@ func (server Server) stream(w http.ResponseWriter, r *http.Request) {
 	gocv.CvtColor(diff, &diff, gocv.ColorBGRAToGray)
 	gocv.GaussianBlur(diff, &diff, image.Point{X: 21, Y: 21}, 0, 0, gocv.BorderReflect)
 
-	go stream.SaveStreamInstant(URL, mat)
+	go stream.SaveStreamInstant(mat)
 
 	if stream.PreviousInstantPathExists() {
 		previous := stream.IMReadPrevious()

stream.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/json"
+	"image"
 	"io/ioutil"
 	"log"
 	"net/http"
@@ -35,6 +36,21 @@ func NewStream(URL string) Stream {
 // Update calls itself every Interval milliseconds
 func (s Stream) Update() {
 	log.Print("Update:", s.URL)
+	resp, err := http.Get(s.URL)
+	if err != nil {
+		log.Fatal(err)
+	}
+	img, err := ioutil.ReadAll(resp.Body)
+	defer resp.Body.Close()
+
+	mat, err := gocv.IMDecode(img, gocv.IMReadGrayScale)
+	if err != nil {
+		log.Fatal("Could not IMDecode img")
+	}
+
+	gocv.GaussianBlur(mat, &mat, image.Point{X: 21, Y: 21}, 0, 0, gocv.BorderReflect)
+
+	go s.SaveStreamInstant(mat)
 }
 
 // UpdateInterval calls Update() every interval
@@ -63,7 +79,7 @@ func (s Stream) GetStreamInstant() gocv.Mat {
 }
 
 // SaveStreamInstant writes the img to the CurrentStreamInstantPath, moves existing instant to PreviousStreamInstantPath
-func (s Stream) SaveStreamInstant(URL string, mat gocv.Mat) {
+func (s Stream) SaveStreamInstant(mat gocv.Mat) {
 	streamStoreDir := s.GetStreamStoreDirPath()
 	os.MkdirAll(streamStoreDir, os.ModePerm)