added mutex to SaveStreamInstant to prevent weirdness

stream.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"sync"
 	"time"
 
 	"gocv.io/x/gocv"
@@ -18,6 +19,7 @@ type Stream struct {
 	URL      string `json:"url"`
 	Base64   string `json:"base64"`
 	Interval int    `json:"interval"`
+	FileLock sync.Mutex
 }
 
 // NewStream creates a new Stream Object
@@ -80,6 +82,7 @@ func (s Stream) GetStreamInstant() gocv.Mat {
 
 // SaveStreamInstant writes the img to the CurrentStreamInstantPath, moves existing instant to PreviousStreamInstantPath
 func (s Stream) SaveStreamInstant(mat gocv.Mat) {
+	s.FileLock.Lock()
 	streamStoreDir := s.GetStreamStoreDirPath()
 	os.MkdirAll(streamStoreDir, os.ModePerm)
 
@@ -95,6 +98,7 @@ func (s Stream) SaveStreamInstant(mat gocv.Mat) {
 	if swap {
 		s.SwapInstants(s.GetPreviousInstantPath(), s.GetCurrentInstantPath(), s.GetNextInstantPath())
 	}
+	s.FileLock.Unlock()
 }
 
 // SwapInstants swaps the file location, first current -> previous and then next -> current