update nest fetch flag to store only one photo

this is to avoid storing all images and potentially run out of disk

app.py

@@ -36,6 +36,8 @@
                         help="fetches last image from Nest cameras.", action='store_true')
     parser.add_argument("--repeat", required=False,
                         help="keeps fetching new images with the delay specified in seconds.", default=-1)
+    parser.add_argument("--store", required=False,
+                        help="keeps only one photo as the latest image.", default=True)
 
     # fetch Nest camera images and store them locally
     parser.add_argument("--picamera", required=False,
@@ -47,7 +49,7 @@
     # Get the arguments.
     if args.nest:
         print("[RUN] Fetching Nest images")
-        lib.nest.fetch(config, int(args.repeat))
+        lib.nest.fetch(config, int(args.repeat), args.store == "true")
 
     if args.picamera:
         print("[RUN] Fetching Raspberry Pi Camera images")

lib/nest.py

@@ -67,13 +67,16 @@ def resize_image(filename, destination_max_width=500, destination_max_height=500
     image.save(filename, "JPEG")
 
 
-def store_camera_image(token):
+def store_camera_image(token, store=True):
     try:
         print("Downloading image from cameras...")
         camera_images = fetch_snapshots_urls(token)
         for camera_key in camera_images:
             image_url = camera_images[camera_key]
-            filename = timestamp_filename()
+            if store:
+                filename = timestamp_filename()
+            else:
+                filename = "live.jpg"
             directory = "images/all/" + camera_key
             if not os.path.exists(directory):
                 os.makedirs(directory)
@@ -85,12 +88,12 @@ def store_camera_image(token):
         print("Exception trying to fetch camera image. Error: " + str(e))
 
 
-def fetch(config, repeat=-1):
+def fetch(config, repeat=-1, store=True):
     token = config.get("nest", "token")
     if repeat > 0:
         print("repeats every " + str(repeat) + " seconds.")
         while(True):
-            store_camera_image(token)
+            store_camera_image(token, store)
             time.sleep(repeat)
     else:
-        store_camera_image(token)
+        store_camera_image(token, store)

start.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-python app.py --nest --repeat 30 >nest.out 2>nest.err &
-python app.py --predict --repeat 90 >predict.out 2>predict.err &
+python app.py --nest --repeat 30 --store false >nest.out 2>nest.err &
+python app.py --predict --repeat 120 >predict.out 2>predict.err &
 python app.py --slack >slack.out 2>slack.err &
-python app.py --slack_changes --repeat 15 >slack_changes.out 2>slack_changes.err &
+python app.py --slack_changes --repeat 10 >slack_changes.out 2>slack_changes.err &