add 100 max retries

README.md

@@ -13,6 +13,7 @@ screen](https://gitea.bubbletea.dev/shibao/szuru-eink-bot/raw/branch/master/eink
 - Fetches random images from a configurable Szurubooru instance.
 - Resizes and dithered images for e-ink display compatibility.
 - Supports monochrome and color dithering (for compatible displays).
+- Filters images by an optional allowed username.
 - Uploads processed images to a Waveshare e-ink screen.
 - Configurable via environment variables.
 - Designed to run as a Docker container on a cron job.
@@ -41,7 +42,9 @@ display.
 
 **Note:** For `EPD_TYPE`, refer to the `epd/epd_config.py` file for a full list
 of supported display types and their corresponding string labels. For color
-displays, ensure `DITHERING_MODE` is set to `color`.
+displays, ensure `DITHERING_MODE` is set to `color`. The bot
+will retry a maximum of 100 times to find a valid image (matching the user filter,
+if provided) before giving up.
 
 ### 3. Build and Run with Docker Compose
 

szuru-eink.py

@@ -26,7 +26,10 @@ booru = pyszuru.API(szuru_url, username=szuru_user, token=szuru_token)
 highest_post = next(booru.search_post("sort:id type:image", page_size=1))
 
 post = None
-while post is None:
+retries = 0
+MAX_RETRIES = 100
+
+while post is None and retries < MAX_RETRIES:
     random_id = random.randint(0, highest_post.id_)
     try:
         temp_post = booru.getPost(random_id)
@@ -42,8 +45,12 @@ while post is None:
         print(f"[DEBUG] Found image post with ID: {post.id_}, MIME: {post.mime}")
     else:
         print(
-            f"[DEBUG] Skipping post ID: {random_id} (MIME: {temp_post.mime if temp_post else 'None'}, Content: {bool(temp_post.content) if temp_post else 'None'}) - not a valid image."
+            f"[DEBUG] Skipping post ID: {random_id} (MIME: {temp_post.mime if temp_post else 'None'}, Content: {bool(temp_post.content) if temp_post else 'None'}) - not a valid image. (Retry {retries + 1}/{MAX_RETRIES})"
         )
+        retries += 1
+
+if post is None:
+    raise RuntimeError(f"Failed to find a valid post after {MAX_RETRIES} retries.")
 
 # download image
 image_downloaded = False
@@ -72,7 +79,7 @@ while not image_downloaded:
             os.remove("image.jpg")
         # Find a new post
         post = None
-        while post is None:
+        while post is None and retries < MAX_RETRIES:
             random_id = random.randint(0, highest_post.id_)
             try:
                 temp_post = booru.getPost(random_id)
@@ -90,7 +97,13 @@ while not image_downloaded:
                 )
             else:
                 print(
-                    f"[DEBUG] Skipping post ID: {random_id} (MIME: {temp_post.mime if temp_post else 'None'}, Content: {bool(temp_post.content) if temp_post else 'None'}) - not a valid image."
+                    f"[DEBUG] Skipping post ID: {random_id} (MIME: {temp_post.mime if temp_post else 'None'}, Content: {bool(temp_post.content) if temp_post else 'None'}) - not a valid image. (Retry {retries + 1}/{MAX_RETRIES})"
+                )
+                retries += 1
+
+        if post is None:
+            raise RuntimeError(
+                f"Failed to find a valid post after {MAX_RETRIES} retries."
             )
 
     # Process and upload