feat(websocket): submissions backend

polylan_submitter/submissions/signals.py

@@ -0,0 +1,67 @@
+import json
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from asgiref.sync import async_to_sync
+from channels.layers import get_channel_layer
+
+from submissions.models import Submission, SubmissionFile, ImageCrop
+from submissions.schemas import SubmissionOut, SubmissionFileOut, ImageCropOut
+
+
+channel_layer = get_channel_layer()
+
+
+@receiver(post_save, sender=Submission)
+def broadcast_submission_update(sender, instance, created, **kwargs):
+    if not instance.user:
+        return
+
+    user_group_name = f"submissions_user_{instance.user.id}"
+    schema = SubmissionOut.model_validate(instance)
+    submission_data = schema.model_dump(mode="json")
+
+    async_to_sync(channel_layer.group_send)(
+        user_group_name,
+        {
+            "type": "submission.updated",
+            "submission": submission_data,
+        }
+    )
+
+
+@receiver(post_save, sender=SubmissionFile)
+def broadcast_submission_file_update(sender, instance, created, **kwargs):
+    submission = instance.submission
+    if not submission.user:
+        return
+
+    user_group_name = f"submissions_user_{submission.user.id}"
+    schema = SubmissionFileOut.model_validate(instance)
+    file_data = schema.model_dump(mode="json")
+
+    async_to_sync(channel_layer.group_send)(
+        user_group_name,
+        {
+            "type": "submission.file.updated",
+            "file": file_data,
+        }
+    )
+
+
+@receiver(post_save, sender=ImageCrop)
+def broadcast_image_crop_update(sender, instance, created, **kwargs):
+    submission = instance.submission_file.submission
+    if not submission.user:
+        return
+
+    user_group_name = f"submissions_user_{submission.user.id}"
+    schema = ImageCropOut.model_validate(instance)
+    crop_data = schema.model_dump(mode="json")
+
+    async_to_sync(channel_layer.group_send)(
+        user_group_name,
+        {
+            "type": "submission.crop.updated",
+            "crop": crop_data,
+        }
+    )