Added/deleted-type websocket messages

Events are now sent for not only when an object changes but also when one is created or deleted.

For now it's not really possible to subscribe to these events however.

This breaks backwards-compatibility with the websocket messages.

spoolman/database/vendor.py

@@ -6,7 +6,7 @@ from typing import Optional
 from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from spoolman.api.v1.models import Vendor
+from spoolman.api.v1.models import EventType, Vendor, VendorEvent
 from spoolman.database import models
 from spoolman.database.utils import SortOrder, add_where_clause_str
 from spoolman.exceptions import ItemNotFoundError
@@ -20,14 +20,15 @@ async def create(
     comment: Optional[str] = None,
 ) -> models.Vendor:
     """Add a new vendor to the database."""
-    db_item = models.Vendor(
+    vendor = models.Vendor(
         name=name,
         registered=datetime.utcnow().replace(microsecond=0),
         comment=comment,
     )
-    db.add(db_item)
+    db.add(vendor)
     await db.commit()
-    return db_item
+    await vendor_changed(vendor, EventType.ADDED)
+    return vendor
 
 
 async def get_by_id(db: AsyncSession, vendor_id: int) -> models.Vendor:
@@ -89,7 +90,7 @@ async def update(
     for k, v in data.items():
         setattr(vendor, k, v)
     await db.commit()
-    await vendor_changed(vendor)
+    await vendor_changed(vendor, EventType.UPDATED)
     return vendor
 
 
@@ -97,8 +98,16 @@ async def delete(db: AsyncSession, vendor_id: int) -> None:
     """Delete a vendor object."""
     vendor = await get_by_id(db, vendor_id)
     await db.delete(vendor)
+    await vendor_changed(vendor, EventType.DELETED)
 
 
-async def vendor_changed(vendor: models.Vendor) -> None:
+async def vendor_changed(vendor: models.Vendor, typ: EventType) -> None:
     """Notify websocket clients that a vendor has changed."""
-    await websocket_manager.send(("vendor", str(vendor.id)), Vendor.from_db(vendor).json())
+    await websocket_manager.send(
+        ("vendor", str(vendor.id)),
+        VendorEvent(
+            type=typ,
+            date=datetime.utcnow(),
+            payload=Vendor.from_db(vendor),
+        ),
+    )