Reload only updated monitors

migrations/versions/202411181208_247390255aee_create_code_modules_table.py

@@ -24,6 +24,7 @@ def upgrade() -> None:
         sa.Column("monitor_id", sa.Integer(), unique=True),
         sa.Column("code", sa.String(), nullable=True),
         sa.Column("additional_files", sa.JSON, nullable=True),
+        sa.Column("registered_at", sa.DateTime(timezone=True), nullable=True),
 
         sa.ForeignKeyConstraint(("monitor_id",), ["Monitors.id"]),
     )

src/components/monitors_loader/monitors_loader.py

@@ -13,6 +13,7 @@
 from configs import configs
 from data_models.monitor_options import ReactionOptions
 from models import CodeModule, Monitor
+from utils.async_tools import do_concurrently
 from utils.exception_handling import catch_exceptions
 from utils.time import now, time_since, time_until_next_trigger
 
@@ -94,6 +95,7 @@ async def register_monitor(
     code_module = await CodeModule.get_or_create(monitor_id=monitor.id)
     code_module.code = monitor_code
     code_module.additional_files = additional_files or {}
+    code_module.registered_at = now()
     await code_module.save()
 
     return monitor
@@ -190,43 +192,84 @@ def _configure_monitor(monitor_module: MonitorModule) -> None:
             monitor_module.reaction_options[event_name].extend(reactions)
 
 
-async def _load_monitors() -> None:
-    """Load all enabled monitors from the database and add them to the registry. If any of the
-    monitor's modules fails to load, the monitor will not be added to the registry"""
-    registry.monitors_ready.clear()
+async def _disable_monitor(monitor: Monitor) -> None:
+    """Disable a monitor"""
+    await monitor.set_enabled(False)
+    _logger.warning(f"Monitor '{monitor}' has no code module, it will be disabled")
+
+
+async def _disable_monitors_without_code_modules() -> None:
+    """Disable all monitors that don't have a code module"""
+    enabled_monitors = await Monitor.get_raw([Monitor.id], [Monitor.enabled.is_(True)])
+    monitors_ids = {monitor_id for (monitor_id,) in enabled_monitors}
+
+    code_modules = await CodeModule.get_raw([CodeModule.monitor_id], [CodeModule.code.is_not(None)])
+    code_modules_monitor_ids = {monitor_id for (monitor_id,) in code_modules}
+
+    monitors_to_disable = await Monitor.get_all(
+        Monitor.id.in_(monitors_ids - code_modules_monitor_ids)
+    )
+    await do_concurrently(*[_disable_monitor(monitor) for monitor in monitors_to_disable])
 
+
+async def _get_monitors_to_load(
+    last_load_time: datetime | None,
+) -> tuple[dict[int, Monitor], list[CodeModule]]:
+    """Get all the monitors that need to be loaded"""
+    # Get all enabled monitors
     loaded_monitors = await Monitor.get_all(Monitor.enabled.is_(True))
-    monitors_ids = [monitor.id for monitor in loaded_monitors]
+    monitors = {monitor.id: monitor for monitor in loaded_monitors}
+
+    # Get all code modules that were updated since the last load time
+    # Add a time delta to have some room for code modules that updated right before the last load
+    if last_load_time is None:
+        reference_timestamp = None
+    else:
+        reference_timestamp = last_load_time - timedelta(seconds=15)
+
+    updated_code_modules = await CodeModule.get_updated_code_modules(
+        monitors_ids=list(monitors.keys()),
+        reference_timestamp=reference_timestamp,
+    )
+    code_modules = [code_module for code_module in updated_code_modules]
+
+    # Add monitors that are enabled but aren't in the registry
+    registry_monitors_ids = set(registry.get_monitors_ids())
+    update_monitors_ids = {code_module.monitor_id for code_module in updated_code_modules}
+    pending_monitors = set(monitors.keys()) - registry_monitors_ids - update_monitors_ids
+    if len(pending_monitors) > 0:
+        code_modules.extend(await CodeModule.get_all(CodeModule.monitor_id.in_(pending_monitors)))
+
+    return monitors, code_modules
 
-    code_modules = await CodeModule.get_all(CodeModule.monitor_id.in_(monitors_ids))
-    code_modules_map = {code_module.monitor_id: code_module for code_module in code_modules}
 
-    _logger.info(f"Monitors found: {len(loaded_monitors)}")
+async def _load_monitors(last_load_time: datetime | None) -> None:
+    """Load all enabled monitors from the database and add them to the registry. If any of the
+    monitor's modules fails to load, the monitor will not be added to the registry"""
+    registry.monitors_ready.clear()
+
+    monitors, code_modules = await _get_monitors_to_load(last_load_time)
+    _logger.info(f"Monitors to load: {len(code_modules)}")
 
     # To load the monitors safely, first create all the files and then import them
     # Loading right after writing the files can result in an error where the Monitor module is not
     # found
     monitors_paths = {}
-    for monitor in loaded_monitors:
+    for code_module in code_modules:
         with catch_exceptions(_logger):
-            code_module = code_modules_map.get(monitor.id)
-            if code_module is None:
-                await monitor.set_enabled(False)
-                _logger.warning(f"Monitor '{monitor.name}' has no code module, it will be disabled")
-                continue
+            monitor = monitors[code_module.monitor_id]
 
             monitors_paths[monitor.id] = module_loader.create_module_files(
                 module_name=monitor.name,
                 module_code=code_module.code,
                 additional_files=code_module.additional_files,
             )
 
-    for monitor in loaded_monitors:
+    for code_module in code_modules:
         with catch_exceptions(_logger):
-            monitor_path = monitors_paths.get(monitor.id)
-            if monitor_path is None:
-                continue
+            monitor = monitors[code_module.monitor_id]
 
+            monitor_path = monitors_paths[monitor.id]
             monitor_module = cast(MonitorModule, module_loader.load_module_from_file(monitor_path))
             _configure_monitor(monitor_module)
 
@@ -238,11 +281,12 @@ async def _load_monitors() -> None:
 
 async def _run() -> None:
     """Monitors loading loop, loading them recurrently. Stops automatically when the app stops"""
-    last_load_time: datetime
+    last_load_time: datetime | None = None
 
     while app.running():
         with catch_exceptions(_logger):
-            await _load_monitors()
+            await _disable_monitors_without_code_modules()
+            await _load_monitors(last_load_time)
             last_load_time = now()
 
             # The sleep task will start seconds earlier to try to load all monitors before the

src/models/code_module.py

@@ -1,4 +1,7 @@
-from sqlalchemy import ForeignKey, Integer, String
+from datetime import datetime
+from typing import Sequence
+
+from sqlalchemy import DateTime, ForeignKey, Integer, String
 from sqlalchemy.dialects import postgresql
 from sqlalchemy.ext.mutable import MutableDict
 from sqlalchemy.orm import Mapped, mapped_column
@@ -16,6 +19,25 @@ class CodeModule(Base):
         MutableDict.as_mutable(postgresql.JSON),  # type: ignore[arg-type]
         nullable=True,
     )
+    registered_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=True)
 
     # Code modules won't trigger events when they are created
     _enable_creation_event: bool = False
+
+    @classmethod
+    async def get_updated_code_modules(
+        cls: type["CodeModule"],
+        monitors_ids: list[int],
+        reference_timestamp: datetime | None,
+    ) -> Sequence["CodeModule"]:
+        """Get all code modules that were updated after a reference timestamp"""
+        if not monitors_ids:
+            return []
+
+        if reference_timestamp is None:
+            return await cls.get_all(cls.monitor_id.in_(monitors_ids))
+
+        return await cls.get_all(
+            cls.monitor_id.in_(monitors_ids),
+            cls.registered_at > reference_timestamp,
+        )

src/registry/__init__.py

@@ -3,6 +3,7 @@
     add_monitor,
     get_monitor_module,
     get_monitors,
+    get_monitors_ids,
     init,
     is_monitor_registered,
     monitors_pending,
@@ -16,6 +17,7 @@
     "MonitorsLoadError",
     "add_monitor",
     "get_monitor_module",
+    "get_monitors_ids",
     "get_monitors",
     "init",
     "is_monitor_registered",

src/registry/registry.py

@@ -76,6 +76,11 @@ async def wait_monitor_loaded(monitor_id: int) -> None:
         raise MonitorNotRegisteredError(f"Monitor '{monitor_id}' not registered")
 
 
+def get_monitors_ids() -> list[int]:
+    """Get all the monitors"""
+    return list(_monitors.keys())
+
+
 def get_monitors() -> list[MonitorInfo]:
     """Get all the monitors"""
     return list(_monitors.values())

tests/components/controller/test_controller.py

@@ -338,7 +338,7 @@ async def test_run(monkeypatch, clear_queue, clear_database):
     assert len(queue_items) == 0
 
     # Load the monitors and wait for a while
-    await monitors_loader._load_monitors()
+    await monitors_loader._load_monitors(None)
     await asyncio.sleep(0.2)
 
     # Stop the app and wait for the controller task
@@ -399,7 +399,7 @@ async def test_run_monitors_not_ready(caplog, monkeypatch, mocker):
 
     # Run the controller for a while then stop it
     await monitors_loader._register_monitors()
-    await monitors_loader._load_monitors()
+    await monitors_loader._load_monitors(None)
     registry.monitors_ready.clear()
 
     controller_task = asyncio.create_task(controller.run())
@@ -419,7 +419,7 @@ async def test_run_monitors_not_registered(caplog, monkeypatch, mocker):
 
     # Run the controller for a while then stop it
     await monitors_loader._register_monitors()
-    await monitors_loader._load_monitors()
+    await monitors_loader._load_monitors(None)
 
     controller_task = asyncio.create_task(controller.run())
     await asyncio.sleep(0.2)
@@ -442,7 +442,7 @@ def error(*args):
     # Run the controller for a while then stop it
     await monitors_loader._register_monitors()
     controller_task = asyncio.create_task(controller.run())
-    await monitors_loader._load_monitors()
+    await monitors_loader._load_monitors(None)
     await asyncio.sleep(0.3)
 
     assert_message_in_log(caplog, "ValueError: Not able to get the monitors")