Run update call on recurring schedule

Call to the update service every four hours, and use the BE origin type.
Print a warning level log message if an update is available.

This PR also introduces some refactoring from the previous PR:

1) Refactor the update client to be a singleton.
2) Set the instance ID once on application load.
3) Get rid of the feature flag - using the new service is now default.

src/codegate/api/v1.py

@@ -1,17 +1,18 @@
 from typing import List, Optional
 from uuid import UUID
 
+import cachetools.func
 import requests
 import structlog
 from fastapi import APIRouter, Depends, HTTPException, Query, Response
 from fastapi.responses import StreamingResponse
 from fastapi.routing import APIRoute
 from pydantic import BaseModel, ValidationError
 
-from codegate.config import API_DEFAULT_PAGE_SIZE, API_MAX_PAGE_SIZE
 import codegate.muxing.models as mux_models
-from codegate import Config, __version__
+from codegate import __version__
 from codegate.api import v1_models, v1_processing
+from codegate.config import API_DEFAULT_PAGE_SIZE, API_MAX_PAGE_SIZE
 from codegate.db.connection import AlreadyExistsError, DbReader
 from codegate.db.models import AlertSeverity, AlertTriggerType, Persona, WorkspaceWithModel
 from codegate.muxing.persona import (
@@ -20,7 +21,7 @@
     PersonaSimilarDescriptionError,
 )
 from codegate.providers import crud as provendcrud
-from codegate.updates.client import Origin, UpdateClient
+from codegate.updates.client import Origin, get_update_client_singleton
 from codegate.workspaces import crud
 
 logger = structlog.get_logger("codegate")
@@ -32,7 +33,6 @@
 
 # This is a singleton object
 dbreader = DbReader()
-update_client = UpdateClient(Config.get_config().update_service_url, __version__, dbreader)
 
 
 def uniq_name(route: APIRoute):
@@ -728,10 +728,7 @@ async def stream_sse():
 @v1.get("/version", tags=["Dashboard"], generate_unique_id_function=uniq_name)
 async def version_check():
     try:
-        if Config.get_config().use_update_service:
-            latest_version = await update_client.get_latest_version(Origin.FrontEnd)
-        else:
-            latest_version = v1_processing.fetch_latest_version()
+        latest_version = __get_latest_version()
         # normalize the versions as github will return them with a 'v' prefix
         current_version = __version__.lstrip("v")
         latest_version_stripped = latest_version.lstrip("v")
@@ -885,3 +882,9 @@ async def delete_persona(persona_name: str):
     except Exception:
         logger.exception("Error while deleting persona")
         raise HTTPException(status_code=500, detail="Internal server error")
+
+
+@cachetools.func.ttl_cache(maxsize=128, ttl=20 * 60)
+def __get_latest_version():
+    update_client = get_update_client_singleton()
+    return update_client.get_latest_version(Origin.FrontEnd)

src/codegate/api/v1_processing.py

@@ -3,9 +3,7 @@
 from collections import defaultdict
 from typing import AsyncGenerator, Dict, List, Optional, Tuple
 
-import cachetools.func
 import regex as re
-import requests
 import structlog
 
 from codegate.api import v1_models
@@ -34,16 +32,6 @@
 ]
 
 
-@cachetools.func.ttl_cache(maxsize=128, ttl=20 * 60)
-def fetch_latest_version() -> str:
-    url = "https://api.github.com/repos/stacklok/codegate/releases/latest"
-    headers = {"Accept": "application/vnd.github+json", "X-GitHub-Api-Version": "2022-11-28"}
-    response = requests.get(url, headers=headers, timeout=5)
-    response.raise_for_status()
-    data = response.json()
-    return data.get("tag_name", "unknown")
-
-
 async def generate_sse_events() -> AsyncGenerator[str, None]:
     """
     SSE generator from queue

src/codegate/cli.py

@@ -11,6 +11,7 @@
 from uvicorn.config import Config as UvicornConfig
 from uvicorn.server import Server
 
+import codegate
 from codegate.ca.codegate_ca import CertificateAuthority
 from codegate.codegate_logging import LogFormat, LogLevel, setup_logging
 from codegate.config import Config, ConfigurationError
@@ -25,6 +26,8 @@
 from codegate.providers.copilot.provider import CopilotProvider
 from codegate.server import init_app
 from codegate.storage.utils import restore_storage_backup
+from codegate.updates.client import init_update_client_singleton
+from codegate.updates.scheduled import ScheduledUpdateChecker
 from codegate.workspaces import crud as wscrud
 
 
@@ -322,9 +325,17 @@ def serve(  # noqa: C901
         logger = structlog.get_logger("codegate").bind(origin="cli")
 
         init_db_sync(cfg.db_path)
-        init_instance(cfg.db_path)
+        instance_id = init_instance(cfg.db_path)
         init_session_if_not_exists(cfg.db_path)
 
+        # Initialize the update checking logic.
+        update_client = init_update_client_singleton(
+            cfg.update_service_url, codegate.__version__, instance_id
+        )
+        update_checker = ScheduledUpdateChecker(update_client)
+        update_checker.daemon = True
+        update_checker.start()
+
         # Check certificates and create CA if necessary
         logger.info("Checking certificates and creating CA if needed")
         ca = CertificateAuthority.get_instance()

src/codegate/config.py

@@ -220,10 +220,6 @@ def from_env(cls) -> "Config":
                 config.db_path = os.environ["CODEGATE_DB_PATH"]
             if "CODEGATE_VEC_DB_PATH" in os.environ:
                 config.vec_db_path = os.environ["CODEGATE_VEC_DB_PATH"]
-            if "CODEGATE_USE_UPDATE_SERVICE" in os.environ:
-                config.use_update_service = cls.__bool_from_string(
-                    os.environ["CODEGATE_USE_UPDATE_SERVICE"]
-                )
             if "CODEGATE_UPDATE_SERVICE_URL" in os.environ:
                 config.update_service_url = os.environ["CODEGATE_UPDATE_SERVICE_URL"]
 
@@ -258,7 +254,6 @@ def load(
         force_certs: Optional[bool] = None,
         db_path: Optional[str] = None,
         vec_db_path: Optional[str] = None,
-        use_update_service: Optional[bool] = None,
         update_service_url: Optional[str] = None,
     ) -> "Config":
         """Load configuration with priority resolution.
@@ -288,7 +283,6 @@ def load(
             force_certs: Optional flag to force certificate generation
             db_path: Optional path to the main SQLite database file
             vec_db_path: Optional path to the vector SQLite database file
-            use_update_service: Optional flag to enable the update service
             update_service_url: Optional URL for the update service
 
         Returns:
@@ -342,8 +336,6 @@ def load(
             config.db_path = env_config.db_path
         if "CODEGATE_VEC_DB_PATH" in os.environ:
             config.vec_db_path = env_config.vec_db_path
-        if "CODEGATE_USE_UPDATE_SERVICE" in os.environ:
-            config.use_update_service = env_config.use_update_service
         if "CODEGATE_UPDATE_SERVICE_URL" in os.environ:
             config.update_service_url = env_config.update_service_url
 
@@ -386,8 +378,6 @@ def load(
             config.vec_db_path = vec_db_path
         if force_certs is not None:
             config.force_certs = force_certs
-        if use_update_service is not None:
-            config.use_update_service = use_update_service
         if update_service_url is not None:
             config.update_service_url = update_service_url
 

src/codegate/db/connection.py

@@ -600,10 +600,11 @@ async def delete_persona(self, persona_id: str) -> None:
         conditions = {"id": persona_id}
         await self._execute_with_no_return(sql, conditions)
 
-    async def init_instance(self) -> None:
+    async def init_instance(self) -> str:
         """
         Initializes instance details in the database.
         """
+        instance_id = str(uuid.uuid4())
         sql = text(
             """
             INSERT INTO instance (id, created_at)
@@ -613,13 +614,14 @@ async def init_instance(self) -> None:
 
         try:
             instance = Instance(
-                id=str(uuid.uuid4()),
+                id=instance_id,
                 created_at=datetime.datetime.now(datetime.timezone.utc),
             )
             await self._execute_with_no_return(sql, instance.model_dump())
         except IntegrityError as e:
             logger.debug(f"Exception type: {type(e)}")
             raise AlreadyExistsError("Instance already initialized.")
+        return instance_id
 
 
 class DbReader(DbCodeGate):
@@ -1326,18 +1328,21 @@ def init_session_if_not_exists(db_path: Optional[str] = None):
         logger.info("Session in DB initialized successfully.")
 
 
-def init_instance(db_path: Optional[str] = None):
+def init_instance(db_path: Optional[str] = None) -> str:
     db_reader = DbReader(db_path)
     instance = asyncio.run(db_reader.get_instance())
     # Initialize instance if not already initialized.
     if not instance:
         db_recorder = DbRecorder(db_path)
         try:
-            asyncio.run(db_recorder.init_instance())
+            instance_id = asyncio.run(db_recorder.init_instance())
+            logger.info("Instance initialized successfully.")
+            return instance_id
         except Exception as e:
             logger.error(f"Failed to initialize instance in DB: {e}")
             raise
-        logger.info("Instance initialized successfully.")
+    else:
+        return instance[0].id
 
 
 if __name__ == "__main__":

src/codegate/updates/client.py

@@ -1,39 +1,32 @@
 from enum import Enum
 
-import cachetools.func
 import requests
 import structlog
 
-from codegate.db.connection import DbReader
-
 logger = structlog.get_logger("codegate")
 
 
+__update_client_singleton = None
+
+
 # Enum representing whether the request is coming from the front-end or the back-end.
 class Origin(Enum):
     FrontEnd = "FE"
     BackEnd = "BE"
 
 
 class UpdateClient:
-    def __init__(self, update_url: str, current_version: str, db_reader: DbReader):
+    def __init__(self, update_url: str, current_version: str, instance_id: str):
         self.__update_url = update_url
         self.__current_version = current_version
-        self.__db_reader = db_reader
-        self.__instance_id = None
+        self.__instance_id = instance_id
 
-    async def get_latest_version(self, origin: Origin) -> str:
+    def get_latest_version(self, origin: Origin) -> str:
         """
         Retrieves the latest version of CodeGate from updates.codegate.ai
         """
-        logger.info(f"Fetching latest version from {self.__update_url}")
-        instance_id = await self.__get_instance_id()
-        return self.__fetch_latest_version(instance_id, origin)
-
-    @cachetools.func.ttl_cache(maxsize=128, ttl=20 * 60)
-    def __fetch_latest_version(self, instance_id: str, origin: Origin) -> str:
         headers = {
-            "X-Instance-ID": instance_id,
+            "X-Instance-ID": self.__instance_id,
             "User-Agent": f"codegate/{self.__current_version} {origin.value}",
         }
 
@@ -46,9 +39,19 @@ def __fetch_latest_version(self, instance_id: str, origin: Origin) -> str:
             logger.error(f"Error fetching latest version from f{self.__update_url}: {e}")
             return "unknown"
 
-    # Lazy load the instance ID from the DB.
-    async def __get_instance_id(self):
-        if self.__instance_id is None:
-            instance_data = await self.__db_reader.get_instance()
-            self.__instance_id = instance_data[0].id
-        return self.__instance_id
+
+# Use a singleton since we do not have a good way of doing dependency injection
+# with the API endpoints.
+def init_update_client_singleton(
+    update_url: str, current_version: str, instance_id: str
+) -> UpdateClient:
+    global __update_client_singleton
+    __update_client_singleton = UpdateClient(update_url, current_version, instance_id)
+    return __update_client_singleton
+
+
+def get_update_client_singleton() -> UpdateClient:
+    global __update_client_singleton
+    if __update_client_singleton is None:
+        raise ValueError("UpdateClient singleton not initialized")
+    return __update_client_singleton

src/codegate/updates/scheduled.py

@@ -0,0 +1,34 @@
+import threading
+import time
+
+import structlog
+
+import codegate
+from codegate.updates.client import Origin, UpdateClient
+
+logger = structlog.get_logger("codegate")
+
+
+class ScheduledUpdateChecker(threading.Thread):
+    """
+    ScheduledUpdateChecker calls the UpdateClient on a recurring interval.
+    This is implemented as a separate thread to avoid blocking the main thread.
+    A dedicated scheduling library could have been used, but the requirements
+    are trivial, and a simple hand-rolled solution is sufficient.
+    """
+
+    def __init__(self, client: UpdateClient, interval_seconds: int = 14400):  # 4 hours in seconds
+        super().__init__()
+        self.__client = client
+        self.__interval_seconds = interval_seconds
+
+    def run(self):
+        """
+        Overrides the `run` method of threading.Thread.
+        """
+        while True:
+            logger.info("Checking for CodeGate updates")
+            latest = self.__client.get_latest_version(Origin.BackEnd)
+            if latest != codegate.__version__:
+                logger.warning(f"A new version of CodeGate is available: {latest}")
+            time.sleep(self.__interval_seconds)