always set SignalR events at the end of handlers (#445)

Addresses an issue where events meant for SignalR do not get sent to the service when an App Service instance spins down before a timer event fires.

src/api-service/__app__/node/__init__.py

@@ -10,6 +10,7 @@ from onefuzztypes.requests import NodeGet, NodeSearch, NodeUpdate
 from onefuzztypes.responses import BoolResult
 
 from ..onefuzzlib.endpoint_authorization import call_if_user
+from ..onefuzzlib.events import get_events
 from ..onefuzzlib.pools import Node, NodeTasks
 from ..onefuzzlib.request import not_ok, ok, parse_request
 
@@ -100,7 +101,13 @@ def patch(req: func.HttpRequest) -> func.HttpResponse:
     return ok(BoolResult(result=True))
 
 
-def main(req: func.HttpRequest) -> func.HttpResponse:
+def main(req: func.HttpRequest, dashboard: func.Out[str]) -> func.HttpResponse:
     methods = {"GET": get, "PATCH": patch, "DELETE": delete, "POST": post}
     method = methods[req.method]
-    return call_if_user(req, method)
+    result = call_if_user(req, method)
+
+    events = get_events()
+    if events:
+        dashboard.set(events)
+
+    return result

src/api-service/__app__/node/function.json

@@ -1,22 +1,28 @@
 {
-    "scriptFile": "__init__.py",
-    "bindings": [
-        {
-            "authLevel": "anonymous",
-            "type": "httpTrigger",
-            "direction": "in",
-            "name": "req",
-            "methods": [
-                "get",
-                "patch",
-                "delete",
-                "post"
-            ]
-        },
-        {
-            "type": "http",
-            "direction": "out",
-            "name": "$return"
-        }
-    ]
-}
+  "scriptFile": "__init__.py",
+  "bindings": [
+    {
+      "authLevel": "anonymous",
+      "type": "httpTrigger",
+      "direction": "in",
+      "name": "req",
+      "methods": [
+        "get",
+        "patch",
+        "delete",
+        "post"
+      ]
+    },
+    {
+      "type": "http",
+      "direction": "out",
+      "name": "$return"
+    },
+    {
+      "type": "signalR",
+      "direction": "out",
+      "name": "dashboard",
+      "hubName": "dashboard"
+    }
+  ]
+}