feat: make Run task metadata settable (#158)

src/isolate/backends/common.py

@@ -117,6 +117,7 @@ def forward_lines(fd: int) -> None:
                 return  # Nothing to read
 
             for line in raw_data.splitlines():
+                # TODO: parse the lines to include `extra={...}` added by the logger?
                 hook(line)
 
     def _reader():

src/isolate/server/server.py

@@ -377,13 +377,19 @@ def Run(
         context: ServicerContext,
     ) -> Iterator[definitions.PartialRunResult]:
         try:
-            yield from self._run_task(RunTask(request=request))
+            # HACK: we can support only one task at a time for Run
+            # TODO: move away from this when we use submit for env-aware tasks
+            task = RunTask(request=request)
+            self.background_tasks["RUN"] = task
+            yield from self._run_task(task)
         except GRPCException as exc:
             return self.abort_with_msg(
                 exc.message,
                 context,
                 code=exc.code,
             )
+        finally:
+            self.background_tasks.pop("RUN", None)
 
     def List(
         self,