Commits on Nov 25, 2024

1. [TaskCenter][2/n] Introduces TaskCenterFuture extensions traits …

   - Adds `in_tc(&TaskCenter)` and `in_current_tc()` to scope a future to run in a task-center if it'll be dispatched as a task
   - Introduces a root task (TaskId(0)) in TaskCenter that's used as a default parent/source of task context
   - Removes unnecessary args from block_on, run_in_scope_sync. (some of those will be changed in future PRs)
   - Introduces `Metadata::current()` and `Metadata::with_current(F)`

   

   AhmedSoliman committed Nov 25, 2024
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2. [TaskCenter][3/n] New TaskCenter::spawn_child …

   - Improvements to the future extensions (fixing root task context propagation)
   - A round of removals of explicit task-center reference passing
   - `try_set_global_metadata` is now an associated function
   
   ## Example
   
   Before:
   ```rust
     task_center().spawn_child(
         TaskKind::RpcServer,
         "metadata-store-grpc",
         None,
         async move {
             net_util::run_hyper_server(
                 &bind_address,
                 service,
                 "metadata-store-grpc",
                 || health_status.update(MetadataServerStatus::Ready),
                 || health_status.update(MetadataServerStatus::Unknown),
             )
             .await?;
             Ok(())
         },
     )?;
   ```
   
   After:
   ```rust
     TaskCenter::spawn_child(TaskKind::RpcServer, "metadata-store-grpc", async move {
         net_util::run_hyper_server(
             &bind_address,
             service,
             "metadata-store-grpc",
             || health_status.update(MetadataServerStatus::Ready),
             || health_status.update(MetadataServerStatus::Unknown),
         )
         .await?;
         Ok(())
     })?;
   ```

   

   AhmedSoliman committed Nov 25, 2024
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