Line data    Source code

       1              : use crate::compute::{ComputeNode, forward_termination_signal};
       2              : use crate::http::JsonResponse;
       3              : use axum::extract::State;
       4              : use axum::response::Response;
       5              : use axum_extra::extract::OptionalQuery;
       6              : use compute_api::responses::{ComputeStatus, TerminateMode, TerminateResponse};
       7              : use http::StatusCode;
       8              : use serde::Deserialize;
       9              : use std::sync::Arc;
      10              : use tokio::task;
      11              : use tracing::info;
      12              : 
      13            0 : #[derive(Deserialize, Default)]
      14              : pub struct TerminateQuery {
      15              :     mode: TerminateMode,
      16              : }
      17              : 
      18              : /// Terminate the compute.
      19            0 : pub(in crate::http) async fn terminate(
      20            0 :     State(compute): State<Arc<ComputeNode>>,
      21            0 :     OptionalQuery(terminate): OptionalQuery<TerminateQuery>,
      22            0 : ) -> Response {
      23            0 :     let mode = terminate.unwrap_or_default().mode;
      24              :     {
      25            0 :         let mut state = compute.state.lock().unwrap();
      26            0 :         if state.status == ComputeStatus::Terminated {
      27            0 :             let response = TerminateResponse {
      28            0 :                 lsn: state.terminate_flush_lsn,
      29            0 :             };
      30            0 :             return JsonResponse::success(StatusCode::CREATED, response);
      31            0 :         }
      32              : 
      33            0 :         if !matches!(state.status, ComputeStatus::Empty | ComputeStatus::Running) {
      34            0 :             return JsonResponse::invalid_status(state.status);
      35            0 :         }
      36            0 :         state.set_status(mode.into(), &compute.state_changed);
      37              :     }
      38              : 
      39            0 :     forward_termination_signal(false);
      40            0 :     info!("sent signal and notified waiters");
      41              : 
      42              :     // Spawn a blocking thread to wait for compute to become Terminated.
      43              :     // This is needed to do not block the main pool of workers and
      44              :     // be able to serve other requests while some particular request
      45              :     // is waiting for compute to finish configuration.
      46            0 :     let c = compute.clone();
      47            0 :     let lsn = task::spawn_blocking(move || {
      48            0 :         let mut state = c.state.lock().unwrap();
      49            0 :         while state.status != ComputeStatus::Terminated {
      50            0 :             state = c.state_changed.wait(state).unwrap();
      51            0 :             info!(
      52            0 :                 "waiting for compute to become {}, current status: {:?}",
      53              :                 ComputeStatus::Terminated,
      54            0 :                 state.status
      55              :             );
      56              :         }
      57            0 :         state.terminate_flush_lsn
      58            0 :     })
      59            0 :     .await
      60            0 :     .unwrap();
      61            0 :     info!("terminated Postgres");
      62            0 :     JsonResponse::success(StatusCode::OK, TerminateResponse { lsn })
      63            0 : }