solti-api 0.0.1

//! # gRPC transport.
//!
//! [`SoltiApiService`] implements the generated `SoltiApi` trait from `proto/solti/v1/api.proto`,
//! delegating to an [`ApiHandler`](crate::ApiHandler).

use std::sync::Arc;

use tonic::{Request, Response, Status};
use tracing::debug;

use solti_model::TaskQuery;

use crate::convert::{proto_to_domain_status, tasks_page_to_proto};
use crate::error::ApiError;
use crate::handler::ApiHandler;
use crate::proto_api::{self, solti_api_server::SoltiApi, solti_api_server::SoltiApiServer};
use crate::validate::{clamp_list_limit, non_empty_id};

/// gRPC service wrapping an [`ApiHandler`](crate::ApiHandler).
///
/// ## Also
///
/// - `SoltiApiServer` generated tonic server wrapper.
/// - [`ApiError`](crate::ApiError) mapped to `tonic::Status`.
pub struct SoltiApiService<H> {
    handler: Arc<H>,
}

impl<H> SoltiApiService<H>
where
    H: ApiHandler,
{
    /// Create a new gRPC service with the given handler.
    pub fn new(handler: Arc<H>) -> Self {
        Self { handler }
    }
}

/// Build a configured `SoltiApiServer` ready to mount on a tonic server.
///
/// ## Example
///
/// ```rust,no_run
/// # use std::sync::Arc;
/// # use solti_api::{build_grpc_server, SupervisorApiAdapter};
/// # async fn example(adapter: Arc<SupervisorApiAdapter>) -> Result<(), Box<dyn std::error::Error>> {
/// let svc = build_grpc_server(adapter);
/// tonic::transport::Server::builder()
///     .add_service(svc)
///     .serve("0.0.0.0:50052".parse()?)
///     .await?;
/// # Ok(()) }
/// ```
pub fn build_grpc_server<H>(handler: Arc<H>) -> SoltiApiServer<SoltiApiService<H>>
where
    H: ApiHandler,
{
    SoltiApiServer::new(SoltiApiService::new(handler))
        .max_decoding_message_size(crate::MAX_REQUEST_BYTES)
        .max_encoding_message_size(crate::MAX_REQUEST_BYTES)
}

#[tonic::async_trait]
impl<H> SoltiApi for SoltiApiService<H>
where
    H: ApiHandler,
{
    async fn submit_task(
        &self,
        request: Request<proto_api::SubmitTaskRequest>,
    ) -> Result<Response<proto_api::SubmitTaskResponse>, Status> {
        let req = request.into_inner();

        let spec = req
            .spec
            .ok_or_else(|| Status::invalid_argument("missing spec"))?;

        let spec =
            crate::convert::convert_create_spec(spec).map_err(|e: ApiError| Status::from(e))?;

        debug!(slot = %spec.slot(), kind = ?spec.kind(), "grpc: submitting task");
        let task_id = self.handler.submit_task(spec).await.map_err(Status::from)?;

        Ok(Response::new(proto_api::SubmitTaskResponse {
            task_id: task_id.to_string(),
        }))
    }

    async fn get_task_status(
        &self,
        request: Request<proto_api::GetTaskStatusRequest>,
    ) -> Result<Response<proto_api::GetTaskStatusResponse>, Status> {
        let req = request.into_inner();

        non_empty_id("task_id", &req.task_id).map_err(Status::from)?;

        let task_id = solti_model::TaskId::from(req.task_id);
        debug!(%task_id, "grpc: getting task status");

        let info = self
            .handler
            .get_task_status(&task_id)
            .await
            .map_err(Status::from)?;

        let task = info
            .map(proto_api::TaskData::try_from)
            .transpose()
            .map_err(Status::from)?;

        Ok(Response::new(proto_api::GetTaskStatusResponse { task }))
    }

    async fn list_tasks(
        &self,
        request: Request<proto_api::ListTasksRequest>,
    ) -> Result<Response<proto_api::ListTasksResponse>, Status> {
        let req = request.into_inner();

        let mut query = TaskQuery::new();

        if let Some(slot) = req.slot {
            non_empty_id("slot", &slot).map_err(Status::from)?;
            query = query.with_slot(slot);
        }

        if let Some(status_raw) = req.status {
            let status = proto_to_domain_status(status_raw).map_err(Status::from)?;
            query = query.with_status(status);
        }

        query = query.with_limit(clamp_list_limit(req.limit));
        if req.offset > 0 {
            query = query.with_offset(req.offset as usize);
        }

        let page = self
            .handler
            .query_tasks(query)
            .await
            .map_err(Status::from)?;

        debug!(
            count = page.items.len(),
            total = page.total,
            "grpc: tasks listed"
        );

        let response = tasks_page_to_proto(page).map_err(Status::from)?;
        Ok(Response::new(response))
    }

    async fn list_task_runs(
        &self,
        request: Request<proto_api::ListTaskRunsRequest>,
    ) -> Result<Response<proto_api::ListTaskRunsResponse>, Status> {
        let req = request.into_inner();

        non_empty_id("task_id", &req.task_id).map_err(Status::from)?;

        let task_id = solti_model::TaskId::from(req.task_id);
        debug!(%task_id, "grpc: listing task runs");

        let runs = self
            .handler
            .list_task_runs(&task_id)
            .await
            .map_err(Status::from)?;

        let runs = runs.into_iter().map(proto_api::TaskRunInfo::from).collect();

        Ok(Response::new(proto_api::ListTaskRunsResponse { runs }))
    }

    async fn delete_task(
        &self,
        request: Request<proto_api::DeleteTaskRequest>,
    ) -> Result<Response<proto_api::DeleteTaskResponse>, Status> {
        let req = request.into_inner();

        non_empty_id("task_id", &req.task_id).map_err(Status::from)?;

        let task_id = solti_model::TaskId::from(req.task_id);
        debug!(%task_id, "grpc: deleting task");

        self.handler
            .delete_task(&task_id)
            .await
            .map_err(Status::from)?;

        debug!(%task_id, "grpc: task deleted");
        Ok(Response::new(proto_api::DeleteTaskResponse {}))
    }
}