pub(super) fn new(
        broadcast_channel_size: usize,
        max_concurrent_subscribers: u32,
        deploy_getter: DeployGetter,
    ) -> Self {
        // Create a channel to broadcast new events to all subscribed clients' streams.
        let (event_broadcaster, _) = broadcast::channel(broadcast_channel_size);
        let cloned_broadcaster = event_broadcaster.clone();

        // Create a channel for `NewSubscriberInfo`s to pass the information required to handle a
        // new client subscription.
        let (new_subscriber_info_sender, new_subscriber_info_receiver) = mpsc::unbounded_channel();

        let sse_filter = warp::get()
            .and(path(SSE_API_ROOT_PATH))
            .and(path::param::<String>())
            .and(path::end())
            .and(warp::query())
            .map(move |path_param: String, query: HashMap<String, String>| {
                // If we already have the maximum number of subscribers, reject this new one.
                if cloned_broadcaster.receiver_count() >= max_concurrent_subscribers as usize {
                    info!(
                        %max_concurrent_subscribers,
                        "event stream server has max subscribers: rejecting new one"
                    );
                    return create_503();
                }

                // If `path_param` is not a valid string, return a 404.
                let event_filter = match get_filter(path_param.as_str()) {
                    Some(filter) => filter,
                    None => return create_404(),
                };

                let start_from = match parse_query(query) {
                    Ok(maybe_id) => maybe_id,
                    Err(error_response) => return error_response,
                };

                // Create a channel for the client's handler to receive the stream of initial
                // events.
                let (initial_events_sender, initial_events_receiver) = mpsc::unbounded_channel();

                // Supply the server with the sender part of the channel along with the client's
                // requested starting point.
                let new_subscriber_info = NewSubscriberInfo {
                    start_from,
                    initial_events_sender,
                };
                if new_subscriber_info_sender
                    .send(new_subscriber_info)
                    .is_err()
                {
                    error!("failed to send new subscriber info");
                }

                // Create a channel for the client's handler to receive the stream of ongoing
                // events.
                let ongoing_events_receiver = cloned_broadcaster.subscribe();

                sse::reply(sse::keep_alive().stream(stream_to_client(
                    initial_events_receiver,
                    ongoing_events_receiver,
                    event_filter,
                    deploy_getter.clone(),
                )))
                .into_response()
            })
            .or_else(|_| async move { Ok::<_, Rejection>((create_404(),)) })
            .boxed();

        ChannelsAndFilter {
            event_broadcaster,
            new_subscriber_info_receiver,
            sse_filter,
        }
    }
/// Creates the message-passing channels required to run the event-stream server and the warp
/// filter for the event-stream server.
Creates the message-passing channels required to run the event-stream server and the warp
filter for the event-stream server.
Creates the message - passing channels required to run the event - stream server and the warp filter for the event - stream server .
pub(super) fn new(
        broadcast_channel_size: usize,
        max_concurrent_subscribers: u32,
        deploy_getter: DeployGetter,
    ) -> Self {
        // Create a channel to broadcast new events to all subscribed clients' streams.
        let (event_broadcaster, _) = broadcast::channel(broadcast_channel_size);
        let cloned_broadcaster = event_broadcaster.clone();
        // Create a channel for `NewSubscriberInfo`s to pass the information required to handle a
        // new client subscription.
        let (new_subscriber_info_sender, new_subscriber_info_receiver) = mpsc::unbounded_channel();
        let sse_filter = warp::get()
            .and(path(SSE_API_ROOT_PATH))
            .and(path::param::<String>())
            .and(path::end())
            .and(warp::query())
            .map(move |path_param: String, query: HashMap<String, String>| {
                // If we already have the maximum number of subscribers, reject this new one.
                if cloned_broadcaster.receiver_count() >= max_concurrent_subscribers as usize {
                    info!(
                        %max_concurrent_subscribers,
                        "event stream server has max subscribers: rejecting new one"
                    );
                    return create_503();
                }
                // If `path_param` is not a valid string, return a 404.
                let event_filter = match get_filter(path_param.as_str()) {
                    Some(filter) => filter,
                    None => return create_404(),
                };
                let start_from = match parse_query(query) {
                    Ok(maybe_id) => maybe_id,
                    Err(error_response) => return error_response,
                };
                // Create a channel for the client's handler to receive the stream of initial
                // events.
                let (initial_events_sender, initial_events_receiver) = mpsc::unbounded_channel();
                // Supply the server with the sender part of the channel along with the client's
                // requested starting point.
                let new_subscriber_info = NewSubscriberInfo {
                    start_from,
                    initial_events_sender,
                };
                if new_subscriber_info_sender
                    .send(new_subscriber_info)
                    .is_err()
                {
                    error!("failed to send new subscriber info");
                }
                // Create a channel for the client's handler to receive the stream of ongoing
                // events.
                let ongoing_events_receiver = cloned_broadcaster.subscribe();
                sse::reply(sse::keep_alive().stream(stream_to_client(
                    initial_events_receiver,
                    ongoing_events_receiver,
                    event_filter,
                    deploy_getter.clone(),
                )))
                .into_response()
            })
            .or_else(|_| async move { Ok::<_, Rejection>((create_404(),)) })
            .boxed();
        ChannelsAndFilter {
            event_broadcaster,
            new_subscriber_info_receiver,
            sse_filter,
        }
    }
pub ( super ) fn new ( broadcast_channel_size : usize , max_concurrent_subscribers : u32 , deploy_getter : DeployGetter , ) -> Self { // Create a channel to broadcast new events to all subscribed clients' streams. let ( event_broadcaster , _ ) = broadcast :: channel ( broadcast_channel_size ) ; let cloned_broadcaster = event_broadcaster . clone ( ) ; // Create a channel for `NewSubscriberInfo`s to pass the information required to handle a // new client subscription. let ( new_subscriber_info_sender , new_subscriber_info_receiver ) = mpsc :: unbounded_channel ( ) ; let sse_filter = warp :: get ( ) . and ( path ( SSE_API_ROOT_PATH ) ) . and ( path :: param :: < String > ( ) ) . and ( path :: end ( ) ) . and ( warp :: query ( ) ) . map ( move | path_param : String , query : HashMap < String , String > | { // If we already have the maximum number of subscribers, reject this new one. if cloned_broadcaster . receiver_count ( ) >= max_concurrent_subscribers as usize { info ! ( max_concurrent_subscribers " " ) ; return create_503 ( ) ; } // If `path_param` is not a valid string, return a 404. let event_filter = match get_filter ( path_param . as_str ( ) ) { Some ( filter ) => filter , None => return create_404 ( ) , } ; let start_from = match parse_query ( query ) { Ok ( maybe_id ) => maybe_id , Err ( error_response ) => return error_response , } ; // Create a channel for the client's handler to receive the stream of initial // events. let ( initial_events_sender , initial_events_receiver ) = mpsc :: unbounded_channel ( ) ; // Supply the server with the sender part of the channel along with the client's // requested starting point. let new_subscriber_info = NewSubscriberInfo { start_from , initial_events_sender , } ; if new_subscriber_info_sender . send ( new_subscriber_info ) . is_err ( ) { error ! ( " " ) ; } // Create a channel for the client's handler to receive the stream of ongoing // events. let ongoing_events_receiver = cloned_broadcaster . subscribe ( ) ; sse :: reply ( sse :: keep_alive ( ) . stream ( stream_to_client ( initial_events_receiver , ongoing_events_receiver , event_filter , deploy_getter . clone ( ) , ) ) ) . into_response ( ) } ) . or_else ( | _ | async move { Ok :: < _ , Rejection > ( ( create_404 ( ) , ) ) } ) . boxed ( ) ; ChannelsAndFilter { event_broadcaster , new_subscriber_info_receiver , sse_filter , } }
Creates the message-passing channels required to run the event-stream server and the warp
filter for the event-stream server.
Creates the message - passing channels required to run the event - stream server and the warp filter for the event - stream server .
broadcast_channel_size
usize
max_concurrent_subscribers
u32
deploy_getter
DeployGetter
broadcast_channel_size
usize
max_concurrent_subscribers
u32
deploy_getter
DeployGetter