remove synchronous federation

remove activity sender queue

api_tests/run-federation-test.sh

@@ -2,7 +2,6 @@
 set -e
 
 export LEMMY_DATABASE_URL=postgres://lemmy:password@localhost:5432
-export LEMMY_SYNCHRONOUS_FEDERATION=1 # currently this is true in debug by default, but still.
 pushd ..
 cargo build
 rm target/lemmy_server || true

crates/api_common/src/send_activity.rs

@@ -17,22 +17,14 @@ use lemmy_db_schema::{
   },
 };
 use lemmy_db_views::structs::PrivateMessageView;
-use lemmy_utils::{error::LemmyResult, SYNCHRONOUS_FEDERATION};
-use once_cell::sync::{Lazy, OnceCell};
-use tokio::{
-  sync::{
-    mpsc,
-    mpsc::{UnboundedReceiver, UnboundedSender, WeakUnboundedSender},
-    Mutex,
-  },
-  task::JoinHandle,
-};
+use lemmy_utils::error::LemmyResult;
+use once_cell::sync::OnceCell;
 use url::Url;
 
 type MatchOutgoingActivitiesBoxed =
   Box<for<'a> fn(SendActivityData, &'a Data<LemmyContext>) -> BoxFuture<'a, LemmyResult<()>>>;
 
-/// This static is necessary so that activities can be sent out synchronously for tests.
+/// This static is necessary so that the api_common crates don't need to depend on lemmy_apub
 pub static MATCH_OUTGOING_ACTIVITIES: OnceCell<MatchOutgoingActivitiesBoxed> = OnceCell::new();
 
 #[derive(Debug)]
@@ -62,51 +54,16 @@ pub enum SendActivityData {
   CreateReport(Url, Person, Community, String),
 }
 
-// TODO: instead of static, move this into LemmyContext. make sure that stopping the process with
-//       ctrl+c still works.
-static ACTIVITY_CHANNEL: Lazy<ActivityChannel> = Lazy::new(|| {
-  let (sender, receiver) = mpsc::unbounded_channel();
-  let weak_sender = sender.downgrade();
-  ActivityChannel {
-    weak_sender,
-    receiver: Mutex::new(receiver),
-    keepalive_sender: Mutex::new(Some(sender)),
-  }
-});
-
-pub struct ActivityChannel {
-  weak_sender: WeakUnboundedSender<SendActivityData>,
-  receiver: Mutex<UnboundedReceiver<SendActivityData>>,
-  keepalive_sender: Mutex<Option<UnboundedSender<SendActivityData>>>,
-}
+pub struct ActivityChannel;
 
 impl ActivityChannel {
-  pub async fn retrieve_activity() -> Option<SendActivityData> {
-    let mut lock = ACTIVITY_CHANNEL.receiver.lock().await;
-    lock.recv().await
-  }
-
   pub async fn submit_activity(
     data: SendActivityData,
     context: &Data<LemmyContext>,
   ) -> LemmyResult<()> {
-    if *SYNCHRONOUS_FEDERATION {
-      MATCH_OUTGOING_ACTIVITIES
-        .get()
-        .expect("retrieve function pointer")(data, context)
-      .await?;
-    }
-    // could do `ACTIVITY_CHANNEL.keepalive_sender.lock()` instead and get rid of weak_sender,
-    // not sure which way is more efficient
-    else if let Some(sender) = ACTIVITY_CHANNEL.weak_sender.upgrade() {
-      sender.send(data)?;
-    }
-    Ok(())
-  }
-
-  pub async fn close(outgoing_activities_task: JoinHandle<LemmyResult<()>>) -> LemmyResult<()> {
-    ACTIVITY_CHANNEL.keepalive_sender.lock().await.take();
-    outgoing_activities_task.await??;
-    Ok(())
+    MATCH_OUTGOING_ACTIVITIES
+      .get()
+      .expect("retrieve function pointer")(data, context)
+    .await
   }
 }

crates/api_crud/src/post/create.rs

@@ -37,7 +37,6 @@ use lemmy_utils::{
     slurs::{check_slurs, check_slurs_opt},
     validation::{check_url_scheme, clean_url_params, is_valid_body_field, is_valid_post_title},
   },
-  SYNCHRONOUS_FEDERATION,
 };
 use tracing::Instrument;
 use url::Url;
@@ -190,11 +189,7 @@ pub async fn create_post(
         Err(e) => Err(e).with_lemmy_type(LemmyErrorType::CouldntSendWebmention),
       }
     };
-    if *SYNCHRONOUS_FEDERATION {
-      task.await?;
-    } else {
-      spawn_try_task(task);
-    }
+    spawn_try_task(task);
   };
 
   build_post_response(&context, community_id, person_id, post_id).await

crates/apub/src/activities/mod.rs

@@ -48,7 +48,6 @@ use lemmy_db_views_actor::structs::{CommunityPersonBanView, CommunityView};
 use lemmy_utils::{
   error::{LemmyError, LemmyErrorExt, LemmyErrorType, LemmyResult},
   spawn_try_task,
-  SYNCHRONOUS_FEDERATION,
 };
 use serde::Serialize;
 use std::{ops::Deref, time::Duration};
@@ -225,13 +224,6 @@ where
   Ok(())
 }
 
-pub async fn handle_outgoing_activities(context: Data<LemmyContext>) -> LemmyResult<()> {
-  while let Some(data) = ActivityChannel::retrieve_activity().await {
-    match_outgoing_activities(data, &context.reset_request_count()).await?
-  }
-  Ok(())
-}
-
 pub async fn match_outgoing_activities(
   data: SendActivityData,
   context: &Data<LemmyContext>,
@@ -336,10 +328,6 @@ pub async fn match_outgoing_activities(
       }
     }
   };
-  if *SYNCHRONOUS_FEDERATION {
-    fed_task.await?;
-  } else {
-    spawn_try_task(fed_task);
-  }
+  spawn_try_task(fed_task);
   Ok(())
 }

crates/utils/src/lib.rs

@@ -18,7 +18,6 @@ pub mod version;
 
 use error::LemmyError;
 use futures::Future;
-use once_cell::sync::Lazy;
 use std::time::Duration;
 use tracing::Instrument;
 
@@ -38,16 +37,6 @@ macro_rules! location_info {
   };
 }
 
-/// if true, all federation should happen synchronously. useful for debugging and testing.
-/// defaults to true on debug mode, false on releasemode
-/// override to true by setting env LEMMY_SYNCHRONOUS_FEDERATION=1
-/// override to false by setting env LEMMY_SYNCHRONOUS_FEDERATION=""
-pub static SYNCHRONOUS_FEDERATION: Lazy<bool> = Lazy::new(|| {
-  std::env::var("LEMMY_SYNCHRONOUS_FEDERATION")
-    .map(|s| !s.is_empty())
-    .unwrap_or(cfg!(debug_assertions))
-});
-
 /// tokio::spawn, but accepts a future that may fail and also
 /// * logs errors
 /// * attaches the spawned task to the tracing span of the caller for better logging

src/api_routes_http.rs

@@ -107,7 +107,7 @@ use lemmy_apub::{
   },
   SendActivity,
 };
-use lemmy_utils::{rate_limit::RateLimitCell, spawn_try_task, SYNCHRONOUS_FEDERATION};
+use lemmy_utils::{rate_limit::RateLimitCell, spawn_try_task};
 use serde::Deserialize;
 
 pub fn config(cfg: &mut web::ServiceConfig, rate_limit: &RateLimitCell) {
@@ -364,11 +364,7 @@ where
   let res = data.perform(&context).await?;
   let res_clone = res.clone();
   let fed_task = async move { SendActivity::send_activity(&data, &res_clone, &apub_data).await };
-  if *SYNCHRONOUS_FEDERATION {
-    fed_task.await?;
-  } else {
-    spawn_try_task(fed_task);
-  }
+  spawn_try_task(fed_task);
   Ok(HttpResponse::Ok().json(&res))
 }
 

src/lib.rs

@@ -27,14 +27,14 @@ use lemmy_api_common::{
   context::LemmyContext,
   lemmy_db_views::structs::SiteView,
   request::build_user_agent,
-  send_activity::{ActivityChannel, MATCH_OUTGOING_ACTIVITIES},
+  send_activity::MATCH_OUTGOING_ACTIVITIES,
   utils::{
     check_private_instance_and_federation_enabled,
     local_site_rate_limit_to_rate_limit_config,
   },
 };
 use lemmy_apub::{
-  activities::{handle_outgoing_activities, match_outgoing_activities},
+  activities::match_outgoing_activities,
   VerifyUrlData,
   FEDERATION_HTTP_FETCH_LIMIT,
 };
@@ -49,7 +49,6 @@ use lemmy_utils::{
   rate_limit::RateLimitCell,
   response::jsonify_plain_text_errors,
   settings::SETTINGS,
-  SYNCHRONOUS_FEDERATION,
 };
 use reqwest::Client;
 use reqwest_middleware::ClientBuilder;
@@ -179,7 +178,7 @@ pub async fn start_lemmy_server() -> Result<(), LemmyError> {
     .app_data(context.clone())
     .client(client.clone())
     .http_fetch_limit(FEDERATION_HTTP_FETCH_LIMIT)
-    .debug(*SYNCHRONOUS_FEDERATION)
+    .debug(false)
     .http_signature_compat(true)
     .url_verifier(Box::new(VerifyUrlData(context.inner_pool().clone())))
     .build()
@@ -198,8 +197,6 @@ pub async fn start_lemmy_server() -> Result<(), LemmyError> {
       Box::pin(match_outgoing_activities(d, c))
     }))
     .expect("set function pointer");
-  let request_data = federation_config.to_request_data();
-  let outgoing_activities_task = tokio::task::spawn(handle_outgoing_activities(request_data));
 
   let server = if args.http_server {
     let federation_config = federation_config.clone();
@@ -290,9 +287,6 @@ pub async fn start_lemmy_server() -> Result<(), LemmyError> {
     federate.cancel().await?;
   }
 
-  // Wait for outgoing apub sends to complete
-  ActivityChannel::close(outgoing_activities_task).await?;
-
   Ok(())
 }