server/src/apub/activities.rs

@@ -1,20 +1,11 @@
 use crate::{
-  apub::{
-    check_is_apub_id_valid,
-    community::do_announce,
-    extensions::signatures::sign,
-    insert_activity,
-    ActorType,
-  },
-  request::retry_custom,
+  apub::{activity_sender::SendUserActivity, community::do_announce, insert_activity},
   LemmyContext,
   LemmyError,
 };
 use activitystreams::base::AnyBase;
-use actix_web::client::Client;
 use lemmy_db::{community::Community, user::User_};
 use lemmy_utils::{get_apub_protocol_string, settings::Settings};
-use log::debug;
 use url::{ParseError, Url};
 use uuid::Uuid;
 
@@ -31,42 +22,12 @@ pub async fn send_activity_to_community(
   if community.local {
     do_announce(activity, &community, creator, context).await?;
   } else {
-    send_activity(context.client(), &activity, creator, to).await?;
-  }
-
-  Ok(())
-}
-
-/// Send an activity to a list of recipients, using the correct headers etc.
-pub async fn send_activity(
-  client: &Client,
-  activity: &AnyBase,
-  actor: &dyn ActorType,
-  to: Vec<Url>,
-) -> Result<(), LemmyError> {
-  if !Settings::get().federation.enabled {
-    return Ok(());
-  }
-
-  let activity = serde_json::to_string(&activity)?;
-  debug!("Sending activitypub activity {} to {:?}", activity, to);
-
-  for to_url in to {
-    check_is_apub_id_valid(&to_url)?;
-
-    let res = retry_custom(|| async {
-      let request = client
-        .post(to_url.as_str())
-        .header("Content-Type", "application/json");
-
-      match sign(request, actor, activity.clone()).await {
-        Ok(signed) => Ok(signed.send().await),
-        Err(e) => Err(e),
-      }
-    })
-    .await?;
-
-    debug!("Result for activity send: {:?}", res);
+    let message = SendUserActivity {
+      activity,
+      actor: creator.to_owned(),
+      to,
+    };
+    context.activity_sender().send(message).await??;
   }
 
   Ok(())

server/src/apub/activity_sender.rs

@@ -0,0 +1,95 @@
+use crate::{
+  apub::{check_is_apub_id_valid, extensions::signatures::sign, ActorType},
+  LemmyError,
+};
+use activitystreams::base::AnyBase;
+use actix::prelude::*;
+use awc::Client;
+use lemmy_db::{community::Community, user::User_};
+use lemmy_utils::settings::Settings;
+use log::debug;
+use url::Url;
+
+// We cant use ActorType here, because it doesnt implement Sized
+#[derive(Message)]
+#[rtype(result = "Result<(), LemmyError>")]
+pub struct SendUserActivity {
+  pub activity: AnyBase,
+  pub actor: User_,
+  pub to: Vec<Url>,
+}
+
+#[derive(Message)]
+#[rtype(result = "Result<(), LemmyError>")]
+pub struct SendCommunityActivity {
+  pub activity: AnyBase,
+  pub actor: Community,
+  pub to: Vec<Url>,
+}
+
+pub struct ActivitySender {
+  client: Client,
+}
+
+impl ActivitySender {
+  pub fn startup(client: Client) -> ActivitySender {
+    ActivitySender { client }
+  }
+}
+
+impl Actor for ActivitySender {
+  type Context = Context<Self>;
+}
+
+impl Handler<SendUserActivity> for ActivitySender {
+  type Result = Result<(), LemmyError>;
+
+  fn handle(&mut self, msg: SendUserActivity, _ctx: &mut Context<Self>) -> Self::Result {
+    send_activity(msg.activity, &msg.actor, msg.to, &self.client)
+  }
+}
+
+impl Handler<SendCommunityActivity> for ActivitySender {
+  type Result = Result<(), LemmyError>;
+
+  fn handle(&mut self, msg: SendCommunityActivity, _ctx: &mut Context<Self>) -> Self::Result {
+    send_activity(msg.activity, &msg.actor, msg.to, &self.client)
+  }
+}
+
+fn send_activity(
+  activity: AnyBase,
+  actor: &dyn ActorType,
+  to: Vec<Url>,
+  client: &Client,
+) -> Result<(), LemmyError> {
+  if !Settings::get().federation.enabled {
+    return Ok(());
+  }
+
+  let serialised_activity = serde_json::to_string(&activity)?;
+  debug!(
+    "Sending activitypub activity {} to {:?}",
+    &serialised_activity, &to
+  );
+
+  for to_url in &to {
+    check_is_apub_id_valid(&to_url)?;
+
+    let request = client
+      .post(to_url.as_str())
+      .header("Content-Type", "application/json");
+
+    let serialised_activity = serialised_activity.clone();
+    Box::pin(async move {
+      // TODO: need to remove the unwrap, but ? causes compile errors
+      // TODO: if the sending fails, it should retry with exponential backoff
+      let signed = sign(request, actor, serialised_activity).await.unwrap();
+      let res = signed.send().await;
+      debug!("Result for activity send: {:?}", res);
+      Ok::<(), LemmyError>(())
+    });
+  }
+
+  Ok(())
+}

server/src/apub/community.rs

@@ -1,7 +1,8 @@
 use crate::{
   api::{check_slurs, check_slurs_opt},
   apub::{
-    activities::{generate_activity_id, send_activity},
+    activities::generate_activity_id,
+    activity_sender::{SendCommunityActivity, SendUserActivity},
     check_actor_domain,
     create_apub_response,
     create_apub_tombstone_response,
@@ -155,7 +156,12 @@ impl ActorType for Community {
 
     insert_activity(self.creator_id, accept.clone(), true, context.pool()).await?;
 
-    send_activity(context.client(), &accept.into_any_base()?, self, vec![to]).await?;
+    let message = SendCommunityActivity {
+      activity: accept.into_any_base()?,
+      actor: self.to_owned(),
+      to: vec![to],
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -176,7 +182,12 @@ impl ActorType for Community {
     // Note: For an accept, since it was automatic, no one pushed a button,
     // the community was the actor.
     // But for delete, the creator is the actor, and does the signing
-    send_activity(context.client(), &delete.into_any_base()?, creator, inboxes).await?;
+    let message = SendUserActivity {
+      activity: delete.into_any_base()?,
+      actor: creator.to_owned(),
+      to: inboxes,
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -208,7 +219,12 @@ impl ActorType for Community {
     // Note: For an accept, since it was automatic, no one pushed a button,
     // the community was the actor.
     // But for delete, the creator is the actor, and does the signing
-    send_activity(context.client(), &undo.into_any_base()?, creator, inboxes).await?;
+    let message = SendUserActivity {
+      activity: undo.into_any_base()?,
+      actor: creator.to_owned(),
+      to: inboxes,
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -229,7 +245,12 @@ impl ActorType for Community {
     // Note: For an accept, since it was automatic, no one pushed a button,
     // the community was the actor.
     // But for delete, the creator is the actor, and does the signing
-    send_activity(context.client(), &remove.into_any_base()?, mod_, inboxes).await?;
+    let message = SendUserActivity {
+      activity: remove.into_any_base()?,
+      actor: mod_.to_owned(),
+      to: inboxes,
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -258,7 +279,12 @@ impl ActorType for Community {
     // Note: For an accept, since it was automatic, no one pushed a button,
     // the community was the actor.
     // But for remove , the creator is the actor, and does the signing
-    send_activity(context.client(), &undo.into_any_base()?, mod_, inboxes).await?;
+    let message = SendUserActivity {
+      activity: undo.into_any_base()?,
+      actor: mod_.to_owned(),
+      to: inboxes,
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -511,7 +537,12 @@ pub async fn do_announce(
   let community_shared_inbox = community.get_shared_inbox_url()?;
   to.retain(|x| x != &community_shared_inbox);
 
-  send_activity(context.client(), &announce.into_any_base()?, community, to).await?;
+  let message = SendCommunityActivity {
+    activity: announce.into_any_base()?,
+    actor: community.to_owned(),
+    to,
+  };
+  context.activity_sender().send(message).await??;
 
   Ok(())
 }

server/src/apub/mod.rs

@@ -1,3 +1,4 @@
+pub mod activity_sender;
 pub mod activities;
 pub mod comment;
 pub mod community;

server/src/apub/private_message.rs

@@ -1,6 +1,7 @@
 use crate::{
   apub::{
-    activities::{generate_activity_id, send_activity},
+    activities::generate_activity_id,
+    activity_sender::SendUserActivity,
     check_actor_domain,
     check_is_apub_id_valid,
     create_tombstone,
@@ -134,13 +135,12 @@ impl ApubObjectType for PrivateMessage {
 
     insert_activity(creator.id, create.clone(), true, context.pool()).await?;
 
-    send_activity(
-      context.client(),
-      &create.into_any_base()?,
-      creator,
-      vec![to],
-    )
-    .await?;
+    let message = SendUserActivity {
+      activity: create.into_any_base()?,
+      actor: creator.to_owned(),
+      to: vec![to],
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -160,13 +160,12 @@ impl ApubObjectType for PrivateMessage {
 
     insert_activity(creator.id, update.clone(), true, context.pool()).await?;
 
-    send_activity(
-      context.client(),
-      &update.into_any_base()?,
-      creator,
-      vec![to],
-    )
-    .await?;
+    let message = SendUserActivity {
+      activity: update.into_any_base()?,
+      actor: creator.to_owned(),
+      to: vec![to],
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -185,13 +184,12 @@ impl ApubObjectType for PrivateMessage {
 
     insert_activity(creator.id, delete.clone(), true, context.pool()).await?;
 
-    send_activity(
-      context.client(),
-      &delete.into_any_base()?,
-      creator,
-      vec![to],
-    )
-    .await?;
+    let message = SendUserActivity {
+      activity: delete.into_any_base()?,
+      actor: creator.to_owned(),
+      to: vec![to],
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -221,7 +219,12 @@ impl ApubObjectType for PrivateMessage {
 
     insert_activity(creator.id, undo.clone(), true, context.pool()).await?;
 
-    send_activity(context.client(), &undo.into_any_base()?, creator, vec![to]).await?;
+    let message = SendUserActivity {
+      activity: undo.into_any_base()?,
+      actor: creator.to_owned(),
+      to: vec![to],
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 

server/src/apub/user.rs

@@ -1,7 +1,8 @@
 use crate::{
   api::{check_slurs, check_slurs_opt},
   apub::{
-    activities::{generate_activity_id, send_activity},
+    activities::generate_activity_id,
+    activity_sender::SendUserActivity,
     check_actor_domain,
     create_apub_response,
     fetcher::get_or_fetch_and_upsert_actor,
@@ -127,7 +128,12 @@ impl ActorType for User_ {
 
     insert_activity(self.id, follow.clone(), true, context.pool()).await?;
 
-    send_activity(context.client(), &follow.into_any_base()?, self, vec![to]).await?;
+    let message = SendUserActivity {
+      activity: follow.into_any_base()?,
+      actor: self.to_owned(),
+      to: vec![to],
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 
@@ -152,7 +158,12 @@ impl ActorType for User_ {
 
     insert_activity(self.id, undo.clone(), true, context.pool()).await?;
 
-    send_activity(context.client(), &undo.into_any_base()?, self, vec![to]).await?;
+    let message = SendUserActivity {
+      activity: undo.into_any_base()?,
+      actor: self.to_owned(),
+      to: vec![to],
+    };
+    context.activity_sender().send(message).await??;
     Ok(())
   }
 

server/src/lib.rs

@@ -33,6 +33,8 @@ use crate::{
   request::{retry, RecvError},
   websocket::server::ChatServer,
 };
+
+use crate::apub::activity_sender::ActivitySender;
 use actix::Addr;
 use actix_web::{client::Client, dev::ConnectionInfo};
 use anyhow::anyhow;
@@ -75,14 +77,21 @@ pub struct LemmyContext {
   pub pool: DbPool,
   pub chat_server: Addr<ChatServer>,
   pub client: Client,
+  pub activity_sender: Addr<ActivitySender>,
 }
 
 impl LemmyContext {
-  pub fn create(pool: DbPool, chat_server: Addr<ChatServer>, client: Client) -> LemmyContext {
+  pub fn create(
+    pool: DbPool,
+    chat_server: Addr<ChatServer>,
+    client: Client,
+    activity_sender: Addr<ActivitySender>,
+  ) -> LemmyContext {
     LemmyContext {
       pool,
       chat_server,
       client,
+      activity_sender,
     }
   }
   pub fn pool(&self) -> &DbPool {
@@ -94,6 +103,9 @@ impl LemmyContext {
   pub fn client(&self) -> &Client {
     &self.client
   }
+  pub fn activity_sender(&self) -> &Addr<ActivitySender> {
+    &self.activity_sender
+  }
 }
 
 impl Clone for LemmyContext {
@@ -102,6 +114,7 @@ impl Clone for LemmyContext {
       pool: self.pool.clone(),
       chat_server: self.chat_server.clone(),
       client: self.client.clone(),
+      activity_sender: self.activity_sender.clone(),
     }
   }
 }

server/src/main.rs

@@ -20,6 +20,7 @@ use diesel::{
 };
 use lemmy_db::get_database_url_from_env;
 use lemmy_server::{
+  apub::activity_sender::ActivitySender,
   blocking,
   code_migrations::run_advanced_migrations,
   rate_limit::{rate_limiter::RateLimiter, RateLimit},
@@ -76,9 +77,20 @@ async fn main() -> Result<(), LemmyError> {
 
   // Create Http server with websocket support
   HttpServer::new(move || {
-    let chat_server =
-      ChatServer::startup(pool.clone(), rate_limiter.clone(), Client::default()).start();
-    let context = LemmyContext::create(pool.clone(), chat_server, Client::default());
+    let activity_sender = ActivitySender::startup(Client::default()).start();
+    let chat_server = ChatServer::startup(
+      pool.clone(),
+      rate_limiter.clone(),
+      Client::default(),
+      activity_sender.clone(),
+    )
+    .start();
+    let context = LemmyContext::create(
+      pool.clone(),
+      chat_server,
+      Client::default(),
+      activity_sender,
+    );
     let settings = Settings::get();
     let rate_limiter = rate_limiter.clone();
     App::new()

server/src/request.rs

@@ -19,7 +19,7 @@ where
   retry_custom(|| async { Ok((f)().await) }).await
 }
 
-pub async fn retry_custom<F, Fut, T>(f: F) -> Result<T, LemmyError>
+async fn retry_custom<F, Fut, T>(f: F) -> Result<T, LemmyError>
 where
   F: Fn() -> Fut,
   Fut: Future<Output = Result<Result<T, actix_web::client::SendRequestError>, LemmyError>>,

server/src/websocket/server.rs

@@ -5,6 +5,7 @@
 use super::*;
 use crate::{
   api::{comment::*, community::*, post::*, site::*, user::*, *},
+  apub::activity_sender::ActivitySender,
   rate_limit::RateLimit,
   websocket::UserOperation,
   CommunityId,
@@ -181,6 +182,8 @@ pub struct ChatServer {
 
   /// An HTTP Client
   client: Client,
+
+  activity_sender: Addr<ActivitySender>,
 }
 
 impl ChatServer {
@@ -188,6 +191,7 @@ impl ChatServer {
     pool: Pool<ConnectionManager<PgConnection>>,
     rate_limiter: RateLimit,
     client: Client,
+    activity_sender: Addr<ActivitySender>,
   ) -> ChatServer {
     ChatServer {
       sessions: HashMap::new(),
@@ -199,6 +203,7 @@ impl ChatServer {
       rate_limiter,
       captchas: Vec::new(),
       client,
+      activity_sender,
     }
   }
 
@@ -455,6 +460,7 @@ impl ChatServer {
     };
 
     let client = self.client.clone();
+    let activity_sender = self.activity_sender.clone();
     async move {
       let msg = msg;
       let json: Value = serde_json::from_str(&msg.msg)?;
@@ -469,6 +475,7 @@ impl ChatServer {
         pool,
         chat_server: addr,
         client,
+        activity_sender,
       };
       let args = Args {
         context: &context,