crates/apub/src/fetcher/mod.rs

   1 pub mod community;
   2 pub mod deletable_apub_object;
   3 mod fetch;
   4 pub mod object_id;
   5 pub mod post_or_comment;
   6 pub mod search;
   7
   8 use crate::fetcher::object_id::ObjectId;
   9 use chrono::NaiveDateTime;
  10 use lemmy_apub_lib::traits::ActorType;
  11 use lemmy_db_schema::{
  12   naive_now,
  13   source::{community::Community, person::Person},
  14 };
  15 use lemmy_utils::LemmyError;
  16 use lemmy_websocket::LemmyContext;
  17 use url::Url;
  18
  19 static ACTOR_REFETCH_INTERVAL_SECONDS: i64 = 24 * 60 * 60;
  20 static ACTOR_REFETCH_INTERVAL_SECONDS_DEBUG: i64 = 10;
  21
  22 /// Get a remote actor from its apub ID (either a person or a community). Thin wrapper around
  23 /// `get_or_fetch_and_upsert_person()` and `get_or_fetch_and_upsert_community()`.
  24 ///
  25 /// If it exists locally and `!should_refetch_actor()`, it is returned directly from the database.
  26 /// Otherwise it is fetched from the remote instance, stored and returned.
  27 pub(crate) async fn get_or_fetch_and_upsert_actor(
  28   apub_id: Url,
  29   context: &LemmyContext,
  30   recursion_counter: &mut i32,
  31 ) -> Result<Box<dyn ActorType>, LemmyError> {
  32   let community_id = ObjectId::<Community>::new(apub_id.clone());
  33   let community = community_id.dereference(context, recursion_counter).await;
  34   let actor: Box<dyn ActorType> = match community {
  35     Ok(c) => Box::new(c),
  36     Err(_) => {
  37       let person_id = ObjectId::new(apub_id);
  38       let person: Person = person_id.dereference(context, recursion_counter).await?;
  39       Box::new(person)
  40     }
  41   };
  42   Ok(actor)
  43 }
  44
  45 /// Determines when a remote actor should be refetched from its instance. In release builds, this is
  46 /// `ACTOR_REFETCH_INTERVAL_SECONDS` after the last refetch, in debug builds
  47 /// `ACTOR_REFETCH_INTERVAL_SECONDS_DEBUG`.
  48 ///
  49 /// TODO it won't pick up new avatars, summaries etc until a day after.
  50 /// Actors need an "update" activity pushed to other servers to fix this.
  51 fn should_refetch_actor(last_refreshed: NaiveDateTime) -> bool {
  52   let update_interval = if cfg!(debug_assertions) {
  53     // avoid infinite loop when fetching community outbox
  54     chrono::Duration::seconds(ACTOR_REFETCH_INTERVAL_SECONDS_DEBUG)
  55   } else {
  56     chrono::Duration::seconds(ACTOR_REFETCH_INTERVAL_SECONDS)
  57   };
  58   last_refreshed.lt(&(naive_now() - update_interval))
  59 }