mirror of
https://github.com/LemmyNet/lemmy.git
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106 lines
3.5 KiB
Rust
106 lines
3.5 KiB
Rust
use crate::{
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fetcher::{fetch::fetch_remote_object, is_deleted, should_refetch_actor},
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inbox::user_inbox::receive_announce,
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objects::FromApub,
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GroupExt,
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};
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use activitystreams::{
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actor::ApActorExt,
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collection::{CollectionExt, OrderedCollection},
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};
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use anyhow::Context;
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use diesel::result::Error::NotFound;
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use lemmy_api_structs::blocking;
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use lemmy_db_queries::{source::community::Community_, ApubObject};
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use lemmy_db_schema::source::community::Community;
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use lemmy_utils::{location_info, LemmyError};
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use lemmy_websocket::LemmyContext;
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use log::debug;
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use url::Url;
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/// Get a community from its apub ID.
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///
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/// If it exists locally and `!should_refetch_actor()`, it is returned directly from the database.
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/// Otherwise it is fetched from the remote instance, stored and returned.
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pub(crate) async fn get_or_fetch_and_upsert_community(
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apub_id: &Url,
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context: &LemmyContext,
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recursion_counter: &mut i32,
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) -> Result<Community, LemmyError> {
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let apub_id_owned = apub_id.to_owned();
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let community = blocking(context.pool(), move |conn| {
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Community::read_from_apub_id(conn, &apub_id_owned.into())
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})
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.await?;
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match community {
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Ok(c) if !c.local && should_refetch_actor(c.last_refreshed_at) => {
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debug!("Fetching and updating from remote community: {}", apub_id);
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fetch_remote_community(apub_id, context, Some(c), recursion_counter).await
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}
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Ok(c) => Ok(c),
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Err(NotFound {}) => {
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debug!("Fetching and creating remote community: {}", apub_id);
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fetch_remote_community(apub_id, context, None, recursion_counter).await
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}
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Err(e) => Err(e.into()),
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}
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}
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/// Request a community by apub ID from a remote instance, including moderators. If `old_community`,
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/// is set, this is an update for a community which is already known locally. If not, we don't know
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/// the community yet and also pull the outbox, to get some initial posts.
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async fn fetch_remote_community(
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apub_id: &Url,
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context: &LemmyContext,
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old_community: Option<Community>,
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recursion_counter: &mut i32,
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) -> Result<Community, LemmyError> {
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let group = fetch_remote_object::<GroupExt>(context.client(), apub_id, recursion_counter).await;
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if let Some(c) = old_community.to_owned() {
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if is_deleted(&group) {
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blocking(context.pool(), move |conn| {
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Community::update_deleted(conn, c.id, true)
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})
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.await??;
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} else if group.is_err() {
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// If fetching failed, return the existing data.
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return Ok(c);
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}
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}
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let group = group?;
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let community =
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Community::from_apub(&group, context, apub_id.to_owned(), recursion_counter).await?;
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// only fetch outbox for new communities, otherwise this can create an infinite loop
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if old_community.is_none() {
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let outbox = group.inner.outbox()?.context(location_info!())?;
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fetch_community_outbox(context, outbox, &community, recursion_counter).await?
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}
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Ok(community)
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}
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async fn fetch_community_outbox(
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context: &LemmyContext,
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outbox: &Url,
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community: &Community,
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recursion_counter: &mut i32,
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) -> Result<(), LemmyError> {
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let outbox =
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fetch_remote_object::<OrderedCollection>(context.client(), outbox, recursion_counter).await?;
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let outbox_activities = outbox.items().context(location_info!())?.clone();
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let mut outbox_activities = outbox_activities.many().context(location_info!())?;
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if outbox_activities.len() > 20 {
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outbox_activities = outbox_activities[0..20].to_vec();
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}
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for activity in outbox_activities {
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receive_announce(context, activity, community, recursion_counter).await?;
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}
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Ok(())
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}
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