From d2f406e0e8aff98b9ee7251d02add51e396c7522 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20K=C3=B6sters?= <timo@koesters.xyz>
Date: Fri, 6 Aug 2021 20:00:08 +0200
Subject: [PATCH] fix: handle bad events in db better

---
 src/database.rs      |  4 +--
 src/server_server.rs | 74 +++++++++++++++++++++++---------------------
 2 files changed, 41 insertions(+), 37 deletions(-)

diff --git a/src/database.rs b/src/database.rs
index 4b7c7fe8..bdff386f 100644
--- a/src/database.rs
+++ b/src/database.rs
@@ -270,8 +270,8 @@ impl Database {
 
                 eventid_outlierpdu: builder.open_tree("eventid_outlierpdu")?,
                 referencedevents: builder.open_tree("referencedevents")?,
-                pdu_cache: Mutex::new(LruCache::new(0)),
-                auth_chain_cache: Mutex::new(LruCache::new(0)),
+                pdu_cache: Mutex::new(LruCache::new(1_000_000)),
+                auth_chain_cache: Mutex::new(LruCache::new(1_000_000)),
             },
             account_data: account_data::AccountData {
                 roomuserdataid_accountdata: builder.open_tree("roomuserdataid_accountdata")?,
diff --git a/src/server_server.rs b/src/server_server.rs
index 9ae42ad6..9a847c33 100644
--- a/src/server_server.rs
+++ b/src/server_server.rs
@@ -666,14 +666,12 @@ pub async fn send_transaction_message_route(
         drop(mutex_lock);
 
         let elapsed = start_time.elapsed();
-        if elapsed > Duration::from_secs(1) {
-            warn!(
-                "Handling event {} took {}m{}s",
-                event_id,
-                elapsed.as_secs() / 60,
-                elapsed.as_secs() % 60
-            );
-        }
+        warn!(
+            "Handling event {} took {}m{}s",
+            event_id,
+            elapsed.as_secs() / 60,
+            elapsed.as_secs() % 60
+        );
     }
 
     for pdu in &resolved_map {
@@ -1271,7 +1269,6 @@ pub fn handle_incoming_pdu<'a>(
         } else if fork_states.iter().skip(1).all(|f| &fork_states[0] == f) {
             // There was only one state, so it has to be the room's current state (because that is
             // always included)
-            warn!("Skipping stateres because there is no new state.");
             fork_states[0]
                 .iter()
                 .map(|(k, pdu)| (k.clone(), pdu.event_id.clone()))
@@ -1411,12 +1408,12 @@ pub(crate) fn fetch_and_handle_events<'a>(
             // a. Look in the main timeline (pduid_pdu tree)
             // b. Look at outlier pdu tree
             // (get_pdu checks both)
-            let pdu = match db.rooms.get_pdu(&id)? {
-                Some(pdu) => {
+            let pdu = match db.rooms.get_pdu(&id) {
+                Ok(Some(pdu)) => {
                     trace!("Found {} in db", id);
                     pdu
                 }
-                None => {
+                Ok(None) => {
                     // c. Ask origin server over federation
                     debug!("Fetching {} over federation.", id);
                     match db
@@ -1431,7 +1428,11 @@ pub(crate) fn fetch_and_handle_events<'a>(
                         Ok(res) => {
                             debug!("Got {} over federation", id);
                             let (event_id, mut value) =
-                                crate::pdu::gen_event_id_canonical_json(&res.pdu)?;
+                                match crate::pdu::gen_event_id_canonical_json(&res.pdu) {
+                                    Ok(t) => t,
+                                    Err(_) => continue,
+                                };
+
                             // This will also fetch the auth chain
                             match handle_incoming_pdu(
                                 origin,
@@ -1474,6 +1475,10 @@ pub(crate) fn fetch_and_handle_events<'a>(
                         }
                     }
                 }
+                Err(e) => {
+                    debug!("Error loading {}: {}", id, e);
+                    continue;
+                }
             };
             pdus.push(pdu);
         }
@@ -1728,44 +1733,47 @@ fn get_auth_chain(starting_events: Vec<EventId>, db: &Database) -> Result<HashSe
     let mut full_auth_chain = HashSet::new();
 
     let mut cache = db.rooms.auth_chain_cache();
-    if let Some(cached) = cache.get_mut(&starting_events) {
-        return Ok(cached.clone());
-    }
 
     for event_id in &starting_events {
         if let Some(cached) = cache.get_mut(&[event_id.clone()][..]) {
             full_auth_chain.extend(cached.iter().cloned());
         } else {
             drop(cache);
-            let auth_chain = get_auth_chain_recursive(&event_id, HashSet::new(), db)?;
+            let mut auth_chain = HashSet::new();
+            get_auth_chain_recursive(&event_id, &mut auth_chain, db)?;
             cache = db.rooms.auth_chain_cache();
             cache.insert(vec![event_id.clone()], auth_chain.clone());
             full_auth_chain.extend(auth_chain);
         };
     }
 
-    cache.insert(starting_events, full_auth_chain.clone());
-
     Ok(full_auth_chain)
 }
 
 fn get_auth_chain_recursive(
     event_id: &EventId,
-    mut found: HashSet<EventId>,
+    found: &mut HashSet<EventId>,
     db: &Database,
-) -> Result<HashSet<EventId>> {
-    if let Some(pdu) = db.rooms.get_pdu(&event_id)? {
-        for auth_event in &pdu.auth_events {
-            if !found.contains(auth_event) {
-                found.insert(auth_event.clone());
-                found = get_auth_chain_recursive(&auth_event, found, db)?;
+) -> Result<()> {
+    let r = db.rooms.get_pdu(&event_id);
+    match r {
+        Ok(Some(pdu)) => {
+            for auth_event in &pdu.auth_events {
+                if !found.contains(auth_event) {
+                    found.insert(auth_event.clone());
+                    get_auth_chain_recursive(&auth_event, found, db)?;
+                }
             }
         }
-    } else {
-        warn!("Could not find pdu mentioned in auth events.");
+        Ok(None) => {
+            warn!("Could not find pdu mentioned in auth events.");
+        }
+        Err(e) => {
+            warn!("Could not load event in auth chain: {}", e);
+        }
     }
 
-    Ok(found)
+    Ok(())
 }
 
 #[cfg_attr(
@@ -1860,12 +1868,8 @@ pub fn get_event_authorization_route(
     Ok(get_event_authorization::v1::Response {
         auth_chain: auth_chain_ids
             .into_iter()
-            .map(|id| {
-                Ok::<_, Error>(PduEvent::convert_to_outgoing_federation_event(
-                    db.rooms.get_pdu_json(&id)?.unwrap(),
-                ))
-            })
-            .filter_map(|r| r.ok())
+            .filter_map(|id| Some(db.rooms.get_pdu_json(&id).ok()??))
+            .map(|event| PduEvent::convert_to_outgoing_federation_event(event))
             .collect(),
     }
     .into())