implement multi_subscriber for Thread

Signed-off-by: kernelkind <kernelkind@gmail.com>

src/actionbar.rs

@@ -1,4 +1,5 @@
 use crate::{
+    multi_subscriber::MultiSubscriber,
     note::NoteRef,
     notecache::NoteCache,
     route::{Route, Router},
@@ -6,8 +7,6 @@ use crate::{
 };
 use enostr::{NoteId, RelayPool};
 use nostrdb::{Ndb, Transaction};
-use tracing::{error, info};
-use uuid::Uuid;
 
 #[derive(Debug, Eq, PartialEq, Copy, Clone)]
 pub enum BarAction {
@@ -69,42 +68,15 @@ fn open_thread(
         ThreadResult::Fresh(thread) => (thread, None),
     };
 
-    // only start a subscription on nav and if we don't have
-    // an active subscription for this thread.
-    if thread.subscription().is_none() {
-        let filters = Thread::filters(root_id);
-        *thread.subscription_mut() = ndb.subscribe(&filters).ok();
-
-        if thread.remote_subscription().is_some() {
-            error!("Found active remote subscription when it was not expected");
-        } else {
-            let subid = Uuid::new_v4().to_string();
-            *thread.remote_subscription_mut() = Some(subid.clone());
-            pool.subscribe(subid, filters);
-        }
-
-        match thread.subscription() {
-            Some(_sub) => {
-                thread.subscribers += 1;
-                info!(
-                    "Locally/remotely subscribing to thread. {} total active subscriptions, {} on this thread",
-                    ndb.subscription_count(),
-                    thread.subscribers,
-                );
-            }
-            None => error!(
-                "Error subscribing locally to selected note '{}''s thread",
-                hex::encode(selected_note)
-            ),
-        }
+    let multi_subscriber = if let Some(multi_subscriber) = &mut thread.multi_subscriber {
+        multi_subscriber
     } else {
-        thread.subscribers += 1;
-        info!(
-            "Re-using existing thread subscription. {} total active subscriptions, {} on this thread",
-            ndb.subscription_count(),
-            thread.subscribers,
-        )
-    }
+        let filters = Thread::filters(root_id);
+        thread.multi_subscriber = Some(MultiSubscriber::new(filters));
+        thread.multi_subscriber.as_mut().unwrap()
+    };
+
+    multi_subscriber.subscribe(ndb, pool);
 
     result
 }

src/multi_subscriber.rs

@@ -1,9 +1,9 @@
 use enostr::{Filter, RelayPool};
-use nostrdb::Ndb;
-use tracing::{error, info};
+use nostrdb::{Ndb, Note, Transaction};
+use tracing::{debug, error, info};
 use uuid::Uuid;
 
-use crate::filter::UnifiedSubscription;
+use crate::{filter::UnifiedSubscription, note::NoteRef, Error};
 
 pub struct MultiSubscriber {
     filters: Vec<Filter>,
@@ -104,4 +104,30 @@ impl MultiSubscriber {
             )
         }
     }
+
+    pub fn poll_for_notes(&mut self, ndb: &Ndb, txn: &Transaction) -> Result<Vec<NoteRef>, Error> {
+        let sub = self.sub.as_ref().ok_or(Error::no_active_sub())?;
+        let new_note_keys = ndb.poll_for_notes(sub.local, 500);
+
+        if new_note_keys.is_empty() {
+            return Ok(vec![]);
+        } else {
+            debug!("{} new notes! {:?}", new_note_keys.len(), new_note_keys);
+        }
+
+        let mut notes: Vec<Note<'_>> = Vec::with_capacity(new_note_keys.len());
+        for key in new_note_keys {
+            let note = if let Ok(note) = ndb.get_note_by_key(txn, key) {
+                note
+            } else {
+                continue;
+            };
+
+            notes.push(note);
+        }
+
+        let note_refs: Vec<NoteRef> = notes.iter().map(|n| NoteRef::from_note(n)).collect();
+
+        Ok(note_refs)
+    }
 }

src/thread.rs

@@ -1,27 +1,19 @@
 use crate::{
+    multi_subscriber::MultiSubscriber,
     note::NoteRef,
     notecache::NoteCache,
     timeline::{TimelineTab, ViewFilter},
     Error, Result,
 };
 use enostr::RelayPool;
-use nostrdb::{Filter, FilterBuilder, Ndb, Note, Subscription, Transaction};
-use std::cmp::Ordering;
+use nostrdb::{Filter, FilterBuilder, Ndb, Transaction};
 use std::collections::HashMap;
-use tracing::{debug, error, info, warn};
+use tracing::{debug, warn};
 
 #[derive(Default)]
 pub struct Thread {
     view: TimelineTab,
-    sub: Option<Subscription>,
-    remote_sub: Option<String>,
-    pub subscribers: i32,
-}
-
-#[derive(Debug, Eq, PartialEq, Copy, Clone)]
-pub enum DecrementResult {
-    LastSubscriber(Subscription),
-    ActiveSubscribers,
+    pub multi_subscriber: Option<MultiSubscriber>,
 }
 
 impl Thread {
@@ -32,15 +24,10 @@ impl Thread {
         }
         let mut view = TimelineTab::new_with_capacity(ViewFilter::NotesAndReplies, cap);
         view.notes = notes;
-        let sub: Option<Subscription> = None;
-        let remote_sub: Option<String> = None;
-        let subscribers: i32 = 0;
 
         Thread {
             view,
-            sub,
-            remote_sub,
-            subscribers,
+            multi_subscriber: None,
         }
     }
 
@@ -53,37 +40,18 @@ impl Thread {
     }
 
     #[must_use = "UnknownIds::update_from_note_refs should be used on this result"]
-    pub fn poll_notes_into_view<'a>(
-        &mut self,
-        txn: &'a Transaction,
-        ndb: &Ndb,
-    ) -> Result<Vec<Note<'a>>> {
-        let sub = self.subscription().expect("thread subscription");
-        let new_note_keys = ndb.poll_for_notes(sub, 500);
-        if new_note_keys.is_empty() {
-            return Ok(vec![]);
-        } else {
-            debug!("{} new notes! {:?}", new_note_keys.len(), new_note_keys);
-        }
-
-        let mut notes: Vec<Note<'a>> = Vec::with_capacity(new_note_keys.len());
-        for key in new_note_keys {
-            let note = if let Ok(note) = ndb.get_note_by_key(txn, key) {
-                note
-            } else {
-                continue;
-            };
-
-            notes.push(note);
-        }
-
-        {
+    pub fn poll_notes_into_view(&mut self, txn: &Transaction, ndb: &Ndb) -> Result<()> {
+        if let Some(multi_subscriber) = &mut self.multi_subscriber {
             let reversed = true;
-            let note_refs: Vec<NoteRef> = notes.iter().map(|n| NoteRef::from_note(n)).collect();
+            let note_refs: Vec<NoteRef> = multi_subscriber.poll_for_notes(ndb, txn)?;
             self.view.insert(&note_refs, reversed);
+        } else {
+            return Err(Error::Generic(
+                "Thread unexpectedly has no MultiSubscriber".to_owned(),
+            ));
         }
 
-        Ok(notes)
+        Ok(())
     }
 
     /// Look for new thread notes since our last fetch
@@ -112,38 +80,6 @@ impl Thread {
         }
     }
 
-    pub fn decrement_sub(&mut self) -> Result<DecrementResult> {
-        self.subscribers -= 1;
-
-        match self.subscribers.cmp(&0) {
-            Ordering::Equal => {
-                if let Some(sub) = self.subscription() {
-                    Ok(DecrementResult::LastSubscriber(sub))
-                } else {
-                    Err(Error::no_active_sub())
-                }
-            }
-            Ordering::Less => Err(Error::unexpected_sub_count(self.subscribers)),
-            Ordering::Greater => Ok(DecrementResult::ActiveSubscribers),
-        }
-    }
-
-    pub fn subscription(&self) -> Option<Subscription> {
-        self.sub
-    }
-
-    pub fn remote_subscription(&self) -> &Option<String> {
-        &self.remote_sub
-    }
-
-    pub fn remote_subscription_mut(&mut self) -> &mut Option<String> {
-        &mut self.remote_sub
-    }
-
-    pub fn subscription_mut(&mut self) -> &mut Option<Subscription> {
-        &mut self.sub
-    }
-
     fn filters_raw(root: &[u8; 32]) -> Vec<FilterBuilder> {
         vec![
             nostrdb::Filter::new().kinds([1]).event(root),
@@ -253,59 +189,12 @@ pub fn thread_unsubscribe(
     note_cache: &mut NoteCache,
     id: &[u8; 32],
 ) {
-    let (unsubscribe, remote_subid) = {
-        let txn = Transaction::new(ndb).expect("txn");
-        let root_id = crate::note::root_note_id_from_selected_id(ndb, note_cache, &txn, id);
+    let txn = Transaction::new(ndb).expect("txn");
+    let root_id = crate::note::root_note_id_from_selected_id(ndb, note_cache, &txn, id);
 
-        let thread = threads.thread_mut(ndb, &txn, root_id).get_ptr();
-        let unsub = thread.decrement_sub();
+    let thread = threads.thread_mut(ndb, &txn, root_id).get_ptr();
 
-        let mut remote_subid: Option<String> = None;
-        if let Ok(DecrementResult::LastSubscriber(_subid)) = unsub {
-            *thread.subscription_mut() = None;
-            remote_subid = thread.remote_subscription().to_owned();
-            *thread.remote_subscription_mut() = None;
-        }
-
-        (unsub, remote_subid)
-    };
-
-    match unsubscribe {
-        Ok(DecrementResult::LastSubscriber(sub)) => {
-            if let Err(e) = ndb.unsubscribe(sub) {
-                error!(
-                    "failed to unsubscribe from thread: {e}, subid:{}, {} active subscriptions",
-                    sub.id(),
-                    ndb.subscription_count()
-                );
-            } else {
-                info!(
-                    "Unsubscribed from thread subid:{}. {} active subscriptions",
-                    sub.id(),
-                    ndb.subscription_count()
-                );
-            }
-
-            // unsub from remote
-            if let Some(subid) = remote_subid {
-                pool.unsubscribe(subid);
-            }
-        }
-
-        Ok(DecrementResult::ActiveSubscribers) => {
-            info!(
-                "Keeping thread subscription. {} active subscriptions.",
-                ndb.subscription_count()
-            );
-            // do nothing
-        }
-
-        Err(e) => {
-            // something is wrong!
-            error!(
-                "Thread unsubscribe error: {e}. {} active subsciptions.",
-                ndb.subscription_count()
-            );
-        }
+    if let Some(multi_subscriber) = &mut thread.multi_subscriber {
+        multi_subscriber.unsubscribe(ndb, pool);
     }
 }