Revert "nostrdb: close database when backgrounded"

This reverts commit da2bdad18d.

This commit was reverted because it was causing crashes (Occasional `EXC_BAD_ACCESS` errors when accessing database transactions), and because the push notification extension uses Ndb in a read-only manner, which means we no longer need these changes

Signed-off-by: Daniel D’Aquino <daniel@daquino.me>

damus/ContentView.swift

@@ -448,25 +448,18 @@ struct ContentView: View {
                 break
             }
         }
-        .onReceive(NotificationCenter.default.publisher(for: UIApplication.willEnterForegroundNotification)) { obj in
-            print("📙 DAMUS ACTIVE NOTIFY")
-            try? damus_state.ndb.reopen()
-        }
         .onChange(of: scenePhase) { (phase: ScenePhase) in
-            guard let damus_state else { return }
             switch phase {
             case .background:
                 print("📙 DAMUS BACKGROUNDED")
-                Task { @MainActor in
-                    damus_state.ndb.close()
-                }
                 break
             case .inactive:
                 print("📙 DAMUS INACTIVE")
                 break
             case .active:
                 print("📙 DAMUS ACTIVE")
-                damus_state.pool.ping()
+                guard let ds = damus_state else { return }
+                ds.pool.ping()
             @unknown default:
                 break
             }

nostrdb/Ndb.swift

@@ -15,23 +15,8 @@ enum NdbSearchOrder {
     case newest_first
 }
 
-
-enum DatabaseError: Error {
-    case failed_open
-
-    var errorDescription: String? {
-        switch self {
-        case .failed_open:
-            return "Failed to open database"
-        }
-    }
-}
-
 class Ndb {
-    var ndb: ndb_t
-    let path: String?
-    let owns_db: Bool
-    var closed: Bool
+    let ndb: ndb_t
 
     static func safemode() -> Ndb? {
         guard let path = db_path ?? old_db_path else { return nil }
@@ -73,8 +58,8 @@ class Ndb {
     static var empty: Ndb {
         Ndb(ndb: ndb_t(ndb: nil))
     }
-    
-    static func open(path: String? = nil, owns_db_file: Bool = true) -> ndb_t? {
+
+    init?(path: String? = nil, owns_db_file: Bool = true) {
         var ndb_p: OpaquePointer? = nil
 
         let ingest_threads: Int32 = 4
@@ -117,20 +102,9 @@ class Ndb {
             return nil
         }
 
-        return ndb_t(ndb: ndb_p)
+        self.ndb = ndb_t(ndb: ndb_p)
     }
 
-    init?(path: String? = nil, owns_db_file: Bool = true) {
-        guard let db = Self.open(path: path, owns_db_file: owns_db_file) else {
-            return nil
-        }
-
-        self.path = path
-        self.owns_db = owns_db_file
-        self.ndb = db
-        self.closed = false
-    }
-    
     private static func migrate_db_location_if_needed() throws {
         guard let old_db_path, let db_path else {
             throw Errors.cannot_find_db_path
@@ -170,23 +144,6 @@ class Ndb {
 
     init(ndb: ndb_t) {
         self.ndb = ndb
-        self.path = nil
-        self.owns_db = true
-        self.closed = false
-    }
-    
-    func close() {
-        self.closed = true
-        ndb_destroy(self.ndb.ndb)
-    }
-
-    func reopen() throws {
-        guard self.closed,
-              let db = Self.open(path: self.path, owns_db_file: self.owns_db) else {
-            throw DatabaseError.failed_open
-        }
-
-        self.ndb = db
     }
 
     func lookup_note_by_key_with_txn<Y>(_ key: NoteKey, txn: NdbTxn<Y>) -> NdbNote? {
@@ -387,14 +344,12 @@ class Ndb {
     }
 
     func process_event(_ str: String) -> Bool {
-        guard !closed else { return false }
         return str.withCString { cstr in
             return ndb_process_event(ndb.ndb, cstr, Int32(str.utf8.count)) != 0
         }
     }
 
     func process_events(_ str: String) -> Bool {
-        guard !closed else { return false }
         return str.withCString { cstr in
             return ndb_process_events(ndb.ndb, cstr, str.utf8.count) != 0
         }
@@ -432,7 +387,7 @@ class Ndb {
     }
 
     deinit {
-        self.close()
+        ndb_destroy(ndb.ndb)
     }
 }
 

nostrdb/NdbTxn.swift

@@ -29,14 +29,7 @@ class NdbTxn<T> {
             self.inherited = true
         } else {
             self.txn = ndb_txn()
-            let ok = ndb_begin_query(ndb.ndb.ndb, &self.txn) != 0
-            if !ok {
-                self.moved = false
-                self.txn = ndb_txn()
-                self.inherited = true
-                self.val = with(self)
-                return
-            }
+            let _ = ndb_begin_query(ndb.ndb.ndb, &self.txn)
             Thread.current.threadDictionary["ndb_txn"] = self.txn
             self.inherited = false
         }