nostrdb: initial Ndb class

nostrdb/Ndb.swift

@@ -0,0 +1,47 @@
+//
+//  Ndb.swift
+//  damus
+//
+//  Created by William Casarin on 2023-08-25.
+//
+
+import Foundation
+
+class Ndb {
+    let ndb: ndb_t
+
+    init?() {
+        var ndb_p: OpaquePointer? = nil
+
+        let dir = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first?.absoluteString.replacingOccurrences(of: "file://", with: "")
+
+        let ok = dir!.withCString { testdir in
+            return ndb_init(&ndb_p, testdir, 1024 * 1024 * 700, 4) != 0
+        }
+
+        if !ok {
+            return nil
+        }
+
+        self.ndb = ndb_t(ndb: ndb_p)
+    }
+
+    func lookup_note(_ id: NoteId) -> NdbNote? {
+        id.id.withUnsafeBytes { bs in
+            guard let note_p = ndb_get_note_by_id(ndb.ndb, bs) else {
+                return nil
+            }
+            return NdbNote(note: note_p, owned_size: nil)
+        }
+    }
+
+    func process_events(_ str: String) -> Bool {
+        return str.withCString { cstr in
+            return ndb_process_events(ndb.ndb, cstr, str.utf8.count) != 0
+        }
+    }
+
+    deinit {
+        ndb_destroy(ndb.ndb)
+    }
+}

nostrdb/Test/NdbTests.swift

@@ -31,6 +31,29 @@ final class NdbTests: XCTestCase {
 
     }
 
+    func test_ndb_init() {
+
+        do {
+            let ndb = Ndb()!
+            let ok = ndb.process_events(test_wire_events)
+            XCTAssertTrue(ok)
+        }
+
+        do {
+            let ndb = Ndb()!
+            let id1 = NoteId(hex: "d12c17bde3094ad32f4ab862a6cc6f5c289cfe7d5802270bdf34904df585f349")!
+            let note1 = ndb.lookup_note(id1)
+            XCTAssertNotNil(note1)
+            let id = NoteId(hex: "b2e03951843b191b5d9d1969f48db0156b83cc7dbd841f543f109362e24c4a9c")!
+            let note = ndb.lookup_note(id)
+            XCTAssertNotNil(note)
+            guard let note else { return }
+            XCTAssertEqual(note.pubkey, Pubkey(hex: "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245")!)
+        }
+
+
+    }
+
     func test_ndb_note() throws {
         let note = NdbNote.owned_from_json(json: test_contact_list_json)
         XCTAssertNotNil(note)