feat: custom gossip implementation (#181)

* .

* rename global to app_state

* refactor event tracker

* gossip

* .

* .

crates/app_state/src/lib.rs

@@ -0,0 +1,44 @@
+use std::sync::OnceLock;
+use std::time::Duration;
+
+use nostr_lmdb::NostrLMDB;
+use nostr_sdk::prelude::*;
+use paths::nostr_file;
+
+use crate::state::AppState;
+
+pub mod constants;
+pub mod paths;
+pub mod state;
+
+static APP_STATE: OnceLock<AppState> = OnceLock::new();
+static NOSTR_CLIENT: OnceLock<Client> = OnceLock::new();
+
+/// Initialize the application state.
+pub fn app_state() -> &'static AppState {
+    APP_STATE.get_or_init(AppState::new)
+}
+
+/// Initialize the nostr client.
+pub fn nostr_client() -> &'static Client {
+    NOSTR_CLIENT.get_or_init(|| {
+        // rustls uses the `aws_lc_rs` provider by default
+        // This only errors if the default provider has already
+        // been installed. We can ignore this `Result`.
+        rustls::crypto::aws_lc_rs::default_provider()
+            .install_default()
+            .ok();
+
+        let lmdb = NostrLMDB::open(nostr_file()).expect("Database is NOT initialized");
+
+        let opts = ClientOptions::new()
+            .gossip(false)
+            .automatic_authentication(false)
+            .verify_subscriptions(false)
+            .sleep_when_idle(SleepWhenIdle::Enabled {
+                timeout: Duration::from_secs(600),
+            });
+
+        ClientBuilder::default().database(lmdb).opts(opts).build()
+    })
+}