Merge #1267: Overhaul core Tracker: add integration test

35ca428 test: [#1266] add integartion test for bittorrent_tracker_core lib (Jose Celano)

Pull request description:

  Overhaul core Tracker: add integration test.

  I have added an integration test as documentation about how to use the lib. That functionality is already covered by unit tests.

ACKs for top commit:
  josecelano:
    ACK 35ca428

Tree-SHA512: 7195520fa544dc0b3052ce05101255f47f8a767a5122125561a4bfa5b157cf2007dd87d5476be44a6e75e8d3891d7501819d012404a0f3adbdc0630d64cfdf4c

packages/tracker-core/tests/integration.rs

@@ -0,0 +1,132 @@
+use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+use std::str::FromStr;
+use std::sync::Arc;
+
+use aquatic_udp_protocol::{AnnounceEvent, NumberOfBytes, PeerId};
+use bittorrent_primitives::info_hash::InfoHash;
+use bittorrent_tracker_core::announce_handler::{AnnounceHandler, PeersWanted};
+use bittorrent_tracker_core::databases::setup::initialize_database;
+use bittorrent_tracker_core::scrape_handler::ScrapeHandler;
+use bittorrent_tracker_core::torrent::repository::in_memory::InMemoryTorrentRepository;
+use bittorrent_tracker_core::torrent::repository::persisted::DatabasePersistentTorrentRepository;
+use bittorrent_tracker_core::whitelist;
+use bittorrent_tracker_core::whitelist::repository::in_memory::InMemoryWhitelist;
+use torrust_tracker_configuration::Core;
+use torrust_tracker_primitives::peer::Peer;
+use torrust_tracker_primitives::DurationSinceUnixEpoch;
+use torrust_tracker_test_helpers::configuration::ephemeral_sqlite_database;
+
+/// # Panics
+///
+/// Will panic if the temporary file path is not a valid UTF-8 string.
+#[must_use]
+pub fn ephemeral_configuration() -> Core {
+    let mut config = Core::default();
+
+    let temp_file = ephemeral_sqlite_database();
+    temp_file.to_str().unwrap().clone_into(&mut config.database.path);
+
+    config
+}
+
+/// # Panics
+///
+/// Will panic if the string representation of the info hash is not a valid infohash.
+#[must_use]
+pub fn sample_info_hash() -> InfoHash {
+    "3b245504cf5f11bbdbe1201cea6a6bf45aee1bc0" // DevSkim: ignore DS173237
+        .parse::<InfoHash>()
+        .expect("String should be a valid info hash")
+}
+
+/// Sample peer whose state is not relevant for the tests.
+#[must_use]
+pub fn sample_peer() -> Peer {
+    Peer {
+        peer_id: PeerId(*b"-qB00000000000000000"),
+        peer_addr: SocketAddr::new(remote_client_ip(), 8080),
+        updated: DurationSinceUnixEpoch::new(1_669_397_478_934, 0),
+        uploaded: NumberOfBytes::new(0),
+        downloaded: NumberOfBytes::new(0),
+        left: NumberOfBytes::new(0), // No bytes left to download
+        event: AnnounceEvent::Completed,
+    }
+}
+
+// The client peer IP.
+#[must_use]
+fn remote_client_ip() -> IpAddr {
+    IpAddr::V4(Ipv4Addr::from_str("126.0.0.1").unwrap())
+}
+
+struct Container {
+    pub announce_handler: Arc<AnnounceHandler>,
+    pub scrape_handler: Arc<ScrapeHandler>,
+}
+
+impl Container {
+    pub fn initialize(config: &Core) -> Self {
+        let database = initialize_database(config);
+        let in_memory_torrent_repository = Arc::new(InMemoryTorrentRepository::default());
+        let db_torrent_repository = Arc::new(DatabasePersistentTorrentRepository::new(&database));
+        let in_memory_whitelist = Arc::new(InMemoryWhitelist::default());
+        let whitelist_authorization = Arc::new(whitelist::authorization::WhitelistAuthorization::new(
+            config,
+            &in_memory_whitelist.clone(),
+        ));
+        let announce_handler = Arc::new(AnnounceHandler::new(
+            config,
+            &in_memory_torrent_repository,
+            &db_torrent_repository,
+        ));
+        let scrape_handler = Arc::new(ScrapeHandler::new(&whitelist_authorization, &in_memory_torrent_repository));
+
+        Self {
+            announce_handler,
+            scrape_handler,
+        }
+    }
+}
+
+#[tokio::test]
+async fn test_announce_and_scrape_requests() {
+    let config = ephemeral_configuration();
+
+    let container = Container::initialize(&config);
+
+    let info_hash = sample_info_hash();
+
+    let mut peer = sample_peer();
+
+    // Announce
+
+    // First announce: download started
+    peer.event = AnnounceEvent::Started;
+    let announce_data =
+        container
+            .announce_handler
+            .announce(&info_hash, &mut peer, &remote_client_ip(), &PeersWanted::AsManyAsPossible);
+
+    // NOTICE: you don't get back the peer making the request.
+    assert_eq!(announce_data.peers.len(), 0);
+    assert_eq!(announce_data.stats.downloaded, 0);
+
+    // Second announce: download completed
+    peer.event = AnnounceEvent::Completed;
+    let announce_data =
+        container
+            .announce_handler
+            .announce(&info_hash, &mut peer, &remote_client_ip(), &PeersWanted::AsManyAsPossible);
+
+    assert_eq!(announce_data.peers.len(), 0);
+    assert_eq!(announce_data.stats.downloaded, 1);
+
+    // Scrape
+
+    let scrape_data = container.scrape_handler.scrape(&vec![info_hash]).await;
+
+    assert!(scrape_data.files.contains_key(&info_hash));
+}
+
+#[test]
+fn test_scrape_request() {}