Add an integration test for snapshot syncing

Cargo.lock

@@ -2473,6 +2473,8 @@ dependencies = [
  "actix-rt",
  "actix-web",
  "anyhow",
+ "env_logger 0.8.4",
+ "log",
  "pretty_assertions",
  "taskchampion",
  "taskchampion-sync-server",

replica-server-tests/Cargo.toml

@@ -17,3 +17,5 @@ actix-web = "^3.3.2"
 actix-rt = "^1.1.1"
 tempfile = "3"
 pretty_assertions = "1"
+log = "^0.4.14"
+env_logger = "^0.8.3"

replica-server-tests/tests/cross-sync.rs

@@ -5,6 +5,11 @@ use taskchampion_sync_server::{storage::InMemoryStorage, Server};
 
 #[actix_rt::test]
 async fn cross_sync() -> anyhow::Result<()> {
+    let _ = env_logger::builder()
+        .is_test(true)
+        .filter_level(log::LevelFilter::Trace)
+        .try_init();
+
     let server = Server::new(Default::default(), Box::new(InMemoryStorage::new()));
     let httpserver =
         HttpServer::new(move || App::new().configure(|sc| server.config(sc))).bind("0.0.0.0:0")?;

replica-server-tests/tests/snapshots.rs

@@ -0,0 +1,94 @@
+use actix_web::{App, HttpServer};
+use pretty_assertions::assert_eq;
+use taskchampion::{Replica, ServerConfig, Status, StorageConfig, Uuid};
+use taskchampion_sync_server::{
+    storage::InMemoryStorage, Server, ServerConfig as SyncServerConfig,
+};
+
+const NUM_VERSIONS: u32 = 50;
+
+#[actix_rt::test]
+async fn sync_with_snapshots() -> anyhow::Result<()> {
+    let _ = env_logger::builder()
+        .is_test(true)
+        .filter_level(log::LevelFilter::Trace)
+        .try_init();
+
+    let sync_server_config = SyncServerConfig {
+        snapshot_days: 100,
+        snapshot_versions: 3,
+    };
+    let server = Server::new(sync_server_config, Box::new(InMemoryStorage::new()));
+    let httpserver =
+        HttpServer::new(move || App::new().configure(|sc| server.config(sc))).bind("0.0.0.0:0")?;
+
+    // bind was to :0, so the kernel will have selected an unused port
+    let port = httpserver.addrs()[0].port();
+
+    httpserver.run();
+
+    let client_key = Uuid::new_v4();
+    let encryption_secret = b"abc123".to_vec();
+    let make_server = || {
+        ServerConfig::Remote {
+            origin: format!("http://127.0.0.1:{}", port),
+            client_key,
+            encryption_secret: encryption_secret.clone(),
+        }
+        .into_server()
+    };
+
+    // first we set up a single replica and sync it a lot of times, to establish a sync history.
+    let mut rep1 = Replica::new(StorageConfig::InMemory.into_storage()?);
+    let mut serv1 = make_server()?;
+
+    let mut t1 = rep1.new_task(Status::Pending, "test 1".into())?;
+    log::info!("Applying modifications on replica 1");
+    for i in 0..=NUM_VERSIONS {
+        let mut t1m = t1.into_mut(&mut rep1);
+        t1m.start()?;
+        t1m.stop()?;
+        t1m.set_description(format!("revision {}", i))?;
+        t1 = t1m.into_immut();
+
+        rep1.sync(&mut serv1, false)?;
+    }
+
+    // now set up a second replica and sync it; it should catch up on that history, using a
+    // snapshot.  Note that we can't verify that it used a snapshot, because the server currently
+    // keeps all versions (so rep2 could sync from the beginning of the version history).  You can
+    // manually verify that it is applying a snapshot by adding `assert!(false)` below and skimming
+    // the logs.
+
+    let mut rep2 = Replica::new(StorageConfig::InMemory.into_storage()?);
+    let mut serv2 = make_server()?;
+
+    log::info!("Syncing replica 2");
+    rep2.sync(&mut serv2, false)?;
+
+    // those tasks should exist on rep2 now
+    let t12 = rep2
+        .get_task(t1.get_uuid())?
+        .expect("expected task 1 on rep2");
+
+    assert_eq!(t12.get_description(), format!("revision {}", NUM_VERSIONS));
+    assert_eq!(t12.is_active(), false);
+
+    // sync that back to replica 1
+    t12.into_mut(&mut rep2)
+        .set_description("sync-back".to_owned())?;
+    rep2.sync(&mut serv2, false)?;
+    rep1.sync(&mut serv1, false)?;
+
+    let t11 = rep1
+        .get_task(t1.get_uuid())?
+        .expect("expected task 1 on rep1");
+
+    assert_eq!(t11.get_description(), "sync-back");
+
+    // uncomment this to force a failure and see the logs
+    // assert!(false);
+
+    // note that we just drop the server here..
+    Ok(())
+}