feat: tests starting copro with existing local DB

Introduce the `COPROCESSOR_TEST_LOCAL_DB` environment variable that uses
an existing local DB, but starts coprocessor service instances.

fhevm-engine/coprocessor/src/tests/utils.rs

@@ -1,6 +1,7 @@
 use crate::cli::Args;
 use std::sync::atomic::{AtomicU16, Ordering};
 use testcontainers::{core::WaitFor, runners::AsyncRunner, GenericImage, ImageExt};
+use tokio::sync::watch::Receiver;
 
 pub struct TestInstance {
     // just to destroy container
@@ -41,28 +42,75 @@ pub fn default_tenant_id() -> i32 {
 pub async fn setup_test_app() -> Result<TestInstance, Box<dyn std::error::Error>> {
     if std::env::var("COPROCESSOR_TEST_LOCALHOST").is_ok() {
         setup_test_app_existing_localhost().await
+    } else if std::env::var("COPROCESSOR_TEST_LOCAL_DB").is_ok() {
+        setup_test_app_existing_db().await
     } else {
         setup_test_app_custom_docker().await
     }
 }
 
-pub async fn setup_test_app_existing_localhost() -> Result<TestInstance, Box<dyn std::error::Error>> {
+const LOCAL_DB_URL: &str = "postgresql://postgres:postgres@127.0.0.1:5432/coprocessor";
+
+async fn setup_test_app_existing_localhost() -> Result<TestInstance, Box<dyn std::error::Error>> {
     Ok(TestInstance {
         _container: None,
         app_close_channel: None,
         app_url: "http://127.0.0.1:50051".to_string(),
-        db_url: "postgresql://postgres:postgres@127.0.0.1:5432/coprocessor".to_string(),
+        db_url: LOCAL_DB_URL.to_string(),
     })
 }
 
-pub async fn setup_test_app_custom_docker() -> Result<TestInstance, Box<dyn std::error::Error>> {
+pub async fn setup_test_app_existing_db() -> Result<TestInstance, Box<dyn std::error::Error>> {
+    let app_port = get_app_port();
+    let (app_close_channel, rx) = tokio::sync::watch::channel(false);
+    start_coprocessor(rx, app_port, &LOCAL_DB_URL).await;
+    Ok(TestInstance {
+        _container: None,
+        app_close_channel: Some(app_close_channel),
+        app_url: format!("http://127.0.0.1:{app_port}"),
+        db_url: LOCAL_DB_URL.to_string(),
+    })
+}
+
+async fn start_coprocessor(rx: Receiver<bool>, app_port: u16, db_url: &str) {
+    let args: Args = Args {
+        run_bg_worker: true,
+        run_server: true,
+        generate_fhe_keys: false,
+        server_maximum_ciphertexts_to_schedule: 5000,
+        work_items_batch_size: 40,
+        tenant_key_cache_size: 4,
+        coprocessor_fhe_threads: 4,
+        maximum_handles_per_input: 255,
+        tokio_threads: 2,
+        pg_pool_max_connections: 2,
+        server_addr: format!("127.0.0.1:{app_port}"),
+        database_url: Some(db_url.to_string()),
+        maximimum_compact_inputs_upload: 10,
+        coprocessor_private_key: "./coprocessor.key".to_string(),
+    };
+
+    std::thread::spawn(move || {
+        crate::start_runtime(args, Some(rx));
+    });
+
+    // wait until app port is opened
+    tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
+}
+
+fn get_app_port() -> u16 {
     static PORT_COUNTER: AtomicU16 = AtomicU16::new(10000);
 
     let app_port = PORT_COUNTER.fetch_add(1, Ordering::SeqCst);
     // wrap around, if we ever have that many tests?
     if app_port >= 50000 {
         PORT_COUNTER.store(10000, Ordering::SeqCst);
     }
+    app_port
+}
+
+async fn setup_test_app_custom_docker() -> Result<TestInstance, Box<dyn std::error::Error>> {
+    let app_port = get_app_port();
 
     let container = GenericImage::new("postgres", "15.7")
         .with_wait_for(WaitFor::message_on_stderr(
@@ -98,30 +146,7 @@ pub async fn setup_test_app_custom_docker() -> Result<TestInstance, Box<dyn std:
     println!("DB prepared");
 
     let (app_close_channel, rx) = tokio::sync::watch::channel(false);
-    let args: Args = Args {
-        run_bg_worker: true,
-        run_server: true,
-        generate_fhe_keys: false,
-        server_maximum_ciphertexts_to_schedule: 5000,
-        work_items_batch_size: 40,
-        tenant_key_cache_size: 4,
-        coprocessor_fhe_threads: 4,
-        maximum_handles_per_input: 255,
-        tokio_threads: 2,
-        pg_pool_max_connections: 2,
-        server_addr: format!("127.0.0.1:{app_port}"),
-        database_url: Some(db_url.clone()),
-        maximimum_compact_inputs_upload: 10,
-        coprocessor_private_key: "./coprocessor.key".to_string(),
-    };
-
-    std::thread::spawn(move || {
-        crate::start_runtime(args, Some(rx));
-    });
-
-    // wait until app port is opened
-    tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
-
+    start_coprocessor(rx, app_port, &db_url).await;
     Ok(TestInstance {
         _container: Some(container),
         app_close_channel: Some(app_close_channel),
@@ -130,19 +155,19 @@ pub async fn setup_test_app_custom_docker() -> Result<TestInstance, Box<dyn std:
     })
 }
 
-pub async fn wait_until_all_ciphertexts_computed(test_instance: &TestInstance) -> Result<(), Box<dyn std::error::Error>> {
+pub async fn wait_until_all_ciphertexts_computed(
+    test_instance: &TestInstance,
+) -> Result<(), Box<dyn std::error::Error>> {
     let pool = sqlx::postgres::PgPoolOptions::new()
         .max_connections(2)
         .connect(test_instance.db_url())
         .await?;
 
     loop {
         tokio::time::sleep(tokio::time::Duration::from_secs(3)).await;
-        let count = sqlx::query!(
-            "SELECT count(*) FROM computations WHERE NOT is_completed"
-        )
-        .fetch_one(&pool)
-        .await?;
+        let count = sqlx::query!("SELECT count(*) FROM computations WHERE NOT is_completed")
+            .fetch_one(&pool)
+            .await?;
         let current_count = count.count.unwrap();
         if current_count == 0 {
             println!("All computations completed");
@@ -153,4 +178,4 @@ pub async fn wait_until_all_ciphertexts_computed(test_instance: &TestInstance) -
     }
 
     Ok(())
-}
+}