crypto: Allow duplicating a Client in tests

testing/matrix-sdk-integration-testing/src/helpers.rs

@@ -2,6 +2,7 @@ use std::{
     collections::HashMap,
     ops::Deref,
     option_env,
+    path::{Path, PathBuf},
     sync::{Arc, Mutex as StdMutex},
     time::Duration,
 };
@@ -21,9 +22,14 @@ use tokio::sync::Mutex;
 
 static USERS: Lazy<Mutex<HashMap<String, (Client, TempDir)>>> = Lazy::new(Mutex::default);
 
+enum SqlitePath {
+    Random,
+    Path(PathBuf),
+}
+
 pub struct TestClientBuilder {
     username: String,
-    use_sqlite: bool,
+    use_sqlite_dir: Option<SqlitePath>,
     encryption_settings: EncryptionSettings,
     http_proxy: Option<String>,
 }
@@ -32,7 +38,7 @@ impl TestClientBuilder {
     pub fn new(username: impl Into<String>) -> Self {
         Self {
             username: username.into(),
-            use_sqlite: false,
+            use_sqlite_dir: None,
             encryption_settings: Default::default(),
             http_proxy: None,
         }
@@ -45,7 +51,16 @@ impl TestClientBuilder {
     }
 
     pub fn use_sqlite(mut self) -> Self {
-        self.use_sqlite = true;
+        self.use_sqlite_dir = Some(SqlitePath::Random);
+        self
+    }
+
+    /// Create or re-use a Sqlite store (with no passphrase) in the supplied
+    /// directory. Note: this path must remain valid throughout the use of
+    /// the constructed Client, so if you created a TempDir you must hang on
+    /// to a reference to it throughout the test.
+    pub fn use_sqlite_dir(mut self, path: &Path) -> Self {
+        self.use_sqlite_dir = Some(SqlitePath::Path(path.to_owned()));
         self
     }
 
@@ -59,6 +74,44 @@ impl TestClientBuilder {
         self
     }
 
+    /// Create a new Client that is a copy of the supplied one, created using
+    /// [`Client::restore_session`].
+    pub async fn duplicate(self, other: &Client) -> Result<Client> {
+        let homeserver_url =
+            option_env!("HOMESERVER_URL").unwrap_or("http://localhost:8228").to_owned();
+        let sliding_sync_proxy_url =
+            option_env!("SLIDING_SYNC_PROXY_URL").unwrap_or("http://localhost:8338").to_owned();
+
+        let mut client_builder = Client::builder()
+            .user_agent("matrix-sdk-integration-tests")
+            .homeserver_url(homeserver_url)
+            .sliding_sync_proxy(sliding_sync_proxy_url)
+            .with_encryption_settings(self.encryption_settings)
+            .request_config(RequestConfig::short_retry());
+
+        if let Some(proxy) = self.http_proxy {
+            client_builder = client_builder.proxy(proxy);
+        }
+
+        let client = match self.use_sqlite_dir {
+            Some(SqlitePath::Path(path_buf)) => {
+                client_builder.sqlite_store(&path_buf, None).build().await?
+            }
+            _ => {
+                panic!("You must call use_sqlite_dir for a duplicate client!");
+            }
+        };
+
+        client
+            .restore_session(
+                other.session().expect("Session must be logged in before we can duplicate it"),
+            )
+            .await
+            .expect("Failed to restore session");
+
+        Ok(client)
+    }
+
     pub async fn build(self) -> Result<Client> {
         let mut users = USERS.lock().await;
         if let Some((client, _)) = users.get(&self.username) {
@@ -83,10 +136,14 @@ impl TestClientBuilder {
             client_builder = client_builder.proxy(proxy);
         }
 
-        let client = if self.use_sqlite {
-            client_builder.sqlite_store(tmp_dir.path(), None).build().await?
-        } else {
-            client_builder.build().await?
+        let client = match self.use_sqlite_dir {
+            None => client_builder.build().await?,
+            Some(SqlitePath::Random) => {
+                client_builder.sqlite_store(tmp_dir.path(), None).build().await?
+            }
+            Some(SqlitePath::Path(path_buf)) => {
+                client_builder.sqlite_store(&path_buf, None).build().await?
+            }
         };
 
         // safe to assume we have not registered this user yet, but ignore if we did