Cover traced ticket reattach recovery

tests/integration_smoke.rs

@@ -152,21 +152,41 @@ fn write_server_config_with_retransmit_window(
 }
 
 fn start_server(dir: &tempfile::TempDir, config: &std::path::Path) -> Child {
+    start_server_with_trace(dir, config, None)
+}
+
+fn start_server_with_trace(
+    dir: &tempfile::TempDir,
+    config: &std::path::Path,
+    trace: Option<&Path>,
+) -> Child {
     let server = env!("CARGO_BIN_EXE_dosh-server");
-    let child = Command::new(server)
+    let mut command = Command::new(server);
+    command
         .arg("serve")
         .arg("--config")
         .arg(config)
         .env("HOME", dir.path())
         .stdout(Stdio::null())
-        .stderr(Stdio::null())
-        .spawn()
-        .unwrap();
+        .stderr(Stdio::null());
+    if let Some(trace) = trace {
+        command.env("DOSH_TRACE", trace);
+    }
+    let child = command.spawn().unwrap();
     thread::sleep(Duration::from_millis(500));
     child
 }
 
 fn attach_once(dir: &tempfile::TempDir, port: u16, cache: bool) -> std::process::Output {
+    attach_once_with_trace(dir, port, cache, None)
+}
+
+fn attach_once_with_trace(
+    dir: &tempfile::TempDir,
+    port: u16,
+    cache: bool,
+    trace: Option<&Path>,
+) -> std::process::Output {
     let client = env!("CARGO_BIN_EXE_dosh-client");
     let mut cmd = Command::new(client);
     cmd.arg("--local-auth")
@@ -181,6 +201,9 @@ fn attach_once(dir: &tempfile::TempDir, port: u16, cache: bool) -> std::process:
     if !cache {
         cmd.arg("--no-cache");
     }
+    if let Some(trace) = trace {
+        cmd.env("DOSH_TRACE", trace);
+    }
     cmd.output().unwrap()
 }
 
@@ -1564,7 +1587,9 @@ fn ticket_attach_after_server_restart_smoke() {
     let dir = tempfile::tempdir().unwrap();
     let port = free_udp_port();
     let config = write_server_config(&dir, port);
-    let mut server = start_server(&dir, &config);
+    let server_trace = dir.path().join("server-trace.log");
+    let client_trace = dir.path().join("client-trace.log");
+    let mut server = start_server_with_trace(&dir, &config, Some(&server_trace));
     let first = attach_once(&dir, port, true);
     let _ = server.kill();
     let _ = server.wait();
@@ -1574,8 +1599,8 @@ fn ticket_attach_after_server_restart_smoke() {
         String::from_utf8_lossy(&first.stderr)
     );
 
-    let mut server = start_server(&dir, &config);
-    let second = attach_once(&dir, port, true);
+    let mut server = start_server_with_trace(&dir, &config, Some(&server_trace));
+    let second = attach_once_with_trace(&dir, port, true, Some(&client_trace));
     let _ = server.kill();
     let _ = server.wait();
     let stderr = String::from_utf8_lossy(&second.stderr);
@@ -1584,6 +1609,24 @@ fn ticket_attach_after_server_restart_smoke() {
         stderr.contains("udp_ticket_attach_ready"),
         "stderr={stderr}"
     );
+    let server_trace = fs::read_to_string(&server_trace).unwrap();
+    let client_trace = fs::read_to_string(&client_trace).unwrap();
+    assert!(
+        server_trace.contains("event=server.ticket_attach_start"),
+        "server trace={server_trace}"
+    );
+    assert!(
+        server_trace.contains("event=server.ticket_attach_ok"),
+        "server trace={server_trace}"
+    );
+    assert!(
+        client_trace.contains("event=client.ticket_attach_start"),
+        "client trace={client_trace}"
+    );
+    assert!(
+        client_trace.contains("event=client.ticket_attach_ok"),
+        "client trace={client_trace}"
+    );
 }
 
 #[test]