feat: add get_session endpoint in code interpreter API

server/src/main/java/com/epam/aidial/core/server/controller/CodeInterpreterController.java

@@ -65,6 +65,19 @@ Future<?> closeSession() {
         return Future.succeededFuture();
     }
 
+    Future<?> getSession() {
+        context.getRequest()
+                .body()
+                .compose(body -> {
+                    CodeInterpreterSessionId data = convertJson(body, CodeInterpreterSessionId.class);
+                    return vertx.executeBlocking(() -> service.getSession(context, data.getSessionId()), false);
+                })
+                .onSuccess(this::respondJson)
+                .onFailure(this::respondError);
+
+        return Future.succeededFuture();
+    }
+
     Future<?> executeCode() {
         context.getRequest()
                 .body()

server/src/main/java/com/epam/aidial/core/server/controller/ControllerSelector.java

@@ -76,9 +76,10 @@ public class ControllerSelector {
 
     private static final Pattern APP_SCHEMAS = Pattern.compile("^/v1/application_type_schemas/(schemas|schema|meta_schema)?");
     private static final Pattern CODE_INTERPRETER = Pattern.compile("^/v1/ops/code_interpreter/"
-                                                                    + "(open_session|close_session|execute_code|"
-                                                                    + "upload_file|download_file|list_files|"
-                                                                    + "transfer_input_file|transfer_output_file)$");
+            + "(open_session|close_session|get_session|"
+            + "execute_code|"
+            + "upload_file|download_file|list_files|"
+            + "transfer_input_file|transfer_output_file)$");
 
     static {
         // GET routes
@@ -294,6 +295,7 @@ public class ControllerSelector {
             return switch (operation) {
                 case "open_session" -> controller::openSession;
                 case "close_session" -> controller::closeSession;
+                case "get_session" -> controller::getSession;
                 case "execute_code" -> controller::executeCode;
                 case "upload_file" -> controller::uploadFile;
                 case "download_file" -> controller::downloadFile;

server/src/main/java/com/epam/aidial/core/server/service/codeinterpreter/CodeInterpreterService.java

@@ -123,6 +123,21 @@ private void cleanupSession(ResourceDescriptor resource, Predicate<CodeInterpret
         }
     }
 
+    public CodeInterpreterSession getSession(ProxyContext context, String sessionId) {
+        verifyActive();
+        verifySessionId(sessionId);
+
+        ResourceDescriptor resource = sessionResource(context, sessionId);
+        String json = resourceService.getResource(resource);
+        CodeInterpreterSession session = convertToObject(json, CodeInterpreterSession.class);
+
+        if (session == null) {
+            throw new ResourceNotFoundException("Session is not found: " + sessionId);
+        }
+
+        return session;
+    }
+
     public CodeInterpreterSession touchSession(ProxyContext context, String sessionId) {
         verifyActive();
         verifySessionId(sessionId);

server/src/test/java/com/epam/aidial/core/server/CodeInterpreterApiTest.java

@@ -30,6 +30,10 @@ void testStatefulWorkflow() {
                 {}""");
         verifyJson(response, 200, """
                 {"sessionId":"0123"}""");
+        response = send(HttpMethod.POST, "/v1/ops/code_interpreter/get_session", null, """
+                {"sessionId":"0123"}""");
+        verifyJson(response, 200, """
+                {"sessionId":"0123"}""");
 
         webServer.map(HttpMethod.POST, "/execute_code", 200, """
                 {"status":"SUCCESS","stdout":"","stderr":"","result":{"text/plain":"3"},"display":[]}""");
@@ -91,6 +95,9 @@ void testStatefulWorkflow() {
                 {"sessionId":"0123"}""");
         verifyJson(response, 200, """
                 {"sessionId":"0123"}""");
+        response = send(HttpMethod.POST, "/v1/ops/code_interpreter/get_session", null, """
+                {"sessionId":"0123"}""");
+        verify(response, 404, "Session is not found: 0123");
     }
 
     @Test