Try another server if we get an error when executing an RPC, possibly fixes #119

src/connection.cpp

@@ -10,6 +10,7 @@
 #include "../lib/silentdragonlitelib.h"
 #include "precompiled.h"
 #include <QThreadPool>
+#include "sdl.h"
 
 using json = nlohmann::json;
 
@@ -357,15 +358,39 @@ QString litelib_process_response(char* resp)
  ************************************************************************************/
 void Executor::run()
 {
-    char* resp = litelib_execute(this->cmd.toStdString().c_str(), this->args.toStdString().c_str());
-    QString reply = litelib_process_response(resp);
+    auto config = std::shared_ptr<ConnectionConfig>(new ConnectionConfig());
+    DEBUG("cmd=" << cmd << " args=" << args << " server=" << config->server);
+    QString response = "";
+    try {
+        char* resp = litelib_execute(this->cmd.toStdString().c_str(), this->args.toStdString().c_str());
+        response = litelib_process_response(resp);
+    } catch (const std::exception& e)  {
+        DEBUG("ignoring exception: " << e.what() );
+    }
+
+    if (response.toUpper().trimmed() != "OK") {
+        config->server = Settings::getRandomServer();
+
+        try {
+            char* resp = litelib_initialize_existing(
+                config->dangerous,
+                config->server.toStdString().c_str()
+            );
+            response = litelib_process_response(resp);
+            resp = litelib_execute(this->cmd.toStdString().c_str(), this->args.toStdString().c_str());
+            response = litelib_process_response(resp);
+        } catch (const std::exception& e)  {
+            DEBUG("server= " << config->server << " gave exception: " << e.what() );
+            emit handleError(response);
+        }
+    }
     auto parsed = json::parse(
-        reply.toStdString().c_str(),
+        response.toStdString().c_str(),
         nullptr,
         false
     );
     if (parsed.is_discarded() || parsed.is_null()) {
-        emit handleError(reply);
+        emit handleError(response);
     } else {
         emit responseReady(parsed);
     }