feat(snapshot): replace ServerFamily::Load error with GenericError

src/server/server_family.cc

@@ -507,12 +507,12 @@ struct AggregateLoadResult {
 // Load starts as many fibers as there are files to load each one separately.
 // It starts one more fiber that waits for all load fibers to finish and returns the first
 // error (if any occured) with a future.
-Future<std::error_code> ServerFamily::Load(const std::string& load_path) {
+Future<GenericError> ServerFamily::Load(const std::string& load_path) {
   auto paths_result = snapshot_storage_->LoadPaths(load_path);
   if (!paths_result) {
     LOG(ERROR) << "Failed to load snapshot: " << paths_result.error().Format();
 
-    Promise<std::error_code> ec_promise;
+    Promise<GenericError> ec_promise;
     ec_promise.set_value(paths_result.error());
     return ec_promise.get_future();
   }
@@ -554,8 +554,8 @@ Future<std::error_code> ServerFamily::Load(const std::string& load_path) {
     load_fibers.push_back(proactor->LaunchFiber(std::move(load_fiber)));
   }
 
-  Promise<std::error_code> ec_promise;
-  Future<std::error_code> ec_future = ec_promise.get_future();
+  Promise<GenericError> ec_promise;
+  Future<GenericError> ec_future = ec_promise.get_future();
 
   // Run fiber that empties the channel and sets ec_promise.
   auto load_join_fiber = [this, aggregated_result, load_fibers = std::move(load_fibers),

src/server/server_family.h

@@ -133,7 +133,7 @@ class ServerFamily {
 
   // Load snapshot from file (.rdb file or summary.dfs file) and return
   // future with error_code.
-  Future<std::error_code> Load(const std::string& file_name);
+  Future<GenericError> Load(const std::string& file_name);
 
   // used within tests.
   bool IsSaving() const {
@@ -218,7 +218,7 @@ class ServerFamily {
   void SnapshotScheduling();
 
   Fiber snapshot_schedule_fb_;
-  Future<std::error_code> load_result_;
+  Future<GenericError> load_result_;
 
   uint32_t stats_caching_task_ = 0;
   Service& service_;