fix: expore stop_indexer for outside-restarts

src/lez_indexer_module_impl.cpp

@@ -21,12 +21,8 @@ namespace {
 } // namespace
 
 LezIndexerModuleImpl::~LezIndexerModuleImpl() {
-    if (indexer_service_ffi) {
-        OperationStatus operation_result = stop_indexer(handle(indexer_service_ffi));
-        if (is_error(&operation_result)) {
-            warn("destructor", "indexer FFI error on stop");
-        }
-        indexer_service_ffi = nullptr;
+    if (stop_indexer() != 0) {
+        warn("destructor", "indexer FFI error on stop");
     }
 }
 
@@ -50,6 +46,21 @@ int64_t LezIndexerModuleImpl::start_indexer(const std::string& config_path) {
     return 0;
 }
 
+int64_t LezIndexerModuleImpl::stop_indexer() {
+    if (!indexer_service_ffi) {
+        return 0; // not running
+    }
+    // stop_indexer frees the handle; null ours before returning so a later start
+    // (or the destructor) doesn't double-free or operate on a dead pointer.
+    OperationStatus operation_result = ::stop_indexer(handle(indexer_service_ffi));
+    indexer_service_ffi = nullptr;
+    if (is_error(&operation_result)) {
+        warn("stop_indexer", "indexer FFI error on stop");
+        return static_cast<int64_t>(operation_result);
+    }
+    return 0;
+}
+
 void LezIndexerModuleImpl::init_logger(const std::string& level) {
     ::init_logger(level.c_str());
 }

src/lez_indexer_module_impl.h

@@ -35,6 +35,12 @@ public:
     /// as scalar wire types; a plain `int` return is treated as a JSON payload.
     int64_t start_indexer(const std::string& config_path);
 
+    /// Stop ingestion and release the FFI handle. No-op (returns 0) when the
+    /// indexer isn't running. Pair with start_indexer to apply a new config:
+    /// stop, then start (start_indexer stays idempotent and won't restart on its
+    /// own). Returns 0 on success, else the FFI OperationStatus code.
+    int64_t stop_indexer();
+
     /// Account by 32-byte hex id. The returned JSON omits the id; callers inject
     /// the queried id themselves.
     std::string getAccount(const std::string& account_id);