getTableNames to pass strings via malloc

Author: carlopi

lib/CMakeLists.txt

@@ -316,6 +316,7 @@ if(EMSCRIPTEN)
           _duckdb_web_get_feature_flags, \
           _duckdb_web_get_global_file_info, \
           _duckdb_web_get_tablenames, \
+          _duckdb_web_get_tablenames_buffer, \
           _duckdb_web_get_version, \
           _duckdb_web_insert_arrow_from_ipc_stream, \
           _duckdb_web_insert_csv_from_path, \

lib/src/webdb_api.cc

@@ -248,6 +248,13 @@ void duckdb_web_get_tablenames(WASMResponse* packed, ConnectionHdl connHdl, cons
     auto r = c->GetTableNames(query);
     WASMResponseBuffer::Get().Store(*packed, std::move(r));
 }
+/// Get table names
+void duckdb_web_get_tablenames_buffer(WASMResponse* packed, ConnectionHdl connHdl, const uint8_t* buffer, size_t buffer_length) {
+    auto c = reinterpret_cast<WebDB::Connection*>(connHdl);
+    std::string_view query(reinterpret_cast<const char*>(buffer), buffer_length);
+    auto r = c->GetTableNames(query);
+    WASMResponseBuffer::Get().Store(*packed, std::move(r));
+}
 /// Insert arrow from an ipc stream
 void duckdb_web_insert_arrow_from_ipc_stream(WASMResponse* packed, ConnectionHdl connHdl, const uint8_t* buffer,
                                              size_t buffer_length, const char* options) {

packages/duckdb-wasm/src/bindings/bindings_base.ts

@@ -233,7 +233,12 @@ export abstract class DuckDBBindingsBase implements DuckDBBindings {
     }
     /** Get table names */
     public getTableNames(conn: number, text: string): string[] {
-        const [s, d, n] = callSRet(this.mod, 'duckdb_web_get_tablenames', ['number', 'string'], [conn, text]);
+        const BUF = TEXT_ENCODER.encode(text);
+        const bufferPtr = this.mod._malloc(BUF.length);
+        const bufferOfs = this.mod.HEAPU8.subarray(bufferPtr, bufferPtr + BUF.length);
+        bufferOfs.set(BUF);
+        const [s, d, n] = callSRet(this.mod, 'duckdb_web_get_tablenames_buffer', ['number', 'number', 'number'], [conn, bufferPtr, BUF.length]);
+        this.mod._free(bufferPtr);
         if (s !== StatusCode.SUCCESS) {
             throw new Error(readString(this.mod, d, n));
         }