Move Lua scripting engine into a Valkey module

README.md

@@ -52,13 +52,17 @@ as libsystemd-dev on Debian/Ubuntu or systemd-devel on CentOS) and run:
 
     % make USE_SYSTEMD=yes
 
-Since Valkey version 8.1, `fast_float` has been introduced as an optional 
-dependency, which can speed up sorted sets and other commands that use 
-the double datatype. To build with `fast_float` support, you'll need a 
+Since Valkey version 8.1, `fast_float` has been introduced as an optional
+dependency, which can speed up sorted sets and other commands that use
+the double datatype. To build with `fast_float` support, you'll need a
 C++ compiler and run:
 
     % make USE_FAST_FLOAT=yes
 
+To build Valkey without the Lua engine:
+
+    % make BUILD_LUA=no
+
 To append a suffix to Valkey program names, use:
 
     % make PROG_SUFFIX="-alt"

cmake/Modules/SourceFiles.cmake

@@ -100,13 +100,9 @@ set(VALKEY_SERVER_SRCS
     ${CMAKE_SOURCE_DIR}/src/mt19937-64.c
     ${CMAKE_SOURCE_DIR}/src/resp_parser.c
     ${CMAKE_SOURCE_DIR}/src/call_reply.c
-    ${CMAKE_SOURCE_DIR}/src/lua/script_lua.c
     ${CMAKE_SOURCE_DIR}/src/script.c
     ${CMAKE_SOURCE_DIR}/src/functions.c
     ${CMAKE_SOURCE_DIR}/src/scripting_engine.c
-    ${CMAKE_SOURCE_DIR}/src/lua/function_lua.c
-    ${CMAKE_SOURCE_DIR}/src/lua/engine_lua.c
-    ${CMAKE_SOURCE_DIR}/src/lua/debug_lua.c
     ${CMAKE_SOURCE_DIR}/src/trace/trace.c
     ${CMAKE_SOURCE_DIR}/src/trace/trace_rdb.c
     ${CMAKE_SOURCE_DIR}/src/trace/trace_aof.c

cmake/Modules/ValkeySetup.cmake

@@ -278,8 +278,8 @@ if (BUILD_SANITIZER)
 endif ()
 
 include_directories("${CMAKE_SOURCE_DIR}/deps/libvalkey/include")
+include_directories("${CMAKE_SOURCE_DIR}/src/modules/lua")
 include_directories("${CMAKE_SOURCE_DIR}/deps/linenoise")
-include_directories("${CMAKE_SOURCE_DIR}/deps/lua/src")
 include_directories("${CMAKE_SOURCE_DIR}/deps/hdr_histogram")
 include_directories("${CMAKE_SOURCE_DIR}/deps/fpconv")
 

deps/Makefile

@@ -76,7 +76,7 @@ hdr_histogram: .make-prerequisites
 
 fpconv: .make-prerequisites
 	@printf '%b %b\n' $(MAKECOLOR)MAKE$(ENDCOLOR) $(BINCOLOR)$@$(ENDCOLOR)
-	cd fpconv && $(MAKE)
+	cd fpconv && $(MAKE) CFLAGS="-fPIC $(CFLAGS)"
 
 .PHONY: fpconv
 
@@ -85,12 +85,12 @@ ifeq ($(uname_S),SunOS)
 	LUA_CFLAGS= -D__C99FEATURES__=1
 endif
 
-LUA_CFLAGS+= -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DLUA_USE_MKSTEMP $(CFLAGS)
+LUA_CFLAGS+= -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DLUA_USE_MKSTEMP $(CFLAGS) -fPIC
 LUA_LDFLAGS+= $(LDFLAGS)
 ifeq ($(LUA_DEBUG),yes)
 	LUA_CFLAGS+= -O0 -g -DLUA_USE_APICHECK
 else
-	LUA_CFLAGS+= -O2 
+	LUA_CFLAGS+= -O2
 endif
 ifeq ($(LUA_COVERAGE),yes)
 	LUA_CFLAGS += -fprofile-arcs -ftest-coverage

deps/lua/CMakeLists.txt

@@ -44,6 +44,7 @@ set(LUA_SRCS
 add_library(lualib STATIC "${LUA_SRCS}")
 target_include_directories(lualib PUBLIC "${LUA_SRC_DIR}")
 target_compile_definitions(lualib PRIVATE ENABLE_CJSON_GLOBAL)
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
 
 # Use mkstemp if available
 check_function_exists(mkstemp HAVE_MKSTEMP)

src/CMakeLists.txt

@@ -9,14 +9,30 @@ message(STATUS "CFLAGS: ${CMAKE_C_FLAGS}")
 
 get_valkey_server_linker_option(VALKEY_SERVER_LDFLAGS)
 list(APPEND SERVER_LIBS "fpconv")
-list(APPEND SERVER_LIBS "lualib")
 list(APPEND SERVER_LIBS "hdr_histogram")
 valkey_build_and_install_bin(valkey-server "${VALKEY_SERVER_SRCS}" "${VALKEY_SERVER_LDFLAGS}" "${SERVER_LIBS}"
                              "redis-server")
 add_dependencies(valkey-server generate_commands_def)
 add_dependencies(valkey-server generate_fmtargs_h)
 add_dependencies(valkey-server release_header)
 
+if (NOT WITHOUT_LUA)
+    message(STATUS "Build Lua scripting engine module")
+    add_subdirectory(modules/lua)
+    add_dependencies(valkey-server valkeylua)
+    target_compile_definitions(valkey-server PRIVATE LUA_ENGINE_ENABLED)
+    target_compile_definitions(valkey-server PRIVATE LUA_ENGINE_LIB=libvalkeylua.so)
+    target_link_options(valkey-server PRIVATE -Wl,--disable-new-dtags)
+
+    set(VALKEY_INSTALL_RPATH "")
+    set_target_properties(valkey-server PROPERTIES
+        INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR};${CMAKE_LIBRARY_OUTPUT_DIRECTORY}"
+        INSTALL_RPATH_USE_LINK_PATH TRUE
+        BUILD_WITH_INSTALL_RPATH TRUE
+    )
+endif()
+unset(WITHOUT_LUA CACHE)
+
 if (VALKEY_RELEASE_BUILD)
     # Enable LTO for Release build
     set_property(TARGET valkey-server PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)

src/Makefile

@@ -31,7 +31,7 @@ endif
 ifneq ($(OPTIMIZATION),-O0)
 	OPTIMIZATION+=-fno-omit-frame-pointer
 endif
-DEPENDENCY_TARGETS=libvalkey linenoise lua hdr_histogram fpconv
+DEPENDENCY_TARGETS=libvalkey linenoise hdr_histogram fpconv
 NODEPS:=clean distclean
 
 # Default settings
@@ -63,6 +63,7 @@ endif
 
 PREFIX?=/usr/local
 INSTALL_BIN=$(PREFIX)/bin
+INSTALL_LIB=$(PREFIX)/lib
 INSTALL=install
 PKG_CONFIG?=pkg-config
 
@@ -250,7 +251,25 @@ ifdef OPENSSL_PREFIX
 endif
 
 # Include paths to dependencies
-FINAL_CFLAGS+= -I../deps/libvalkey/include -I../deps/linenoise -I../deps/lua/src -I../deps/hdr_histogram -I../deps/fpconv
+FINAL_CFLAGS+= -I../deps/libvalkey/include -I../deps/linenoise -I../deps/hdr_histogram -I../deps/fpconv
+
+# Lua scripting engine module
+LUA_MODULE_NAME:=modules/lua/libvalkeylua.so
+ifeq ($(BUILD_LUA),no)
+	LUA_MODULE=
+	LUA_MODULE_INSTALL=
+else
+	LUA_MODULE=$(LUA_MODULE_NAME)
+	LUA_MODULE_INSTALL=install-lua-module
+
+	current_dir = $(shell pwd)
+	FINAL_CFLAGS+=-DLUA_ENGINE_ENABLED -DLUA_ENGINE_LIB=libvalkeylua.so
+ifeq ($(uname_S),Darwin)
+	FINAL_LDFLAGS+= -Wl,-rpath,$(PREFIX)/lib:$(current_dir)/modules/lua
+else
+	FINAL_LDFLAGS+= -Wl,-rpath,$(PREFIX)/lib:$(current_dir)/modules/lua -Wl,--disable-new-dtags
+endif
+endif
 
 # Determine systemd support and/or build preference (defaulting to auto-detection)
 BUILD_WITH_SYSTEMD=no
@@ -423,7 +442,7 @@ ENGINE_NAME=valkey
 SERVER_NAME=$(ENGINE_NAME)-server$(PROG_SUFFIX)
 ENGINE_SENTINEL_NAME=$(ENGINE_NAME)-sentinel$(PROG_SUFFIX)
 ENGINE_TRACE_OBJ=trace/trace.o trace/trace_commands.o trace/trace_db.o trace/trace_cluster.o trace/trace_server.o trace/trace_rdb.o trace/trace_aof.o
-ENGINE_SERVER_OBJ=threads_mngr.o adlist.o vector.o quicklist.o ae.o anet.o dict.o hashtable.o kvstore.o server.o sds.o zmalloc.o lzf_c.o lzf_d.o pqsort.o zipmap.o sha1.o ziplist.o release.o memory_prefetch.o io_threads.o networking.o util.o object.o db.o replication.o rdb.o t_string.o t_list.o t_set.o t_zset.o t_hash.o config.o aof.o pubsub.o multi.o debug.o sort.o intset.o syncio.o cluster.o cluster_legacy.o cluster_slot_stats.o crc16.o cluster_migrateslots.o endianconv.o commandlog.o eval.o bio.o rio.o rand.o memtest.o syscheck.o crcspeed.o crccombine.o crc64.o bitops.o sentinel.o notify.o setproctitle.o blocked.o hyperloglog.o latency.o sparkline.o valkey-check-rdb.o valkey-check-aof.o geo.o lazyfree.o module.o evict.o expire.o geohash.o geohash_helper.o childinfo.o allocator_defrag.o defrag.o siphash.o rax.o t_stream.o listpack.o localtime.o lolwut.o lolwut5.o lolwut6.o lolwut9.o acl.o tracking.o socket.o tls.o sha256.o timeout.o setcpuaffinity.o monotonic.o mt19937-64.o resp_parser.o call_reply.o script.o functions.o commands.o strl.o connection.o unix.o logreqres.o rdma.o scripting_engine.o entry.o vset.o lua/script_lua.o lua/function_lua.o lua/engine_lua.o lua/debug_lua.o
+ENGINE_SERVER_OBJ=threads_mngr.o adlist.o vector.o quicklist.o ae.o anet.o dict.o hashtable.o kvstore.o server.o sds.o zmalloc.o lzf_c.o lzf_d.o pqsort.o zipmap.o sha1.o ziplist.o release.o memory_prefetch.o io_threads.o networking.o util.o object.o db.o replication.o rdb.o t_string.o t_list.o t_set.o t_zset.o t_hash.o config.o aof.o pubsub.o multi.o debug.o sort.o intset.o syncio.o cluster.o cluster_legacy.o cluster_slot_stats.o crc16.o cluster_migrateslots.o endianconv.o commandlog.o eval.o bio.o rio.o rand.o memtest.o syscheck.o crcspeed.o crccombine.o crc64.o bitops.o sentinel.o notify.o setproctitle.o blocked.o hyperloglog.o latency.o sparkline.o valkey-check-rdb.o valkey-check-aof.o geo.o lazyfree.o module.o evict.o expire.o geohash.o geohash_helper.o childinfo.o allocator_defrag.o defrag.o siphash.o rax.o t_stream.o listpack.o localtime.o lolwut.o lolwut5.o lolwut6.o lolwut9.o acl.o tracking.o socket.o tls.o sha256.o timeout.o setcpuaffinity.o monotonic.o mt19937-64.o resp_parser.o call_reply.o script.o functions.o commands.o strl.o connection.o unix.o logreqres.o rdma.o scripting_engine.o entry.o vset.o
 ENGINE_SERVER_OBJ+=$(ENGINE_TRACE_OBJ)
 ENGINE_CLI_NAME=$(ENGINE_NAME)-cli$(PROG_SUFFIX)
 ENGINE_CLI_OBJ=anet.o adlist.o dict.o valkey-cli.o zmalloc.o release.o ae.o serverassert.o crcspeed.o crccombine.o crc64.o siphash.o crc16.o monotonic.o cli_common.o mt19937-64.o strl.o cli_commands.o sds.o util.o sha256.o
@@ -448,7 +467,7 @@ ifeq ($(USE_FAST_FLOAT),yes)
 	FINAL_LIBS += $(FAST_FLOAT_STRTOD_OBJECT)
 endif
 
-all: $(SERVER_NAME) $(ENGINE_SENTINEL_NAME) $(ENGINE_CLI_NAME) $(ENGINE_BENCHMARK_NAME) $(ENGINE_CHECK_RDB_NAME) $(ENGINE_CHECK_AOF_NAME) $(TLS_MODULE) $(RDMA_MODULE)
+all: $(SERVER_NAME) $(ENGINE_SENTINEL_NAME) $(ENGINE_CLI_NAME) $(ENGINE_BENCHMARK_NAME) $(ENGINE_CHECK_RDB_NAME) $(ENGINE_CHECK_AOF_NAME) $(TLS_MODULE) $(RDMA_MODULE) $(LUA_MODULE)
 	@echo ""
 	@echo "Hint: It's a good idea to run 'make test' ;)"
 	@echo ""
@@ -473,6 +492,7 @@ persist-settings: distclean
 	echo BUILD_TLS=$(BUILD_TLS) >> .make-settings
 	echo BUILD_RDMA=$(BUILD_RDMA) >> .make-settings
 	echo USE_SYSTEMD=$(USE_SYSTEMD) >> .make-settings
+	echo BUILD_LUA=$(BUILD_LUA) >> .make-settings
 	echo CFLAGS=$(CFLAGS) >> .make-settings
 	echo LDFLAGS=$(LDFLAGS) >> .make-settings
 	echo SERVER_CFLAGS=$(SERVER_CFLAGS) >> .make-settings
@@ -498,15 +518,15 @@ endif
 
 # valkey-server
 $(SERVER_NAME): $(ENGINE_SERVER_OBJ)
-	$(SERVER_LD) -o $@ $^ ../deps/libvalkey/lib/libvalkey.a ../deps/lua/src/liblua.a ../deps/hdr_histogram/libhdrhistogram.a ../deps/fpconv/libfpconv.a $(FINAL_LIBS)
+	$(SERVER_LD) -o $@ $^ ../deps/libvalkey/lib/libvalkey.a ../deps/hdr_histogram/libhdrhistogram.a ../deps/fpconv/libfpconv.a $(FINAL_LIBS)
 
 # Valkey static library, used to compile against for unit testing
 $(ENGINE_LIB_NAME): $(ENGINE_SERVER_OBJ)
 	$(SERVER_AR) rcs $@ $^
 
 # valkey-unit-tests
 $(ENGINE_UNIT_TESTS): $(ENGINE_TEST_OBJ) $(ENGINE_LIB_NAME)
-	$(SERVER_LD) -o $@ $^ ../deps/libvalkey/lib/libvalkey.a ../deps/lua/src/liblua.a ../deps/hdr_histogram/libhdrhistogram.a ../deps/fpconv/libfpconv.a $(FINAL_LIBS)
+	$(SERVER_LD) -o $@ $^ ../deps/libvalkey/lib/libvalkey.a ../deps/hdr_histogram/libhdrhistogram.a ../deps/fpconv/libfpconv.a $(FINAL_LIBS)
 
 # valkey-sentinel
 $(ENGINE_SENTINEL_NAME): $(SERVER_NAME)
@@ -528,6 +548,10 @@ $(TLS_MODULE_NAME): $(SERVER_NAME)
 $(RDMA_MODULE_NAME): $(SERVER_NAME)
 	$(QUIET_CC)$(CC) -o $@ rdma.c -shared -fPIC $(RDMA_MODULE_CFLAGS)
 
+# engine_lua.so
+$(LUA_MODULE_NAME): $(SERVER_NAME)
+	cd modules/lua && $(MAKE) OPTIMIZATION="$(OPTIMIZATION)"
+
 # valkey-cli
 $(ENGINE_CLI_NAME): $(ENGINE_CLI_OBJ)
 	$(SERVER_LD) -o $@ $^ ../deps/libvalkey/lib/libvalkey.a ../deps/linenoise/linenoise.o ../deps/fpconv/libfpconv.a $(FINAL_LIBS) $(TLS_CLIENT_LIBS) $(RDMA_CLIENT_LIBS)
@@ -545,9 +569,6 @@ DEP = $(ENGINE_SERVER_OBJ:%.o=%.d) $(ENGINE_CLI_OBJ:%.o=%.d) $(ENGINE_BENCHMARK_
 %.o: %.c .make-prerequisites
 	$(SERVER_CC) -MMD -o $@ -c $<
 
-lua/%.o: lua/%.c .make-prerequisites
-	$(SERVER_CC) -MMD -o $@ -c $<
-
 trace/%.o: trace/%.c .make-prerequisites
 	$(SERVER_CC) -Itrace -MMD -o $@ -c $<
 
@@ -574,8 +595,9 @@ endif
 commands.c: $(COMMANDS_DEF_FILENAME).def
 
 clean:
-	rm -rf $(SERVER_NAME) $(ENGINE_SENTINEL_NAME) $(ENGINE_CLI_NAME) $(ENGINE_BENCHMARK_NAME) $(ENGINE_CHECK_RDB_NAME) $(ENGINE_CHECK_AOF_NAME) $(ENGINE_UNIT_TESTS) $(ENGINE_LIB_NAME) unit/*.o unit/*.d lua/*.o lua/*.d trace/*.o trace/*.d *.o *.gcda *.gcno *.gcov valkey.info lcov-html Makefile.dep *.so
+	rm -rf $(SERVER_NAME) $(ENGINE_SENTINEL_NAME) $(ENGINE_CLI_NAME) $(ENGINE_BENCHMARK_NAME) $(ENGINE_CHECK_RDB_NAME) $(ENGINE_CHECK_AOF_NAME) $(ENGINE_UNIT_TESTS) $(ENGINE_LIB_NAME) unit/*.o unit/*.d trace/*.o trace/*.d *.o *.gcda *.gcno *.gcov valkey.info lcov-html Makefile.dep *.so
 	rm -f $(DEP)
+	-(cd modules/lua && $(MAKE) clean)
 
 .PHONY: clean
 
@@ -634,7 +656,7 @@ valgrind:
 helgrind:
 	$(MAKE) OPTIMIZATION="-O0" MALLOC="libc" CFLAGS="-D__ATOMIC_VAR_FORCE_SYNC_MACROS" SERVER_CFLAGS="-I/usr/local/include" SERVER_LDFLAGS="-L/usr/local/lib"
 
-install: all
+install: all $(LUA_MODULE_INSTALL)
 	@mkdir -p $(INSTALL_BIN)
 	$(call MAKE_INSTALL,$(SERVER_NAME),$(INSTALL_BIN))
 	$(call MAKE_INSTALL,$(ENGINE_BENCHMARK_NAME),$(INSTALL_BIN))
@@ -649,6 +671,10 @@ install: all
 	$(call MAYBE_INSTALL_REDIS_SYMLINK,$(ENGINE_CHECK_AOF_NAME),$(INSTALL_BIN))
 	$(call MAYBE_INSTALL_REDIS_SYMLINK,$(ENGINE_SENTINEL_NAME),$(INSTALL_BIN))
 
+install-lua-module: $(LUA_MODULE)
+	@mkdir -p $(INSTALL_LIB)
+	$(call MAKE_INSTALL,$(LUA_MODULE),$(INSTALL_LIB))
+
 uninstall:
 	@rm -f $(INSTALL_BIN)/{$(SERVER_NAME),$(ENGINE_BENCHMARK_NAME),$(ENGINE_CLI_NAME),$(ENGINE_CHECK_RDB_NAME),$(ENGINE_CHECK_AOF_NAME),$(ENGINE_SENTINEL_NAME)}
 	$(call MAYBE_UNINSTALL_REDIS_SYMLINK,$(INSTALL_BIN),$(SERVER_NAME))

src/config.c

@@ -29,6 +29,7 @@
  */
 
 #include "io_threads.h"
+#include "sds.h"
 #include "server.h"
 #include "cluster.h"
 #include "connection.h"
@@ -2635,7 +2636,12 @@ int invalidateClusterSlotsResp(const char **err) {
 static int updateLuaEnableInsecureApi(const char **err) {
     UNUSED(err);
     if (server.lua_insecure_api_current != server.lua_enable_insecure_api) {
+        sds config_name = sdsnew("lua.lua-enable-insecure-api");
+        standardConfig *config = lookupConfig(config_name);
+        serverAssert(config && config->flags & MODULE_CONFIG);
+        setModuleBoolConfig(config->privdata, server.lua_enable_insecure_api, NULL);
         evalReset(server.lazyfree_lazy_user_flush ? 1 : 0);
+        sdsfree(config_name);
     }
     server.lua_insecure_api_current = server.lua_enable_insecure_api;
     return 1;

src/eval.c

@@ -240,7 +240,7 @@ int evalExtractShebangFlags(sds body,
         }
 
         if (out_engine) {
-            uint32_t engine_name_len = sdslen(parts[0]) - 2;
+            size_t engine_name_len = sdslen(parts[0]) - 2;
             *out_engine = zcalloc(engine_name_len + 1);
             valkey_strlcpy(*out_engine, parts[0] + 2, engine_name_len + 1);
         }
@@ -442,7 +442,7 @@ static int evalRegisterNewScript(client *c, robj *body, char **sha) {
     }
     es->body = body;
     int retval = dictAdd(evalCtx.scripts, _sha, es);
-    serverAssertWithInfo(c ? c : scriptingEngineGetClient(engine), NULL, retval == DICT_OK);
+    serverAssert(retval == DICT_OK);
     evalCtx.scripts_mem += sdsAllocSize(_sha) + getStringObjectSdsUsedMemory(body);
     incrRefCount(body);
     zfree(functions);