Create N-API methods
This commit is contained in:
Wilson Lin
parent
6143b852e1
commit
715dffb8de
251
nodejs/binding.c
251
nodejs/binding.c
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@ -1,4 +1,6 @@
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#define NAPI_VERSION 4
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#include <node_api.h>
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@ -6,3 +8,252 @@
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typedef struct Cfg Cfg;
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#include <minify_html_ffi.h>
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static inline void* assert_malloc(size_t bytes) {
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void* ptr = malloc(bytes);
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if (ptr == NULL) {
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// TODO
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}
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return ptr;
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}
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static inline void assert_ok(napi_status status) {
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if (status != napi_ok) {
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// TODO
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}
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}
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static inline napi_value get_undefined(napi_env env) {
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napi_value undefined;
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assert_ok(napi_get_undefined(env, &undefined));
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return undefined;
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}
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typedef napi_status (*napi_is_pred)(napi_env env, napi_value value, bool* result);
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static inline bool napi_is(napi_env env, napi_value value, napi_is_pred pred) {
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bool res;
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assert_ok(pred(env, value, &res));
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return res;
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}
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typedef struct js_min_buf_metadata {
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napi_ref src_buf_ref;
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} js_min_buf_metadata;
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void js_cfg_finalizer(napi_env env, void* finalize_data, void* _finalize_hint) {
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ffi_drop_cfg((Cfg const*) finalize_data);
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}
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void js_min_buf_finalizer(napi_env env, void* _finalize_data, void* finalize_hint) {
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js_min_buf_metadata* metadata = (js_min_buf_metadata*) finalize_hint;
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assert_ok(napi_delete_reference(env, metadata->src_buf_ref));
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free(metadata);
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}
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void js_copy_min_buf_finalizer(napi_env env, void* _finalize_data, void* finalize_hint) {
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free(finalize_hint);
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}
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napi_value node_method_create_configuration(napi_env env, napi_callback_info info) {
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napi_value undefined = get_undefined(env);
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size_t argc = 1;
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napi_value argv[1];
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napi_value _this;
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void* _data;
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// Get the arguments.
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if (napi_get_cb_info(env, info, &argc, argv, &_this, &_data) != napi_ok) {
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assert_ok(napi_throw_error(env, NULL, "Failed to get callback info"));
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return undefined;
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}
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napi_value obj_arg = argv[0];
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// Get `minifyJs` property.
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napi_value minify_js_value;
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if (napi_get_named_property(env, obj_arg, "minifyJs", &minify_js_value) != napi_ok) {
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assert_ok(napi_throw_type_error(env, NULL, "Failed to get minifyJs property"));
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return undefined;
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}
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bool minify_js;
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if (napi_get_value_bool(env, minify_js_value, &minify_js) != napi_ok) {
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assert_ok(napi_throw_type_error(env, NULL, "Failed to get minifyJs boolean property"));
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return undefined;
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}
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Cfg const* cfg = ffi_create_cfg(minify_js);
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napi_value js_cfg;
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if (napi_create_external(env, (void*) cfg, js_cfg_finalizer, NULL, &js_cfg) != napi_ok) {
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assert_ok(napi_throw_error(env, NULL, "Failed to create return value"));
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return undefined;
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}
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return js_cfg;
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}
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napi_value node_method_minify_in_place(napi_env env, napi_callback_info info) {
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napi_value undefined = get_undefined(env);
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bool buffer_arg_ref_set = false;
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napi_ref buffer_arg_ref;
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js_min_buf_metadata* min_buf_meta = NULL;
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ffi_error const* min_err = NULL;
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size_t argc = 2;
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napi_value argv[2];
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napi_value _this;
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void* _data;
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// Get the arguments.
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if (napi_get_cb_info(env, info, &argc, argv, &_this, &_data) != napi_ok) {
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assert_ok(napi_throw_error(env, NULL, "Failed to get callback info"));
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goto rollback;
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}
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napi_value buffer_arg = argv[0];
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napi_value js_cfg_arg = argv[1];
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// Ensure buffer lives along side minified buffer (both point to same memory).
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if (napi_create_reference(env, buffer_arg, 1, &buffer_arg_ref) != napi_ok) {
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assert_ok(napi_throw_error(env, NULL, "Failed to create reference for source buffer"));
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goto rollback;
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}
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buffer_arg_ref_set = true;
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// Get pointer to bytes in buffer.
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void* buffer_data;
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size_t buffer_len;
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if (napi_get_buffer_info(env, buffer_arg, &buffer_data, &buffer_len) != napi_ok || buffer_data == NULL) {
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assert_ok(napi_throw_type_error(env, NULL, "Failed to read source buffer"));
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goto rollback;
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}
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// Get Cfg.
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void* cfg_raw;
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if (napi_get_value_external(env, js_cfg_arg, &cfg_raw) != napi_ok) {
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assert_ok(napi_throw_type_error(env, NULL, "Failed to get configuration"));
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goto rollback;
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}
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Cfg const* cfg = (Cfg const*) cfg_raw;
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// Run minifier in place.
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size_t min_len;
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min_err = ffi_in_place(buffer_data, buffer_len, cfg, &min_len);
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if (min_err != NULL) {
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// TODO
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assert_ok(napi_throw_error(env, NULL, "Failed to run minifier"));
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goto rollback;
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}
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// Create minified buffer with underlying source memory but minified length.
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min_buf_meta = assert_malloc(sizeof(js_min_buf_metadata));
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min_buf_meta->src_buf_ref = buffer_arg_ref;
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napi_value min_buf;
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if (napi_create_external_buffer(env, min_len, buffer_data, js_min_buf_finalizer, min_buf_meta, &min_buf) != napi_ok) {
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assert_ok(napi_throw_error(env, NULL, "Failed to create minified buffer"));
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goto rollback;
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}
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return min_buf;
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rollback:
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if (buffer_arg_ref_set) {
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// Release source buffer.
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assert_ok(napi_delete_reference(env, buffer_arg_ref));
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}
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if (min_err != NULL) {
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ffi_drop_ffi_error(min_err);
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}
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free(min_buf_meta);
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return undefined;
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}
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napi_value node_method_minify(napi_env env, napi_callback_info info) {
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napi_value undefined = get_undefined(env);
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void* src_data_copy = NULL;
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ffi_error const* min_err = NULL;
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size_t argc = 2;
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napi_value argv[2];
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napi_value _this;
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void* _data;
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// Get the arguments.
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if (napi_get_cb_info(env, info, &argc, argv, &_this, &_data) != napi_ok) {
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assert_ok(napi_throw_error(env, NULL, "Failed to get callback info"));
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goto rollback;
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}
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napi_value src_arg = argv[0];
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napi_value js_cfg_arg = argv[1];
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size_t src_data_len;
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if (napi_is(env, src_arg, napi_is_buffer)) {
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// Get pointer to bytes in buffer.
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void* buffer_data;
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if (napi_get_buffer_info(env, src_arg, &buffer_data, &src_data_len) != napi_ok || buffer_data == NULL) {
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assert_ok(napi_throw_type_error(env, NULL, "Failed to read source buffer"));
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goto rollback;
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}
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src_data_copy = assert_malloc(src_data_len);
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memcpy(src_data_copy, buffer_data, src_data_len);
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} else {
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// Assume string.
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if (napi_get_value_string_utf8(env, src_arg, NULL, 0, &src_data_len) != napi_ok) {
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assert_ok(napi_throw_type_error(env, NULL, "Failed to read source string"));
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goto rollback;
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}
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src_data_copy = assert_malloc(src_data_len + 1);
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size_t bytes_copied;
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if (napi_get_value_string_utf8(env, src_arg, src_data_copy, src_data_len + 1, &bytes_copied) != napi_ok
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|| bytes_copied != src_data_len) {
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assert_ok(napi_throw_error(env, NULL, "Failed to copy source string"));
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goto rollback;
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}
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}
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// Get Cfg.
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void* cfg_raw;
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if (napi_get_value_external(env, js_cfg_arg, &cfg_raw) != napi_ok) {
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assert_ok(napi_throw_type_error(env, NULL, "Failed to get configuration"));
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goto rollback;
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}
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Cfg const* cfg = (Cfg const*) cfg_raw;
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// Run minifier in place.
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size_t min_len;
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min_err = ffi_in_place(src_data_copy, src_data_len, cfg, &min_len);
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if (min_err != NULL) {
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// TODO
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assert_ok(napi_throw_error(env, NULL, "Failed to run minifier"));
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goto rollback;
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}
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// Create minified buffer with copied memory.
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napi_value min_buf;
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if (napi_create_external_buffer(env, min_len, src_data_copy, js_copy_min_buf_finalizer, src_data_copy, &min_buf) != napi_ok) {
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assert_ok(napi_throw_error(env, NULL, "Failed to create minified buffer"));
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goto rollback;
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}
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return min_buf;
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rollback:
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free(src_data_copy);
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if (min_err != NULL) {
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ffi_drop_ffi_error(min_err);
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}
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return undefined;
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}
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napi_value node_module_init(napi_env env, napi_value exports) {
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napi_property_descriptor props[] = {
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{"createConfiguration", NULL, node_method_create_configuration, NULL, NULL, NULL, napi_default, NULL},
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{"minify", NULL, node_method_minify, NULL, NULL, NULL, napi_default, NULL},
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{"minifyInPlace", NULL, node_method_minify_in_place, NULL, NULL, NULL, napi_default, NULL},
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};
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assert_ok(napi_define_properties(env, exports, 3, props));
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return exports;
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}
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NAPI_MODULE(NODE_GYP_MODULE_NAME, node_module_init)
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@ -2,16 +2,16 @@ use std::{mem, ptr, slice};
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use minify_html::{Cfg, Error, in_place};
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#[no_mangle]
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pub extern "C" fn ffi_create_cfg(minify_js: bool) -> *mut Cfg {
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pub extern "C" fn ffi_create_cfg(minify_js: bool) -> *const Cfg {
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Box::into_raw(Box::new(Cfg {
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minify_js,
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}))
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}
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#[no_mangle]
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pub extern "C" fn ffi_drop_cfg(cfg: *mut Cfg) -> () {
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pub extern "C" fn ffi_drop_cfg(cfg: *const Cfg) -> () {
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unsafe {
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Box::from_raw(cfg);
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Box::from_raw(cfg as *mut Cfg);
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};
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}
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@ -23,9 +23,9 @@ pub struct ffi_error {
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}
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#[no_mangle]
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pub extern "C" fn ffi_drop_ffi_error(ffi_error_ptr: *mut ffi_error) -> () {
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pub extern "C" fn ffi_drop_ffi_error(ffi_error_ptr: *const ffi_error) -> () {
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unsafe {
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let ffi_error = Box::from_raw(ffi_error_ptr);
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let ffi_error = Box::from_raw(ffi_error_ptr as *mut ffi_error);
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let _ = String::from_raw_parts(ffi_error.message, ffi_error.message_len, ffi_error.message_len);
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};
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}
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