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#include <stdlib.h>
#define NAPI_EXPERIMENTAL
#include <node_api.h>
#define NAPI_CALL(env, call) \
do { \
napi_status status = (call); \
if (status != napi_ok) { \
napi_throw_error((env), NULL, #call " failed"); \
return NULL; \
} \
} while (0)
static napi_value
GetCount(napi_env env, napi_callback_info info) {
napi_value result;
size_t* count;
NAPI_CALL(env, napi_get_instance_data(env, (void**)&count));
NAPI_CALL(env, napi_create_uint32(env, *count, &result));
return result;
}
static napi_value
SetCount(napi_env env, napi_callback_info info) {
size_t* count;
NAPI_CALL(env, napi_get_instance_data(env, (void**)&count));
// Set the count to zero irrespective of what is passed into the setter.
*count = 0;
return NULL;
}
static void
IncrementCounter(napi_env env, void* data, void* hint) {
size_t* count = data;
(*count) = (*count) + 1;
}
static napi_value
NewWeak(napi_env env, napi_callback_info info) {
napi_value result;
void* instance_data;
NAPI_CALL(env, napi_create_object(env, &result));
NAPI_CALL(env, napi_get_instance_data(env, &instance_data));
NAPI_CALL(env, napi_add_finalizer(env,
result,
instance_data,
IncrementCounter,
NULL,
NULL));
return result;
}
static void
FreeCount(napi_env env, void* data, void* hint) {
free(data);
}
/* napi_value */
NAPI_MODULE_INIT(/* napi_env env, napi_value exports */) {
napi_property_descriptor props[] = {
{ "count", NULL, NULL, GetCount, SetCount, NULL, napi_enumerable, NULL },
{ "newWeak", NULL, NewWeak, NULL, NULL, NULL, napi_enumerable, NULL }
};
size_t* count = malloc(sizeof(*count));
*count = 0;
NAPI_CALL(env, napi_define_properties(env,
exports,
sizeof(props) / sizeof(*props),
props));
NAPI_CALL(env, napi_set_instance_data(env, count, FreeCount, NULL));
return exports;
}
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