fetch.c
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fetch.c
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	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <curl/curl.h>

	#include "runtime.h"
	#include "modules/fetch.h"
	#include "modules/timer.h"

	typedef struct {
	char *data;
	size_t size;
	} fetch_buffer_t;

	static CURL *global_curl = NULL;
	static void cleanup_fetch_module(void);

	static size_t write_callback(void contents, size_t size, size_t nmemb, void userp) {
	size_t realsize = size * nmemb;
	fetch_buffer_t buf = (fetch_buffer_t )userp;

	char *ptr = realloc(buf->data, buf->size + realsize + 1);
	if (!ptr) return 0;

	buf->data = ptr;
	memcpy(&(buf->data[buf->size]), contents, realsize);
	buf->size += realsize;
	buf->data[buf->size] = 0;

	return realsize;
	}

	static jsval_t create_response(struct js js, int status, const char body, size_t body_len) {
	jsval_t response_obj = js_mkobj(js);

	js_set(js, response_obj, "status", js_mknum(status));
	js_set(js, response_obj, "ok", status >= 200 && status < 300 ? js_mktrue() : js_mkfalse());
	js_set(js, response_obj, "__body", js_mkstr(js, body, body_len));

	const char *json_code = "(){return JSON.parse(this.__body)}";
	jsval_t json_str = js_mkstr(js, json_code, strlen(json_code));
	jsval_t json_obj = js_mkobj(js);
	js_set(js, json_obj, "__code", json_str);
	jsval_t json_func = js_mknum(0);
	memcpy(&json_func, &json_obj, sizeof(jsval_t));
	json_func = (json_func & 0xFFFFFFFFFFFFULL) \| (0x7FF0000000000000ULL \| ((uint64_t)7 << 48));
	js_set(js, response_obj, "json", json_func);

	const char *text_code = "(){return this.__body}";
	jsval_t text_str = js_mkstr(js, text_code, strlen(text_code));
	jsval_t text_obj = js_mkobj(js);
	js_set(js, text_obj, "__code", text_str);
	jsval_t text_func = js_mknum(0);
	memcpy(&text_func, &text_obj, sizeof(jsval_t));
	text_func = (text_func & 0xFFFFFFFFFFFFULL) \| (0x7FF0000000000000ULL \| ((uint64_t)7 << 48));
	js_set(js, response_obj, "text", text_func);

	return response_obj;
	}

	static jsval_t do_fetch_microtask(struct js js, jsval_t args, int nargs) {
	(void)args;
	(void)nargs;

	jsval_t current_func = js_getcurrentfunc(js);
	jsval_t url_val = js_get(js, current_func, "url");
	jsval_t options_val = js_get(js, current_func, "options");
	jsval_t promise = js_get(js, current_func, "promise");

	char *url_str = js_getstr(js, url_val, NULL);
	if (!url_str) {
	jsval_t err = js_mkstr(js, "Invalid URL", 11);
	js_reject_promise(js, promise, err);
	return js_mkundef();
	}

	const char *method = "GET";
	char *body = NULL;

	if (js_type(options_val) != JS_UNDEF && js_type(options_val) != JS_NULL) {
	jsval_t method_val = js_get(js, options_val, "method");
	if (js_type(method_val) == JS_STR) {
	method = js_getstr(js, method_val, NULL);
	}

	jsval_t body_val = js_get(js, options_val, "body");
	if (js_type(body_val) == JS_STR) {
	body = js_getstr(js, body_val, NULL);
	}
	}

	CURL *curl = global_curl;
	if (!curl) {
	jsval_t err = js_mkstr(js, "CURL not initialized", 20);
	js_reject_promise(js, promise, err);
	return js_mkundef();
	}

	fetch_buffer_t response_buf = { .data = malloc(1), .size = 0 };
	if (!response_buf.data) {
	jsval_t err = js_mkstr(js, "Memory allocation failed", 24);
	js_reject_promise(js, promise, err);
	return js_mkundef();
	}

	curl_easy_reset(curl);

	curl_easy_setopt(curl, CURLOPT_URL, url_str);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response_buf);
	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);

	if (strcmp(method, "GET") != 0) {
	curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, method);
	}

	struct curl_slist *headers = NULL;
	if (js_type(options_val) != JS_UNDEF && js_type(options_val) != JS_NULL) {
	jsval_t headers_val = js_get(js, options_val, "headers");
	if (js_type(headers_val) != JS_UNDEF && js_type(headers_val) != JS_NULL) {
	js_prop_iter_t iter = js_prop_iter_begin(js, headers_val);
	const char *key;
	size_t key_len;
	jsval_t value;

	while (js_prop_iter_next(&iter, &key, &key_len, &value)) {
	char *value_str = js_getstr(js, value, NULL);
	if (value_str) {
	char header_line[1024];
	snprintf(header_line, sizeof(header_line), "%.*s: %s", (int)key_len, key, value_str);
	headers = curl_slist_append(headers, header_line);
	}
	}
	js_prop_iter_end(&iter);

	if (headers) {
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
	}
	}
	}

	if (body) {
	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, body);
	curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(body));
	}

	CURLcode res = curl_easy_perform(curl);
	if (headers) curl_slist_free_all(headers);

	if (res != CURLE_OK) {
	free(response_buf.data);
	const char *err_msg = curl_easy_strerror(res);
	jsval_t err = js_mkstr(js, err_msg, strlen(err_msg));
	js_reject_promise(js, promise, err);
	return js_mkundef();
	}

	long status_code = 0;
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &status_code);

	jsval_t response = create_response(js, (int)status_code, response_buf.data, response_buf.size);

	free(response_buf.data);
	js_resolve_promise(js, promise, response);

	return js_mkundef();
	}

	static jsval_t js_fetch(struct js js, jsval_t args, int nargs) {
	if (nargs < 1) {
	return js_mkerr(js, "fetch requires at least 1 argument");
	}

	if (js_type(args[0]) != JS_STR) {
	return js_mkerr(js, "fetch URL must be a string");
	}

	jsval_t url_val = args[0];
	jsval_t options_val = nargs > 1 ? args[1] : js_mkundef();

	jsval_t promise = js_mkpromise(js);

	jsval_t wrapper_obj = js_mkobj(js);
	js_set(js, wrapper_obj, "__native_func", js_mkfun(do_fetch_microtask));
	js_set(js, wrapper_obj, "url", url_val);
	js_set(js, wrapper_obj, "options", options_val);
	js_set(js, wrapper_obj, "promise", promise);

	jsval_t wrapper_func = js_mknum(0);
	memcpy(&wrapper_func, &wrapper_obj, sizeof(jsval_t));
	wrapper_func = (wrapper_func & 0xFFFFFFFFFFFFULL) \| (0x7FF0000000000000ULL \| ((uint64_t)7 << 48));
	queue_microtask(js, wrapper_func);

	return promise;
	}

	void init_fetch_module(void) {
	static int curl_initialized = 0;
	if (!curl_initialized) {
	curl_global_init(CURL_GLOBAL_DEFAULT);
	curl_initialized = 1;

	global_curl = curl_easy_init();
	if (!global_curl) {
	fprintf(stderr, "Warning: Failed to initialize CURL handle\n");
	}

	atexit(cleanup_fetch_module);
	}

	struct js *js = rt->js;
	js_set(js, js_glob(js), "fetch", js_mkfun(js_fetch));
	}

	static void cleanup_fetch_module(void) {
	if (global_curl) {
	curl_easy_cleanup(global_curl);
	global_curl = NULL;
	}
	curl_global_cleanup();
	}

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