patch js in a better way, fix event loop logic

.gitignore

@@ -1,4 +1,5 @@
 /client/build
 /client/out
+/client/fragments/tmp
 /server/.venv
 /server/websockify

client/build.sh

@@ -14,10 +14,10 @@ WISP_CLIENT="wisp_client"
 EXPORTED_FUNCS="_init_curl,_start_request,_tick_request,_active_requests"
 RUNTIME_METHODS="addFunction,removeFunction,allocate,ALLOC_NORMAL"
 COMPILER_OPTIONS="-o $MODULE_FILE -lcurl -lssl -lcrypto -lcjson -lz -lbrotlidec -lbrotlicommon -I $INCLUDE_DIR -L $LIB_DIR"
-EMSCRIPTEN_OPTIONS="-lwebsocket.js -sASSERTIONS=1 -sALLOW_TABLE_GROWTH -sEXPORTED_FUNCTIONS=$EXPORTED_FUNCS -sEXPORTED_RUNTIME_METHODS=$RUNTIME_METHODS"
+EMSCRIPTEN_OPTIONS="-lwebsocket.js -sASSERTIONS=1 -sALLOW_TABLE_GROWTH -sALLOW_MEMORY_GROWTH -sEXPORTED_FUNCTIONS=$EXPORTED_FUNCS -sEXPORTED_RUNTIME_METHODS=$RUNTIME_METHODS"
 
 if [ "$1" = "release" ]; then
-  COMPILER_OPTIONS="-O3 -flto $COMPILER_OPTIONS"
+  COMPILER_OPTIONS="-Oz -flto $COMPILER_OPTIONS"
   EMSCRIPTEN_OPTIONS="-sSINGLE_FILE $EMSCRIPTEN_OPTIONS"
 else
   COMPILER_OPTIONS="$COMPILER_OPTIONS --profiling"
@@ -36,22 +36,19 @@ COMPILE_CMD="emcc main.c $COMPILER_OPTIONS $EMSCRIPTEN_OPTIONS"
 echo $COMPILE_CMD
 $COMPILE_CMD
 
-#patch the output to work around some emscripten bugs
-sed -i 's/err("__syscall_getsockname " \?+ \?fd);//' $MODULE_FILE
-sed -i 's/function _emscripten_console_error(str) {/& if(UTF8ToString(str).endsWith("__syscall_setsockopt\\n")) return;/' $MODULE_FILE
-sed -i "s/var \?opts \?= \?undefined;/& var parts=addr.split('\/');url=url+parts[0]+':'+port;/" $MODULE_FILE
-
 #merge compiled emscripten module and wrapper code
 cp $WRAPPER_SOURCE $OUT_FILE
 sed -i "/__emscripten_output__/r $MODULE_FILE" $OUT_FILE
 rm $MODULE_FILE
 
 #add wisp libraries
-sed -i "s/new WebSocketConstructor/new WispWebSocket/" $OUT_FILE
 sed -i "/__extra_libraries__/r $WISP_CLIENT/polyfill.js" $OUT_FILE
 sed -i "/__extra_libraries__/r $WISP_CLIENT/wisp.js" $OUT_FILE
 sed -i "/__extra_libraries__/r ./messages.js" $OUT_FILE
 
+#apply patches
+python3 patcher.py $FRAGMENTS_DIR $OUT_FILE
+
 #generate es6 module
 cp $OUT_FILE $ES6_FILE
 sed -i 's/window.libcurl/export const libcurl/' $ES6_FILE

client/fragments/force_wsproxy.js

@@ -0,0 +1,5 @@
+/* INSERT
+var ?opts ?= ?undefined;
+*/
+var parts=addr.split("/");
+url = url + parts[0] + ":" + port;

client/fragments/silence_socket.js

@@ -0,0 +1,9 @@
+/* DELETE
+err\("__syscall_getsockname " ?\+ ?fd\);
+*/
+
+
+/* INSERT
+function _emscripten_console_error\(str\) {
+*/
+if (UTF8ToString(str).endsWith("__syscall_setsockopt\\n")) return;

client/fragments/wisp_support.js

@@ -0,0 +1,4 @@
+/* REPLACE
+new WebSocketConstructor
+*/
+new WispWebSocket

client/main.c

@@ -50,14 +50,6 @@ void tick_request() {
   
   mc = curl_multi_perform(multi_handle, &request_active);
 
-  if(!mc)
-    mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
-
-  if(mc) {
-    fprintf(stderr, "curl_multi_poll() failed, code %d.\n", (int)mc);
-    return;
-  }
-
   int msgq = 0;
   curl_msg = curl_multi_info_read(multi_handle, &msgq);
   if (curl_msg && curl_msg->msg == CURLMSG_DONE) {

client/main.js

@@ -8,6 +8,7 @@ window.libcurl = (function() {
 /* __extra_libraries__ */
 
 const websocket_url = `wss://${location.hostname}/ws/`;
+var event_loop = null;
 
 //a case insensitive dictionary for request headers
 class Headers {
@@ -88,15 +89,16 @@ function perform_request(url, params, js_data_callback, js_end_callback, body=nu
   data_callback_ptr = Module.addFunction(data_callback, "vii");
   _start_request(url_ptr, params_ptr, data_callback_ptr, end_callback_ptr, body_ptr, body_length);
   _free(params_ptr);
-
-  if (!_active_requests()) {
-    //time out requests after a while
-    let event_loop = setInterval(() => {
+  
+  _tick_request();
+  if (!event_loop) {
+    event_loop = setInterval(() => {
       _tick_request();
       if (!_active_requests()) {
         clearInterval(event_loop);
+        event_loop = null;
       }
-    }, 500);
+    }, 0);
   }
 }
 

client/patcher.py

@@ -0,0 +1,26 @@
+import re
+import sys
+import pathlib
+
+match_regex = r'/\* (.+?)\n(.+?)\n\*/\n(.*?)(\n\n|$)'
+
+fragments_dir = sys.argv[1]
+target_dir = sys.argv[2]
+fragments_path = pathlib.Path(fragments_dir)
+target_path = pathlib.Path(target_dir)
+target_text = target_path.read_text()
+
+for fragment_file in fragments_path.iterdir():
+  print(f"applying patch from {fragment_file.name}")
+  fragment_text = fragment_file.read_text()
+  matches = re.findall(match_regex, fragment_text, re.S)
+
+  for mode, patch_regex, patch_text, _ in matches:
+    if mode == "DELETE":
+      target_text = re.sub(patch_regex, "", target_text)
+    elif mode == "REPLACE":
+      target_text = re.sub(patch_regex, patch_text, target_text)
+    elif mode == "INSERT":
+      target_text = re.sub("("+patch_regex+")", r'\1'+patch_text, target_text)
+
+target_path.write_text(target_text)