fix random segfaults

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Libcurl.js Changelog:
 
+## v0.6.6 (3/20/24):
+- Fix random segfaults due to an improper invocation of libcurl
+
 ## v0.6.5 (3/20/24):
 - Update Wisp client and server
 - Compile WolfSSL with greater site support

client/build.sh

@@ -51,6 +51,7 @@ if [[ "$*" == *"release"* ]]; then
   echo "note: building with release optimizations"
 else
   COMPILER_OPTIONS="$COMPILER_OPTIONS --profiling -g"
+  EMSCRIPTEN_OPTIONS="$EMSCRIPTEN_OPTIONS -sSTACK_OVERFLOW_CHECK=2 -sSAFE_HEAP=1"
 fi
 
 if [[ "$*" == *"single_file"* ]]; then

client/javascript/session.js

@@ -7,6 +7,7 @@ class CurlSession {
     this.active_requests = 0;
     this.event_loop = null;
     this.requests_list = [];
+    this.to_remove = [];
   }
 
   assert_ready() {
@@ -54,16 +55,20 @@ class CurlSession {
     return request_ptr;
   }
 
-  remove_request(request_ptr) {
+  remove_request_now(request_ptr) {
-    this.assert_ready();
     _session_remove_request(this.session_ptr, request_ptr);
-
     let request_index = this.requests_list.indexOf(request_ptr);
     if (request_index !== -1) {
       this.requests_list.splice(request_index, 1);
     }
   }
 
+  //remove the request on the next iteration of the loop
+  remove_request(request_ptr) {
+    this.assert_ready();
+    this.to_remove.push(request_ptr);
+  }
+
   start_request(request_ptr) {
     this.assert_ready();
     _session_add_request(this.session_ptr, request_ptr);
@@ -77,21 +82,31 @@ class CurlSession {
     }
     
     this.event_loop = setInterval(() => {
+      this.event_loop_func();
+    }, 0);
+  }
+
+  event_loop_func() {
     let libcurl_active = _session_get_active(this.session_ptr);
-      if (libcurl_active || this.active_requests) {
+    if (libcurl_active || this.active_requests || this.to_remove) {
+      if (this.to_remove.length) {
+        for (let request_ptr of this.to_remove) {
+          this.remove_request_now(request_ptr);
+        }
+        this.to_remove = [];
+      }
       _session_perform(this.session_ptr);
     }
     else {
       clearInterval(this.event_loop);
       this.event_loop = null;
     }
-    }, 0);
   }
 
   close() {
     this.assert_ready();
     for (let request_ptr of this.requests_list) {
-      this.remove_request(request_ptr);
+      this.remove_request_now(request_ptr);
     }
     _session_cleanup(this.session_ptr);
     this.session_ptr = null;