[ai] tcp optimizations

src/DirectoryNode.cpp

@@ -46,6 +46,11 @@ const String &DirectoryNode::getDirPath() const
     return dirPath;
 }
 
+uint16_t DirectoryNode::getFileIdAt(size_t i) const
+{
+    return (i < ids.size()) ? ids[i] : 0;
+}
+
 
 
 String DirectoryNode::buildFullPath(const String &fileName) const
@@ -279,10 +284,7 @@ void DirectoryNode::printDirectoryTree(int level) const
         {
             Serial.print(F("  "));
         }
-        
-        // Use buffer for building path
-        buildFullPath(mp3File, buffer, buffer_size);
-        Serial.println(buffer);
+        Serial.println(mp3File);
     }
     
     for (DirectoryNode *childNode : subdirectories)
@@ -647,7 +649,12 @@ DirectoryNode *DirectoryNode::advanceToNextMP3(const String &currentGlobal)
     return this;
 }
 
-
+/**
+ * @brief Not used anymore due to new 
+ * backpressure-safe, low-heap HTML streaming solution to prevent AsyncTCP cbuf resize OOM during /directory.
+ * 
+ * @param out 
+ */
 void DirectoryNode::streamDirectoryHTML(Print &out) const {
 #ifdef DEBUG 
     Serial.printf("StreamDirectoryHTML name=%s numOfFiles=%i\n", name, mp3Files.size());
@@ -670,20 +677,15 @@ void DirectoryNode::streamDirectoryHTML(Print &out) const {
         out.print(F("<li data-id=\""));
         out.print(ids[i]);
         out.print(F("\">"));
-        buildFullPath(mp3Files[i], buffer, buffer_size);
-        out.print(buffer);
+        out.print(mp3Files[i].c_str());
         out.println(F("</li>"));
-#ifdef DEBUG        
-        Serial.printf("stream song: %s\n", buffer);
-#endif        
+  
         // Yield every few items to allow the async web server to send buffered data
         if (i % 5 == 4) {
             yield();
         }
     }
 
-    out.flush();
-
     for (DirectoryNode* child : subdirectories) {
         child->streamDirectoryHTML(out);
     }