remove emscripten socket file descriptor limit

client/exported_funcs.txt

@@ -27,4 +27,6 @@ tls_socket_set_options
 recv_from_socket
 send_to_socket
 
+ftp_set_options
+
 free

client/fragments/fix_socket_limit.js

@@ -0,0 +1,3 @@
+/* DELETE
+assert\(sock\.stream\.fd ?< ?64\);
+*/

client/javascript/ftp.js

@@ -0,0 +1,44 @@
+//unfinished!
+
+class FTPSession {
+  constructor(url, options={}) {
+    if (!url.startsWith("ftp://") || !url.startsWith("ftps://")) {
+      throw "invalid url protocol";
+    }
+
+    this.url = url;
+    this.cwd = new URL(url).pathname;
+    this.options = options;
+    this.http_handle = null;
+  }
+
+  do_request(url) {
+    return new Promise((resolve, reject) => {
+      let http_handle;
+      let data_callback = (data) => {this.data_callback(data)};
+      let finish_callback = (error) => {
+        _cleanup_handle(http_handle);
+        if (error) {
+          reject();
+        }
+        else {
+          resolve();
+        }
+      };
+      let headers_callback = () => {this.headers_callback()};
+
+      http_handle = create_handle(url, data_callback, finish_callback, headers_callback);
+      _ftp_set_options(http_handle, url, 1);
+      start_request(http_handle);
+    });
+  }
+
+  async download(path) {
+    let url = new URL(path, this.url);
+    _ftp_set_options(this.http_handle, url, 0);
+  }
+
+  cleanup() {
+
+  }
+}

client/libcurl/ftp.c

@@ -0,0 +1,9 @@
+#include "curl/curl.h"
+
+#include "types.h"
+#include "util.h"
+
+void ftp_set_options(CURL* http_handle, const char* url, int no_body) {
+  curl_easy_setopt(http_handle, CURLOPT_NOBODY, (long) no_body);
+  curl_easy_setopt(http_handle, CURLOPT_URL, url);
+}

client/libcurl/main.c

@@ -119,11 +119,6 @@ void init_curl() {
   curl_global_init(CURL_GLOBAL_DEFAULT);
   multi_handle = curl_multi_init();
 
-  //emscripten has a fairly low file descriptor limit which means
-  //we must limit the total number of active tcp connections
-  curl_multi_setopt(multi_handle, CURLMOPT_MAX_TOTAL_CONNECTIONS, 50L);
-  curl_multi_setopt(multi_handle, CURLMOPT_MAXCONNECTS, 40L);
-  
   cacert_blob.data = _cacert_pem;
   cacert_blob.len = _cacert_pem_len;
   cacert_blob.flags = CURL_BLOB_NOCOPY;