add dynamic module loader

2 files changed, 69 insertions, 0 deletions

diff --git a/lib/iono.js b/lib/iono.js
new file mode 100644
index 0000000000..e9178b8eec
--- /dev/null
+++ b/lib/iono.js
@@ -0,0 +1,68 @@
+// Copyright (C) 2021 Taler Systems SA
+//
+// This file is part of GNU Taler.
+//
+// GNU Taler is free software: you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
+// more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with GNU.  If not, see <https://www.gnu.org/licenses/>.
+
+
+'use strict';
+
+const iono = internalBinding("iono");
+
+const mod = require('module');
+mod._saved_findPath = mod._findPath;
+mod._ionoMods = {};
+mod._findPath = (request, paths, isMain) => {
+  const res = mod._saved_findPath(request, paths, isMain);
+  if (res !== false) return res;
+  const loadResult = iono.getModuleCode(request);
+  if (!loadResult) return false;
+  const p = `/vmod/${request}`;
+  mod._ionoMods[p] = loadResult;
+  return p;
+};
+
+function stripBOM(content) {
+  if (content.charCodeAt(0) === 0xFEFF) {
+    content = content.slice(1);
+  }
+  return content;
+}
+
+mod._saved_js_extension = mod._extensions[".js"];
+mod._extensions[".js"] = (module, filename) => {
+  if (mod._ionoMods.hasOwnProperty(filename)) {
+    const imod = mod._ionoMods[filename];
+    const content = imod;
+    module._compile(stripBOM(content), filename);
+    return;
+  }
+  return mod._saved_js_extension(module, filename);
+};
+
+mod._saved_json_extension = mod._extensions[".json"];
+mod._extensions[".json"] = (module, filename) => {
+  if (mod._ionoMods.hasOwnProperty(filename)) {
+    const imod = mod._ionoMods[filename];
+    const content = imod;
+    try {
+      module.exports = JSON.parse(stripBOM(content));
+      return;
+    } catch (err) {
+      err.message = filename + ': ' + err.message;
+      throw err;
+    }
+  }
+  return mod._saved_json_extension(module, filename);
+};
diff --git a/node.gyp b/node.gyp
index 2dd743331c..26a3097384 100644
--- a/node.gyp
+++ b/node.gyp
@@ -69,6 +69,7 @@
       'lib/_http_server.js',
       'lib/https.js',
       'lib/inspector.js',
+      'lib/iono.js',
       'lib/module.js',
       'lib/net.js',
       'lib/os.js',