euh

node_modules/mongodb/lib/error.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const MongoNetworkError = require('mongodb-core').MongoNetworkError;
+const mongoErrorContextSymbol = require('mongodb-core').mongoErrorContextSymbol;
+
+const GET_MORE_NON_RESUMABLE_CODES = new Set([
+  136, // CappedPositionLost
+  237, // CursorKilled
+  11601 // Interrupted
+]);
+
+// From spec@https://github.com/mongodb/specifications/blob/35e466ddf25059cb30e4113de71cdebd3754657f/source/change-streams.rst#resumable-error:
+//
+// An error is considered resumable if it meets any of the following criteria:
+// - any error encountered which is not a server error (e.g. a timeout error or network error)
+// - any server error response from a getMore command excluding those containing the following error codes
+//   - Interrupted: 11601
+//   - CappedPositionLost: 136
+//   - CursorKilled: 237
+// - a server error response with an error message containing the substring "not master" or "node is recovering"
+//
+// An error on an aggregate command is not a resumable error. Only errors on a getMore command may be considered resumable errors.
+
+function isGetMoreError(error) {
+  if (error[mongoErrorContextSymbol]) {
+    return error[mongoErrorContextSymbol].isGetMore;
+  }
+}
+
+function isResumableError(error) {
+  if (!isGetMoreError(error)) {
+    return false;
+  }
+
+  return !!(
+    error instanceof MongoNetworkError ||
+    !GET_MORE_NON_RESUMABLE_CODES.has(error.code) ||
+    error.message.match(/not master/) ||
+    error.message.match(/node is recovering/)
+  );
+}
+
+module.exports = { GET_MORE_NON_RESUMABLE_CODES, isResumableError };