js: add configuration option on startup

--

* src/index.js: Added an optional configuration object for the startup.

* configuration: timeout - the initial check for a connection ran into
  timeouts on slower testing machines. 500ms for initial startup is
  not sufficient everywhere. The default timeout was raised to 1000ms,
  and as an option this timeout can be increased even further.

* BrowsertestExtension: Set the initial connection timeouts to 2
  seconds, to be able to test on slower machines.

2 files changed, 12 insertions, 4 deletions

diff --git a/lang/js/src/Connection.js b/lang/js/src/Connection.js
index 4055da6a..d43d55f1 100644
--- a/lang/js/src/Connection.js
+++ b/lang/js/src/Connection.js
@@ -74,11 +74,15 @@ export class Connection{
      * Retrieves the information about the backend.
      * @param {Boolean} details (optional) If set to false, the promise will
      *  just return if a connection was successful.
+     * @param {Number} timeout (optional)
      * @returns {Promise<backEndDetails>|Promise<Boolean>} Details from the
      * backend
      * @async
      */
-    checkConnection (details = true){
+    checkConnection (details = true, timeout = 1000){
+        if (typeof timeout !== 'number' && timeout <= 0) {
+            timeout = 1000;
+        }
         const msg = createMessage('version');
         if (details === true) {
             return this.post(msg);
@@ -90,7 +94,7 @@ export class Connection{
                     new Promise(function (resolve, reject){
                         setTimeout(function (){
                             reject(gpgme_error('CONN_TIMEOUT'));
-                        }, 500);
+                        }, timeout);
                     })
                 ]).then(function (){ // success
                     resolve(true);
diff --git a/lang/js/src/index.js b/lang/js/src/index.js
index c52460cc..b8e4274d 100644
--- a/lang/js/src/index.js
+++ b/lang/js/src/index.js
@@ -31,13 +31,17 @@ import { Connection } from './Connection';
  * connection once, and then offers the available functions as method of the
  * response object.
  * An unsuccessful attempt will reject as a GPGME_Error.
+ * @param {Object} config (optional) configuration options
+ * @param {Number} config.timeout set the timeout for the initial connection
+ * check. On some machines and operating systems a default timeout of 500 ms is
+ * too low, so a higher number might be attempted.
  * @returns {Promise<GpgME>}
  * @async
  */
-function init (){
+function init ({ timeout = 500 } = {}){
     return new Promise(function (resolve, reject){
         const connection = new Connection;
-        connection.checkConnection(false).then(
+        connection.checkConnection(false, timeout).then(
             function (result){
                 if (result === true) {
                     resolve(new GpgME());