From d88635cbb28862e0efd79080e5c67865d0410238 Mon Sep 17 00:00:00 2001
From: siikamiika <siikamiika@users.noreply.github.com>
Date: Sun, 22 Mar 2020 04:55:16 +0200
Subject: temporary listener abstraction

---
 ext/mixed/js/core.js | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'ext/mixed')

diff --git a/ext/mixed/js/core.js b/ext/mixed/js/core.js
index fd762e97..f21bac23 100644
--- a/ext/mixed/js/core.js
+++ b/ext/mixed/js/core.js
@@ -312,6 +312,42 @@ const yomichan = (() => {
             this.trigger('orphaned', {error});
         }
 
+        getTemporaryListenerResult(eventHandler, userCallback, timeout=30000) {
+            let resolved = false;
+            let resolve;
+            let reject;
+            const listenerPromise = new Promise((_resolve, _reject) => {
+                resolve = _resolve;
+                reject = _reject;
+            });
+
+            if (eventHandler === chrome.runtime.onMessage) {
+                const runtimeMessageCallback = ({action, params}, sender, sendResponse) => {
+                    const cleanupResolve = (value) => {
+                        resolved = true;
+                        eventHandler.removeListener(runtimeMessageCallback);
+                        sendResponse();
+                        resolve(value);
+                    };
+
+                    setTimeout(() => {
+                        if (!resolved) {
+                            reject(new Error(`Listener timed out in ${timeout} ms`));
+                            eventHandler.removeListener(runtimeMessageCallback);
+                        }
+                    }, timeout);
+
+                    userCallback({action, params}, {resolve: cleanupResolve, sender});
+                };
+
+                eventHandler.addListener(runtimeMessageCallback);
+            } else {
+                throw new Error('Event handler type not supported');
+            }
+
+            return listenerPromise;
+        }
+
         // Private
 
         _onMessage({action, params}, sender, callback) {
-- 
cgit v1.2.3