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-rw-r--r--ext/mixed/js/core.js36
1 files changed, 36 insertions, 0 deletions
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) {