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-rw-r--r--ext/bg/js/backend.js55
1 files changed, 55 insertions, 0 deletions
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index f17e8897..301fe135 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -1383,4 +1383,59 @@ class Backend {
// Edge throws exception for no reason here.
}
}
+
+ _waitUntilTabFrameIsReady(tabId, frameId, timeout=null) {
+ return new Promise((resolve, reject) => {
+ let timer = null;
+ let onMessage = (message, sender) => {
+ if (
+ !sender.tab ||
+ sender.tab.id !== tabId ||
+ sender.frameId !== frameId ||
+ !isObject(message) ||
+ message.action !== 'yomichanCoreReady'
+ ) {
+ return;
+ }
+
+ cleanup();
+ resolve();
+ };
+ const cleanup = () => {
+ if (timer !== null) {
+ clearTimeout(timer);
+ timer = null;
+ }
+ if (onMessage !== null) {
+ chrome.runtime.onMessage.removeListener(onMessage);
+ onMessage = null;
+ }
+ };
+
+ chrome.runtime.onMessage.addListener(onMessage);
+
+ chrome.tabs.sendMessage(tabId, {action: 'isReady'}, {frameId}, (response) => {
+ const error = chrome.runtime.lastError;
+ if (error) { return; }
+
+ try {
+ const value = yomichan.getMessageResponseResult(response);
+ if (!value) { return; }
+
+ cleanup();
+ resolve();
+ } catch (e) {
+ // NOP
+ }
+ });
+
+ if (timeout !== null) {
+ timer = setTimeout(() => {
+ timer = null;
+ cleanup();
+ reject(new Error('Timeout'));
+ }, timeout);
+ }
+ });
+ }
}