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Remove listener when unmounting component

This commit is contained in:
Franck Royer 2021-04-22 11:09:10 +10:00
parent 1e1ad0332c
commit 9937652105
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GPG Key ID: A82ED75A8DFC50A4
1 changed files with 19 additions and 11 deletions
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30
web-chat/src/App.tsx
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@ -27,7 +27,7 @@ export default function App() {
const waku = await Waku.create({});
setState(({ messages }) => {
return {waku, messages};
return { waku, messages };
});
waku.libp2p.peerStore.addressBook.add(
@ -39,21 +39,29 @@ export default function App() {
}
const handleNewMessages = (event: { data: Uint8Array }) => {
const wakuMsg = WakuMessage.decode(event.data);
if (wakuMsg.payload) {
const chatMsg = ChatMessage.decode(wakuMsg.payload);
const messages = state.messages.slice();
messages.push(chatMsg);
console.log('setState on ', messages);
setState({ messages, waku: state.waku });
}
};
if (!state.waku) {
initWaku()
.then(() => console.log('Waku init done'))
.catch((e) => console.log('Waku init failed ', e));
} else {
state.waku.libp2p.pubsub.on(RelayDefaultTopic, (event) => {
const wakuMsg = WakuMessage.decode(event.data);
if (wakuMsg.payload) {
const chatMsg = ChatMessage.decode(wakuMsg.payload);
const messages = state.messages.slice();
messages.push(chatMsg);
console.log("setState on ", messages);
setState({ messages, waku: state.waku });
}
});
state.waku.libp2p.pubsub.on(RelayDefaultTopic, handleNewMessages);
// To clean up listener when component unmounts
return () => {
state.waku?.libp2p.pubsub.removeListener(RelayDefaultTopic, handleNewMessages);
};
}
});