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import { LRUCache } from './lru-cache.js'; | |
const FirebaseQueryAction = { | |
snapshotReceived: 'FIREBASE_QUERY_SNAPSHOT_RECEIVED', | |
created: 'FIREBASE_QUERY_CREATED' | |
}; | |
const FirebaseQueryActionCreatorCache = (maxRealtimeQueries = 10) => { | |
const cache = new LRUCache( | |
maxRealtimeQueries, | |
({ query, unsubscribe }) => unsubscribe()); | |
const db = firebase.firestore(); | |
return (key, queryFactory) => dispatch => { | |
const existingQuery = cache.get(key); | |
if (existingQuery == null) { | |
const query = queryFactory(db); | |
const unsubscribe = query.onSnapshot(querySnapshot => { | |
dispatch({ | |
type: FirebaseQueryAction.snapshotReceived, | |
payload: { key, querySnapshot } | |
}); | |
}); | |
cache.set(cacheKey, { query, unsubscribe }); | |
dispatch({ | |
type: FirebaseQueryAction.created, | |
payload: { key } | |
}); | |
} | |
}; | |
}; | |
const FirebaseQueriesReducer = ( | |
state = {}, | |
action) => { | |
switch(action.type) { | |
case FirebaseQueryAction.created: | |
case FirebaseQueryAction.snapshotReceived: | |
const { key } = action.payload; | |
return { | |
...state, | |
[key]: FirebaseQueryReducer(state[key], action) | |
}; | |
default: | |
return state; | |
} | |
} | |
const FirebaseQueryReducer = ( | |
state = { pending: true, items: [] }, | |
action) => { | |
switch(action.type) { | |
default: | |
case FirebaseQueryAction.created: | |
return state; | |
case FirebaseQueryAction.snapshotReceived: | |
const { querySnapshot } = action.payload; | |
const { items } = state; | |
querySnapshot.docChanges.forEach(change => { | |
switch (change.type) { | |
case 'added': | |
items.splice(change.newIndex, 0, change.doc.data()); | |
break; | |
case 'changed': | |
items.splice(change.oldIndex, 1); | |
items.splice(change.newIndex, 0, change.doc.data()); | |
break; | |
case 'removed': | |
items.splice(change.oldIndex, 1); | |
break; | |
} | |
}); | |
return { pending: false, items }; | |
} | |
} | |
export { | |
FirebaseQueryAction, | |
FirebaseQueriesReducer, | |
FirebaseQueryActionCreatorCache | |
}; |
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