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hydrogen-web/src/matrix/storage/idb/stores/TimelineFragmentStore.js

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import { StorageError } from "../../common.js";
import {Platform} from "../../../../Platform.js";
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import { encodeUint32 } from "../utils.js";
function encodeKey(roomId, fragmentId) {
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return `${roomId}|${encodeUint32(fragmentId)}`;
}
export class TimelineFragmentStore {
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constructor(store) {
this._store = store;
}
_allRange(roomId) {
try {
return IDBKeyRange.bound(
encodeKey(roomId, Platform.minStorageKey),
encodeKey(roomId, Platform.maxStorageKey)
);
} catch (err) {
throw new StorageError(`error from IDBKeyRange with roomId ${roomId}`, err);
}
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}
all(roomId) {
return this._store.selectAll(this._allRange(roomId));
}
/** Returns the fragment without a nextToken and without nextId,
if any, with the largest id if there are multiple (which should not happen) */
liveFragment(roomId) {
// why do we need this?
// Ok, take the case where you've got a /context fragment and a /sync fragment
// They are not connected. So, upon loading the persister, which one do we take? We can't sort them ...
// we assume that the one without a nextToken and without a nextId is a live one
// there should really be only one like this
// reverse because assuming live fragment has bigger id than non-live ones
return this._store.findReverse(this._allRange(roomId), fragment => {
return typeof fragment.nextId !== "number" && typeof fragment.nextToken !== "string";
});
}
// should generate an id an return it?
// depends if we want to do anything smart with fragment ids,
// like give them meaning depending on range. not for now probably ...
add(fragment) {
fragment.key = encodeKey(fragment.roomId, fragment.id);
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return this._store.add(fragment);
}
update(fragment) {
return this._store.put(fragment);
}
get(roomId, fragmentId) {
return this._store.get(encodeKey(roomId, fragmentId));
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}
}