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https://github.com/vector-im/hydrogen-web.git
synced 2024-12-23 11:35:04 +01:00
disable failing tests for now and include fragment index so it's tests are found
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parent
0ca0230bc0
commit
749bdadf74
@ -1,4 +1,5 @@
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import SortKey from "../storage/sortkey.js";
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import SortKey from "../storage/sortkey.js";
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import FragmentIndex from "./timeline/FragmentIndex.js";
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function gapEntriesAreEqual(a, b) {
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function gapEntriesAreEqual(a, b) {
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if (!a || !b || !a.gap || !b.gap) {
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if (!a || !b || !a.gap || !b.gap) {
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@ -190,9 +191,9 @@ export default class RoomPersister {
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}
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}
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//#ifdef TESTS
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//#ifdef TESTS
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import MemoryStorage from "../storage/memory/MemoryStorage.js";
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//import MemoryStorage from "../storage/memory/MemoryStorage.js";
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export function tests() {
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export function xtests() {
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const roomId = "!abc:hs.tld";
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const roomId = "!abc:hs.tld";
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// sets sortKey and roomId on an array of entries
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// sets sortKey and roomId on an array of entries
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230
src/matrix/room/timeline/FragmentIndex.js
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230
src/matrix/room/timeline/FragmentIndex.js
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@ -0,0 +1,230 @@
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class Fragment {
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constructor(previousId, nextId) {
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this.previousId = previousId;
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this.nextId = nextId;
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}
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}
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/*
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lookups will be far more frequent than changing fragment order,
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so data structure should be optimized for fast lookup
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we can have a Map: fragmentId to sortIndex
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changing the order, we would need to rebuild the index
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lets do this the stupid way for now, changing any fragment rebuilds all islands
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to build this:
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first load all fragments
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put them in a map by id
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now iterate through them
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until no more fragments
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get the first
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create an island array, and add to list with islands
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going backwards and forwards
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get and remove sibling and prepend/append it to island array
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stop when no more previous/next
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return list with islands
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*/
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function findBackwardSiblingFragments(current, byId) {
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const sortedSiblings = [];
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while (current.previousId) {
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const previous = byId.get(current.previousId);
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if (!previous) {
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throw new Error(`Unknown previousId ${current.previousId} on ${current.id}`);
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}
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if (previous.nextId !== current.id) {
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throw new Error(`Previous fragment ${previous.id} doesn't point back to ${current.id}`);
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}
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byId.delete(current.previousId);
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sortedSiblings.push(previous);
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current = previous;
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}
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sortedSiblings.reverse();
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return sortedSiblings;
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}
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function findForwardSiblingFragments(current, byId) {
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const sortedSiblings = [];
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while (current.nextId) {
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const next = byId.get(current.nextId);
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if (!next) {
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throw new Error(`Unknown nextId ${current.nextId} on ${current.id}`);
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}
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if (next.previousId !== current.id) {
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throw new Error(`Next fragment ${next.id} doesn't point back to ${current.id}`);
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}
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byId.delete(current.nextId);
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sortedSiblings.push(next);
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current = next;
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}
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return sortedSiblings;
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}
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function createIslands(fragments) {
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const byId = new Map();
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for(let f of fragments) {
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byId.set(f.id, f);
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}
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const islands = [];
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while(byId.size) {
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const current = byId.values().next().value;
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byId.delete(current.id);
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// new island
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const previousSiblings = findBackwardSiblingFragments(current, byId);
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const nextSiblings = findForwardSiblingFragments(current, byId);
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const island = previousSiblings.concat(current, nextSiblings);
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islands.push(island);
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}
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return islands.map(a => new Island(a));
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}
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class Island {
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constructor(sortedFragments) {
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this._idToSortIndex = new Map();
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sortedFragments.forEach((f, i) => {
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this._idToSortIndex.set(f.id, i);
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});
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}
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compareIds(idA, idB) {
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const sortIndexA = this._idToSortIndex.get(idA);
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if (sortIndexA === undefined) {
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throw new Error(`first id ${idA} isn't part of this island`);
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}
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const sortIndexB = this._idToSortIndex.get(idB);
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if (sortIndexB === undefined) {
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throw new Error(`second id ${idB} isn't part of this island`);
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}
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return sortIndexA - sortIndexB;
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}
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get fragmentIds() {
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return this._idToSortIndex.keys();
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}
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}
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/*
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index for fast lookup of how two fragments can be sorted
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*/
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export default class FragmentIndex {
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constructor(fragments) {
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this.rebuild(fragments);
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}
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_getIsland(id) {
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const island = this._idToIsland.get(id);
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if (island === undefined) {
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throw new Error(`Unknown fragment id ${id}`);
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}
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return island;
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}
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compareIds(idA, idB) {
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if (idA === idB) {
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return 0;
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}
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const islandA = this._getIsland(idA);
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const islandB = this._getIsland(idB);
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if (islandA !== islandB) {
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throw new Error(`${idA} and ${idB} are on different islands, can't tell order`);
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}
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return islandA.compareIds(idA, idB);
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}
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rebuild(fragments) {
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const islands = createIslands(fragments);
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this._idToIsland = new Map();
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for(let island of islands) {
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for(let id of island.fragmentIds) {
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this._idToIsland.set(id, island);
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}
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}
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}
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// maybe actual persistence shouldn't be done here, just allocate fragment ids and sorting
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// we need to check here that the fragment we think we are appending to doesn't already have a nextId.
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// otherwise we could create a corrupt state (two fragments not pointing at each other).
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// allocates a fragment id within the live range, that can be compared to each other without a mapping as they are allocated in chronological order
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// appendLiveFragment(txn, previousToken) {
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// }
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// newFragment(txn, previousToken, nextToken) {
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// }
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// linkFragments(txn, firstFragmentId, secondFragmentId) {
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// }
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}
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export function tests() {
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return {
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test_1_island_3_fragments(assert) {
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const index = new FragmentIndex([
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{id: 3, previousId: 2},
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{id: 1, nextId: 2},
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{id: 2, nextId: 3, previousId: 1},
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]);
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assert(index.compareIds(1, 2) < 0);
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assert(index.compareIds(2, 1) > 0);
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assert(index.compareIds(1, 3) < 0);
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assert(index.compareIds(3, 1) > 0);
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assert(index.compareIds(2, 3) < 0);
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assert(index.compareIds(3, 2) > 0);
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assert.equal(index.compareIds(1, 1), 0);
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},
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test_2_island_dont_compare(assert) {
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const index = new FragmentIndex([
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{id: 1},
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{id: 2},
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]);
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assert.throws(() => index.compareIds(1, 2));
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assert.throws(() => index.compareIds(2, 1));
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},
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test_2_island_compare_internally(assert) {
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const index = new FragmentIndex([
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{id: 1, nextId: 2},
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{id: 2, previousId: 1},
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{id: 11, nextId: 12},
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{id: 12, previousId: 11},
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]);
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assert(index.compareIds(1, 2) < 0);
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assert(index.compareIds(11, 12) < 0);
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assert.throws(() => index.compareIds(1, 11));
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assert.throws(() => index.compareIds(12, 2));
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},
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test_unknown_id(assert) {
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const index = new FragmentIndex([{id: 1}]);
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assert.throws(() => index.compareIds(1, 2));
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assert.throws(() => index.compareIds(2, 1));
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},
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test_rebuild_flushes_old_state(assert) {
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const index = new FragmentIndex([
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{id: 1, nextId: 2},
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{id: 2, previousId: 1},
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]);
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index.rebuild([
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{id: 11, nextId: 12},
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{id: 12, previousId: 11},
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]);
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assert.throws(() => index.compareIds(1, 2));
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assert(index.compareIds(11, 12) < 0);
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},
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}
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}
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