Randomized track tests succeeding for the first time. Added comments.

.vscode/launch.json

@@ -9,7 +9,8 @@
             "request": "launch",
             "name": "Jasmine Tests with SQLite",
             "env": {
-                "MUDBASE_DB_CONFIG": "{\"client\": \"sqlite3\", \"connection\": \":memory:\"}"
+                "MUDBASE_DB_CONFIG": "{\"client\": \"sqlite3\", \"connection\": \":memory:\"}",
+                "TEST_RANDOM_SEED": "0.70810"
             },
             "program": "${workspaceFolder}/server/node_modules/jasmine-ts/lib/index",
             "args": [

client/src/api/endpoints/data.ts

@@ -23,7 +23,13 @@ export type DBExportResponse = DBDataFormat;
 // Fully replace the user's database by an import (POST).
 export const DBImportEndpoint = "/import";
 export type DBImportRequest = DBDataFormat;
-export type DBImportResponse = void;
+export interface IDMappings {
+    tracks: Record<number, number>,
+    albums: Record<number, number>,
+    artists: Record<number, number>,
+    tags: Record<number, number>,
+}
+export type DBImportResponse = IDMappings; // Returns the IDs mapped during import.
 export const checkDBImportRequest: (v: any) => boolean = (v: any) => {
     return 'tracks' in v &&
         'albums' in v &&

server/db/Data.ts

@@ -1,5 +1,5 @@
 import Knex from "knex";
-import { TrackWithRefsWithId, AlbumWithRefsWithId, ArtistWithRefsWithId, TagWithRefsWithId, TrackWithRefs, AlbumBaseWithRefs } from "../../client/src/api/api";
+import { TrackWithRefsWithId, AlbumWithRefsWithId, ArtistWithRefsWithId, TagWithRefsWithId, TrackWithRefs, AlbumBaseWithRefs, DBImportResponse, IDMappings } from "../../client/src/api/api";
 import * as api from '../../client/src/api/api';
 import asJson from "../lib/asJson";
 import { createArtist } from "./Artist";
@@ -155,44 +155,48 @@ export async function exportDB(userId: number, knex: Knex): Promise<api.DBDataFo
     }
 }
 
-export async function importDB(userId: number, db: api.DBDataFormat, knex: Knex): Promise<void> {
+export async function importDB(userId: number, db: api.DBDataFormat, knex: Knex): Promise<DBImportResponse> {
     // Store the ID mappings in this record.
-    let tagIdMaps: Record<number, number> = {}; // Maps import ID to db ID
+    let maps: IDMappings = {
-    let artistIdMaps: Record<number, number> = {};  // Maps import ID to db ID
+        tracks: {},
-    let albumIdMaps: Record<number, number> = {};  // Maps import ID to db ID
+        artists: {},
-    let trackIdMaps: Record<number, number> = {};  // Maps import ID to db ID
+        albums: {},
+        tags: {},
+    }
     // Insert items one by one, remapping the IDs as we go.
     for(const tag of db.tags) {
         let _tag = {
             ..._.omit(tag, 'id'),
-            parentId: tag.parentId ? tagIdMaps[tag.parentId] : null,
+            parentId: tag.parentId ? maps.tags[tag.parentId] : null,
         }
-        tagIdMaps[tag.id] = await createTag(userId, _tag, knex);
+        maps.tags[tag.id] = await createTag(userId, _tag, knex);
     }
     for(const artist of db.artists) {
-        artistIdMaps[artist.id] = await createArtist(userId, {
+        maps.artists[artist.id] = await createArtist(userId, {
             ..._.omit(artist, 'id'),
-            tagIds: artist.tagIds.map((id: number) => tagIdMaps[id]),
+            tagIds: artist.tagIds.map((id: number) => maps.tags[id]),
             trackIds: [],
             albumIds: [],
         }, knex);
     }
     for(const album of db.albums) {
-        albumIdMaps[album.id] = await createAlbum(userId, {
+        maps.albums[album.id] = await createAlbum(userId, {
             ..._.omit(album, 'id'),
-            tagIds: album.tagIds.map((id: number) => tagIdMaps[id]),
+            tagIds: album.tagIds.map((id: number) => maps.tags[id]),
-            artistIds: album.artistIds.map((id: number) => artistIdMaps[id]),
+            artistIds: album.artistIds.map((id: number) => maps.artists[id]),
             trackIds: [],
         }, knex);
     }
     for(const track of db.tracks) {
-        trackIdMaps[track.id] = await createTrack(userId, {
+        maps.tracks[track.id] = await createTrack(userId, {
             ..._.omit(track, 'id'),
-            tagIds: track.tagIds.map((id: number) => tagIdMaps[id]),
+            tagIds: track.tagIds.map((id: number) => maps.tags[id]),
-            artistIds: track.artistIds.map((id: number) => artistIdMaps[id]),
+            artistIds: track.artistIds.map((id: number) => maps.artists[id]),
-            albumId: track.albumId ? albumIdMaps[track.albumId] : null,
+            albumId: track.albumId ? maps.albums[track.albumId] : null,
         }, knex);
     }
+
+    return maps;
 }
 
 export async function wipeDB(userId: number, knex: Knex) {

server/db/Track.ts

@@ -276,6 +276,12 @@ export async function modifyTrack(userId: number, trackId: number, track: TrackB
 
 export async function deleteTrack(userId: number, trackId: number, knex: Knex): Promise<void> {
     await knex.transaction(async (trx) => {
+        // FIXME remove
+
+        let tracks = await trx.select('id', 'name')
+        .from('tracks');
+        console.log("All tracks:", tracks);
+
         // Start by retrieving the track itself for sanity.
         const confirmTrackId: number | undefined =
             await trx.select('id')

server/endpoints/Data.ts

@@ -31,8 +31,8 @@ export const DBImport: EndpointHandler = async (req: any, res: any, knex: Knex)
     console.log("User ", userId, ": Import DB ");
 
     try {
-        await importDB(userId, reqObject, knex)
+        let mappings = await importDB(userId, reqObject, knex)
-        res.status(200).send();
+        res.status(200).send(mappings);
 
     } catch (e) {
         handleErrorsInEndpoint(e);

server/test/integration/flows/ResourceFlow.ts

@@ -7,7 +7,7 @@ import { ReferenceDatabase } from '../../reference_model/DBReferenceModel';
 import { randomDBAction, RandomDBActionDistribution, DBActionType, applyReferenceDBAction, applyRealDBAction, DBAction } from '../../reference_model/randomGen';
 import * as helpers from '../helpers';
 import seedrandom from 'seedrandom';
-import { AlbumWithRefsWithId, Artist, ArtistWithRefsWithId, TagWithRefsWithId, TrackWithRefs, TrackWithRefsWithId } from '../../../../client/src/api/api';
+import { AlbumWithRefsWithId, Artist, ArtistWithRefsWithId, DBImportResponse, IDMappings, TagWithRefsWithId, TrackWithRefs, TrackWithRefsWithId } from '../../../../client/src/api/api';
 import sampleDB from '../sampleDB';
 let stringify = require('json-stringify-deterministic');
 
@@ -69,7 +69,7 @@ function normalizeDB(oldDb: ReferenceDatabase) {
     }
     for (const userId in db) {
         // First remap the IDs only, ignoring references
-        db[userId].tracks.forEach((x: TrackWithRefsWithId) => { console.log("X:", x); x.id = remapId(x.id, trackMap); });
+        db[userId].tracks.forEach((x: TrackWithRefsWithId) => { x.id = remapId(x.id, trackMap); });
         db[userId].albums.forEach((x: AlbumWithRefsWithId) => { x.id = remapId(x.id, albumMap); })
         db[userId].artists.forEach((x: ArtistWithRefsWithId) => { x.id = remapId(x.id, artistMap); })
         db[userId].tags.forEach((x: TagWithRefsWithId) => { x.id = remapId(x.id, tagMap); })
@@ -99,16 +99,61 @@ function normalizeDB(oldDb: ReferenceDatabase) {
     return db;
 }
 
+// Transform all referenced IDs in an action given a mapping.
+function transformActionIDs(action: DBAction, mappings: IDMappings, rng: any) {
+    let r: DBAction = _.cloneDeep(action);
+
+    let doMap = (id: number, mapping: Record<number, number>) => {
+        if (id in mapping) {
+            return mapping[id];
+        }
+        // Number is not in the map. Generate something that will be nonexistent
+        // for sure.
+        let highest = 0;
+        for (const [_, value] of Object.entries(mapping)) {
+            highest = Math.max(value, highest);
+        }
+        return highest + 1 + Math.floor(rng() * 100);
+    }
+
+    switch (r.type) {
+        case DBActionType.CreateTrack: {
+            let track = r.payload as TrackWithRefsWithId;
+            track.tagIds.forEach((id: number) => doMap(id, mappings.tags));
+            track.artistIds.forEach((id: number) => doMap(id, mappings.artists));
+            track.albumId = track.albumId ? doMap(track.albumId, mappings.albums) : null;
+            break;
+        }
+        case DBActionType.DeleteTrack: {
+            r.payload = mappings.tracks[r.payload];
+            break;
+        }
+    }
+    return r;
+}
+
+
+// This test is designed to find corner-cases in the back-end API implementation.
+// Operations are performed on the API while also being performed on a simplified
+// reference model.
+// The database is compared after each operation by exporting it through the export
+// endpoint.
+// This way, the import, export and resource operations are all thoroughly tested
+// in a random way, assuming that the reference model is the "gold standard".
 describe('Randomized model-based DB back-end tests', () => {
     it('all succeed', async done => {
+        // Get a handle to perform API requests.
         let req = await init();
+
+        // Keep a trace of the actions that have been performed, for debugging purposes.
         let actionTrace: DBAction[] = [];
 
+        // Seed the random number generator so that the test run can be reproduced.
         let seed: string = process.env.TEST_RANDOM_SEED || Math.random().toFixed(5).toString();
         console.log(`Test random seed: '${seed}'`)
 
         try {
-            // Create a reference DB
+            // Create a reference DB.
             let refDB: ReferenceDatabase = _.cloneDeep(sampleDB);
 
             // Prime the real DB
@@ -116,7 +161,13 @@ describe('Randomized model-based DB back-end tests', () => {
             await helpers.createUser(req, "someone@email.com", "password1A!", 200);
             await helpers.login(req, "someone@email.com", "password1A!", 200);
             // Import the starting DB.
-            await helpers.importDB(req, refDB[1]);
+            let importResponse: DBImportResponse = (await helpers.importDB(req, refDB[1])).body;
+
+            // As we perform operations, the real DB and reference model may assign
+            // different new IDs to new objects. We need to maintain mappings in order
+            // to keep the operations consistent (e.g. when we make references to)
+            // existing objects along the way.
+            let idMappingsRefToReal: IDMappings = importResponse;
 
             // Check that we are starting from an equal situation
             let refState = normalizeDB(refDB);
@@ -125,8 +176,11 @@ describe('Randomized model-based DB back-end tests', () => {
             });
             expect(realState).to.deep.equal(refState);
 
-            // Start doing some random changes, checking the state after each step.
+            // Create a random number generator to use throughout the test.
             let rng = seedrandom(seed);
+
+            // This distribution determines the kind of random actions that will
+            // be generated.
             let dist: RandomDBActionDistribution = {
                 type: new Map([
                     [DBActionType.CreateTrack, 0.7],
@@ -149,20 +203,35 @@ describe('Randomized model-based DB back-end tests', () => {
                 }
             }
 
-            for (let i = 0; i < 30; i++) {
+            // Loop to generate and execute a bunch of random actions.
-                let action = randomDBAction(
+            for (let i = 0; i < 100; i++) {
+
+                // Generate an action (based on the reference DB)
+                let refAction = randomDBAction(
                     refDB,
                     rng,
                     dist
                 );
-                actionTrace.push(action);
+                actionTrace.push(refAction);
-                console.log("Testing action: ", action);
+                console.log("Testing action: ", refAction);
-                let { response: refResponse, status: refStatus } = applyReferenceDBAction(action, refDB);
+
-                let { response: realResponse, status: realStatus } = await applyRealDBAction(action, req);
+                // Transform any referenced IDs using the ID mapping
+                let realAction = transformActionIDs(refAction, idMappingsRefToReal, rng);
+
+                // Apply the action to the real and reference DB.
+                let { response: refResponse, status: refStatus } = applyReferenceDBAction(refAction, refDB);
+                let { response: realResponse, status: realStatus } = await applyRealDBAction(realAction, req);
+
+                // If this was an object creation action, we need to update the mappings.
+                if (refAction.type === DBActionType.CreateTrack) {
+                    let refId = refResponse.id;
+                    let realId = realResponse.id;
+                    idMappingsRefToReal.tracks[refId] = realId;
+                }
 
                 // Compare the response and status.
-                expect(normalizeResponse(realResponse)).to.deep.equal(normalizeResponse(refResponse));
                 expect(realStatus).to.equal(refStatus);
+                expect(normalizeResponse(realResponse)).to.deep.equal(normalizeResponse(refResponse));
 
                 // Compare the database state after the action.
                 let refState = normalizeDB(refDB);
@@ -191,7 +260,8 @@ describe('Randomized model-based DB back-end tests', () => {
                     + `  actual: ${e.actualDump}\n`
                     + `  expected: ${e.expectedDump}\n`
                     + `  DB action trace: ${e.actionTraceDump}\n`
-                    + `  Starting DB: ${e.startingDBDump}`
+                    + `  Starting DB: ${e.startingDBDump}\n`
+                    + `  TEST_RANDOM_SEED: ${seed}`
                 );
             }
             throw e;

server/test/integration/helpers.ts

@@ -1,5 +1,5 @@
 import { sha512 } from "js-sha512";
-import { DBDataFormat, IntegrationImpl } from "../../../client/src/api/api";
+import { DBDataFormat, DBImportResponse, IntegrationImpl } from "../../../client/src/api/api";
 import { ReferenceDatabase } from "../reference_model/DBReferenceModel";
 
 let chai = require('chai');

server/test/reference_model/DBReferenceModel.ts

@@ -34,8 +34,10 @@ function ensureInSet(n: number, s: number[]) {
 function ensureLinked(fromObjects: number[], fromObjectsType: ObjectsType,
     toId: number, toObjectsType: ObjectsType, data: DBDataFormat) {
     if (toObjectsType === 'tracks') {
-        fromObjects.forEach((fromId: number) => ensureInSet(toId, 
+        fromObjects.forEach((fromId: number) => {
-            (data[fromObjectsType][fromId] as AlbumWithRefsWithId | ArtistWithRefsWithId).trackIds))
+            let fromObject = (data[fromObjectsType] as any).find((o: any) => o.id === fromId);
+            ensureInSet(toId, (fromObject as AlbumWithRefsWithId | ArtistWithRefsWithId).trackIds)
+        })
     }
 }
 

server/test/reference_model/randomGen.ts

@@ -90,10 +90,12 @@ export function applyReferenceDBAction(
     let response: any = undefined;
     let status: number = 0;
 
+    console.log('ref action:', action);
     try {
         switch (action.type) {
             case DBActionType.CreateTrack: {
                 response = createTrack(action.userId, action.payload, db);
+                console.log("create track ref response", response)
                 status = 200;
                 break;
             }
@@ -110,6 +112,8 @@ export function applyReferenceDBAction(
                 status = 404;
                 response = {};
             }
+        } else {
+            throw e;
         }
     }
 
@@ -175,8 +179,8 @@ export function randomDBAction(
             return {
                 type: type,
                 payload: applyDistribution(distribution.deleteTrackParams.validTrack, randomNumGen) ?
-                    Math.floor(Math.random() * db[userId].tracks.length) + 1 :
+                    Math.floor(randomNumGen() * db[userId].tracks.length) + 1 :
-                    Math.floor(Math.random() * db[userId].tracks.length) + 1 + db[userId].tracks.length,
+                    Math.floor(randomNumGen() * db[userId].tracks.length) + 1 + db[userId].tracks.length,
                 userId: userId,
             }
         }
@@ -200,7 +204,7 @@ export function createRandomTrack(
         let validArtists: number[] = pickNFromArray(allValidArtistIds, randomNumGen, applyDistribution(trackDist.linkArtists.numValid, randomNumGen));
         let invalidArtists: number[] = [];
         for (let i = 0; i < applyDistribution(trackDist.linkArtists.numInvalid, randomNumGen); i++) {
-            invalidArtists.push(Math.round(Math.random() * 100) + allValidArtistIds.length);
+            invalidArtists.push(Math.round(randomNumGen() * 100) + allValidArtistIds.length);
         }
         return [...validArtists, ...invalidArtists];
     })();
@@ -209,7 +213,7 @@ export function createRandomTrack(
         let validTags: number[] = pickNFromArray(allValidTagIds, randomNumGen, applyDistribution(trackDist.linkTags.numValid, randomNumGen));
         let invalidTags: number[] = [];
         for (let i = 0; i < applyDistribution(trackDist.linkTags.numInvalid, randomNumGen); i++) {
-            invalidTags.push(Math.round(Math.random() * 100) + allValidTagIds.length);
+            invalidTags.push(Math.round(randomNumGen() * 100) + allValidTagIds.length);
         }
         return [...validTags, ...invalidTags];
     })();