add delete button in session picker

src/domain/BrawlViewModel.js

@@ -6,9 +6,9 @@ import SessionPickerViewModel from "./SessionPickerViewModel.js";
 import EventEmitter from "../EventEmitter.js";
 
 export default class BrawlViewModel extends EventEmitter {
-    constructor({createStorage, sessionStore, createHsApi, clock}) {
+    constructor({storageFactory, sessionStore, createHsApi, clock}) {
         super();
-        this._createStorage = createStorage;
+        this._storageFactory = storageFactory;
         this._sessionStore = sessionStore;
         this._createHsApi = createHsApi;
         this._clock = clock;
@@ -32,6 +32,7 @@ export default class BrawlViewModel extends EventEmitter {
         this._clearSections();
         this._sessionPickerViewModel = new SessionPickerViewModel({
             sessionStore: this._sessionStore,
+            storageFactory: this._storageFactory,
             sessionCallback: sessionInfo => this._onSessionPicked(sessionInfo)
         });
         this.emit("change", "activeSection");
@@ -122,7 +123,7 @@ export default class BrawlViewModel extends EventEmitter {
             this._loading = true;
             this._loadingText = "Loading your conversations…";
             const hsApi = this._createHsApi(sessionInfo.homeServer, sessionInfo.accessToken);
-            const storage = await this._createStorage(sessionInfo.id);
+            const storage = await this._storageFactory.create(sessionInfo.id);
             // no need to pass access token to session
             const filteredSessionInfo = {
                 deviceId: sessionInfo.deviceId,

src/domain/SessionPickerViewModel.js

@@ -1,7 +1,54 @@
 import {SortedArray} from "../observable/index.js";
+import EventEmitter from "../EventEmitter.js";
+
+class SessionItemViewModel extends EventEmitter {
+    constructor(sessionInfo, pickerVM) {
+        super();
+        this._pickerVM = pickerVM;
+        this._sessionInfo = sessionInfo;
+        this._isDeleting = false;
+        this._error = null;
+    }
+
+    get error() {
+        return this._error && this._error.message;
+    }
+
+    async delete() {
+        this._isDeleting = true;
+        this.emit("change", "isDeleting");
+        try {
+            await this._pickerVM.delete(this.id);
+        } catch(err) {
+            this._error = err;
+            console.error(err);
+            this.emit("change", "error");
+        } finally {
+            this._isDeleting = false;
+            this.emit("change", "isDeleting");
+        }
+    }
+
+    get isDeleting() {
+        return this._isDeleting;
+    }
+
+    get id() {
+        return this._sessionInfo.id;
+    }
+
+    get userId() {
+        return this._sessionInfo.userId;
+    }
+    
+    get lastUsed() {
+        return this._sessionInfo.lastUsed;
+    }
+}
 
 export default class SessionPickerViewModel {
-    constructor({sessionStore, sessionCallback}) {
+    constructor({storageFactory, sessionStore, sessionCallback}) {
+        this._storageFactory = storageFactory;
         this._sessionStore = sessionStore;
         this._sessionCallback = sessionCallback;
         this._sessions = new SortedArray((s1, s2) => (s1.lastUsed || 0) - (s2.lastUsed || 0));
@@ -9,7 +56,7 @@ export default class SessionPickerViewModel {
 
     async load() {
         const sessions = await this._sessionStore.getAll();
-        this._sessions.setManyUnsorted(sessions);
+        this._sessions.setManyUnsorted(sessions.map(s => new SessionItemViewModel(s, this)));
     }
 
     pick(id) {
@@ -19,6 +66,13 @@ export default class SessionPickerViewModel {
         }
     }
 
+    async delete(id) {
+        const idx = this._sessions.array.findIndex(s => s.id === id);
+        await this._sessionStore.delete(id);
+        await this._storageFactory.delete(id);
+        this._sessions.remove(idx);
+    }
+
     get sessions() {
         return this._sessions;
     }

src/main.js

@@ -1,5 +1,5 @@
 import HomeServerApi from "./matrix/hs-api.js";
-import createIdbStorage from "./matrix/storage/idb/create.js";
+import StorageFactory from "./matrix/storage/idb/create.js";
 import SessionsStore from "./matrix/sessions-store/localstorage/SessionsStore.js";
 import BrawlViewModel from "./domain/BrawlViewModel.js";
 import BrawlView from "./ui/web/BrawlView.js";
@@ -7,7 +7,7 @@ import BrawlView from "./ui/web/BrawlView.js";
 export default async function main(container) {
     try {
         const vm = new BrawlViewModel({
-            createStorage: sessionId => createIdbStorage(`brawl_session_${sessionId}`),
+            storageFactory: new StorageFactory(),
             createHsApi: (homeServer, accessToken = null) => new HomeServerApi(homeServer, accessToken),
             sessionStore: new SessionsStore("brawl_sessions_v1"),
             clock: Date //just for `now` fn

src/matrix/sessions-store/localstorage/SessionsStore.js

@@ -42,4 +42,11 @@ export default class SessionsStore {
         sessions.push(sessionInfo);
         localStorage.setItem(this._name, JSON.stringify(sessions));
     }
+
+    async delete(sessionId) {
+        let sessions = await this.getAll();
+        sessions = sessions.filter(s => s.id !== sessionId);
+        localStorage.setItem(this._name, JSON.stringify(sessions));
+    }
+    
 }

src/matrix/storage/idb/create.js

@@ -1,9 +1,18 @@
 import Storage from "./storage.js";
-import { openDatabase } from "./utils.js";
+import { openDatabase, reqAsPromise } from "./utils.js";
 
-export default async function createIdbStorage(databaseName) {
+export default class StorageFactory {
+    async create(sessionId) {
+        const databaseName = `brawl_session_${sessionId}`;
         const db = await openDatabase(databaseName, createStores, 1);
         return new Storage(db);
+    }
+
+    delete(sessionId) {
+        const databaseName = `brawl_session_${sessionId}`;
+        const req = window.indexedDB.deleteDatabase(databaseName);
+        return reqAsPromise(req);
+    }
 }
 
 function createStores(db) {

src/ui/web/css/main.css

@@ -42,6 +42,15 @@ body {
   background-color: grey;
   padding: 0.5em;
   cursor: pointer;
+  display: flex;
+}
+
+.SessionPickerView li span.userId {
+  flex: 1;
+}
+
+.SessionPickerView li span.error {
+  margin: 0 20px;
 }
 
 .LoginView {

src/ui/web/general/TemplateView.js

@@ -32,6 +32,8 @@ export default class TemplateView {
     }
 
     update(value, prop) {
+        if (this._template) {
             this._template.update(value);
         }
+    }
 }

src/ui/web/login/SessionPickerView.js

@@ -2,8 +2,25 @@ import ListView from "../general/ListView.js";
 import TemplateView from "../general/TemplateView.js";
 
 class SessionPickerItem extends TemplateView {
+    constructor(vm) {
+        super(vm, true);
+        this._onDeleteClick = this._onDeleteClick.bind(this);
+    }
+
+    _onDeleteClick(event) {
+        event.stopPropagation();
+        event.preventDefault();
+        this.viewModel.delete();
+    }
+
     render(t) {
-        return t.li([vm => vm.userId]);
+        const deleteButton = t.button({
+            disabled: vm => vm.isDeleting,
+            onClick: event => this._onDeleteClick(event)
+        }, "Delete");
+        const userName = t.span({className: "userId"}, vm => vm.userId);
+        const errorMessage = t.if(vm => vm.error, t => t.span({className: "error"}, vm => vm.error));
+        return t.li([userName, errorMessage, deleteButton]);
     }
 }