ng-app: feat: add connecting status to store and add pulsing logo

ng-app/src/lib/FullLayout.svelte

@@ -19,11 +19,7 @@
   import { link, location } from "svelte-spa-router";
   import MobileBottomBarItem from "./MobileBottomBarItem.svelte";
   import MobileBottomBar from "./MobileBottomBar.svelte";
-  // @ts-ignore
+  import Logo from "./components/Logo.svelte";
-  import Logo from "../assets/nextgraph.svg?component";
-  // @ts-ignore
-  import LogoGray from "../assets/nextgraph-gray.svg?component";
-  import { online } from "../store";
 
   import { onMount, tick } from "svelte";
 
@@ -96,11 +92,7 @@
         <SidebarGroup ulClass="space-y-1 tall:space-y-2">
           <SidebarItem label="NextGraph" href="#/user" class="mt-1">
             <svelte:fragment slot="icon">
-              {#if $online}
+              <Logo className="w-7 h-7 tall:w-10 tall:h-10" />
-                <Logo class="w-7 h-7 tall:w-10 tall:h-10" />
-              {:else}
-                <LogoGray class="w-7 h-7 tall:w-10 tall:h-10" />
-              {/if}
             </svelte:fragment>
           </SidebarItem>
           <SidebarItem

ng-app/src/lib/Home.svelte

@@ -10,7 +10,6 @@
 -->
 
 <script lang="ts">
-  import { online } from "../store";
   import FullLayout from "./FullLayout.svelte";
   import Test from "./Test.svelte";
   import {
@@ -19,10 +18,7 @@
     ArrowRightOnRectangle,
     Users,
   } from "svelte-heros-v2";
-  // @ts-ignore
+  import Logo from "./components/Logo.svelte";
-  import Logo from "../assets/nextgraph.svg?component";
-  // @ts-ignore
-  import LogoGray from "../assets/nextgraph-gray.svg?component";
 
   let width: number;
   let breakPoint: number = 662;
@@ -43,11 +39,7 @@
         class="mx-auto flex flex-wrap justify-between items-center w-full px-2 xxs:px-8 xs:px-10"
       >
         <a href="#/user" class="flex items-center" on:click>
-          {#if $online}
           <Logo class="w-7 h-7 tall:w-10 tall:h-10" />
-          {:else}
-            <LogoGray class="w-7 h-7 tall:w-10 tall:h-10" />
-          {/if}
           <span
             class="ml-4 self-center text-lg font-normal text-gray-900 rounded-lg dark:text-white whitespace-nowrap"
             >NextGraph</span

ng-app/src/lib/components/Logo.svelte

@@ -0,0 +1,64 @@
+<!--
+// Copyright (c) 2022-2024 Niko Bonnieure, Par le Peuple, NextGraph.org developers
+// All rights reserved.
+// Licensed under the Apache License, Version 2.0
+// <LICENSE-APACHE2 or http://www.apache.org/licenses/LICENSE-2.0>
+// or the MIT license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
+// at your option. All files in the project carrying such
+// notice may not be copied, modified, or distributed except
+// according to those terms.
+-->
+
+<!--
+@component Logo
+The NextGraph Logo svg with color changing between blue and gray,
+depending on connection status:
+- connected: blue
+- connecting: pulse between blue and gray
+- disconnected: gray
+
+Provide classes using the `className` prop.
+-->
+
+<script lang="ts">
+  import { connection_status } from "../../store";
+  // @ts-ignore
+  import Logo from "../../assets/nextgraph.svg?component";
+
+  export let className: string = "";
+
+  // Color is adjusted to connection status.
+  let connection_status_class = ""; // Default is blue.
+  if ($connection_status === "connecting") {
+    connection_status_class = "logo-pulse";
+  } else if ($connection_status === "disconnected") {
+    connection_status_class = "logo-gray";
+  }
+</script>
+
+<Logo class={`${className} ${connection_status_class}`} />
+
+<!-- Sorry for the global but this way we can change the Logo's css from this component. -->
+<style global>
+  @keyframes pulse-logo-color {
+    0%,
+    100% {
+      /* Default colors come from the svg. */
+    }
+    50% {
+      /* Mid-transition color */
+      stroke: #888;
+      fill: #888;
+    }
+  }
+
+  .logo-pulse path {
+    animation: pulse-logo-color 2s infinite;
+    animation-timing-function: cubic-bezier(0.65, 0.01, 0.59, 0.83);
+  }
+
+  .logo-gray path {
+    fill: #888;
+    stroke: #888;
+  }
+</style>

ng-app/src/store.ts

@@ -7,7 +7,7 @@
 // notice may not be copied, modified, or distributed except
 // according to those terms.
 
-import { writable, readable, readonly, derived, get } from "svelte/store";
+import { writable, readable, readonly, derived, get, type Writable } from "svelte/store";
 import ng from "./api";
 
 let all_branches = {};
@@ -19,31 +19,58 @@ export const active_wallet = writable(undefined);
 
 export const wallets = writable({});
 
-export const connections = writable({});
+export const connections: Writable<Record<string, any>> = writable({});
 
 export const active_session = writable(undefined);
 
-let next_reconnect = null;
+export const connection_status: Writable<"disconnected" | "connected" | "connecting"> = writable("disconnected");
 
-export const online = derived(connections,($connections) => { 
+let next_reconnect: NodeJS.Timeout | null = null;
-    for (const cnx of Object.keys($connections)) {
+
-        if (!$connections[cnx].error) return true;
+const updateConnectionStatus = ($connections: Record<string, any> ) => {
-        else if ($connections[cnx].error=="PeerAlreadyConnected") { 
+    // Reset error state for PeerAlreadyConnected errors.
-            connections.update((c) => {
+    Object.entries($connections).forEach(([cnx, connection]) => {
+        if (connection.error === "PeerAlreadyConnected") {
+            connections.update(c => {
                 c[cnx].error = undefined;
                 return c;
             });
-            return true; }
+        }
-        else if ($connections[cnx].error=="ConnectionError" && !$connections[cnx].connecting && next_reconnect==null) {
+    });
+
+    // Check if any connection is active.
+    const is_connected = Object.values($connections).some(connection => !connection.error);
+
+    // Check if any connection is connecting.
+    const is_connecting = Object.values($connections).some(connection => connection.connecting);
+
+    // Check, if reconnect is needed.
+    const should_reconnect = !is_connecting && (next_reconnect === null) && Object.values($connections).some(
+        connection => connection.error === "ConnectionError"
+    );
+    if (should_reconnect) {
         console.log("will try reconnect in 20 sec");
-            next_reconnect = setTimeout(async ()=> {
+        next_reconnect = setTimeout(async () => {
             await reconnect();
-            },20000);
+            connection_status.set("connecting");
+            next_reconnect = null;
+        }, 20000);
     }
+
+    if (is_connected) {
+        connection_status.set("connected");
+    } else if (!is_connected && is_connecting) {
+        connection_status.set("connecting");
+    } else {
+        connection_status.set("disconnected");
     }
-    return false;
+};
+connections.subscribe(($connections) => {
+    updateConnectionStatus($connections);
 });
 
+export const online = derived(connection_status,($connectionStatus) => $connectionStatus == "connected");
+
 export const cannot_load_offline = writable(false);
 
 if (!get(online) && !import.meta.env.TAURI_PLATFORM) {
@@ -123,8 +150,6 @@ export const reconnect = async function() {
             get(active_session).user,
             location.href
         ));
-        
-        
     }catch (e) {
         console.error(e)
     }