More re-org.

Try to move message searching implementation into separate .js file.
Have apiFetch() put errors into state, as appropriate.
Add errorDetails display.

src/lib/QueryInput.svelte

@@ -18,10 +18,11 @@
             Allow JavaScript to mutate objects
             <input type=checkbox bind:checked={mutableObjects}>
         </div>
-        <textarea class={"query-input" + (big ? ' big' : '')} bind:value={queryCode}></textarea>
+        <textarea class={'query-input' + (big ? ' big' : '')} bind:value={queryCode}></textarea>
     </div>
 {/if}
 
+<!--suppress CssUnusedSymbol -->
 <style>
 .query-input-header {
   display: flex;

src/lib/state.js

@@ -41,10 +41,12 @@ export const state = writable({
   itemCount: undefined,
   matchCount: undefined,
   error: 'Connecting to WebSocket...',
+  errorDetails: undefined,
 })
 
 const updateClearError = updater => state.update(s => {
   s.error = null
+  s.errorDetails = null
   return updater(s)
 })
 
@@ -129,6 +131,9 @@ export const query = async ({ cluster, topic, mode, jsFilter, queryCode, maxItem
 }
 
 export const connect = () => {
+  if (ws?.readyState === WebSocket.OPEN) {
+    return;
+  }
   if (testMode) {
     updateClearError(s => ({ ...s, error: 'TEST MODE ENABLED' }))
     return

src/routes/+page.js

@@ -1 +1,65 @@
-export const prerender = true;
+import { apiFetch } from "../utils.js";
+import { killQuery, query } from "../lib/state.js";
+
+export const getTopics = async cluster =>
+  (await apiFetch(`/topics/${cluster}`) || []).sort()
+
+export const mapFromLocalStorage = ({ checked, querySettings, jsonDisplay, clusterNames, topics }) => {
+  if (localStorage.querySettings) {
+    let storedSettings
+    try {
+      storedSettings = JSON.parse(localStorage.querySettings)
+    } catch (e) {
+      storedSettings = {}
+    }
+
+    querySettings.maxItems = storedSettings?.maxItems ?? querySettings.maxItems
+    querySettings.jsFilter = storedSettings?.jsFilter ?? querySettings.jsFilter
+    querySettings.queryCode = storedSettings?.queryCode ?? querySettings.queryCode
+    querySettings.mode = storedSettings?.mode ?? querySettings.mode
+
+    if (!checked || clusterNames.includes(storedSettings?.cluster)) {
+      querySettings.cluster = storedSettings.cluster
+    } else {
+      querySettings.cluster = clusterNames[0]
+    }
+
+    if (!checked || topics.includes(storedSettings?.topic)) {
+      querySettings.topic = storedSettings.topic
+    } else {
+      querySettings.topic = topics[0]
+    }
+  }
+
+  if (localStorage.jsonDisplay) {
+    try {
+      const savedJsonDisplay = JSON.parse(localStorage.jsonDisplay)
+      Object.entries(savedJsonDisplay).forEach(([key, value]) => {
+        if (savedJsonDisplay[key] !== undefined) {
+          jsonDisplay[key] = value
+        }
+      })
+    } catch (e) {
+    }
+  }
+}
+
+export const getClusterNames = async () => Object.keys((await apiFetch('/clusters')) || {})
+
+export const startQuery = querySettings => {
+  localStorage.setItem('querySettings', JSON.stringify(querySettings))
+  query(querySettings)
+  return true
+}
+
+export const stopQuery = querySettings => {
+  killQuery(querySettings)
+  return false
+}
+export const defaultQueryCode =
+`// \`message\` contains all metadata
+// \`value\` is shorthand for message.value
+//    it contains the actual produced data
+// \`json\` is a JSON representation of \`message\`
+
+return message.value.eventType === "Television";`

src/routes/+page.svelte

@@ -2,92 +2,86 @@
 	import { onMount } from 'svelte'
 	import { JsonView } from '@zerodevx/svelte-json-view'
 	import QueryInput from '$lib/QueryInput.svelte'
-	import { state, connect, query, killQuery } from '$lib/state'
+	import { state, connect } from '$lib/state'
-	import { queryMode } from "../lib/constants.js"
+	import { queryMode } from '../lib/constants.js'
-	import { apiFetch } from "../utils.js"
+	import Modal from '../lib/Modal.svelte';
-	import Modal from "../lib/Modal.svelte";
+	import {
+		defaultQueryCode,
+		getClusterNames,
+		getTopics,
+		mapFromLocalStorage,
+		startQuery,
+		stopQuery
+	} from './+page.js';
 
 	let showQueryModal = false
+	let queryRunning = false
 
-	let expandAll = true
+	const fontSizes = [30, 50, 67, 80, 90, 100, 110, 120, 133, 150]
-	let showMetadata = true
+	let jsonDisplay = {
+		expandAll: true,
+		showMetadata: true,
+		fontSize: fontSizes.indexOf(100),
+		fontUp: () => setFontSize(Math.min(jsonDisplay.fontSize + 1, fontSizes.length - 1)),
+		fontDown: () => setFontSize(Math.max(jsonDisplay.fontSize - 1, 0))
+	}
+	const setFontSize = size => {
+		jsonDisplay.fontSize = size
+		localStorage.jsonDisplay = JSON.stringify(jsonDisplay)
+	}
 
-	const querySettings = {
+	let querySettings = {
 		topic: null,
 		cluster: null,
 		mode: queryMode.REAL_TIME,
 		jsFilter: false,
 		maxItems: 20,
 		mutableObjects: false,
-		queryCode:
+		queryCode: defaultQueryCode
-`// \`message\` contains all metadata
-// \`value\` is shorthand for message.value
-//    it contains the actual produced data
-// \`json\` is a JSON representation of \`message\`
-
-return message.value.eventType === "Television";`
 	}
 
 	let topics = []
-	let clusters = []
+	let clusterNames = []
-	const updateTopics = async () => {
+	const updateTopics = async (updateTopic = true) => {
-		topics = await apiFetch(`/topics/${querySettings.cluster}`)
+		topics = await getTopics(querySettings.cluster)
-		topics ??= []
+		if (updateTopic) {
-		topics.sort()
-		console.log('topics', topics)
 			querySettings.topic = topics[0]
 		}
-	const fontSizes = [30, 50, 67, 80, 90, 100, 110, 120, 133, 150]
-	let dataViewFontSize = 5
-	const setFontSize = size => {
-		dataViewFontSize = size
-		localStorage.dataViewFontSize = size
 	}
-	const fontUp = () => setFontSize(Math.min(dataViewFontSize + 1, fontSizes.length - 1))
+
-	const fontDown = () => setFontSize(Math.max(dataViewFontSize - 1, 0))
 
 	onMount(async () => {
+		const loadSave = ({ checked }) => {
+			if (localStorage) {
+				mapFromLocalStorage({
+					checked,
+					jsonDisplay,
+					querySettings,
+					clusterNames,
+					topics,
+				})
+				jsonDisplay = jsonDisplay
+				querySettings = querySettings
+			}
+		}
+
+		// Instantly load saved data as if cluster and topic names are accurate
+		// This should usually be the case
+		loadSave({ checked: false })
+
 		connect()
-		clusters = Object.keys((await apiFetch('/clusters')) || {})
+		clusterNames = await getClusterNames()
-		querySettings.cluster = clusters[0]
 		await updateTopics()
 
-		if (localStorage) {
+		// Reload with confirmed truthful values
-			dataViewFontSize = localStorage.dataViewFontSize || dataViewFontSize
+		// Will only flicker if topic or cluster names have changed
-			if (localStorage.querySettings) {
+		loadSave({ checked: true })
-				let storedSettings = {}
-				try {
-					storedSettings = JSON.parse(localStorage.querySettings)
-				} catch (e) {}
-				querySettings.maxItems = storedSettings?.maxItems || querySettings.maxItems
-				querySettings.jsFilter = storedSettings?.jsFilter || querySettings.jsFilter
-				querySettings.queryCode = storedSettings?.queryCode || querySettings.queryCode
-				querySettings.mode = storedSettings?.mode || querySettings.mode
-				if (clusters.includes(storedSettings?.cluster)) {
-					querySettings.cluster = storedSettings.cluster
-				}
-				if (topics.includes(storedSettings?.topic)) {
-					querySettings.topic = storedSettings.topic
-				}
-			}
-		}
 	})
-
-	let queryRunning = false
-	const startQuery = () => {
-		queryRunning = true
-		localStorage.setItem('querySettings', JSON.stringify(querySettings))
-		query(querySettings)
-	}
-	const stopQuery = () => {
-		queryRunning = false
-		killQuery(querySettings)
-	}
 </script>
 
 <svelte:head>
 	<title>{querySettings.topic ? `${querySettings.topic} - ` : ''}Kafka Dance</title>
-	<meta name="description" content="Kafka Dance" />
+	<meta name="description" content="Kafka Dance message search" />
 </svelte:head>
 
 <section>
@@ -96,16 +90,19 @@ return message.value.eventType === "Television";`
 		<Header />
 		<NavBar />
 		-->
-		<h1>Message Search</h1>
+		<h1>Topic Search</h1>
 		{#if $state.error}
 			<div class="state-error">{$state.error}</div>
+			{#if $state.errorDetails}
+				<div class="state-error-details">{$state.errorDetails}</div>
+			{/if}
 		{/if}
 
 		<div class="settings-option">
 			<h3>Cluster</h3>
-			<select disabled={clusters.length === 0} bind:value={querySettings.cluster} name="cluster" id="cluster" on:change={updateTopics}>
+			<select disabled={clusterNames.length === 0} bind:value={querySettings.cluster} name="cluster" id="cluster" on:change={updateTopics}>
-				{#each clusters as cluster}
+				{#each clusterNames as clusterName}
-					<option value={cluster}>{cluster}</option>
+					<option value={clusterName}>{clusterName}</option>
 				{/each}
 			</select>
 		</div>
@@ -167,27 +164,22 @@ return message.value.eventType === "Television";`
 
 		<div class="query-button">
 			{#if queryRunning}
-				<button class="danger" on:click={() => stopQuery()}>Stop Query</button>
+				<button class="danger" on:click={() => queryRunning = stopQuery(querySettings)}>Stop Query</button>
 			{:else}
-				<button class="colored" on:click={() => startQuery()}>Start Query</button>
+				<button class="colored" on:click={() => queryRunning = startQuery(querySettings)}>Start Query</button>
 			{/if}
 		</div>
-
-		<br>
-		<div class="live-settings">
-			<!--{#if $state.itemCount >= 0}
-				<h2>{$state.itemCount} Matches Found...</h2>
-			{/if}-->
-		</div>
 	</div>
 
 	<div class="data-view-container">
 		<div class="data-view-bar">
 			<div class="border-between">
-				<button class={expandAll ? 'selected' : ''} on:click={() => expandAll = !expandAll}>
+				<button class={jsonDisplay.expandAll ? 'selected' : ''}
+						on:click={() => jsonDisplay.expandAll = !jsonDisplay.expandAll}>
 				Expand All Objects
 				</button>
-				<button class={showMetadata ? 'selected' : ''} on:click={() => showMetadata = !showMetadata}>
+				<button class={jsonDisplay.showMetadata ? 'selected' : ''}
+						on:click={() => jsonDisplay.showMetadata = !jsonDisplay.showMetadata}>
 				Show Metadata
 				</button>
 			</div>
@@ -198,15 +190,15 @@ return message.value.eventType === "Television";`
 					</div>
 				{/if}
 				<div class="border-between zoom-buttons">
-					<button on:click={fontDown} style="border-color: #aaa;">-</button>
+					<button on:click={jsonDisplay.fontDown} style="border-color: #aaa;">-</button>
-					<button on:click={fontUp}>+</button>
+					<button on:click={jsonDisplay.fontUp}>+</button>
 				</div>
 			</div>
 		</div>
 		{#if $state.items?.length > 0}
-			<div class="data-view" style={`font-size: ${fontSizes[dataViewFontSize]}%`}>
+			<div class="data-view" style={`font-size: ${fontSizes[jsonDisplay.fontSize]}%`}>
-				<JsonView json={showMetadata ? $state.items : $state.items.map(item => item.value)}
+				<JsonView json={jsonDisplay.showMetadata ? $state.items : $state.items.map(item => item.value)}
-						  depth={expandAll ? Infinity : 1}/>
+						  depth={jsonDisplay.expandAll ? Infinity : 1}/>
 			</div>
 		{:else }
 			<div class="data-view no-query-data">
@@ -322,6 +314,11 @@ return message.value.eventType === "Television";`
 		color: #ff2222;
 		font-weight: bold;
 	}
+	.state-error-details {
+		color: #ff2222;
+		font-weight: normal;
+		font-size: 80%;
+	}
 
 	/* JsonView config
 	:root {

src/routes/settings/+page.svelte

@@ -41,8 +41,7 @@
     clusterName: '',    // and will be POSTed as a new cluster, not PUTted, updating an existing one
     clientId: '',
     brokers: [''],
-    useSasl: true,
+    ssl: false,
-    ssl: true,
     sasl: {
       mechanism: '',
       username: '',
@@ -69,7 +68,7 @@
 </svelte:head>
 
 <section>
-    <div class="query-settings">
+    <form class="query-settings" method="post">
         <h1>Cluster Configuration</h1>
 
         <div class="settings-option">
@@ -109,7 +108,7 @@
 
         <!-- TODO: Add options for SSL config -->
         <div class="settings-option">
-            <div>SASL: <input type=checkbox bind:checked={useSasl} /></div>
+            <div>Use SASL: <input type=checkbox bind:checked={useSasl} /></div>
             {#if useSasl}
                 <div class="settings-sub-option">
                     <div>Auth Mechanism:</div>
@@ -132,7 +131,7 @@
 
         <button style="float: right;"
                 on:click={() => (config.originalName ? updateCluster() : addCluster())}>{config.originalName ? 'Update Cluster Config' : 'Add Cluster Config'}</button>
-    </div>
+    </form>
 
     <div class="data-view">
         <button style="margin: 1em;" on:click={startNewCluster}>Add New Cluster</button>

src/utils.js

@@ -65,7 +65,11 @@ export const apiFetch = async (path, options = undefined) => {
         return undefined
     }
     try {
-        return response.json()
+        const json = await response.json()
+        if (json.error) {
+            state.update(s => ({ ...s, error: json.error, errorDetails: json.errorDetails }))
+        }
+        return json
     } catch (e) {
         console.error(e)
         state.update(s => ({ ...s, error: 'Received non-JSON response from backend' }))