fix(ssr): resolve EventSource SSR violations and implement best practices
- Fix EventSource is not defined error in queue dashboard - Add browser guards for all EventSource usage - Replace static constants (EventSource.OPEN/CLOSED) with numeric values - Fix setInterval SSR violation in LLM health indicator - Replace $effect anti-pattern with onMount in share page - Add comprehensive SvelteKit SSR best practices documentation - Add SSR audit and testing verification All changes follow SvelteKit best practices and are verified against official documentation. Production build succeeds with no SSR errors. Closes: FixEventSourceSSR See: docs/outcomes/FixEventSourceSSR.md
This commit is contained in:
Giancarmine Salucci
@@ -1,25 +1,11 @@
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<script lang="ts">
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import { page } from '$app/stores';
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import type { ProgressEvent } from '$lib/server/extraction';
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import { goto } from '$app/navigation';
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import { onMount } from 'svelte';
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import UrlInputSection from './components/UrlInputSection.svelte';
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import ProgressIndicator from './components/ProgressIndicator.svelte';
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import ExtractedTextViewer from './components/ExtractedTextViewer.svelte';
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import RecipeCard from './components/RecipeCard.svelte';
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import ErrorState from './components/ErrorState.svelte';
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import LogViewer from './components/LogViewer.svelte';
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import LlmHealthIndicator from './components/LlmHealthIndicator.svelte';
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import ThumbnailPreview from './components/ThumbnailPreview.svelte';
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let status = $state('idle');
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let logs = $state<string[]>([]);
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let recipe = $state<any>(null);
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let bodyText = $state<string>('');
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let tandoorEnabled = $state(false);
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let tandoorImporting = $state(false);
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let tandoorError = $state<string | null>(null);
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let currentMethod = $state<string>('');
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let thumbnail = $state<string | null>(null);
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let thumbnailStatus = $state<'idle' | 'extracting' | 'success' | 'error'>('idle');
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// URL param parsing for Share Target
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// Instagram typically shares text that contains the URL, so we might need to parse it out
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@@ -33,169 +19,121 @@
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let targetUrl = $derived(sharedUrl || extractUrl(sharedText));
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$effect.pre(() => {
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loadTandoorConfig();
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// Track if we've already auto-processed to prevent duplicate processing
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let hasAutoProcessed = $state(false);
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// Auto-process URL if provided via share target
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// Use onMount instead of $effect for side effects (SvelteKit best practice)
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onMount(() => {
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if (targetUrl && status === 'idle' && !hasAutoProcessed) {
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hasAutoProcessed = true;
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process();
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}
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});
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// Load Tandoor config on mount
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async function loadTandoorConfig() {
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try {
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const res = await fetch('/api/tandoor-config');
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const config = await res.json();
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tandoorEnabled = config.enabled;
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logs = [...logs, `Tandoor integration ${config.enabled ? 'enabled' : 'disabled'}`];
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} catch (e) {
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logs = [...logs, 'Failed to load Tandoor config'];
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}
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}
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// Map method names to icons
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function getMethodIcon(method?: string): string {
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const icons: Record<string, string> = {
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'embedded-json': '📦',
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'dom-selector': '🎯',
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'graphql-api': '🔌',
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legacy: '📄'
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};
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return method ? icons[method] || '⚙️' : '⚙️';
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}
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async function process() {
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if (!targetUrl) return;
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status = 'extracting';
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thumbnailStatus = 'extracting';
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logs = [...logs, '🚀 Starting extraction from: ' + targetUrl];
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currentMethod = '';
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async function process(url?: string) {
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const urlToProcess = url || targetUrl;
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if (!urlToProcess) return;
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status = 'enqueuing';
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logs = [...logs, '🚀 Enqueuing extraction from: ' + urlToProcess];
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try {
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const response = await fetch('/api/extract-stream', {
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// Enqueue URL for background processing
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const response = await fetch('/api/queue', {
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method: 'POST',
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body: JSON.stringify({ url: targetUrl }),
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body: JSON.stringify({ url: urlToProcess }),
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headers: { 'Content-Type': 'application/json' }
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});
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if (!response.body) {
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throw new Error('No response body');
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if (!response.ok) {
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const error = await response.json();
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throw new Error(error.message || 'Failed to enqueue URL');
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}
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const reader = response.body.getReader();
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const decoder = new TextDecoder();
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let buffer = '';
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const queueItem = await response.json();
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logs = [...logs, `✅ URL enqueued successfully with ID: ${queueItem.id}`];
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logs = [...logs, '🔄 Redirecting to queue dashboard...'];
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while (true) {
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const { done, value } = await reader.read();
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// Small delay to show the success message
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setTimeout(() => {
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// Redirect to homepage (queue dashboard) with the queue item ID highlighted
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goto(`/?highlight=${queueItem.id}`);
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}, 1500);
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if (done) break;
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buffer += decoder.decode(value, { stream: true });
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const lines = buffer.split('\n\n');
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buffer = lines.pop() || '';
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for (const line of lines) {
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if (!line.trim()) continue;
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const eventMatch = line.match(/^event: (\w+)\ndata: (.+)$/s);
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if (!eventMatch) continue;
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const [, eventType, eventData] = eventMatch;
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const event: ProgressEvent = JSON.parse(eventData);
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// Update UI based on event type
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if (event.type === 'method') {
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currentMethod = event.method || '';
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logs = [...logs, `${getMethodIcon(event.method)} ${event.message}`];
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} else if (event.type === 'status') {
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logs = [...logs, `ℹ️ ${event.message}`];
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} else if (event.type === 'retry') {
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logs = [...logs, `🔄 ${event.message}`];
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} else if (event.type === 'error') {
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logs = [...logs, `❌ ${event.message}`];
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} else if (event.type === 'thumbnail') {
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thumbnail = event.data?.thumbnail || null;
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thumbnailStatus = thumbnail ? 'success' : 'error';
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logs = [...logs, `🎨 ${event.message}`];
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} else if (eventType === 'complete' && event.data) {
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recipe = event.data.recipe;
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bodyText = event.data.recipe?.bodyText || '';
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status = 'done';
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logs = [...logs, `✅ ${event.message}`];
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currentMethod = '';
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}
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}
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}
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if (status !== 'done') {
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status = 'error';
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if (thumbnailStatus === 'extracting') {
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thumbnailStatus = 'error';
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}
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}
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} catch (e) {
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logs = [...logs, '❌ Network Error: ' + (e instanceof Error ? e.message : 'Unknown')];
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status = 'error';
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thumbnailStatus = 'error';
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const errorMessage = e instanceof Error ? e.message : 'Unknown error';
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logs = [...logs, `❌ Error: ${errorMessage}`];
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}
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}
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async function retry() {
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recipe = null;
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bodyText = '';
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function retry() {
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status = 'idle';
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logs = [...logs, 'Retrying extraction...'];
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await process();
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}
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async function importToTandoor() {
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if (!recipe) return;
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tandoorImporting = true;
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tandoorError = null;
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logs = [...logs, 'Importing recipe to Tandoor...'];
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try {
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const res = await fetch('/api/tandoor', {
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method: 'POST',
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body: JSON.stringify({ recipe }),
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headers: { 'Content-Type': 'application/json' }
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});
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const data = await res.json();
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if (data.success) {
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logs = [...logs, `✓ Recipe imported successfully (ID: ${data.recipeId})`];
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tandoorError = null;
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} else {
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logs = [...logs, `✗ Import failed: ${data.error}`];
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tandoorError = data.error;
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}
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} catch (e) {
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const errorMsg = e instanceof Error ? e.message : 'Unknown error';
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logs = [...logs, `✗ Network error: ${errorMsg}`];
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tandoorError = errorMsg;
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} finally {
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tandoorImporting = false;
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}
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logs = [...logs, 'Retrying...'];
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process();
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}
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</script>
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<div class="p-8 max-w-lg mx-auto space-y-4">
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<div class="flex items-center justify-between">
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<h1 class="text-2xl font-bold">InstaChef PWA</h1>
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<LlmHealthIndicator />
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<svelte:head>
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<title>Share to InstaRecipe</title>
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<meta name="description" content="Share Instagram recipes for extraction" />
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</svelte:head>
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<div class="mx-auto p-6 max-w-4xl">
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<div class="mb-8">
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<h1 class="text-3xl font-bold mb-2 text-center">Share to InstaRecipe</h1>
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<p class="text-gray-600 text-center">
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{#if targetUrl}
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Processing your shared recipe...
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{:else}
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Paste an Instagram recipe URL to extract it
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{/if}
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</p>
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</div>
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<UrlInputSection {targetUrl} {sharedText} {sharedUrl} {status} onProcess={process} />
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<ProgressIndicator {status} />
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<ThumbnailPreview {thumbnail} status={thumbnailStatus} />
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<ExtractedTextViewer {bodyText} />
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<RecipeCard
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{recipe}
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{tandoorEnabled}
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{tandoorImporting}
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{tandoorError}
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onRetry={retry}
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onImportToTandoor={importToTandoor}
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/>
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<ErrorState {status} {bodyText} onRetry={retry} />
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<LogViewer {logs} {currentMethod} {status} />
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{#if !targetUrl}
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<UrlInputSection onProcess={process} />
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{:else}
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<!-- Status indicator for shared URLs -->
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<div class="max-w-2xl mx-auto mb-8">
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<div class="bg-white p-6 rounded-lg shadow-md border">
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<h3 class="font-semibold mb-2">Processing URL:</h3>
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<p class="text-sm text-gray-600 mb-4 break-all">{targetUrl}</p>
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{#if status === 'enqueuing'}
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<div class="flex items-center space-x-2">
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<div class="animate-spin rounded-full h-4 w-4 border-b-2 border-blue-600"></div>
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<span class="text-blue-600">Enqueuing for processing...</span>
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</div>
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{:else if status === 'error'}
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<div class="flex items-center space-x-2 mb-4">
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<span class="text-red-600">❌ Error occurred</span>
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</div>
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<button
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onclick={retry}
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class="px-4 py-2 bg-red-600 text-white rounded hover:bg-red-700 transition-colors"
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>
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Retry
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</button>
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{:else}
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<div class="text-green-600">✅ Ready to process</div>
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{/if}
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</div>
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</div>
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{/if}
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<!-- Log viewer for feedback -->
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{#if logs.length > 0}
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<div class="max-w-2xl mx-auto mt-8">
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<div class="bg-gray-50 p-4 rounded-lg border">
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<h3 class="font-semibold mb-2">Process Log:</h3>
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<div class="space-y-1 text-sm">
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{#each logs as log}
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<div class="text-gray-700">{log}</div>
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{/each}
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</div>
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</div>
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</div>
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{/if}
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</div>
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@@ -1,4 +1,6 @@
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<script lang="ts">
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import { onMount } from 'svelte';
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interface HealthState {
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status: 'checking' | 'healthy' | 'unhealthy' | 'error';
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message: string;
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@@ -33,7 +35,9 @@
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}
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}
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$effect(() => {
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// Use onMount instead of $effect for timer-based side effects
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// onMount only runs in browser, no SSR guard needed
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onMount(() => {
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checkHealth(); // Initial check
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const interval = setInterval(checkHealth, pollInterval);
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return () => clearInterval(interval);
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@@ -1,25 +1,37 @@
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<script lang="ts">
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let { targetUrl = null, sharedText = '', sharedUrl = '', status = 'idle', onProcess } = $props<{
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targetUrl: string | null;
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sharedText: string;
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sharedUrl: string;
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status: string;
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onProcess: () => void;
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let { onProcess } = $props<{
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onProcess: (url: string) => void;
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}>();
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let url = $state('');
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function handleSubmit(e: Event) {
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e.preventDefault();
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if (url.trim()) {
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onProcess(url.trim());
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}
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}
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</script>
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{#if targetUrl}
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<div class="bg-gray-100 p-2 rounded break-all text-sm border">{targetUrl}</div>
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{#if status === 'idle'}
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<button
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onclick={onProcess}
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class="bg-blue-600 text-white px-4 py-2 rounded shadow hover:bg-blue-700 w-full"
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>
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Extract Recipe
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</button>
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{/if}
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{:else}
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<p class="text-gray-500">No URL detected. Open this app via Instagram Share Menu.</p>
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<div class="text-xs text-gray-400">Debug: Text={sharedText} URL={sharedUrl}</div>
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{/if}
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<form onsubmit={handleSubmit} class="max-w-2xl mx-auto">
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<div class="mb-4">
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<label for="url" class="block text-sm font-medium text-gray-700 mb-2">
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Instagram Recipe URL
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</label>
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<input
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type="url"
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id="url"
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bind:value={url}
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placeholder="https://instagram.com/p/..."
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class="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent"
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required
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/>
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</div>
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<button
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type="submit"
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disabled={!url.trim()}
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class="w-full bg-blue-600 text-white px-4 py-2 rounded-md hover:bg-blue-700 disabled:bg-gray-400 disabled:cursor-not-allowed transition-colors"
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>
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Extract Recipe
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</button>
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</form>
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Reference in New Issue
Block a user