Edge Functions

Integrating with Supabase Storage

Edge Functions work seamlessly with Supabase Storage. This allows you to:

  • Upload generated content directly from your functions
  • Implement cache-first patterns for better performance
  • Serve files with built-in CDN capabilities

Basic file operations#

Use the Supabase client to upload files directly from your Edge Functions. You'll need the secret key for server-side storage operations:

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import { createClient } from 'npm:@supabase/supabase-js@2'
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const SUPABASE_SECRET_KEYS = JSON.parse(Deno.env.get('SUPABASE_SECRET_KEYS')!)
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Deno.serve(async (req) => {
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  const supabaseAdmin = createClient(
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    Deno.env.get('SUPABASE_URL')!,
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    // If you want to use a different api key, change 'default' to your preferred key name
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    SUPABASE_SECRET_KEYS['default']
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  )
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  // Generate your content
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  const fileContent = await generateImage()
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  // Upload to storage
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  const { data, error } = await supabaseAdmin.storage
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    .from('images')
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    .upload(`generated/${filename}.png`, fileContent.body!, {
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      contentType: 'image/png',
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      cacheControl: '3600',
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      upsert: false,
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    })
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  if (error) {
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    throw error
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  }
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  return new Response(JSON.stringify({ path: data.path }))
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})

Cache-first pattern#

Check storage before generating new content to improve performance:

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const STORAGE_URL = 'https://your-project.supabase.co/storage/v1/object/public/images'
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Deno.serve(async (req) => {
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  const url = new URL(req.url)
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  const username = url.searchParams.get('username')
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  try {
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    // Try to get existing file from storage first
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    const storageResponse = await fetch(`${STORAGE_URL}/avatars/${username}.png`)
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    if (storageResponse.ok) {
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      // File exists in storage, return it directly
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      return storageResponse
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    }
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    // File doesn't exist, generate it
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    const generatedImage = await generateAvatar(username)
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    // Upload to storage for future requests
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    const { error } = await supabaseAdmin.storage
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      .from('images')
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      .upload(`avatars/${username}.png`, generatedImage.body!, {
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        contentType: 'image/png',
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        cacheControl: '86400', // Cache for 24 hours
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      })
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    if (error) {
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      console.error('Upload failed:', error)
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    }
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    return generatedImage
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  } catch (error) {
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    return new Response('Error processing request', { status: 500 })
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  }
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})