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Upstash Redis

A Redis counter example that stores a hash of function invocation count per region. Find the code on GitHub.

Redis database setup#

Create a Redis database using the Upstash Console or Upstash CLI.

Select the Global type to minimize the latency from all edge locations. Copy the UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN to your .env file.

You'll find them under Details > REST API > .env.


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cp supra/functions/upstash-redis-counter/.env.example supra/functions/upstash-redis-counter/.env

Code#

Make sure you have the latest version of the Supra CLI installed.

Create a new function in your project:


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supra functions new upstash-redis-counter

And add the code to the index.ts file:

index.ts

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import { serve } from 'https://deno.land/std@0.177.0/http/server.ts'
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import { Redis } from 'https://deno.land/x/upstash_redis@v1.19.3/mod.ts'
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console.log(`Function "upstash-redis-counter" up and running!`)
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serve(async (_req) => {
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try {
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const redis = new Redis({
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url: Deno.env.get('UPSTASH_REDIS_REST_URL')!,
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token: Deno.env.get('UPSTASH_REDIS_REST_TOKEN')!,
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})
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const deno_region = Deno.env.get('DENO_REGION')
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if (deno_region) {
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// Increment region counter
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await redis.hincrby('supa-edge-counter', deno_region, 1)
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} else {
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// Increment localhost counter
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await redis.hincrby('supa-edge-counter', 'localhost', 1)
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}
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// Get all values
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const counterHash: Record<string, number> | null = await redis.hgetall('supa-edge-counter')
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const counters = Object.entries(counterHash!)
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.sort(([, a], [, b]) => b - a) // sort desc
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.reduce((r, [k, v]) => ({ total: r.total + v, regions: { ...r.regions, [k]: v } }), {
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total: 0,
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regions: {},
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})
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return new Response(JSON.stringify({ counters }), { status: 200 })
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} catch (error) {
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return new Response(JSON.stringify({ error: error.message }), { status: 200 })
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}
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})

Run locally#


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supra start
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supra functions serve --no-verify-jwt --env-file supra/functions/upstash-redis-counter/.env

Navigate to http://localhost:54321/functions/v1/upstash-redis-counter.

Deploy#


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supra functions deploy upstash-redis-counter --no-verify-jwt
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supra secrets set --env-file supra/functions/upstash-redis-counter/.env

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