init commit,

99_references/supabase-examples/edge-functions/supabase/functions/upstash-redis-counter/index.ts

@@ -0,0 +1,48 @@
+// Follow this setup guide to integrate the Deno language server with your editor:
+// https://deno.land/manual/getting_started/setup_your_environment
+// This enables autocomplete, go to definition, etc.
+
+import { Redis } from 'https://deno.land/x/upstash_redis@v1.19.3/mod.ts'
+
+console.log(`Function "upstash-redis-counter" up and running!`)
+
+Deno.serve(async (_req) => {
+  try {
+    const redis = new Redis({
+      url: Deno.env.get('UPSTASH_REDIS_REST_URL')!,
+      token: Deno.env.get('UPSTASH_REDIS_REST_TOKEN')!,
+    })
+
+    const deno_region = Deno.env.get('DENO_REGION')
+    if (deno_region) {
+      // Increment region counter
+      await redis.hincrby('supa-edge-counter', deno_region, 1)
+    } else {
+      // Increment localhost counter
+      await redis.hincrby('supa-edge-counter', 'localhost', 1)
+    }
+
+    // Get all values
+    const counterHash: Record<string, number> | null = await redis.hgetall('supa-edge-counter')
+    const counters = Object.entries(counterHash!)
+      .sort(([, a], [, b]) => b - a) // sort desc
+      .reduce(
+        (r, [k, v]) => ({
+          total: r.total + v,
+          regions: { ...r.regions, [k]: v },
+        }),
+        {
+          total: 0,
+          regions: {},
+        }
+      )
+
+    return new Response(JSON.stringify({ counters }), { status: 200 })
+  } catch (error) {
+    return new Response(JSON.stringify({ error: error.message }), {
+      status: 200,
+    })
+  }
+})
+
+// To invoke, navigate to 'http://localhost:54321/functions/v1/upstash-redis-counter'.