feat: support backend option for fastly (#31)

* feat: support backend option for fastly

* fix: make backend optional

examples/fastly/src/index.js

@@ -1,17 +1,17 @@
-import { Router } from "flight-path"
-import { auth, incr } from "@upstash/redis"
+import { Redis } from "@upstash/redis"
 
-const router = new Router()
+addEventListener("fetch", (event) => event.respondWith(handleRequest(event)))
 
-auth({
-  url: "UPSTASH_REDIS_REST_URL",
-  token: "UPSTASH_REDIS_REST_TOKEN",
-  requestOptions: { backend: "upstash-db" },
-})
+async function handleRequest(event) {
+  const redis = new Redis({
+    url: "<UPSTASH_REDIS_REST_URL>",
+    token: "<UPSTASH_REDIS_REST_TOKEN>",
+    requestOptions: { backend: "upstash-db" },
+  })
 
-router.get("/", async (req, res) => {
-  const { data: count } = await incr("count")
-  res.send(`Fastly with Upstash! Count: ${count}`)
-})
-
-router.listen()
+  const counter = await redis.incr("fastly")
+  // Catch all other requests and return a 404.
+  return new Response(`Counter: ${counter}`, {
+    status: 404,
+  })
+}

pkg/http.ts

@@ -21,16 +21,22 @@ export type UpstashResponse<TResult> = {
 export type HttpClientConfig = {
   headers?: Record<string, string>
   baseUrl: string
+  options?: {
+    backend?: string
+  }
 }
 
 export class HttpClient {
   public baseUrl: string
   public headers: Record<string, string>
+  public readonly options?: { backend?: string }
 
   public constructor(config: HttpClientConfig) {
     this.baseUrl = config.baseUrl.replace(/\/$/, "")
 
     this.headers = config.headers ?? {}
+
+    this.options = config.options
   }
 
   private async request<TResponse>(
@@ -52,6 +58,8 @@ export class HttpClient {
       method,
       headers,
       body: JSON.stringify(req.body),
+      // @ts-expect-error
+      backend: this.options?.backend,
     })
     const body = await res.json()
     if (!res.ok) {

pkg/redis.ts

@@ -128,6 +128,17 @@ export type RedisConfig = {
    * UPSTASH_REDIS_REST_TOKEN
    */
   token: string
+
+  requestOptions?: {
+    /**
+     * **fastly only**
+     *
+     * A Request can be forwarded to any backend defined on your service. Backends
+     * can be created via the Fastly CLI, API, or web interface, and are
+     * referenced by name.
+     */
+    backend?: string
+  }
 }
 
 /**
@@ -153,6 +164,7 @@ export class Redis {
       headers: {
         authorization: `Bearer ${config.token}`,
       },
+      options: config.requestOptions,
     })
   }