Add hello world example for Durable Objects (#4747)

Author: joshthoward

packages/create-cloudflare/e2e-tests/cli.test.ts

@@ -107,7 +107,7 @@ describe.skipIf(frameworkToTest || isQuarantineMode())(
 						},
 						{
 							matcher: /What type of application do you want to create/,
-							input: [keys.down, keys.down, keys.enter],
+							input: [keys.down, keys.down, keys.down, keys.enter],
 						},
 						{
 							matcher: /Do you want to use TypeScript/,

packages/create-cloudflare/src/templateMap.ts

@@ -13,6 +13,10 @@ export const templateMap: Record<string, TemplateConfig> = {
 		label: `"Hello World" Worker`,
 		handler: runWorkersGenerator,
 	},
+	"hello-world-durable-object": {
+		label: `"Hello World" Durable Object`,
+		handler: runWorkersGenerator,
+	},
 	webFramework: {
 		label: "Website or web app",
 		handler: runPagesGenerator,

packages/create-cloudflare/templates/hello-world-durable-object/js/.editorconfig

@@ -0,0 +1,13 @@
+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = tab
+tab_width = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.yml]
+indent_style = space

packages/create-cloudflare/templates/hello-world-durable-object/js/.gitignore

@@ -0,0 +1,172 @@
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+\*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+\*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+\*.tsbuildinfo
+
+# Optional npm cache directory
+
+.npm
+
+# Optional eslint cache
+
+.eslintcache
+
+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+\*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.cache
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+.cache/
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+.cache
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.\*
+
+# wrangler project
+
+.dev.vars
+.wrangler/

packages/create-cloudflare/templates/hello-world-durable-object/js/.prettierrc

@@ -0,0 +1,6 @@
+{
+	"printWidth": 140,
+	"singleQuote": true,
+	"semi": true,
+	"useTabs": true
+}

packages/create-cloudflare/templates/hello-world-durable-object/js/package.json

@@ -0,0 +1,13 @@
+{
+	"name": "<TBD>",
+	"version": "0.0.0",
+	"private": true,
+	"scripts": {
+		"deploy": "wrangler deploy",
+		"dev": "wrangler dev",
+		"start": "wrangler dev"
+	},
+	"devDependencies": {
+		"wrangler": "^3.0.0"
+	}
+}

packages/create-cloudflare/templates/hello-world-durable-object/js/src/index.js

@@ -0,0 +1,65 @@
+/**
+ * Welcome to Cloudflare Workers! This is your first Durable Objects application.
+ *
+ * - Run `npm run dev` in your terminal to start a development server
+ * - Open a browser tab at http://localhost:8787/ to see your Durable Object in action
+ * - Run `npm run deploy` to publish your application
+ *
+ * Learn more at https://developers.cloudflare.com/durable-objects
+ */
+
+/**
+ * Env provides a mechanism to reference bindings declared in wrangler.toml within JavaScript
+ *
+ * @typedef {Object} Env
+ * @property {DurableObjectNamespace} MY_DURABLE_OBJECT - The Durable Object namespace binding
+ */
+
+/** A Durable Object's behavior is defined in an exported Javascript class */
+export class MyDurableObject {
+	/**
+	 * The constructor is invoked once upon creation of the Durable Object, i.e. the first call to
+	 * 	`DurableObjectStub::get` for a given identifier
+	 *
+	 * @param {DurableObjectState} state - The interface for interacting with Durable Object state
+	 * @param {Env} env - The interface to reference bindings declared in wrangler.toml
+	 */
+	constructor(state, env) {}
+
+	/**
+	 * The Durable Object fetch handler will be invoked when a Durable Object instance receives a
+	 * 	request from a Worker via an associated stub
+	 *
+	 * @param {Request} request - The request submitted to a Durable Object instance from a Worker
+	 * @returns {Promise<Response>} The response to be sent back to the Worker
+	 */
+	async fetch(request) {
+		return new Response('Hello World');
+	}
+}
+
+export default {
+	/**
+	 * This is the standard fetch handler for a Cloudflare Worker
+	 *
+	 * @param {Request} request - The request submitted to the Worker from the client
+	 * @param {Env} env - The interface to reference bindings declared in wrangler.toml
+	 * @param {ExecutionContext} ctx - The execution context of the Worker
+	 * @returns {Promise<Response>} The response to be sent back to the client
+	 */
+	async fetch(request, env, ctx) {
+		// We will create a `DurableObjectId` using the pathname from the Worker request
+		// This id refers to a unique instance of our 'MyDurableObject' class above
+		let id = env.MY_DURABLE_OBJECT.idFromName(new URL(request.url).pathname);
+
+		// This stub creates a communication channel with the Durable Object instance
+		// The Durable Object constructor will be invoked upon the first call for a given id
+		let stub = env.MY_DURABLE_OBJECT.get(id);
+
+		// We call `fetch()` on the stub to send a request to the Durable Object instance
+		// The Durable Object instance will invoke its fetch handler to handle the request
+		let response = await stub.fetch(request);
+
+		return response;
+	},
+};

packages/create-cloudflare/templates/hello-world-durable-object/js/wrangler.toml

@@ -0,0 +1,51 @@
+name = "<TBD>"
+main = "src/index.js"
+compatibility_date = "<TBD>"
+
+# Variable bindings. These are arbitrary, plaintext strings (similar to environment variables)
+# Note: Use secrets to store sensitive data.
+# Docs: https://developers.cloudflare.com/workers/platform/environment-variables
+# [vars]
+# MY_VARIABLE = "production_value"
+
+# Bind a KV Namespace. Use KV as persistent storage for small key-value pairs.
+# Docs: https://developers.cloudflare.com/workers/runtime-apis/kv
+# [[kv_namespaces]]
+# binding = "MY_KV_NAMESPACE"
+# id = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+
+# Bind an R2 Bucket. Use R2 to store arbitrarily large blobs of data, such as files.
+# Docs: https://developers.cloudflare.com/r2/api/workers/workers-api-usage/
+# [[r2_buckets]]
+# binding = "MY_BUCKET"
+# bucket_name = "my-bucket"
+
+# Bind a Queue producer. Use this binding to schedule an arbitrary task that may be processed later by a Queue consumer.
+# Docs: https://developers.cloudflare.com/queues/get-started
+# [[queues.producers]]
+# binding = "MY_QUEUE"
+# queue = "my-queue"
+
+# Bind a Queue consumer. Queue Consumers can retrieve tasks scheduled by Producers to act on them.
+# Docs: https://developers.cloudflare.com/queues/get-started
+# [[queues.consumers]]
+# queue = "my-queue"
+
+# Bind another Worker service. Use this binding to call another Worker without network overhead.
+# Docs: https://developers.cloudflare.com/workers/platform/services
+# [[services]]
+# binding = "MY_SERVICE"
+# service = "my-service"
+
+# Bind a Durable Object. Durable objects are a scale-to-zero compute primitive based on the actor model.
+# Durable Objects can live for as long as needed. Use these when you need a long-running "server", such as in realtime apps.
+# Docs: https://developers.cloudflare.com/workers/runtime-apis/durable-objects
+[[durable_objects.bindings]]
+name = "MY_DURABLE_OBJECT"
+class_name = "MyDurableObject"
+
+# Durable Object migrations.
+# Docs: https://developers.cloudflare.com/workers/learning/using-durable-objects#configure-durable-object-classes-with-migrations
+[[migrations]]
+tag = "v1"
+new_classes = ["MyDurableObject"]

packages/create-cloudflare/templates/hello-world-durable-object/ts/.editorconfig

@@ -0,0 +1,13 @@
+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = tab
+tab_width = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.yml]
+indent_style = space