Edge Computing with Cloudflare Workers & Deno · 강의

사용자 지정 런타임 환경

엣지에서 사용자 지정 런타임 환경 또는 특수한 Deno 배포를 활용할 수 있는 방법을 이해합니다.

사용자 지정 런타임 환경은(는) CoddyKit의 무료 Edge Computing with Cloudflare Workers & Deno 강의입니다. 이것은 4개 중 2번째 강의입니다. 아래에서 전체 강의를 무료로 읽을 수 있으며, 내장 코드 에디터와 24/7 AI 튜터와 함께 브라우저에서 직접 실습할 수 있습니다. 이 강의는 Edge Computing with Cloudflare Workers & Deno 학습 경로의 일부이며, 진행 상황이 웹과 CoddyKit 앱에 동기화됩니다. Edge Computing with Cloudflare Workers & Deno 강의에는 총 4개의 강의가 포함되어 있습니다.

이 강의의 일부는 아직 번역되지 않았으며 영어로 표시됩니다.

Intro to Custom Runtimes

Welcome! Today we'll explore custom runtime environments and specialized Deno deployments at the edge.

A custom runtime lets you tailor the execution environment for your code. Instead of using a standard, pre-configured serverless runtime, you can define specific versions, dependencies, or even entirely different languages.

At the edge, this means more control over how your code runs close to users, potentially unlocking new performance and functionality.

Why Customize at the Edge?

Why would you need a custom runtime?

Specialized Libraries: Use native libraries or specific versions not available in standard runtimes.
Performance: Optimize for specific workloads, like heavy computation or data processing, by using highly efficient languages or custom binaries.
Resource Control: Fine-tune memory, CPU, or network usage for highly specific edge devices.
Unique Languages: Run code written in languages other than JavaScript/TypeScript, often compiled to WebAssembly.

Deno's Role in Customization

Deno's design makes it particularly suitable for custom edge environments:

Single Executable: Deno itself is a single, self-contained executable, easy to deploy or embed.
No node_modules: Its URL-based module system avoids complex dependency trees, simplifying custom builds.
Explicit Permissions: Granular control over file system, network, and environment access allows for secure, minimal deployments.
Built-in Tooling: Tools like deno compile (which we'll see) help create self-contained binaries.

WebAssembly (Wasm) Overview

WebAssembly (Wasm) is key to custom runtimes. It's a low-level binary instruction format that runs in modern web browsers and increasingly, on serverless platforms like Cloudflare Workers.

Wasm acts as a compilation target for many languages (Rust, C++, Go, AssemblyScript), allowing you to write high-performance code and run it securely and portably across different environments, including the edge.

Deno Loading Wasm Modules

Deno has built-in support for WebAssembly, allowing you to load and execute Wasm modules directly within your Deno applications. This extends Deno's capabilities far beyond JavaScript/TypeScript.

Here's a simple Deno script that loads and runs a small Wasm module designed to add two numbers:

const wasmCode = new Uint8Array([
  0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,
  0x01, 0x07, 0x01, 0x60, 0x02, 0x7f, 0x7f, 0x01,
  0x7f, 0x03, 0x02, 0x01, 0x00, 0x07, 0x07, 0x01,
  0x03, 0x61, 0x64, 0x64, 0x00, 0x00, 0x0a, 0x09,
  0x01, 0x07, 0x00, 0x20, 0x00, 0x20, 0x01, 0x6a,
  0x0b
]); // This Wasm adds two i32 numbers

async function runWasm() {
  const { instance } = await WebAssembly.instantiate(wasmCode);
  const addResult = instance.exports.add(5, 7);
  console.log(`Wasm add(5, 7) = ${addResult}`);
}

runWasm();

Wasm on Edge Platforms

Edge platforms like Cloudflare Workers embrace WebAssembly. You can compile code written in Rust, C++, or Go into Wasm and deploy it as a Worker.

This allows developers to leverage existing codebases, achieve near-native performance, and utilize specific language features that might not be available or efficient in JavaScript. It's a powerful way to create highly optimized edge functions.

Specialized Deno Deployments

While Deno Deploy offers a fantastic managed service, there are scenarios requiring specialized Deno deployments:

Self-Hosting Deno: Running Deno on your own infrastructure for full control over the environment.
Embedded Systems: Deploying Deno on resource-constrained edge devices with specific hardware requirements.
Custom Deno Builds: Compiling Deno from source with specific features enabled or disabled to meet unique needs, such as integrating custom native plugins or reducing binary size.

Building Custom Deno Runtimes

For truly custom Deno environments, you might compile Deno from its source code. This advanced technique allows you to:

Include specific Rust crates (libraries) directly within the Deno binary.
Remove unnecessary features to create a smaller, more focused runtime.
Target unusual architectures or operating systems not officially supported by standard Deno releases.

This approach is for highly specialized use cases where absolute control over the runtime is paramount.

Deno Compile for Edge Executables

Deno's deno compile command allows you to create a standalone executable from your Deno script. This executable includes the Deno runtime and your application code, making it portable.

While not a 'runtime environment' itself, a compiled Deno app is a highly specialized Deno deployment, perfect for edge devices that need self-contained, single-file applications without a separate Deno installation.

console.log("Hello from a Deno compiled app!");

if (Deno.args.length > 0) {
  console.log(`Arguments received: ${Deno.args.join(", ")}`);
}

// To compile this:
// deno compile --allow-read --allow-env my_app.ts

Summary of Benefits

Custom runtime environments and specialized Deno deployments offer significant benefits for advanced edge applications:

Enhanced Performance: Leverage Wasm or optimized native code.
Greater Flexibility: Use a wider range of languages and libraries.
Resource Efficiency: Tailor the environment to specific hardware or memory constraints.
Security: Fine-tune permissions and isolation.

These strategies empower developers to push the boundaries of what's possible at the edge.

Check Your Understanding

Which of the following are key reasons or capabilities enabled by using custom runtime environments or specialized Deno deployments at the edge?

Recap: Custom Edge Runtimes

In this lesson, we explored the concept of custom runtime environments and specialized Deno deployments for edge applications.

We saw how custom runtimes offer unparalleled control, enabling specific libraries, performance optimizations, and unique language support.
We learned about WebAssembly (Wasm) as a crucial technology for running high-performance, non-JS code at the edge, and how Deno can interact with it.
Finally, we discussed scenarios for specialized Deno deployments, including self-hosting and creating standalone executables with deno compile.

These advanced strategies empower you to build highly efficient and flexible edge solutions!

자주 묻는 질문

“사용자 지정 런타임 환경” 강의는 무료인가요?

네 — “사용자 지정 런타임 환경” 전체 내용을 이 웹사이트에서 무료로 읽을 수 있습니다. 인터랙티브하게 실습하려면(내장 코드 에디터와 24/7 AI 튜터), CoddyKit PRO로 업그레이드하면 Edge Computing with Cloudflare Workers & Deno 강의 전체를 잠금 해제할 수 있습니다. Edge Computing with Cloudflare Workers & Deno 강의에는 총 4개의 강의가 포함되어 있습니다.

“사용자 지정 런타임 환경”에서 뭘 배우나요?

엣지에서 사용자 지정 런타임 환경 또는 특수한 Deno 배포를 활용할 수 있는 방법을 이해합니다. 브라우저에서 직접 실행하는 실습 코드로 Edge Computing with Cloudflare Workers & Deno을(를) 배우며, 24/7 AI 튜터가 강의를 진행하면서 질문에 답변해줍니다.

Edge Computing with Cloudflare Workers & Deno을(를) 시작하는 데 경험이 필요한가요?

사전 경험은 필요하지 않습니다. CoddyKit의 Edge Computing with Cloudflare Workers & Deno은(는) 초급자부터 고급 학습자까지를 위해 구성되어 있으므로, 여기서 시작하거나 처음부터 시작할 수 있으며 자신의 속도대로 진행할 수 있습니다. 이것은 4개 중 2번째 강의입니다.

“사용자 지정 런타임 환경” 강의는 얼마나 걸리나요?

대부분의 CoddyKit 강의는 약 5~10분이 소요됩니다. 각 강의는 간결하고 인터랙티브하여 꾸준한 진행이 가능하며, 웹과 앱에서 중단한 부분부터 바로 시작할 수 있습니다.

이 Edge Computing with Cloudflare Workers & Deno 강의에서 코드를 작성하고 실행할 수 있나요?

네. 모든 Edge Computing with Cloudflare Workers & Deno 강의에는 내장 코드 에디터가 포함되어 있으므로, 브라우저에서 바로 실제 코드를 작성하고 실행한 후 즉시 AI 피드백을 받을 수 있습니다 — 로컬 설정이 필요 없습니다.

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