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WebAssembly auf dem Server und in der Cloud mit Fermyon Spin

WebAssembly auf dem Server und in der Cloud mit Fermyon Spin

WebAssembly (Wasm) ändert alles! Dabei ist Wasm im Browser nur die Spitze des Eisbergs. Die Auswirkungen von Wasm auf der Serverseite (oder in der Cloud) werden sich bald wesentlich stärker darauf auswirken, wie wir Anwendungen implementieren, verteilen und ausführen. In diesem Talk führt Sie Cloud-Native-Enthusiast Thorsten Hans durch die zugrundeliegenden Ideen, erklärt essenzielle Konzepte wie WASI und WAGI und veranschaulicht die Bausteine, mit denen Sie Ihre WebAssembly-Reise starten können. Gemeinsam tauchen wir in Spin ein, ein SDK, eine Laufzeit und eine Entwickler-Toolchain, welche von Fermyon erstellt wurde, und lernen Microservices mit Wasm zu erstellen.

Thorsten Hans

May 09, 2023

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  1. WebAssembly auf dem Server und in der Cloud Thorsten Hans

    @ThorstenHans Cloud-Native Consultant mit Fermyon Spin
  2. WebAssembly (Wasm) • It’s virutal machine that processes stack-based instructions

    • Instruction are in binary format • High performance runtime that devs can target using “almost” every language* * https://www.fermyon.com/wasm-languages/webassembly-language-support Introduction
  3. WebAssembly (Wasm) • Fast 🏃 • Near native execution performance,

    leveraging available hardware capabilities • Safe 💪 • Wasm is a sandboxed, memory-safe execution environment • Portable 🧊 • All major browsers support Wasm & multiple ”server” Wasm runtimes available Introduction
  4. WebAssembly System Interface (WASI) • Platform Integration 🧬 • WASI

    is a wrapper for underlying platform (OS) capabilities • Think of things like File:: open() • Portable 🧊 • WASI could become the default compiling target for EVERYONE! • Secure 👮 • Permissions can be defined per app (module) Introduction
  5. WebAssembly Gateway Interface (WAGI) • Use WebAssembly modules as HTTP

    handlers • Think of a hyper-focused microservices runtime • Comman Gateway Interface (CGI) implementation • HTTP headers become environment variables • HTTP payloads are piped to stdin • HTTP responses must be written to stdout Introduction
  6. • Cloud-vendor interest: • They can put more apps on

    a compute resource as today • Wasm and WASI give them a strict security and isolation model • Wasm workloads are way smaller than everything else • They can scale to zero due to super-fast bootstrapping Intro Why will Wasm have such a big impact?
  7. • Developer interest: • We can use any language that

    compiles to wasm32_wasi • We can ship just the app (not the webserver, not the OS) • We can reduce cloud spendings • Workloads will be cheaper because they consume way less resources and execute faster Intro Why will Wasm have such a big impact?
  8. Wasm on the server relates to containers in the same

    way containers related to virtual machines 10+ years ago
  9. Fermyon Spin is: • A serverless runtime build using Wasm,

    WASI, and the WebAssembly Component Model (leveraging wasmtime internally) • A collection of SDKs for many popular languages • A super focussed developer tooling Intro Let’s get everybody on track! 🦀
  10. • Spin provides triggers that the runtime uses to invoke

    our code • The runtime instantiates our Wasm Module and invokes our code • Currently, Spin provides the following triggers • HTTP • Publish / Subscribe Let’s meet Fermyon Spin Triggers & Outputs
  11. Outputs allow our code to interact with the surrounding world

    • Databases (SQLite, MySQL & PostgreSQL) • Key-Value Storage (SQLite, Redis) • Publish / Subscribe (Redis Channels) • Outbound HTTP Let’s meet Fermyon Spin Triggers & Outputs
  12. • Considering Fermyon Spin, try to spot reactive parts of

    your application • Check if necessary libraries are available for the wasm32_wasi platform • Deploy Fermyon Platform to your infrastructure of trust Intro How to adopt Wasm on the server / in the cloud
  13. Regardless of whether we must invoke backend APIs or 3rd

    party endpoints, Outbound HTTP is an easy to grasp, yet important capability provided by the Spin SDK. Patterns & Practices Outbound HTTP
  14. Configurability is mission-critical when building software that is executed in

    different environments. Spin apps are no exception here. We must use proper mechanisms to deal with sensitive and non-sensitive configuration data. Patterns & Practices Configuration Management
  15. • The Spin Manifest spin.toml is the center of gravity.

    All configuration aspects are defined here. • We use variables to specify non-sensitive configuration data • For sensitive configuration data, we can use HashiCorp Vault • We link HashiCorp Vault to our app using a runtime-config file Patterns & Practices Configuration Management
  16. • Publish is achieved using the Spin SDK • Constructing

    messages is up to us, which means we can modernize (read: replace containers) with ease, using cloudevents or by mimicking existing messages • When subscribing to messages, we must implement filters on our own Patterns & Practices Publish / Subscribe
  17. • With Spin, Fermyon demonstrates how WebAssembly will change the

    way we build software for the next wave of cloud-computing • We’re able to combine best from both worlds, Containers and WebAssembly to build distributed architectures for the upcoming years • Available Spin SDKs and plain WAGI support makes it super easy to get started (using any language that compiles to Wasm) Conclusion
  18. • Hyperscalers want Wasm to drive hardware utilization, lift smaller

    application packages, get proper isolation and security in place and scale horizontally to and from 0 without facing the dilemma of cold-start times (Looking at you, Azure Functions *scnr*). • Application developers on the otherside had to tacklequite some pitfalls to adopt Wasm (SDKs., dev tooling, etc) • From my point of view, Fermyon is able to close the gap and drive Wasm adoption on the server and in the cloud to whole new level Conclusion