Deploying a WASM App on OSC My Apps with Codex
The author tried deploying a WASM-based Pixel Art Generator on OSC My Apps using Codex and the OSC MCP Connector. While the deployment process was smooth, the author faced compatibility issues with OSC's runtime, leading to changes in the app's behavior.
Why it matters
This article highlights the challenges of deploying WASM-based applications on platforms like OSC, which can impact the original application structure and behavior.
Key Points
- 1The author built a simple HTTP API in Rust and compiled it to WASM
- 2Codex handled the deployment process well, but the WASM module was not compatible with OSC's runtime
- 3The author had to refactor the app to remove Spin and use a generic WASM execution endpoint instead
- 4The refactored app worked, but the original API endpoints could not be preserved
Details
The author explored using WebAssembly (WASM) as a backend runtime, which offers benefits like fast startup, lightweight deployment, and secure sandboxing. They built a Pixel Art Generator app in Rust and compiled it to WASM. The local development process with tools like Spin went smoothly, but when deploying the app to OSC My Apps using Codex, the author encountered compatibility issues. The WASM module generated by Spin was not compatible with OSC's runtime, causing the API endpoints to not function as expected. To work around this, the author had to refactor the app to remove Spin entirely and use a generic WASM execution endpoint instead. While the deployment was successful, the original API structure could not be preserved. The author found that there is still a gap between building locally with tools like Spin and deploying to platforms like OSC, which requires further understanding of the runtime expectations.
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