How Can I Serve Static Files from Memory in a Go Application?

Serving Static Files from Memory in Go

When deploying a Go application, it can be tedious to include static files like CSS and JavaScript in your deployment package. To simplify this process, this article explores an alternative approach: baking these static files directly into the application binary and serving them from memory.

Implementing a Custom FileSystem

The standard FileServer handler requires a FileSystem object, typically created using http.Dir to represent the underlying file system. However, by implementing your own FileSystem, you can serve files from memory.

The provided code demonstrates this custom FileSystem implementation (InMemoryFS) with two functions: Open and LoadFile. Open retrieves the file from the memory map, and LoadFile constructs an InMemoryFile object with the necessary information.

Implementing the http.File Interface

To support serving files from memory, the InMemoryFile type implements the http.File interface. It includes methods for closing, retrieving file information, reading, and seeking within the file.

Integrating with the FileServer

Once the custom FileSystem is defined, you can use it with the FileServer handler as usual. The example code initializes the InMemoryFS, loads the static files into memory, and sets up the FileServer with the custom FileSystem.

Note: While the provided implementation works for basic static file serving, it has some limitations and is not recommended for production use. Consult the provided reference for a more robust solution.

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