How Can I Implement Partial Content Serving in Go for Seamless Audio Playback?

Partial Content Serving in Go: A Custom Approach

Enabling partial content serving allows HTML audio tags to seek and loop seamlessly. In Go, this functionality can be achieved without relying solely on the native ServeContent function.

Custom Implementation:

While ServeContent handles partial content effectively, it lacks flexibility for serving files from diverse sources. A custom implementation offers greater control over the process.

To implement partial content serving, you'll need to:

1. Create an io.ReadSeeker "view": This object stores the content to be served and provides an interface for accessing specific portions (bytes.Reader is a built-in implementation).
2. Implement io.ReadSeeker: If your content is not readily available as a []byte, you can implement a custom type that meets the io.ReadSeeker interface specifications (refer to the documentation for details).

Example:

Here's an example using a custom byte slice wrapper:

type MyBytesReader struct {
    b []byte
    currentPos int
}

func (m MyBytesReader) Read(p []byte) (n int, err error) {
    // Implement Read method to provide content based on current position
}

func (m MyBytesReader) Seek(offset int64, whence int) (int64, error) {
    // Implement Seek method to update current position
}

Once you have an io.ReadSeeker view, you can leverage the ServeContent function to handle the remaining complexity, including Range requests, MIME type setting, and If-Modified-Since requests.

This custom approach provides flexibility in serving partial content from various sources, giving you greater control over your server behavior.

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