github.com/snabb/lazybytes
Package lazybytes implements a bytes.Reader which is initialized lazily. Otherwise it performs exactly like bytes.Reader. The constructor takes a function which is called to perform initialization when the Reader is accessed first time. This may be useful with http.ServeContent. By wrapping your content template rendering in lazybytes.Reader the rendering will be skipped if the content is not needed (for example if the client makes an If-Modified-Since request).
Readme
The Go package lazybytes implements a bytes.Reader which is initialized lazily on first access.
Documentation:
https://godoc.org/github.com/snabb/lazybytes
Simple example:
f := func() []byte {
fmt.Println("initializing")
return []byte("hello world\n")
}
lr := lazybytes.NewReader(f)
fmt.Println("not yet initialized")
fmt.Println("len =", lr.Len())
lr.WriteTo(os.Stdout)
// Output:
// not yet initialized
// initializing
// len = 12
// hello world
The Git repository is located at: https://github.com/snabb/lazybytes
MIT
FAQs
Package lazybytes implements a bytes.Reader which is initialized lazily. Otherwise it performs exactly like bytes.Reader. The constructor takes a function which is called to perform initialization when the Reader is accessed first time. This may be useful with http.ServeContent. By wrapping your content template rendering in lazybytes.Reader the rendering will be skipped if the content is not needed (for example if the client makes an If-Modified-Since request).
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