Serve Files On Demand

files_on_demand.go

package main

import (
        "log"
        "net/http"
)

type Request struct {
        Filename   string
        ResultChan chan string
}

// process requests on background
func WorkerPool(n int) chan *Request {
        requests := make(chan *Request, n)

        for i := 0; i < n; i++ {
                go Worker(requests)
        }

        return requests
}

func Worker(requests chan *Request) {
        for request := range requests {
                // path := methodForFindingFiles()
                path := request.Filename
                request.ResultChan <- path
        }
}

type Server struct {
        Requests chan *Request
}

func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
        filename := req.URL.Query().Get("filename")
        request := &Request{Filename: filename, ResultChan: make(chan string)}
        s.Requests <- request
        path := <-request.ResultChan
        http.ServeFile(w, req, path)
}

func main() {
        requests := WorkerPool(5)
        server := &Server{Requests: requests}
        log.Fatal(http.ListenAndServe(":5000", server))
}