twins-upstream/serve_fcgi.go

package main

import (
	"bytes"
	"io"
	"io/ioutil"
	"log"
	"net"
	"net/http"
	"net/url"

	"github.com/yookoala/gofast"
)

type responseWriter struct {
	io.WriteCloser
	header http.Header
}

func newResponseWriter(out io.WriteCloser) *responseWriter {
	return &responseWriter{
		WriteCloser: out,
		header:      make(http.Header),
	}
}

func (w *responseWriter) Header() http.Header {
	return w.header
}

func (w *responseWriter) WriteHeader(statusCode int) {
	// Do nothing
}

func serveFastCGI(c net.Conn, connFactory gofast.ConnFactory, u *url.URL, filePath string) {
	header := map[string][]string{
		"Accept": {"*/*"},
		"Host":   {u.Hostname()},
	}

	r := &http.Request{
		Method:     "GET",
		URL:        u,
		Proto:      "HTTP/1.1",
		ProtoMajor: 1,
		ProtoMinor: 1,
		Header:     header,
		Body:       ioutil.NopCloser(bytes.NewReader(nil)),
		Host:       u.Host,
	}

	gofast.
		NewHandler(
			gofast.NewFileEndpoint(filePath)(gofast.BasicSession),
			gofast.SimpleClientFactory(connFactory, 0),
		).
		ServeHTTP(newResponseWriter(c), r)

	if verbose {
		log.Printf("< exec %s\n", filePath)
	}
}