High Performance

web applications

in go

Andrew Bonventre



package main
import (  "fmt"  "log"  "net/http")
func main() {  http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {    w.Header().Set("Content-Type", "text/plain; charset=utf-8")    fmt.Fprintln(w, "Hello")  })  log.Fatal(http.ListenAndServe(":8080", nil))} 


That’s fine, but...

  • Templates
  • Routing
  • Forms
  • Caching
  • gzip
  • Sessions/Cookies
  • Security (XSRF/XSS)
  • Database ORM
  • ...

we need a Framework!

Revel (http://robfig.github.io/revel/)

frameworks are great...




...but don’t use them.


Provide 90% of what you need.

Can really suck to get that last 10%.

THE stdlib

Provides 90% of what you need.

Go’s compositional properties allow for swapping
out or enhancing components to fit your needs.


(from the golang-nuts mailing list...)
type gzipResponseWriter struct {

func (w gzipResponseWriter) Write(b []byte) (int, error) {
  return w.Writer.Write(b)

func makeGzipHandler(fn http.HandlerFunc) http.HandlerFunc {
  return func(w http.ResponseWriter, r *http.Request) {
    if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
      fn(w, r)      return
    w.Header().Set("Content-Encoding", "gzip")
      gz := gzip.NewWriter(w)
      defer gz.Close()
      fn(gzipResponseWriter{Writer: gz, ResponseWriter: w}, r)

That’s great, but...

I have to wrap all my handlers?

Seems tedious and inelegant.

Welp, I agree.

But it’s far better than generalizing too early.


type Handler interface {
  ServeHTTP(ResponseWriter, *Request)

Just pass in your own Handler
and gzip all requests with
Accept-Encoding: gzip

You can also do some other useful stuff in there...

useful stuff...

func (s *server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
  // Log every request...  log.Printf("%s %s %s %s", req.Proto, req.Method, req.RemoteAddr, req.URL)
// Track request latency to StatHat... defer func(t time.Time) { name := fmt.Sprintf("MyServer[%s][%s]", req.Method, req.URL.Path) stathat.PostEZValue(name, "...", time.Since(t).Seconds()*1000) }(time.Now()) ... gzip, let the muxer do its thing.}


Gorilla (http://www.gorillatoolkit.org/)



High Performance Web Applications in Go

By Andrew Bonventre

High Performance Web Applications in Go

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