Unfiltered Unveiled
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The slides of my introduction to Unfiltered, without the live coding session. ;-)
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Unfiltered Unveiled
- 1. Unfiltered Unveiled THE UNFRAMEWORK
- 2. Whoami Code / train Scala for a living Lately for a NYC startup Using Unfiltered Currently freelancer Former Xebia Former TomTom Former Sun Microstems Former ...
- 3. HTTP → GET / HTTP/1.1 Host: nxt.flotsam.nl ← HTTP/1.1 200 OK Date: Mon, 29 Oct 2012 … Last-Modified: Wed, 17 Accept: text/html … ETag: "4ce43eb8b40a4f…" Content-Type: text/html Content-Length: 9636 Server: AmazonS3
- 6. Toolkit Loosely coupled components that can be composed to solve Simple problems ☺ different problems Complex problems ☺
- 7. HTTP Stuff Stuff
- 8. HTTP Request Response
- 9. Web Appl. Request Response Request’ Response’ Request’’ Response’’ Request’’’ Response’’’
- 10. That rings a bell … match { case … => … case … => … case … => … case … => …
- 11. Pattern matching obj match { case i: Int => i * 2 case s: String => s + s }
- 12. Partial Function { case … => … case … => … case … => … case … => …
- 13. Example val duplicate: PartialFunction[Any,Any] = { case s: String => s + s case i: Int => i * 2 } duplicate(3) // 6 duplicate("yuk") // "yukyuk” duplicate(4.3) // MatchError
- 14. Unfiltered { Intent case _ => ResponseString(“yay”) } GET / HTTP/ HTTP/1.1 200 OK Content-Length: 3
- 15. Hitting the road import unfiltered.filter._ import unfiltered.jetty._ import unfiltered.response._ Http(8090).filter(Planify { case _ => ResponseString("Ok") }).run
- 16. ResponseFunction ① case … => … case … => … ~> … ~> … Ok Html(…) NotFound Html5(…) ResponseString(…) JsonContent Json(…) TextXmlContent ResponseWriter(…) Redirect(…)
- 17. ResponseFunction ② Ok ~> PlainTextContent ~> ResponseString("foo") Ok→ resp.setStatus(SC_OK) PlainTextContent→ resp.setContextType("text/plain") RepsonseString("foo")→ resp.setCharacterEncoding("UTF-8") val writer = resp.getWriter() writer.print("foo") writer.close
- 18. ResponseFunction ③ Ok ~> PlainTextContent ~> ResponseString("foo") NotFound ~> HtmlContent ~> Html(<html> <body>Not found</body> </html>) Redirect("/index.html")
- 19. Scalate Templates for Scala SSP <% val decks: List[Decks] %> SCAML <html> <body> Mustache <ul> … <% for (deck <- decks) { %> <li><%= deck.name%></li> <% } %> -@ val decks: List[Decks] </ul> %html </body> <html> %body </html> <body> %ul <ul> - for (deck <- decks) {{#decks}} %li= deck.name <li>{{name}}</li> {{/decks}}
- 20. SCAML In a Nutshell !!! <!DOCTYPE html PUBLIC "-//… %html <html> %body <body> .masthead <div class="masthead"/> #main <div id="main"/> %p(onclick="") YES <p onclick="">YES</p> :javascript <script language="javascript"/> :markdown *Nice* <p><em>Nice</em></p> </body> </html>
- 21. Extractors ① case … => … case … & … & … => … GET(…) Accept(…) POST(…) UserAgent(…) DELETE(…) Host(…) PUT(…) IfModifiedSince(…) Path(…) Referer(…)
- 22. Extractors ② case GET(_) case GET(Path(path)) case Path(Seg("give","me",something :: Nil)) (Matches "/give/me/money", setting something to "money".) case Path("/") & Params(params) case Accept("application/json")
- 23. Extractors ③ HttpRequest[A] → { case … => … } object DotJson { unapply[A](req: HttpRequest[A]) = req.uri.endsWith(".json") } case DotJson() => ResponseString("Json!")
- 24. QParams ☣ MONAD ALERT import unfiltered.request.QParams._ case req @ Params(params) => val expected = for { lat <- lookup("lat") is required("missing") lon <- lookup("lon") is required("missing") } yield { Ok ~> PlainTextContent ~> ResponseString("%s, %s".format(lat.get, lon.get)) } expected(params) orFail { failures => BadRequest ~> ResponseString(failures.mkString)
- 25. But wait, there's more - OAuth - Secure switch - Upload - Routing kit - Netty binding - Basic authentication - Web Sockets
- 26. Key takeaways Simple ☺ Retain control ☺ Used for real apps ☺ Hit the ground running ☺ Encode your own policies ☺ The source code is the documentation ⚇ Typesafe & extensible ☺☺☺ Vibe ☹
- 27. Questions? fl Wilfred Springer wilfred@flotsam.nl http://nxt.flotsam.nl/
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