go-start @ Google DevFest Vienna 2012

Transcript

1. go-start A high level web-framework for Go Mittwoch, 14. November

   12

2. Goals • Create a high level web-framework for Go, like

   Django for Python or Rails for Ruby • Be Go-ish • Don’t make stuff more complicated than it has to be • Convention over configuration • Easy setup and deployment Mittwoch, 14. November 12

3. Current status • In development for over a year •

   Work sponsored by STARTeurope • Used in production for http://startuplive.in • Go v1.0 Mittwoch, 14. November 12

4. What’s in it? • MVC • Prefer Go syntax to

   template languages • HTML5 Boilerplate out of the box • MongoDB • All batteries included Mittwoch, 14. November 12

5. All batteries included • HTML5 Boilerplate • jQuery • External

   dependencies fetched automatically: go get -u github.com/ungerik/go-start Mittwoch, 14. November 12

6. Views Mittwoch, 14. November 12

7. Philosophy • Why learn another template language if you can

   use Go syntax? • DOM tree has a 1:1 Go object representation on the server • Every element has an ID to enable sync of DOM tree and server view representation Mittwoch, 14. November 12

8. Higher level abstractions •view.List •view.Table •view.Form •view.ModelView •view.If •view.Menu •view.Video

   •view.Page Mittwoch, 14. November 12

9. HTML Tags / Shortcuts •H1, H2, ... •P •Pre •A,

   A_blank •Img •Br •B, I, Q •Em, Strong •Ul, Ol Mittwoch, 14. November 12

10. So how does a view look like? Mittwoch, 14. November

    12

11. view := Views{ ! DIV("myclass", ! ! H1("Example HTML structure"),

    ! ! P("This is a paragraph"), ! ! P( ! ! ! HTML("Some unescaped HTML:<br/>"), ! ! ! Printf("The number of the beast: %d", 666), ! ! ! Escape("Will be escaped: 666 < 999"), ! ! ), ! ! A_blank("http://go-lang.org", "A very simple link"), ! ), ! Hr(), ! PRE("! <- pre formated text, followed by a list:"), ! UL("red", "green", "blue"), ! &Template{ ! ! Filename: "mytemplate.html", ! ! GetContext: func(ctx *Context) (interface{}, error) { ! ! ! return map[string]string{"Key": "Value"}, nil ! ! }, ! }, } Mittwoch, 14. November 12

12. Yes, templates are supported Mittwoch, 14. November 12

13. But I ended up using them only for the HTML5

    Boilerplate Page template Mittwoch, 14. November 12

14. Dynamic Views Mittwoch, 14. November 12

15. view := DynamicView( ! func(ctx *Context) (View, error) { !

    ! if ctx.Request.RequestURI == "/" { ! ! ! // return nil, so nothing will be rendered ! ! ! return nil, nil ! ! } ! ! return A("/", HTML("&larr; Back to the homepage")), nil ! }, ) Mittwoch, 14. November 12

16. HTML Pages Mittwoch, 14. November 12

17. Homepage := &Page{ ! OnPreRender: func(page *Page, context *Context) (err

    error) { ! ! context.Data = &PerPageData{...} // Set global page data at request context ! }, ! Title: func(context *Context, writer io.Writer) (err error) { ! ! writer.Write([]byte(context.Data.(*PerPageData).DynamicTitle)) ! ! return nil ! }, ! CSS: HomepageCSS, ! AdditionalHead: RSS("go-start.org RSS Feed", &RssFeed) ! Scripts: Renderers{ ! ! Config.Page.DefaultWriteScripts, ! ! JQuery, // jQuery/UI is built-in ! ! JQueryUI, ! ! JQueryUIAutocompleteFromURL(".select-username", IndirectURL(&API_Usernames), 2), ! ! GoogleAnalytics(GoogleAnalyticsID), // Google Analytics is built-in ! }, ! Content: Views{}, } Mittwoch, 14. November 12

18. URL structure Mittwoch, 14. November 12

19. var ( ! CSS View ! Homepage ViewWithURL ! ...

    ) func Paths() *ViewPath { ! return &ViewPath{View: Homepage, Sub: []ViewPath{ ! ! media.ViewPath("media"), ! ! {Name: "style.css", View: CSS}, ! ! ... ! }} } Mittwoch, 14. November 12

20. Models Mittwoch, 14. November 12

21. Models • Models are Go structs (marshaling via reflection) •

    Meta information for validation and display is added via tags • Forms and DB share the same model and validation mechanism • MongoDB is the default database Mittwoch, 14. November 12

22. FormModel Mittwoch, 14. November 12

23. Additional packages • Email (message creation missing in standard mail

    package + Google Mail defaults) • Gravatar • RSS parsing • Amiando event management (used by http://startuplive.in) Mittwoch, 14. November 12

24. Where to get it • go get github.com/ungerik/go-start • Tutorial:

    https://github.com/ungerik/go-start/tree/master/ examples/FullTutorial • Documentation: http://go.pkgdoc.org/github.com/ungerik/go-start Mittwoch, 14. November 12

25. The End Questions? • erik@erikunger.com • Twitter: @ungerik • Skype:

    ungerik Mittwoch, 14. November 12