Building RESTful Services With Go and MongoDB

Building RESTful Services With Go and MongoDB

• 1.
  Building RESTful Services withGo and MongoDB Shiju Varghese GopherCon India 2015 20 February, 2015
• 2.
  ● Cloud SolutionsArchitect ● Gopher @shijucv https://github.com/shijuvar About Me
• 3.
  Outline ● Building HTTPServers in Go. ● Working with MongoDB using mgo. ● REST API Demo with Go and MongoDB.
• 4.
  Building HTTP Servers
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  net/http Package ● ProvidesHTTP client and server implementations. ● Allows you to build HTTP servers in Go. ● Provides composability and extensibility.
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  Processing HTTP Requests ●ServeMux - HTTP Request multiplexer (router). ● Handler - Serve HTTP Requests.
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  http.Handler Interface ● ServeHTTP Requests. ● Handlers are responsible for writing response headers and bodies. type Handler interface { ServeHTTP(ResponseWriter , *Request) }
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  HandlerFunc An adapter toallow the use of ordinary functions as HTTP handlers. type HandlerFunc func(ResponseWriter, *Request) func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request) { f(w, r) }
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  A Simple HTTPServer package main import ( "fmt" "net/http" ) func handler(w http.ResponseWriter, r *http.Request) { fmt.Fprint(w, "Hello, world!") } func main() { http.HandleFunc("/", handler) http.ListenAndServe (":8080", nil) }
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  Persistence with MongoDB
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  mgo (mango) ● MongoDBdriver for the Go. ● Written in Go. ● Created in 2010. ● Sponsored by MongoDB from 2011.
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  Connecting to MongoDB Dialestablishes a new session to the cluster of servers defined by the url parameter. session, err := mgo.Dial( "localhost") if err != nil { return err }
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  Working with Collections collection:= session.DB( "notesdb").C("notes") var notes []Note iter := collection.Find(nil).Iter() result := Note{} for iter.Next(&result) { notes = append(notes, result) } c := session.DB(database).C(collection) Querying against collections Accessing collections
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  Demo - RESTAPI with Go and MongoDB
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  Model type Note struct{ Id bson.ObjectId `bson:"_id" json:"id"` Title string `json:"title"` Description string `json:"description"` CreatedOn time.Time `json:"createdon"` }
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  Routing with gorilla/muxPackage r := mux.NewRouter() r.HandleFunc("/api/notes", NotesHandler).Methods( "GET") r.HandleFunc("/api/notes", CreateNoteHandler).Methods( "POST") r.HandleFunc("/api/notes/{id}" , UpdateNoteHandler).Methods( "PUT") r.HandleFunc("/api/notes/{id}" , DeleteNoteHandler).Methods( "DELETE")
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  Handler Functions func CreateNoteHandler(w http.ResponseWriter, r *http.Request) { } func NotesHandler(w http.ResponseWriter, r *http.Request) { } func UpdateNoteHandler (w http.ResponseWriter, r *http.Request) { } func DeleteNoteHandler (w http.ResponseWriter, r *http.Request) { }
• 18.
  Source Code https://github.com/shijuvar/gophercon-rest-demo
• 19.
  Thank You Github -https://github.com/shijuvar Twitter - https://twitter.com/shijucv Shiju Varghese