eAddress.go

package main

import (
  
  "fmt"
  "os"
	"net/http"
  "html/template"
  "labix.org/v2/mgo"  
  "labix.org/v2/mgo/bson"  
  )

const (
MongoDBHosts = "dsxxxxxx.mongolab.com:xxxxxx"
AuthDatabase = "xxxxxx"
AuthUserName = "xxxxxxx"
AuthPassword = "xxxxxxxx"
TestDatabase = "xxxxxxxxxxx" 
)
  
type AddressData struct{
     name string `bson:"Name"`
     Email string `bson:"Email"`      
}

func main() {
  http.HandleFunc("/", root)
	http.HandleFunc("/display", display)
	fmt.Println("listening...")
        err := http.ListenAndServe(GetPort(), nil)
        if err != nil {
                panic(err)
        }
}
 
// Get the Port from the environment
func GetPort() string {
        var port = os.Getenv("PORT")
        // Set a default port if there is nothing in the environment
        if port == "" {
                port = "8080"
                fmt.Println("INFO: No PORT environment variable detected, defaulting to " + port)
        }
        return ":" + port
}
  

func root(res http.ResponseWriter, req *http.Request) {
        fmt.Fprint(res, rootForm)
}

const rootForm=
	
`<!doctype html>
<html>
    <head>
<style>
  body {background-color:blue}
  h1   {color:orange}
  h2   {color: yellow}
  p    {color: white}
legend {color: yellow}
</style>
        <title>TITLE - Fetch Some Data</title>
    </head>
    <body>
        <h1>Description - A simple app to fetch data from a cloud based document database</h1>
        <h2>Form Demo to retrieve e.mail address</h2>
        <form>
              <fieldset>
                        <legend>Enter the search criteria here, e.g. "Maxine":</legend>
                        <p>
                        <label>Name</label>
                       <form action="/display" method="post" accept-charset="utf-8" class="pure-form">
                              <input type="text" name="name" placeholder="name" />
                              <input type="submit" value=".. and query database!" formaction="/display"/>
                        </form>
                        </p>
              </fielsset>
        </form>              
    </body>
</html>`
	

var displayTemplate = template.Must(template.New("display").Parse(displayTemplateHTML))

func display(w http.ResponseWriter, r *http.Request) {
  
  mongoDBDialInfo := &mgo.DialInfo{
          Addrs: []string{MongoDBHosts},
          Database: AuthDatabase,
          Username: AuthUserName,
          Password: AuthPassword, 
    }
  
    mongoSession, err := mgo.DialWithInfo(mongoDBDialInfo)
    if err != nil {
      fmt.Println("error1")
    }
  
     mongoSession.SetMode(mgo.Monotonic, true) 

collection := mongoSession.DB(TestDatabase).C("AddressData") 
  
 var result AddressData

  err = collection.Find(bson.M{"Name": r.FormValue("name")}).One(&result)

if result.Email != "" {
                errn := displayTemplate.Execute(w, "The email id you wanted is: " + result.Email)
                if errn != nil {
                        http.Error(w, errn.Error(), http.StatusInternalServerError)
                }
        } else {
                displayTemplate.Execute(w, "Sorry... The email id you wanted does not exist.")
        }
}

const displayTemplateHTML = 
		`<!doctype html>
<html>
    <head>
<style>
  body {background-color:blue}
  h1   {color:orange}
  h2   {color: yellow}
  p    {color: white}
legend {color: yellow}
</style>
        <title>TITLE - Fetch Some Data</title>
    </head>
    <body>
        <h1>Description - A simple app to fetch data from a cloud based document database</h1>
        <h2>Form Demo to retrieve e.mail address</h2>
        <form>
              <fieldset>
                        <legend>Enter the search criteria here, e.g. "Maxine":</legend>
                        <p>
                        <p><b>{{html .}}</b></p>
                        <p><a href="/">Start again!</a></p>
                        </p>
              </fielsset>
        </form>              
    </body>
</html>`
	  
