#go

Sempat gagal Create Tulisan gara-gara mengubah struct Blog, solusinya insert tidak lagi menggunakan Blog tapi langsung ke Bson.M{} object saja.

#webkoe #go #mgo

1. Create Environment
    conda create --name snakes python=3
2. Aktifkan dengan
    activate snakes

Instalasi di #windows :
- Windows 10
- Go versi 1.5
- Git

Pastikan Go berjalan lancar, terutama untuk menjalankan perintah "go get" ... :)

1. Install gomobile dengan perintah
    go get golang.org/x/mobile/cmd/gomobile
    Keterangan :
    - proses ini akan menghasilkan gomobile.exe yang akan tersimpan di $GOPATH\bin
    - di windows, file exe ini tidak bisa langsung dijalankan secara global
    - jadi, harus diregister dulu ke environment variable-nya windows
    - kalo ngga mau capek ya copy aja ke folder project, hehe.

3. Pastikan command "gomobile" berjalan lancar jaya
2. Masuk ke folder yang ditentukan (bebas)
3. Lalu jalankan perintah "gomobile init", it might take a few minutes ... or hours ? T_T

script .go
for k2, v2 := range v1 {
    fmt.Println(k2)
    fmt.Println(v2)
}
error :
.\retrieve_mongo.go:92: cannot range over v1 (type interface {})

script .go
for k2, v2 := range v1.(bson.M) {
    fmt.Println(k2)
    fmt.Println(v2)
}

Install go1.5 di #webkoe dengan #gvm.
- gvm use go1.4 
- export GOROOT_BOOTSTRAP=$GOROOT 
- gvm install go1.5

Dari kemaren sore, sampe dini hari ini dipusingkan
sama arraynya #go. Bentuk seperti ini : 

[
   [ {"title":"OK"} , {"title":"WELL"} ]
] 

tidak bisa langsung dikonsumsi sama contoh script 
di #ebook nya #addyosmani. 

Yang diinginkan adalah bentuk 2 objectnya 
langsung (up 1 level) yaitu :

[ {"title":"OK"} , {"title":"WELL"} ]

#problemsolve nya sementara ini di #go adalah,
mengubah type struct ke type string

Nyoba compile ke windows 32 bit, semua berjalan lancar, kecuali CSS external yang tidak terload ... #error #go #project

Padahal di 64 lancar jaya ...

Issue yang mirip di stackoverflow

Ternyata go compiler bisa mengcompile lintas OS dan ARCH (arsitektur prosessor, 32 atau 64 bit). GO di komputer ane bermasalah saat akan melakukan kompilasi lintas OS dan ARCH, ini nyoba install ulang GO, dari sourcenya langsung, untuk itu perlu compiler gcc Petunjuknya

Misal saat ini saya sedang ada di folder Chat.
Isi foldernya :
/Chat :
- main.go    = package main
- client.go  = package main
- room.go    = package main

dengan command berikut :
go build -o chat.exe

akan menghasilkan file chat.exe yang ready, hasilnya :

/Chat :
- main.go
- client.go
- room.go
- chat.exe   = Hasilnya

catatan :
"chat.exe" boleh diisi dengan nama apapun.
Hasilnya nanti akan menjadi binary/executable

package config

import(
	"encoding/json"
	"os"
	"fmt"
)

var (

    // Path
    // TemplatePath      = "D:\\PROJECTS\\GO-APP\\sms.0.01\\templates\\"
    // PublicPath		  = "D:\\PROJECTS\\GO-APP\\sms.0.01\\public\\"
    UploadPath		  = "D:\\PROJECTS\\GO-APP\\sms.0.01\\public\\files\\"
    PDFPath			  = "D:\\PROJECTS\\GO-APP\\sms.0.01\\public\\pdf\\"
    ImagesLogoPath 	  = "D:\\PROJECTS\\GO-APP\\sms.0.01\\public\\images\\depkeu.png" // PDF Generator | logo depkeu disposisi suratmasuk
    
    // Tahun Nomor Agenda
    TahunAgendaSMS	  = "2015"

)

type Configuration struct {
    Port string
    TemplatePath string
    PublicPath string
}


func Port() string {
	file, _ := os.Open("C:\\DWConf\\config.json")
	decoder := json.NewDecoder(file)
	configuration := Configuration{}
	err := decoder.Decode(&configuration)
	if err != nil {
	  fmt.Println("error:", err)
	}
	// fmt.Println() // output: [UserA, UserB]
	return configuration.Port
}

func TemplatePath() string {
	file, _ := os.Open("C:\\DWConf\\config.json")
	decoder := json.NewDecoder(file)
	configuration := Configuration{}
	err := decoder.Decode(&configuration)
	if err != nil {
	  fmt.Println("error:", err)
	}
	return configuration.TemplatePath
}

func PublicPath() string {
	file, _ := os.Open("C:\\DWConf\\config.json")
	decoder := json.NewDecoder(file)
	configuration := Configuration{}
	err := decoder.Decode(&configuration)
	if err != nil {
	  fmt.Println("error:", err)
	}
	return configuration.PublicPath
}

Sebelum 
"tag" : [
          {
            "created_by" : "auto",
            "created_from" : "::1",
            "nama" : "ARIEF YANUAR",
            "kode_jabatan" : "01",
            "nama_jabatan" : "Kepala Kantor Wilayah DJP Kalimantan Selatan dan Tengah",
            "nomor_agenda" : 2,
            "tanggal_disposisi" : "2015-04-29 10:03:21.7417571 +0800 SGT",
            "tanggal_terima" : "2015-04-29 10:03:21.7417571 +0800 SGT"
          }
        ],

Planningnya 
"tag" : {
        "01" : {
            "created_by" : "auto",
            "created_from" : "::1",
            "nama" : "ARIEF YANUAR",
            "kode_jabatan" : "01",
            "nama_jabatan" : "Kepala Kantor Wilayah DJP Kalimantan Selatan dan Tengah",
            "nomor_agenda" : 2,
            "tanggal_disposisi" : "2015-04-29 10:03:21.7417571 +0800 SGT",
            "tanggal_terima" : "2015-04-29 10:03:21.7417571 +0800 SGT"
        }
    },

JAVASCRIPT
{
	"kodejabatan":"01",
	"listsurat":[
			{
				"Tanggal":"08/04/2015",
				"Asal":"KPP Pratama Banjarmasin",
				"Hal":"Laporan",
				"Nomor":"S-123/WPJ.29/KP.01/2015",
				"Tag":
					[{
						"created_by":"auto",
						"kode_jabatan":"01",
						"nama":"MEKAR SATRIA UTAMA",
						"nama_jabatan":"Kepala Kantor Wilayah DJP Kalimantan Selatan dan Tengah",
						"nomor_agenda":1,
						"tanggal_disposisi":"2015-04-10 09:16:38.0569814 +0800 SGT",
						"tanggal_terima":"2015-04-10 09:16:38.0569814 +0800 SGT"
					},
					{
						"created_by":"01",
						"kode_jabatan":"01.02",
						"nama":"MUH. ARIEF ZUSNIANTO",
						"nama_jabatan":"Kepala Bidang Dukungan Teknis dan Konsultasi",
						"nomor_agenda":1,
						"tanggal_disposisi":"2015-04-10 09:16:53.9328976 +0800 SGT"
					},
					{
						"created_by":"01",
						"kode_jabatan":"01.04",
						"nama":"HENNY SUATRI SUARDI",
						"nama_jabatan":"Kepala Bidang Kerjasama dan Ekstensifikasi Perpajakan",
						"nomor_agenda":1,
						"tanggal_disposisi":"2015-04-10 09:35:56.3725057 +0800 SGT"
					},
					{
						"created_by":"01",
						"kode_jabatan":"99",
						"nama":"%!s(\u003cnil\u003e)",
						"nama_jabatan":"Fungsional",
						"nomor_agenda":1,
						"tanggal_disposisi":"2015-04-10 09:41:45.4615867 +0800 SGT"
					},
					{
						"created_by":"01",
						"kode_jabatan":"01.06",
						"nama":"\u003cnil\u003e",
						"nama_jabatan":"Kepala Bidang Pengurangan Keberatan dan Banding",
						"nomor_agenda":1,
						"tanggal_disposisi":"2015-04-10 09:43:13.1716407 +0800 SGT"
					}]
				,"Doc_series":"BLw2DLPAM"
			}
		],
	"username":"kakanwil"
}

INTERFACE{} GO

{"kodejabatan":"01","listsurat":[{"Tanggal":"08/04/2015","Asal":"KPP Pratama Ban
	jarmasin","Hal":"Laporan","Nomor":"S-123/WPJ.29/KP.01/2015","Tag":[{"created_by"
	:"auto","kode_jabatan":"01","nama":"MEKAR SATRIA UTAMA","nama_jabatan":"Kepala K
	antor Wilayah DJP Kalimantan Selatan dan Tengah","nomor_agenda":1,"tanggal_dispo
	sisi":"2015-04-10 09:16:38.0569814 +0800 SGT","tanggal_terima":"2015-04-10 09:16
	:38.0569814 +0800 SGT"},{"created_by":"01","kode_jabatan":"01.02","nama":"MUH. A
	RIEF ZUSNIANTO","nama_jabatan":"Kepala Bidang Dukungan Teknis dan Konsultasi","n
	omor_agenda":1,"tanggal_disposisi":"2015-04-10 09:16:53.9328976 +0800 SGT"},{"cr
	eated_by":"01","kode_jabatan":"01.04","nama":"HENNY SUATRI SUARDI","nama_jabatan
	":"Kepala Bidang Kerjasama dan Ekstensifikasi Perpajakan","nomor_agenda":1,"tang
	gal_disposisi":"2015-04-10 09:35:56.3725057 +0800 SGT"},{"created_by":"01","kode
	_jabatan":"99","nama":"%!s(\u003cnil\u003e)","nama_jabatan":"Fungsional","nomor_
	agenda":1,"tanggal_disposisi":"2015-04-10 09:41:45.4615867 +0800 SGT"},{"created
	_by":"01","kode_jabatan":"01.06","nama":"\u003cnil\u003e","nama_jabatan":"Kepala
	 Bidang Pengurangan Keberatan dan Banding","nomor_agenda":1,"tanggal_disposisi":
	"2015-04-10 09:43:13.1716407 +0800 SGT"}],"Doc_series":"BLw2DLPAM"}],"username":
	"kakanwil"}

	Type ==> suratmasuk.Response aka interface{}

        /*
        // JSON
        w.Header().Set("Content-Type", "application/json")
        fmt.Fprint(w, finalResult)
        return
        */

{{define "title"}}
		Home
	{{end}}

	{{define "username"}}
		{{.username}}
	{{end}}

	{{define "body"}}
		
		{{ $kodejabatan := .kodejabatan }}
		
		Input 


		<table border="1">
			
				Mode
				<th colspan="2">Agenda
				Asal
				Nomor
				Tanggal
				Hal
			

			{{ range .listsurat}}
				
					Detail
					
						{{ range .Tag}}
							{{ if eq .kode_jabatan $kodejabatan}}
								{{.nomor_agenda}}
								{{.tanggal_disposisi | formatwaktu}}
							{{ end }}
						{{ end }}

					{{ .Asal}}
					{{ .Nomor}}
					{{ .Tanggal}}
					{{ .Hal}}
				
			{{ end }}


		

	{{end}}

- Admin Login
- Admin Logout
- Admin User
- Admin Jabatan

Session : OK
MongoDB : OK

- Pecah sms-server ke package-package
- Rapikan Folder Templates

switch r.Method {
   case "GET":
       // Serve the resource.
   case "POST":
       // Create a new record.
   case "PUT":
       // Update an existing record.
   case "DELETE":
       // Remove the record.
   default:
       // Give an error message.
}

package main

  import (
      "fmt"
      "github.com/gorilla/mux"
      "github.com/gorilla/sessions"
      // "github.com/fzzy/radix/redis"
      // "github.com/fatih/structs"
      "net"
      "net/http"
      "html/template"
      "gopkg.in/mgo.v2"         
      "gopkg.in/mgo.v2/bson"
      "regexp"
      "strings"
      "crypto/rand"
      "time"
      "strconv"
      // "encoding/json"
      // "reflect"
  )

  var (
      // MongoDB
      mongoConfig       = "mongodb://localhost:27017/admin"
      MongoSession, err = mgo.Dial(mongoConfig)
      MDB               = MongoSession.DB("admin")
      BlogCol           = MDB.C("blog")
      UserCol           = MDB.C("user")

      // Session
      store             = sessions.NewCookieStore([]byte("something-very-secret"))

      // Blog
      skipHome          = 0
      limit             = 10
      rowsNum           = 10

      // Tag Factory
      tagPattern        = "#([a-z]|[A-Z]|[_])+"

      // Path
      templatePath      = "D:\\PROJECTS\\GO-APP\\webkoe\\templates\\"
      publicPath        = "D:\\PROJECTS\\GO-APP\\webkoe\\public\\"
  )

  func cekKodeJabatan(r *http.Request) string {
      session,_       := store.Get(r, "session-name")
      kode_jabatan    := fmt.Sprintf("%s", session.Values["kode_jabatan"])
      return kode_jabatan  
  }

  func SmsHomeHandler(w http.ResponseWriter, r *http.Request) {

      if cekKodeJabatan(r) == "" {
          http.Redirect(w, r, "/login", 301)
          fmt.Println(cekKodeJabatan(r))
          fmt.Println("*** @home -> No Data ")
      }else{
          templates := template.Must(template.New("").ParseFiles(templatePath + "sms-base.html", templatePath + "sms-home.html"))
          err := templates.ExecuteTemplate(w, "base", cekKodeJabatan(r))
          if err != nil {
              http.Error(w, err.Error(), http.StatusInternalServerError)
          }        
      }
  }

  func SmsLoginFormHandler(w http.ResponseWriter, r *http.Request) {

      if cekKodeJabatan(r) == "" {
          templates := template.Must(template.New("").ParseFiles(templatePath + "sms-base.html", templatePath + "sms-loginform.html"))
          err := templates.ExecuteTemplate(w, "base", nil)
          if err != nil {
              http.Error(w, err.Error(), http.StatusInternalServerError)
          }
      }else{
          http.Redirect(w, r, "/", 301)
      }
  }  

  func SmsPostLoginHandler(w http.ResponseWriter, r *http.Request) {
      
      if cekKodeJabatan(r) == "" {
          username          := r.FormValue("username")
          password          := r.FormValue("password")

          var results map[string]interface{}
          err = UserCol.Find(bson.M{"username": username, "password" : password}).One(&results)
          if err != nil {
              http.Redirect(w, r, "/#error", 301)
          }else{
              kode_jabatan, _ := results["kode_jabatan"]
              session, _                     := store.Get(r, "session-name")
              session.Values["kode_jabatan"]  = kode_jabatan
              session.Save(r, w)
              http.Redirect(w, r, "/", 301)
          }
      }else{
          http.Redirect(w, r, "/", 301)
      }
  }

  func SmsLogoutHandler(w http.ResponseWriter, r *http.Request) {
      
      session, _                     := store.Get(r, "session-name")
      session.Values["kode_jabatan"]  = ""
      session.Save(r, w)

      http.Redirect(w, r, "/", 301)
  }

  func safehtml(text string) template.HTML { 

      text = text + " "
      text = strings.Replace(text, "<", "<", -1)   
      text = strings.Replace(text, ">", ">", -1) 
        
      text = strings.Replace(text, "", "

", "", -1) text = strings.Replace(text, "", "", -1) text = strings.Replace(text, "", "", -1) text = strings.Replace(text, "", "", -1) text = strings.Replace(text, "", "", -1) text = strings.Replace(text, "", "", -1) text = strings.Replace(text, "=", "=", -1) text = strings.Replace(text, "<a href=", "", "", -1) text = strings.Replace(text, "<img src=", "", ">", -1) regexPagar, _ := regexp.Compile(tagPattern) tags := regexPagar.FindAllString(text, -1) for _ , value := range tags { tagAscii := strings.Replace(value, "#", "#", 1) tagOnly := strings.Replace(value, "#", "", 1) text = strings.Replace(text, value, "" + tagAscii + "", 1) } return template.HTML(text) } func timeFormatter(text string) template.HTML { text = strings.Replace(text, " ", "-", -1) text = strings.Replace(text, ":", "-", -1) split := strings.Split(text, "-") tahun, _ := strconv.Atoi(split[0]) bulan, _ := strconv.Atoi(split[1]) tanggal, _ := strconv.Atoi(split[2]) jam, _ := strconv.Atoi(split[3]) menit, _ := strconv.Atoi(split[4]) detik, _ := strconv.Atoi(split[5]) var _bulan time.Month if bulan == 1 { _bulan = time.January }else if bulan == 2 { _bulan = time.February }else if bulan == 3{ _bulan = time.March }else if bulan == 4{ _bulan = time.April }else if bulan == 5{ _bulan = time.May }else if bulan == 6{ _bulan = time.June }else if bulan == 7{ _bulan = time.July }else if bulan == 8{ _bulan = time.August }else if bulan == 9{ _bulan = time.September }else if bulan == 10{ _bulan = time.October }else if bulan == 11{ _bulan = time.November }else if bulan == 12{ _bulan = time.December } // const layout = "Mon Jan 2, 2006 at 3:04pm (MST)" (MST) --> WITA const layout = "Mon, 2 Jan 2006 3:04 pm" t := time.Date(tahun, _bulan, tanggal, jam, menit, detik, 0, time.Local) return template.HTML(t.Format(layout)) } func randStr(strSize int, randType string) string { var dictionary string if randType == "alphanum" { dictionary = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" } if randType == "alpha" { dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" } if randType == "number" { dictionary = "0123456789" } var bytes = make([]byte, strSize) rand.Read(bytes) for k, v := range bytes { bytes[k] = dictionary[v%byte(len(dictionary))] } return string(bytes) } func GetIP(r *http.Request) string { if ipProxy := r.Header.Get("X-FORWARDED-FOR"); len(ipProxy) > 0 { return ipProxy } ip, _, _ := net.SplitHostPort(r.RemoteAddr) return ip } func main() { mx := mux.NewRouter() // *** home *** mx.HandleFunc("/", SmsHomeHandler) // *** login *** mx.HandleFunc("/login", SmsLoginFormHandler).Methods("GET") mx.HandleFunc("/login", SmsPostLoginHandler).Methods("POST") // *** logout *** mx.HandleFunc("/logout", SmsLogoutHandler).Methods("GET") // *** static server *** mx.PathPrefix("/").Handler(http.FileServer(http.Dir( publicPath ))) http.ListenAndServe(":80", mx) } #go #script

Was it worth it?

Yes, a million times, yes. The speed boost is just too good to pass up. Also, and this counts for something I think, Go is a trendy language right now, so when it comes to recruiting, I think having Go as a critical part of Repustate’s tech stack will help.

      func safehtml(text string) template.HTML { 

          text = text + " "
          text = strings.Replace(text, "<", "<", -1)   
          text = strings.Replace(text, ">", ">", -1) 
            
          text = strings.Replace(text, "
", "
", -1) 
          text = strings.Replace(text, "
", "
", -1) 

          regexPagar, _ := regexp.Compile(tagPattern)
          tags          := regexPagar.FindAllString(text, -1)

          for _ , value  := range tags {
            
            tagAscii  := strings.Replace(value, "#", "#", 1)
            tagOnly   := strings.Replace(value, "#", "", 1)
            text = strings.Replace(text, value, "" + tagAscii + "", 1)
          }

          return template.HTML(text) 
      }

      func WkListHandler(w http.ResponseWriter, r *http.Request) {
          funcMap := template.FuncMap{
              "safehtml": safehtml ,
          }
          templates := template.Must(template.New("").Funcs(funcMap).ParseFiles(templatePath + "webkoe-base.html", templatePath + "webkoe-list.html"))
          
          var results []Blog
          err = MCol.Find(bson.M{}).Sort("-date").Limit(1000000000000).All(&results)
          if err != nil {
              panic(err)
          }

          // var finalResult []tagView
          // fmt.Println(reflect.TypeOf(results))
          err := templates.ExecuteTemplate(w, "base", results)
          if err != nil {
              http.Error(w, err.Error(), http.StatusInternalServerError)
          }
      }

- Ubuntu :
  Awal    PATH="/root/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
  
  root@webkoe:~# export PATH=$PATH:/root/go/bin
  
  Menjadi PATH="/root/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/root/go/bin"

- Windows :
  Awal Path=C:\Python27\;C:\Python27\Scripts;D:\oracle\product\11.1.0\db_1\bin;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;
  C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;D:\PROJECTS\NODEAPP\Nodejs\;D:\PROJECTS\WEB\xampp\php;
  C:\Program Files\MongoDB 2.6 Standard\bin;C:\ProgramData\ComposerSetup\bin;C:\dart\dart-sdk\bin;D:\PROJECTS\GO\bin;
  C:\Program Files (x86)\Git\cmd;C:\Ruby21-x64\bin;C:\Users\lou\AppData\Roaming\npm
  
  C:\Users\lou>set PATH=%PATH%;D:\PROJECTS\GO\bin

  Menjadi Path=C:\Python27\;C:\Python27\Scripts;D:\oracle\product\11.1.0\db_1\bin;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;
  C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;D:\PROJECTS\NODEAPP\Nodejs\;D:\PROJECTS\WEB\xampp\php;
  C:\Program Files\MongoDB 2.6 Standard\bin;C:\ProgramData\ComposerSetup\bin;C:\dart\dart-sdk\bin;D:\PROJECTS\GO\bin;
  C:\Program Files (x86)\Git\cmd;C:\Ruby21-x64\bin;C:\Users\lou\AppData\Roaming\npm;D:\PROJECTS\GO\bin

Ane awalnya rumit sekali mikirnya ... syukurlah ketemu link ini 
http://stackoverflow.com/questions/17306358/golang-removing-fields-from-struct-or-hiding-them-in-json-response

Ternyata cukup serahkan pada map[string]interface{}, sudah bisa kirim variable apapun, sepuasnya ke templates

  func WkTagViewHandler(w http.ResponseWriter, r *http.Request) {
          
          tagName := mux.Vars(r)["tag"]
          
          funcMap := template.FuncMap{
              "safehtml": func(text string) template.HTML { 

                  text = text + " "
                  text = strings.Replace(text, "<", "<", -1)   
                  text = strings.Replace(text, ">", ">", -1) 
                    
                  text = strings.Replace(text, "
", "
", -1) 
                  text = strings.Replace(text, "
", "
", -1) 

                  regexPagar, _ := regexp.Compile(tagPattern)
                  tags          := regexPagar.FindAllString(text, -1)

                  for _ , value  := range tags {
                    
                    tagAscii  := strings.Replace(value, "#", "#", 1)
                    tagOnly   := strings.Replace(value, "#", "", 1)
                    text = strings.Replace(text, value, "" + tagAscii + "", 1)
                  }

                  return template.HTML(text) 
            },
          }
          templates := template.Must(template.New("").Funcs(funcMap).ParseFiles(templatePath + "webkoe-base.html", templatePath + "webkoe-tagview.html"))
          
          var results []Blog
          err = MCol.Find(bson.M{"tag": tagName}).Sort("-date").Limit(1000000000000).All(&results)
          if err != nil {
              panic(err)
          }

          finalResult := map[string]interface{}{
            "tagName" : tagName,
            "tagList" : results,
          }
          err := templates.ExecuteTemplate(w, "base", finalResult)
          if err != nil {
              http.Error(w, err.Error(), http.StatusInternalServerError)
          }
      }

Tinggal satu masalah lagi, variable #go yang masih belum clear. Passing tagName dan result dalam satu var, yang satunya "string", dan satunya lagi "[]Blog"

package main

    import (
        "fmt"
        "github.com/gorilla/mux"
        "github.com/gorilla/sessions"
        "github.com/fzzy/radix/redis"
        "net"
        "net/http"
        "html/template"
        "gopkg.in/mgo.v2"         
        "gopkg.in/mgo.v2/bson"
        "regexp"
        "strings"
        "crypto/rand"
        "time"
        // "reflect"
    )
    
    var (
        // MongoDB
        mongoConfig       = "mongodb://***usermongo***:***passmongo***@localhost:***portmongo***/***dbmongo***"
        MongoSession, err = mgo.Dial(mongoConfig)
        MDB               = MongoSession.DB("admin")
        MCol              = MDB.C("blog")

        // Session
        store             = sessions.NewCookieStore([]byte("something-very-secret"))

        // Tag Factory
        tagPattern        = "#([a-z]|[A-Z])+"
    )

    type Blog struct {
      Id string
      Things string
      Date string
      Ip string
      Agent string
      Tag []string
    }

    // type tagView struct {
    //   tagName string
    //   tagList []main.Blog
    // }

    func WkHomeHandler(w http.ResponseWriter, r *http.Request) {
        err := template.Must(template.ParseFiles("templates/webkoe-home.html")).Execute(w, nil) 
        if err != nil { 
           http.Error(w, err.Error(), http.StatusInternalServerError) 
        } 
    }

    func WkTagViewHandler(w http.ResponseWriter, r *http.Request) {
        
        tagName := mux.Vars(r)["tag"]
        
        funcMap := template.FuncMap{
            "safehtml": func(text string) template.HTML { 

                text = text + " "
                text = strings.Replace(text, "<", "<", -1)   
                text = strings.Replace(text, ">", ">", -1) 
                  
                text = strings.Replace(text, "
", "
", -1) 
                text = strings.Replace(text, "
", "
", -1) 

                regexPagar, _ := regexp.Compile(tagPattern)
                tags          := regexPagar.FindAllString(text, -1)

                for _ , value  := range tags {
                  
                  tagAscii  := strings.Replace(value, "#", "#", 1)
                  tagOnly   := strings.Replace(value, "#", "", 1)
                  text = strings.Replace(text, value, "" + tagAscii + "", 1)
                }

                return template.HTML(text) 
          },
        }
        templates := template.Must(template.New("").Funcs(funcMap).ParseFiles("templates/webkoe-base.html", "templates/webkoe-tagview.html"))
        
        var results []Blog
        err = MCol.Find(bson.M{"tag": tagName}).Sort("-date").Limit(1000000000000).All(&results)
        if err != nil {
            panic(err)
        }
        err := templates.ExecuteTemplate(w, "base", results)
        if err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
        }
    }

    func WkCreateHandler(w http.ResponseWriter, r *http.Request) {

        blog_id := randStr(7, "alphanum")

        session, _ := store.Get(r, "session-name")
        session.Values["blog_id"] = blog_id
        session.Save(r, w)

        templates := template.Must(template.New("").ParseFiles("templates/webkoe-base.html", "templates/webkoe-create.html"))
        err := templates.ExecuteTemplate(w, "base", blog_id)
        if err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
        }
    }

    func WkPostCreateHandler(w http.ResponseWriter, r *http.Request) {

        things          := r.FormValue("things")
        thingsWithSpace := things + " "
        captcha         := r.FormValue("captcha")
        session,_       := store.Get(r, "session-name")
        blog_id         := fmt.Sprintf("%s", session.Values["blog_id"])

        if things != "" {
          if captcha == blog_id {
        
              // Factory
              cariTag,_  := regexp.Compile(tagPattern)
              tagFound   := cariTag.FindAllString(thingsWithSpace, -1)

              var tempTags []string
              for _, value := range tagFound {
                  cleanRegex,_  := regexp.Compile("(#| )")
                  cleanTag      := cleanRegex.ReplaceAllString(value, "")
                  tempTags       = append(tempTags, cleanTag)
              }

              waktu     := strings.Split(fmt.Sprint(time.Now()), ".")[0]
              ip        := GetIP(r)
              agent     := fmt.Sprint(r.Header["User-Agent"])

              jsonBlog  := &Blog{Id: blog_id, Things: things, Date: waktu, Ip: ip, Agent: agent, Tag: tempTags}
              err        = MCol.Insert(jsonBlog)

              fmt.Println("Welcome, " + things + " " + thingsWithSpace)
              http.Redirect(w, r, "/#thanks", 301)

          }else{
              
              fmt.Println("Robot ?")
              http.Redirect(w, r, "/#you_r_a_bots", 301)

          }
        }else{
              
              http.Redirect(w, r, "/#empty", 301)

        }

        
        // fmt.Println("Someone POST " + things + " blog_id " + blog_id)
        // fmt.Println(blog_id)
        /*
        templates := template.Must(template.New("").ParseFiles("templates/webkoe-base.html", "templates/webkoe-create.html"))
        err := templates.ExecuteTemplate(w, "base", nil)
        if err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
        }
        */
    }

    func WkListHandler(w http.ResponseWriter, r *http.Request) {
        funcMap := template.FuncMap{
            "safehtml": func(text string) template.HTML { 

                text = text + " "
                text = strings.Replace(text, "<", "<", -1)   
                text = strings.Replace(text, ">", ">", -1) 
                  
                text = strings.Replace(text, "
", "
", -1) 
                text = strings.Replace(text, "
", "
", -1) 

                regexPagar, _ := regexp.Compile(tagPattern)
                tags          := regexPagar.FindAllString(text, -1)

                for _ , value  := range tags {
                  
                  tagAscii  := strings.Replace(value, "#", "#", 1)
                  tagOnly   := strings.Replace(value, "#", "", 1)
                  text = strings.Replace(text, value, "" + tagAscii + "", 1)
                }

                return template.HTML(text) 
          },
        }
        templates := template.Must(template.New("").Funcs(funcMap).ParseFiles("templates/webkoe-base.html", "templates/webkoe-list.html"))
        
        var results []Blog
        err = MCol.Find(bson.M{}).Sort("-date").Limit(1000000000000).All(&results)
        if err != nil {
            panic(err)
        }

        // var finalResult []tagView
        // fmt.Println(reflect.TypeOf(results))
        err := templates.ExecuteTemplate(w, "base", results)
        if err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
        }
    }

    func CatatanHomeHandler(w http.ResponseWriter, r *http.Request) {
        var results []Blog
        err = MCol.Find(bson.M{}).Sort("-date").Limit(100).All(&results)
        if err != nil {
          panic(err)
        }
        err := template.Must(template.ParseFiles("templates/gorilla-catatanhome.html")).Execute(w, results) 
        if err != nil { 
           http.Error(w, err.Error(), http.StatusInternalServerError) 
        } 
    }

    func HomeWKSHandler(w http.ResponseWriter, r *http.Request) {
        err := template.Must(template.ParseFiles("templates/gorilla-home_wks.html")).Execute(w, nil) 
        if err != nil { 
           http.Error(w, err.Error(), http.StatusInternalServerError) 
        } 
    }

    func WkBlogHandler(w http.ResponseWriter, r *http.Request) {
        page := mux.Vars(r)["page"]
        err := template.Must(template.ParseFiles("templates/gorilla-blog.html")).Execute(w, map[string]string{"halaman": page}) 
        if err != nil { 
           http.Error(w, err.Error(), http.StatusInternalServerError) 
        }
    }

    func WkRedisHandler(w http.ResponseWriter, r *http.Request) {

        // redis
        redisClient, _ := redis.Dial("tcp", "localhost:6379")
        news, _ := redisClient.Cmd("zrevrangebyscore", "news:republika:posttime", "+inf", "-inf", "limit", "0", "3").List()
        
        var bundleNews []string
        for _, elemStr := range news {
          bundleNews = append(bundleNews, elemStr)
          fmt.Println(bundleNews)
        }

        // render
        err := template.Must(template.ParseFiles("templates/gorilla-redis.html")).Execute(w, bundleNews) 
        if err != nil { 
           http.Error(w, err.Error(), http.StatusInternalServerError) 
        }
    }  

    func WkTestPassVarHandler(w http.ResponseWriter, r *http.Request) {
        err := template.Must(template.ParseFiles("templates/gorilla-blog.html")).Execute(w, map[string]string{"halaman": "2"}) 
        if err != nil { 
           http.Error(w, err.Error(), http.StatusInternalServerError) 
        }
    }

    func randStr(strSize int, randType string) string {
       var dictionary string
       if randType == "alphanum" {
          dictionary = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
       }
       if randType == "alpha" {
          dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
       }
       if randType == "number" {
          dictionary = "0123456789"
       }
       var bytes = make([]byte, strSize)
       rand.Read(bytes)
       for k, v := range bytes {
          bytes[k] = dictionary[v%byte(len(dictionary))]
       }
       return string(bytes)
    }

    func GetIP(r *http.Request) string {
        if ipProxy := r.Header.Get("X-FORWARDED-FOR"); len(ipProxy) > 0 {
            return ipProxy
        }
        ip, _, _ := net.SplitHostPort(r.RemoteAddr)
        return ip
    }

    func main() {

        // MUX ROUTER
        mx := mux.NewRouter()

        // WEBKOE.NET
        
        // *** home ***
        mx.HandleFunc("/", WkListHandler).Host("webkoe.net")
        
        // *** tag  ***
        mx.HandleFunc("/tag/{tag}", WkTagViewHandler).Host("webkoe.net").Methods("GET")
        
        // *** create ***
        mx.HandleFunc("/create", WkCreateHandler).Host("webkoe.net").Methods("GET")
        mx.HandleFunc("/create", WkPostCreateHandler).Host("webkoe.net").Methods("POST")
        
        // *** misc ***
        mx.HandleFunc("/test/pass_var", WkTestPassVarHandler).Host("webkoe.net")
        mx.HandleFunc("/redis", WkRedisHandler).Host("webkoe.net")
        mx.HandleFunc("/page/{page}", WkBlogHandler).Host("webkoe.net")
        mx.PathPrefix("/").Handler(http.FileServer(http.Dir("./public/"))).Host("webkoe.net")

        // CATATAN.WEBKOE.NET
        mx.HandleFunc("/", CatatanHomeHandler).Host("catatan.webkoe.net")

        // WEBKANSAJA.COM
        mx.HandleFunc("/", HomeWKSHandler).Host("webkansaja.com")

        http.ListenAndServe(":80", mx)
    }

Semua pattern tagsearch di List, tagView, dan POSTcreate juga dimasukkan ke var() #go #webkoe

Semua var #go masuk ke var() #webkoe

- How to start executable file with forever
- How to Pass result and tagName to template

1. Disisi server
   ** bisa dilakukan, tapi belum tau caranya mempassing HTML Tag ke template martini
2. Sisi Client
   ** tinggal copas script di express ke client

package main

  import (
    "github.com/go-martini/martini"
    "github.com/martini-contrib/render"
    "gopkg.in/mgo.v2"
    "gopkg.in/mgo.v2/bson"
    "net"
    "net/http"
    "fmt"
    "time"
    "crypto/rand"
    "strings"
    "regexp"
  )

  // local 
  var mongoConfig = "127.0.0.1:27017"
  var blogCollection = "webkoe_blog"
  var hostHome = "localhost:8080"
  var hostCatatan = "catatan"


  // webkoe
  // var mongoConfig = "mongodb://usermongo:passmongo@localhost:portmongo/dbmongo"
  // var blogCollection = "blog"
  // var hostHome = "webkoe.net:8080"
  // var hostCatatan = "catatan.webkoe.net"


  type Blog struct {
    Id string
    Things string
    Date string
    Ip string
    Agent string
    Tag []string
  }

  func GetIP(r *http.Request) string {
      if ipProxy := r.Header.Get("X-FORWARDED-FOR"); len(ipProxy) > 0 {
          return ipProxy
      }
      ip, _, _ := net.SplitHostPort(r.RemoteAddr)
      return ip
  }

  func randStr(strSize int, randType string) string {
     var dictionary string
     if randType == "alphanum" {
        dictionary = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
     }
     if randType == "alpha" {
        dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
     }
     if randType == "number" {
        dictionary = "0123456789"
     }
     var bytes = make([]byte, strSize)
     rand.Read(bytes)
     for k, v := range bytes {
        bytes[k] = dictionary[v%byte(len(dictionary))]
     }
     return string(bytes)
   }

  func main() {

      // MARTINI
      m := martini.Classic()
      m.Use(render.Renderer(render.Options{
            Layout: "layout",
      }))

      // MONGODB
      session, err := mgo.Dial(mongoConfig)
      if err != nil {
        panic(err)
      }
      defer session.Close()
      session.SetMode(mgo.Monotonic, true)
      webkoe_blog := session.DB("admin").C(blogCollection)

      // ROUTER
      m.Get("/", func(r render.Render, req *http.Request) {
        if req.Host == hostHome {
          r.HTML(200, "home", req.Host)
        }else if req.Host == hostCatatan {
          r.HTML(200, "home-catatan", req.Host)
        }
      })

      m.Get("/blog", func(r render.Render) {
        var results []Blog
        err = webkoe_blog.Find(bson.M{}).Sort("-date").Limit(100).All(&results)
        if err != nil {
          panic(err)
        }
        // fmt.Println(results)
        r.HTML(200, "blog", results)
      })
      m.Post("/blog", func(req *http.Request, r render.Render){
        
        things := req.FormValue("things") + " "
        
        // tag
        regex, err := regexp.Compile("#([a-z])+ ")
        remove, err := regexp.Compile("(#| )")
        tags := regex.FindAllString(things, -1)
        // fmt.Println(tags)

        // modify semua listA
        var modTags []string
        for _, value := range tags {
            final := remove.ReplaceAllString(value, "")
            modTags = append(modTags, final)
        }
        // fmt.Println(modTags)


        waktu := strings.Split(fmt.Sprint(time.Now()), ".")[0]
        blog_id := randStr(7, "alphanum")
        ip := GetIP(req)
        agent := fmt.Sprint(req.Header["User-Agent"])

        jsonBlog := &Blog{Id: blog_id, Things: things, Date: waktu, Ip: ip, Agent: agent, Tag: modTags}
        err = webkoe_blog.Insert(jsonBlog)
        if err != nil {
          panic(err)
        }
        // fmt.Println(agent)
        r.Redirect("/blog")
      })
      m.Get("/blog/write", func(r render.Render) {
        r.HTML(200, "blog-form", nil)
      })

      m.RunOnAddr(":8080")
  }

package main

    import "fmt"
    import "encoding/json"

    type Blog struct {
        id string
        things string
        tag []string
    }

    func main() {
        
        fmt.Println("\nMari mulai belajar list dan map Golang ...")

        // list
        listA   := []string{"ikan","sayur","buah", "1", "2", "3"}
        listB, _ := json.Marshal(listA)
        fmt.Println("\nlistA adalah " + string(listB))

        listA2   := []int{1,2,3}
        listB2, _ := json.Marshal(listA2)
        fmt.Println("\nlistA2 adalah " + string(listB2))   

        // dict
        mapA    := map[string]int {"apple": 5, "lettuce": 7}
        mapB, _ := json.Marshal(mapA)
        fmt.Println("\nmapA adalah " + string(mapB))

        fmt.Println("\nlist A")
        for _, value := range listA {
            fmt.Println(value)
        }

        fmt.Println("\nlist A2")
        for _, value := range listA2 {
            fmt.Println(value)
        }      

        fmt.Println("\nmapA")
        for key , value := range mapA {
            fmt.Println(key + " " + fmt.Sprint(value))
        }

        // manipulate list
        fmt.Println("\nAppend listA")
        x := append(listA, "77")
        fmt.Println(x)

        // modify semua listA
        fmt.Println("\nModify listA")
        var modListA []string
        for _, value := range listA {
            modListA = append(modListA, "mod:" + value)
        }
        fmt.Println(modListA)
    }

D:\PROJECTS\GO-APP>go run coba_json_sendiri.go

Mari mulai belajar list dan map Golang ...

listA adalah ["ikan","sayur","buah","1","2","3"]

listA2 adalah [1,2,3]

mapA adalah {"apple":5,"lettuce":7}

list A
ikan
sayur
buah
1
2
3

list A2
1
2
3

mapA
lettuce 7
apple 5

Append listA
[ikan sayur buah 1 2 3 77]

Modify listA
[mod:ikan mod:sayur mod:buah mod:1 mod:2 mod:3]

Yang saya tahu pada awalnya, pada #javascript dan #python
    
    a = ['ikan', 'sayur', 'buah', 1, 2, 3]

selesai, list sudah langsung terbentuk
bahkan dengan #php pun mudah

    a = array('ikan', 'sayur', 'buah', 1, 2, 3)

Buum, jadi ....

di GO lumayan runyam, namun JELAS dan RAPI

    listA   := []string{"ikan","sayur","buah", "1", "2", "3"}
    listB, _ := json.Marshal(listA)
    fmt.Println(string(listB)) // output ["ikan","sayur","buah","1","2","3"]

    listA2   := []int{1,2,3}
    listB2, _ := json.Marshal(listA2)
    fmt.Println(string(listB2)) // output [1,2,3]

listA adalah list dengan type data STRING, angka bisa masuk, tapi dia tidak diperlakukan sebagai INT (dengan petik dua "")
sedangankan listA2 adalah list dengan type data INT, anggotanya benar-benar angka (tanpa petik dua ""),
ikan sayur buah ERROR pada saat di-compile jika dipaksakan masuk

kode lengkapnya #go-nya :

    package main

    import "fmt"
    import "encoding/json"

    type Blog struct {
        id string
        things string
        tag []string
    }

    func main() {
        
        fmt.Println("Mari mulai ...")

        // list
        listA   := []string{"ikan","sayur","buah", "1", "2", "3"}
        listB, _ := json.Marshal(listA)
        fmt.Println(string(listB))

        listA2   := []int{1,2,3}
        listB2, _ := json.Marshal(listA2)
        fmt.Println(string(listB2))   

        // dict
        mapA    := map[string]int {"apple": 5, "lettuce": 7}
        mapB, _ := json.Marshal(mapA)
        fmt.Println(string(mapB))    
    }

package main 

import (
    "fmt"
    "net/http" ) 

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hi :) ... I love %s!", r.URL.Path[1:])
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}