Meetup GolangBR - Dicas Mgo Driver MongoDB

Meetup GolangBR - Dicas do Mgo Driver

Descomplicando sua vida no MongoDB

Meetup GolangBR - Dicas do Mgo Driver

Considerações

1) MySQL != NoSQL

2) NoSQL temos "Schema Free"

3) NoSQL, Não é a bala de prata

4) Documentação

Meetup GolangBR - Dicas do Mgo Driver

Instalação e ambiente

$ gvm use go1.9 --default

$ go get -v -u gopkg.in/mgo.v2

Go version manager - https://github.com/moovweb/gvm

Mgo Driver - https://github.com/go-mgo/mgo

Meetup GolangBR - Dicas do Mgo Driver

package dbs

import (
	"log"
	"time"
	"os"
	mgo "gopkg.in/mgo.v2"
)

//MgoSession and session
type MgoSession struct {
	Session *mgo.Session
}

func newMgoSession(s *mgo.Session) *MgoSession {
	return &MgoSession{s}
}

Importação dos pacotes, struct e New Session

Meetup GolangBR - Dicas do Mgo Driver

package dbs

import (
	mgo "gopkg.in/mgo.v2"
)

//StartMongoDB initialize session on mongodb
func StartMongoDB(msg string) *MgoSession {

	mongoDBDialInfo := &mgo.DialInfo{
		Addrs:    []string{os.Getenv("MONGODB_URL")},
		Timeout:  60 * time.Second,
		Database: os.Getenv("MONGODB_DB"),
		Username: os.Getenv("MONGODB_USER"),
		Password: os.Getenv("MONGODB_PASS"),
	}

	mongoSession, err := mgo.DialWithInfo(mongoDBDialInfo)
	if err != nil {
		log.Fatalf("[MongoDB] CreateSession: %s\n", err)
	}

	mongoSession.SetMode(mgo.Monotonic, true)
        mongoSession.SetSocketTimeout(1 * time.Hour) 

	ensureIndexMetupGolangBR(mongoSession)

	log.Printf("[MongoDB] connected! %s", msg)
	return newMgoSession(mongoSession)
}

Start e configuração de conecção

Meetup GolangBR - Dicas do Mgo Driver


func ensureIndexMetupGolangBR(s *mgo.Session) {
	session := s.Copy()
	defer session.Close()

	c := session.DB("meetup").C("golangbr")
	index := mgo.Index{
		Key:        []string{"field1", 
                                     "field2", 
                                     "field3", 
                                     "field4", 
                                     "field5"},
		Unique:     false,
		DropDups:   false,
		Background: true,
		Sparse:     true,
	}
	if err := c.EnsureIndex(index); err != nil {
		log.Printf("Error on create index: %s", err)
	}
}

Índices e configuração

Meetup GolangBR - Dicas do Mgo Driver


package dbs

import (
	"gopkg.in/mgo.v2"
)

//Dispatch dbs session
type Dispatch struct {
	MongoDB *mgo.Session
	RedisCache *RedisSession
}

//StartDispatch load up connections
func StartDispatch() *Dispatch {
	//add session of mongodb
	mongosession := StartMongoDB("Dispatch Service").Session
	//add session of redis
	redisCache := StartRedis("Dispatch Service")

	return &Dispatch{MongoDB: mongosession, RedisCache: redisCache}
}

Sessões (dispatch)

Meetup GolangBR - Dicas do Mgo Driver


//GetAllProjectsByUser list all projects by user id
func GetAllProjectsByUser(s *db.Dispatch) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		session := s.MongoDB.Copy()
		defer session.Close()

		//get user id from context
		claims, ok := r.Context().Value(models.JwtKey).(models.Claims)
		if !ok {
			w.Header().Set("Content-Type", "application/json; charset=utf-8")
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, `{"message":"Missing token or token invalid"}`)
			return
		}

		projects := []models.Project{}

		oid := bson.ObjectIdHex(claims.UserID)
		if err := session.DB("meetup").C("golangbr").
			Find(bson.M{"users": oid}).
			All(&projects); err != nil {
			w.Header().Set("Content-Type", "application/json; charset=utf-8")
			w.WriteHeader(http.StatusNotFound)
			fmt.Fprintf(w, `{"message":"Registry Not Found"}`)
			return
		}

		uj, _ := json.Marshal(projects)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		fmt.Fprintf(w, "%s", uj)
	}

}

Controllers

Meetup GolangBR - Dicas do Mgo Driver

Highlights

Cluster discovery and communication

Failover management

Synchronous and concurrent

Result pre-fetching

Flexible serialization

Trivial consistency-level management

Authentication support with pooling integration

GridFS support

Meetup GolangBR - Dicas do Mgo Driver

Obrigado!

e-mail: thiago.zilli@gmail.com

twitter: @thiagozs

linkedin: https://www.linkedin.com/in/thiagozs/