Go-Echo-Kit

Overview

Go Echo Kit provides useful tools for go-echo development.

1. Configuration with Viper
2. DB connector with Gorm
3. Logger
4. Messages with i18n

Installation

go get

go get -u github.com/rakutentech/go-echo-kit

Database

How to use it

DB manager

DB can be started like below

import "github.com/rakutentech/go-echo-kit/db"

m := db.New()
m.AddConnString(connectStringMaster) // Add single connect string
m.AddConnStrings(connectStringSlaves) // Add mutliple connect string
m.Open()
defer m.Close()

m.MasterConn().Create(&user) // Connect to master
m.SlaveConn().Find(&user) // Connect to slave

You can add mulitple connect strings, and the first one will be the master. SlaveConn will return one of slave randomly, and it can fail over to other slaves and master.

Regarding DB queries and how to generate connect string, please refer to GORM guide

ConnectStringBuilder

This package also provides useful tool to build connection strings

import "github.com/rakutentech/go-echo-kit/db"

builder := db.ConnStringBuilder{}
connStr := builder.
  SetFormat()
  SetHost("YourHost").
  SetUsername("YourUsername").
  SetPort("YourPort").
  SetPassword("YourPwd").
  SetOptions(optionMap)
  Build()

There is one more option to build string from config

import "github.com/rakutentech/go-echo-kit/config"

cfg := config.New()
connStr := builder.SetWithConfig(cfg.Sub("databases.master")).Build())

Check testdata/config.yaml to get more details

Enviroment variables

Variable name	Description	Default
DB_DRIVER	Db drivers which Gorm supports	mysql
DB_CONN_MAX_LIFETIME	Maximum connection life time(seconds)	unlimited
DB_MAX_IDLE_CONNS	Maximum number of idle connection	2
DB_MAX_OPEN_CONNS	Maximum number of open connection	unlimited

Multiple DB connections (mysql only)

How to use it

import "github.com/rakutentech/go-echo-kit/db"
var dbConfig[] db.MultiDbConf

db1Config := db.MultiDbConf {
    Master: db1MasterDsn, // master db1 connection string
    Slaves: db1SlaveDsns, // salve db1 connection strings
    DbName: "db1",
}
db2Config := db.MultiDbConf {
    Master: db2MasterDsn, // master db2 connection string
    Slaves: db2SlaveDsns, // slave db2 connection strings
    DbName: "db2",
}

dbConfig = append(dbConfig, db1Config, db2Config)
dbConn = db.OpenDBConn(dbConfig)

defer db.CloseDBConn(dbConn)

import "github.com/rakutentech/go-echo-kit/db"

query := db.GetInstance("db1", db.ConnTypeSlave).
		Select("user_id, name, email, created_at").
		Table("user").
		Limit(2)

Configuration

How to use it

Configuration can be started like below

import "github.com/rakutentech/go-echo-kit/config"

cfg := config.New()
secret := cfg.GetString("app.secret")

Default config file type is yaml, but can be changed whatever viper supports.

Sample config file

app:
  env: stg
  secret: ${APP_SECRET}

For ${APP_SECRET}, go-echo-kit will automatically find .env(dotenv) file from CONFIG_PATH or find it from environment variable.

Sample .env file

APP_SECRET=secret
DB_DRIVER=sqlite3
DB_PORT=4306

Logger

How to use it

Logger can be started like below

import "github.com/rakutentech/go-echo-kit/logger"

logger.SetLogFile(filepath) // for simple use
logger.Notice("Your notice")
logger.Error("Your error")
logger.Crit("Your critical error that app should stop")

logger.SetRotatingLogFile(filepathPattern, options...) // For log rotation

Check file-rotatelogs to get information about log rotation

Sample commands

# For test
cp config/.env.testing config/.env
go test ./...

# For build/run
cp config/.env.stg config/.env
go run main.go

You can create seprate dotenv files and replace them when you want.

Enviroment variables

Variable name	Description	Default
CONFIG_TYPE	Config file type viper supports	Yaml
CONFIG_PATH	Where config file exists	./config(for local)

For more information about configuration, please refer to Viper