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module.go
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module.go
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package database
import (
"context"
"fmt"
"github.com/spf13/viper"
"go.uber.org/fx"
"go.uber.org/zap"
"gorm.io/driver/postgres"
"gorm.io/gorm"
gorm_logger "gorm.io/gorm/logger"
"github.com/alsey89/gogetter/common"
)
const (
DefaultHost = "0.0.0.0"
DefaultPort = 5432
DefaultDbName = "postgres"
DefaultUser = "postgres"
DefaultPassword = "password"
DefaultSSLMode = "allow"
DefaultLogLevel = "info"
DefaultAutoMigrate = false
)
type Config struct {
Host string
Port int
DBName string
User string
Password string
SSLMode string
LogLevel string
AutoMigrate bool
}
type Module struct {
logger *zap.Logger
config *Config
schema []interface{}
scope string
db *gorm.DB
}
type Params struct {
fx.In
Lifecycle fx.Lifecycle
Logger *zap.Logger
}
func InitiateModuleAndSchema(scope string, schema ...interface{}) fx.Option {
return fx.Module(
scope,
fx.Provide(func(p Params) (*Module, error) {
logger := p.Logger.Named("[" + scope + "]")
config := loadConfig(scope)
database := &Module{
logger: logger,
config: config,
scope: scope,
schema: schema,
}
db := database.setUpDBConnectionOrFatal()
database.db = db
return database, nil
}),
fx.Invoke(func(m *Module, p Params) {
p.Lifecycle.Append(
fx.Hook{
OnStart: m.onStart,
OnStop: m.onStop,
},
)
}),
)
}
func (m *Module) onStart(context.Context) error {
m.logger.Info("Database initiated")
if m.config.AutoMigrate {
m.Migrate(m.schema...)
}
m.printDebugLogs()
return nil
}
func (m *Module) onStop(context.Context) error {
dbSql, err := m.db.DB()
if err != nil {
m.logger.Error("Error getting DB from GORM", zap.Error(err))
return err
}
err = dbSql.Close()
if err != nil {
m.logger.Error("Error closing DB", zap.Error(err))
}
m.logger.Info("Database module stopped")
return nil
}
// ---------------------------------------------------------
func loadConfig(scope string) *Config {
//set default values
viper.SetDefault(common.GetConfigPath(scope, "host"), DefaultHost)
viper.SetDefault(common.GetConfigPath(scope, "port"), DefaultPort)
viper.SetDefault(common.GetConfigPath(scope, "dbname"), DefaultDbName)
viper.SetDefault(common.GetConfigPath(scope, "user"), DefaultUser)
viper.SetDefault(common.GetConfigPath(scope, "password"), DefaultPassword)
viper.SetDefault(common.GetConfigPath(scope, "sslmode"), DefaultSSLMode)
viper.SetDefault(common.GetConfigPath(scope, "log_level"), DefaultLogLevel)
viper.SetDefault(common.GetConfigPath(scope, "auto_migrate"), DefaultAutoMigrate)
return &Config{
Host: viper.GetString(common.GetConfigPath(scope, "host")),
Port: viper.GetInt(common.GetConfigPath(scope, "port")),
DBName: viper.GetString(common.GetConfigPath(scope, "dbname")),
User: viper.GetString(common.GetConfigPath(scope, "user")),
Password: viper.GetString(common.GetConfigPath(scope, "password")),
SSLMode: viper.GetString(common.GetConfigPath(scope, "sslmode")),
LogLevel: viper.GetString(common.GetConfigPath(scope, "log_level")),
AutoMigrate: viper.GetBool(common.GetConfigPath(scope, "auto_migrate")),
}
}
func (m *Module) setUpDBConnectionOrFatal() *gorm.DB {
dsn := m.getConnectionStringFromConfig()
loglevel := m.getLogLevelFromConfig()
db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{
Logger: gorm_logger.Default.LogMode(loglevel),
})
if err != nil {
m.logger.Fatal("Error connecting to database", zap.Error(err))
}
return db
}
func (m *Module) getConnectionStringFromConfig() string {
return fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=%s",
m.config.Host, m.config.Port, m.config.User, m.config.Password, m.config.DBName, m.config.SSLMode)
}
func (m *Module) getLogLevelFromConfig() gorm_logger.LogLevel {
switch m.config.LogLevel {
case "silent":
return gorm_logger.Silent
case "error":
return gorm_logger.Error
case "warn":
return gorm_logger.Warn
case "info":
return gorm_logger.Info
default:
return gorm_logger.Info
}
}
func (m *Module) printDebugLogs() {
//* Debug Logs
m.logger.Debug("----- Database Configuration -----")
m.logger.Debug("Host", zap.String("host", m.config.Host))
m.logger.Debug("Port", zap.Int("port", m.config.Port))
m.logger.Debug("DBName", zap.String("dbname", m.config.DBName))
m.logger.Debug("User", zap.String("user", m.config.User))
m.logger.Debug("SSLMode", zap.String("sslmode", m.config.SSLMode))
}
func (m *Module) Migrate(schema ...interface{}) {
m.logger.Info("Auto migrating database")
err := m.db.AutoMigrate(schema...)
if err != nil {
m.logger.Error("Error auto migrating database", zap.Error(err))
}
}
// GETTERS ---------------------------------------------------------
func (m *Module) GetDB() *gorm.DB {
return m.db
}