/
driver.go
119 lines (99 loc) · 2.6 KB
/
driver.go
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package driver
import (
"context"
"database/sql"
"errors"
"log"
"strconv"
"strings"
"time"
"github.com/agschrei/go-crud-k8s-demo/internal/config"
_ "github.com/jackc/pgconn"
_ "github.com/jackc/pgx/v4"
_ "github.com/jackc/pgx/v4/stdlib"
)
const maxOpenDbCon = 5
const maxIdleDbCon = 3
const maxDbConKeepAlive = 5 * time.Minute
type PsqlDriverManager struct {
dbConfig *config.DbConfig
logger *log.Logger
}
func NewPsqlDriverManager(dbConfig *config.DbConfig, logger *log.Logger) *PsqlDriverManager {
return &PsqlDriverManager{
dbConfig: dbConfig,
logger: logger,
}
}
// NewDatabase creates a database using the configuration associated with the PsqlDriverManager
func (manager *PsqlDriverManager) NewDatabase() (*sql.DB, error) {
manager.logger.Print("Creating database connection...")
dsn, err := DsnFromDbConfig(manager.dbConfig)
if err != nil {
return nil, err
}
db, err := sql.Open("pgx", dsn)
if err != nil {
return nil, err
}
db.SetMaxOpenConns(maxOpenDbCon)
db.SetMaxIdleConns(maxIdleDbCon)
db.SetConnMaxLifetime(maxDbConKeepAlive)
ctx, cancel := context.WithTimeout(context.Background(), manager.dbConfig.ConnectionTimeout)
defer cancel()
if err = db.PingContext(ctx); err != nil {
return nil, err
}
manager.logger.Print("Successfully created database connection.")
return db, nil
}
func DsnFromDbConfig(dbConf *config.DbConfig) (string, error) {
//TODO: consider using text/template to make this code a bit cleaner
var sb strings.Builder
prefix := "postgresql://"
host := dbConf.Hostname
port := dbConf.Port
dbName := dbConf.DbName
user := dbConf.User
pass := dbConf.Pass
conTimeout := int(dbConf.ConnectionTimeout.Seconds())
sslDisabled := dbConf.SslDisabled
hasParams := conTimeout != 0 || sslDisabled
if host == "" {
return "", errors.New("cannot construct DSN because no host is set in DbConfig")
}
sb.WriteString(prefix)
if user != "" {
sb.WriteString(user)
if pass != "" {
sb.WriteString(":")
sb.WriteString(pass)
}
sb.WriteString("@")
}
sb.WriteString(host)
if port != "" {
sb.WriteString(":")
sb.WriteString(port)
}
if dbName != "" {
sb.WriteString("/")
sb.WriteString(dbName)
}
if hasParams {
sb.WriteString("?")
atLeastOne := false
if conTimeout != 0 {
sb.WriteString("connect_timeout=")
sb.WriteString(strconv.Itoa(int(conTimeout)))
atLeastOne = true
}
if sslDisabled {
if atLeastOne {
sb.WriteString("&")
}
sb.WriteString("sslmode=disable")
}
}
return sb.String(), nil
}