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db.go
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db.go
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package db
import (
"database/sql"
"flag"
"fmt"
_ "github.com/lib/pq"
"github.com/peter-mount/go-kernel/v2"
"os"
"time"
)
// DBService database/sql bound with github.com/lib/pq as a Kernel Service
type DBService struct {
postgresURI *string
db *sql.DB
maxOpen int
maxIdle int
maxLifetime time.Duration
// Set to true to enable additional debugging
Debug bool
}
func (s *DBService) Init(_ *kernel.Kernel) error {
s.postgresURI = flag.String("db", "", "The database to connect to")
return nil
}
func (s *DBService) Start() error {
if *s.postgresURI == "" {
*s.postgresURI = os.Getenv("POSTGRESDB")
}
if *s.postgresURI == "" {
return fmt.Errorf("No database uri provided")
}
if s.maxOpen < 0 {
s.maxOpen = 1
}
if s.maxIdle < 0 {
s.maxIdle = 1
} else if s.maxIdle > s.maxOpen {
s.maxIdle = s.maxOpen
}
db, err := sql.Open("postgres", *s.postgresURI)
if err != nil {
return err
}
s.db = db
db.SetMaxOpenConns(s.maxOpen)
db.SetMaxIdleConns(s.maxIdle)
if s.maxLifetime > 0 {
db.SetConnMaxLifetime(s.maxLifetime)
}
return nil
}
func (s *DBService) Stop() {
if s.db != nil {
_ = s.db.Close()
s.db = nil
}
}
// GetDB returns the underlying sql.DB
func (s *DBService) GetDB() *sql.DB {
return s.db
}
func (s *DBService) SetDB(postgresURI string) *DBService {
s.postgresURI = &postgresURI
return s
}
func (s *DBService) MaxOpen(maxOpen int) *DBService {
s.maxOpen = maxOpen
return s
}
func (s *DBService) MaxIdle(maxIdle int) *DBService {
s.maxIdle = maxIdle
return s
}
func (s *DBService) MaxLifetime(maxLifetime time.Duration) *DBService {
s.maxLifetime = maxLifetime
return s
}
func (s *DBService) Exec(query string, args ...interface{}) (sql.Result, error) {
r, e := s.db.Exec(query, args...)
return r, e
}
func (s *DBService) Query(query string, args ...interface{}) (*sql.Rows, error) {
r, e := s.db.Query(query, args...)
return r, e
}
func (s *DBService) QueryRow(query string, args ...interface{}) *sql.Row {
return s.db.QueryRow(query, args...)
}
func (s *DBService) Prepare(sql string) (*sql.Stmt, error) {
return s.db.Prepare(sql)
}
func (s *DBService) Begin() (*sql.Tx, error) {
return s.db.Begin()
}