/
sql.go
181 lines (159 loc) · 3.76 KB
/
sql.go
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package sql
//go:generate mockgen -source=sql.go -destination=mocksql/mocksql.go -package=mocksql
import (
"encoding/json"
"errors"
"fmt"
"strings"
"time"
"github.com/jaimeteb/chatto/fsm"
"github.com/jaimeteb/chatto/internal/fsm/store/config"
log "github.com/sirupsen/logrus"
"gorm.io/driver/mysql"
"gorm.io/driver/postgres"
"gorm.io/driver/sqlite"
"gorm.io/gorm"
"gorm.io/gorm/logger"
)
var userCol = "user"
// FSMORM models a Finite State Machine with a gorm.Model
type FSMORM struct {
gorm.Model
User string
State int
Slots string
}
func (*FSMORM) TableName() string {
return "fsms"
}
func slotsToJSONString(slots map[string]string) string {
bytes, err := json.Marshal(slots)
if err != nil {
log.Error(err)
return "{}"
}
return string(bytes)
}
func jsonStringToSlots(jsonStr string) map[string]string {
var slots map[string]string
if err := json.Unmarshal([]byte(jsonStr), &slots); err != nil {
log.Error(err)
return make(map[string]string)
}
return slots
}
// Store models a SQL store for FSM
type Store struct {
DB DBClient
}
type DBClient interface {
First(interface{}, ...interface{}) *gorm.DB
Where(interface{}, ...interface{}) *gorm.DB
Save(interface{}) *gorm.DB
}
func NewStore(cfg *config.StoreConfig) (*Store, error) {
var db *gorm.DB
var err error
if cfg.Database == "" {
cfg.Database = "chatto"
}
switch strings.ToLower(cfg.RDBMS) {
case "mysql":
if cfg.Port == "" {
cfg.Port = "3306"
}
dsn := fmt.Sprintf(
"%s:%s@tcp(%s:%s)/%s?charset=utf8&parseTime=True&loc=Local",
cfg.User,
cfg.Password,
cfg.Host,
cfg.Port,
cfg.Database,
)
db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{
Logger: logger.Default.LogMode(logger.Silent),
})
if err != nil {
return nil, err
}
case "postgresql", "postgres":
if cfg.Port == "" {
cfg.Port = "5432"
}
userCol = fmt.Sprintf("%s.%s", new(FSMORM).TableName(), userCol)
dsn := fmt.Sprintf(
"host=%s user=%s password=%s dbname=%s port=%s sslmode=disable",
cfg.Host,
cfg.User,
cfg.Password,
cfg.Database,
cfg.Port,
)
db, err = gorm.Open(postgres.Open(dsn), &gorm.Config{
Logger: logger.Default.LogMode(logger.Silent),
})
if err != nil {
return nil, err
}
case "sqlite":
db, err = gorm.Open(sqlite.Open(cfg.Database), &gorm.Config{
Logger: logger.Default.LogMode(logger.Silent),
})
if err != nil {
return nil, err
}
default:
return nil, errors.New("no RDBMS specified for SQL connection")
}
if err := db.AutoMigrate(&FSMORM{}); err != nil {
log.Error(err)
}
sqlStore := &Store{db}
sqlStore.runPurge(cfg.TTL, cfg.Purge)
return sqlStore, nil
}
// Exists for Store
func (s *Store) Exists(user string) (e bool) {
machine := FSMORM{}
if res := s.DB.First(&machine, fmt.Sprintf("%s = ?", userCol), user); errors.Is(res.Error, gorm.ErrRecordNotFound) {
log.Debug(res.Error)
return false
}
return true
}
// Get method for Store
func (s *Store) Get(user string) *fsm.FSM {
machine := FSMORM{}
if res := s.DB.First(&machine, fmt.Sprintf("%s = ?", userCol), user); errors.Is(res.Error, gorm.ErrRecordNotFound) {
log.Debug(res.Error)
return nil
}
return &fsm.FSM{
State: machine.State,
Slots: jsonStringToSlots(machine.Slots),
}
}
// Set method for Store
func (s *Store) Set(user string, m *fsm.FSM) {
machine := FSMORM{}
s.DB.First(&machine, "user = ?", user)
machine.User = user
machine.State = m.State
machine.Slots = slotsToJSONString(m.Slots)
if res := s.DB.Save(&machine); res.Error != nil {
log.Error(res.Error)
}
}
func (s *Store) runPurge(ttl, purge time.Duration) {
if ttl > 0 && purge > 0 {
go func() {
ticker := time.NewTicker(purge)
for {
for range ticker.C {
expired := time.Now().Add(-ttl)
s.DB.Where("updated_at < ?", expired).Delete(&FSMORM{})
}
}
}()
}
}