/
db.go
174 lines (164 loc) · 4.35 KB
/
db.go
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package bot
import (
"context"
"database/sql"
"errors"
"fmt"
"io/fs"
"os"
"strings"
"github.com/golang-migrate/migrate/v4"
_ "github.com/golang-migrate/migrate/v4/database/postgres"
_ "github.com/golang-migrate/migrate/v4/source/file"
_ "github.com/lib/pq"
"github.com/wneessen/arrgo/config"
"github.com/wneessen/arrgo/model"
)
// MigrationsPath defines the path where to find the sql_migrations
const MigrationsPath = "file://sql_migrations"
const (
// ErrMigrateCloseSourceConnection should be used when a SQL migration was not able to close the source
ErrMigrateCloseSourceConnection = "failed to close sources connection for migrate: %s"
// ErrMigrateCloseDBConnection should be used when migrate is unable to close the DB connection
ErrMigrateCloseDBConnection = "failed to close DB connection for migrate: %s"
)
// OpenDB tries to connect to the SQLite file and returns the sql.DB pointer
func (b *Bot) OpenDB(c *config.Config) (*sql.DB, error) {
dsn := getDBDSN(c)
db, err := sql.Open("postgres", dsn)
if err != nil {
return nil, err
}
ctx, cf := context.WithTimeout(context.Background(), model.SQLTimeout)
defer cf()
err = db.PingContext(ctx)
if err != nil {
return nil, err
}
return db, nil
}
// CheckDBVersion compares the DB version with the SQL migrations
func (b *Bot) CheckDBVersion(c *config.Config) (uint, error) {
ll := b.Log.With().Str("context", "bot.CheckDBVersion").Logger()
dsn := getDBDSN(c)
m, err := migrate.New(MigrationsPath, dsn)
if err != nil {
return 0, err
}
cv, _, err := m.Version()
if err != nil && !errors.Is(err, migrate.ErrNilVersion) {
return 0, err
}
defer func() {
if serr, derr := m.Close(); serr != nil || derr != nil {
if serr != nil {
ll.Warn().Msgf(ErrMigrateCloseSourceConnection, serr)
}
if derr != nil {
ll.Warn().Msgf(ErrMigrateCloseDBConnection, derr)
}
}
}()
var mc uint = 0
mr := "./sql_migrations"
fileSystem := os.DirFS(mr)
if err := fs.WalkDir(fileSystem, ".", func(p string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if strings.HasSuffix(p, ".up.sql") {
mc++
}
return nil
}); err != nil {
return 0, err
}
if cv < mc {
return mc - cv, nil
}
return 0, nil
}
// SQLMigrate migrates the database to the latest SQL set
func (b *Bot) SQLMigrate(c *config.Config) error {
ll := b.Log.With().Str("context", "bot.SQLMigrate").Logger()
dsn := getDBDSN(c)
m, err := migrate.New(MigrationsPath, dsn)
if err != nil {
return err
}
defer func() {
if serr, derr := m.Close(); serr != nil || derr != nil {
if serr != nil {
ll.Warn().Msgf(ErrMigrateCloseSourceConnection, serr)
}
if derr != nil {
ll.Warn().Msgf(ErrMigrateCloseDBConnection, derr)
}
}
}()
cv, _, err := m.Version()
if err != nil && !errors.Is(err, migrate.ErrNilVersion) {
return err
}
if err := m.Up(); err != nil {
switch {
case errors.Is(err, migrate.ErrNoChange):
ll.Info().Msg("database is already on the latest version")
return nil
default:
return err
}
}
nv, _, err := m.Version()
if err != nil {
return err
}
ll.Info().Msgf("successfully updated database from v%d to v%d", cv, nv)
return nil
}
// SQLDowngrade migrates the database to the latest SQL set
func (b *Bot) SQLDowngrade(c *config.Config) error {
ll := b.Log.With().Str("context", "bot.SQLDowngrade").Logger()
dsn := getDBDSN(c)
m, err := migrate.New(MigrationsPath, dsn)
if err != nil {
return err
}
defer func() {
if serr, derr := m.Close(); serr != nil || derr != nil {
if serr != nil {
ll.Warn().Msgf(ErrMigrateCloseSourceConnection, serr)
}
if derr != nil {
ll.Warn().Msgf(ErrMigrateCloseDBConnection, derr)
}
}
}()
if err := m.Steps(-1); err != nil {
switch {
case errors.Is(err, migrate.ErrNoChange):
ll.Info().Msg("database is already on the latest version")
return nil
default:
return err
}
}
cv, _, err := m.Version()
if err != nil && !errors.Is(err, migrate.ErrNilVersion) {
return err
}
ll.Info().Msgf("successfully downgraded database to v%d", cv)
return nil
}
// getDBDSN returns the DB connection string based on the given config
func getDBDSN(c *config.Config) string {
var dp string
if c.DB.UseTLS {
dp += "sslmode=verify-full"
}
if !c.DB.UseTLS {
dp += "sslmode=disable"
}
return fmt.Sprintf("postgres://%s:%s@%s:%d/%s?%s", c.DB.Username, c.DB.Password, c.DB.Host,
c.DB.Port, c.DB.Database, dp)
}