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migrator.go
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migrator.go
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package psqlfront
import (
_ "embed"
"fmt"
"log"
"os"
"strings"
"github.com/k0kubun/sqldef/database"
"github.com/k0kubun/sqldef/database/postgres"
"github.com/k0kubun/sqldef/parser"
"github.com/k0kubun/sqldef/schema"
"github.com/samber/lo"
)
type Migrator struct {
parser database.GenericParser
target database.Config
disableSSL bool
preferSSL bool
}
func NewMigrator(cfg *CacheDatabaseConfig) *Migrator {
sqlParser := database.NewParser(parser.ParserModePostgres)
return &Migrator{
parser: sqlParser,
target: database.Config{
DbName: cfg.Database,
User: cfg.Username,
Password: cfg.Password,
Host: cfg.Host,
Port: cfg.Port,
},
disableSSL: cfg.SSLMode == "disable",
preferSSL: cfg.SSLMode == "prefer",
}
}
//go:embed sql/psqlfront.sql
var baseDDL string
func (m *Migrator) GenerateDesiredDDLs(tables []*Table) (string, error) {
var builder strings.Builder
builder.WriteString(baseDDL)
builder.WriteRune('\n')
for _, table := range tables {
ddl, err := table.GenerateDDL()
if err != nil {
return "", fmt.Errorf("table `%s`:%w", table.String(), err)
}
builder.WriteString(ddl)
builder.WriteRune('\n')
}
return builder.String(), nil
}
func (m *Migrator) GenerateCreateSchemaStmt(tables []*Table) string {
if tables == nil {
tables = make([]*Table, 0)
}
schemas := lo.Uniq(append([]string{"psqlfront"}, lo.Uniq(lo.Map(tables, func(t *Table, _ int) string {
return t.SchemaName
}))...))
var builder strings.Builder
for _, schema := range schemas {
fmt.Fprintf(&builder, `CREATE SCHEMA IF NOT EXISTS "%s";`, schema)
builder.WriteRune('\n')
}
return builder.String()
}
func (m *Migrator) ExecuteMigration(tables []*Table) error {
desiredDDLs, err := m.GenerateDesiredDDLs(tables)
if err != nil {
return err
}
beforeApply := m.GenerateCreateSchemaStmt(tables)
return m.executeMigration(desiredDDLs, beforeApply)
}
func (m *Migrator) executeMigration(desiredDDLs string, beforeApply string) error {
if m.disableSSL {
originalEnv := os.Getenv("PGSSLMODE")
os.Setenv("PGSSLMODE", "disable")
defer func() {
os.Setenv("PGSSLMODE", originalEnv)
}()
}
targetDB, err := postgres.NewDatabase(m.target)
if err != nil {
return err
}
defer targetDB.Close()
currentDDLs, err := targetDB.DumpDDLs()
if err != nil {
if strings.Contains(err.Error(), "SSL is not enabled") && m.preferSSL {
log.Println("[debug] ssl_mode prefer retry migrate on ssl disable")
originalEnv := os.Getenv("PGSSLMODE")
os.Setenv("PGSSLMODE", "disable")
targetDB, err = postgres.NewDatabase(m.target)
if err != nil {
return err
}
os.Setenv("PGSSLMODE", originalEnv)
currentDDLs, err = targetDB.DumpDDLs()
if err != nil {
return err
}
} else {
return fmt.Errorf("failed dump target db ddls:%w", err)
}
}
ddls, err := schema.GenerateIdempotentDDLs(schema.GeneratorModePostgres, m.parser, desiredDDLs, currentDDLs, database.GeneratorConfig{})
if err != nil {
return fmt.Errorf("generate idempotent DDLs:%w", err)
}
if len(ddls) == 0 {
log.Println("[info] migration nothing to do")
return nil
}
log.Printf("[info] need execute migration")
if err := database.RunDDLs(targetDB, ddls, false, beforeApply); err != nil {
return fmt.Errorf("run DDLs:%w", err)
}
return nil
}