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automigrate.go
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231 lines (197 loc) · 4.75 KB
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package hades
import (
"fmt"
"reflect"
"strings"
"time"
"crawshaw.io/sqlite"
"crawshaw.io/sqlite/sqlitex"
)
type AutoMigrateStats struct {
NumCreated int64
NumMigrated int64
NumCurrent int64
}
func (c *Context) AutoMigrate(conn *sqlite.Conn) error {
return c.AutoMigrateEx(conn, &AutoMigrateStats{})
}
func (c *Context) AutoMigrateEx(conn *sqlite.Conn, stats *AutoMigrateStats) error {
for _, m := range c.ScopeMap.byDBName {
err := c.syncTable(conn, stats, m.GetModelStruct())
if err != nil {
return err
}
}
return nil
}
func (c *Context) syncTable(conn *sqlite.Conn, stats *AutoMigrateStats, ms *ModelStruct) (err error) {
tableName := ms.TableName
pti, err := c.PragmaTableInfo(conn, tableName)
if err != nil {
return err
}
if len(pti) == 0 {
stats.NumCreated++
return c.createTable(conn, ms)
}
// migrate table in transaction
defer sqlitex.Save(conn)(&err)
err = c.ExecRaw(conn, "PRAGMA foreign_keys = 0", nil)
if err != nil {
return err
}
oldColumns := make(map[string]PragmaTableInfoRow)
for _, ptir := range pti {
oldColumns[ptir.Name] = ptir
}
numOldCols := len(oldColumns)
numNewCols := 0
isMissingCols := false
{
var processField func(sf *StructField)
processField = func(sf *StructField) {
if sf.IsSquashed {
for _, nsf := range sf.SquashedFields {
processField(nsf)
}
}
if !sf.IsNormal {
return
}
numNewCols++
if _, ok := oldColumns[sf.DBName]; !ok {
isMissingCols = true
return
}
}
for _, sf := range ms.StructFields {
processField(sf)
}
}
if !isMissingCols && numOldCols == numNewCols {
// all done
stats.NumCurrent++
return nil
}
stats.NumMigrated++
tempName := fmt.Sprintf("__hades_migrate__%s__%d__", tableName, time.Now().UnixNano())
err = c.ExecRaw(conn, fmt.Sprintf("CREATE TABLE %s AS SELECT * FROM %s", tempName, tableName), nil)
if err != nil {
return err
}
err = c.dropTable(conn, tableName)
if err != nil {
return err
}
err = c.createTable(conn, ms)
if err != nil {
return err
}
var columns []string
{
var processField func(sf *StructField)
processField = func(sf *StructField) {
if sf.IsSquashed {
for _, nsf := range sf.SquashedFields {
processField(nsf)
}
}
if !sf.IsNormal {
return
}
if _, ok := oldColumns[sf.DBName]; ok {
columns = append(columns, EscapeIdentifier(sf.DBName))
}
}
for _, sf := range ms.StructFields {
processField(sf)
}
}
var columnList = strings.Join(columns, ",")
query := fmt.Sprintf("INSERT INTO %s (%s) SELECT %s FROM %s",
tableName,
columnList,
columnList,
tempName,
)
err = c.ExecRaw(conn, query, nil)
if err != nil {
return err
}
err = c.dropTable(conn, tempName)
if err != nil {
return err
}
err = c.ExecRaw(conn, "PRAGMA foreign_keys = 1", nil)
if err != nil {
return err
}
return nil
}
func (c *Context) createTable(conn *sqlite.Conn, ms *ModelStruct) error {
query := fmt.Sprintf("CREATE TABLE %s", EscapeIdentifier(ms.TableName))
var columns []string
var pks []string
var processField func(sf *StructField) error
processField = func(sf *StructField) error {
if sf.IsSquashed {
for _, nsf := range sf.SquashedFields {
err := processField(nsf)
if err != nil {
return err
}
}
}
if !sf.IsNormal {
return nil
}
var sqliteType string
typ := sf.Struct.Type
if typ.Kind() == reflect.Ptr {
typ = typ.Elem()
}
switch typ.Kind() {
case reflect.Int64, reflect.Int32, reflect.Int16, reflect.Int8, reflect.Int,
reflect.Uint64, reflect.Uint32, reflect.Uint16, reflect.Uint8, reflect.Uint:
sqliteType = "INTEGER"
case reflect.Bool:
sqliteType = "BOOLEAN"
case reflect.Float64, reflect.Float32:
sqliteType = "REAL"
case reflect.String:
sqliteType = "TEXT"
case reflect.Struct:
if typ == reflect.TypeOf(time.Time{}) {
sqliteType = "DATETIME"
break
}
fallthrough
default:
return fmt.Errorf("Unsupported model field type: %v (in model %v)", sf.Struct.Type, ms.ModelType)
}
modifier := ""
if sf.IsPrimaryKey {
pks = append(pks, sf.DBName)
modifier = " NOT NULL"
}
column := fmt.Sprintf(`%s %s%s`, EscapeIdentifier(sf.DBName), sqliteType, modifier)
columns = append(columns, column)
return nil
}
for _, sf := range ms.StructFields {
err := processField(sf)
if err != nil {
return err
}
}
if len(pks) > 0 {
columns = append(columns, fmt.Sprintf("PRIMARY KEY (%s)", strings.Join(pks, ", ")))
} else {
return fmt.Errorf("Model %v has no primary keys", ms.ModelType)
}
query = fmt.Sprintf("%s (%s)", query, strings.Join(columns, ", "))
return c.ExecRaw(conn, query, nil)
}
func (c *Context) dropTable(conn *sqlite.Conn, tableName string) error {
return c.ExecRaw(conn, fmt.Sprintf("DROP TABLE %s", EscapeIdentifier(tableName)), nil)
}