/
convert.go
241 lines (216 loc) · 6.37 KB
/
convert.go
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package run
import (
"bytes"
"log"
"github.com/pkg/errors"
"gnorm.org/gnorm/database"
"gnorm.org/gnorm/run/data"
)
type nameConverter func(s string) (string, error)
func makeData(log *log.Logger, info *database.Info, cfg *Config) (*data.DBData, error) {
convert := func(s string) (string, error) {
buf := &bytes.Buffer{}
err := cfg.NameConversion.Execute(buf, s)
if err != nil {
return "", errors.WithMessage(err, "name conversion failed for "+s)
}
return buf.String(), nil
}
db := &data.DBData{
SchemasByName: make(map[string]*data.Schema, len(info.Schemas)),
}
var err error
for _, s := range info.Schemas {
sch := &data.Schema{
DBName: s.Name,
TablesByName: make(map[string]*data.Table, len(s.Tables)),
}
db.Schemas = append(db.Schemas, sch)
db.SchemasByName[sch.DBName] = sch
sch.Name, err = convert(s.Name)
if err != nil {
return nil, errors.WithMessage(err, "schema")
}
for _, e := range s.Enums {
enum := &data.Enum{
DBName: e.Name,
Schema: sch,
}
sch.Enums = append(sch.Enums, enum)
enum.Name, err = convert(e.Name)
if err != nil {
return nil, errors.WithMessage(err, "enum")
}
for _, v := range e.Values {
val := &data.EnumValue{
DBName: v.Name,
Value: v.Value,
}
enum.Values = append(enum.Values, val)
val.Name, err = convert(v.Name)
if err != nil {
return nil, errors.WithMessage(err, "enum value")
}
}
}
for _, t := range s.Tables {
table := &data.Table{
DBName: t.Name,
Comment: t.Comment,
Schema: sch,
ColumnsByName: make(map[string]*data.Column, len(t.Columns)),
IndexesByName: make(map[string]*data.Index, len(t.Indexes)),
FKByName: map[string]*data.ForeignKey{},
FKRefsByName: map[string]*data.ForeignKey{},
}
sch.Tables = append(sch.Tables, table)
sch.TablesByName[table.DBName] = table
table.Name, err = convert(t.Name)
if err != nil {
return nil, errors.WithMessage(err, "table")
}
for _, c := range t.Columns {
col := &data.Column{
Table: table,
DBName: c.Name,
DBType: c.Type,
IsArray: c.IsArray,
Length: c.Length,
UserDefined: c.UserDefined,
Nullable: c.Nullable,
HasDefault: c.HasDefault,
Comment: c.Comment,
IsPrimaryKey: c.IsPrimaryKey,
IsFK: c.IsForeignKey,
FKColumnRefsByName: map[string]*data.ForeignKeyColumn{},
Orig: c.Orig,
}
table.Columns = append(table.Columns, col)
table.ColumnsByName[col.DBName] = col
col.Name, err = convert(c.Name)
if err != nil {
return nil, errors.WithMessage(err, "column")
}
var ok bool
if c.Nullable {
col.Type, ok = cfg.NullableTypeMap[c.Type]
if !ok {
log.Println("Unmapped nullable type:", c.Type)
}
} else {
col.Type, ok = cfg.TypeMap[c.Type]
if !ok {
log.Println("Unmapped type:", c.Type)
}
}
}
table.PrimaryKeys = filterPrimaryKeyColumns(table.Columns)
for _, i := range t.Indexes {
index := &data.Index{
DBName: i.Name,
IsUnique: i.IsUnique,
}
for _, c := range i.Columns {
index.Columns = append(index.Columns, table.ColumnsByName[c.Name])
}
index.Name, err = convert(i.Name)
if err != nil {
return nil, errors.WithMessage(err, "index")
}
table.Indexes = append(table.Indexes, index)
table.IndexesByName[index.DBName] = index
}
}
if err = mapSchemaForeignKeyReferences(s, sch, convert); err != nil {
return nil, err
}
}
return db, nil
}
func filterPrimaryKeyColumns(columns data.Columns) data.Columns {
var pkColumns data.Columns
for _, column := range columns {
if column.IsPrimaryKey {
pkColumns = append(pkColumns, column)
}
}
return pkColumns
}
func mapSchemaForeignKeyReferences(isch *database.Schema, sch *data.Schema, convert nameConverter) error {
for _, t := range isch.Tables {
table, ok := sch.TablesByName[t.Name]
if !ok {
log.Printf("Unmapped table %v in %v", t.Name, isch.Name)
continue
}
fkColumnsByFKNames := map[string]data.ForeignKeyColumns{}
for _, c := range t.Columns {
column, ok := table.ColumnsByName[c.Name]
if !ok {
log.Printf("Unmapped column %v in %v.%v", c.Name, isch.Name, t.Name)
continue
}
if column.IsFK {
refTable, ok := sch.TablesByName[c.ForeignKey.ForeignTableName]
if !ok {
log.Printf("Unmapped foreign table %v in %v", c.ForeignKey.ForeignTableName, isch.Name)
continue
}
refColumn, ok := refTable.ColumnsByName[c.ForeignKey.ForeignColumnName]
if !ok {
log.Printf("Unmapped foreign column %v in %v.%v", c.ForeignKey.ForeignColumnName, isch.Name, c.ForeignKey.ForeignTableName)
continue
}
fkColumn := &data.ForeignKeyColumn{
DBName: c.ForeignKey.Name,
ColumnDBName: column.DBName,
RefColumnDBName: refColumn.DBName,
Column: column,
RefColumn: refColumn,
}
column.FKColumn = fkColumn
refColumn.HasFKRef = true
refColumn.FKColumnRefs = append(refColumn.FKColumnRefs, fkColumn)
refColumn.FKColumnRefsByName[fkColumn.DBName] = fkColumn
if _, ok := fkColumnsByFKNames[fkColumn.DBName]; !ok {
fkColumnsByFKNames[fkColumn.DBName] = data.ForeignKeyColumns{fkColumn}
} else {
fkColumnsByFKNames[fkColumn.DBName] = append(fkColumnsByFKNames[fkColumn.DBName], fkColumn)
}
}
}
for _, fkc := range fkColumnsByFKNames {
err := mapForeignTable(fkc, convert)
if err != nil {
return err
}
}
}
return nil
}
func mapForeignTable(fkc data.ForeignKeyColumns, convert nameConverter) error {
if len(fkc) == 0 {
return nil
}
// All ForeignKeyColumns will point to same table/refTable and have the same name, use first one
table := fkc[0].Column.Table
refTable := fkc[0].RefColumn.Table
cName, err := convert(fkc[0].DBName)
if err != nil {
return errors.Wrap(err, "foreign key")
}
fk := &data.ForeignKey{
DBName: fkc[0].DBName,
Name: cName,
TableDBName: table.DBName,
RefTableDBName: refTable.DBName,
Table: table,
RefTable: refTable,
FKColumns: fkc,
}
table.ForeignKeys = append(table.ForeignKeys, fk)
refTable.ForeignKeyRefs = append(table.ForeignKeyRefs, fk)
table.FKByName[fk.DBName] = fk
refTable.FKRefsByName[fk.DBName] = fk
return nil
}