442 lines
8.7 KiB
Go
442 lines
8.7 KiB
Go
package psql
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import (
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"fmt"
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"strings"
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"github.com/gobuffalo/flect"
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)
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type DBSchema struct {
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ver int
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t map[string]*DBTableInfo
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rm map[string]map[string]*DBRel
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}
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type DBTableInfo struct {
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Name string
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Type string
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IsSingular bool
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Columns []DBColumn
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PrimaryCol *DBColumn
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TSVCol *DBColumn
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ColMap map[string]*DBColumn
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ColIDMap map[int16]*DBColumn
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Singular string
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Plural string
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}
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type RelType int
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const (
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RelOneToOne RelType = iota + 1
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RelOneToMany
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RelOneToManyThrough
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RelEmbedded
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RelRemote
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)
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type DBRel struct {
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Type RelType
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Through string
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ColT string
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Left struct {
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col *DBColumn
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Table string
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Col string
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Array bool
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}
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Right struct {
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col *DBColumn
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Table string
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Col string
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Array bool
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}
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}
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func NewDBSchema(info *DBInfo, aliases map[string][]string) (*DBSchema, error) {
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schema := &DBSchema{
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t: make(map[string]*DBTableInfo),
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rm: make(map[string]map[string]*DBRel),
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}
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for i, t := range info.Tables {
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err := schema.addTable(t, info.Columns[i], aliases)
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if err != nil {
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return nil, err
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}
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}
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for i, t := range info.Tables {
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err := schema.firstDegreeRels(t, info.Columns[i])
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if err != nil {
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return nil, err
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}
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}
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for i, t := range info.Tables {
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err := schema.secondDegreeRels(t, info.Columns[i])
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if err != nil {
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return nil, err
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}
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}
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return schema, nil
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}
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func (s *DBSchema) addTable(
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t DBTable, cols []DBColumn, aliases map[string][]string) error {
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colmap := make(map[string]*DBColumn, len(cols))
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colidmap := make(map[int16]*DBColumn, len(cols))
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singular := flect.Singularize(t.Key)
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plural := flect.Pluralize(t.Key)
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s.t[singular] = &DBTableInfo{
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Name: t.Name,
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Type: t.Type,
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IsSingular: true,
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Columns: cols,
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ColMap: colmap,
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ColIDMap: colidmap,
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Singular: singular,
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Plural: plural,
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}
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s.t[plural] = &DBTableInfo{
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Name: t.Name,
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Type: t.Type,
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IsSingular: false,
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Columns: cols,
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ColMap: colmap,
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ColIDMap: colidmap,
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Singular: singular,
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Plural: plural,
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}
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if al, ok := aliases[t.Key]; ok {
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for i := range al {
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k1 := flect.Singularize(al[i])
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s.t[k1] = s.t[singular]
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k2 := flect.Pluralize(al[i])
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s.t[k2] = s.t[plural]
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}
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}
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for i := range cols {
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c := &cols[i]
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switch {
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case c.Type == "tsvector":
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s.t[singular].TSVCol = c
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s.t[plural].TSVCol = c
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case c.PrimaryKey:
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s.t[singular].PrimaryCol = c
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s.t[plural].PrimaryCol = c
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}
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colmap[c.Key] = c
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colidmap[c.ID] = c
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}
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return nil
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}
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func (s *DBSchema) firstDegreeRels(t DBTable, cols []DBColumn) error {
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ct := t.Key
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cti, ok := s.t[ct]
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if !ok {
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return fmt.Errorf("invalid foreign key table '%s'", ct)
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}
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for i := range cols {
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c := cols[i]
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if len(c.FKeyTable) == 0 {
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continue
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}
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// Foreign key column name
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ft := strings.ToLower(c.FKeyTable)
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ti, ok := s.t[ft]
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if !ok {
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return fmt.Errorf("invalid foreign key table '%s'", ft)
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}
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// This is an embedded relationship like when a json/jsonb column
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// is exposed as a table
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if c.Name == c.FKeyTable && len(c.FKeyColID) == 0 {
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rel := &DBRel{Type: RelEmbedded}
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rel.Left.col = cti.PrimaryCol
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rel.Left.Table = cti.Name
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rel.Left.Col = cti.PrimaryCol.Name
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rel.Right.col = &c
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rel.Right.Table = ti.Name
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rel.Right.Col = c.Name
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if err := s.SetRel(ft, ct, rel); err != nil {
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return err
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}
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continue
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}
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if len(c.FKeyColID) == 0 {
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continue
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}
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// Foreign key column id
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fcid := c.FKeyColID[0]
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fc, ok := ti.ColIDMap[fcid]
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if !ok {
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return fmt.Errorf("invalid foreign key column id '%d' for table '%s'",
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fcid, ti.Name)
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}
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var rel1, rel2 *DBRel
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// One-to-many relation between current table and the
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// table in the foreign key
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if fc.UniqueKey {
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rel1 = &DBRel{Type: RelOneToOne}
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} else {
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rel1 = &DBRel{Type: RelOneToMany}
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}
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rel1.Left.col = &c
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rel1.Left.Table = t.Name
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rel1.Left.Col = c.Name
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rel1.Left.Array = c.Array
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rel1.Right.col = fc
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rel1.Right.Table = c.FKeyTable
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rel1.Right.Col = fc.Name
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rel1.Right.Array = fc.Array
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if err := s.SetRel(ct, ft, rel1); err != nil {
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return err
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}
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// One-to-many reverse relation between the foreign key table and the
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// the current table
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if c.UniqueKey {
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rel2 = &DBRel{Type: RelOneToOne}
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} else {
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rel2 = &DBRel{Type: RelOneToMany}
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}
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rel2.Left.col = fc
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rel2.Left.Table = c.FKeyTable
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rel2.Left.Col = fc.Name
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rel2.Left.Array = fc.Array
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rel2.Right.col = &c
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rel2.Right.Table = t.Name
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rel2.Right.Col = c.Name
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rel2.Right.Array = c.Array
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if err := s.SetRel(ft, ct, rel2); err != nil {
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return err
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}
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}
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return nil
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}
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func (s *DBSchema) secondDegreeRels(t DBTable, cols []DBColumn) error {
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jcols := make([]DBColumn, 0, len(cols))
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ct := t.Key
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cti, ok := s.t[ct]
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if !ok {
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return fmt.Errorf("invalid foreign key table '%s'", ct)
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}
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for i := range cols {
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c := cols[i]
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if len(c.FKeyTable) == 0 {
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continue
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}
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// Foreign key column name
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ft := strings.ToLower(c.FKeyTable)
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ti, ok := s.t[ft]
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if !ok {
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return fmt.Errorf("invalid foreign key table '%s'", ft)
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}
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// This is an embedded relationship like when a json/jsonb column
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// is exposed as a table
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if c.Name == c.FKeyTable && len(c.FKeyColID) == 0 {
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continue
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}
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if len(c.FKeyColID) == 0 {
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continue
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}
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// Foreign key column id
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fcid := c.FKeyColID[0]
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if _, ok := ti.ColIDMap[fcid]; !ok {
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return fmt.Errorf("invalid foreign key column id '%d' for table '%s'",
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fcid, ti.Name)
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}
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jcols = append(jcols, c)
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}
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// If table contains multiple foreign key columns it's a possible
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// join table for many-to-many relationships or multiple one-to-many
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// relations
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// Below one-to-many relations use the current table as the
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// join table aka through table.
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if len(jcols) > 1 {
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for i := range jcols {
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for n := range jcols {
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if n == i {
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continue
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}
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err := s.updateSchemaOTMT(cti, jcols[i], jcols[n])
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if err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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func (s *DBSchema) updateSchemaOTMT(
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ti *DBTableInfo, col1, col2 DBColumn) error {
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t1 := strings.ToLower(col1.FKeyTable)
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t2 := strings.ToLower(col2.FKeyTable)
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fc1, ok := s.t[t1].ColIDMap[col1.FKeyColID[0]]
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if !ok {
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return fmt.Errorf("invalid foreign key column id '%d' for table '%s'",
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col1.FKeyColID[0], ti.Name)
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}
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fc2, ok := s.t[t2].ColIDMap[col2.FKeyColID[0]]
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if !ok {
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return fmt.Errorf("invalid foreign key column id '%d' for table '%s'",
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col2.FKeyColID[0], ti.Name)
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}
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// One-to-many-through relation between 1nd foreign key table and the
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// 2nd foreign key table
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rel1 := &DBRel{Type: RelOneToManyThrough}
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rel1.Through = ti.Name
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rel1.ColT = col2.Name
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rel1.Left.col = &col2
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rel1.Left.Table = col2.FKeyTable
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rel1.Left.Col = fc2.Name
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rel1.Right.col = &col1
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rel1.Right.Table = ti.Name
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rel1.Right.Col = col1.Name
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if err := s.SetRel(t1, t2, rel1); err != nil {
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return err
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}
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// One-to-many-through relation between 2nd foreign key table and the
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// 1nd foreign key table
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rel2 := &DBRel{Type: RelOneToManyThrough}
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rel2.Through = ti.Name
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rel2.ColT = col1.Name
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rel1.Left.col = fc1
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rel2.Left.Table = col1.FKeyTable
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rel2.Left.Col = fc1.Name
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rel1.Right.col = &col2
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rel2.Right.Table = ti.Name
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rel2.Right.Col = col2.Name
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if err := s.SetRel(t2, t1, rel2); err != nil {
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return err
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}
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return nil
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}
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func (s *DBSchema) GetTableNames() []string {
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var names []string
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for name, _ := range s.t {
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names = append(names, name)
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}
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return names
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}
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func (s *DBSchema) GetTable(table string) (*DBTableInfo, error) {
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t, ok := s.t[table]
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if !ok {
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return nil, fmt.Errorf("unknown table '%s'", table)
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}
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return t, nil
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}
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func (s *DBSchema) SetRel(child, parent string, rel *DBRel) error {
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sp := strings.ToLower(flect.Singularize(parent))
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pp := strings.ToLower(flect.Pluralize(parent))
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sc := strings.ToLower(flect.Singularize(child))
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pc := strings.ToLower(flect.Pluralize(child))
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if _, ok := s.rm[sc]; !ok {
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s.rm[sc] = make(map[string]*DBRel)
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}
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if _, ok := s.rm[pc]; !ok {
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s.rm[pc] = make(map[string]*DBRel)
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}
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if _, ok := s.rm[sc][sp]; !ok {
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s.rm[sc][sp] = rel
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}
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if _, ok := s.rm[sc][pp]; !ok {
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s.rm[sc][pp] = rel
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}
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if _, ok := s.rm[pc][sp]; !ok {
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s.rm[pc][sp] = rel
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}
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if _, ok := s.rm[pc][pp]; !ok {
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s.rm[pc][pp] = rel
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}
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return nil
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}
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func (s *DBSchema) GetRel(child, parent string) (*DBRel, error) {
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rel, ok := s.rm[child][parent]
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if !ok {
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// No relationship found so this time fetch the table info
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// and try again in case child or parent was an alias
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ct, err := s.GetTable(child)
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if err != nil {
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return nil, err
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}
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pt, err := s.GetTable(parent)
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if err != nil {
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return nil, err
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}
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rel, ok = s.rm[ct.Name][pt.Name]
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if !ok {
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return nil, fmt.Errorf("unknown relationship '%s' -> '%s'",
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child, parent)
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}
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}
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return rel, nil
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}
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