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