func loadSchema(ss *schema.SchemaSource) error {
//u.WarnT(6)
if ss.DS == nil {
u.Warnf("missing DataSource for %s", ss.Name)
return fmt.Errorf("Missing datasource for %q", ss.Name)
}
if dsConfig, getsConfig := ss.DS.(schema.SourceSetup); getsConfig {
if err := dsConfig.Setup(ss); err != nil {
u.Errorf("Error setuping up %v %v", ss.Name, err)
return err
}
}
for _, tableName := range ss.DS.Tables() {
ss.AddTableName(tableName)
//u.Debugf("table %q", tableName)
}
ss.Schema.AddSourceSchema(ss)
// Intercept and create info schema
loadSystemSchema(ss)
return nil
}
// NewMemDbForSchema creates a MemDb with given indexes, columns
func NewMemDbForSchema(name string, ss *schema.SchemaSource, cols []string) (*MemDb, error) {
if len(cols) < 1 {
return nil, fmt.Errorf("must have columns provided")
}
m := &MemDb{}
m.tbl = schema.NewTable(name, ss)
ss.AddTable(m.tbl)
if ss.Schema == nil {
m.Schema = schema.NewSchema(name)
m.Schema.AddSourceSchema(ss)
} else {
m.Schema = ss.Schema
}
m.tbl.SetColumns(cols)
err := m.buildDefaultIndexes()
if err != nil {
u.Errorf("Default indexes could not be built %v", err)
return nil, err
}
mdbSchema, err := makeMemDbSchema(m)
if err != nil {
u.Errorf("Must have valid schema %v", err)
return nil, err
}
db, err := memdb.NewMemDB(mdbSchema)
if err != nil {
u.Warnf("could not create db %v", err)
return nil, err
}
m.db = db
return m, nil
}
// We are going to Create an 'information_schema' for given schema
func loadSystemSchema(ss *schema.SchemaSource) error {
s := ss.Schema
if s == nil {
return fmt.Errorf("Must have schema but was nil")
}
infoSchema := s.InfoSchema
var infoSchemaSource *schema.SchemaSource
if infoSchema == nil {
infoSchemaSource = schema.NewSchemaSource("schema", "schema")
//u.Infof("reg p:%p ds %#v tables:%v", registry, ds, ds.Tables())
schemaDb := NewSchemaDb(s)
infoSchemaSource.DS = schemaDb
infoSchema = schema.NewSchema("schema")
schemaDb.is = infoSchema
//u.Debugf("schema:%p ss:%p loadSystemSchema: NEW infoschema:%p s:%s ss:%s", s, ss, infoSchema, s.Name, ss.Name)
infoSchemaSource.Schema = infoSchema
infoSchemaSource.AddTableName("tables")
infoSchema.SchemaSources["schema"] = infoSchemaSource
infoSchema.InfoSchema = infoSchema
} else {
infoSchemaSource = infoSchema.SchemaSources["schema"]
}
// For each table in source schema
for _, tableName := range ss.Tables() {
//u.Debugf("adding table: %q to infoSchema %p", tableName, infoSchema)
_, err := ss.Table(tableName)
if err != nil {
u.Warnf("Missing table?? %q", tableName)
continue
}
infoSchemaSource.AddTableName(tableName)
}
s.InfoSchema = infoSchema
s.RefreshSchema()
//u.Debugf("s:%p ss:%p infoschema:%p name:%s", s, ss, infoSchema, s.Name)
return nil
}