// Create a source schema from given named source
// we will find Source for that name and introspect
func createSchema(sourceName string) (*schema.Schema, bool) {
sourceName = strings.ToLower(sourceName)
ss := schema.NewSchemaSource(sourceName, sourceName)
ds := registry.Get(sourceName)
if ds == nil {
parts := strings.SplitN(sourceName, "://", 2)
//u.Infof("parts: %d %v", len(parts), parts)
if len(parts) == 2 {
ds = registry.Get(parts[0])
if ds == nil {
//return &qlbConn{schema: s, connInfo: parts[1]}, nil
u.Warnf("not able to find schema %q", sourceName)
return nil, false
}
} else {
//u.WarnT(7)
u.Warnf("not able to find schema %q", sourceName)
return nil, false
}
}
u.Infof("reg p:%p source=%q ds %#v tables:%v", registry, sourceName, ds, ds.Tables())
ss.DS = ds
schema := schema.NewSchema(sourceName)
ss.Schema = schema
u.Debugf("schema:%p ss:%p createSchema(%q) NEW ", schema, ss, sourceName)
loadSchema(ss)
return schema, true
}
// 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
}
// 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
}
