func newConfig(conf *config.URL) (*Cache, error) {
cache := &Cache{
Logger: log.Std,
}
if codecName := conf.Fragment.Get("codec"); codecName != "" {
cache.codec = codec.Get(codecName)
if cache.codec == nil {
if imp := codec.RequiredImport(codecName); imp != "" {
return nil, fmt.Errorf("please import %q to use the codec %q", imp, codecName)
}
return nil, fmt.Errorf("unknown codec %q, maybe you forgot an import?", codecName)
}
} else {
cache.codec = codec.Get("gob")
}
cache.prefix = conf.Fragment.Get("prefix")
cache.prefixLen = len(cache.prefix)
if pipeName := conf.Fragment.Get("pipe"); pipeName != "" {
cache.pipe = pipe.Get(pipeName)
if cache.pipe == nil {
if imp := pipe.RequiredImport(pipeName); imp != "" {
return nil, fmt.Errorf("please import %q to use the pipe %q", imp, pipeName)
}
return nil, fmt.Errorf("unknown pipe %q, maybe you forgot an import?", pipeName)
}
}
var opener driver.Opener
if conf.Scheme != "" {
opener = driver.Get(conf.Scheme)
if opener == nil {
if imp := imports[conf.Scheme]; imp != "" {
return nil, fmt.Errorf("please import %q to use the cache driver %q", imp, conf.Scheme)
}
return nil, fmt.Errorf("unknown cache driver %q, maybe you forgot an import?", conf.Scheme)
}
} else {
opener = driver.Get("dummy")
}
var err error
if cache.driver, err = opener(conf); err != nil {
return nil, err
}
return cache, nil
}
func (o *Orm) fields(table string, s *structs.Struct) (*driver.Fields, map[string]*reference, error) {
methods, err := driver.MakeMethods(s.Type)
if err != nil {
return nil, nil, err
}
fields := &driver.Fields{
Struct: s,
PrimaryKey: -1,
Methods: methods,
}
var references map[string]*reference
for ii, v := range s.QNames {
// XXX: Check if this quoting is enough
fields.QuotedNames = append(fields.QuotedNames, fmt.Sprintf("\"%s\".\"%s\"", table, s.MNames[ii]))
t := s.Types[ii]
ftag := s.Tags[ii]
// Check encoded types
if cn := ftag.CodecName(); cn != "" {
if codec.Get(cn) == nil {
if imp := codec.RequiredImport(cn); imp != "" {
return nil, nil, fmt.Errorf("please import %q to use the codec %q", imp, cn)
}
return nil, nil, fmt.Errorf("can't find codec %q. Perhaps you missed an import?", cn)
}
} else {
switch t.Kind() {
case reflect.Array, reflect.Chan, reflect.Func, reflect.Interface, reflect.Map:
return nil, nil, fmt.Errorf("field %q in struct %s has invalid type %s", v, s.Type, t)
}
}
if pn := ftag.PipeName(); pn != "" {
// Check if the field has a codec and the pipe exists
if ftag.CodecName() == "" {
return nil, nil, fmt.Errorf("field %q has pipe %s but no codec - only encoded types can use pipes", v, pn)
}
if pipe.FromTag(ftag) == nil {
return nil, nil, fmt.Errorf("can't find ORM pipe %q. Perhaps you missed an import?", pn)
}
}
// Struct has flattened types, but we need to original type
// to determine if it should be nullempty or omitempty by default
field := s.Type.FieldByIndex(s.Indexes[ii])
fields.OmitEmpty = append(fields.OmitEmpty, ftag.Has("omitempty") || (defaultsToOmitEmpty(field.Type, ftag) && !ftag.Has("notomitempty")))
fields.NullEmpty = append(fields.NullEmpty, ftag.Has("nullempty") || (defaultsToNullEmpty(field.Type, ftag) && !ftag.Has("notnullempty")))
if ftag.Has("primary_key") {
if fields.PrimaryKey >= 0 {
return nil, nil, fmt.Errorf("duplicate primary_key in struct %v (%s and %s)", s.Type, s.QNames[fields.PrimaryKey], v)
}
fields.PrimaryKey = ii
}
if ftag.Has("auto_increment") {
if k := types.Kind(t.Kind()); k != types.Int && k != types.Uint {
return nil, nil, fmt.Errorf("auto_increment field %q in struct %s must be of integer type (signed or unsigned", v, s.Type)
}
fields.AutoincrementPk = fields.PrimaryKey == ii
}
if ref := ftag.Value("references"); ref != "" {
m := referencesRe.FindStringSubmatch(ref)
if len(m) != 4 {
return nil, nil, fmt.Errorf("field %q has invalid references %q. Must be in the form references=Model or references=Model(Field)", v, ref)
}
if references == nil {
references = make(map[string]*reference)
}
references[v] = &reference{model: m[1], field: m[3]}
}
}
if err := o.setFieldsDefaults(fields); err != nil {
return nil, nil, err
}
return fields, references, nil
}