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Provide ability to have nested config structs (#37)
Signed-off-by: Alex Demin <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "reflect" | ||
| ) | ||
|
|
||
| type structFieldType uint | ||
|
|
||
| const ( | ||
| typeInvalid structFieldType = iota | ||
| typeField | ||
| typeStruct | ||
| ) | ||
|
|
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| type parser struct { | ||
| dups map[Source]string | ||
| } | ||
|
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| func newParser() *parser { | ||
| return &parser{} | ||
| } | ||
|
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| func (p *parser) ParseCfg(cfg interface{}) ([]*Field, error) { | ||
| p.dups = make(map[Source]string) | ||
|
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| tp := reflect.TypeOf(cfg) | ||
| if tp.Kind() != reflect.Ptr { | ||
| return nil, errors.New("configuration should be a pointer type") | ||
| } | ||
|
|
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| return p.getFields("", tp.Elem(), reflect.ValueOf(cfg).Elem()) | ||
| } | ||
|
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| func (p *parser) getFields(prefix string, tp reflect.Type, val reflect.Value) ([]*Field, error) { | ||
| var ff []*Field | ||
|
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| for i := 0; i < tp.NumField(); i++ { | ||
| f := tp.Field(i) | ||
|
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| typ, err := p.getStructFieldType(f) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| switch typ { | ||
| case typeField: | ||
| fld, err := p.createField(prefix, f, val.Field(i)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| ff = append(ff, fld) | ||
| case typeStruct: | ||
| nested, err := p.getFields(prefix+f.Name, f.Type, val.Field(i)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| ff = append(ff, nested...) | ||
| } | ||
| } | ||
| return ff, nil | ||
| } | ||
|
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| func (p *parser) createField(prefix string, f reflect.StructField, val reflect.Value) (*Field, error) { | ||
| fld := newField(prefix, f, val) | ||
|
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| value, ok := fld.Sources()[SourceConsul] | ||
| if ok { | ||
| if p.isKeyValueDuplicate(SourceConsul, value) { | ||
| return nil, fmt.Errorf("duplicate value %v for source %s", fld, SourceConsul) | ||
| } | ||
| } | ||
|
|
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| return fld, nil | ||
| } | ||
|
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| func (p *parser) isKeyValueDuplicate(src Source, value string) bool { | ||
| v, ok := p.dups[src] | ||
| if ok { | ||
| if value == v { | ||
| return true | ||
| } | ||
| } | ||
| p.dups[src] = value | ||
| return false | ||
| } | ||
|
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| func (p *parser) getStructFieldType(f reflect.StructField) (structFieldType, error) { | ||
| t := f.Type | ||
| if t.Kind() != reflect.Struct { | ||
| return typeInvalid, fmt.Errorf("only struct type supported for %s", f.Name) | ||
| } | ||
|
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||
| for _, tag := range sourceTags { | ||
| if _, ok := f.Tag.Lookup(string(tag)); ok { | ||
| if t.PkgPath() != "github.com/beatlabs/harvester/sync" { | ||
| return typeInvalid, fmt.Errorf("field %s is not supported (only types from the sync package of harvester)", f.Name) | ||
| } | ||
| return typeField, nil | ||
| } | ||
| } | ||
|
|
||
| return typeStruct, nil | ||
| } |
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