103 lines
1.7 KiB
Go
103 lines
1.7 KiB
Go
package register
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import (
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"fmt"
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"reflect"
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"unicode"
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"unicode/utf8"
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"go.unistack.org/micro/v3/metadata"
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)
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// ExtractValue from reflect.Type from specified depth
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func ExtractValue(v reflect.Type, d int) string {
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if d == 3 {
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return ""
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}
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if v == nil {
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return ""
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}
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if v.Kind() == reflect.Ptr {
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v = v.Elem()
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}
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// slices and maps don't have a defined name
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if (v.Kind() == reflect.Slice || v.Kind() == reflect.Map) || len(v.Name()) == 0 {
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return ""
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}
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// get the rune character
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a, _ := utf8.DecodeRuneInString(string(v.Name()[0]))
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// crude check for is unexported field
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if unicode.IsLower(a) {
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return ""
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}
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return v.Name()
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}
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// ExtractEndpoint extract *Endpoint from reflect.Method
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func ExtractEndpoint(method reflect.Method) *Endpoint {
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if method.PkgPath != "" {
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return nil
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}
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var rspType, reqType reflect.Type
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var stream bool
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mt := method.Type
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switch mt.NumIn() {
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case 3:
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reqType = mt.In(1)
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rspType = mt.In(2)
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case 4:
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reqType = mt.In(2)
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rspType = mt.In(3)
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default:
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return nil
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}
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// are we dealing with a stream?
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switch rspType.Kind() {
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case reflect.Func, reflect.Interface:
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stream = true
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}
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request := ExtractValue(reqType, 0)
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response := ExtractValue(rspType, 0)
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if request == "" || response == "" {
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return nil
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}
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ep := &Endpoint{
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Name: method.Name,
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Request: request,
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Response: response,
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Metadata: metadata.New(0),
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}
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if stream {
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ep.Metadata.Set("stream", fmt.Sprintf("%v", stream))
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}
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return ep
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}
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// ExtractSubValue exctact *Value from reflect.Type
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func ExtractSubValue(typ reflect.Type) string {
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var reqType reflect.Type
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switch typ.NumIn() {
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case 1:
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reqType = typ.In(0)
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case 2:
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reqType = typ.In(1)
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case 3:
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reqType = typ.In(2)
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default:
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return ""
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}
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return ExtractValue(reqType, 0)
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}
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