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method.go
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method.go
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// Copyright (c) nano Authors. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package component
import (
"reflect"
"unicode"
"unicode/utf8"
"github.com/lonng/nano/session"
)
var (
typeOfError = reflect.TypeOf((*error)(nil)).Elem()
typeOfBytes = reflect.TypeOf(([]byte)(nil))
typeOfSession = reflect.TypeOf(session.New(nil))
)
func isExported(name string) bool {
w, _ := utf8.DecodeRuneInString(name)
return unicode.IsUpper(w)
}
func isExportedOrBuiltinType(t reflect.Type) bool {
for t.Kind() == reflect.Ptr {
t = t.Elem()
}
// PkgPath will be non-empty even for an exported type,
// so we need to check the type name as well.
return isExported(t.Name()) || t.PkgPath() == ""
}
// isHandlerMethod decide a method is suitable handler method
func isHandlerMethod(method reflect.Method) bool {
mt := method.Type
// Method must be exported.
if method.PkgPath != "" {
return false
}
// Method needs three ins: receiver, *Session, []byte or pointer.
if mt.NumIn() != 3 {
return false
}
// Method needs one outs: error
if mt.NumOut() != 1 {
return false
}
if t1 := mt.In(1); t1.Kind() != reflect.Ptr || t1 != typeOfSession {
return false
}
if (mt.In(2).Kind() != reflect.Ptr && mt.In(2) != typeOfBytes) || mt.Out(0) != typeOfError {
return false
}
return true
}