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service_func_meta.go
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/
service_func_meta.go
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// Copyright 2017-2020 The Usacloud Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tools
import (
"log"
"reflect"
)
type ServiceFuncMeta struct {
HasRequestValue bool
HasReturnValue bool
IsReturnValueSlice bool
}
func (c *Command) ServiceFuncReturnValueType() *ServiceFuncMeta {
svcType := c.Resource.ServiceType
method, ok := svcType.MethodByName(c.ServiceFuncName())
if !ok {
log.Fatalf(
"reading meta info of service func failed: service-type: %s func-name: %s error: not found",
svcType.Name(), c.ServiceFuncName())
}
hasRequest := false
numIn := method.Type.NumIn()
if numIn > 2 { // [0]はレシーバー、[1]はctx
hasRequest = true
}
numOut := method.Type.NumOut()
if numOut < 2 { // 戻り値なし(ないはず) or errorのみの場合
return &ServiceFuncMeta{HasRequestValue: hasRequest, HasReturnValue: false, IsReturnValueSlice: false}
}
firstReturnValue := method.Type.Out(0)
if firstReturnValue.Kind() == reflect.Slice {
return &ServiceFuncMeta{HasRequestValue: hasRequest, HasReturnValue: true, IsReturnValueSlice: true}
}
return &ServiceFuncMeta{HasRequestValue: hasRequest, HasReturnValue: true, IsReturnValueSlice: false}
}