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145 lines
4.7 KiB
145 lines
4.7 KiB
package rpc
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import (
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"errors"
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"fmt"
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"reflect"
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)
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var errorType = reflect.TypeOf((*error)(nil)).Elem()
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func getFullName(t reflect.Type) string {
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if "" == t.PkgPath() {
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return t.Name()
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} else {
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return fmt.Sprintf("%s.%s", t.PkgPath(), t.Name())
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}
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}
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type MethodInvokerBuilder struct {
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valueParserBuilder *ValueParserBuilder
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presetTypes map[reflect.Type]valueParser
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}
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func (builder *MethodInvokerBuilder) checkOutType(parameterType reflect.Type) (bool, string) {
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switch parameterType.Kind() {
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case reflect.Invalid:
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return false, parameterType.Name()
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case reflect.Bool:
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return true, parameterType.Name()
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case reflect.Int:
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return true, parameterType.Name()
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case reflect.Int8:
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return true, parameterType.Name()
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case reflect.Int16:
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return true, parameterType.Name()
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case reflect.Int32:
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return true, parameterType.Name()
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case reflect.Int64:
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return true, parameterType.Name()
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case reflect.Uint:
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return true, parameterType.Name()
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case reflect.Uint8:
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return true, parameterType.Name()
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case reflect.Uint16:
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return true, parameterType.Name()
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case reflect.Uint32:
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return true, parameterType.Name()
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case reflect.Uint64:
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return true, parameterType.Name()
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case reflect.Uintptr:
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return false, parameterType.Name()
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case reflect.Float32:
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return true, parameterType.Name()
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case reflect.Float64:
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return true, parameterType.Name()
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case reflect.Complex64:
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return false, parameterType.Name()
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case reflect.Complex128:
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return false, parameterType.Name()
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case reflect.Array:
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if ok, typeText := builder.checkOutType(parameterType.Elem()); ok {
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return true, fmt.Sprintf("[%d]%s", parameterType.Len(), typeText)
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} else {
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return false, fmt.Sprintf("[%d]%s", parameterType.Len(), typeText)
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}
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case reflect.Chan:
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return false, parameterType.Name()
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case reflect.Func:
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return false, parameterType.Name()
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case reflect.Interface:
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return true, getFullName(parameterType)
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case reflect.Map:
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keyOk, keyTypeText := builder.checkOutType(parameterType.Key())
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valueOk, valueTypeText := builder.checkOutType(parameterType.Elem())
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if keyOk && valueOk {
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return true, fmt.Sprintf("*map[%s]%s", keyTypeText, valueTypeText)
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} else {
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return false, fmt.Sprintf("*map[%s]%s", keyTypeText, valueTypeText)
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}
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case reflect.Ptr:
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if ok, typeText := builder.checkOutType(parameterType.Elem()); ok {
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return true, fmt.Sprintf("*%s", typeText)
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} else {
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return false, fmt.Sprintf("*%s", typeText)
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}
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case reflect.Slice:
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if ok, typeText := builder.checkOutType(parameterType.Elem()); ok {
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return true, fmt.Sprintf("[]%s", typeText)
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} else {
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return false, fmt.Sprintf("[]%s", typeText)
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}
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case reflect.String:
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return true, parameterType.Name()
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case reflect.Struct:
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return true, getFullName(parameterType)
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case reflect.UnsafePointer:
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return false, parameterType.Name()
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default:
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return false, "Unknown"
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}
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}
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func (builder *MethodInvokerBuilder) buildParameterParser(serviceName string, parameterType reflect.Type, parameterIndex int) (valueParser, error) {
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if presetParameterParser, ok := builder.presetTypes[parameterType]; ok {
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return presetParameterParser, nil
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} else if parameterParser, err := builder.valueParserBuilder.Build(fmt.Sprintf("%s-in#%d", serviceName, parameterIndex), parameterType); err != nil {
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return nil, err
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} else {
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return parameterParser, nil
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}
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}
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func (builder *MethodInvokerBuilder) buildParameterParsers(serviceMethodName string, methodType reflect.Type) ([]valueParser, error) {
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if methodType.NumOut() < 1 || 2 < methodType.NumOut() {
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return nil, errors.New(fmt.Sprintf("返回值数量错误! Service: %s 返回值数量: %d", serviceMethodName, methodType.NumOut()))
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}
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if methodType.Out(methodType.NumOut()-1) != errorType {
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return nil, errors.New(fmt.Sprintf("最后一个返回值类型错误! Service: %s 类型:%s", serviceMethodName, methodType.Out(methodType.NumOut()-1)))
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}
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for i := 0; i < methodType.NumOut(); i++ {
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if ok, typeText := builder.checkOutType(methodType.Out(i)); !ok {
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return nil, errors.New(fmt.Sprintf("不支持的返回值类型! Service: %s 参数: #%d 类型: %s", serviceMethodName, i+1, typeText))
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}
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}
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parameterParsers := make([]valueParser, 0, 10)
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for i := 0; i < methodType.NumIn(); i++ {
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if parameterParser, err := builder.buildParameterParser(serviceMethodName, methodType.In(i), i); err != nil {
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return nil, err
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} else {
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parameterParsers = append(parameterParsers, parameterParser)
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}
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}
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return parameterParsers, nil
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}
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func (builder *MethodInvokerBuilder) buildMethodInvoker(serviceName string, methodType reflect.Type, call func([]reflect.Value) []reflect.Value) (*MethodInvoker, error) {
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parameterParsers, err := builder.buildParameterParsers(serviceName, methodType)
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if err != nil {
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return nil, err
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}
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return NewMethodInvoker(call, parameterParsers), nil
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}
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