request.go - dubbo-go-hessian2 - Git at Google

 // Copyright 2016-2019 Alex Stocks, Yincheng Fang
 //
 // 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 hessian

 import (
 	"encoding/binary"
 	"reflect"
 	"strconv"
 	"strings"
 	"time"
 )

 import (
 	perrors "github.com/pkg/errors"
 )

 /////////////////////////////////////////
 // dubbo
 /////////////////////////////////////////

 // com.alibaba.dubbo.common.utils.ReflectUtils.ReflectUtils.java line245 getDesc
 func getArgType(v interface{}) string {
 	if v == nil {
 		return "V"
 	}

 	switch v.(type) {
 	// Serialized tags for base types
 	case nil:
 		return "V"
 	case bool:
 		return "Z"
 	case byte:
 		return "B"
 	case int8:
 		return "B"
 	case int16:
 		return "S"
 	case uint16: // Equivalent to Char of Java
 		return "C"
 	// case rune:
 	//	return "C"
 	case int:
 		return "I"
 	case int32:
 		return "I"
 	case int64:
 		return "J"
 	case time.Time:
 		return "java.util.Date"
 	case float32:
 		return "F"
 	case float64:
 		return "D"
 	case string:
 		return "java.lang.String"
 	case []byte:
 		return "[B"
 	case map[interface{}]interface{}:
 		// return  "java.util.HashMap"
 		return "java.util.Map"

 	//  Serialized tags for complex types
 	default:
 		t := reflect.TypeOf(v)
 		if reflect.Ptr == t.Kind() {
 			t = reflect.TypeOf(reflect.ValueOf(v).Elem())
 		}
 		switch t.Kind() {
 		case reflect.Struct:
 			return "java.lang.Object"
 		case reflect.Slice, reflect.Array:
 			// return "java.util.ArrayList"
 			return "java.util.List"
 		case reflect.Map: // Enter here, map may be map[string]int
 			return "java.util.Map"
 		default:
 			return ""
 		}
 	}

 	// unreachable
 	// return "java.lang.RuntimeException"
 }

 func getArgsTypeList(args []interface{}) (string, error) {
 	var (
 		typ   string
 		types string
 	)

 	for i := range args {
 		typ = getArgType(args[i])
 		if typ == "" {
 			return types, perrors.Errorf("cat not get arg %#v type", args[i])
 		}
 		if !strings.Contains(typ, ".") {
 			types += typ
 		} else {
 			// java.util.List -> Ljava/util/List;
 			types += "L" + strings.Replace(typ, ".", "/", -1) + ";"
 		}
 	}

 	return types, nil
 }

 // dubbo-remoting/dubbo-remoting-api/src/main/java/com/alibaba/dubbo/remoting/exchange/codec/ExchangeCodec.java
 // v2.5.4 line 204 encodeRequest
 // todo: attachments
 func packRequest(service Service, header DubboHeader, params interface{}) ([]byte, error) {
 	var (
 		err           error
 		types         string
 		byteArray     []byte
 		version       string
 		pkgLen        int
 		serviceParams map[string]string
 	)

 	args, ok := params.([]interface{})
 	if !ok {
 		return nil, perrors.Errorf("@params is not of type: []interface{}")
 	}

 	hb := header.Type == PackageHeartbeat

 	//////////////////////////////////////////
 	// byteArray
 	//////////////////////////////////////////
 	// magic
 	switch header.Type {
 	case PackageHeartbeat:
 		byteArray = append(byteArray, DubboRequestHeartbeatHeader[:]...)
 	case PackageRequest_TwoWay:
 		byteArray = append(byteArray, DubboRequestHeaderBytesTwoWay[:]...)
 	default:
 		byteArray = append(byteArray, DubboRequestHeaderBytes[:]...)
 	}

 	// serialization id, two way flag, event, request/response flag
 	// SerialID is id of serialization approach in java dubbo
 	byteArray[2] |= header.SerialID & SERIAL_MASK
 	// request id
 	binary.BigEndian.PutUint64(byteArray[4:], uint64(header.ID))

 	encoder := NewEncoder()
 	encoder.Append(byteArray[:HEADER_LENGTH])

 	// com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.DubboCodec.java line144 encodeRequestData
 	//////////////////////////////////////////
 	// body
 	//////////////////////////////////////////
 	if hb {
 		encoder.Encode(nil)
 		goto END
 	}

 	// dubbo version + path + version + method
 	encoder.Encode(DUBBO_VERSION)
 	encoder.Encode(service.Target)
 	encoder.Encode(service.Version)
 	encoder.Encode(service.Method)

 	// args = args type list + args value list
 	if types, err = getArgsTypeList(args); err != nil {
 		return nil, perrors.Wrapf(err, " PackRequest(args:%+v)", args)
 	}
 	encoder.Encode(types)
 	for _, v := range args {
 		encoder.Encode(v)
 	}

 	serviceParams = make(map[string]string)
 	serviceParams[PATH_KEY] = service.Path
 	serviceParams[INTERFACE_KEY] = service.Interface
 	if len(version) != 0 {
 		serviceParams[VERSION_KEY] = version
 	}
 	if service.Timeout != 0 {
 		serviceParams[TIMEOUT_KEY] = strconv.Itoa(int(service.Timeout / time.Millisecond))
 	}

 	encoder.Encode(serviceParams)

 END:
 	byteArray = encoder.Buffer()
 	pkgLen = len(byteArray)
 	if pkgLen > int(DEFAULT_LEN) { // 8M
 		return nil, perrors.Errorf("Data length %d too large, max payload %d", pkgLen, DEFAULT_LEN)
 	}
 	// byteArray{body length}
 	binary.BigEndian.PutUint32(byteArray[12:], uint32(pkgLen-HEADER_LENGTH))
 	return byteArray, nil
 }

 // hessian decode request body
 func unpackRequestBody(buf []byte, reqObj interface{}) error {

 	req, ok := reqObj.([]interface{})
 	if !ok {
 		return perrors.Errorf("@reqObj is not of type: []interface{}")
 	}
 	if len(req) < 7 {
 		return perrors.New("length of @reqObj should  be 7")
 	}

 	var (
 		err                                                     error
 		dubboVersion, target, serviceVersion, method, argsTypes interface{}
 		args                                                    []interface{}
 	)
 	decoder := NewDecoder(buf[:])

 	dubboVersion, err = decoder.Decode()
 	if err != nil {
 		return perrors.WithStack(err)
 	}
 	req[0] = dubboVersion

 	target, err = decoder.Decode()
 	if err != nil {
 		return perrors.WithStack(err)
 	}
 	req[1] = target

 	serviceVersion, err = decoder.Decode()
 	if err != nil {
 		return perrors.WithStack(err)
 	}
 	req[2] = serviceVersion

 	method, err = decoder.Decode()
 	if err != nil {
 		return perrors.WithStack(err)
 	}
 	req[3] = method

 	argsTypes, err = decoder.Decode()
 	if err != nil {
 		return perrors.WithStack(err)
 	}
 	req[4] = argsTypes

 	ats := DescRegex.FindAllString(argsTypes.(string), -1)
 	var arg interface{}
 	for i := 0; i < len(ats); i++ {
 		arg, err = decoder.Decode()
 		if err != nil {
 			return perrors.WithStack(err)
 		}
 		args = append(args, arg)
 	}
 	req[5] = args

 	attachments, err := decoder.Decode()
 	if err != nil {
 		return perrors.WithStack(err)
 	}
 	req[6] = attachments

 	return nil
 }
	// Copyright 2016-2019 Alex Stocks, Yincheng Fang
	//
	// 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 hessian

	import (
	"encoding/binary"
	"reflect"
	"strconv"
	"strings"
	"time"
	)

	import (
	perrors "github.com/pkg/errors"
	)

	/////////////////////////////////////////
	// dubbo
	/////////////////////////////////////////

	// com.alibaba.dubbo.common.utils.ReflectUtils.ReflectUtils.java line245 getDesc
	func getArgType(v interface{}) string {
	if v == nil {
	return "V"
	}

	switch v.(type) {
	// Serialized tags for base types
	case nil:
	return "V"
	case bool:
	return "Z"
	case byte:
	return "B"
	case int8:
	return "B"
	case int16:
	return "S"
	case uint16: // Equivalent to Char of Java
	return "C"
	// case rune:
	// return "C"
	case int:
	return "I"
	case int32:
	return "I"
	case int64:
	return "J"
	case time.Time:
	return "java.util.Date"
	case float32:
	return "F"
	case float64:
	return "D"
	case string:
	return "java.lang.String"
	case []byte:
	return "[B"
	case map[interface{}]interface{}:
	// return "java.util.HashMap"
	return "java.util.Map"

	// Serialized tags for complex types
	default:
	t := reflect.TypeOf(v)
	if reflect.Ptr == t.Kind() {
	t = reflect.TypeOf(reflect.ValueOf(v).Elem())
	}
	switch t.Kind() {
	case reflect.Struct:
	return "java.lang.Object"
	case reflect.Slice, reflect.Array:
	// return "java.util.ArrayList"
	return "java.util.List"
	case reflect.Map: // Enter here, map may be map[string]int
	return "java.util.Map"
	default:
	return ""
	}
	}

	// unreachable
	// return "java.lang.RuntimeException"
	}

	func getArgsTypeList(args []interface{}) (string, error) {
	var (
	typ string
	types string
	)

	for i := range args {
	typ = getArgType(args[i])
	if typ == "" {
	return types, perrors.Errorf("cat not get arg %#v type", args[i])
	}
	if !strings.Contains(typ, ".") {
	types += typ
	} else {
	// java.util.List -> Ljava/util/List;
	types += "L" + strings.Replace(typ, ".", "/", -1) + ";"
	}
	}

	return types, nil
	}

	// dubbo-remoting/dubbo-remoting-api/src/main/java/com/alibaba/dubbo/remoting/exchange/codec/ExchangeCodec.java
	// v2.5.4 line 204 encodeRequest
	// todo: attachments
	func packRequest(service Service, header DubboHeader, params interface{}) ([]byte, error) {
	var (
	err error
	types string
	byteArray []byte
	version string
	pkgLen int
	serviceParams map[string]string
	)

	args, ok := params.([]interface{})
	if !ok {
	return nil, perrors.Errorf("@params is not of type: []interface{}")
	}

	hb := header.Type == PackageHeartbeat

	//////////////////////////////////////////
	// byteArray
	//////////////////////////////////////////
	// magic
	switch header.Type {
	case PackageHeartbeat:
	byteArray = append(byteArray, DubboRequestHeartbeatHeader[:]...)
	case PackageRequest_TwoWay:
	byteArray = append(byteArray, DubboRequestHeaderBytesTwoWay[:]...)
	default:
	byteArray = append(byteArray, DubboRequestHeaderBytes[:]...)
	}

	// serialization id, two way flag, event, request/response flag
	// SerialID is id of serialization approach in java dubbo
	byteArray[2] \|= header.SerialID & SERIAL_MASK
	// request id
	binary.BigEndian.PutUint64(byteArray[4:], uint64(header.ID))

	encoder := NewEncoder()
	encoder.Append(byteArray[:HEADER_LENGTH])

	// com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.DubboCodec.java line144 encodeRequestData
	//////////////////////////////////////////
	// body
	//////////////////////////////////////////
	if hb {
	encoder.Encode(nil)
	goto END
	}

	// dubbo version + path + version + method
	encoder.Encode(DUBBO_VERSION)
	encoder.Encode(service.Target)
	encoder.Encode(service.Version)
	encoder.Encode(service.Method)

	// args = args type list + args value list
	if types, err = getArgsTypeList(args); err != nil {
	return nil, perrors.Wrapf(err, " PackRequest(args:%+v)", args)
	}
	encoder.Encode(types)
	for _, v := range args {
	encoder.Encode(v)
	}

	serviceParams = make(map[string]string)
	serviceParams[PATH_KEY] = service.Path
	serviceParams[INTERFACE_KEY] = service.Interface
	if len(version) != 0 {
	serviceParams[VERSION_KEY] = version
	}
	if service.Timeout != 0 {
	serviceParams[TIMEOUT_KEY] = strconv.Itoa(int(service.Timeout / time.Millisecond))
	}

	encoder.Encode(serviceParams)

	END:
	byteArray = encoder.Buffer()
	pkgLen = len(byteArray)
	if pkgLen > int(DEFAULT_LEN) { // 8M
	return nil, perrors.Errorf("Data length %d too large, max payload %d", pkgLen, DEFAULT_LEN)
	}
	// byteArray{body length}
	binary.BigEndian.PutUint32(byteArray[12:], uint32(pkgLen-HEADER_LENGTH))
	return byteArray, nil
	}

	// hessian decode request body
	func unpackRequestBody(buf []byte, reqObj interface{}) error {

	req, ok := reqObj.([]interface{})
	if !ok {
	return perrors.Errorf("@reqObj is not of type: []interface{}")
	}
	if len(req) < 7 {
	return perrors.New("length of @reqObj should be 7")
	}

	var (
	err error
	dubboVersion, target, serviceVersion, method, argsTypes interface{}
	args []interface{}
	)
	decoder := NewDecoder(buf[:])

	dubboVersion, err = decoder.Decode()
	if err != nil {
	return perrors.WithStack(err)
	}
	req[0] = dubboVersion

	target, err = decoder.Decode()
	if err != nil {
	return perrors.WithStack(err)
	}
	req[1] = target

	serviceVersion, err = decoder.Decode()
	if err != nil {
	return perrors.WithStack(err)
	}
	req[2] = serviceVersion

	method, err = decoder.Decode()
	if err != nil {
	return perrors.WithStack(err)
	}
	req[3] = method

	argsTypes, err = decoder.Decode()
	if err != nil {
	return perrors.WithStack(err)
	}
	req[4] = argsTypes

	ats := DescRegex.FindAllString(argsTypes.(string), -1)
	var arg interface{}
	for i := 0; i < len(ats); i++ {
	arg, err = decoder.Decode()
	if err != nil {
	return perrors.WithStack(err)
	}
	args = append(args, arg)
	}
	req[5] = args

	attachments, err := decoder.Decode()
	if err != nil {
	return perrors.WithStack(err)
	}
	req[6] = attachments

	return nil
	}