Ftr: Add dubbo-go-cli telnet tool support

tools/cli/.gitignore

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+.idea/
+
+# Binary
+example/dubbo-go-cli
+

tools/cli/README.md

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+# dubbo-go-cli
+
+### 1. Problem we solved.
+
+For the running dubbo-go server, we need a telnet-cli tool to test if the server works healthily.
+The tool should support dubbo protocol, making it easy for you to define your own request pkg, get rsp struct of your server, and total costing time. 
+
+
+### 2. How to get cli-tool
+run in dubbo-go/tools/cli \
+`$ sh build.sh`\
+and you can get dubbo-go-cli 
+
+### 3. Quick start：[example](example/README_CN.md)
+
+
+
+### Third party dependence（temporary）
+
+github.com/LaurenceLiZhixin/dubbo-go-hessian2 \
+github.com/LaurenceLiZhixin/json-interface-parser 

tools/cli/README_CN.md

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+# dubbo-go-cli
+
+### 1. 解决问题
+
+针对正在运行的dubbo服务，需要拥有一个命令行工具来针对服务进行测试。
+该服务需要支持dubbo协议，方便用户进行自定义传输包体。
+
+### 2. cli工具获取方法
+`sh build.sh`
+
+### 3. 使用方法：见[example](example/README_CN.md)
+
+
+### 第三方依赖（临时兼容）
+
+github.com/LaurenceLiZhixin/dubbo-go-hessian2 \
+github.com/LaurenceLiZhixin/json-interface-parser 

tools/cli/build.sh

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+export GOPROXY="http://goproxy.io"
+go build -o dubbo-go-cli

tools/cli/client/client.go

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 client
+
+import (
+	"log"
+	"net"
+	"strconv"
+	"sync"
+	"time"
+)
+
+import (
+	"go.uber.org/atomic"
+)
+
+import (
+	"github.com/apache/dubbo-go/tools/cli/common"
+	"github.com/apache/dubbo-go/tools/cli/protocol"
+	_ "github.com/apache/dubbo-go/tools/cli/protocol/dubbo"
+)
+
+const defaultBufferSize = 1024 * 1024 * 4
+
+// TelnetClient maintain a connection to target
+type TelnetClient struct {
+	tcpAddr         string
+	responseTimeout time.Duration
+	protocolName    string
+	requestList     []*protocol.Request
+	conn            *net.TCPConn
+	proto           protocol.Protocol
+
+	sequence         atomic.Uint64
+	pendingResponses *sync.Map
+	waitNum          atomic.Uint64
+}
+
+// NewTelnetClient create a new tcp connection, and create default request
+func NewTelnetClient(host string, port int, protocolName, interfaceID, version, group, method string, reqPkg interface{}, timeout int) (*TelnetClient, error) {
+	tcpAddr := net.JoinHostPort(host, strconv.Itoa(port))
+	resolved := resolveTCPAddr(tcpAddr)
+	conn, err := net.DialTCP("tcp", nil, resolved)
+	if err != nil {
+		return nil, err
+	}
+	log.Printf("connected to %s:%d\n", host, port)
+	log.Printf("try calling interface:%s.%s\n", interfaceID, method)
+	log.Printf("with protocol:%s\n\n", protocolName)
+	proto := common.GetProtocol(protocolName)
+
+	return &TelnetClient{
+		tcpAddr:          tcpAddr,
+		conn:             conn,
+		responseTimeout:  time.Duration(timeout) * time.Millisecond, //default timeout
+		protocolName:     protocolName,
+		pendingResponses: &sync.Map{},
+		proto:            proto,
+		requestList: []*protocol.Request{
+			{
+				InterfaceID: interfaceID,
+				Version:     version,
+				Method:      method,
+				Group:       group,
+				Params:      []interface{}{reqPkg},
+			},
+		},
+	}, nil
+}
+
+func resolveTCPAddr(addr string) *net.TCPAddr {
+	resolved, error := net.ResolveTCPAddr("tcp", addr)
+	if nil != error {
+		log.Fatalf("Error occured while resolving TCP address \"%v\": %v\n", addr, error)
+	}
+
+	return resolved
+}
+
+// ProcessRequests send all requests
+func (t *TelnetClient) ProcessRequests(userPkg interface{}) {
+	for i, _ := range t.requestList {
+		t.processSingleRequest(t.requestList[i], userPkg)
+	}
+}
+
+// addPendingResponse add a response @model to pending queue
+// once the rsp got, the model will be used.
+func (t *TelnetClient) addPendingResponse(model interface{}) uint64 {
+	seqId := t.sequence.Load()
+	t.pendingResponses.Store(seqId, model)
+	t.waitNum.Inc()
+	t.sequence.Inc()
+	return seqId
+}
+
+// removePendingResponse delete item from pending queue by @seq
+func (t *TelnetClient) removePendingResponse(seq uint64) {
+	if t.pendingResponses == nil {
+		return
+	}
+	if _, ok := t.pendingResponses.Load(seq); ok {
+		t.pendingResponses.Delete(seq)
+		t.waitNum.Dec()
+	}
+	return
+}
+
+// processSingleRequest call one req.
+func (t *TelnetClient) processSingleRequest(req *protocol.Request, userPkg interface{}) {
+	// proto create package procedure
+	req.ID = t.sequence.Load()
+	inputData, err := t.proto.Write(req)
+	if err != nil {
+		log.Fatalln("error: handler.Writer err = ", err)
+	}
+	startTime := time.Now()
+
+	// init rsp Package and add to pending queue
+	seqId := t.addPendingResponse(userPkg)
+	defer t.removePendingResponse(seqId)
+
+	requestDataChannel := make(chan []byte, 0)
+	responseDataChannel := make(chan []byte, 0)
+
+	// start data transfer procedure
+	go t.readInputData(string(inputData), requestDataChannel)
+	go t.readServerData(t.conn, responseDataChannel)
+
+	timeAfter := time.After(t.responseTimeout)
+
+	for {
+		select {
+		case <-timeAfter:
+			log.Println("request timeout to:", t.tcpAddr)
+			return
+		case request := <-requestDataChannel:
+			if _, err := t.conn.Write(request); nil != err {
+				log.Fatalf("Error occured while writing to TCP socket: %v\n", err)
+			}
+		case response := <-responseDataChannel:
+			rspPkg, _, err := t.proto.Read(response, t.pendingResponses)
+			if err != nil {
+				log.Fatalln("Error with protocol Read(): ", err)
+			}
+			t.removePendingResponse(seqId)
+			log.Printf("After %dms , Got Rsp:", time.Now().Sub(startTime).Milliseconds())
+			common.PrintInterface(rspPkg)
+			if t.waitNum.Sub(0) == 0 {
+				return
+			}
+		}
+	}
+}
+
+func (t *TelnetClient) readInputData(inputData string, toSent chan<- []byte) {
+	toSent <- []byte(inputData)
+}
+
+func (t *TelnetClient) readServerData(connection *net.TCPConn, received chan<- []byte) {
+	buffer := make([]byte, defaultBufferSize)
+	var err error
+	var n int
+	for nil == err {
+		n, err = connection.Read(buffer)
+		received <- buffer[:n]
+	}
+
+	t.assertEOF(err)
+}
+
+func (t *TelnetClient) assertEOF(error error) {
+	if "EOF" != error.Error() {
+		log.Fatalf("Error occured while operating on TCP socket: %v\n", error)
+	}
+}
+
+// Destroy close the tcp conn
+func (t *TelnetClient) Destroy() {
+	t.conn.Close()
+}

tools/cli/common/protocol.go

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 common
+
+import (
+	"github.com/apache/dubbo-go/tools/cli/protocol"
+)
+
+var (
+	protocols = make(map[string]func() protocol.Protocol, 8)
+)
+
+// SetProtocol sets the protocol extension with @name
+func SetProtocol(name string, v func() protocol.Protocol) {
+	protocols[name] = v
+}
+
+// GetProtocol finds the protocol extension with @name
+func GetProtocol(name string) protocol.Protocol {
+	if protocols[name] == nil {
+		panic("protocol for " + name + " is not existing, make sure you have import the package.")
+	}
+	return protocols[name]()
+}

tools/cli/common/tool.go

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 common
+
+import (
+	"fmt"
+	"log"
+	"reflect"
+)
+
+// PrintInterface print the interface by level
+func PrintInterface(v interface{}) {
+	val := reflect.ValueOf(v).Elem()
+	typ := reflect.TypeOf(v)
+	log.Printf("%+v\n", v)
+	nums := val.NumField()
+	for i := 0; i < nums; i++ {
+		if typ.Elem().Field(i).Type.Kind() == reflect.Ptr {
+			log.Printf("%s: ", typ.Elem().Field(i).Name)
+			PrintInterface(val.Field(i).Interface())
+		}
+	}
+	fmt.Println("")
+}