RPC
RPC 框架是分布式领域核心组件,也是微服务的基础。
RPC (Remote Procedure Call)全称是远程过程调用,相对于本地方法调用,在同一内存空间可以直接通过方法栈实现调用,远程调用则跨了不同的服务终端,并不能直接调用。
RPC框架 要解决的就是远程方法调用的问题,并且实现调用远程服务像调用本地服务一样简单,框架内部封装实现了网络调用的细节。
1. 通信协议选择
根据不同的需求来选择通信协议,UDP是不可靠传输,一般来说很少做为RPC框架的选择。
TCP和HTTP是最佳选择。
HTTP虽然有很多无用的头部信息,传输效率上会比较低,但是HTTP通用性更强,跨语言,跨平台,更易移植。
TCP可靠传输,需要自定义协议,传输效率更高,但是通用性不强。
1.1 HTTP/1.0和HTTP/1.1的区别
HTTP1.0最早在网页中使用是在1996年,那个时候只是使用一些较为简单的网页上和网络请求上,而HTTP1.1则在1999年才开始广泛应用于现在的各大浏览器网络请求中,同时HTTP1.1也是当前使用最为广泛的HTTP协议。 主要区别主要体现在:
- 缓存处理,在HTTP1.0中主要使用header里的If-Modified-Since,Expires来做为缓存判断的标准,HTTP1.1则引入了更多的缓存控制策略例如Entity tag,If-Unmodified-Since, If-Match, If-None-Match等更多可供选择的缓存头来控制缓存策略。
- 带宽优化及网络连接的使用,HTTP1.0中,存在一些浪费带宽的现象,例如客户端只是需要某个对象的一部分,而服务器却将整个对象送过来了,并且不支持断点续传功能,HTTP1.1则在请求头引入了range头域,它允许只请求资源的某个部分,即返回码是206(Partial Content),这样就方便了开发者自由的选择以便于充分利用带宽和连接。
- 错误通知的管理,在HTTP1.1中新增了24个错误状态响应码,如409(Conflict)表示请求的资源与资源的当前状态发生冲突;410(Gone)表示服务器上的某个资源被永久性的删除。
- Host头处理,在HTTP1.0中认为每台服务器都绑定一个唯一的IP地址,因此,请求消息中的URL并没有传递主机名(hostname)。但随着虚拟主机技术的发展,在一台物理服务器上可以存在多个虚拟主机(Multi-homed Web Servers),并且它们共享一个IP地址。HTTP1.1的请求消息和响应消息都应支持Host头域,且请求消息中如果没有Host头域会报告一个错误(400 Bad Request)。
- 长连接,HTTP 1.1支持长连接(PersistentConnection)和请求的流水线(Pipelining)处理,在一个TCP连接上可以传送多个HTTP请求和响应,减少了建立和关闭连接的消耗和延迟,在HTTP1.1中默认开启Connection: keep-alive,一定程度上弥补了HTTP1.0每次请求都要创建连接的缺点。
1.2 HTTP/1.1和HTTP/2的区别
- 新的二进制格式(Binary Format),HTTP1.x的解析是基于文本。基于文本协议的格式解析存在天然缺陷,文本的表现形式有多样性,要做到健壮性考虑的场景必然很多,二进制则不同,只认0和1的组合。基于这种考虑HTTP2.0的协议解析决定采用二进制格式,实现方便且健壮。
- 多路复用(MultiPlexing),即连接共享,即每一个request都是是用作连接共享机制的。一个request对应一个id,这样一个连接上可以有多个request,每个连接的request可以随机的混杂在一起,接收方可以根据request的 id将request再归属到各自不同的服务端请求里面。
- header压缩,如上文中所言,对前面提到过HTTP1.x的header带有大量信息,而且每次都要重复发送,HTTP2.0使用encoder来减少需要传输的header大小,通讯双方各自cache一份header fields表,既避免了重复header的传输,又减小了需要传输的大小。
- 服务端推送(server push)HTTP2.0也具有server push功能。
grpc采用了http2协议,由于http的通用性,所以现在的几乎所有的rpc框架都支持grpc
2. 序列化协议
数据在网络中传输,必须是二进制的,所以我们需要先将传输的对象进行序列化之后,才能传输。
接收方通过反序列化将数据解析出来。
序列化协议有XML、 JSON、Protobuf、Thrift 等,Golang 原生支持的 Gob 协议。
3. 编解码
如果使用TCP,我们需要定义数据传输的格式,防止在传输过程中出现的粘包,拆包等问题。
假设客户端分别发送了两个数据包D1和D2给服务端,由于服务端一次读取到字节数是不确定的,故可能存在以下四种情况:
- 服务端分两次读取到了两个独立的数据包,分别是D1和D2,没有粘包和拆包
- 服务端一次接受到了两个数据包,D1和D2粘合在一起,称之为
TCP粘包
- 服务端分两次读取到了数据包,第一次读取到了完整的D1包和D2包的部分内容,第二次读取到了D2包的剩余内容,这称之为
TCP拆包
- 服务端分两次读取到了数据包,第一次读取到了D1包的部分内容D1_1,第二次读取到了D1包的剩余部分内容D1_2和完整的D2包。
特别要注意的是,如果TCP的接受滑窗
非常小,而数据包D1和D2比较大,很有可能会发生第五种情况,即服务端分多次才能将D1和D2包完全接收,期间发生多次拆包
。
自定义格式可以使用定长的头和不定长的体,标识数据长度即可
。
1字节 | 1字节 | 4字节 | 1字节 | 1字节 | 1字节 | 8字节 | 不定 |
---|---|---|---|---|---|---|---|
魔法数(Magic Number) | 版本(Version) | 消息长度(full length) | 消息类型(messageType) | 压缩类型(compress) | 序列化类型(serialize) | 请求id(requestId) | 请求体(body) |
- magic number : 通信双方协商的一个暗号 魔数的作用是用于服务端在接收数据时先解析出魔数做正确性对比。如果和协议中的魔数不匹配,则认为是非法数据
- version : 不同版本的协议对应的解析方法可能是不同的,应对业务变化需求
- full length: 记录了整个消息的长度
- messageType:普通请求、普通响应、心跳等,根据消息类型做出不同的解析
- compress: 序列化的字节流,还可以进行压缩,使得体积更小,在网络传输更快,不一定要使用
- serialize:序列化方式,比如json,protostuff,glob等
- request id:每个请求分配好请求Id,这样响应数据的时候,才能对的上
- body:具体的数据
4. 实现
4.1 http方式
package rpc
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"time"
)
type MsHttpClient struct {
client http.Client
}
// NewHttpClient Transport请求分发,协程安全,支持连接池s
func NewHttpClient() *MsHttpClient {
client := http.Client{
Timeout: time.Duration(3) * time.Second,
Transport: &http.Transport{
MaxIdleConnsPerHost: 5,
MaxConnsPerHost: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
},
}
return &MsHttpClient{client: client}
}
func (c *MsHttpClient) GetRequest(method string, url string, args map[string]any) (*http.Request, error) {
if args != nil && len(args) > 0 {
url = url + "?" + c.toValues(args)
}
req, err := http.NewRequest(method, url, nil)
if err != nil {
return nil, err
}
return req, nil
}
func (c *MsHttpClient) FormRequest(method string, url string, args map[string]any) (*http.Request, error) {
req, err := http.NewRequest(method, url, strings.NewReader(c.toValues(args)))
if err != nil {
return nil, err
}
return req, nil
}
func (c *MsHttpClient) JsonRequest(method string, url string, args map[string]any) (*http.Request, error) {
jsonStr, _ := json.Marshal(args)
req, err := http.NewRequest(method, url, bytes.NewReader(jsonStr))
if err != nil {
return nil, err
}
return req, nil
}
func (c *MsHttpClient) Get(url string, args map[string]any) ([]byte, error) {
if args != nil && len(args) > 0 {
url = url + "?" + c.toValues(args)
}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
return c.handleResponse(req)
}
func (c *MsHttpClient) PostForm(url string, args map[string]any) ([]byte, error) {
req, err := http.NewRequest("POST", url, strings.NewReader(c.toValues(args)))
if err != nil {
return nil, err
}
return c.handleResponse(req)
}
func (c *MsHttpClient) PostJson(url string, args map[string]any) ([]byte, error) {
jsonStr, _ := json.Marshal(args)
req, err := http.NewRequest("POST", url, bytes.NewReader(jsonStr))
if err != nil {
return nil, err
}
return c.handleResponse(req)
}
func (c *MsHttpClient) Response(req *http.Request) ([]byte, error) {
return c.handleResponse(req)
}
func (c *MsHttpClient) handleResponse(req *http.Request) ([]byte, error) {
var err error
response, err := c.client.Do(req)
if err != nil {
return nil, err
}
if response.StatusCode != 200 {
return nil, errors.New(response.Status)
}
buffLen := 79
buff := make([]byte, buffLen)
body := make([]byte, 0)
reader := bufio.NewReader(response.Body)
for {
n, err := reader.Read(buff)
if err == io.EOF || n == 0 {
break
}
body = append(body, buff[:n]...)
if n < buffLen {
break
}
}
defer response.Body.Close()
if err != nil {
return nil, err
}
return body, nil
}
func (c *MsHttpClient) toValues(args map[string]any) string {
if args != nil && len(args) > 0 {
params := url.Values{}
for k, v := range args {
params.Set(k, fmt.Sprintf("%v", v))
}
return params.Encode()
}
return ""
}
ordercenter:
package main
import (
"encoding/json"
"fmt"
"github.com/mszlu521/msgo"
"github.com/mszlu521/msgo/rpc"
"net/http"
)
type Result struct {
Code int `json:"code"`
Msg string `json:"msg"`
Data any `json:"data"`
}
type Goods struct {
Id int64 `json:"id"`
Name string `json:"name"`
}
func main() {
engine := msgo.Default()
client := rpc.NewHttpClient()
g := engine.Group("order")
g.Get("/find", func(ctx *msgo.Context) {
//查询商品
bytes, err := client.Get("http://localhost:9002/goods/find", nil)
if err != nil {
ctx.Logger.Error(err)
}
fmt.Println(string(bytes))
v := &Result{}
json.Unmarshal(bytes, v)
ctx.JSON(http.StatusOK, v)
})
engine.Run(":9003")
}
goodsCenter:
package main
import (
"github.com/mszlu521/msgo"
"net/http"
)
type Result struct {
Code int `json:"code"`
Msg string `json:"msg"`
Data any `json:"data"`
}
type Goods struct {
Id int64 `json:"id"`
Name string `json:"name"`
}
func main() {
engine := msgo.Default()
g := engine.Group("goods")
g.Get("/find", func(ctx *msgo.Context) {
//查询商品
goods := Goods{Id: 1000, Name: "商品中心9001商品"}
ctx.JSON(http.StatusOK, &Result{Code: 200, Msg: "success", Data: goods})
})
engine.Run(":9002")
}
4.2 改造http方式
config:
package rpc
import "strconv"
type Config struct {
Protocol string
Host string
Port int
Ssl bool
}
func (c Config) Url() string {
switch c.Protocol {
case HTTP, HTTP2:
prefix := "http://"
if c.Ssl {
prefix = "https://"
}
return prefix + c.Host + ":" + strconv.FormatInt(int64(c.Port), 10)
}
return ""
}
const (
HTTP = "HTTP"
HTTP2 = "HTTP2"
TCP = "TCP"
)
const (
GET = "GET"
POSTForm = "POST_FORM"
POSTJson = "POST_JSON"
)
rpc.go:
package rpc
type MsService interface {
Env() Config
}
func (c *MsHttpClient) Use(name string, s MsService) {
if c.serviceMap == nil {
c.serviceMap = make(map[string]MsService)
}
c.serviceMap[name] = s
}
func (c *MsHttpClient) Do(name string, method string) MsService {
s, ok := c.serviceMap[name]
if !ok {
panic(errors.New(name + " not exist, please action"))
}
t := reflect.TypeOf(s)
v := reflect.ValueOf(s)
if t.Kind() != reflect.Pointer {
panic(errors.New("service must be pointer"))
}
tVar := t.Elem()
vVar := v.Elem()
findIndex := -1
for i := 0; i < tVar.NumField(); i++ {
field := tVar.Field(i)
name := field.Name
if method == name {
findIndex = i
}
}
if findIndex == -1 {
panic(errors.New(method + " not exist"))
}
requestPath := tVar.Field(findIndex).Tag.Get("msrpc")
if requestPath == "" {
panic(errors.New("msrpc tag not exist"))
}
split := strings.Split(requestPath, ",")
mt := split[0]
path := split[1]
co := s.Env()
prefix := co.Url()
f := func(args map[string]any) ([]byte, error) {
if mt == GET {
return c.Get(prefix+path, args)
}
if mt == POSTForm {
return c.PostForm(prefix+path, args)
}
if mt == POSTJson {
return c.PostJson(prefix+path, args)
}
return nil, nil
}
value := reflect.ValueOf(f)
vVar.Field(findIndex).Set(value)
return s
}
goods:
package service
import (
"github.com/mszlu521/msgo/rpc"
)
type Goods struct {
Id int64 `json:"id"`
Name string `json:"name"`
}
type GoodsService struct {
Find func(args map[string]any) ([]byte, error) `msrpc:"GET,/goods/find"`
}
func (r *GoodsService) Env() rpc.Config {
c := rpc.Config{
Host: "localhost",
Port: 9002,
Protocol: rpc.HTTP,
}
return c
}
package main
import (
"encoding/json"
"fmt"
"github.com/mszlu521/msgo"
"github.com/mszlu521/msgo/rpc"
"github.com/mszlu521/ordercenter/model"
"github.com/mszlu521/ordercenter/service"
"net/http"
)
func main() {
engine := msgo.Default()
client := rpc.NewHttpClient()
g := engine.Group("order")
goodsService := &service.GoodsService{}
client.Use("goodsService", goodsService)
g.Get("/find", func(ctx *msgo.Context) {
//查询商品
v := &model.Result{}
bytes, err := client.Do("goodsService", "Find").(*service.GoodsService).Find(nil)
if err != nil {
ctx.Logger.Error(err)
}
fmt.Println(string(bytes))
json.Unmarshal(bytes, v)
ctx.JSON(http.StatusOK, v)
})
engine.Run(":9003")
}
通过上述改造,我们可以比较轻易的使用框架,来实现http方式的rpc调用
记住:框架的目的是易用,但同时需要遵守规则,所以定义规则也是框架的一部分
4.3 http2(grpc)方式
有关grpc的使用可以先去看教程,教程地址
go get google.golang.org/grpc
protoc --go_out=./ --go-grpc_out=./ .\api\goods.proto
goodscenter服务端:
syntax = "proto3";
//import "google/protobuf/any.proto";
option go_package="/api";
package api;
service GoodsApi {
rpc Find(GoodsRequest) returns (GoodsResponse);
}
message GoodsRequest {
}
message GoodsResponse {
int64 Code = 1;
string Msg = 2;
Goods Data = 3;
}
message Goods {
int64 Id = 1;
string Name = 2;
}
package service
import (
"context"
"github.com/mszlu521/goodscenter/api"
)
type GoodsApiService struct {
}
func (GoodsApiService) Find(context.Context, *api.GoodsRequest) (*api.GoodsResponse, error) {
goods := &api.Goods{Id: 1000, Name: "商品中心9002商品,grpc提供"}
res := &api.GoodsResponse{
Code: 200,
Msg: "success",
Data: goods,
}
return res, nil
}
func (GoodsApiService) mustEmbedUnimplementedGoodsApiServer() {}
grpc服务端:
listen, _ := net.Listen("tcp", ":9111")
server := grpc.NewServer()
api.RegisterGoodsApiServer(server, &api.GoodsApiService{})
err := server.Serve(listen)
log.Println(err)
grpc客户端:
g.Get("/findGrpc", func(ctx *msgo.Context) {
//查询商品
var serviceHost = "127.0.0.1:9111"
conn, err := grpc.Dial(serviceHost, grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
fmt.Println(err)
}
defer conn.Close()
client := api.NewGoodsApiClient(conn)
rsp, err := client.Find(context.TODO(), &api.GoodsRequest{})
if err != nil {
fmt.Println(err)
}
ctx.JSON(http.StatusOK, rsp)
})
4.3.1 形成框架工具
服务端:
package rpc
import (
"google.golang.org/grpc"
"net"
)
type MsGrpcServer struct {
listen net.Listener
grpcServer *grpc.Server
registers []func(grpcServer *grpc.Server)
ops []grpc.ServerOption
}
func NewGrpcServer(address string, ops ...MsGrpcOption) (*MsGrpcServer, error) {
listen, err := net.Listen("tcp", address)
if err != nil {
return nil, err
}
ms := &MsGrpcServer{
listen: listen,
}
for _, op := range ops {
op.Apply(ms)
}
s := grpc.NewServer(ms.ops...)
ms.grpcServer = s
return ms, nil
}
func (s *MsGrpcServer) Run() error {
for _, register := range s.registers {
register(s.grpcServer)
}
return s.grpcServer.Serve(s.listen)
}
func (s *MsGrpcServer) Register(register func(grpServer *grpc.Server)) {
s.registers = append(s.registers, register)
}
type MsGrpcOption interface {
Apply(s *MsGrpcServer)
}
type DefaultGrpcOption struct {
f func(s *MsGrpcServer)
}
func (d DefaultGrpcOption) Apply(s *MsGrpcServer) {
d.f(s)
}
func WithGrpcOptions(options ...grpc.ServerOption) MsGrpcOption {
return DefaultGrpcOption{f: func(s *MsGrpcServer) {
s.ops = append(s.ops, options...)
}}
}
grpcServer, _ := rpc.NewGrpcServer(":9111")
grpcServer.Register(func(grpServer *grpc.Server) {
api.RegisterGoodsApiServer(grpServer, &api.GoodsApiService{})
})
err := grpcServer.Run()
type MsGrpcClient struct {
Conn *grpc.ClientConn
}
func NewGrpcClient(config *MsGrpcClientConfig) (*MsGrpcClient, error) {
var ctx = context.Background()
var dialOptions = config.dialOptions
if config.Block {
//阻塞
if config.DialTimeout > time.Duration(0) {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, config.DialTimeout)
defer cancel()
}
dialOptions = append(dialOptions, grpc.WithBlock())
}
if config.KeepAlive != nil {
dialOptions = append(dialOptions, grpc.WithKeepaliveParams(*config.KeepAlive))
}
conn, err := grpc.DialContext(ctx, config.Address, dialOptions...)
if err != nil {
return nil, err
}
return &MsGrpcClient{
Conn: conn,
}, nil
}
type MsGrpcClientConfig struct {
Address string
Block bool
DialTimeout time.Duration
ReadTimeout time.Duration
Direct bool
KeepAlive *keepalive.ClientParameters
dialOptions []grpc.DialOption
}
func DefaultGrpcClientConfig() *MsGrpcClientConfig {
return &MsGrpcClientConfig{
dialOptions: []grpc.DialOption{
grpc.WithTransportCredentials(insecure.NewCredentials()),
},
DialTimeout: time.Second * 3,
ReadTimeout: time.Second * 2,
Block: true,
}
}
4.4 TCP方式
tcp方式就需要实现序列化,编解码等操作了
序列化协议支持两种:
Protobuf 和 go的Gob协议。
4.4.1 server端
type Serializer interface {
Serialize(i interface{}) ([]byte, error)
Deserialize(data []byte, i interface{}) error
}
type GobSerializer struct{}
func (c GobSerializer) Serialize(data any) ([]byte, error) {
var buffer bytes.Buffer
encoder := gob.NewEncoder(&buffer)
if err := encoder.Encode(data); err != nil {
return nil, err
}
return buffer.Bytes(), nil
}
func (c GobSerializer) Deserialize(data []byte, target any) error {
buffer := bytes.NewBuffer(data)
decoder := gob.NewDecoder(buffer)
return decoder.Decode(target)
}
type MsRpcMessage struct {
//头
Header *Header
//消息体
Data any
}
const mn byte = 0x1d
const version = 0x01
type CompressType byte
const (
Gzip CompressType = iota
)
type SerializeType byte
const (
Gob SerializeType = iota
ProtoBuff
)
type MessageType byte
const (
msgRequest MessageType = iota
msgResponse
msgPing
msgPong
)
type Header struct {
MagicNumber byte
Version byte
FullLength int32
MessageType MessageType
CompressType CompressType
SerializeType SerializeType
RequestId int64
}
type MsRpcRequest struct {
RequestId int64
ServiceName string
MethodName string
Args []any
}
type MsRpcResponse struct {
RequestId int64
Code int16
Msg string
CompressType CompressType
SerializeType SerializeType
Data any
}
type MsRpcServer interface {
Register(name string, service interface{})
Run()
Stop()
}
type MsTcpServer struct {
listener net.Listener
Host string
Port int
Network string
serviceMap map[string]interface{}
}
type MsTcpConn struct {
s *MsTcpServer
conn net.Conn
rspChan chan *MsRpcResponse
}
func (c *MsTcpConn) writeHandle() {
ctx := context.Background()
_, cancel := context.WithTimeout(ctx, time.Duration(3)*time.Second)
defer cancel()
select {
case rsp := <-c.rspChan:
//编码数据
err := c.Send(c.conn, rsp)
if err != nil {
log.Println(err)
}
return
case <-ctx.Done():
log.Println("超时了")
return
}
}
func (c *MsTcpConn) Send(conn net.Conn, rsp *MsRpcResponse) error {
headers := make([]byte, 17)
//magic number
headers[0] = mn
//version
headers[1] = version
//full length
//消息类型
headers[6] = byte(msgResponse)
//压缩类型
headers[7] = byte(rsp.CompressType)
//序列化
headers[8] = byte(rsp.SerializeType)
//请求id
binary.BigEndian.PutUint64(headers[9:], uint64(rsp.RequestId))
serializer, err := loadSerialize(rsp.SerializeType)
if err != nil {
return err
}
body, err := serializer.Serialize(rsp)
if err != nil {
return err
}
body, err = compress(body, rsp.CompressType)
if err != nil {
return err
}
fullLen := 17 + len(body)
binary.BigEndian.PutUint32(headers[2:6], uint32(fullLen))
_, err = conn.Write(headers[:])
if err != nil {
return err
}
err = binary.Write(c.conn, binary.BigEndian, body[:])
if err != nil {
return err
}
log.Println("发送数据成功")
return nil
}
func NewTcpServer(host string, port int) *MsTcpServer {
return &MsTcpServer{
Host: host,
Port: port,
Network: "tcp",
}
}
func (s *MsTcpServer) Register(name string, service interface{}) {
if s.serviceMap == nil {
s.serviceMap = make(map[string]interface{})
}
v := reflect.ValueOf(service)
if v.Kind() != reflect.Pointer {
panic(errors.New("service not pointer"))
}
s.serviceMap[name] = service
}
func (s *MsTcpServer) Run() {
addr := fmt.Sprintf("%s:%d", s.Host, s.Port)
listen, err := net.Listen(s.Network, addr)
if err != nil {
panic(err)
}
s.listener = listen
for {
conn, err := s.listener.Accept()
if err != nil {
log.Println(err)
continue
}
msConn := &MsTcpConn{conn: conn, rspChan: make(chan *MsRpcResponse, 1), s: s}
go s.readHandle(msConn)
go msConn.writeHandle()
}
}
func (s *MsTcpServer) readHandle(msConn *MsTcpConn) {
defer func() {
if err := recover(); err != nil {
log.Println(err)
msConn.conn.Close()
}
}()
msg := s.decodeFrame(msConn.conn)
if msg == nil {
msConn.rspChan <- nil
return
}
//根据请求
if msg.Header.MessageType == msgRequest {
req := msg.Data.(*MsRpcRequest)
//查找注册的服务匹配后进行调用,调用完发送到一个channel当中
service, ok := s.serviceMap[req.ServiceName]
rsp := &MsRpcResponse{RequestId: req.RequestId, CompressType: msg.Header.CompressType, SerializeType: msg.Header.SerializeType}
if !ok {
rsp.Code = 500
rsp.Msg = "no service found"
msConn.rspChan <- rsp
return
}
v := reflect.ValueOf(service)
reflectMethod := v.MethodByName(req.MethodName)
args := make([]reflect.Value, len(req.Args))
for i := range req.Args {
args[i] = reflect.ValueOf(req.Args[i])
}
result := reflectMethod.Call(args)
if len(result) == 0 {
//无返回结果
rsp.Code = 200
msConn.rspChan <- rsp
return
}
resArgs := make([]interface{}, len(result))
for i := 0; i < len(result); i++ {
resArgs[i] = result[i].Interface()
}
var err error
if _, ok := result[len(result)-1].Interface().(error); ok {
err = result[len(result)-1].Interface().(error)
}
if err != nil {
rsp.Code = 500
rsp.Msg = err.Error()
}
rsp.Code = 200
rsp.Data = resArgs[0]
msConn.rspChan <- rsp
log.Println("接收数据成功")
return
}
}
func (s *MsTcpServer) Close() {
if s.listener != nil {
s.listener.Close()
}
}
func (*MsTcpServer) decodeFrame(conn net.Conn) *MsRpcMessage {
//读取数据 先读取header部分
//1+1+4+1+1+1+8 = 17字节
headers := make([]byte, 17)
_, err := io.ReadFull(conn, headers)
if err != nil {
log.Println(err)
return nil
}
//magic number
magicNumber := headers[0]
if magicNumber != mn {
log.Println("magic number not valid : ", magicNumber)
return nil
}
//version
version := headers[1]
//
fullLength := headers[2:6]
//
mt := headers[6]
messageType := MessageType(mt)
//压缩类型
compressType := headers[7]
//序列化类型
serializeType := headers[8]
//请求id
requestId := headers[9:]
//将body解析出来,包装成request 根据请求内容查找对应的服务,完成调用
//网络调用 大端
fl := int32(binary.BigEndian.Uint32(fullLength))
bodyLen := fl - 17
body := make([]byte, bodyLen)
_, err = io.ReadFull(conn, body)
log.Println("读完了")
if err != nil {
log.Println(err)
return nil
}
//先解压
body, err = unCompress(body, CompressType(compressType))
if err != nil {
log.Println(err)
return nil
}
//反序列化
serializer, err := loadSerialize(SerializeType(serializeType))
if err != nil {
log.Println(err)
return nil
}
header := &Header{}
header.MagicNumber = magicNumber
header.FullLength = fl
header.CompressType = CompressType(compressType)
header.Version = version
header.SerializeType = SerializeType(serializeType)
header.RequestId = int64(binary.BigEndian.Uint64(requestId))
header.MessageType = messageType
if messageType == msgRequest {
msg := &MsRpcMessage{}
msg.Header = header
req := &MsRpcRequest{}
err := serializer.Deserialize(body, req)
if err != nil {
log.Println(err)
return nil
}
msg.Data = req
return msg
}
if messageType == msgResponse {
msg := &MsRpcMessage{}
msg.Header = header
rsp := &MsRpcResponse{}
err := serializer.Deserialize(body, rsp)
if err != nil {
log.Println(err)
return nil
}
msg.Data = rsp
return msg
}
return nil
}
func loadSerialize(serializeType SerializeType) (Serializer, error) {
switch serializeType {
case Gob:
//gob
s := &GobSerializer{}
return s, nil
}
return nil, errors.New("no serializeType")
}
func compress(body []byte, compressType CompressType) ([]byte, error) {
switch compressType {
case Gzip:
//return body, nil
//gzip
//创建一个新的 byte 输出流
var buf bytes.Buffer
w := gzip.NewWriter(&buf)
_, err := w.Write(body)
if err != nil {
return nil, err
}
if err := w.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
return nil, errors.New("no compressType")
}
func unCompress(body []byte, compressType CompressType) ([]byte, error) {
switch compressType {
case Gzip:
//return body, nil
//gzip
reader, err := gzip.NewReader(bytes.NewReader(body))
defer reader.Close()
if err != nil {
return nil, err
}
buf := new(bytes.Buffer)
// 从 Reader 中读取出数据
if _, err := buf.ReadFrom(reader); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
return nil, errors.New("no compressType")
}
tcpServer := rpc.NewTcpServer("localhost", 9112)
gob.Register(&model.Result{})
gob.Register(&model.Goods{})
tcpServer.Register("goods", &service.GoodsRpcService{})
go tcpServer.Run()
go engine.Run(":9002")
quit := make(chan os.Signal)
signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT)
<-quit
tcpServer.Close()
package service
import (
"github.com/mszlu521/goodscenter/model"
)
type GoodsRpcService struct {
}
func (*GoodsRpcService) Find(id int64) *model.Result {
goods := model.Goods{Id: 1000, Name: "商品中心9002商品"}
return &model.Result{Code: 200, Msg: "success", Data: goods}
}
4.4.2 client端
type MsRpcClient interface {
Connect() error
Invoke(context context.Context, serviceName string, methodName string, args []any) (any, error)
Close() error
}
type MsTcpClient struct {
conn net.Conn
option TcpClientOption
}
type TcpClientOption struct {
Retries int
ConnectionTimeout time.Duration
SerializeType SerializeType
CompressType CompressType
Host string
Port int
}
var DefaultOption = TcpClientOption{
Host: "127.0.0.1",
Port: 9112,
Retries: 3,
ConnectionTimeout: 5 * time.Second,
SerializeType: Gob,
CompressType: Gzip,
}
func NewTcpClient(option TcpClientOption) *MsTcpClient {
return &MsTcpClient{option: option}
}
func (c *MsTcpClient) Connect() error {
addr := fmt.Sprintf("%s:%d", c.option.Host, c.option.Port)
conn, err := net.DialTimeout("tcp", addr, c.option.ConnectionTimeout)
if err != nil {
return err
}
c.conn = conn
return nil
}
var reqId int64
func (c *MsTcpClient) Invoke(ctx context.Context, serviceName string, methodName string, args []any) (any, error) {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, c.option.ConnectionTimeout)
defer cancel()
req := &MsRpcRequest{}
req.RequestId = atomic.AddInt64(&reqId, 1)
req.ServiceName = serviceName
req.MethodName = methodName
req.args = args
headers := make([]byte, 17)
//magic number
headers[0] = mn
//version
headers[1] = version
//full length
//消息类型
headers[6] = byte(msgRequest)
//压缩类型
headers[7] = byte(c.option.CompressType)
//序列化
headers[8] = byte(c.option.SerializeType)
//请求id
binary.BigEndian.PutUint64(headers[9:], uint64(req.RequestId))
serializer, err := loadSerialize(c.option.SerializeType)
if err != nil {
return nil, err
}
body, err := serializer.Serialize(req)
if err != nil {
return nil, err
}
body, err = compress(body, c.option.CompressType)
if err != nil {
return nil, err
}
fullLen := 17 + len(body)
binary.BigEndian.PutUint32(headers[2:6], uint32(fullLen))
_, err = c.conn.Write(headers[:])
if err != nil {
return nil, err
}
err = binary.Write(c.conn, binary.BigEndian, body[:])
if err != nil {
return nil, err
}
rspChan := make(chan *MsRpcResponse)
go c.readHandle(rspChan)
rsp := <-rspChan
return rsp, nil
}
func (c *MsTcpClient) Close() error {
if c.conn != nil {
return c.conn.Close()
}
return nil
}
func (c *MsTcpClient) readHandle(rspChan chan *MsRpcResponse) {
defer func() {
if err := recover(); err != nil {
log.Println(err)
c.conn.Close()
}
}()
for {
msg := c.decodeFrame(c.conn)
if msg == nil {
log.Println("未解析出任何数据")
rspChan <- nil
return
}
//根据请求
if msg.Header.MessageType == msgResponse {
rsp := msg.Data.(*MsRpcResponse)
rspChan <- rsp
return
}
}
}
func (*MsTcpClient) decodeFrame(conn net.Conn) *MsRpcMessage {
//读取数据 先读取header部分
//1+1+4+1+1+1+8 = 17字节
headers := make([]byte, 17)
_, err := io.ReadFull(conn, headers)
if err != nil {
log.Println(err)
return nil
}
//magic number
magicNumber := headers[0]
if magicNumber != mn {
log.Println("magic number not valid : ", magicNumber)
return nil
}
//version
version := headers[1]
//
fullLength := headers[2:6]
//
mt := headers[6]
messageType := MessageType(mt)
//压缩类型
compressType := headers[7]
//序列化类型
serializeType := headers[8]
//请求id
requestId := headers[9:]
//将body解析出来,包装成request 根据请求内容查找对应的服务,完成调用
//网络调用 大端
fl := int32(binary.BigEndian.Uint32(fullLength))
bodyLen := fl - 17
body := make([]byte, bodyLen)
_, err = io.ReadFull(conn, body)
log.Println("读完了")
if err != nil {
log.Println(err)
return nil
}
//先解压
body, err = unCompress(body, CompressType(compressType))
if err != nil {
log.Println(err)
return nil
}
//反序列化
serializer, err := loadSerialize(SerializeType(serializeType))
if err != nil {
log.Println(err)
return nil
}
header := &Header{}
header.MagicNumber = magicNumber
header.FullLength = fl
header.CompressType = CompressType(compressType)
header.Version = version
header.SerializeType = SerializeType(serializeType)
header.RequestId = int64(binary.BigEndian.Uint64(requestId))
header.MessageType = messageType
if messageType == msgRequest {
msg := &MsRpcMessage{}
msg.Header = header
req := &MsRpcRequest{}
err := serializer.Deserialize(body, req)
if err != nil {
log.Println(err)
return nil
}
msg.Data = req
return msg
}
if messageType == msgResponse {
msg := &MsRpcMessage{}
msg.Header = header
rsp := &MsRpcResponse{}
err := serializer.Deserialize(body, rsp)
if err != nil {
log.Println(err)
return nil
}
msg.Data = rsp
return msg
}
return nil
}
type MsTcpClientProxy struct {
client *MsTcpClient
option TcpClientOption
}
func NewMsTcpClientProxy(option TcpClientOption) *MsTcpClientProxy {
return &MsTcpClientProxy{option: option}
}
func (p *MsTcpClientProxy) Call(ctx context.Context, serviceName string, methodName string, args []any) (any, error) {
client := NewTcpClient(p.option)
p.client = client
err := client.Connect()
if err != nil {
return nil, err
}
for i := 0; i < p.option.Retries; i++ {
result, err := client.Invoke(ctx, serviceName, methodName, args)
if err != nil {
if i >= p.option.Retries-1 {
log.Println(errors.New("already retry all time"))
client.Close()
return nil, err
}
continue
}
client.Close()
return result, nil
}
return nil, errors.New("retry time is 0")
}
g.Get("/findTcp", func(ctx *msgo.Context) {
//查询商品
gob.Register(&model.Result{})
gob.Register(&model.Goods{})
args := make([]any, 1)
args[0] = 1
result, err := proxy.Call(context.Background(), "goods", "Find", args)
if err != nil {
panic(err)
}
ctx.JSON(http.StatusOK, result)
})
4.4.3 protobuf序列化支持
type ProtobufSerializer struct{}
func (c ProtobufSerializer) Serialize(data any) ([]byte, error) {
marshal, err := proto.Marshal(data.(proto.Message))
if err != nil {
return nil, err
}
return marshal, nil
}
func (c ProtobufSerializer) Deserialize(data []byte, target any) error {
message := target.(proto.Message)
return proto.Unmarshal(data, message)
}
protoc --go_out=./ --go-grpc_out=./ .\rpc\tcp.proto
syntax = "proto3";
import "google/protobuf/struct.proto";
option go_package="/rpc";
package rpc;
message Request {
int64 RequestId = 1;
string ServiceName = 2;
string MethodName = 3;
repeated google.protobuf.Value Args = 4;
}
message Response {
int64 RequestId = 1;
int32 Code = 2;
string Msg = 3;
int32 CompressType = 4;
int32 SerializeType = 5;
google.protobuf.Value Data = 6;
}
package rpc
import (
"bytes"
"compress/gzip"
"context"
"encoding/binary"
"encoding/gob"
"encoding/json"
"errors"
"fmt"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/structpb"
"io"
"log"
"net"
"reflect"
"sync/atomic"
"time"
)
type Serializer interface {
Serialize(i interface{}) ([]byte, error)
Deserialize(data []byte, i interface{}) error
}
type GobSerializer struct{}
func (c GobSerializer) Serialize(data any) ([]byte, error) {
var buffer bytes.Buffer
encoder := gob.NewEncoder(&buffer)
if err := encoder.Encode(data); err != nil {
return nil, err
}
return buffer.Bytes(), nil
}
func (c GobSerializer) Deserialize(data []byte, target any) error {
buffer := bytes.NewBuffer(data)
decoder := gob.NewDecoder(buffer)
return decoder.Decode(target)
}
type ProtobufSerializer struct{}
func (c ProtobufSerializer) Serialize(data any) ([]byte, error) {
marshal, err := proto.Marshal(data.(proto.Message))
if err != nil {
return nil, err
}
return marshal, nil
}
func (c ProtobufSerializer) Deserialize(data []byte, target any) error {
message := target.(proto.Message)
return proto.Unmarshal(data, message)
}
type MsRpcMessage struct {
//头
Header *Header
//消息体
Data any
}
const mn byte = 0x1d
const version = 0x01
type CompressType byte
const (
Gzip CompressType = iota
)
type SerializeType byte
const (
Gob SerializeType = iota
ProtoBuff
)
type MessageType byte
const (
msgRequest MessageType = iota
msgResponse
msgPing
msgPong
)
type Header struct {
MagicNumber byte
Version byte
FullLength int32
MessageType MessageType
CompressType CompressType
SerializeType SerializeType
RequestId int64
}
type MsRpcRequest struct {
RequestId int64
ServiceName string
MethodName string
Args []any
}
type MsRpcResponse struct {
RequestId int64
Code int16
Msg string
CompressType CompressType
SerializeType SerializeType
Data any
}
type MsRpcServer interface {
Register(name string, service interface{})
Run()
Stop()
}
type MsTcpServer struct {
listener net.Listener
Host string
Port int
Network string
serviceMap map[string]interface{}
}
type MsTcpConn struct {
s *MsTcpServer
conn net.Conn
rspChan chan *MsRpcResponse
}
func (c *MsTcpConn) writeHandle() {
ctx := context.Background()
_, cancel := context.WithTimeout(ctx, time.Duration(3)*time.Second)
defer cancel()
select {
case rsp := <-c.rspChan:
//编码数据
err := c.Send(c.conn, rsp)
if err != nil {
log.Println(err)
}
return
case <-ctx.Done():
log.Println("超时了")
return
}
}
func (c *MsTcpConn) Send(conn net.Conn, rsp *MsRpcResponse) error {
headers := make([]byte, 17)
//magic number
headers[0] = mn
//version
headers[1] = version
//full length
//消息类型
headers[6] = byte(msgResponse)
//压缩类型
headers[7] = byte(rsp.CompressType)
//序列化
headers[8] = byte(rsp.SerializeType)
//请求id
binary.BigEndian.PutUint64(headers[9:], uint64(rsp.RequestId))
serializer, err := loadSerialize(SerializeType(rsp.SerializeType))
if err != nil {
return err
}
var body []byte
if ProtoBuff == rsp.SerializeType {
pRsp := &Response{}
pRsp.SerializeType = int32(rsp.SerializeType)
pRsp.CompressType = int32(rsp.CompressType)
pRsp.Code = int32(rsp.Code)
pRsp.Msg = rsp.Msg
pRsp.RequestId = rsp.RequestId
//value, err := structpb.
// log.Println(err)
m := make(map[string]any)
marshal, _ := json.Marshal(rsp.Data)
_ = json.Unmarshal(marshal, &m)
value, err := structpb.NewStruct(m)
log.Println(err)
pRsp.Data = structpb.NewStructValue(value)
body, err = serializer.Serialize(pRsp)
} else {
body, err = serializer.Serialize(rsp)
}
if err != nil {
return err
}
body, err = compress(body, CompressType(rsp.CompressType))
if err != nil {
return err
}
fullLen := 17 + len(body)
binary.BigEndian.PutUint32(headers[2:6], uint32(fullLen))
_, err = conn.Write(headers[:])
if err != nil {
return err
}
err = binary.Write(c.conn, binary.BigEndian, body[:])
if err != nil {
return err
}
log.Println("发送数据成功")
return nil
}
func NewTcpServer(host string, port int) *MsTcpServer {
return &MsTcpServer{
Host: host,
Port: port,
Network: "tcp",
}
}
func (s *MsTcpServer) Register(name string, service interface{}) {
if s.serviceMap == nil {
s.serviceMap = make(map[string]interface{})
}
v := reflect.ValueOf(service)
if v.Kind() != reflect.Pointer {
panic(errors.New("service not pointer"))
}
s.serviceMap[name] = service
}
func (s *MsTcpServer) Run() {
addr := fmt.Sprintf("%s:%d", s.Host, s.Port)
listen, err := net.Listen(s.Network, addr)
if err != nil {
panic(err)
}
s.listener = listen
for {
conn, err := s.listener.Accept()
if err != nil {
log.Println(err)
continue
}
msConn := &MsTcpConn{conn: conn, rspChan: make(chan *MsRpcResponse, 1), s: s}
go s.readHandle(msConn)
go msConn.writeHandle()
}
}
func (s *MsTcpServer) readHandle(msConn *MsTcpConn) {
defer func() {
if err := recover(); err != nil {
log.Println(err)
msConn.conn.Close()
}
}()
msg := s.decodeFrame(msConn.conn)
if msg == nil {
msConn.rspChan <- nil
return
}
//根据请求
if msg.Header.MessageType == msgRequest {
req := msg.Data.(*Request)
//查找注册的服务匹配后进行调用,调用完发送到一个channel当中
service, ok := s.serviceMap[req.ServiceName]
rsp := &MsRpcResponse{RequestId: req.RequestId, CompressType: msg.Header.CompressType, SerializeType: msg.Header.SerializeType}
if !ok {
rsp.Code = 500
rsp.Msg = "no service found"
msConn.rspChan <- rsp
return
}
v := reflect.ValueOf(service)
reflectMethod := v.MethodByName(req.MethodName)
args := make([]reflect.Value, len(req.Args))
for i := range req.Args {
of := reflect.ValueOf(req.Args[i].AsInterface())
of = of.Convert(reflectMethod.Type().In(i))
args[i] = of
}
result := reflectMethod.Call(args)
if len(result) == 0 {
//无返回结果
rsp.Code = 200
msConn.rspChan <- rsp
return
}
resArgs := make([]interface{}, len(result))
for i := 0; i < len(result); i++ {
resArgs[i] = result[i].Interface()
}
var err error
if _, ok := result[len(result)-1].Interface().(error); ok {
err = result[len(result)-1].Interface().(error)
}
if err != nil {
rsp.Code = 500
rsp.Msg = err.Error()
}
rsp.Code = 200
rsp.Data = resArgs[0]
msConn.rspChan <- rsp
log.Println("接收数据成功")
return
}
}
func (s *MsTcpServer) Close() {
if s.listener != nil {
s.listener.Close()
}
}
func (*MsTcpServer) decodeFrame(conn net.Conn) *MsRpcMessage {
//读取数据 先读取header部分
//1+1+4+1+1+1+8 = 17字节
headers := make([]byte, 17)
_, err := io.ReadFull(conn, headers)
if err != nil {
log.Println(err)
return nil
}
//magic number
magicNumber := headers[0]
if magicNumber != mn {
log.Println("magic number not valid : ", magicNumber)
return nil
}
//version
version := headers[1]
//
fullLength := headers[2:6]
//
mt := headers[6]
messageType := MessageType(mt)
//压缩类型
compressType := headers[7]
//序列化类型
serializeType := headers[8]
//请求id
requestId := headers[9:]
//将body解析出来,包装成request 根据请求内容查找对应的服务,完成调用
//网络调用 大端
fl := int32(binary.BigEndian.Uint32(fullLength))
bodyLen := fl - 17
body := make([]byte, bodyLen)
_, err = io.ReadFull(conn, body)
log.Println("读完了")
if err != nil {
log.Println(err)
return nil
}
//先解压
body, err = unCompress(body, CompressType(compressType))
if err != nil {
log.Println(err)
return nil
}
//反序列化
serializer, err := loadSerialize(SerializeType(serializeType))
if err != nil {
log.Println(err)
return nil
}
header := &Header{}
header.MagicNumber = magicNumber
header.FullLength = fl
header.CompressType = CompressType(compressType)
header.Version = version
header.SerializeType = SerializeType(serializeType)
header.RequestId = int64(binary.BigEndian.Uint64(requestId))
header.MessageType = messageType
if messageType == msgRequest {
msg := &MsRpcMessage{}
msg.Header = header
if ProtoBuff == SerializeType(serializeType) {
req := &Request{}
err := serializer.Deserialize(body, req)
if err != nil {
log.Println(err)
return nil
}
msg.Data = req
} else {
req := &MsRpcRequest{}
err := serializer.Deserialize(body, req)
if err != nil {
log.Println(err)
return nil
}
msg.Data = req
}
return msg
}
if messageType == msgResponse {
msg := &MsRpcMessage{}
msg.Header = header
if ProtoBuff == SerializeType(serializeType) {
rsp := &Response{}
err := serializer.Deserialize(body, rsp)
if err != nil {
log.Println(err)
return nil
}
msg.Data = rsp
} else {
rsp := &MsRpcResponse{}
err := serializer.Deserialize(body, rsp)
if err != nil {
log.Println(err)
return nil
}
msg.Data = rsp
}
return msg
}
return nil
}
func loadSerialize(serializeType SerializeType) (Serializer, error) {
switch serializeType {
case Gob:
//gob
s := &GobSerializer{}
return s, nil
case ProtoBuff:
s := &ProtobufSerializer{}
return s, nil
}
return nil, errors.New("no serializeType")
}
func compress(body []byte, compressType CompressType) ([]byte, error) {
switch compressType {
case Gzip:
//return body, nil
//gzip
//创建一个新的 byte 输出流
var buf bytes.Buffer
w := gzip.NewWriter(&buf)
_, err := w.Write(body)
if err != nil {
return nil, err
}
if err := w.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
return nil, errors.New("no compressType")
}
func unCompress(body []byte, compressType CompressType) ([]byte, error) {
switch compressType {
case Gzip:
//return body, nil
//gzip
reader, err := gzip.NewReader(bytes.NewReader(body))
defer reader.Close()
if err != nil {
return nil, err
}
buf := new(bytes.Buffer)
// 从 Reader 中读取出数据
if _, err := buf.ReadFrom(reader); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
return nil, errors.New("no compressType")
}
type MsRpcClient interface {
Connect() error
Invoke(context context.Context, serviceName string, methodName string, args []any) (any, error)
Close() error
}
type MsTcpClient struct {
conn net.Conn
option TcpClientOption
}
type TcpClientOption struct {
Retries int
ConnectionTimeout time.Duration
SerializeType SerializeType
CompressType CompressType
Host string
Port int
}
var DefaultOption = TcpClientOption{
Host: "127.0.0.1",
Port: 9112,
Retries: 3,
ConnectionTimeout: 5 * time.Second,
SerializeType: Gob,
CompressType: Gzip,
}
func NewTcpClient(option TcpClientOption) *MsTcpClient {
return &MsTcpClient{option: option}
}
func (c *MsTcpClient) Connect() error {
addr := fmt.Sprintf("%s:%d", c.option.Host, c.option.Port)
conn, err := net.DialTimeout("tcp", addr, c.option.ConnectionTimeout)
if err != nil {
return err
}
c.conn = conn
return nil
}
var reqId int64
func (c *MsTcpClient) Invoke(ctx context.Context, serviceName string, methodName string, args []any) (any, error) {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, c.option.ConnectionTimeout)
defer cancel()
req := &MsRpcRequest{}
req.RequestId = atomic.AddInt64(&reqId, 1)
req.ServiceName = serviceName
req.MethodName = methodName
req.Args = args
headers := make([]byte, 17)
//magic number
headers[0] = mn
//version
headers[1] = version
//full length
//消息类型
headers[6] = byte(msgRequest)
//压缩类型
headers[7] = byte(c.option.CompressType)
//序列化
headers[8] = byte(c.option.SerializeType)
//请求id
binary.BigEndian.PutUint64(headers[9:], uint64(req.RequestId))
serializer, err := loadSerialize(c.option.SerializeType)
if err != nil {
return nil, err
}
var body []byte
if ProtoBuff == c.option.SerializeType {
pReq := &Request{}
pReq.RequestId = atomic.AddInt64(&reqId, 1)
pReq.ServiceName = serviceName
pReq.MethodName = methodName
list, err := structpb.NewList(args)
log.Println(err)
pReq.Args = list.Values
body, err = serializer.Serialize(pReq)
} else {
body, err = serializer.Serialize(req)
}
fmt.Println(body)
if err != nil {
return nil, err
}
log.Println(body)
body, err = compress(body, c.option.CompressType)
if err != nil {
return nil, err
}
fullLen := 17 + len(body)
binary.BigEndian.PutUint32(headers[2:6], uint32(fullLen))
_, err = c.conn.Write(headers[:])
if err != nil {
return nil, err
}
log.Println(body)
log.Println("len:", len(body))
err = binary.Write(c.conn, binary.BigEndian, body[:])
if err != nil {
return nil, err
}
rspChan := make(chan *MsRpcResponse)
go c.readHandle(rspChan)
rsp := <-rspChan
return rsp, nil
}
func (c *MsTcpClient) Close() error {
if c.conn != nil {
return c.conn.Close()
}
return nil
}
func (c *MsTcpClient) readHandle(rspChan chan *MsRpcResponse) {
defer func() {
if err := recover(); err != nil {
log.Println(err)
c.conn.Close()
}
}()
for {
msg := c.decodeFrame(c.conn)
if msg == nil {
log.Println("未解析出任何数据")
rspChan <- nil
return
}
//根据请求
if msg.Header.MessageType == msgResponse {
if msg.Header.SerializeType == ProtoBuff {
rsp := msg.Data.(*Response)
asInterface := rsp.Data.AsInterface()
marshal, _ := json.Marshal(asInterface)
rsp1 := &MsRpcResponse{}
json.Unmarshal(marshal, rsp1)
rspChan <- rsp1
} else {
rsp := msg.Data.(*MsRpcResponse)
rspChan <- rsp
}
return
}
}
}
func (*MsTcpClient) decodeFrame(conn net.Conn) *MsRpcMessage {
//读取数据 先读取header部分
//1+1+4+1+1+1+8 = 17字节
headers := make([]byte, 17)
_, err := io.ReadFull(conn, headers)
if err != nil {
log.Println(err)
return nil
}
//magic number
magicNumber := headers[0]
if magicNumber != mn {
log.Println("magic number not valid : ", magicNumber)
return nil
}
//version
version := headers[1]
//
fullLength := headers[2:6]
//
mt := headers[6]
messageType := MessageType(mt)
//压缩类型
compressType := headers[7]
//序列化类型
serializeType := headers[8]
//请求id
requestId := headers[9:]
//将body解析出来,包装成request 根据请求内容查找对应的服务,完成调用
//网络调用 大端
fl := int32(binary.BigEndian.Uint32(fullLength))
bodyLen := fl - 17
body := make([]byte, bodyLen)
_, err = io.ReadFull(conn, body)
log.Println("读完了")
if err != nil {
log.Println(err)
return nil
}
//先解压
body, err = unCompress(body, CompressType(compressType))
if err != nil {
log.Println(err)
return nil
}
//反序列化
serializer, err := loadSerialize(SerializeType(serializeType))
if err != nil {
log.Println(err)
return nil
}
header := &Header{}
header.MagicNumber = magicNumber
header.FullLength = fl
header.CompressType = CompressType(compressType)
header.Version = version
header.SerializeType = SerializeType(serializeType)
header.RequestId = int64(binary.BigEndian.Uint64(requestId))
header.MessageType = messageType
if messageType == msgRequest {
msg := &MsRpcMessage{}
msg.Header = header
if ProtoBuff == SerializeType(serializeType) {
req := &Request{}
err := serializer.Deserialize(body, req)
if err != nil {
log.Println(err)
return nil
}
msg.Data = req
} else {
req := &MsRpcRequest{}
err := serializer.Deserialize(body, req)
if err != nil {
log.Println(err)
return nil
}
msg.Data = req
}
return msg
}
if messageType == msgResponse {
msg := &MsRpcMessage{}
msg.Header = header
if ProtoBuff == SerializeType(serializeType) {
rsp := &Response{}
err := serializer.Deserialize(body, rsp)
if err != nil {
log.Println(err)
return nil
}
msg.Data = rsp
} else {
rsp := &MsRpcResponse{}
err := serializer.Deserialize(body, rsp)
if err != nil {
log.Println(err)
return nil
}
msg.Data = rsp
}
return msg
}
return nil
}
type MsTcpClientProxy struct {
client *MsTcpClient
option TcpClientOption
}
func NewMsTcpClientProxy(option TcpClientOption) *MsTcpClientProxy {
return &MsTcpClientProxy{option: option}
}
func (p *MsTcpClientProxy) Call(ctx context.Context, serviceName string, methodName string, args []any) (any, error) {
client := NewTcpClient(p.option)
p.client = client
err := client.Connect()
if err != nil {
return nil, err
}
for i := 0; i < p.option.Retries; i++ {
result, err := client.Invoke(ctx, serviceName, methodName, args)
if err != nil {
if i >= p.option.Retries-1 {
log.Println(errors.New("already retry all time"))
client.Close()
return nil, err
}
continue
}
client.Close()
return result, nil
}
return nil, errors.New("retry time is 0")
}
对rpc做了初步实现,属于简单实现,并没有处理更为复杂的心跳,超时,连接管理等,需要大家自行去完善