/
rpc_client.go
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/
rpc_client.go
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/**
* Copyright 2018 gd Author. All Rights Reserved.
* Author: Chuck1024
*/
package dogrpc
import (
"crypto/tls"
"crypto/x509"
dogError "github.com/chuck1024/gd/derror"
"github.com/chuck1024/gd/dlog"
"github.com/chuck1024/gd/utls/network"
"io"
"io/ioutil"
"math/rand"
"net"
"sync"
"time"
)
/*
* default rpc client
*/
type RpcClient struct {
Cm map[string]*Client
cmMutex sync.Mutex
addrs []*net.TCPAddr
Timeout time.Duration
RetryNum uint32
localIp string
TlsCfg *tls.Config
RpcCaPemFile string
RpcClientKeyFile string
RpcClientPemFile string
}
func NewClient(timeout time.Duration, retryNum uint32, useTls bool, cfg *tls.Config, ca, serverKey, serverPem string) *RpcClient {
r := &RpcClient{
Cm: make(map[string]*Client),
Timeout: timeout,
RetryNum: retryNum,
localIp: network.GetLocalIP(),
TlsCfg: cfg,
RpcCaPemFile: ca,
RpcClientKeyFile: serverKey,
RpcClientPemFile: serverPem,
}
if useTls && r.TlsCfg == nil {
if r.RpcCaPemFile == "" {
r.RpcCaPemFile = "conf/ca.pem"
}
if r.RpcClientKeyFile == "" {
r.RpcClientKeyFile = "conf/client.key"
}
if r.RpcClientPemFile == "" {
r.RpcClientPemFile = "conf/client.pem"
}
cert, err := tls.LoadX509KeyPair(r.RpcClientPemFile, r.RpcClientKeyFile)
if err != nil {
return nil
}
certPool := x509.NewCertPool()
ca, err := ioutil.ReadFile(r.RpcCaPemFile)
if err != nil {
return nil
}
if !certPool.AppendCertsFromPEM(ca) {
return nil
}
r.TlsCfg = &tls.Config{
RootCAs: certPool,
Certificates: []tls.Certificate{cert},
InsecureSkipVerify: true,
}
}
return r
}
// add server address
func (c *RpcClient) AddAddr(addr string) *RpcClient {
if addr2, err := net.ResolveTCPAddr("tcp", addr); err != nil {
dlog.Error("parse addr failed, %s", err.Error())
} else {
c.addrs = append(c.addrs, addr2)
}
return c
}
// Stop stop client
func (c *RpcClient) Stop() {
for addr, cc := range c.Cm {
cc.Stop()
dlog.Error("dog rpc client stop client %s", addr)
}
dlog.Info("dog rpc client stop all done.")
}
// connect
func (c *RpcClient) Connect() (*Client, error) {
addr := &net.TCPAddr{}
if len(c.addrs) > 0 {
rand.Seed(time.Now().UnixNano())
idx := rand.Intn(len(c.addrs))
addr = c.addrs[idx]
} else {
return nil, InternalServerError
}
cc, ok := c.Cm[addr.String()]
if !ok {
c.cmMutex.Lock()
defer c.cmMutex.Unlock()
if cc, ok = c.Cm[addr.String()]; !ok {
cc = &Client{
Addr: addr.String(),
RequestTimeout: c.Timeout,
}
if c.TlsCfg != nil {
cc.Dial = func(addr string) (conn io.ReadWriteCloser, err error) {
c, err := tls.DialWithDialer(dialer, DefaultDialNetWork, addr, c.TlsCfg)
if err != nil {
return nil, err
}
return c, err
}
}
cc.Start()
c.Cm[addr.String()] = cc
} else {
dlog.Warn("[Connect] Addr %s already created.", addr)
}
} else {
if cc.clientStopChan == nil {
cc.Start()
}
}
return cc, nil
}
// Invoke rpc call
func (c *RpcClient) Invoke(cmd uint32, req []byte, client ...*Client) (code uint32, rsp []byte, err *dogError.CodeError) {
var ct *Client
if len(client) == 0 {
cc, err := c.Connect()
if err != nil {
dlog.Error("[Invoke] connect occur error:%s", err)
return code, nil, InternalServerError
}
ct = cc
} else {
ct = client[0]
}
var reqPkt, rspPkt Packet
reqPkt = NewRpcPacket(cmd, req)
if rspPkt, err = ct.CallRetry(reqPkt, c.RetryNum); err != nil {
dlog.Error("[Invoke] CallRetry occur error:%v ", err)
return code, nil, err
}
rsp = rspPkt.(*RpcPacket).Body
code = rspPkt.(*RpcPacket).ErrCode
return code, rsp, nil
}