support multipe msggateway services in k8s deployments (#1565)

* feature:support multi msggateway

* feature:support multi msggateway

---------

Co-authored-by: lin.huang <lin.huang@apulis.com>

pkg/common/discoveryregister/discoveryregister.go

@@ -4,6 +4,9 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"os"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/OpenIMSDK/tools/discoveryregistry"
@@ -43,7 +46,12 @@ func NewK8sDiscoveryRegister() (discoveryregistry.SvcDiscoveryRegistry, error) {
 }
 
 func (cli *K8sDR) Register(serviceName, host string, port int, opts ...grpc.DialOption) error {
+	if serviceName != config.Config.RpcRegisterName.OpenImMessageGatewayName {
 		cli.rpcRegisterAddr = serviceName
+	} else {
+		cli.rpcRegisterAddr = cli.getSelfHost(context.Background())
+	}
+
 	return nil
 }
 func (cli *K8sDR) UnRegister() error {
@@ -63,10 +71,68 @@ func (cli *K8sDR) GetConfFromRegistry(key string) ([]byte, error) {
 
 	return nil, nil
 }
+func (cli *K8sDR) getSelfHost(ctx context.Context) string {
+	port := 88
+	instance := "openimserver"
+	selfPodName := os.Getenv("MY_POD_NAME")
+	ns := os.Getenv("MY_POD_NAMESPACE")
+	statefuleIndex := 0
+	gatewayEnds := strings.Split(config.Config.RpcRegisterName.OpenImMessageGatewayName, ":")
+	if len(gatewayEnds) != 2 {
+		log.ZError(ctx, "msggateway RpcRegisterName is error:config.Config.RpcRegisterName.OpenImMessageGatewayName", errors.New("config error"))
+	} else {
+		port, _ = strconv.Atoi(gatewayEnds[1])
+	}
+	podInfo := strings.Split(selfPodName, "-")
+	instance = podInfo[0]
+	count := len(podInfo)
+	statefuleIndex, _ = strconv.Atoi(podInfo[count-1])
+	host := fmt.Sprintf("%s-openim-msggateway-%d.%s-openim-msggateway-headless.%s.svc.cluster.local:%d", instance, statefuleIndex, instance, ns, port)
+	return host
+}
+
+// like openimserver-openim-msggateway-0.openimserver-openim-msggateway-headless.openim-lin.svc.cluster.local:88
+func (cli *K8sDR) getMsgGatewayHost(ctx context.Context) []string {
+	port := 88
+	instance := "openimserver"
+	selfPodName := os.Getenv("MY_POD_NAME")
+	replicas := os.Getenv("MY_MSGGATEWAY_REPLICACOUNT")
+	ns := os.Getenv("MY_POD_NAMESPACE")
+	gatewayEnds := strings.Split(config.Config.RpcRegisterName.OpenImMessageGatewayName, ":")
+	if len(gatewayEnds) != 2 {
+		log.ZError(ctx, "msggateway RpcRegisterName is error:config.Config.RpcRegisterName.OpenImMessageGatewayName", errors.New("config error"))
+	} else {
+		port, _ = strconv.Atoi(gatewayEnds[1])
+	}
+	nReplicas, _ := strconv.Atoi(replicas)
+	podInfo := strings.Split(selfPodName, "-")
+	instance = podInfo[0]
+	var ret []string
+	for i := 0; i < nReplicas; i++ {
+		host := fmt.Sprintf("%s-openim-msggateway-%d.%s-openim-msggateway-headless.%s.svc.cluster.local:%d", instance, i, instance, ns, port)
+		ret = append(ret, host)
+	}
+	log.ZInfo(ctx, "getMsgGatewayHost", "instance", instance, "selfPodName", selfPodName, "replicas", replicas, "ns", ns, "ret", ret)
+	return ret
+}
 func (cli *K8sDR) GetConns(ctx context.Context, serviceName string, opts ...grpc.DialOption) ([]*grpc.ClientConn, error) {
 
+	if serviceName != config.Config.RpcRegisterName.OpenImMessageGatewayName {
 		conn, err := grpc.DialContext(ctx, serviceName, append(cli.options, opts...)...)
 		return []*grpc.ClientConn{conn}, err
+	} else {
+		var ret []*grpc.ClientConn
+		gatewayHosts := cli.getMsgGatewayHost(ctx)
+		for _, host := range gatewayHosts {
+			conn, err := grpc.DialContext(ctx, host, append(cli.options, opts...)...)
+			if err != nil {
+				return nil, err
+			} else {
+				ret = append(ret, conn)
+			}
+		}
+		return ret, nil
+	}
 }
 func (cli *K8sDR) GetConn(ctx context.Context, serviceName string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {