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Open-IM-Server/pkg/common/discoveryregister/kubernetes/kubernetes.go

200 lines
6.6 KiB

// Copyright © 2023 OpenIM. All rights reserved.
//
// 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 kubernetes
import (
"context"
"errors"
"fmt"
"os"
"strconv"
"strings"
"github.com/openimsdk/tools/discovery"
"github.com/openimsdk/tools/log"
"github.com/stathat/consistent"
"google.golang.org/grpc"
)
// K8sDR represents the Kubernetes service discovery and registration client.
type K8sDR struct {
options []grpc.DialOption
rpcRegisterAddr string
gatewayHostConsistent *consistent.Consistent
gatewayName string
}
func NewK8sDiscoveryRegister(gatewayName string) (discovery.SvcDiscoveryRegistry, error) {
gatewayConsistent := consistent.New()
gatewayHosts := getMsgGatewayHost(context.Background(), gatewayName)
for _, v := range gatewayHosts {
gatewayConsistent.Add(v)
}
return &K8sDR{gatewayHostConsistent: gatewayConsistent}, nil
}
func (cli *K8sDR) Register(serviceName, host string, port int, opts ...grpc.DialOption) error {
if serviceName != cli.gatewayName {
cli.rpcRegisterAddr = serviceName
} else {
cli.rpcRegisterAddr = getSelfHost(context.Background(), cli.gatewayName)
}
return nil
}
func (cli *K8sDR) UnRegister() error {
return nil
}
func (cli *K8sDR) CreateRpcRootNodes(serviceNames []string) error {
return nil
}
func (cli *K8sDR) RegisterConf2Registry(key string, conf []byte) error {
return nil
}
func (cli *K8sDR) GetConfFromRegistry(key string) ([]byte, error) {
return nil, nil
}
func (cli *K8sDR) GetUserIdHashGatewayHost(ctx context.Context, userId string) (string, error) {
host, err := cli.gatewayHostConsistent.Get(userId)
if err != nil {
log.ZError(ctx, "GetUserIdHashGatewayHost error", err)
}
return host, err
}
func getSelfHost(ctx context.Context, gatewayName string) string {
port := 88
instance := "openimserver"
selfPodName := os.Getenv("MY_POD_NAME")
ns := os.Getenv("MY_POD_NAMESPACE")
statefuleIndex := 0
gatewayEnds := strings.Split(gatewayName, ":")
if len(gatewayEnds) != 2 {
log.ZError(ctx, "msggateway RpcRegisterName is error: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.
// Replica set in kubernetes environment
func getMsgGatewayHost(ctx context.Context, gatewayName string) []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(gatewayName, ":")
if len(gatewayEnds) != 2 {
log.ZError(ctx, "msggateway RpcRegisterName is error: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.ZDebug(ctx, "getMsgGatewayHost", "instance", instance, "selfPodName", selfPodName, "replicas", replicas, "ns", ns, "ret", ret)
return ret
}
// GetConns returns the gRPC client connections to the specified service.
func (cli *K8sDR) GetConns(ctx context.Context, serviceName string, opts ...grpc.DialOption) ([]*grpc.ClientConn, error) {
// This conditional checks if the serviceName is not the OpenImMessageGatewayName.
// It seems to handle a special case for the OpenImMessageGateway.
if serviceName != cli.gatewayName {
// DialContext creates a client connection to the given target (serviceName) using the specified context.
// 'cli.options' are likely default or common options for all connections in this struct.
// 'opts...' allows for additional gRPC dial options to be passed and used.
conn, err := grpc.DialContext(ctx, serviceName, append(cli.options, opts...)...)
// The function returns a slice of client connections with the new connection, or an error if occurred.
return []*grpc.ClientConn{conn}, err
} else {
// This block is executed if the serviceName is OpenImMessageGatewayName.
// 'ret' will accumulate the connections to return.
var ret []*grpc.ClientConn
// getMsgGatewayHost presumably retrieves hosts for the message gateway service.
// The context is passed, likely for cancellation and timeout control.
gatewayHosts := getMsgGatewayHost(ctx, cli.gatewayName)
// Iterating over the retrieved gateway hosts.
for _, host := range gatewayHosts {
// Establishes a connection to each host.
// Again, appending cli.options with any additional opts provided.
conn, err := grpc.DialContext(ctx, host, append(cli.options, opts...)...)
// If there's an error while dialing any host, the function returns immediately with the error.
if err != nil {
return nil, err
} else {
// If the connection is successful, it is added to the 'ret' slice.
ret = append(ret, conn)
}
}
// After all hosts are processed, the slice of connections is returned.
return ret, nil
}
}
func (cli *K8sDR) GetConn(ctx context.Context, serviceName string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
return grpc.DialContext(ctx, serviceName, append(cli.options, opts...)...)
}
func (cli *K8sDR) GetSelfConnTarget() string {
return cli.rpcRegisterAddr
}
func (cli *K8sDR) AddOption(opts ...grpc.DialOption) {
cli.options = append(cli.options, opts...)
}
func (cli *K8sDR) CloseConn(conn *grpc.ClientConn) {
conn.Close()
}
// do not use this method for call rpc.
func (cli *K8sDR) GetClientLocalConns() map[string][]*grpc.ClientConn {
log.ZError(context.Background(), "should not call this function!", nil)
return nil
}
func (cli *K8sDR) Close() {
}