/
lcm.go
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/
lcm.go
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/*
* Copyright 2017-2018 IBM Corporation
*
* 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 client
import (
"fmt"
"github.com/grpc-ecosystem/go-grpc-prometheus"
log "github.com/sirupsen/logrus"
"github.com/spf13/viper"
"github.com/IBM/FfDL/commons/config"
"github.com/IBM/FfDL/commons/service"
"github.com/IBM/FfDL/commons/util"
"google.golang.org/grpc"
)
const (
disabled = "disabled"
// LcmLocalPort exposes the port that is used if we run with DNS disabled
LcmLocalPort = 30002
// LcmLocalAddress exposes the local address that is used if we run with DNS disabled
LcmLocalAddress = ":30002"
)
// LcmClient is a client interface for interacting with the LCM service.
type LcmClient interface {
Client() service.LifecycleManagerClient
Close() error
}
type lcmClient struct {
client service.LifecycleManagerClient
conn *grpc.ClientConn
}
// NewLcm create a new client to talk to the LifecycleManager
// service. If the dns_server config option is set to 'disabled/, it will
// default to localhost:port.
func NewLcm(lcm service.LifecycleManagerClient) (LcmClient, error) {
address := fmt.Sprintf("ffdl-lcm.%s.svc.cluster.local:80", config.GetPodNamespace())
dnsServer := viper.GetString("dns_server")
if dnsServer == disabled { // for local testing without DNS server
address = LcmLocalAddress
}
dialOpts, err := util.CreateClientDialOpts()
if err != nil {
return nil, err
}
dialOpts = append(dialOpts, grpc.WithUnaryInterceptor(grpc_prometheus.UnaryClientInterceptor), grpc.WithStreamInterceptor(grpc_prometheus.StreamClientInterceptor))
if lcm == nil {
conn, err := grpc.Dial(address, dialOpts...)
if err != nil {
log.Errorf("Could not connect to lcm service: %v", err)
return nil, err
}
return &lcmClient{
conn: conn,
client: service.NewLifecycleManagerClient(conn),
}, nil
}
return &lcmClient{
conn: nil,
client: lcm,
}, nil
}
func (c *lcmClient) Client() service.LifecycleManagerClient {
return c.client
}
func (c *lcmClient) Close() error {
if c.conn != nil {
return c.conn.Close()
}
return nil
}