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client.go
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client.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/AISphere/ffdl-commons/config"
"github.com/AISphere/ffdl-commons/util"
"github.com/AISphere/ffdl-trainer/trainer/grpc_trainer_v2"
log "github.com/sirupsen/logrus"
"github.com/spf13/viper"
"google.golang.org/grpc"
)
const (
disabled = "disabled"
// TrainerV2LocalAddress exposes the local address that is used if we run with DNS disabled
TrainerV2LocalAddress = ":30005"
)
// TrainerClient is a client interface for interacting with the trainer service.
type TrainerClient interface {
Client() grpc_trainer_v2.TrainerClient
Close() error
}
type trainerClient struct {
client grpc_trainer_v2.TrainerClient
conn *grpc.ClientConn
}
// NewTrainer create a new load-balanced client to talk to the Trainer
// service. If the dns_server config option is set to 'disabled', it will
// default to the pre-defined LocalPort of the service.
func NewTrainer() (TrainerClient, error) {
return NewTrainerWithAddress(TrainerV2LocalAddress)
}
// NewTrainerWithAddress create a new load-balanced client to talk to the Trainer
// service. If the dns_server config option is set to 'disabled', it will
// default to the pre-defined LocalPort of the service.
func NewTrainerWithAddress(addr string) (TrainerClient, error) {
address := fmt.Sprintf("%s.%s.svc.cluster.local:80", config.GetValue(config.TrainerServiceName), config.GetPodNamespace())
dnsServer := viper.GetString("dns_server")
if dnsServer == disabled { // for local testing without DNS server
address = addr
}
dialOpts, err := util.CreateClientDialOpts()
if err != nil {
return nil, err
}
conn, err := grpc.Dial(address, dialOpts...)
if err != nil {
log.Errorf("Could not connect to trainer service: %v", err)
return nil, err
}
return &trainerClient{
conn: conn,
client: grpc_trainer_v2.NewTrainerClient(conn),
}, nil
}
func (c *trainerClient) Client() grpc_trainer_v2.TrainerClient {
return c.client
}
func (c *trainerClient) Close() error {
if c.conn != nil {
return c.conn.Close()
}
return nil
}