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discover.go
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discover.go
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// Copyright (C) 2014-2018 Goodrain Co., Ltd.
// RAINBOND, Application Management Platform
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version. For any non-GPL usage of Rainbond,
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
// must be obtained first.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package discover
import (
"context"
"os"
"time"
"github.com/goodrain/rainbond/cmd/builder/option"
"github.com/goodrain/rainbond/builder/exector"
"github.com/goodrain/rainbond/mq/api/grpc/client"
"github.com/goodrain/rainbond/mq/api/grpc/pb"
"github.com/Sirupsen/logrus"
grpc1 "google.golang.org/grpc"
)
//WTOPIC is builder
const WTOPIC string = "builder"
//TaskManager task
type TaskManager struct {
ctx context.Context
cancel context.CancelFunc
config option.Config
client *client.MQClient
exec exector.Manager
}
//NewTaskManager return *TaskManager
func NewTaskManager(c option.Config, exec exector.Manager) *TaskManager {
ctx, cancel := context.WithCancel(context.Background())
return &TaskManager{
ctx: ctx,
cancel: cancel,
config: c,
exec: exec,
}
}
//Start 启动
func (t *TaskManager) Start() error {
client, err := client.NewMqClient(t.config.EtcdEndPoints, t.config.MQAPI)
if err != nil {
logrus.Errorf("new Mq client error, %v", err)
return err
}
t.client = client
go t.Do()
logrus.Info("start discover success.")
return nil
}
//Do do
func (t *TaskManager) Do() {
hostName, _ := os.Hostname()
for {
select {
case <-t.ctx.Done():
return
default:
ctx, cancel := context.WithCancel(t.ctx)
data, err := t.client.Dequeue(ctx, &pb.DequeueRequest{Topic: WTOPIC, ClientHost: hostName + "-builder"})
cancel()
if err != nil {
if grpc1.ErrorDesc(err) == context.DeadlineExceeded.Error() {
logrus.Warn(err.Error())
continue
}
if grpc1.ErrorDesc(err) == "context canceled" {
logrus.Warn("grpc dequeue context canceled")
return
}
if grpc1.ErrorDesc(err) == "context timeout" {
logrus.Warn(err.Error())
continue
}
logrus.Error(err.Error())
time.Sleep(time.Second * 2)
continue
}
logrus.Debugf("Receive a task: %s", data.String())
err = t.exec.AddTask(data)
if err != nil {
logrus.Error("add task error:", err.Error())
//TODO:
//速率控制
}
}
}
}
//Stop 停止
func (t *TaskManager) Stop() error {
logrus.Info("discover manager is stoping.")
t.cancel()
if t.client != nil {
t.client.Close()
}
return nil
}