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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 main
import (
"flag"
"fmt"
"math/rand"
"time"
exec "github.com/mesos/mesos-go/api/v0/executor"
mesos "github.com/mesos/mesos-go/api/v0/mesosproto"
)
var (
slowTasks = flag.Bool("slow_tasks", false, "When true tasks will take several seconds before responding with TASK_FINISHED; useful for debugging failover")
)
type exampleExecutor struct {
tasksLaunched int
}
func newExampleExecutor() *exampleExecutor {
return &exampleExecutor{tasksLaunched: 0}
}
func (exec *exampleExecutor) Registered(driver exec.ExecutorDriver, execInfo *mesos.ExecutorInfo, fwinfo *mesos.FrameworkInfo, slaveInfo *mesos.SlaveInfo) {
fmt.Println("Registered Executor on slave ", slaveInfo.GetHostname())
}
func (exec *exampleExecutor) Reregistered(driver exec.ExecutorDriver, slaveInfo *mesos.SlaveInfo) {
fmt.Println("Re-registered Executor on slave ", slaveInfo.GetHostname())
}
func (exec *exampleExecutor) Disconnected(driver exec.ExecutorDriver) {
fmt.Println("Executor disconnected.")
}
func (exec *exampleExecutor) LaunchTask(driver exec.ExecutorDriver, taskInfo *mesos.TaskInfo) {
fmt.Println("Launching task", taskInfo.GetName(), "with command", taskInfo.Command.GetValue())
runStatus := &mesos.TaskStatus{
TaskId: taskInfo.GetTaskId(),
State: mesos.TaskState_TASK_RUNNING.Enum(),
}
_, err := driver.SendStatusUpdate(runStatus)
if err != nil {
fmt.Println("Got error", err)
}
exec.tasksLaunched++
fmt.Println("Total tasks launched ", exec.tasksLaunched)
//
// this is where one would perform the requested task
//
finishTask := func() {
// finish task
fmt.Println("Finishing task", taskInfo.GetName())
finStatus := &mesos.TaskStatus{
TaskId: taskInfo.GetTaskId(),
State: mesos.TaskState_TASK_FINISHED.Enum(),
}
if _, err := driver.SendStatusUpdate(finStatus); err != nil {
fmt.Println("error sending FINISHED", err)
}
fmt.Println("Task finished", taskInfo.GetName())
}
if *slowTasks {
starting := &mesos.TaskStatus{
TaskId: taskInfo.GetTaskId(),
State: mesos.TaskState_TASK_STARTING.Enum(),
}
if _, err := driver.SendStatusUpdate(starting); err != nil {
fmt.Println("error sending STARTING", err)
}
delay := time.Duration(rand.Intn(90)+10) * time.Second
go func() {
time.Sleep(delay) // TODO(jdef) add jitter
finishTask()
}()
} else {
finishTask()
}
}
func (exec *exampleExecutor) KillTask(driver exec.ExecutorDriver, taskID *mesos.TaskID) {
fmt.Println("Kill task")
}
func (exec *exampleExecutor) FrameworkMessage(driver exec.ExecutorDriver, msg string) {
fmt.Println("Got framework message: ", msg)
}
func (exec *exampleExecutor) Shutdown(driver exec.ExecutorDriver) {
fmt.Println("Shutting down the executor")
}
func (exec *exampleExecutor) Error(driver exec.ExecutorDriver, err string) {
fmt.Println("Got error message:", err)
}
// -------------------------- func inits () ----------------- //
func init() {
flag.Parse()
}
func main() {
fmt.Println("Starting Example Executor (Go)")
dconfig := exec.DriverConfig{
Executor: newExampleExecutor(),
}
driver, err := exec.NewMesosExecutorDriver(dconfig)
if err != nil {
fmt.Println("Unable to create a ExecutorDriver ", err.Error())
}
_, err = driver.Start()
if err != nil {
fmt.Println("Got error:", err)
return
}
fmt.Println("Executor process has started and running.")
_, err = driver.Join()
if err != nil {
fmt.Println("driver failed:", err)
}
fmt.Println("executor terminating")
}
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