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agent.go
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agent.go
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package taskmanager
import (
"fmt"
"time"
)
//NewAgent -- creates a new initialized agent object
func NewAgent(t TaskManagerInterface, callerName string) *Agent {
return &Agent{
killTaskPoller: make(chan bool, 1),
processComplete: make(chan bool, 1),
taskPollEmitter: make(chan bool, 1),
statusEmitter: make(chan string, 1),
taskManager: t,
task: t.NewTask(callerName, TaskAgentLongRunning, AgentTaskStatusInitializing),
}
}
//Run - this begins the running of an agent's async process
func (s *Agent) Run(process func(*Agent) error) {
s.task.Status = AgentTaskStatusRunning
s.statusEmitter <- s.task.Status
s.taskManager.SaveTask(s.task)
go s.startTaskPoller()
go s.listenForPoll()
go func(agent Agent) {
s := &agent
err := process(s)
s.taskPollEmitter <- false
select {
case <-s.processComplete:
if err == nil {
s.task.Status = AgentTaskStatusComplete
} else {
s.task.Status = fmt.Sprintf("status: %s, error: %s", AgentTaskStatusFailed, err.Error())
}
s.task.Expires = 0
s.taskManager.SaveTask(s.task)
s.statusEmitter <- s.task.Status
}
}(*s)
}
//GetTask - get the agents task object
func (s *Agent) GetTask() *Task {
return s.task
}
//GetStatus - returns a status emitting channel
func (s *Agent) GetStatus() chan string {
return s.statusEmitter
}
func (s *Agent) startTaskPoller() {
ForLoop:
for {
select {
case <-s.killTaskPoller:
s.processComplete <- true
break ForLoop
default:
s.taskPollEmitter <- true
}
time.Sleep(AgentTaskPollerInterval)
}
}
func (s *Agent) listenForPoll() {
for <-s.taskPollEmitter {
s.task.Expires = time.Now().Add(AgentTaskPollerTimeout).UnixNano()
s.taskManager.SaveTask(s.task)
}
s.killTaskPoller <- true
}