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task_handler_types.go
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/
task_handler_types.go
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// Copyright 2014-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 eventhandler
import (
"container/list"
"fmt"
"sync"
"github.com/aws/amazon-ecs-agent/agent/api"
"github.com/aws/amazon-ecs-agent/agent/statemanager"
"github.com/aws/amazon-ecs-agent/agent/utils"
"github.com/cihub/seelog"
)
// a state change that may have a container and, optionally, a task event to
// send
type sendableEvent struct {
// Either is a contaienr event or a task event
isContainerEvent bool
containerSent bool
containerChange api.ContainerStateChange
taskSent bool
taskChange api.TaskStateChange
lock sync.RWMutex
}
func newSendableContainerEvent(event api.ContainerStateChange) *sendableEvent {
return &sendableEvent{
isContainerEvent: true,
containerSent: false,
containerChange: event,
}
}
func newSendableTaskEvent(event api.TaskStateChange) *sendableEvent {
return &sendableEvent{
isContainerEvent: false,
taskSent: false,
taskChange: event,
}
}
func (event *sendableEvent) taskArn() string {
if event.isContainerEvent {
return event.containerChange.TaskArn
}
return event.taskChange.TaskARN
}
// taskShouldBeSent checks whether the event should be sent, this includes
// both task state change and container state change events
func (event *sendableEvent) taskShouldBeSent() bool {
event.lock.RLock()
defer event.lock.RUnlock()
if event.isContainerEvent {
return false
}
tevent := event.taskChange
if event.taskSent {
return false // redundant event
}
// task and container change event should have task != nil
if tevent.Task == nil {
return false
}
// Task event should be sent
if tevent.Task.GetSentStatus() < tevent.Status {
return true
}
// Container event should be sent
for _, containerStateChange := range tevent.Containers {
container := containerStateChange.Container
if container.GetSentStatus() < container.GetKnownStatus() {
// We found a container that needs its state
// change to be sent to ECS.
return true
}
}
return false
}
func (event *sendableEvent) taskAttachmentShouldBeSent() bool {
event.lock.RLock()
defer event.lock.RUnlock()
if event.isContainerEvent {
return false
}
tevent := event.taskChange
return tevent.Status == api.TaskStatusNone && // Task Status is not set for attachments as task record has yet to be streamed down
tevent.Attachment != nil && // Task has attachment records
!tevent.Attachment.HasExpired() && // ENI attachment ack timestamp hasn't expired
!tevent.Attachment.IsSent() // Task status hasn't already been sent
}
func (event *sendableEvent) containerShouldBeSent() bool {
event.lock.RLock()
defer event.lock.RUnlock()
if !event.isContainerEvent {
return false
}
cevent := event.containerChange
if event.containerSent || (cevent.Container != nil && cevent.Container.GetSentStatus() >= cevent.Status) {
return false
}
return true
}
func (event *sendableEvent) setSent() {
event.lock.Lock()
defer event.lock.Unlock()
if event.isContainerEvent {
event.containerSent = true
} else {
event.taskSent = true
}
}
// send tries to send an event, specified by 'eventToSubmit', of type
// 'eventType' to ECS
func (event *sendableEvent) send(
sendStatusToECS sendStatusChangeToECS,
setChangeSent setStatusSent,
eventType string,
client api.ECSClient,
eventToSubmit *list.Element,
stateSaver statemanager.Saver,
backoff utils.Backoff,
taskEvents *taskSendableEvents) error {
seelog.Infof("TaskHandler: Sending %s change: %s", eventType, event.toString())
// Try submitting the change to ECS
if err := sendStatusToECS(client, event); err != nil {
seelog.Errorf("TaskHandler: Unretriable error submitting %s state change [%s]: %v",
eventType, event.toString(), err)
return err
}
// submitted; ensure we don't retry it
event.setSent()
// Mark event as sent
setChangeSent(event)
// Update the state file
stateSaver.Save()
seelog.Debugf("TaskHandler: Submitted container state change: %s", event.toString())
taskEvents.events.Remove(eventToSubmit)
backoff.Reset()
return nil
}
// sendStatusChangeToECS defines a function type for invoking the appropriate ECS state change API
type sendStatusChangeToECS func(client api.ECSClient, event *sendableEvent) error
// sendContainerStatusToECS invokes the SubmitContainerStateChange API to send a
// container status change to ECS
func sendContainerStatusToECS(client api.ECSClient, event *sendableEvent) error {
return client.SubmitContainerStateChange(event.containerChange)
}
// sendTaskStatusToECS invokes the SubmitTaskStateChange API to send a task
// status change to ECS
func sendTaskStatusToECS(client api.ECSClient, event *sendableEvent) error {
return client.SubmitTaskStateChange(event.taskChange)
}
// setStatusSent defines a function type to mark the event as sent
type setStatusSent func(event *sendableEvent)
// setContainerChangeSent sets the event's container change object as sent
func setContainerChangeSent(event *sendableEvent) {
if event.containerChange.Container != nil {
event.containerChange.Container.SetSentStatus(event.containerChange.Status)
}
}
// setTaskChangeSent sets the event's task change object as sent
func setTaskChangeSent(event *sendableEvent) {
if event.taskChange.Task != nil {
event.taskChange.Task.SetSentStatus(event.taskChange.Status)
}
for _, containerStateChange := range event.taskChange.Containers {
container := containerStateChange.Container
container.SetSentStatus(containerStateChange.Status)
}
}
// setTaskAttachmentSent sets the event's task attachment object as sent
func setTaskAttachmentSent(event *sendableEvent) {
if event.taskChange.Attachment != nil {
event.taskChange.Attachment.SetSentStatus()
event.taskChange.Attachment.StopAckTimer()
}
}
func (event *sendableEvent) toString() string {
event.lock.RLock()
defer event.lock.RUnlock()
if event.isContainerEvent {
return "ContainerChange: [" + event.containerChange.String() + fmt.Sprintf("] sent: %t", event.containerSent)
} else {
return "TaskChange: [" + event.taskChange.String() + fmt.Sprintf("] sent: %t", event.taskSent)
}
}