resources: aws: ec2: Refactor CheckApply
CheckApply was rewritten, using the new describe methods to improve readability and maintainability.
This commit is contained in:
Jonathan Gold
committed by
James Shubin
James Shubin
parent
67837a47ac
commit
032d0992d6
@@ -675,169 +675,137 @@ func (obj *AwsEc2Res) snsWatch() error {
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func (obj *AwsEc2Res) CheckApply(apply bool) (checkOK bool, err error) {
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log.Printf("%s: CheckApply(%t)", obj, apply)
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diInput := ec2.DescribeInstancesInput{
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Filters: []*ec2.Filter{
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{
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Name: aws.String("tag:Name"),
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Values: []*string{aws.String(obj.prependName())},
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},
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{
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Name: aws.String("instance-state-name"),
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Values: []*string{
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aws.String("running"),
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aws.String("pending"),
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aws.String("stopped"),
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aws.String("stopping"),
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},
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},
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},
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}
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diOutput, err := obj.client.DescribeInstances(&diInput)
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// find the instance we need to check
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instance, err := describeInstanceByName(obj.client, obj.prependName())
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if err != nil {
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return false, errwrap.Wrapf(err, "error describing instances")
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return false, errwrap.Wrapf(err, "error describing instance")
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}
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if instance == nil {
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return false, fmt.Errorf("instance is nil")
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}
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if len(diOutput.Reservations) < 1 && obj.State == "terminated" {
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// If the instance is in a transitional state, Watch will send a new event
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// when the instance finishes its transition. Since we can't apply the
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// desired state until the instance is stopped, running, or terminated, we
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// return and wait for the next event.
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switch aws.StringValue(instance.State.Name) {
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case ec2.InstanceStateNamePending, ec2.InstanceStateNameStopping:
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return false, nil
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default:
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}
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// if the instance is in the correct state, we're done
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if obj.State == aws.StringValue(instance.State.Name) {
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return true, nil
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}
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if len(diOutput.Reservations) == 1 && *diOutput.Reservations[0].Instances[0].State.Name == obj.State {
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// if the instance is terminated and should be stopped, we're done
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if obj.State == ec2.InstanceStateNameStopped && aws.StringValue(instance.InstanceId) == "" {
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return true, nil
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}
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if !apply {
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return false, nil
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}
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if len(diOutput.Reservations) > 1 {
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return false, fmt.Errorf("too many reservations")
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}
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ctx, cancel := context.WithTimeout(context.TODO(), waitTimeout*time.Second)
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defer cancel()
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if len(diOutput.Reservations) == 1 {
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instanceID := diOutput.Reservations[0].Instances[0].InstanceId
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describeInput := &ec2.DescribeInstancesInput{
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InstanceIds: []*string{instanceID},
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}
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if len(diOutput.Reservations[0].Instances) > 1 {
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return false, fmt.Errorf("more than one instance was returned")
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}
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if obj.State == "running" {
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startInput := &ec2.StartInstancesInput{
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InstanceIds: []*string{instanceID},
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}
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_, err := obj.client.StartInstances(startInput)
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if err != nil {
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// If the instance is not in a state where it
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// can be started, we can't do anything.
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if aerr, ok := err.(awserr.Error); ok {
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if aerr.Code() == AwsErrIncorrectInstanceState {
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return false, nil
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}
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}
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return false, errwrap.Wrapf(err, "error starting instance")
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}
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if err := obj.client.WaitUntilInstanceRunningWithContext(ctx, describeInput); err != nil {
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if aerr, ok := err.(awserr.Error); ok {
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if aerr.Code() == request.CanceledErrorCode {
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return false, errwrap.Wrapf(err, "timeout while waiting for instance to start")
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}
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}
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return false, errwrap.Wrapf(err, "unknown error waiting for instance to start")
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}
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log.Printf("%s: instance running", obj)
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}
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if obj.State == "stopped" {
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stopInput := &ec2.StopInstancesInput{
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InstanceIds: []*string{instanceID},
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}
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_, err := obj.client.StopInstances(stopInput)
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if err != nil {
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// If the instance is not in a state where it
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// can be stopped, we can't do anything.
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if aerr, ok := err.(awserr.Error); ok {
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if aerr.Code() == AwsErrIncorrectInstanceState {
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return false, nil
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}
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}
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return false, errwrap.Wrapf(err, "error stopping instance")
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}
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if err := obj.client.WaitUntilInstanceStoppedWithContext(ctx, describeInput); err != nil {
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if aerr, ok := err.(awserr.Error); ok {
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if aerr.Code() == request.CanceledErrorCode {
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return false, errwrap.Wrapf(err, "timeout while waiting for instance to stop")
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}
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}
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return false, errwrap.Wrapf(err, "unknown error waiting for instance to stop")
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}
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log.Printf("%s: instance stopped", obj)
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}
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if obj.State == "terminated" {
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terminateInput := &ec2.TerminateInstancesInput{
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InstanceIds: []*string{instanceID},
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}
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_, err := obj.client.TerminateInstances(terminateInput)
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if err != nil {
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// If the instance is not in a state where it
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// can be terminated, we can't do anything.
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if aerr, ok := err.(awserr.Error); ok {
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if aerr.Code() == "IncorrectInstanceState" {
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return false, nil
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}
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}
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return false, errwrap.Wrapf(err, "error terminating instance")
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}
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if err := obj.client.WaitUntilInstanceTerminatedWithContext(ctx, describeInput); err != nil {
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if aerr, ok := err.(awserr.Error); ok {
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if aerr.Code() == request.CanceledErrorCode {
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return false, errwrap.Wrapf(err, "timeout while waiting for instance to terminate")
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}
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}
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return false, errwrap.Wrapf(err, "unknown error waiting for instance to terminate")
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}
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log.Printf("%s: instance terminated", obj)
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}
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}
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if len(diOutput.Reservations) < 1 && obj.State == "running" {
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runParams := &ec2.RunInstancesInput{
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// If the instance is terminated or does not exist, and should be running,
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// launch it with the defined parameters.
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if obj.State == ec2.InstanceStateNameRunning && aws.StringValue(instance.InstanceId) == "" {
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runOutput, err := obj.client.RunInstances(&ec2.RunInstancesInput{
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ImageId: aws.String(obj.ImageID),
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InstanceType: aws.String(obj.Type),
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}
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runParams.SetMinCount(1)
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runParams.SetMaxCount(1)
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if obj.UserData != "" {
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userData := base64.StdEncoding.EncodeToString([]byte(obj.UserData))
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runParams.SetUserData(userData)
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}
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runResult, err := obj.client.RunInstances(runParams)
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MinCount: aws.Int64(1),
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MaxCount: aws.Int64(1),
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UserData: aws.String(obj.UserData),
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})
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if err != nil {
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return false, errwrap.Wrapf(err, "could not create instance")
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return false, errwrap.Wrapf(err, "error running instance")
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}
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// error if runInstances doesn't return exactly one instance
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if len(runOutput.Instances) != 1 {
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return false, fmt.Errorf("incorrect number of instances")
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}
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// add the name tag
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_, err = obj.client.CreateTags(&ec2.CreateTagsInput{
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Resources: []*string{runResult.Instances[0].InstanceId},
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Resources: []*string{runOutput.Instances[0].InstanceId},
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Tags: []*ec2.Tag{
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{
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Key: aws.String("Name"),
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Key: aws.String(nameKey),
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Value: aws.String(obj.prependName()),
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},
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},
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})
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if err != nil {
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return false, errwrap.Wrapf(err, "could not create tags for instance")
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return false, errwrap.Wrapf(err, "could not create name tag")
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}
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describeInput := &ec2.DescribeInstancesInput{
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InstanceIds: []*string{runResult.Instances[0].InstanceId},
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// get the latest metadata
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instance, err = describeInstanceByID(obj.client, runOutput.Instances[0].InstanceId)
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if err != nil {
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return false, errwrap.Wrapf(err, "error describing instance")
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}
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}
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// Apply the correct state. If we just launched the instance, it's okay to
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// start it, as the function will return as normal, and execution will
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// continue onto the waiters.
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switch obj.State {
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case ec2.InstanceStateNameRunning:
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_, err = obj.client.StartInstances(&ec2.StartInstancesInput{
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InstanceIds: []*string{instance.InstanceId},
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})
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case ec2.InstanceStateNameStopped:
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_, err = obj.client.StopInstances(&ec2.StopInstancesInput{
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InstanceIds: []*string{instance.InstanceId},
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})
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case ec2.InstanceStateNameTerminated:
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_, err = obj.client.TerminateInstances(&ec2.TerminateInstancesInput{
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InstanceIds: []*string{instance.InstanceId},
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})
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}
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if err != nil {
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if aerr, ok := err.(awserr.Error); ok {
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// if the instance is in a transitional state, return and wait for
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// the next event.
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if aerr.Code() == AwsErrIncorrectInstanceState {
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return false, nil
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}
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}
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return false, errwrap.Wrapf(err, "error applying state")
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}
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// context to cancel the waiter if it takes too long
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ctx, cancel := context.WithTimeout(context.TODO(), waitTimeout*time.Second)
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defer cancel()
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// wait until the state converges
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waitInput := &ec2.DescribeInstancesInput{
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InstanceIds: []*string{instance.InstanceId},
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}
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switch obj.State {
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case ec2.InstanceStateNameRunning:
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err = obj.client.WaitUntilInstanceRunningWithContext(ctx, waitInput)
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case ec2.InstanceStateNameStopped:
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err = obj.client.WaitUntilInstanceStoppedWithContext(ctx, waitInput)
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case ec2.InstanceStateNameTerminated:
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err = obj.client.WaitUntilInstanceTerminatedWithContext(ctx, waitInput)
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default:
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return false, errwrap.Wrapf(err, "unrecognized instance state")
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}
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err = obj.client.WaitUntilInstanceRunningWithContext(ctx, describeInput)
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if err != nil {
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if aerr, ok := err.(awserr.Error); ok {
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if aerr.Code() == request.CanceledErrorCode {
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return false, errwrap.Wrapf(err, "timeout while waiting for instance to start")
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return false, errwrap.Wrapf(err, "waiter context cancelled")
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}
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}
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return false, errwrap.Wrapf(err, "unknown error waiting for instance to start")
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return false, errwrap.Wrapf(err, "waiter error")
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}
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log.Printf("%s: instance running", obj)
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// update the metadata before we return for send/recv
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instance, err = describeInstanceByID(obj.client, instance.InstanceId)
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if err != nil {
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return false, errwrap.Wrapf(err, "error descrining instance")
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}
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return false, nil
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}
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