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Adds support to store original desired count as an ASG tag.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
| "strconv" | ||
|
|
||
| "github.com/aws/aws-sdk-go/aws" | ||
| "github.com/aws/aws-sdk-go/service/autoscaling" | ||
| "github.com/aws/aws-sdk-go/service/autoscaling/autoscalingiface" | ||
| ) | ||
|
|
||
| const asgTagNameOriginalDesired = "aws-asg-roller/OriginalDesired" | ||
|
|
||
| var ( | ||
| storeOriginalDesiredOnTag = os.Getenv("ROLLER_ORIGINAL_DESIRED_ON_TAG") == "true" | ||
| ) | ||
|
|
||
| // Populates the original desired values for each ASG, based on the current 'desired' value if unkonwn. | ||
| // The original desired value is recorded as a tag on the respective ASG. Subsequent runs attempt to | ||
| // read the value of the tag to preserve state in the case of the process terminating. | ||
| func populateOriginalDesired(originalDesired map[string]int64, asgs []*autoscaling.Group, asgSvc autoscalingiface.AutoScalingAPI) error { | ||
| for _, asg := range asgs { | ||
| asgName := *asg.AutoScalingGroupName | ||
| if storeOriginalDesiredOnTag { | ||
| tagOriginalDesired, err := getOriginalDesiredTag(asgSvc, asgName) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if tagOriginalDesired >= 0 { | ||
| originalDesired[asgName] = tagOriginalDesired | ||
| continue | ||
| } | ||
| } | ||
| // guess based on the current value | ||
| originalDesired[asgName] = *asg.DesiredCapacity | ||
| if verbose { | ||
| log.Printf("guessed desired value of %d from current desired on ASG: %s", *asg.DesiredCapacity, asgName) | ||
| } | ||
| if storeOriginalDesiredOnTag { | ||
| err := setOriginalDesiredTag(asgSvc, asgName, asg) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // attempt to read the original desired value from the ASG tag | ||
| // returns | ||
| // the original desired value from the tag, if present, otherwise -1 | ||
| // error | ||
| func getOriginalDesiredTag(asgSvc autoscalingiface.AutoScalingAPI, asgName string) (int64, error) { | ||
| tags, err := asgSvc.DescribeTags(&autoscaling.DescribeTagsInput{ | ||
| Filters: []*autoscaling.Filter{ | ||
| { | ||
| Name: aws.String("auto-scaling-group"), | ||
| Values: aws.StringSlice([]string{asgName}), | ||
| }, | ||
| { | ||
| Name: aws.String("key"), | ||
| Values: aws.StringSlice([]string{asgTagNameOriginalDesired}), | ||
| }, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return -1, fmt.Errorf("unable to read tag '%s' for ASG %s: %v", asgTagNameOriginalDesired, asgName, err) | ||
| } | ||
| if len(tags.Tags) == 1 { | ||
| if tagOriginalDesired, err := strconv.ParseInt(aws.StringValue(tags.Tags[0].Value), 10, 64); err == nil { | ||
| if verbose { | ||
| log.Printf("read original desired of %d from tag on ASG: %s", tagOriginalDesired, asgName) | ||
| } | ||
| return tagOriginalDesired, nil | ||
| } | ||
| return -1, fmt.Errorf("unable to read tag '%s' for ASG %s: %v", asgTagNameOriginalDesired, asgName, err) | ||
| } | ||
| return -1, nil | ||
| } | ||
|
|
||
| // record original desired value on a tag, in case of process restart | ||
| func setOriginalDesiredTag(asgSvc autoscalingiface.AutoScalingAPI, asgName string, asg *autoscaling.Group) error { | ||
| _, err := asgSvc.CreateOrUpdateTags(&autoscaling.CreateOrUpdateTagsInput{ | ||
| Tags: []*autoscaling.Tag{ | ||
| { | ||
| Key: aws.String(asgTagNameOriginalDesired), | ||
| PropagateAtLaunch: aws.Bool(false), | ||
| ResourceId: aws.String(asgName), | ||
| ResourceType: aws.String("auto-scaling-group"), | ||
| Value: aws.String(strconv.FormatInt(*asg.DesiredCapacity, 10)), | ||
| }, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to set tag '%s' for ASG %s: %v", asgTagNameOriginalDesired, asgName, err) | ||
| } | ||
| if verbose { | ||
| log.Printf("recorded desired value of %d in tag on ASG: %s", *asg.DesiredCapacity, asgName) | ||
| } | ||
| return nil | ||
| } |
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