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traffic_management.go
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traffic_management.go
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package aws
import (
"errors"
"fmt"
"log"
awsSDK "github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/elb"
)
type Balancer struct {
Name string
State string
}
type InstanceHealth struct {
InstanceID string
State string
}
func (a *AWS) GetBalancersFromScalingGroup(scalingGroup string) ([]*Balancer, error) {
log.Printf("[DEBUG] Discovering balancers for ASG %q", scalingGroup)
svc := a.autoscalingConn
resp, err := svc.DescribeLoadBalancers(&autoscaling.DescribeLoadBalancersInput{
AutoScalingGroupName: awsSDK.String(scalingGroup),
})
if err != nil {
return nil, err
}
var balancers []*Balancer
for _, b := range resp.LoadBalancers {
balancers = append(balancers, &Balancer{
*b.LoadBalancerName,
*b.State,
})
}
return balancers, nil
}
func (a *AWS) GetInstanceIdsFromScalingGroup(scalingGroup string) ([]*string, error) {
svc := a.autoscalingConn
var instanceIds []*string
resp, err := svc.DescribeAutoScalingGroups(&autoscaling.DescribeAutoScalingGroupsInput{
AutoScalingGroupNames: []*string{awsSDK.String(scalingGroup)},
})
if err != nil {
return instanceIds, err
}
instances := resp.AutoScalingGroups[0].Instances
if len(instances) == 0 {
return nil, fmt.Errorf("No instances found in ASG %q", scalingGroup)
}
for _, i := range instances {
instanceIds = append(instanceIds, i.InstanceId)
}
return instanceIds, nil
}
func (a *AWS) GetAppNameFromScalingGroup(scalingGroup string) (string, error) {
svc := a.autoscalingConn
resp, err := svc.DescribeAutoScalingGroups(&autoscaling.DescribeAutoScalingGroupsInput{
AutoScalingGroupNames: []*string{awsSDK.String(scalingGroup)},
})
if err != nil || len(resp.AutoScalingGroups) == 0 {
return "", fmt.Errorf("Failed getting app name from ASG %s which does not exist", scalingGroup)
}
for _, tag := range resp.AutoScalingGroups[0].Tags {
if *tag.Key == "App" {
return *tag.Value, nil
}
}
return "", fmt.Errorf("Failed getting app name from ASG %s which is missing \"App\" tag", scalingGroup)
}
func (a *AWS) GetScalingGroupForSlotId(environment, appName, slotId string) (string, error) {
log.Printf("[DEBUG] Discovering autoscaling group for %q slot %q", appName, slotId)
svc := a.autoscalingConn
resp, err := svc.DescribeTags(&autoscaling.DescribeTagsInput{
Filters: []*autoscaling.Filter{
{
Name: awsSDK.String("key"),
Values: []*string{
awsSDK.String("Name"),
},
},
{
Name: awsSDK.String("value"),
Values: []*string{
awsSDK.String(fmt.Sprintf("%s-%s-v%s-vinst", environment, appName, slotId)),
},
},
},
})
if err != nil {
return "", err
}
tagCount := len(resp.Tags)
var scalingGroupId string
if tagCount > 1 {
return "", errors.New("More than one ASG for slot " + slotId)
} else if tagCount == 0 {
return "", nil
}
scalingGroupId = *resp.Tags[0].ResourceId
return scalingGroupId, err
}
func (a *AWS) DescribeBalancedInstanceHealth(balancerName string) ([]*InstanceHealth, error) {
svc := a.elbConn
var instances []*InstanceHealth
resp, err := svc.DescribeInstanceHealth(&elb.DescribeInstanceHealthInput{
LoadBalancerName: &balancerName,
})
if err != nil {
return instances, err
}
for _, health := range resp.InstanceStates {
instances = append(instances, &InstanceHealth{
*health.InstanceId,
*health.State,
})
}
return instances, nil
}
func (a *AWS) GetPrivateIpsForInstanceIds(instanceIds []*string) (map[string]string, error) {
svc := a.ec2Conn
data, err := svc.DescribeInstances(&ec2.DescribeInstancesInput{
InstanceIds: instanceIds,
})
if err != nil {
return nil, err
}
var result = make(map[string]string, len(instanceIds))
for _, r := range data.Reservations {
instances := r.Instances
if l := len(instances); l != 1 {
return nil, fmt.Errorf("Expected exactly 1 instance, %d given", l)
}
instance := instances[0]
result[*instance.InstanceId] = *instance.PrivateIpAddress
}
return result, nil
}
func (a *AWS) GetBalancersForApp(appName string) ([]string, error) {
log.Printf("[DEBUG] Discovering load balancers for %q", appName)
var balancers []string
svc := a.elbConn
describeAllResponse, descError := svc.DescribeLoadBalancers(&elb.DescribeLoadBalancersInput{
LoadBalancerNames: []*string{},
})
if descError != nil {
return balancers, descError
}
var allBalancerNames []*string
for _, desc := range describeAllResponse.LoadBalancerDescriptions {
allBalancerNames = append(allBalancerNames, desc.LoadBalancerName)
}
var tagDescriptions []*elb.TagDescription
for len(allBalancerNames) > 0 {
log.Printf("[DEBUG] checking tags for some load balancers: %v", allBalancerNames)
var batchOfNames []*string
if len(allBalancerNames) > 20 {
batchOfNames = allBalancerNames[:20]
} else {
batchOfNames = allBalancerNames
}
tagsResponse, tagsError := svc.DescribeTags(&elb.DescribeTagsInput{
LoadBalancerNames: batchOfNames,
})
if tagsError != nil {
return balancers, tagsError
}
for _, desc := range tagsResponse.TagDescriptions {
tagDescriptions = append(tagDescriptions, desc)
}
allBalancerNames = allBalancerNames[len(batchOfNames):]
}
for _, tagsDescription := range tagDescriptions {
for _, tag := range tagsDescription.Tags {
if *tag.Key == "App" && (*tag.Value == appName) {
balancers = append(balancers, *tagsDescription.LoadBalancerName)
}
}
}
log.Printf("[DEBUG] found load balancers for %q: %q", appName, balancers)
return balancers, nil
}
func (a *AWS) DetachBalancersFromScalingGroup(balancerNames []string, groupName string) error {
svc := a.autoscalingConn
var awsBalancerNames []*string
for _, balancerName := range balancerNames {
awsBalancerNames = append(awsBalancerNames, awsSDK.String(balancerName))
}
_, err := svc.DetachLoadBalancers(&autoscaling.DetachLoadBalancersInput{
AutoScalingGroupName: awsSDK.String(groupName),
LoadBalancerNames: awsBalancerNames,
})
if err != nil {
return err
}
return nil
}
func (a *AWS) AttachBalancersToScalingGroup(balancerNames []string, groupName string) error {
svc := a.autoscalingConn
var awsBalancerNames []*string
for _, balancerName := range balancerNames {
awsBalancerNames = append(awsBalancerNames, awsSDK.String(balancerName))
}
_, err := svc.AttachLoadBalancers(&autoscaling.AttachLoadBalancersInput{
AutoScalingGroupName: awsSDK.String(groupName),
LoadBalancerNames: awsBalancerNames,
})
if err != nil {
return err
}
return nil
}