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aws_elb.go
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aws_elb.go
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package deploy
import (
"fmt"
"time"
"github.com/coldbrewcloud/coldbrew-cli/aws/ec2"
"github.com/coldbrewcloud/coldbrew-cli/aws/ecs"
"github.com/coldbrewcloud/coldbrew-cli/aws/elb"
"github.com/coldbrewcloud/coldbrew-cli/console"
"github.com/coldbrewcloud/coldbrew-cli/core"
"github.com/coldbrewcloud/coldbrew-cli/utils"
"github.com/coldbrewcloud/coldbrew-cli/utils/conv"
)
func (c *Command) prepareELBLoadBalancer(ecsServiceRoleName, ecsTaskContainerName string, ecsTaskContainerPort uint16) (*ecs.LoadBalancer, error) {
elbLoadBalancerName := conv.S(c.conf.AWS.ELBLoadBalancerName)
elbTargetGroupName := conv.S(c.conf.AWS.ELBTargetGroupName)
elbPort := conv.U16(c.conf.LoadBalancer.Port)
_, vpcID, err := c.globalFlags.GetAWSRegionAndVPCID()
if err != nil {
return nil, err
}
// Check if specified ELB Load Balancer exists or not.
elbLoadBalancer, err := c.awsClient.ELB().RetrieveLoadBalancerByName(elbLoadBalancerName)
if err != nil {
return nil, fmt.Errorf("Failed to retrieve ELB Load Balancer [%s]: %s", elbLoadBalancerName, err.Error())
}
if elbLoadBalancer != nil {
// ELB Load Balancer exists
// Check if specified ELB Target Group also exists
// -> if exists, make sure ELB Load Balancer and ELB Target Group actually has a listener between them
// -> if not exists, create new ELB Target Group and a new listener.
elbTargetGroup, err := c.awsClient.ELB().RetrieveTargetGroupByName(elbTargetGroupName)
if err != nil {
return nil, fmt.Errorf("Failed to retrieve ELB Target Group [%s]: %s", elbTargetGroupName, err.Error())
}
if elbTargetGroup != nil {
// ELB Target Group also exists.
// Test if listener between ELB Load Balancer and ELB Target Group actually exists
listenerExists := false
listeners, err := c.awsClient.ELB().RetrieveLoadBalancerListeners(conv.S(elbLoadBalancer.LoadBalancerArn))
if err != nil {
return nil, fmt.Errorf("Failed to retrieve listeners for ELB Load Balancer [%s]: %s", elbLoadBalancerName, err.Error())
}
loop1:
for _, l := range listeners {
for _, a := range l.DefaultActions {
if conv.S(a.TargetGroupArn) == conv.S(elbTargetGroup.TargetGroupArn) {
listenerExists = true
break loop1
}
}
}
if !listenerExists {
return nil, fmt.Errorf("ELB Load Balancer [%s] does not have a listener to ELB Target Group [%s].", elbLoadBalancerName, elbTargetGroupName)
}
return &ecs.LoadBalancer{
ELBTargetGroupARN: conv.S(elbTargetGroup.TargetGroupArn),
TaskContainerName: ecsTaskContainerName,
TaskContainerPort: ecsTaskContainerPort,
}, nil
} else {
// ELB Target Group does not exist; Create a new one.
console.AddingResource("Creating ELB Target Group", elbTargetGroupName, false)
elbTargetGroupARN, err := c.createELBTargetGroup(elbTargetGroupName)
if err != nil {
return nil, err
}
// create HTTP listener
if elbPort > 0 {
console.AddingResource("Adding listener (HTTP) for ELB Load Balancer", elbLoadBalancerName, false)
err = c.awsClient.ELB().CreateListener(
conv.S(elbLoadBalancer.LoadBalancerArn),
elbTargetGroupARN,
elbPort, "HTTP", "")
if err != nil {
return nil, fmt.Errorf("Failed to create ELB Listener: %s", err.Error())
}
}
// create HTTPS listener
httpsPort := conv.U16(c.conf.LoadBalancer.HTTPSPort)
if httpsPort > 0 {
certificateARN := conv.S(c.conf.AWS.ELBCertificateARN)
console.AddingResource("Adding listener (HTTPS) for ELB Load Balancer", elbLoadBalancerName, false)
err = c.awsClient.ELB().CreateListener(conv.S(elbLoadBalancer.LoadBalancerArn), elbTargetGroupARN, httpsPort, "HTTPS", certificateARN)
if err != nil {
return nil, fmt.Errorf("Failed to create ELB Listener (HTTPS): %s", err.Error())
}
}
return &ecs.LoadBalancer{
ELBTargetGroupARN: elbTargetGroupARN,
TaskContainerName: ecsTaskContainerName,
TaskContainerPort: ecsTaskContainerPort,
}, nil
}
} else {
// ELB Load Balancer does not exist.
// Create a new EC2 Security Group for ELB Load Balancer.
// Create a new ELB Target Group
// Create a new ELB Load Balancer.
// Create a new listener between ELB Load Balancer and ELB Target Group.
// create ELB target group
console.AddingResource("Creating ELB Target Group", elbTargetGroupName, false)
elbTargetGroupARN, err := c.createELBTargetGroup(elbTargetGroupName)
if err != nil {
return nil, err
}
// create security group for ELB (if needed)
elbSecurityGroupID, err := c.prepareLoadBalancerSecurityGroup(vpcID)
if err != nil {
return nil, err
}
// create ELB load balancer
elbLoadBalancerARN, err := c.createELBLoadBalancer(elbLoadBalancerName, vpcID, elbSecurityGroupID)
if err != nil {
return nil, err
}
// create HTTP listener
if elbPort > 0 {
console.AddingResource("Adding listener (HTTP) for ELB Load Balancer", elbLoadBalancerName, false)
err = c.awsClient.ELB().CreateListener(elbLoadBalancerARN, elbTargetGroupARN, elbPort, "HTTP", "")
if err != nil {
return nil, fmt.Errorf("Failed to create ELB Listener: %s", err.Error())
}
}
// create HTTPS listener
httpsPort := conv.U16(c.conf.LoadBalancer.HTTPSPort)
if httpsPort > 0 {
certificateARN := conv.S(c.conf.AWS.ELBCertificateARN)
console.AddingResource("Adding listener (HTTPS) for ELB Load Balancer", elbLoadBalancerName, false)
err = c.awsClient.ELB().CreateListener(elbLoadBalancerARN, elbTargetGroupARN, httpsPort, "HTTPS", certificateARN)
if err != nil {
return nil, fmt.Errorf("Failed to create ELB Listener (HTTPS): %s", err.Error())
}
}
return &ecs.LoadBalancer{
ELBTargetGroupARN: elbTargetGroupARN,
TaskContainerName: ecsTaskContainerName,
TaskContainerPort: ecsTaskContainerPort,
}, nil
}
}
func (c *Command) createELBTargetGroup(targetGroupName string) (string, error) {
_, vpcID, err := c.globalFlags.GetAWSRegionAndVPCID()
if err != nil {
return "", err
}
checkInterval, err := core.ParseTimeExpression(conv.S(c.conf.LoadBalancer.HealthCheck.Interval))
if err != nil {
return "", nil
}
timeout, err := core.ParseTimeExpression(conv.S(c.conf.LoadBalancer.HealthCheck.Timeout))
if err != nil {
return "", nil
}
healthCheck := &elb.HealthCheckParams{
CheckIntervalSeconds: uint16(checkInterval),
CheckPath: conv.S(c.conf.LoadBalancer.HealthCheck.Path),
Protocol: "HTTP",
ExpectedHTTPStatusCodes: conv.S(c.conf.LoadBalancer.HealthCheck.Status),
CheckTimeoutSeconds: uint16(timeout),
HealthyThresholdCount: conv.U16(c.conf.LoadBalancer.HealthCheck.HealthyLimit),
UnhealthyThresholdCount: conv.U16(c.conf.LoadBalancer.HealthCheck.UnhealthyLimit),
}
targetGroup, err := c.awsClient.ELB().CreateTargetGroup(targetGroupName, 80, "HTTP", vpcID, healthCheck)
if err != nil {
return "", fmt.Errorf("Failed to create ELB Target Group [%s]: %s", targetGroupName, err.Error())
}
if err := c.awsClient.ELB().CreateTags(conv.S(targetGroup.TargetGroupArn), core.DefaultTagsForAWSResources(targetGroupName)); err != nil {
return "", fmt.Errorf("Failed to tag ELB Target Group [%s]: %s", targetGroupName, err.Error())
}
return conv.S(targetGroup.TargetGroupArn), nil
}
func (c *Command) createELBLoadBalancer(name, vpcID, securityGroupID string) (string, error) {
subnetIDs, err := c.awsClient.EC2().ListVPCSubnets(vpcID)
if err != nil {
return "", fmt.Errorf("Failed to list subnets: %s", err.Error())
}
console.AddingResource("Creating ELB Load Balancer", name, false)
lb, err := c.awsClient.ELB().CreateLoadBalancer(name, true, []string{securityGroupID}, subnetIDs)
if err != nil {
return "", fmt.Errorf("Failed to create ELB Load Balancer [%s]: %s", name, err.Error())
}
if err := c.awsClient.ELB().CreateTags(conv.S(lb.LoadBalancerArn), core.DefaultTagsForAWSResources(name)); err != nil {
return "", fmt.Errorf("Failed to tag ELB Load Balancer [%s]: %s", name, err.Error())
}
return conv.S(lb.LoadBalancerArn), nil
}
func (c *Command) prepareLoadBalancerSecurityGroup(vpcID string) (string, error) {
elbSecurityGroupName := conv.S(c.conf.AWS.ELBSecurityGroupName)
httpPort := conv.U16(c.conf.LoadBalancer.Port)
httpsPort := conv.U16(c.conf.LoadBalancer.HTTPSPort)
securityGroup, err := c.awsClient.EC2().RetrieveSecurityGroupByNameOrID(elbSecurityGroupName)
if err != nil {
return "", fmt.Errorf("Failed to retrieve EC2 Security Group [%s]: %s", elbSecurityGroupName, err.Error())
}
if securityGroup == nil {
// create a new one if specified security group does not exists
return c.createLoadBalancerSecurityGroup(vpcID, httpPort, httpsPort, elbSecurityGroupName)
}
return conv.S(securityGroup.GroupId), nil
}
func (c *Command) createLoadBalancerSecurityGroup(vpcID string, httpPort, httpsPort uint16, securityGroupName string) (string, error) {
console.AddingResource("Creating EC2 Security Group", securityGroupName, false)
securityGroupID, err := c.awsClient.EC2().CreateSecurityGroup(securityGroupName, securityGroupName, vpcID)
if err != nil {
return "", fmt.Errorf("Failed to create EC2 Security Group [%s]: %s", securityGroupName, err.Error())
}
err = utils.RetryOnAWSErrorCode(func() error {
return c.awsClient.EC2().CreateTags(securityGroupID, core.DefaultTagsForAWSResources(securityGroupName))
}, []string{"InvalidGroup.NotFound"}, time.Second, 5*time.Minute)
if err != nil {
return "", fmt.Errorf("Failed to tag EC2 Security Group [%s]: %s", securityGroupName, err.Error())
}
// add load balancer inbound rule (HTTP)
if httpPort > 0 {
console.UpdatingResource(fmt.Sprintf("Adding inbound rule [%s:%d:%s] to EC2 Security Group",
ec2.SecurityGroupProtocolTCP, httpPort, "0.0.0.0/0"),
securityGroupName, false)
err = c.awsClient.EC2().AddInboundToSecurityGroup(
securityGroupID,
ec2.SecurityGroupProtocolTCP,
httpPort, httpPort, "0.0.0.0/0")
if err != nil {
return "", fmt.Errorf("Failed to add inbound rule to EC2 Security Group [%s]: %s", securityGroupName, err.Error())
}
}
// add load balancer inbound rule (HTTPS)
if httpsPort > 0 {
console.UpdatingResource(fmt.Sprintf("Adding inbound rule [%s:%d:%s] to EC2 Security Group",
ec2.SecurityGroupProtocolTCP, httpsPort, "0.0.0.0/0"),
securityGroupName, false)
err = c.awsClient.EC2().AddInboundToSecurityGroup(
securityGroupID,
ec2.SecurityGroupProtocolTCP,
httpsPort, httpsPort, "0.0.0.0/0")
if err != nil {
return "", fmt.Errorf("Failed to add inbound rule to EC2 Security Group [%s]: %s", securityGroupName, err.Error())
}
}
// add inbound rule to ECS instance security group
ecsInstancesSecurityGroupName := core.DefaultInstanceSecurityGroupName(conv.S(c.conf.ClusterName))
ecsInstancesSecurityGroup, err := c.awsClient.EC2().RetrieveSecurityGroupByName(ecsInstancesSecurityGroupName)
if err != nil {
return "", fmt.Errorf("Failed to retrieve EC2 Security Group [%s]: %s", ecsInstancesSecurityGroupName, err.Error())
}
if ecsInstancesSecurityGroup == nil {
return "", fmt.Errorf("EC2 Security Group [%s] for ECS Container Instances was not found.", ecsInstancesSecurityGroupName)
}
console.UpdatingResource(fmt.Sprintf("Adding inbound rule [%s:%d:%s] to EC2 Security Group",
ec2.SecurityGroupProtocolTCP, 0, securityGroupID),
ecsInstancesSecurityGroupName, false)
err = c.awsClient.EC2().AddInboundToSecurityGroup(
conv.S(ecsInstancesSecurityGroup.GroupId),
ec2.SecurityGroupProtocolTCP,
0, 65535, securityGroupID)
if err != nil {
return "", fmt.Errorf("Failed to add inbound rule to EC2 Security Group [%s]: %s", ecsInstancesSecurityGroupName, err.Error())
}
return securityGroupID, nil
}
func (c *Command) checkLoadBalancerHealthCheckChanges(elbTargetGroupARN string) error {
// retrieve ELB Target Group
elbTargetGroup, err := c.awsClient.ELB().RetrieveTargetGroup(elbTargetGroupARN)
if err != nil {
return fmt.Errorf("Failed to retrieve ELB Target Group [%s]: %s", elbTargetGroupARN, err.Error())
}
if elbTargetGroup == nil {
return fmt.Errorf("ELB Target Group [%s] was not found.", elbTargetGroupARN)
}
// compare health check configurations
checkInterval, err := core.ParseTimeExpression(conv.S(c.conf.LoadBalancer.HealthCheck.Interval))
if err != nil {
return nil
}
timeout, err := core.ParseTimeExpression(conv.S(c.conf.LoadBalancer.HealthCheck.Timeout))
if err != nil {
return nil
}
currentStatusMatcher := ""
if elbTargetGroup.Matcher != nil {
currentStatusMatcher = conv.S(elbTargetGroup.Matcher.HttpCode)
}
if conv.I64(elbTargetGroup.HealthCheckIntervalSeconds) != int64(checkInterval) ||
conv.I64(elbTargetGroup.HealthCheckTimeoutSeconds) != int64(timeout) ||
conv.S(elbTargetGroup.HealthCheckPath) != conv.S(c.conf.LoadBalancer.HealthCheck.Path) ||
conv.I64(elbTargetGroup.HealthyThresholdCount) != int64(conv.U16(c.conf.LoadBalancer.HealthCheck.HealthyLimit)) ||
conv.I64(elbTargetGroup.UnhealthyThresholdCount) != int64(conv.U16(c.conf.LoadBalancer.HealthCheck.UnhealthyLimit)) ||
currentStatusMatcher != conv.S(c.conf.LoadBalancer.HealthCheck.Status) {
// need to update Target Group health check settings
healthCheckParams := &elb.HealthCheckParams{
CheckIntervalSeconds: uint16(checkInterval),
CheckPath: conv.S(c.conf.LoadBalancer.HealthCheck.Path),
Protocol: "HTTP",
ExpectedHTTPStatusCodes: conv.S(c.conf.LoadBalancer.HealthCheck.Status),
CheckTimeoutSeconds: uint16(timeout),
HealthyThresholdCount: conv.U16(c.conf.LoadBalancer.HealthCheck.HealthyLimit),
UnhealthyThresholdCount: conv.U16(c.conf.LoadBalancer.HealthCheck.UnhealthyLimit),
}
console.UpdatingResource("Updating ELB Target Group health check parameters", conv.S(elbTargetGroup.TargetGroupName), false)
if err := c.awsClient.ELB().UpdateTargetGroupHealthCheck(elbTargetGroupARN, healthCheckParams); err != nil {
return fmt.Errorf("Failed to update ELB Target Group [%s]: %s", elbTargetGroupARN, err.Error())
}
}
return nil
}