503 lines
16 KiB
Go
503 lines
16 KiB
Go
package common
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import (
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"context"
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"encoding/base64"
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"fmt"
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"io/ioutil"
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"log"
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"strconv"
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/service/ec2"
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"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
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"github.com/hashicorp/packer/common/retry"
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"github.com/hashicorp/packer/helper/communicator"
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"github.com/hashicorp/packer/helper/multistep"
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"github.com/hashicorp/packer/packer"
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"github.com/hashicorp/packer/template/interpolate"
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)
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type StepRunSpotInstance struct {
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AssociatePublicIpAddress bool
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LaunchMappings BlockDevices
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BlockDurationMinutes int64
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Debug bool
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Comm *communicator.Config
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EbsOptimized bool
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ExpectedRootDevice string
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IamInstanceProfile string
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InstanceInitiatedShutdownBehavior string
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InstanceType string
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SourceAMI string
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SpotPrice string
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SpotPriceProduct string
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SpotTags TagMap
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SpotInstanceTypes []string
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Tags TagMap
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VolumeTags TagMap
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UserData string
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UserDataFile string
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Ctx interpolate.Context
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instanceId string
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spotRequest *ec2.SpotInstanceRequest
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}
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func (s *StepRunSpotInstance) CalculateSpotPrice(az string, ec2conn ec2iface.EC2API) (string, error) {
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// Calculate the spot price for a given availability zone
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spotPrice := s.SpotPrice
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if spotPrice == "auto" {
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// Detect the spot price
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startTime := time.Now().Add(-1 * time.Hour)
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resp, err := ec2conn.DescribeSpotPriceHistory(&ec2.DescribeSpotPriceHistoryInput{
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InstanceTypes: []*string{&s.InstanceType},
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ProductDescriptions: []*string{&s.SpotPriceProduct},
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AvailabilityZone: &az,
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StartTime: &startTime,
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})
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if err != nil {
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return "", fmt.Errorf("Error finding spot price: %s", err)
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}
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var price float64
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for _, history := range resp.SpotPriceHistory {
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log.Printf("[INFO] Candidate spot price: %s", *history.SpotPrice)
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current, err := strconv.ParseFloat(*history.SpotPrice, 64)
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if err != nil {
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log.Printf("[ERR] Error parsing spot price: %s", err)
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continue
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}
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if price == 0 || current < price {
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price = current
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if az == "" {
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az = *history.AvailabilityZone
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}
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}
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}
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if price == 0 {
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return "", fmt.Errorf("No candidate spot prices found!")
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} else {
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// Add 0.5 cents to minimum spot bid to ensure capacity will be available
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// Avoids price-too-low error in active markets which can fluctuate
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price = price + 0.005
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}
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spotPrice = strconv.FormatFloat(price, 'f', -1, 64)
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}
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s.SpotPrice = spotPrice
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return spotPrice, nil
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}
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func (s *StepRunSpotInstance) CreateTemplateData(userData *string, az string,
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state multistep.StateBag, marketOptions *ec2.LaunchTemplateInstanceMarketOptionsRequest) *ec2.RequestLaunchTemplateData {
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// Convert the BlockDeviceMapping into a
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// LaunchTemplateBlockDeviceMappingRequest. These structs are identical,
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// except for the EBS field -- on one, that field contains a
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// LaunchTemplateEbsBlockDeviceRequest, and on the other, it contains an
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// EbsBlockDevice. The EbsBlockDevice and
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// LaunchTemplateEbsBlockDeviceRequest structs are themselves
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// identical except for the struct's name, so you can cast one directly
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// into the other.
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blockDeviceMappings := s.LaunchMappings.BuildEC2BlockDeviceMappings()
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var launchMappingRequests []*ec2.LaunchTemplateBlockDeviceMappingRequest
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for _, mapping := range blockDeviceMappings {
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launchRequest := &ec2.LaunchTemplateBlockDeviceMappingRequest{
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DeviceName: mapping.DeviceName,
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Ebs: (*ec2.LaunchTemplateEbsBlockDeviceRequest)(mapping.Ebs),
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NoDevice: mapping.NoDevice,
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VirtualName: mapping.VirtualName,
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}
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launchMappingRequests = append(launchMappingRequests, launchRequest)
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}
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// Create a launch template.
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templateData := ec2.RequestLaunchTemplateData{
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BlockDeviceMappings: launchMappingRequests,
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DisableApiTermination: aws.Bool(false),
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EbsOptimized: &s.EbsOptimized,
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IamInstanceProfile: &ec2.LaunchTemplateIamInstanceProfileSpecificationRequest{Name: &s.IamInstanceProfile},
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ImageId: &s.SourceAMI,
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InstanceMarketOptions: marketOptions,
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Placement: &ec2.LaunchTemplatePlacementRequest{
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AvailabilityZone: &az,
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},
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UserData: userData,
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}
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// Create a network interface
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securityGroupIds := aws.StringSlice(state.Get("securityGroupIds").([]string))
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subnetId := state.Get("subnet_id").(string)
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if subnetId != "" {
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// Set up a full network interface
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networkInterface := ec2.LaunchTemplateInstanceNetworkInterfaceSpecificationRequest{
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Groups: securityGroupIds,
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DeleteOnTermination: aws.Bool(true),
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DeviceIndex: aws.Int64(0),
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SubnetId: aws.String(subnetId),
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}
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if s.AssociatePublicIpAddress {
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networkInterface.SetAssociatePublicIpAddress(s.AssociatePublicIpAddress)
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}
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templateData.SetNetworkInterfaces([]*ec2.LaunchTemplateInstanceNetworkInterfaceSpecificationRequest{&networkInterface})
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} else {
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templateData.SetSecurityGroupIds(securityGroupIds)
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}
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// If instance type is not set, we'll just pick the lowest priced instance
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// available.
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if s.InstanceType != "" {
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templateData.SetInstanceType(s.InstanceType)
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}
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if s.Comm.SSHKeyPairName != "" {
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templateData.SetKeyName(s.Comm.SSHKeyPairName)
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}
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return &templateData
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}
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func (s *StepRunSpotInstance) LoadUserData() (string, error) {
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userData := s.UserData
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if s.UserDataFile != "" {
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contents, err := ioutil.ReadFile(s.UserDataFile)
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if err != nil {
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return "", fmt.Errorf("Problem reading user data file: %s", err)
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}
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userData = string(contents)
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}
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// Test if it is encoded already, and if not, encode it
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if _, err := base64.StdEncoding.DecodeString(userData); err != nil {
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log.Printf("[DEBUG] base64 encoding user data...")
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userData = base64.StdEncoding.EncodeToString([]byte(userData))
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}
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return userData, nil
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}
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func (s *StepRunSpotInstance) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
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ec2conn := state.Get("ec2").(*ec2.EC2)
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ui := state.Get("ui").(packer.Ui)
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ui.Say("Launching a spot AWS instance...")
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// Get and validate the source AMI
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image, ok := state.Get("source_image").(*ec2.Image)
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if !ok {
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state.Put("error", fmt.Errorf("source_image type assertion failed"))
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return multistep.ActionHalt
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}
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s.SourceAMI = *image.ImageId
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if s.ExpectedRootDevice != "" && *image.RootDeviceType != s.ExpectedRootDevice {
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state.Put("error", fmt.Errorf(
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"The provided source AMI has an invalid root device type.\n"+
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"Expected '%s', got '%s'.",
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s.ExpectedRootDevice, *image.RootDeviceType))
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return multistep.ActionHalt
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}
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azConfig := ""
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if azRaw, ok := state.GetOk("availability_zone"); ok {
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azConfig = azRaw.(string)
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}
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az := azConfig
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ui.Message(fmt.Sprintf("Finding spot price for %s %s...",
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s.SpotPriceProduct, s.InstanceType))
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spotPrice, err := s.CalculateSpotPrice(az, ec2conn)
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if err != nil {
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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ui.Message(fmt.Sprintf("Determined spot instance price of: %s.", spotPrice))
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var instanceId string
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ui.Say("Interpolating tags for spot instance...")
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// s.Tags will tag the eventually launched instance
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// s.SpotTags apply to the spot request itself, and do not automatically
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// get applied to the spot instance that is launched once the request is
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// fulfilled
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if _, exists := s.Tags["Name"]; !exists {
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s.Tags["Name"] = "Packer Builder"
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}
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// Convert tags from the tag map provided by the user into *ec2.Tag s
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ec2Tags, err := s.Tags.EC2Tags(s.Ctx, *ec2conn.Config.Region, state)
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if err != nil {
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err := fmt.Errorf("Error generating tags for source instance: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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// This prints the tags to the ui; it doesn't actually add them to the
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// instance yet
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ec2Tags.Report(ui)
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spotOptions := ec2.LaunchTemplateSpotMarketOptionsRequest{
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MaxPrice: &s.SpotPrice,
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}
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if s.BlockDurationMinutes != 0 {
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spotOptions.BlockDurationMinutes = &s.BlockDurationMinutes
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}
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marketOptions := &ec2.LaunchTemplateInstanceMarketOptionsRequest{
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SpotOptions: &spotOptions,
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}
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marketOptions.SetMarketType(ec2.MarketTypeSpot)
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// Create a launch template for the instance
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ui.Message("Loading User Data File...")
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userData, err := s.LoadUserData()
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if err != nil {
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state.Put("error", err)
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return multistep.ActionHalt
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}
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ui.Message("Creating Spot Fleet launch template...")
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templateData := s.CreateTemplateData(&userData, az, state, marketOptions)
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launchTemplate := &ec2.CreateLaunchTemplateInput{
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LaunchTemplateData: templateData,
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LaunchTemplateName: aws.String("packer-fleet-launch-template"),
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VersionDescription: aws.String("template generated by packer for launching spot instances"),
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}
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// Tell EC2 to create the template
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_, err = ec2conn.CreateLaunchTemplate(launchTemplate)
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if err != nil {
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err := fmt.Errorf("Error creating launch template for spot instance: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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// Add overrides for each user-provided instance type
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var overrides []*ec2.FleetLaunchTemplateOverridesRequest
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for _, instanceType := range s.SpotInstanceTypes {
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override := ec2.FleetLaunchTemplateOverridesRequest{
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InstanceType: aws.String(instanceType),
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}
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overrides = append(overrides, &override)
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}
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createFleetInput := &ec2.CreateFleetInput{
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LaunchTemplateConfigs: []*ec2.FleetLaunchTemplateConfigRequest{
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{
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LaunchTemplateSpecification: &ec2.FleetLaunchTemplateSpecificationRequest{
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LaunchTemplateName: aws.String("packer-fleet-launch-template"),
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Version: aws.String("1"),
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},
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Overrides: overrides,
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},
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},
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ReplaceUnhealthyInstances: aws.Bool(false),
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TargetCapacitySpecification: &ec2.TargetCapacitySpecificationRequest{
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TotalTargetCapacity: aws.Int64(1),
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DefaultTargetCapacityType: aws.String("spot"),
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},
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Type: aws.String("instant"),
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}
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// Create the request for the spot instance.
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req, createOutput := ec2conn.CreateFleetRequest(createFleetInput)
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ui.Message(fmt.Sprintf("Sending spot request (%s)...", req.RequestID))
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// Tag the spot instance request (not the eventual spot instance)
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spotTags, err := s.SpotTags.EC2Tags(s.Ctx, *ec2conn.Config.Region, state)
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if err != nil {
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err := fmt.Errorf("Error generating tags for spot request: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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spotTags.Report(ui)
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if len(spotTags) > 0 && s.SpotTags.IsSet() {
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err = retry.Config{
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Tries: 11,
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ShouldRetry: func(error) bool { return false },
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RetryDelay: (&retry.Backoff{InitialBackoff: 200 * time.Millisecond, MaxBackoff: 30 * time.Second, Multiplier: 2}).Linear,
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}.Run(ctx, func(ctx context.Context) error {
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_, err := ec2conn.CreateTags(&ec2.CreateTagsInput{
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Tags: spotTags,
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Resources: []*string{aws.String(req.RequestID)},
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})
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return err
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})
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if err != nil {
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err := fmt.Errorf("Error tagging spot request: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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}
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// Actually send the spot connection request.
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err = req.Send()
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if err != nil {
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err := fmt.Errorf("Error waiting for spot request (%s) to become ready: %s", req.RequestID, err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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if len(createOutput.Errors) > 0 {
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err := fmt.Errorf("error sending spot request: %s", *createOutput.Errors[0])
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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instanceId = *createOutput.Instances[0].InstanceIds[0]
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// Set the instance ID so that the cleanup works properly
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s.instanceId = instanceId
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ui.Message(fmt.Sprintf("Instance ID: %s", instanceId))
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r, err := ec2conn.DescribeInstances(&ec2.DescribeInstancesInput{
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InstanceIds: []*string{aws.String(instanceId)},
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})
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if err != nil || len(r.Reservations) == 0 || len(r.Reservations[0].Instances) == 0 {
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err := fmt.Errorf("Error finding source instance.")
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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instance := r.Reservations[0].Instances[0]
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// Retry creating tags for about 2.5 minutes
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err = retry.Config{
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Tries: 11,
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ShouldRetry: func(error) bool {
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if awsErr, ok := err.(awserr.Error); ok {
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switch awsErr.Code() {
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case "InvalidInstanceID.NotFound":
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return true
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}
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}
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return false
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},
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RetryDelay: (&retry.Backoff{InitialBackoff: 200 * time.Millisecond, MaxBackoff: 30 * time.Second, Multiplier: 2}).Linear,
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}.Run(ctx, func(ctx context.Context) error {
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_, err := ec2conn.CreateTags(&ec2.CreateTagsInput{
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Tags: ec2Tags,
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Resources: []*string{instance.InstanceId},
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})
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return err
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})
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if err != nil {
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err := fmt.Errorf("Error tagging source instance: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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volumeIds := make([]*string, 0)
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for _, v := range instance.BlockDeviceMappings {
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if ebs := v.Ebs; ebs != nil {
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volumeIds = append(volumeIds, ebs.VolumeId)
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}
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}
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if len(volumeIds) > 0 && s.VolumeTags.IsSet() {
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ui.Say("Adding tags to source EBS Volumes")
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volumeTags, err := s.VolumeTags.EC2Tags(s.Ctx, *ec2conn.Config.Region, state)
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if err != nil {
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err := fmt.Errorf("Error tagging source EBS Volumes on %s: %s", *instance.InstanceId, err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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volumeTags.Report(ui)
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_, err = ec2conn.CreateTags(&ec2.CreateTagsInput{
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Resources: volumeIds,
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Tags: volumeTags,
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})
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if err != nil {
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err := fmt.Errorf("Error tagging source EBS Volumes on %s: %s", *instance.InstanceId, err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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}
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if s.Debug {
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if instance.PublicDnsName != nil && *instance.PublicDnsName != "" {
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ui.Message(fmt.Sprintf("Public DNS: %s", *instance.PublicDnsName))
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}
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if instance.PublicIpAddress != nil && *instance.PublicIpAddress != "" {
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ui.Message(fmt.Sprintf("Public IP: %s", *instance.PublicIpAddress))
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}
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if instance.PrivateIpAddress != nil && *instance.PrivateIpAddress != "" {
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ui.Message(fmt.Sprintf("Private IP: %s", *instance.PrivateIpAddress))
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}
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}
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state.Put("instance", instance)
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return multistep.ActionContinue
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}
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func (s *StepRunSpotInstance) Cleanup(state multistep.StateBag) {
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ec2conn := state.Get("ec2").(*ec2.EC2)
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ui := state.Get("ui").(packer.Ui)
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// Cancel the spot request if it exists
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if s.spotRequest != nil {
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ui.Say("Cancelling the spot request...")
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input := &ec2.CancelSpotInstanceRequestsInput{
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SpotInstanceRequestIds: []*string{s.spotRequest.SpotInstanceRequestId},
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}
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if _, err := ec2conn.CancelSpotInstanceRequests(input); err != nil {
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ui.Error(fmt.Sprintf("Error cancelling the spot request, may still be around: %s", err))
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return
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}
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err := WaitUntilSpotRequestFulfilled(aws.BackgroundContext(), ec2conn, *s.spotRequest.SpotInstanceRequestId)
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if err != nil {
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ui.Error(err.Error())
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}
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}
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// Terminate the source instance if it exists
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if s.instanceId != "" {
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ui.Say("Terminating the source AWS instance...")
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if _, err := ec2conn.TerminateInstances(&ec2.TerminateInstancesInput{InstanceIds: []*string{&s.instanceId}}); err != nil {
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ui.Error(fmt.Sprintf("Error terminating instance, may still be around: %s", err))
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return
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}
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if err := WaitUntilInstanceTerminated(aws.BackgroundContext(), ec2conn, s.instanceId); err != nil {
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ui.Error(err.Error())
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}
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}
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// Delete the launch template used to create the spot fleet
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deleteInput := &ec2.DeleteLaunchTemplateInput{
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LaunchTemplateName: aws.String("packer-fleet-launch-template"),
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}
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if _, err := ec2conn.DeleteLaunchTemplate(deleteInput); err != nil {
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ui.Error(err.Error())
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}
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}
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