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route53.go
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route53.go
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package route53
import (
"fmt"
"strings"
"time"
"net"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
awssession "github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/route53"
"github.com/codeamp/circuit/plugins"
"github.com/codeamp/transistor"
log "github.com/codeamp/logger"
)
type Route53 struct {
events chan transistor.Event
}
func init() {
transistor.RegisterPlugin("route53", func() transistor.Plugin {
return &Route53{}
}, plugins.ProjectExtension{})
}
func (x *Route53) Description() string {
return "Set Route53 DNS for Kubernetes services"
}
func (x *Route53) SampleConfig() string {
return ` `
}
func (x *Route53) Start(e chan transistor.Event) error {
x.events = e
log.Info("Started Route53")
return nil
}
func (x *Route53) Stop() {
log.Info("Stopping Route53")
}
func (x *Route53) Subscribe() []string {
return []string{
"project:route53:create",
"project:route53:update",
"project:route53:delete",
}
}
func (x *Route53) Process(e transistor.Event) error {
var err error
log.Debug("Processing route53 event")
if e.Matches("project:route53") {
switch e.Action {
case transistor.GetAction("create"):
log.InfoWithFields(fmt.Sprintf("Process Route53 event: %s", e.Event()), log.Fields{})
err = x.updateRoute53(e)
case transistor.GetAction("update"):
log.InfoWithFields(fmt.Sprintf("Process Route53 event: %s", e.Event()), log.Fields{})
err = x.updateRoute53(e)
default:
log.WarnWithFields(fmt.Sprintf("Unhandled Route53 event: %s", e.Event()), log.Fields{})
}
if err != nil {
x.events <- e.NewEvent(transistor.GetAction("status"), transistor.GetState("failed"), fmt.Sprintf("%v (Action: %v, Step: Route53", err.Error(), e.State))
return nil
}
}
return nil
}
func (x *Route53) sendRoute53Response(e transistor.Event, action transistor.Action, state transistor.State, stateMessage string, lbPayload plugins.ProjectExtension) {
projectExtension := plugins.ProjectExtension{
Environment: lbPayload.Environment,
Project: lbPayload.Project,
}
event := e.NewEvent(action, state, stateMessage)
event.SetPayload(projectExtension)
x.events <- event
}
func (x *Route53) updateRoute53(e transistor.Event) error {
payload := e.Payload.(plugins.ProjectExtension)
elbFQDN, err := e.GetArtifact("loadbalancer_fqdn")
if err != nil {
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), err.Error(), payload)
return nil
}
subdomain, err := e.GetArtifact("subdomain")
if err != nil {
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), err.Error(), payload)
return nil
}
hostedZoneName, err := e.GetArtifact("hosted_zone_name")
if err != nil {
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), err.Error(), payload)
return nil
}
hostedZoneId, err := e.GetArtifact("hosted_zone_id")
if err != nil {
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), err.Error(), payload)
return nil
}
awsAccessKeyId, err := e.GetArtifact("aws_access_key_id")
if err != nil {
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), err.Error(), payload)
return nil
}
awsSecretKey, err := e.GetArtifact("aws_secret_key")
if err != nil {
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), err.Error(), payload)
return nil
}
// Sanity checks
if elbFQDN.String() == "" {
failMessage := fmt.Sprintf("DNS was blank for %s, skipping Route53.", payload.Project.Repository)
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), failMessage, payload)
return nil
}
if subdomain.String() == "" {
failMessage := fmt.Sprintf("Subdomain was blank for %s, skipping Route53.", payload.Project.Repository)
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), failMessage, payload)
}
route53Name := fmt.Sprintf("%s.%s", subdomain.String(), hostedZoneName.String())
log.Info(fmt.Sprintf("Route53 plugin received LoadBalancer success message for %s, %s, %s. Processing.\n", payload.Project.Repository, elbFQDN.String(), e.Action))
// Wait for DNS from the ELB to settle, abort if it does not resolve in initial_wait
// Trying to be conservative with these since we don't want to update Route53 before the new ELB dns record is available
// time.Sleep(time.Second * 300) // TODO: replace initial_wait_seconds
// Query the DNS until it resolves or timeouts
dnsTimeout := 600 // TODO: replace with dns_resolve_timeout_seconds
dnsValid := false
var failMessage string
var dnsLookup []string
var dnsLookupErr error
for dnsValid == false {
dnsLookup, dnsLookupErr = net.LookupHost(elbFQDN.String())
dnsTimeout -= 10
if dnsLookupErr != nil {
failMessage = fmt.Sprintf("Error '%s' resolving DNS for: %s", dnsLookupErr, elbFQDN.String())
} else if len(dnsLookup) == 0 {
failMessage = fmt.Sprintf("Error 'found no names associated with ELB record' while resolving DNS for: %s", elbFQDN.String())
} else {
dnsValid = true
}
if dnsTimeout <= 0 || dnsValid {
break
}
time.Sleep(time.Second * 10)
log.Warn(failMessage + ".. Retrying in 10s")
}
if dnsValid == false {
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), failMessage, payload)
return nil
}
log.Info(fmt.Sprintf("DNS for %s resolved to: %s\n", elbFQDN.String(), strings.Join(dnsLookup, ",")))
// Create the client
sess := awssession.Must(awssession.NewSessionWithOptions(
awssession.Options{
Config: aws.Config{
Credentials: credentials.NewStaticCredentials(awsAccessKeyId.String(), awsSecretKey.String(), ""),
},
},
))
client := route53.New(sess)
// Look for this dns name
params := &route53.ListResourceRecordSetsInput{
HostedZoneId: aws.String(hostedZoneId.String()), // Required
}
foundRecord := false
pageNum := 0
// Route53 has a . on the end of the name
lookFor := fmt.Sprintf("%s.", route53Name)
errList := client.ListResourceRecordSetsPages(params,
func(page *route53.ListResourceRecordSetsOutput, lastPage bool) bool {
pageNum++
for _, p := range page.ResourceRecordSets {
if *p.Name == lookFor {
foundRecord = true
// break out of pagination
return true
}
}
return false
})
if errList != nil {
log.Error(fmt.Sprintf("Error listing ResourceRecordSets for Route53: %s", errList))
return errList
}
if foundRecord {
log.Info(fmt.Sprintf("Route53 found existing record for: %s\n", route53Name))
} else {
log.Info(fmt.Sprintf("Route53 record not found, creating %s\n", route53Name))
}
updateParams := &route53.ChangeResourceRecordSetsInput{
HostedZoneId: aws.String(hostedZoneId.String()),
ChangeBatch: &route53.ChangeBatch{
Changes: []*route53.Change{
{
Action: aws.String("UPSERT"),
ResourceRecordSet: &route53.ResourceRecordSet{
Name: aws.String(route53Name),
Type: aws.String("CNAME"),
ResourceRecords: []*route53.ResourceRecord{
{
Value: aws.String(elbFQDN.String()),
},
},
TTL: aws.Int64(60),
},
},
},
},
}
_, err = client.ChangeResourceRecordSets(updateParams)
if err != nil {
failMessage := fmt.Sprintf("ERROR '%s' setting Route53 DNS for %s", err, route53Name)
x.sendRoute53Response(e, transistor.GetAction("status"), transistor.GetState("failed"), failMessage, payload)
return nil
}
log.Info(fmt.Sprintf("Route53 record UPSERTed for %s: %s", route53Name, elbFQDN.String()))
ev := e.NewEvent(transistor.GetAction("status"), transistor.GetState("complete"), fmt.Sprintf("Route53 record UPSERTed for %s: %s", route53Name, elbFQDN.String()))
ev.AddArtifact("fqdn", fmt.Sprintf("%s.%s", subdomain.String(), hostedZoneName.String()), false)
ev.AddArtifact("lb_fqdn", elbFQDN.String(), false)
x.events <- ev
return nil
}