func (c *AWSCluster) fetchStack() error {
stackID := aws.String(c.StackID)
c.base.SendLog("Fetching stack")
var res *cloudformation.DescribeStacksResult
err := c.wrapRequest(func() error {
var err error
res, err = c.cf.DescribeStacks(&cloudformation.DescribeStacksInput{
StackName: stackID,
})
return err
})
if err != nil {
return err
}
if len(res.Stacks) == 0 {
return StackNotFoundError
}
stack := &res.Stacks[0]
if strings.HasPrefix(*stack.StackStatus, "DELETE_") {
return StackNotFoundError
}
c.stack = stack
return nil
}
func (c *AWSCluster) loadKeyPair(name string) error {
keypair, err := loadSSHKey(name)
if err != nil {
return err
}
fingerprint, err := awsutil.FingerprintImportedKey(keypair.PrivateKey)
if err != nil {
return err
}
res, err := c.ec2.DescribeKeyPairs(&ec2.DescribeKeyPairsRequest{
Filters: []ec2.Filter{
{
Name: aws.String("fingerprint"),
Values: []string{fingerprint},
},
},
})
if err != nil {
return err
}
if len(res.KeyPairs) == 0 {
return errors.New("No matching key found")
}
c.base.SSHKey = keypair
for _, p := range res.KeyPairs {
if *p.KeyName == name {
c.base.SSHKeyName = name
return nil
}
}
c.base.SSHKeyName = *res.KeyPairs[0].KeyName
return saveSSHKey(c.base.SSHKeyName, keypair)
}
func (c *AWSCluster) Delete() {
c.cf = cloudformation.New(c.creds, c.Region, nil)
stackEventsSince := time.Now()
c.base.setState("deleting")
if err := c.fetchStack(); err != StackNotFoundError {
if err := c.wrapRequest(func() error {
return c.cf.DeleteStack(&cloudformation.DeleteStackInput{
StackName: aws.String(c.StackName),
})
}); err != nil {
err = fmt.Errorf("Unable to delete stack %s: %s", c.StackName, err)
c.base.SendError(err)
if !c.base.YesNoPrompt(fmt.Sprintf("%s\nWould you like to remove it from the installer?", err.Error())) {
c.base.setState("error")
return
}
} else if err := c.waitForStackCompletion("DELETE", stackEventsSince); err != nil {
c.base.SendError(err)
}
}
if err := c.base.MarkDeleted(); err != nil {
c.base.SendError(err)
}
c.base.sendEvent(&Event{
ClusterID: c.base.ID,
Type: "cluster_state",
Description: "deleted",
})
}
func (c *AWSCluster) Delete() {
c.cf = cloudformation.New(c.creds, c.Region, nil)
stackEventsSince := time.Now()
c.base.setState("deleting")
if err := c.fetchStack(); err != StackNotFoundError {
if err := c.wrapRequest(func() error {
return c.cf.DeleteStack(&cloudformation.DeleteStackInput{
StackName: aws.String(c.StackName),
})
}); err != nil {
c.base.setState("error")
c.base.SendError(fmt.Errorf("Unable to delete stack %s: %s", c.StackName, err))
} else {
if err := c.waitForStackCompletion("DELETE", stackEventsSince); err != nil {
c.base.SendError(err)
}
}
}
if err := c.base.MarkDeleted(); err != nil {
c.base.SendError(err)
}
c.base.sendEvent(&Event{
ClusterID: c.base.ID,
Type: "cluster_state",
Description: "deleted",
})
}
func (c *AWSCluster) configureDNS() error {
// TODO(jvatic): Run directly after receiving zone create complete stack event
c.base.SendLog("Configuring DNS")
// Set region to us-east-1, since any other region will fail for global services like Route53
r53 := route53.New(c.creds, "us-east-1", nil)
res, err := r53.GetHostedZone(&route53.GetHostedZoneRequest{ID: aws.String(c.DNSZoneID)})
if err != nil {
return err
}
if err := c.base.Domain.Configure(res.DelegationSet.NameServers); err != nil {
return err
}
return nil
}
func (c *AWSCluster) waitForStackCompletion(action string, after time.Time) error {
stackID := aws.String(c.StackID)
const actionCompleteSuffix = "_COMPLETE"
const actionFailureSuffix = "_FAILED"
const actionInProgressSuffix = "_IN_PROGRESS"
isComplete := false
isFailed := false
var stackEvents []cloudformation.StackEvent
var nextToken aws.StringValue
var fetchStackEvents func() error
fetchStackEvents = func() error {
res, err := c.cf.DescribeStackEvents(&cloudformation.DescribeStackEventsInput{
NextToken: nextToken,
StackName: stackID,
})
if err != nil {
switch err.(type) {
case *url.Error:
return nil
default:
return err
}
}
// some events are not returned in order
sort.Sort(StackEventSort(res.StackEvents))
for _, se := range res.StackEvents {
if !se.Timestamp.After(after) {
continue
}
stackEventExists := false
for _, e := range stackEvents {
if *e.EventID == *se.EventID {
stackEventExists = true
break
}
}
if stackEventExists {
continue
}
stackEvents = append(stackEvents, se)
if se.ResourceType != nil && se.ResourceStatus != nil {
if *se.ResourceType == "AWS::CloudFormation::Stack" {
if strings.HasSuffix(*se.ResourceStatus, actionInProgressSuffix) && !strings.HasPrefix(*se.ResourceStatus, action) {
isFailed = true
break
}
if strings.HasSuffix(*se.ResourceStatus, actionCompleteSuffix) {
if strings.HasPrefix(*se.ResourceStatus, action) {
isComplete = true
} else {
isFailed = true
}
} else if strings.HasSuffix(*se.ResourceStatus, actionFailureSuffix) {
isFailed = true
}
}
var desc string
if se.ResourceStatusReason != nil {
desc = fmt.Sprintf(" (%s)", *se.ResourceStatusReason)
}
name := *se.ResourceType
if se.LogicalResourceID != nil {
name = fmt.Sprintf("%s (%s)", name, *se.LogicalResourceID)
}
c.base.SendLog(fmt.Sprintf("%s\t%s%s", name, *se.ResourceStatus, desc))
}
}
if res.NextToken != nil {
nextToken = res.NextToken
fetchStackEvents()
}
return nil
}
for {
if err := c.wrapRequest(fetchStackEvents); err != nil {
return err
}
if isComplete {
break
}
if isFailed {
return fmt.Errorf("Failed to create stack %s", c.StackName)
}
time.Sleep(1 * time.Second)
}
return nil
}
func (c *AWSCluster) createStack() error {
c.base.SendLog("Generating start script")
startScript, discoveryToken, err := c.base.genStartScript(c.base.NumInstances, "/dev/xvdb")
if err != nil {
return err
}
c.base.DiscoveryToken = discoveryToken
if err := c.base.saveField("DiscoveryToken", discoveryToken); err != nil {
return err
}
var stackTemplateBuffer bytes.Buffer
err = stackTemplate.Execute(&stackTemplateBuffer, &stackTemplateData{
Instances: make([]struct{}, c.base.NumInstances),
DefaultInstanceType: DefaultInstanceType,
})
if err != nil {
return err
}
stackTemplateString := stackTemplateBuffer.String()
parameters := []cloudformation.Parameter{
{
ParameterKey: aws.String("ImageId"),
ParameterValue: aws.String(c.ImageID),
},
{
ParameterKey: aws.String("ClusterDomain"),
ParameterValue: aws.String(c.base.Domain.Name),
},
{
ParameterKey: aws.String("KeyName"),
ParameterValue: aws.String(c.base.SSHKeyName),
},
{
ParameterKey: aws.String("UserData"),
ParameterValue: aws.String(startScript),
},
{
ParameterKey: aws.String("InstanceType"),
ParameterValue: aws.String(c.InstanceType),
},
{
ParameterKey: aws.String("VpcCidrBlock"),
ParameterValue: aws.String(c.VpcCIDR),
},
{
ParameterKey: aws.String("SubnetCidrBlock"),
ParameterValue: aws.String(c.SubnetCIDR),
},
}
stackEventsSince := time.Now()
if c.StackID != "" && c.StackName != "" {
if err := c.fetchStack(); err == nil && !strings.HasPrefix(*c.stack.StackStatus, "DELETE") {
if c.base.YesNoPrompt(fmt.Sprintf("Stack found from previous installation (%s), would you like to delete it? (a new one will be created either way)", c.StackName)) {
c.base.SendLog(fmt.Sprintf("Deleting stack %s", c.StackName))
if err := c.wrapRequest(func() error {
return c.cf.DeleteStack(&cloudformation.DeleteStackInput{
StackName: aws.String(c.StackName),
})
}); err != nil {
c.base.SendLog(fmt.Sprintf("Unable to delete stack %s: %s", c.StackName, err))
}
}
}
}
c.base.SendLog("Creating stack")
var res *cloudformation.CreateStackResult
err = c.wrapRequest(func() error {
var err error
res, err = c.cf.CreateStack(&cloudformation.CreateStackInput{
OnFailure: aws.String("DELETE"),
StackName: aws.String(c.StackName),
Tags: []cloudformation.Tag{},
TemplateBody: aws.String(stackTemplateString),
TimeoutInMinutes: aws.Integer(10),
Parameters: parameters,
})
return err
})
if err != nil {
return err
}
c.StackID = *res.StackID
if err := c.saveField("StackID", c.StackID); err != nil {
return err
}
return c.waitForStackCompletion("CREATE", stackEventsSince)
}
func (c *AWSCluster) createKeyPair() error {
keypairNames := listSSHKeyNames()
if c.base.SSHKeyName != "" {
newKeypairNames := make([]string, len(keypairNames)+1)
newKeypairNames[0] = c.base.SSHKeyName
for i, name := range keypairNames {
newKeypairNames[i+1] = name
}
keypairNames = newKeypairNames
}
for _, name := range keypairNames {
if err := c.loadKeyPair(name); err == nil {
c.base.SendLog(fmt.Sprintf("Using saved key pair (%s)", c.base.SSHKeyName))
return nil
}
}
keypairName := "flynn"
if c.base.SSHKeyName != "" {
keypairName = c.base.SSHKeyName
}
keypair, err := loadSSHKey(keypairName)
if err == nil {
c.base.SendLog("Importing key pair")
} else {
c.base.SendLog("Creating key pair")
keypair, err = sshkeygen.Generate()
if err != nil {
return err
}
}
enc := base64.StdEncoding
publicKeyBytes := make([]byte, enc.EncodedLen(len(keypair.PublicKey)))
enc.Encode(publicKeyBytes, keypair.PublicKey)
var res *ec2.ImportKeyPairResult
err = c.wrapRequest(func() error {
var err error
res, err = c.ec2.ImportKeyPair(&ec2.ImportKeyPairRequest{
KeyName: aws.String(keypairName),
PublicKeyMaterial: publicKeyBytes,
})
return err
})
if apiErr, ok := err.(aws.APIError); ok && apiErr.Code == "InvalidKeyPair.Duplicate" {
if c.base.YesNoPrompt(fmt.Sprintf("Key pair %s already exists, would you like to delete it?", keypairName)) {
c.base.SendLog("Deleting key pair")
if err := c.wrapRequest(func() error {
return c.ec2.DeleteKeyPair(&ec2.DeleteKeyPairRequest{
KeyName: aws.String(keypairName),
})
}); err != nil {
return err
}
return c.createKeyPair()
}
for {
keypairName = c.base.PromptInput("Please enter a new key pair name")
if keypairName != "" {
c.base.SSHKeyName = keypairName
return c.createKeyPair()
}
}
}
if err != nil {
return err
}
c.base.SSHKey = keypair
c.base.SSHKeyName = *res.KeyName
err = saveSSHKey(keypairName, keypair)
if err != nil {
return err
}
return nil
}
func TestEC2Request(t *testing.T) {
var m sync.Mutex
var httpReq *http.Request
var form url.Values
server := httptest.NewServer(http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
m.Lock()
defer m.Unlock()
httpReq = r
if err := r.ParseForm(); err != nil {
t.Fatal(err)
}
form = r.Form
fmt.Fprintln(w, `<Thing><IpAddress>woo</IpAddress></Thing>`)
},
))
defer server.Close()
client := aws.EC2Client{
Context: aws.Context{
Service: "animals",
Region: "us-west-2",
Credentials: aws.Creds(
"accessKeyID",
"secretAccessKey",
"securityToken",
),
},
Client: http.DefaultClient,
Endpoint: server.URL,
APIVersion: "1.1",
}
req := fakeEC2Request{
PresentString: aws.String("string"),
PresentBoolean: aws.True(),
PresentInteger: aws.Integer(1),
PresentLong: aws.Long(2),
PresentDouble: aws.Double(1.2),
PresentFloat: aws.Float(2.3),
PresentTime: time.Date(2001, 1, 1, 2, 1, 1, 0, time.FixedZone("UTC+1", 3600)),
PresentSlice: []string{"one", "two"},
PresentStruct: &EmbeddedStruct{Value: aws.String("v")},
PresentStructSlice: []EmbeddedStruct{
{Value: aws.String("p")},
{Value: aws.String("q")},
},
}
var resp fakeEC2Response
if err := client.Do("GetIP", "POST", "/", &req, &resp); err != nil {
t.Fatal(err)
}
m.Lock()
defer m.Unlock()
if v, want := httpReq.Method, "POST"; v != want {
t.Errorf("Method was %v but expected %v", v, want)
}
if httpReq.Header.Get("Authorization") == "" {
t.Error("Authorization header is missing")
}
if v, want := httpReq.Header.Get("Content-Type"), "application/x-www-form-urlencoded"; v != want {
t.Errorf("Content-Type was %v but expected %v", v, want)
}
if v, want := httpReq.Header.Get("User-Agent"), "aws-go"; v != want {
t.Errorf("User-Agent was %v but expected %v", v, want)
}
if err := httpReq.ParseForm(); err != nil {
t.Fatal(err)
}
expectedForm := url.Values{
"Action": []string{"GetIP"},
"Version": []string{"1.1"},
"PresentString": []string{"string"},
"PresentBoolean": []string{"true"},
"PresentInteger": []string{"1"},
"PresentLong": []string{"2"},
"PresentDouble": []string{"1.2"},
"PresentFloat": []string{"2.3"},
"PresentTime": []string{"2001-01-01T01:01:01Z"},
"PresentSlice.1": []string{"one"},
"PresentSlice.2": []string{"two"},
"PresentStruct.Value": []string{"v"},
"PresentStructSlice.1.Value": []string{"p"},
"PresentStructSlice.2.Value": []string{"q"},
}
if !reflect.DeepEqual(form, expectedForm) {
t.Errorf("Post body was \n%s\n but expected \n%s", form.Encode(), expectedForm.Encode())
}
if want := (fakeEC2Response{IPAddress: "woo"}); want != resp {
t.Errorf("Response was %#v, but expected %#v", resp, want)
}
}