/
stack.go
267 lines (223 loc) · 6.37 KB
/
stack.go
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package clon
import (
"fmt"
"strings"
"sync"
"time"
log "github.com/sirupsen/logrus"
"github.com/spirius/clon/pkg/cfn"
"github.com/spirius/clon/pkg/closer"
"github.com/juju/errors"
)
const awsCloudFormationStack = "AWS::CloudFormation::Stack"
// StackData represents the stack data.
type StackData struct {
cfn.StackData
ConfigName string
}
type stack struct {
name string
configName string
sm *StackManager
stack *cfn.Stack
nestedStackLock sync.Mutex
nestedStackTracking map[string]*closer.Closer
planned bool
hasChange bool
updated bool
children map[string]*stack
}
func newStack(sm *StackManager, stackName, configName string) (*stack, error) {
cfnStack, err := cfn.NewStack(sm.awsClient.cfnconn, stackName)
if err != nil {
return nil, errors.Annotatef(err, "cannot create new stack %s", stackName)
}
s := &stack{
name: stackName,
configName: configName,
stack: cfnStack,
sm: sm,
nestedStackTracking: make(map[string]*closer.Closer),
children: make(map[string]*stack),
}
return s, nil
}
func (s *stack) stackData() *StackData {
return s.newStackData(s.stack.Data())
}
func (s *stack) newStackData(data *cfn.StackData) *StackData {
if data == nil {
return nil
}
return &StackData{
ConfigName: s.configName,
StackData: *data,
}
}
func (s *stack) newChangeSetName() string {
return fmt.Sprintf("%s-%s-%s", s.name, s.sm.awsClient.sessionName, time.Now().Format("20060102030405"))
}
func (s *stack) addChild(child *stack) error {
if _, ok := s.children[child.configName]; ok {
return nil
}
chain := child.isChild(s.configName)
if chain != nil {
chain = append(chain, s.configName)
return errors.Errorf("cyclic dependency between stacks: %s", strings.Join(chain, " -> "))
}
s.children[child.configName] = child
return nil
}
func (s *stack) isChild(name string) []string {
for n, c := range s.children {
if n == name {
return []string{c.configName, s.configName}
}
r := c.isChild(name)
if r != nil {
return append(r, s.configName)
}
}
return nil
}
// plan create new change set on stack and waits until it finishes.
// It might return both changeSet object and error in case if error
// occurred while waiting.
func (s *stack) plan(stackData *StackData) (*cfn.ChangeSet, error) {
csData := &cfn.ChangeSetData{
Name: s.newChangeSetName(),
StackData: &stackData.StackData,
IsNew: !s.stack.Data().Exists() || s.stack.Data().IsReviewInProgress(),
}
cs, err := cfn.CreateChangeSet(s.sm.awsClient.cfnconn, csData)
if err != nil {
return nil, errors.Annotatef(err, "cannot create change set (%s)", csData.Name)
}
cl := closer.New()
cs.Wait(cfn.ChangeSetWaitConfig{
Callback: func(csData *cfn.ChangeSetData) (bool, error) {
s.sm.emit(csData)
if csData.IsFailed() {
return false, errors.Trace(fmt.Errorf("cannot create change set"))
} else if csData.IsInProgress() {
return true, nil
}
return false, nil
},
Closer: cl,
CloseOnError: true,
CloseOnEnd: true,
})
err = errors.Trace(cl.Wait())
return cs, err
}
func (s *stack) verifyNestedStackTracking(e *cfn.StackEventData, parentCl *closer.Closer) {
stackID := e.PhysicalResourceID
if stackID == "" || e.LogicalResourceID == s.name || e.StackID == s.name {
return
}
s.nestedStackLock.Lock()
defer s.nestedStackLock.Unlock()
cl, ok := s.nestedStackTracking[stackID]
if e.IsComplete() {
if ok {
log.Debugf("removing nested stack tracking for stack '%s'", stackID)
cl.Close(nil)
delete(s.nestedStackTracking, stackID)
}
}
if !ok {
log.Debugf("adding nested stack tracking for stack '%s'", stackID)
cl := parentCl.Child()
s.nestedStackTracking[stackID] = cl
err := s.trackStackEvents(stackID, cl)
if err != nil {
log.Errorf("nested stack '%s' tracking failed: %s", stackID, err)
}
}
}
func (s *stack) trackStackEvents(name string, cl *closer.Closer) error {
log.Debugf("starting stack events tracking for stack '%s'", name)
se, err := cfn.NewStackEvents(s.sm.awsClient.cfnconn, name)
if err != nil {
return errors.Annotatef(err, "cannot track '%s'", name)
}
se.Wait(cfn.StackEventsWaitConfig{
Callback: func(stackEvent *cfn.StackEventData) (bool, error) {
if stackEvent.ResourceType == awsCloudFormationStack {
s.verifyNestedStackTracking(stackEvent, cl)
}
s.sm.emit(stackEvent)
return true, nil
},
Closer: cl,
})
return nil
}
func (s *stack) trackUpdates(fn func(stack *cfn.StackData) (bool, error)) *closer.Closer {
log.Debugf("starting stack update tracking for stack '%s'", s.name)
cl := closer.New()
lastStatus := ""
s.stack.Wait(cfn.StackWaitConfig{
Callback: func(stack *cfn.StackData) (bool, error) {
log.Debugf("received update for stack '%s', status %s", stack.Name, stack.Status)
retry, err := fn(stack)
if retry {
if stack.Status != lastStatus {
s.sm.emit(s.newStackData(stack))
lastStatus = stack.Status
}
}
return retry, errors.Trace(err)
},
Closer: cl,
CloseOnError: true,
CloseOnEnd: true,
})
err := s.trackStackEvents(s.name, cl)
if err != nil {
log.Errorf("cannot track stack events: %s", err)
}
return cl
}
func (s *stack) getChangeSet(csData *cfn.ChangeSetData) (*cfn.ChangeSet, error) {
cs, err := cfn.NewChangeSet(s.sm.awsClient.cfnconn, csData)
if err != nil {
return nil, errors.Trace(err)
}
return cs, nil
}
func (s *stack) execute(csData *cfn.ChangeSetData) (err error) {
cs, err := cfn.NewChangeSet(s.sm.awsClient.cfnconn, csData)
if err != nil {
return errors.Trace(err)
}
if err = cs.Execute(); err != nil {
return errors.Annotatef(err, "cannot execute change set '%s'", csData.Name)
}
cl := s.trackUpdates(func(stack *cfn.StackData) (bool, error) {
if stack.IsInProgress() {
return true, nil
} else if stack.IsComplete() && !stack.IsRollback() {
return false, nil
}
return false, errors.Errorf("stack '%s' has invlid status '%s'", stack.Name, stack.Status)
})
return errors.Trace(cl.Wait())
}
func (s *stack) destroy() error {
err := s.stack.Destroy()
if err != nil {
return errors.Annotatef(err, "cannot destroy stack '%s'", s.name)
}
cl := s.trackUpdates(func(stack *cfn.StackData) (bool, error) {
if stack.IsInProgress() {
return true, nil
} else if !stack.Exists() {
return false, nil
}
return false, errors.Errorf("stack '%s' has invlid status '%s'", stack.Name, stack.Status)
})
return errors.Trace(cl.Wait())
}