/
cfn.go
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/
cfn.go
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package cfn
import (
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/client"
"github.com/aws/aws-sdk-go/service/cloudformation"
"github.com/b-b3rn4rd/gocfn/pkg/deployer"
"github.com/b-b3rn4rd/gocfn/pkg/packager"
"github.com/b-b3rn4rd/gocfn/pkg/streamer"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/afero"
)
type Params interface {
String() string
}
type Cfn struct {
dplr deployer.Deployeriface
pckgr packager.Packageriface
stmr streamer.Streameriface
logger *logrus.Logger
}
func Deployer(dplr deployer.Deployeriface) func(cfn *Cfn) {
return func(cfn *Cfn) {
cfn.dplr = dplr
}
}
func Packager(pckgr packager.Packageriface) func(cfn *Cfn) {
return func(cfn *Cfn) {
cfn.pckgr = pckgr
}
}
func Streamer(stmr streamer.Streameriface) func(cfn *Cfn) {
return func(cfn *Cfn) {
cfn.stmr = stmr
}
}
func Logger(logger *logrus.Logger) func(cfn *Cfn) {
return func(cfn *Cfn) {
cfn.logger = logger
}
}
func New(sess client.ConfigProvider, logger *logrus.Logger, streamRequired bool) *Cfn {
cfnSvc := cloudformation.New(sess)
dplr := deployer.New(cfnSvc, logger)
pckgr := packager.New(logger, afero.NewOsFs())
var stmr streamer.Streameriface
if streamRequired {
stmr = streamer.New(cfnSvc, logger)
}
return &Cfn{
dplr: dplr,
pckgr: pckgr,
stmr: stmr,
logger: logger,
}
}
func NewWithOptions(options ...func(cfn *Cfn)) *Cfn {
gocfn := &Cfn{}
for _, option := range options {
option(gocfn)
}
return gocfn
}
func (c *Cfn) Deploy(deployParams *deployer.DeployParams) (interface{}, error) {
changeSet := c.dplr.CreateChangeSet(deployParams)
if changeSet.Err != nil {
return "", errors.Wrap(changeSet.Err, "changeSet creation error")
}
changeSetResult := c.dplr.WaitForChangeSet(
aws.String(deployParams.StackName),
changeSet.ChangeSet.ChangeSetId,
)
changeSet.ChangeSet = changeSetResult.ChangeSet
changeSet.Err = changeSetResult.Err
if changeSet.Err != nil {
isEmptyChangeSet := strings.Contains(changeSet.Err.Error(), "The submitted information didn't contain changes.")
if !deployParams.FailOnEmptyChangeset && isEmptyChangeSet {
return c.dplr.DescribeStackUnsafe(aws.String(deployParams.StackName)), nil
}
return "", errors.Wrap(changeSet.Err, "changeSet creation error")
}
if deployParams.NoExecuteChangeset {
return changeSet.ChangeSet, nil
}
if c.stmr != nil {
seenStackEvents := c.stmr.DescribeStackEvents(aws.String(deployParams.StackName), nil)
if seenStackEvents.Err != nil {
return "", errors.Wrap(seenStackEvents.Err, "error while gathering stack events")
}
changeSet.StackEvents = seenStackEvents.Records
}
err := c.dplr.ExecuteChangeset(aws.String(deployParams.StackName), changeSet.ChangeSet.ChangeSetId)
if err != nil {
return "", errors.Wrap(err, "changeSet execution error")
}
res := c.dplr.WaitForExecute(aws.String(deployParams.StackName), changeSet, c.stmr)
if res.Err != nil {
return "", errors.Wrap(res.Err, "changeSet execution error")
}
return res.Stack, nil
}
func (c *Cfn) Package(packageParams *packager.PackageParams) (string, error) {
template, err := c.pckgr.Export(packageParams)
if err != nil {
return "", errors.Wrap(err, "error while exporting package")
}
raw, err := c.pckgr.Marshall(packageParams.TemplateFile, template)
if err != nil {
return "", errors.Wrap(err, "error while marshalling template")
}
if packageParams.OutputTemplateFile == "" {
c.logger.Debug("output file is not specified, sending to stdout")
return string(raw), nil
}
err = c.pckgr.WriteOutput(aws.String(packageParams.OutputTemplateFile), raw)
if err != nil {
return "", errors.Wrap(err, "error while writing output")
}
return "", nil
}