/
cloudconfig.go
145 lines (120 loc) · 3.33 KB
/
cloudconfig.go
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package template
import (
"bytes"
"compress/gzip"
"encoding/base64"
"fmt"
"log"
"strings"
"text/template"
"github.com/giantswarm/microerror"
"github.com/giantswarm/k8scloudconfig/v14/pkg/ignition"
)
const (
InitialClusterStateNew = "new"
InitialClusterStateExisting = "existing"
)
type CloudConfigConfig struct {
Params Params
Template string
}
type CloudConfig struct {
config string
params Params
template string
}
func NewCloudConfig(config CloudConfigConfig) (*CloudConfig, error) {
if err := config.Params.Validate(); err != nil {
return nil, microerror.Maskf(invalidConfigError, "%T.%s", config, err)
}
if config.Template == "" {
return nil, microerror.Maskf(invalidConfigError, "config.Template must not be empty")
}
if config.Params.Etcd.NodeName == "" {
if config.Params.Etcd.HighAvailability {
// We can't guess the node name in this case so must return an error
return nil, microerror.Maskf(invalidConfigError,
"config.%T must be specified for HA etcd",
config.Params.Etcd.NodeName)
}
config.Params.Etcd.NodeName = etcdNodeName(1, 1)
}
if config.Params.Etcd.InitialCluster == "" {
config.Params.Etcd.InitialCluster = etcdInitialCluster(config.Params.BaseDomain, config.Params.Etcd.HighAvailability)
}
if !strings.Contains(config.Params.Etcd.InitialCluster, fmt.Sprintf("%s=", config.Params.Etcd.NodeName)) {
return nil, microerror.Maskf(invalidConfigError,
"initial cluster, %s, must contain node ID, %s",
config.Params.Etcd.InitialCluster,
config.Params.Etcd.NodeName)
}
if config.Params.DockerhubToken == "" {
return nil, microerror.Maskf(
invalidConfigError,
"config.Params.DockerhubToken must be specified",
)
}
c := &CloudConfig{
config: "",
params: config.Params,
template: config.Template,
}
return c, nil
}
func (c *CloudConfig) ExecuteTemplate() error {
tmpl, err := template.New("cloudconfig").Parse(c.template)
if err != nil {
return microerror.Mask(err)
}
buf := new(bytes.Buffer)
err = tmpl.Execute(buf, c.params)
if err != nil {
return microerror.Mask(err)
}
ignitionJSON, err := ignition.ConvertTemplatetoJSON(buf.Bytes())
if err != nil {
return microerror.Mask(err)
}
c.config = string(ignitionJSON)
return nil
}
func (c *CloudConfig) Base64() string {
cloudConfigBytes := []byte(c.config)
var b bytes.Buffer
w := gzip.NewWriter(&b)
_, err := w.Write(cloudConfigBytes)
if err != nil {
log.Printf("failed to write gzip, reason: %#q", err.Error())
return ""
}
err = w.Close()
if err != nil {
log.Printf("failed to close gzip, reason: %#q", err.Error())
return ""
}
return base64.StdEncoding.EncodeToString(b.Bytes())
}
func (c *CloudConfig) String() string {
return c.config
}
func etcdClusterSize(highAvailability bool) int {
if highAvailability {
return 3
}
return 1
}
func etcdInitialCluster(baseDomain string, highAvailability bool) string {
var cluster string
clusterSize := etcdClusterSize(highAvailability)
for i := 1; i < clusterSize+1; i++ {
id := etcdNodeName(i, clusterSize)
cluster = fmt.Sprintf("%s,%s=https://%s.%s:2380", cluster, id, id, baseDomain)
}
return strings.TrimPrefix(cluster, ",")
}
func etcdNodeName(index int, clusterSize int) string {
if clusterSize == 1 {
return "etcd" // skip suffix for non-HA clusters for backwards compatibility
}
return fmt.Sprintf("etcd%d", index)
}