/
helm.go
204 lines (180 loc) · 5.64 KB
/
helm.go
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// package groom is used to add or remove poker room
// in the context of helm deployment with .Values.rooms
package groom
import (
"context"
"errors"
"os"
"github.com/rs/zerolog/log"
"helm.sh/helm/v3/pkg/action"
"helm.sh/helm/v3/pkg/chartutil"
"helm.sh/helm/v3/pkg/cli"
"helm.sh/helm/v3/pkg/release"
"github.com/fc92/poker/internal/common/logger"
)
const (
releaseName = "poker"
roomsValueName = "rooms"
)
var index int
func init() {
logger.InitLogger()
index = 30
}
// get list of deployed rooms
func RoomDeployed() (roomDeployed []interface{}, err error) {
pokerRelease, err := getPokerRelease()
if err != nil || pokerRelease.Config[roomsValueName] == nil {
log.Logger.Err(err).Msg("unable to get rooms out of release for poker")
return []interface{}{}, err
}
rooms := make([]interface{}, 0)
// get rooms
rooms = append(rooms, pokerRelease.Config[roomsValueName].([]interface{})...)
return rooms, nil
}
// check if room named roomName exists
func roomExists(roomName string) (exists bool, err error) {
roomDeployed, err := RoomDeployed()
if err != nil {
return false, err
}
for _, room := range roomDeployed {
roomMap := room.(map[string]interface{})
if roomMap["name"] == roomName {
return true, nil
}
}
return false, nil
}
// get the release used for poker deployment
func getPokerRelease() (pokerRelease *release.Release, err error) {
// get list of Helm chart releases deployed
releases, err := getReleases()
if err != nil {
log.Logger.Err(err).Msg("unable to get helm releases")
return nil, err
}
// identify release for poker
for _, rel := range releases {
log.Logger.Debug().Msgf("found release %s", rel.Name)
if rel.Name == releaseName {
return rel, nil
}
}
return nil, errors.New(releaseName + " release not found")
}
// get helm releases deployed on the namespace
func getReleases() (releases []*release.Release, err error) {
settings := cli.New()
actionConfig := new(action.Configuration)
if err := actionConfig.Init(settings.RESTClientGetter(), settings.Namespace(), os.Getenv("HELM_DRIVER"), log.Printf); err != nil {
return []*release.Release{}, err
}
clientRead := action.NewList(actionConfig)
clientRead.Deployed = true
results, err := clientRead.Run()
if err != nil {
return []*release.Release{}, err
}
return results, nil
}
// add room named roomName
func AddRoom(roomName string) (rooms []string, err error) {
// check if room already exists
exists, err := roomExists(roomName)
if err != nil {
return nil, err
}
if exists {
log.Logger.Err(err).Msgf("room %v already exists", roomName)
return rooms, errors.New("Room named " + roomName + " already exists. No change applied.")
}
log.Logger.Info().Msgf("Adding room %v", roomName)
result, err2 := updateRoom(roomName, true)
if err2 != nil {
log.Logger.Err(err2).Msgf("Error adding room %v", roomName)
return nil, err2
}
return result, nil
}
// remove room named roomName
func RemoveRoom(roomName string) {
// check if room already exists
exists, err := roomExists(roomName)
if err != nil {
log.Logger.Err(err).Msgf("checking room %s exists failed with error %v", roomName, err)
}
if exists {
log.Logger.Info().Msgf("Removing room %v", roomName)
_, err = updateRoom(roomName, false)
if err != nil {
log.Logger.Err(err).Msgf("removal of room %s failed with error %v", roomName, err)
}
}
log.Logger.Err(err).Msgf("removal of room %s failed", roomName)
}
// add or remove room based on isAdd value
func updateRoom(roomName string, isAdd bool) (rooms []string, err error) {
pokerRelease, err := getPokerRelease()
if err != nil {
return nil, err
}
settings := cli.New()
cfg := new(action.Configuration)
if err := cfg.Init(settings.RESTClientGetter(), settings.Namespace(), os.Getenv("HELM_DRIVER"), log.Printf); err != nil {
log.Logger.Err(err).Msg("unable to init helm client for upgrade")
return nil, err
}
if err = cfg.KubeClient.IsReachable(); err != nil {
log.Logger.Err(err).Msg("unable to connect to the kubernetes cluster with helm client for upgrade")
return nil, err
}
client := action.NewUpgrade(cfg)
client.ReuseValues = true
client.Namespace = settings.Namespace()
if err := chartutil.ValidateReleaseName(releaseName); err != nil {
log.Logger.Err(err).Msg("unable to validate release name with helm client for upgrade")
return nil, err
}
ctx := context.Background()
newValues := prepareValues(pokerRelease, isAdd, roomName)
log.Logger.Info().Msgf("Values target is: %v", newValues)
// apply changes on kubernetes namespace
if _, err := client.RunWithContext(ctx, releaseName, pokerRelease.Chart, newValues); err != nil {
log.Logger.Err(err).Msg("helm client for upgrade FAILED to apply release update")
return nil, err
}
for _, room := range newValues[roomsValueName].([]interface{}) {
roomMap := room.(map[string]interface{})
rooms = append(rooms, roomMap["name"].(string))
}
return rooms, nil
}
func prepareValues(pokerRelease *release.Release, isAdd bool, roomName string) map[string]interface{} {
newValues := make(map[string]interface{})
for k, v := range pokerRelease.Config {
newValues[k] = v
if k == roomsValueName {
// add roomName
if isAdd {
newRoom := make(map[string]interface{})
index++
newRoom["name"] = roomName
newRoom["index"] = index
newValues[k] = append(newValues[k].([]interface{}), newRoom)
} else {
// delete roomName
newValues[k] = []interface{}{} // remove all rooms
for _, room := range v.([]interface{}) {
roomMap := room.(map[string]interface{})
// re-add other rooms only
if roomMap["name"] != roomName {
newValues[k] = append(newValues[k].([]interface{}), room)
}
}
}
}
}
return newValues
}