forked from rancher/rancher-metadata
/
subscribe.go
157 lines (135 loc) · 3.2 KB
/
subscribe.go
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package main
import (
"io"
"net/http"
"os"
"time"
"github.com/Sirupsen/logrus"
"github.com/mitchellh/mapstructure"
revents "github.com/rancher/event-subscriber/events"
"github.com/rancher/go-rancher/v2"
"github.com/rancher/rancher-metadata/pkg/kicker"
)
type ReloadFunc func(file string) (Versions, error)
type Subscriber struct {
url string
accessKey string
secretKey string
reload ReloadFunc
answerFile string
client *http.Client
kicker *kicker.Kicker
}
func NewSubscriber(url, accessKey, secretKey, answerFile string, reload ReloadFunc) *Subscriber {
s := &Subscriber{
url: url,
accessKey: accessKey,
secretKey: secretKey,
reload: reload,
answerFile: answerFile,
client: &http.Client{},
}
s.kicker = kicker.New(func() {
if err := s.downloadAndReload(); err != nil {
logrus.Errorf("Failed to download and reload metadata: %v", err)
}
})
return s
}
func (s *Subscriber) Subscribe() error {
handlers := map[string]revents.EventHandler{
"ping": s.noOp,
"config.update": s.configUpdate,
}
router, err := revents.NewEventRouter("", 0, s.url, s.accessKey, s.secretKey, nil, handlers, "", 3, revents.DefaultPingConfig)
if err != nil {
return err
}
go func() {
for {
sp := revents.SkippingWorkerPool(3, nil)
if err := router.RunWithWorkerPool(sp); err != nil {
logrus.Errorf("Exiting subscriber: %v", err)
}
time.Sleep(time.Second)
}
}()
return nil
}
func (s *Subscriber) noOp(event *revents.Event, c *client.RancherClient) error {
return nil
}
func (s *Subscriber) configUpdate(event *revents.Event, c *client.RancherClient) error {
update := ConfigUpdateData{}
if err := mapstructure.Decode(event.Data, &update); err != nil {
return err
}
found := false
for _, item := range update.Items {
if found = item.Name == "metadata-answers"; found {
s.kicker.Kick()
break
}
}
_, err := c.Publish.Create(&client.Publish{
Name: event.ReplyTo,
PreviousIds: []string{event.ID},
})
return err
}
func (s *Subscriber) downloadAndReload() error {
url := s.url + "/configcontent/metadata-answers"
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return err
}
req.SetBasicAuth(s.accessKey, s.secretKey)
resp, err := s.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
tempFile := s.answerFile + ".temp"
out, err := os.Create(tempFile)
if err != nil {
return err
}
defer func() {
out.Close()
os.Remove(tempFile)
}()
_, err = io.Copy(out, resp.Body)
if err != nil {
return err
}
versions, err := s.reload(tempFile)
if err != nil {
return err
}
os.Rename(tempFile, s.answerFile)
def, ok := versions["latest"]["default"].(map[string]interface{})
if ok {
version, _ := def["version"].(string)
logrus.Infof("Applied %s", url+"?version="+version)
req, err := http.NewRequest("PUT", url+"?version="+version, nil)
if err != nil {
return err
}
req.SetBasicAuth(s.accessKey, s.secretKey)
resp, err := s.client.Do(req)
if err != nil {
return err
}
if resp.Body != nil {
resp.Body.Close()
}
}
return err
}
type ConfigUpdateData struct {
ConfigUrl string
Items []ConfigUpdateItem
}
type ConfigUpdateItem struct {
Name string
}