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/
etcd.go
98 lines (86 loc) · 2.15 KB
/
etcd.go
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package etcd
import (
"encoding/json"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/coreos/etcd/client"
"github.com/logicmonitor/k8s-argus/pkg/constants"
"github.com/logicmonitor/k8s-argus/pkg/types"
log "github.com/sirupsen/logrus"
)
// Controller is the etcd controller for discovering etcd nodes.
type Controller struct {
types.DeviceManager
}
// Member is a discovered etcd member.
type Member struct {
Name string
URL *url.URL
}
// DiscoverByToken discovers the etcd node IP addresses using the etcd discovery service.
func (c *Controller) DiscoverByToken() ([]*Member, error) {
members := []*Member{}
response, err := http.Get(c.Config().EtcdDiscoveryToken)
if err != nil {
return nil, err
}
n := client.Response{}
buf, err := ioutil.ReadAll(response.Body)
if err != nil {
return nil, err
}
err = json.Unmarshal(buf, &n)
if err != nil {
return nil, err
}
log.Infof("Discovered %d etcd members", len(n.Node.Nodes))
for _, member := range n.Node.Nodes {
s := strings.Split(member.Value, "=")
if len(s) == 2 {
u, err := url.Parse(s[1])
if err != nil {
return nil, err
}
m := &Member{
Name: s[0],
URL: u,
}
members = append(members, m)
c.addDevice(m)
}
}
return members, nil
}
func (c *Controller) addDevice(member *Member) {
// Check if the etcd member has already been added.
d, err := c.FindByDisplayName(fmtMemberDisplayName(member))
if err != nil {
log.Errorf("Failed to find etcd member %q: %v", member.Name, err)
return
}
if d != nil {
return
}
// Add the etcd member.
if _, err := c.Add(
c.args(member, constants.EtcdCategory)...,
); err != nil {
log.Errorf("Failed to add etcd member %q: %v", member.URL.Hostname(), err)
return
}
log.Infof("Added etcd member %q", member.Name)
}
// nolint: unparam
func (c *Controller) args(member *Member, category string) []types.DeviceOption {
return []types.DeviceOption{
c.Name(member.URL.Hostname()),
c.DisplayName(fmtMemberDisplayName(member)),
c.SystemCategories(category),
c.Auto("clientport", member.URL.Port()),
}
}
func fmtMemberDisplayName(member *Member) string {
return member.Name + "-" + member.URL.Hostname()
}