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buddy.go
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buddy.go
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"strings"
"time"
"github.com/GoogleCloudPlatform/heapster/sources/api"
fleetClient "github.com/coreos/fleet/client"
"github.com/coreos/fleet/etcd"
fleetPkg "github.com/coreos/fleet/pkg"
"github.com/coreos/fleet/registry"
"github.com/golang/glog"
)
var argEndpoints = flag.String("endpoints", "http://127.0.0.1:4001", "Comma separated list of fleet server endpoints")
// While updating this, also update deploy/docker/Dockerfile.
var hostsFile = flag.String("external_hosts_file", "/var/run/heapster/hosts", "A file that heapster refers to get a list of nodes to monitor.")
func getFleetRegistryClient() (fleetClient.API, error) {
var dial func(string, string) (net.Conn, error)
tlsConfig, err := fleetPkg.ReadTLSConfigFiles("", "", "")
if err != nil {
return nil, err
}
trans := &http.Transport{
Dial: dial,
TLSClientConfig: tlsConfig,
}
timeout := 3 * 1000 * time.Millisecond
machines := strings.Split(*argEndpoints, ",")
eClient, err := etcd.NewClient(machines, trans, timeout)
if err != nil {
return nil, err
}
reg := registry.NewEtcdRegistry(eClient, "/_coreos.com/fleet/")
return &fleetClient.RegistryClient{Registry: reg}, nil
}
func getMachines(client fleetClient.API, outMachines map[string]string) error {
machines, err := client.Machines()
if err != nil {
return err
}
for _, machine := range machines {
outMachines[machine.ID] = machine.PublicIP
}
return nil
}
func updateHeapsterHostsFile(hosts map[string]string) error {
nodeList := &api.ExternalNodeList{}
for hostname, ip := range hosts {
nodeList.Items = append(nodeList.Items, api.ExternalNode{Name: hostname, IP: ip})
}
data, err := json.Marshal(nodeList)
if err != nil {
return err
}
glog.V(1).Infof("writing %s to hosts file\n", string(data))
if err := ioutil.WriteFile(*hostsFile, data, 0755); err != nil {
return err
}
return nil
}
func doWork(client fleetClient.API) error {
machines := make(map[string]string)
err := getMachines(client, machines)
if err != nil {
return err
}
return updateHeapsterHostsFile(machines)
}
func validateHostsFile() error {
if *hostsFile == "" {
return fmt.Errorf("external hosts file is invalid")
}
_, err := os.Stat(*hostsFile)
if err != nil {
return fmt.Errorf("cannot stat file %q: %s", *hostsFile, err)
}
return nil
}
func main() {
flag.Parse()
if err := validateHostsFile(); err != nil {
glog.Fatal(err)
}
client, err := getFleetRegistryClient()
if err != nil {
glog.Fatal(err)
}
ticker := time.NewTicker(10 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
err = doWork(client)
if err != nil {
glog.Fatal(err)
}
}
}
}