/usr/share/gocode/src/github.com/ctdk/goiardi/serfin/serfin.go is in golang-github-ctdk-goiardi-dev 0.11.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2013-2017, Jeremy Bingham (<jeremy@goiardi.gl>)
*
* 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 serfin bundles up serf functions for goiardi.
package serfin
import (
"encoding/json"
"fmt"
"os"
"github.com/ctdk/goiardi/config"
serfclient "github.com/hashicorp/serf/client"
"github.com/tideland/golib/logger"
"sync"
"time"
)
// Serfer is the common serf client for goiardi. NB: moving away from doing it
// this way.
var Serfer *serfclient.RPCClient
type serfClientMap struct {
serfs map[string]*serfclient.RPCClient
m sync.Mutex
}
var serfClients *serfClientMap
func init() {
serfClients = new(serfClientMap)
serfClients.serfs = make(map[string]*serfclient.RPCClient)
}
func (scm *serfClientMap) addSerfClient(sc *serfclient.RPCClient, serfAddr string) {
scm.m.Lock()
defer scm.m.Unlock()
scm.serfs[serfAddr] = sc
return
}
func (scm *serfClientMap) closeAllSerfs() {
scm.m.Lock()
defer scm.m.Unlock()
for addr, sc := range scm.serfs {
sc.Close()
delete(scm.serfs, addr)
}
}
func (scm *serfClientMap) closeSerf(serfAddr string) {
scm.m.Lock()
defer scm.m.Unlock()
if sc, ok := scm.serfs[serfAddr]; ok {
sc.Close()
delete(scm.serfs, serfAddr)
}
}
// StartSerfin sets up the serf instance and starts listening for events and
// queries from other serf instances.
func StartSerfin() error {
var err error
Serfer, err = NewRPCClient(config.Config.SerfAddr)
if err != nil {
logger.Criticalf(err.Error())
os.Exit(1)
}
if config.Config.SerfEventAnnounce {
err = Serfer.UserEvent("goiardi-join", []byte(config.Config.Hostname), true)
if err != nil {
logger.Criticalf(err.Error())
os.Exit(1)
}
}
return nil
}
// Query makes a query to the default serf client, reconnecting if it's been
// closed.
func Query(q *serfclient.QueryParam, errch chan<- error) {
var err error
// retry connecting to serf for 5 minutes, every 5 seconds. TODO:
// probably should make this configurable eventually.
retryDelay := time.Duration(5)
retryNum := 60
if Serfer == nil || Serfer.IsClosed() {
serfClients.closeSerf(config.Config.SerfAddr)
var ns *serfclient.RPCClient
for i := 0; i < retryNum; i++ {
logger.Debugf("reconnecting to serf try #%d...", i+1)
ns, err = NewRPCClient(config.Config.SerfAddr)
if err == nil {
Serfer = ns
logger.Debugf("reconnected to serf!")
break
}
logger.Debugf("Failed to reconnect to serf on try #%d, waiting %d seconds", i+1, retryDelay)
time.Sleep(retryDelay * time.Second)
}
// if we got here we never managed to reconnect
qErr := fmt.Errorf("Could not reconnect to serf after %d seconds. Last error: %s", int(retryDelay)*retryNum, err.Error())
errch <- qErr
close(errch)
return
}
err = Serfer.Query(q)
errch <- nil
close(errch)
return
}
func NewRPCClient(serfAddr string) (*serfclient.RPCClient, error) {
sc, err := serfclient.NewRPCClient(serfAddr)
if err != nil {
return nil, err
}
serfClients.addSerfClient(sc, serfAddr)
return sc, nil
}
// CloseAll closes all active serf clients
func CloseAll() {
serfClients.closeAllSerfs()
}
// CloseSerfClient closes one serf client.
func CloseSerfClient(serfAddr string) {
serfClients.closeSerf(serfAddr)
}
// SendEvent sends a serf event out from goiardi.
func SendEvent(eventName string, payload interface{}) {
jsonPayload, err := json.Marshal(payload)
if err != nil {
logger.Errorf(err.Error())
return
}
err = Serfer.UserEvent(eventName, jsonPayload, true)
if err != nil {
logger.Debugf(err.Error())
}
return
}
// SendQuery sends a basic, no frills query out over serf.
func SendQuery(queryName string, payload interface{}) {
jsonPayload, err := json.Marshal(payload)
if err != nil {
logger.Errorf(err.Error())
return
}
q := &serfclient.QueryParam{Name: queryName, Payload: jsonPayload}
err = Serfer.Query(q)
if err != nil {
logger.Debugf(err.Error())
}
return
}
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