func (s *Sentinel) Start() {
endCh := make(chan struct{})
endApiCh := make(chan error)
router := s.NewRouter()
go func() {
endApiCh <- http.ListenAndServe(fmt.Sprintf("%s:%s", s.listenAddress, s.port), router)
}()
ctx, cancel := context.WithCancel(context.Background())
timerCh := time.NewTimer(0).C
for true {
select {
case <-s.stop:
log.Debugf("stopping stolon sentinel")
cancel()
s.end <- true
return
case <-timerCh:
go func() {
s.clusterSentinelCheck(ctx)
endCh <- struct{}{}
}()
case <-endCh:
timerCh = time.NewTimer(s.clusterConfig.SleepInterval).C
case err := <-endApiCh:
if err != nil {
log.Fatal("ListenAndServe: ", err)
}
close(s.stop)
}
}
}
func (p *PostgresKeeper) Start() {
endSMCh := make(chan struct{})
endPgStatecheckerCh := make(chan struct{})
endApiCh := make(chan error)
err := p.loadCVVersion()
if err != nil {
p.end <- err
return
}
p.pgm.Stop(true)
http.HandleFunc("/info", p.infoHandler)
http.HandleFunc("/pgstate", p.pgStateHandler)
go func() {
endApiCh <- http.ListenAndServe(fmt.Sprintf("%s:%s", p.listenAddress, p.port), nil)
}()
ctx, cancel := context.WithCancel(context.Background())
smTimerCh := time.NewTimer(0).C
updatePGStateTimerCh := time.NewTimer(0).C
for true {
select {
case <-p.stop:
log.Debugf("stopping postgres keeper")
cancel()
p.pgm.Stop(true)
p.end <- nil
return
case <-smTimerCh:
go func() {
p.postgresKeeperSM(ctx)
endSMCh <- struct{}{}
}()
case <-endSMCh:
smTimerCh = time.NewTimer(p.clusterConfig.SleepInterval).C
case <-updatePGStateTimerCh:
go func() {
p.updatePGState(ctx)
endPgStatecheckerCh <- struct{}{}
}()
case <-endPgStatecheckerCh:
updatePGStateTimerCh = time.NewTimer(p.clusterConfig.SleepInterval).C
case err := <-endApiCh:
if err != nil {
log.Fatal("ListenAndServe: ", err)
}
close(p.stop)
}
}
}
func (s *Sentinel) Start() {
endCh := make(chan struct{})
ctx, cancel := context.WithCancel(context.Background())
timerCh := time.NewTimer(0).C
for true {
select {
case <-s.stop:
log.Debugf("stopping postgres keeper")
cancel()
s.end <- true
return
case <-timerCh:
go func() {
s.clusterSentinelSM(ctx)
endCh <- struct{}{}
}()
case <-endCh:
timerCh = time.NewTimer(s.clusterConfig.SleepInterval).C
}
}
}
func (p *PostgresKeeper) Start() {
endSMCh := make(chan struct{})
endPgStatecheckerCh := make(chan struct{})
endApiCh := make(chan error)
var err error
var cd *cluster.ClusterData
// TODO(sgotti) make the postgres manager stateless and instantiate a
// new one at every check loop, this will avoid the need to loop here
// to get the clusterconfig
for {
cd, _, err = p.e.GetClusterData()
if err == nil {
break
}
log.Errorf("error retrieving cluster data: %v", err)
time.Sleep(cluster.DefaultSleepInterval)
}
var cv *cluster.ClusterView
if cd == nil {
cv = cluster.NewClusterView()
} else {
cv = cd.ClusterView
}
log.Debugf(spew.Sprintf("clusterView: %#v", cv))
p.clusterConfig = cv.Config.ToConfig()
log.Debugf(spew.Sprintf("clusterConfig: %#v", p.clusterConfig))
if err := p.loadCVVersion(); err != nil {
p.end <- fmt.Errorf("failed to load cluster version file: %v", err)
return
}
// TODO(sgotti) reconfigure the various configurations options (PGRepl*
// and RequestTimeout) after a changed cluster config
followersIDs := cv.GetFollowersIDs(p.id)
pgParameters := p.createPGParameters(followersIDs)
pgm := postgresql.NewManager(p.id, cfg.pgBinPath, cfg.dataDir, cfg.pgConfDir, pgParameters, p.getOurConnString(), p.getOurReplConnString(), p.clusterConfig.PGReplUser, p.clusterConfig.PGReplPassword, p.clusterConfig.RequestTimeout)
p.pgm = pgm
p.pgm.Stop(true)
http.HandleFunc("/info", p.infoHandler)
http.HandleFunc("/pgstate", p.pgStateHandler)
go func() {
endApiCh <- http.ListenAndServe(fmt.Sprintf("%s:%s", p.listenAddress, p.port), nil)
}()
ctx, cancel := context.WithCancel(context.Background())
smTimerCh := time.NewTimer(0).C
updatePGStateTimerCh := time.NewTimer(0).C
for true {
select {
case <-p.stop:
log.Debugf("stopping stolon keeper")
cancel()
p.pgm.Stop(true)
p.end <- nil
return
case <-smTimerCh:
go func() {
p.postgresKeeperSM(ctx)
endSMCh <- struct{}{}
}()
case <-endSMCh:
smTimerCh = time.NewTimer(p.clusterConfig.SleepInterval).C
case <-updatePGStateTimerCh:
go func() {
p.updatePGState(ctx)
endPgStatecheckerCh <- struct{}{}
}()
case <-endPgStatecheckerCh:
updatePGStateTimerCh = time.NewTimer(p.clusterConfig.SleepInterval).C
case err := <-endApiCh:
if err != nil {
log.Fatal("ListenAndServe: ", err)
}
close(p.stop)
}
}
}
func (c *simpleHTTPClient) Do(ctx context.Context, act httpAction) (*http.Response, []byte, error) {
req := act.HTTPRequest(c.endpoint)
if err := printcURL(req); err != nil {
return nil, nil, err
}
var hctx context.Context
var hcancel context.CancelFunc
if c.headerTimeout > 0 {
hctx, hcancel = context.WithTimeout(ctx, c.headerTimeout)
} else {
hctx, hcancel = context.WithCancel(ctx)
}
defer hcancel()
reqcancel := requestCanceler(c.transport, req)
rtchan := make(chan roundTripResponse, 1)
go func() {
resp, err := c.transport.RoundTrip(req)
rtchan <- roundTripResponse{resp: resp, err: err}
close(rtchan)
}()
var resp *http.Response
var err error
select {
case rtresp := <-rtchan:
resp, err = rtresp.resp, rtresp.err
case <-hctx.Done():
// cancel and wait for request to actually exit before continuing
reqcancel()
rtresp := <-rtchan
resp = rtresp.resp
switch {
case ctx.Err() != nil:
err = ctx.Err()
case hctx.Err() != nil:
err = fmt.Errorf("client: endpoint %s exceeded header timeout", c.endpoint.String())
default:
panic("failed to get error from context")
}
}
// always check for resp nil-ness to deal with possible
// race conditions between channels above
defer func() {
if resp != nil {
resp.Body.Close()
}
}()
if err != nil {
return nil, nil, err
}
var body []byte
done := make(chan struct{})
go func() {
body, err = ioutil.ReadAll(resp.Body)
done <- struct{}{}
}()
select {
case <-ctx.Done():
resp.Body.Close()
<-done
return nil, nil, ctx.Err()
case <-done:
}
return resp, body, err
}