func newRealtimeStats(ts topo.Server) (*realtimeStats, error) {
hc := discovery.NewHealthCheck(*vtctl.HealthCheckTimeout, *vtctl.HealthcheckRetryDelay, *vtctl.HealthCheckTimeout)
tabletStatsCache := &tabletStatsCache{
statuses: make(map[string]map[string]*discovery.TabletStats),
}
hc.SetListener(tabletStatsCache)
r := &realtimeStats{
healthCheck: hc,
tabletStats: tabletStatsCache,
}
// Get the list of all tablets from all cells and monitor the topology for added or removed tablets with a CellTabletsWatcher.
cells, err := ts.GetKnownCells(context.Background())
if err != nil {
return r, fmt.Errorf("error when getting cells: %v", err)
}
var watchers []*discovery.TopologyWatcher
for _, cell := range cells {
watcher := discovery.NewCellTabletsWatcher(ts, hc, cell, *vtctl.HealthCheckTopologyRefresh, discovery.DefaultTopoReadConcurrency)
watchers = append(watchers, watcher)
}
r.cellWatchers = watchers
return r, nil
}
func createDiscoveryGateway(hc discovery.HealthCheck, topoServer topo.Server, serv topo.SrvTopoServer, cell string, retryCount int, tabletTypesToWait []topodatapb.TabletType) Gateway {
dg := &discoveryGateway{
hc: hc,
topoServer: topoServer,
srvTopoServer: serv,
localCell: cell,
retryCount: retryCount,
tabletTypesToWait: tabletTypesToWait,
tabletsWatchers: make([]*discovery.TopologyWatcher, 0, 1),
statusAggregators: make(map[string]*TabletStatusAggregator),
}
log.Infof("loading tablets for cells: %v", *cellsToWatch)
for _, c := range strings.Split(*cellsToWatch, ",") {
if c == "" {
continue
}
ctw := discovery.NewCellTabletsWatcher(dg.topoServer, dg.hc, c, *refreshInterval, *topoReadConcurrency)
dg.tabletsWatchers = append(dg.tabletsWatchers, ctw)
}
err := dg.waitForTablets()
if err != nil {
log.Errorf("createDiscoveryGateway: %v", err)
}
return dg
}
func createDiscoveryGateway(hc discovery.HealthCheck, topoServer topo.Server, serv topo.SrvTopoServer, cell string, retryCount int) Gateway {
dg := &discoveryGateway{
hc: hc,
tsc: discovery.NewTabletStatsCache(hc, cell),
topoServer: topoServer,
srvTopoServer: serv,
localCell: cell,
retryCount: retryCount,
tabletsWatchers: make([]*discovery.TopologyWatcher, 0, 1),
statusAggregators: make(map[string]*TabletStatusAggregator),
}
log.Infof("loading tablets for cells: %v", *cellsToWatch)
for _, c := range strings.Split(*cellsToWatch, ",") {
if c == "" {
continue
}
var tr discovery.TabletRecorder = dg.hc
if len(tabletFilters) > 0 {
fbs, err := discovery.NewFilterByShard(dg.hc, tabletFilters)
if err != nil {
log.Fatalf("Cannot parse tablet_filters parameter: %v", err)
}
tr = fbs
}
ctw := discovery.NewCellTabletsWatcher(dg.topoServer, tr, c, *refreshInterval, *topoReadConcurrency)
dg.tabletsWatchers = append(dg.tabletsWatchers, ctw)
}
return dg
}
// InitializeConnections creates connections to VTTablets.
func (dg *discoveryGateway) InitializeConnections(ctx context.Context) error {
dg.hc.SetListener(dg)
for _, cell := range strings.Split(*cellsToWatch, ",") {
ctw := discovery.NewCellTabletsWatcher(dg.topoServer, dg.hc, cell, *refreshInterval, *topoReadConcurrency)
dg.tabletsWatchers = append(dg.tabletsWatchers, ctw)
}
return nil
}