func (ar *ActionRepository) ApplyTabletAction(actionName string, tabletAlias topo.TabletAlias, r *http.Request) *ActionResult {
result := &ActionResult{Name: actionName, Parameters: tabletAlias.String()}
action, ok := ar.tabletActions[actionName]
if !ok {
result.error("Unknown tablet action")
return result
}
// check the role
if action.role != "" {
if err := acl.CheckAccessHTTP(r, action.role); err != nil {
result.error("Access denied")
return result
}
}
// run the action
wr := wrangler.New(logutil.NewConsoleLogger(), ar.ts, *actionTimeout, *lockTimeout)
output, err := action.method(wr, tabletAlias, r)
if err != nil {
result.error(err.Error())
return result
}
result.Output = output
return result
}
// RecordTabletTagAction records a new TabletTagAction
// into the specified Cleaner
func RecordTabletTagAction(cleaner *Cleaner, tabletAlias topo.TabletAlias, name, value string) {
cleaner.Record(TabletTagActionName, tabletAlias.String(), &TabletTagAction{
TabletAlias: tabletAlias,
Name: name,
Value: value,
})
}
// FindChangeSlaveTypeActionByTarget finds the first action for the target
func FindChangeSlaveTypeActionByTarget(cleaner *Cleaner, tabletAlias topo.TabletAlias) (*ChangeSlaveTypeAction, error) {
action, err := cleaner.GetActionByName(ChangeSlaveTypeActionName, tabletAlias.String())
if err != nil {
return nil, err
}
result, ok := action.(*ChangeSlaveTypeAction)
if !ok {
return nil, fmt.Errorf("Action with wrong type: %v", action)
}
return result, nil
}
// helper method to asynchronously diff a permissions
func (wr *Wrangler) diffPermissions(masterPermissions *myproto.Permissions, masterAlias topo.TabletAlias, alias topo.TabletAlias, wg *sync.WaitGroup, er concurrency.ErrorRecorder) {
defer wg.Done()
log.Infof("Gathering permissions for %v", alias)
slavePermissions, err := wr.GetPermissions(alias)
if err != nil {
er.RecordError(err)
return
}
log.Infof("Diffing permissions for %v", alias)
myproto.DiffPermissions(masterAlias.String(), masterPermissions, alias.String(), slavePermissions, er)
}
// helper method to asynchronously diff a schema
func (wr *Wrangler) diffSchema(masterSchema *myproto.SchemaDefinition, masterTabletAlias, alias topo.TabletAlias, excludeTables []string, includeViews bool, wg *sync.WaitGroup, er concurrency.ErrorRecorder) {
defer wg.Done()
log.Infof("Gathering schema for %v", alias)
slaveSchema, err := wr.GetSchema(alias, nil, excludeTables, includeViews)
if err != nil {
er.RecordError(err)
return
}
log.Infof("Diffing schema for %v", alias)
myproto.DiffSchema(masterTabletAlias.String(), masterSchema, alias.String(), slaveSchema, er)
}
func (ex ZkExplorer) GetTabletPath(alias topo.TabletAlias) string {
return path.Join("/zk", alias.Cell, "vt/tablets", alias.TabletUidStr())
}
// RecordChangeSlaveTypeAction records a new ChangeSlaveTypeAction
// into the specified Cleaner
func RecordChangeSlaveTypeAction(cleaner *Cleaner, tabletAlias topo.TabletAlias, tabletType topo.TabletType) {
cleaner.Record(ChangeSlaveTypeActionName, tabletAlias.String(), &ChangeSlaveTypeAction{
TabletAlias: tabletAlias,
TabletType: tabletType,
})
}
// ConfigureTabletHook configures the right parameters for a hook
// running locally on a tablet.
func ConfigureTabletHook(hk *hook.Hook, tabletAlias topo.TabletAlias) {
if hk.ExtraEnv == nil {
hk.ExtraEnv = make(map[string]string, 1)
}
hk.ExtraEnv["TABLET_ALIAS"] = tabletAlias.String()
}
func (wr *Wrangler) applySchemaShardComplex(statusArray []*TabletStatus, shardInfo *topo.ShardInfo, preflight *myproto.SchemaChangeResult, masterTabletAlias topo.TabletAlias, change string, newParentTabletAlias topo.TabletAlias, force bool) (*myproto.SchemaChangeResult, error) {
// apply the schema change to all replica / slave tablets
for _, status := range statusArray {
// if already applied, we skip this guy
diffs := myproto.DiffSchemaToArray("after", preflight.AfterSchema, status.ti.Alias.String(), status.beforeSchema)
if len(diffs) == 0 {
log.Infof("Tablet %v already has the AfterSchema, skipping", status.ti.Alias)
continue
}
// make sure the before schema matches
diffs = myproto.DiffSchemaToArray("master", preflight.BeforeSchema, status.ti.Alias.String(), status.beforeSchema)
if len(diffs) > 0 {
if force {
log.Warningf("Tablet %v has inconsistent schema, ignoring: %v", status.ti.Alias, strings.Join(diffs, "\n"))
} else {
return nil, fmt.Errorf("Tablet %v has inconsistent schema: %v", status.ti.Alias, strings.Join(diffs, "\n"))
}
}
// take this guy out of the serving graph if necessary
ti, err := wr.ts.GetTablet(status.ti.Alias)
if err != nil {
return nil, err
}
typeChangeRequired := ti.Tablet.IsInServingGraph()
if typeChangeRequired {
// note we want to update the serving graph there
err = wr.changeTypeInternal(ti.Alias, topo.TYPE_SCHEMA_UPGRADE)
if err != nil {
return nil, err
}
}
// apply the schema change
log.Infof("Applying schema change to slave %v in complex mode", status.ti.Alias)
sc := &myproto.SchemaChange{Sql: change, Force: force, AllowReplication: false, BeforeSchema: preflight.BeforeSchema, AfterSchema: preflight.AfterSchema}
_, err = wr.ApplySchema(status.ti.Alias, sc)
if err != nil {
return nil, err
}
// put this guy back into the serving graph
if typeChangeRequired {
err = wr.changeTypeInternal(ti.Alias, ti.Tablet.Type)
if err != nil {
return nil, err
}
}
}
// if newParentTabletAlias is passed in, use that as the new master
if !newParentTabletAlias.IsZero() {
log.Infof("Reparenting with new master set to %v", newParentTabletAlias)
tabletMap, err := topo.GetTabletMapForShard(context.TODO(), wr.ts, shardInfo.Keyspace(), shardInfo.ShardName())
if err != nil {
return nil, err
}
slaveTabletMap, masterTabletMap := topotools.SortedTabletMap(tabletMap)
newMasterTablet, err := wr.ts.GetTablet(newParentTabletAlias)
if err != nil {
return nil, err
}
// Create reusable Reparent event with available info
ev := &events.Reparent{
ShardInfo: *shardInfo,
NewMaster: *newMasterTablet.Tablet,
}
if oldMasterTablet, ok := tabletMap[shardInfo.MasterAlias]; ok {
ev.OldMaster = *oldMasterTablet.Tablet
}
err = wr.reparentShardGraceful(ev, shardInfo, slaveTabletMap, masterTabletMap, newMasterTablet /*leaveMasterReadOnly*/, false)
if err != nil {
return nil, err
}
// Here we would apply the schema change to the old
// master, but after a reparent it's in Scrap state,
// so no need to. When/if reparent leaves the
// original master in a different state (like replica
// or rdonly), then we should apply the schema there
// too.
log.Infof("Skipping schema change on old master %v in complex mode, it's been Scrapped", masterTabletAlias)
}
return &myproto.SchemaChangeResult{BeforeSchema: preflight.BeforeSchema, AfterSchema: preflight.AfterSchema}, nil
}
func TabletActionPathForAlias(alias topo.TabletAlias) string {
return fmt.Sprintf("/zk/%v/vt/tablets/%v/action", alias.Cell, alias.TabletUidStr())
}
