func AddSelfToTopology(cm *ConnectionManager, conns map[common.RMId]paxos.Connection, topology *server.Topology, fInc int, active, passive []common.RMId, lc *client.LocalConnection) (*server.Topology, bool, error) {
seg := capn.NewBuffer(nil)
txn := msgs.NewTxn(seg)
txn.SetSubmitter(uint32(cm.RMId))
txn.SetSubmitterBootCount(cm.BootCount)
actions := msgs.NewActionList(seg, 1)
txn.SetActions(actions)
topologyAction := actions.At(0)
topologyAction.SetVarId(server.TopologyVarUUId[:])
topologyAction.SetReadwrite()
rw := topologyAction.Readwrite()
rw.SetVersion(topology.DBVersion[:])
rw.SetValue(topology.Serialize())
if topology.RootVarUUId == nil {
rw.SetReferences(msgs.NewVarIdPosList(seg, 0))
} else {
refs := msgs.NewVarIdPosList(seg, 1)
rw.SetReferences(refs)
varIdPos := refs.At(0)
varIdPos.SetId(topology.RootVarUUId[:])
varIdPos.SetPositions((capn.UInt8List)(*topology.RootPositions))
}
allocs := msgs.NewAllocationList(seg, len(topology.AllRMs))
txn.SetAllocations(allocs)
idx := 0
for listIdx, rmIds := range [][]common.RMId{active, passive} {
for _, rmId := range rmIds {
alloc := allocs.At(idx)
idx++
alloc.SetRmId(uint32(rmId))
if listIdx == 0 {
alloc.SetActive(conns[rmId].BootCount())
} else {
alloc.SetActive(0)
}
indices := seg.NewUInt16List(1)
alloc.SetActionIndices(indices)
indices.Set(0, 0)
}
}
txn.SetFInc(uint8(fInc))
txn.SetTopologyVersion(topology.Version)
result, err := lc.RunTransaction(&txn, true, active...)
if err != nil || result == nil {
return nil, false, err
}
txnId := common.MakeTxnId(result.Txn().Id())
if result.Which() == msgs.OUTCOME_COMMIT {
topology.DBVersion = txnId
server.Log("Topology Txn Committed ok with txnId", topology.DBVersion)
return topology, false, nil
}
abort := result.Abort()
server.Log("Topology Txn Aborted", txnId)
if abort.Which() == msgs.OUTCOMEABORT_RESUBMIT {
return nil, true, nil
}
abortUpdates := abort.Rerun()
if abortUpdates.Len() != 1 {
return nil, false, fmt.Errorf("Internal error: readwrite of topology gave %v updates (1 expected)", abortUpdates.Len())
}
update := abortUpdates.At(0)
dbversion := common.MakeTxnId(update.TxnId())
updateActions := update.Actions()
if updateActions.Len() != 1 && updateActions.Len() != 2 {
return nil, false, fmt.Errorf("Internal error: readwrite of topology gave multiple actions: %v", updateActions.Len())
}
var updateAction *msgs.Action
for idx, l := 0, updateActions.Len(); idx < l; idx++ {
action := updateActions.At(idx)
if bytes.Equal(action.VarId(), server.TopologyVarUUId[:]) {
updateAction = &action
break
}
}
if updateAction == nil {
return nil, false, fmt.Errorf("Internal error: unable to find action for topology from readwrite")
}
if updateAction.Which() != msgs.ACTION_WRITE {
return nil, false, fmt.Errorf("Internal error: readwrite of topology gave non-write action")
}
write := updateAction.Write()
var rootVarPos *msgs.VarIdPos
if refs := write.References(); refs.Len() == 1 {
root := refs.At(0)
rootVarPos = &root
} else if refs.Len() > 1 {
return nil, false, fmt.Errorf("Internal error: readwrite of topology had wrong references: %v", refs.Len())
}
topology, err = server.TopologyDeserialize(dbversion, rootVarPos, write.Value())
if err != nil {
return nil, false, err
}
found := false
for _, rmId := range topology.AllRMs {
if found = rmId == cm.RMId; found {
server.Log("Topology Txn Aborted, but found self in topology.")
return topology, false, nil
}
}
return topology, true, nil
}
