// ensureServiceTxn is used to upsert a service registration within an
// existing memdb transaction.
func (s *StateStore) ensureServiceTxn(tx *memdb.Txn, idx uint64, watches *DumbWatchManager,
node string, svc *structs.NodeService) error {
// Check for existing service
existing, err := tx.First("services", "id", node, svc.ID)
if err != nil {
return fmt.Errorf("failed service lookup: %s", err)
}
// Create the service node entry and populate the indexes. Note that
// conversion doesn't populate any of the node-specific information
// (Address and TaggedAddresses). That's always populated when we read
// from the state store.
entry := svc.ToServiceNode(node)
if existing != nil {
entry.CreateIndex = existing.(*structs.ServiceNode).CreateIndex
entry.ModifyIndex = idx
} else {
entry.CreateIndex = idx
entry.ModifyIndex = idx
}
// Get the node
n, err := tx.First("nodes", "id", node)
if err != nil {
return fmt.Errorf("failed node lookup: %s", err)
}
if n == nil {
return ErrMissingNode
}
// Insert the service and update the index
if err := tx.Insert("services", entry); err != nil {
return fmt.Errorf("failed inserting service: %s", err)
}
if err := tx.Insert("index", &IndexEntry{"services", idx}); err != nil {
return fmt.Errorf("failed updating index: %s", err)
}
watches.Arm("services")
return nil
}
