func (a *Allocator) commitAllocatedNetwork(ctx context.Context, batch *store.Batch, n *api.Network) error {
	if err := batch.Update(func(tx store.Tx) error {
		if err := store.UpdateNetwork(tx, n); err != nil {
			return errors.Wrapf(err, "failed updating state in store transaction for network %s", n.ID)
		}
		return nil
	}); err != nil {
		if err := a.netCtx.nwkAllocator.Deallocate(n); err != nil {
			log.G(ctx).WithError(err).Errorf("failed rolling back allocation of network %s", n.ID)
		}

		return err
	}

	return nil
}

func (a *Allocator) allocateNetwork(ctx context.Context, nc *networkContext, n *api.Network) error {
	if err := nc.nwkAllocator.Allocate(n); err != nil {
		return fmt.Errorf("failed during network allocation for network %s: %v", n.ID, err)
	}

	if err := a.store.Update(func(tx store.Tx) error {
		if err := store.UpdateNetwork(tx, n); err != nil {
			return fmt.Errorf("failed updating state in store transaction for network %s: %v", n.ID, err)
		}
		return nil
	}); err != nil {
		if err := nc.nwkAllocator.Deallocate(n); err != nil {
			log.G(ctx).WithError(err).Errorf("failed rolling back allocation of network %s", n.ID)
		}

		return err
	}

	return nil
}

func (a *Allocator) allocateNetwork(ctx context.Context, n *api.Network) error {
	nc := a.netCtx

	if err := nc.nwkAllocator.Allocate(n); err != nil {
		nc.unallocatedNetworks[n.ID] = n
		return errors.Wrapf(err, "failed during network allocation for network %s", n.ID)
	}

	if err := a.store.Update(func(tx store.Tx) error {
		if err := store.UpdateNetwork(tx, n); err != nil {
			return errors.Wrapf(err, "failed updating state in store transaction for network %s", n.ID)
		}
		return nil
	}); err != nil {
		if err := nc.nwkAllocator.Deallocate(n); err != nil {
			log.G(ctx).WithError(err).Errorf("failed rolling back allocation of network %s", n.ID)
		}

		return err
	}

	return nil
}

func (a *Allocator) doNetworkInit(ctx context.Context) error {
	na, err := networkallocator.New()
	if err != nil {
		return err
	}

	nc := &networkContext{
		nwkAllocator:        na,
		unallocatedTasks:    make(map[string]*api.Task),
		unallocatedServices: make(map[string]*api.Service),
		unallocatedNetworks: make(map[string]*api.Network),
		ingressNetwork:      newIngressNetwork(),
	}

	// Check if we have the ingress network. If not found create
	// it before reading all network objects for allocation.
	var networks []*api.Network
	a.store.View(func(tx store.ReadTx) {
		networks, err = store.FindNetworks(tx, store.ByName(ingressNetworkName))
		if len(networks) > 0 {
			nc.ingressNetwork = networks[0]
		}
	})
	if err != nil {
		return fmt.Errorf("failed to find ingress network during init: %v", err)
	}

	// If ingress network is not found, create one right away
	// using the predefined template.
	if len(networks) == 0 {
		if err := a.store.Update(func(tx store.Tx) error {
			nc.ingressNetwork.ID = identity.NewID()
			if err := store.CreateNetwork(tx, nc.ingressNetwork); err != nil {
				return err
			}

			return nil
		}); err != nil {
			return fmt.Errorf("failed to create ingress network: %v", err)
		}

		a.store.View(func(tx store.ReadTx) {
			networks, err = store.FindNetworks(tx, store.ByName(ingressNetworkName))
			if len(networks) > 0 {
				nc.ingressNetwork = networks[0]
			}
		})
		if err != nil {
			return fmt.Errorf("failed to find ingress network after creating it: %v", err)
		}

	}

	// Try to complete ingress network allocation before anything else so
	// that the we can get the preferred subnet for ingress
	// network.
	if !na.IsAllocated(nc.ingressNetwork) {
		if err := a.allocateNetwork(ctx, nc, nc.ingressNetwork); err != nil {
			log.G(ctx).Errorf("failed allocating ingress network during init: %v", err)
		}

		// Update store after allocation
		if err := a.store.Update(func(tx store.Tx) error {
			if err := store.UpdateNetwork(tx, nc.ingressNetwork); err != nil {
				return err
			}

			return nil
		}); err != nil {
			return fmt.Errorf("failed to create ingress network: %v", err)
		}
	}

	// Allocate networks in the store so far before we started
	// watching.
	a.store.View(func(tx store.ReadTx) {
		networks, err = store.FindNetworks(tx, store.All)
	})
	if err != nil {
		return fmt.Errorf("error listing all networks in store while trying to allocate during init: %v", err)
	}

	for _, n := range networks {
		if na.IsAllocated(n) {
			continue
		}

		if err := a.allocateNetwork(ctx, nc, n); err != nil {
			log.G(ctx).Errorf("failed allocating network %s during init: %v", n.ID, err)
		}
	}

	// Allocate nodes in the store so far before we process watched events.
	var nodes []*api.Node
	a.store.View(func(tx store.ReadTx) {
		nodes, err = store.FindNodes(tx, store.All)
	})
	if err != nil {
		return fmt.Errorf("error listing all services in store while trying to allocate during init: %v", err)
	}
//.........这里部分代码省略.........