implement ippool

1. support vlan ippool management
2. support calico ippool management

Signed-off-by: Duan Jiong <djduanjiong@gmail.com>

pkg/simple/client/network/ippool/provider.go

@@ -0,0 +1,98 @@
+/*
+Copyright 2020 The KubeSphere authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package ippool
+
+import (
+	"k8s.io/client-go/util/workqueue"
+	networkv1alpha1 "kubesphere.io/kubesphere/pkg/apis/network/v1alpha1"
+	kubesphereclient "kubesphere.io/kubesphere/pkg/client/clientset/versioned"
+	"kubesphere.io/kubesphere/pkg/simple/client/network/ippool/ipam"
+)
+
+type Provider interface {
+	// canDelete indicates whether the address pool is being used or not.
+	DeleteIPPool(pool *networkv1alpha1.IPPool) (canDelete bool, err error)
+	CreateIPPool(pool *networkv1alpha1.IPPool) error
+	UpdateIPPool(pool *networkv1alpha1.IPPool) error
+	GetIPPoolStats(pool *networkv1alpha1.IPPool) (*networkv1alpha1.IPPool, error)
+	SyncStatus(stopCh <-chan struct{}, q workqueue.RateLimitingInterface) error
+}
+
+type provider struct {
+	kubesphereClient kubesphereclient.Interface
+	ipamclient       ipam.IPAMClient
+}
+
+func (p provider) DeleteIPPool(pool *networkv1alpha1.IPPool) (bool, error) {
+	blocks, err := p.ipamclient.ListBlocks(pool.Name)
+	if err != nil {
+		return false, err
+	}
+
+	for _, block := range blocks {
+		if block.Empty() {
+			if err = p.ipamclient.DeleteBlock(&block); err != nil {
+				return false, err
+			}
+		} else {
+			return false, nil
+		}
+	}
+
+	return true, nil
+}
+
+func (p provider) CreateIPPool(pool *networkv1alpha1.IPPool) error {
+	return nil
+}
+
+func (p provider) UpdateIPPool(pool *networkv1alpha1.IPPool) error {
+	return nil
+}
+
+func (p provider) SyncStatus(stopCh <-chan struct{}, q workqueue.RateLimitingInterface) error {
+	return nil
+}
+
+func (p provider) GetIPPoolStats(pool *networkv1alpha1.IPPool) (*networkv1alpha1.IPPool, error) {
+	stats, err := p.ipamclient.GetUtilization(ipam.GetUtilizationArgs{
+		Pools: []string{pool.Name},
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	stat := stats[0]
+	return &networkv1alpha1.IPPool{
+		Status: networkv1alpha1.IPPoolStatus{
+			Allocations: stat.Allocate,
+			Unallocated: stat.Unallocated,
+			Reserved:    stat.Reserved,
+			Capacity:    stat.Capacity,
+			Synced:      true,
+		},
+	}, nil
+}
+
+func NewProvider(clientset kubesphereclient.Interface, options Options) provider {
+	vlanProvider := provider{
+		kubesphereClient: clientset,
+		ipamclient:       ipam.NewIPAMClient(clientset, networkv1alpha1.VLAN),
+	}
+
+	return vlanProvider
+}