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/ipam/interface.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2020 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 ipam
+
+import (
+	"github.com/containernetworking/cni/pkg/types/current"
+	"kubesphere.io/kubesphere/pkg/apis/network/v1alpha1"
+)
+
+// ipam.Interface has methods to perform IP address management.
+type Interface interface {
+	// AutoAssign automatically assigns one or more IP addresses as specified by the
+	// provided AutoAssignArgs.  AutoAssign returns the list of the assigned IPv4 addresses,
+	// and the list of the assigned IPv6 addresses in IPNet format.
+	// The returned IPNet represents the allocation block from which the IP was allocated,
+	// which is useful for dataplanes that need to know the subnet (such as Windows).
+	//
+	// In case of error, returns the IPs allocated so far along with the error.
+	AutoAssign(args AutoAssignArgs) (*current.Result, error)
+
+	// ReleaseByHandle releases all IP addresses that have been assigned
+	// using the provided handle.  Returns an error if no addresses
+	// are assigned with the given handle.
+	ReleaseByHandle(handleID string) error
+
+	GetUtilization(args GetUtilizationArgs) ([]*PoolUtilization, error)
+}
+
+// Interface used to access the enabled IPPools.
+type PoolAccessorInterface interface {
+	// Returns a list of all pools sorted in alphanumeric name order.
+	getAllPools() ([]v1alpha1.IPPool, error)
+}