/
repository.go
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/
repository.go
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//
// Copyright (c) 2018 Juniper Networks, Inc. All Rights Reserved.
//
// 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 hns
import (
"errors"
"fmt"
"strings"
"github.com/Juniper/contrail-windows-docker-driver/common"
"github.com/Microsoft/hcsshim"
)
// HNSContrailNetworksRepository handles local HNS networks associated to Contrail subnets.
// It does it by naming the HNS networks in a specific way. The name of HNS network contains
// Contrail FQ (fully qualified) name as well as subnet CIDR. This guarantees 1-to-1 correspondence
// of HNS network with a Contrail subnet. Also, it keeps the driver stateless (relevant state is
// held directly in HNS). An alternative would be to have a local DB (like SQLite) that stores
// associations.
type HNSContrailNetworksRepository struct{}
func associationNameForHNSNetworkContrailSubnet(tenant, netName, subnetCIDR string) string {
return fmt.Sprintf("%s:%s:%s:%s", common.HNSNetworkPrefix, tenant, netName, subnetCIDR)
}
func (repo *HNSContrailNetworksRepository) CreateNetwork(netAdapter common.AdapterName, tenantName, networkName,
subnetCIDR, defaultGW string) (*hcsshim.HNSNetwork, error) {
hnsNetName := associationNameForHNSNetworkContrailSubnet(tenantName, networkName, subnetCIDR)
net, err := GetHNSNetworkByName(hnsNetName)
if net != nil {
return nil, errors.New("Such HNS network already exists")
}
subnets := []hcsshim.Subnet{
{
AddressPrefix: subnetCIDR,
GatewayAddress: defaultGW,
},
}
configuration := &hcsshim.HNSNetwork{
Name: hnsNetName,
Type: "transparent",
NetworkAdapterName: string(netAdapter),
Subnets: subnets,
}
hnsNetworkID, err := CreateHNSNetwork(configuration)
if err != nil {
return nil, err
}
hnsNetwork, err := GetHNSNetwork(hnsNetworkID)
if err != nil {
return nil, err
}
return hnsNetwork, nil
}
func (repo *HNSContrailNetworksRepository) GetNetwork(tenantName, networkName, subnetCIDR string) (*hcsshim.HNSNetwork,
error) {
hnsNetName := associationNameForHNSNetworkContrailSubnet(tenantName, networkName, subnetCIDR)
hnsNetwork, err := GetHNSNetworkByName(hnsNetName)
if err != nil {
return nil, err
}
if hnsNetwork == nil {
return nil, errors.New("Such HNS network does not exist")
}
return hnsNetwork, nil
}
func (repo *HNSContrailNetworksRepository) DeleteNetwork(tenantName, networkName, subnetCIDR string) error {
hnsNetwork, err := repo.GetNetwork(tenantName, networkName, subnetCIDR)
if err != nil {
return err
}
endpoints, err := ListHNSEndpoints()
if err != nil {
return err
}
for _, ep := range endpoints {
if ep.VirtualNetworkName == hnsNetwork.Name {
return errors.New("Cannot delete network with active endpoints")
}
}
return DeleteHNSNetwork(hnsNetwork.Id)
}
func (repo *HNSContrailNetworksRepository) ListNetworks() ([]hcsshim.HNSNetwork, error) {
var validNets []hcsshim.HNSNetwork
nets, err := ListHNSNetworks()
if err != nil {
return validNets, err
}
for _, net := range nets {
splitName := strings.Split(net.Name, ":")
if len(splitName) == 4 {
if splitName[0] == common.HNSNetworkPrefix {
validNets = append(validNets, net)
}
}
}
return validNets, nil
}