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api.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2021 Authors of Cilium
package api
import (
"context"
"errors"
"fmt"
"net"
"time"
eniTypes "github.com/cilium/cilium/pkg/alibabacloud/eni/types"
"github.com/cilium/cilium/pkg/alibabacloud/types"
"github.com/cilium/cilium/pkg/api/helpers"
"github.com/cilium/cilium/pkg/cidr"
ipamTypes "github.com/cilium/cilium/pkg/ipam/types"
"github.com/cilium/cilium/pkg/math"
"github.com/cilium/cilium/pkg/spanstat"
httperr "github.com/aliyun/alibaba-cloud-sdk-go/sdk/errors"
"github.com/aliyun/alibaba-cloud-sdk-go/sdk/requests"
"github.com/aliyun/alibaba-cloud-sdk-go/services/ecs"
"github.com/aliyun/alibaba-cloud-sdk-go/services/vpc"
"k8s.io/apimachinery/pkg/util/wait"
)
const (
VPCID = "VPCID"
MaxListByTagSize = 20
)
var maxAttachRetries = wait.Backoff{
Duration: 4 * time.Second,
Factor: 1,
Jitter: 0.1,
Steps: 4,
Cap: 0,
}
// Client an AlibabaCloud API client
type Client struct {
vpcClient *vpc.Client
ecsClient *ecs.Client
limiter *helpers.ApiLimiter
metricsAPI MetricsAPI
filters map[string]string
}
// MetricsAPI represents the metrics maintained by the AlibabaCloud API client
type MetricsAPI interface {
helpers.MetricsAPI
ObserveAPICall(call, status string, duration float64)
}
// NewClient create the client
func NewClient(vpcClient *vpc.Client, client *ecs.Client, metrics MetricsAPI, rateLimit float64, burst int, filters map[string]string) *Client {
return &Client{
vpcClient: vpcClient,
ecsClient: client,
limiter: helpers.NewApiLimiter(metrics, rateLimit, burst),
metricsAPI: metrics,
filters: filters,
}
}
// GetInstances returns the list of all instances including their ENIs as instanceMap
func (c *Client) GetInstances(ctx context.Context, vpcs ipamTypes.VirtualNetworkMap, subnets ipamTypes.SubnetMap) (*ipamTypes.InstanceMap, error) {
instances := ipamTypes.NewInstanceMap()
networkInterfaceSets, err := c.describeNetworkInterfaces(ctx, subnets)
if err != nil {
return nil, err
}
for _, iface := range networkInterfaceSets {
id, eni, err := parseENI(&iface, vpcs, subnets)
if err != nil {
return nil, err
}
instances.Update(id, ipamTypes.InterfaceRevision{
Resource: eni,
})
}
return instances, nil
}
// GetVSwitches returns all ecs vSwitches as a subnetMap
func (c *Client) GetVSwitches(ctx context.Context) (ipamTypes.SubnetMap, error) {
var result ipamTypes.SubnetMap
vsws := []string{}
for i := 1; ; {
req := vpc.CreateDescribeVSwitchesRequest()
req.PageNumber = requests.NewInteger(i)
req.PageSize = requests.NewInteger(50)
req.VpcId = c.filters[VPCID]
c.limiter.Limit(ctx, "DescribeVSwitches")
resp, err := c.vpcClient.DescribeVSwitches(req)
if err != nil {
return nil, err
}
if len(resp.VSwitches.VSwitch) == 0 {
break
}
if result == nil {
result = make(ipamTypes.SubnetMap, resp.TotalCount)
}
for _, v := range resp.VSwitches.VSwitch {
_, ipnet, err := net.ParseCIDR(v.CidrBlock)
if err != nil {
return nil, err
}
result[v.VSwitchId] = &ipamTypes.Subnet{
ID: v.VSwitchId,
Name: v.VSwitchName,
CIDR: cidr.NewCIDR(ipnet),
AvailabilityZone: v.ZoneId,
VirtualNetworkID: v.VpcId,
AvailableAddresses: int(v.AvailableIpAddressCount),
Tags: map[string]string{},
}
vsws = append(vsws, v.VSwitchId)
}
if resp.TotalCount < resp.PageNumber*resp.PageSize {
break
}
i++
}
for i := 0; i <= (len(vsws)-1)/MaxListByTagSize; i++ {
var ids []string
tail := math.IntMin((i+1)*MaxListByTagSize, len(vsws))
ids = vsws[i*MaxListByTagSize : tail]
req := vpc.CreateListTagResourcesRequest()
req.ResourceType = "VSWITCH"
req.ResourceId = &ids
c.limiter.Limit(ctx, "ListTagResources")
resp, err := c.vpcClient.ListTagResources(req)
if err != nil {
return nil, err
}
for _, tagRes := range resp.TagResources.TagResource {
subnet, ok := result[tagRes.ResourceId]
if !ok {
continue
}
subnet.Tags[tagRes.TagKey] = tagRes.TagValue
}
}
return result, nil
}
// GetVPC get vpc by id
func (c *Client) GetVPC(ctx context.Context, vpcID string) (*ipamTypes.VirtualNetwork, error) {
req := vpc.CreateDescribeVpcsRequest()
req.VpcId = vpcID
c.limiter.Limit(ctx, "DescribeVpcs")
resp, err := c.vpcClient.DescribeVpcs(req)
if err != nil {
return nil, err
}
if len(resp.Vpcs.Vpc) == 0 {
return nil, fmt.Errorf("cannot find VPC by ID %s", vpcID)
}
return &ipamTypes.VirtualNetwork{
ID: resp.Vpcs.Vpc[0].VpcId,
PrimaryCIDR: resp.Vpcs.Vpc[0].CidrBlock,
}, nil
}
// GetVPCs retrieves and returns all VPCs
func (c *Client) GetVPCs(ctx context.Context) (ipamTypes.VirtualNetworkMap, error) {
var result ipamTypes.VirtualNetworkMap
for i := 1; ; {
req := vpc.CreateDescribeVpcsRequest()
req.PageNumber = requests.NewInteger(i)
req.PageSize = requests.NewInteger(50)
resp, err := c.vpcClient.DescribeVpcs(req)
if err != nil {
return nil, err
}
if len(resp.Vpcs.Vpc) == 0 {
break
}
if result == nil {
result = make(ipamTypes.VirtualNetworkMap, resp.TotalCount)
}
for _, v := range resp.Vpcs.Vpc {
result[v.VpcId] = &ipamTypes.VirtualNetwork{
ID: v.VpcId,
PrimaryCIDR: v.CidrBlock,
}
}
if resp.TotalCount < resp.PageNumber*resp.PageSize {
break
}
i++
}
return result, nil
}
// GetInstanceTypes returns all the known ECS instance types in the configured region
func (c *Client) GetInstanceTypes(ctx context.Context) ([]ecs.InstanceType, error) {
req := ecs.CreateDescribeInstanceTypesRequest()
resp, err := c.ecsClient.DescribeInstanceTypes(req)
if err != nil {
return nil, err
}
return resp.InstanceTypes.InstanceType, nil
}
// GetSecurityGroups return all sg
func (c *Client) GetSecurityGroups(ctx context.Context) (types.SecurityGroupMap, error) {
var result types.SecurityGroupMap
for i := 1; ; {
req := ecs.CreateDescribeSecurityGroupsRequest()
req.PageNumber = requests.NewInteger(i)
req.PageSize = requests.NewInteger(50)
resp, err := c.ecsClient.DescribeSecurityGroups(req)
if err != nil {
return nil, err
}
if len(resp.SecurityGroups.SecurityGroup) == 0 {
break
}
if result == nil {
result = make(types.SecurityGroupMap, resp.TotalCount)
}
for _, v := range resp.SecurityGroups.SecurityGroup {
result[v.VpcId] = &types.SecurityGroup{
ID: v.SecurityGroupId,
VPCID: v.VpcId,
Tags: parseECSTags(v.Tags.Tag),
}
}
if resp.TotalCount < resp.PageNumber*resp.PageSize {
break
}
i++
}
return result, nil
}
// DescribeNetworkInterface get ENI by id
func (c *Client) DescribeNetworkInterface(ctx context.Context, eniID string) (*ecs.NetworkInterfaceSet, error) {
req := ecs.CreateDescribeNetworkInterfacesRequest()
req.NetworkInterfaceId = &[]string{eniID}
resp, err := c.ecsClient.DescribeNetworkInterfaces(req)
if err != nil {
return nil, err
}
if len(resp.NetworkInterfaceSets.NetworkInterfaceSet) == 0 {
return nil, fmt.Errorf("failed to find eni %s", eniID)
}
return &resp.NetworkInterfaceSets.NetworkInterfaceSet[0], nil
}
// CreateNetworkInterface creates an ENI with the given parameters
func (c *Client) CreateNetworkInterface(ctx context.Context, secondaryPrivateIPCount int, vSwitchID string, groups []string, tags map[string]string) (string, *eniTypes.ENI, error) {
req := ecs.CreateCreateNetworkInterfaceRequest()
req.SecondaryPrivateIpAddressCount = requests.NewInteger(secondaryPrivateIPCount)
req.VSwitchId = vSwitchID
req.SecurityGroupIds = &groups
reqTag := make([]ecs.CreateNetworkInterfaceTag, 0, len(tags))
for k, v := range tags {
reqTag = append(reqTag, ecs.CreateNetworkInterfaceTag{
Key: k,
Value: v,
})
}
req.Tag = &reqTag
c.limiter.Limit(ctx, "CreateNetworkInterface")
sinceStart := spanstat.Start()
resp, err := c.ecsClient.CreateNetworkInterface(req)
c.metricsAPI.ObserveAPICall("CreateNetworkInterface", deriveStatus(err), sinceStart.Seconds())
if err != nil {
return "", nil, err
}
var privateIPSets []eniTypes.PrivateIPSet
for _, p := range resp.PrivateIpSets.PrivateIpSet {
privateIPSets = append(privateIPSets, eniTypes.PrivateIPSet{
Primary: p.Primary,
PrivateIpAddress: p.PrivateIpAddress,
})
}
eni := &eniTypes.ENI{
NetworkInterfaceID: resp.NetworkInterfaceId,
MACAddress: resp.MacAddress,
Type: resp.Type,
SecurityGroupIDs: resp.SecurityGroupIds.SecurityGroupId,
VPC: eniTypes.VPC{
VPCID: resp.VpcId,
},
ZoneID: resp.ZoneId,
VSwitch: eniTypes.VSwitch{
VSwitchID: resp.VSwitchId,
},
PrimaryIPAddress: resp.PrivateIpAddress,
PrivateIPSets: privateIPSets,
Tags: parseECSTags(resp.Tags.Tag),
}
return resp.NetworkInterfaceId, eni, nil
}
// AttachNetworkInterface attaches a previously created ENI to an instance
func (c *Client) AttachNetworkInterface(ctx context.Context, instanceID, eniID string) error {
req := ecs.CreateAttachNetworkInterfaceRequest()
req.InstanceId = instanceID
req.NetworkInterfaceId = eniID
c.limiter.Limit(ctx, "AttachNetworkInterface")
sinceStart := spanstat.Start()
_, err := c.ecsClient.AttachNetworkInterface(req)
c.metricsAPI.ObserveAPICall("AttachNetworkInterface", deriveStatus(err), sinceStart.Seconds())
if err != nil {
return err
}
return nil
}
// WaitENIAttached check ENI is attached to ECS and return attached ECS instanceID
func (c *Client) WaitENIAttached(ctx context.Context, eniID string) (string, error) {
instanceID := ""
err := wait.ExponentialBackoffWithContext(ctx, maxAttachRetries, func() (done bool, err error) {
eni, err := c.DescribeNetworkInterface(ctx, eniID)
if err != nil {
return false, err
}
if eni.Status == "InUse" {
instanceID = eni.InstanceId
return true, nil
}
return false, nil
})
if err != nil {
return "", err
}
return instanceID, nil
}
// DeleteNetworkInterface deletes an ENI with the specified ID
func (c *Client) DeleteNetworkInterface(ctx context.Context, eniID string) error {
req := ecs.CreateDeleteNetworkInterfaceRequest()
req.NetworkInterfaceId = eniID
_, err := c.ecsClient.DeleteNetworkInterface(req)
if err != nil {
return err
}
return nil
}
// AssignPrivateIPAddresses assigns the specified number of secondary IP
// return allocated IPs
func (c *Client) AssignPrivateIPAddresses(ctx context.Context, eniID string, toAllocate int) ([]string, error) {
req := ecs.CreateAssignPrivateIpAddressesRequest()
req.NetworkInterfaceId = eniID
req.SecondaryPrivateIpAddressCount = requests.NewInteger(toAllocate)
resp, err := c.ecsClient.AssignPrivateIpAddresses(req)
if err != nil {
return nil, err
}
return resp.AssignedPrivateIpAddressesSet.PrivateIpSet.PrivateIpAddress, nil
}
// PrUnassignivateIPAddresses unassign specified IP addresses from ENI
// should not provide Primary IP
func (c *Client) UnassignPrivateIPAddresses(ctx context.Context, eniID string, addresses []string) error {
req := ecs.CreateUnassignPrivateIpAddressesRequest()
req.NetworkInterfaceId = eniID
req.PrivateIpAddress = &addresses
_, err := c.ecsClient.UnassignPrivateIpAddresses(req)
return err
}
func (c *Client) describeNetworkInterfaces(ctx context.Context, subnets ipamTypes.SubnetMap) ([]ecs.NetworkInterfaceSet, error) {
var result []ecs.NetworkInterfaceSet
for _, subnet := range subnets {
for i := 1; ; {
req := ecs.CreateDescribeNetworkInterfacesRequest()
req.PageNumber = requests.NewInteger(i)
req.PageSize = requests.NewInteger(50)
req.VSwitchId = subnet.ID
c.limiter.Limit(ctx, "DescribeNetworkInterfaces")
resp, err := c.ecsClient.DescribeNetworkInterfaces(req)
if err != nil {
return nil, err
}
if len(resp.NetworkInterfaceSets.NetworkInterfaceSet) == 0 {
break
}
for _, v := range resp.NetworkInterfaceSets.NetworkInterfaceSet {
result = append(result, v)
}
if resp.TotalCount < resp.PageNumber*resp.PageSize {
break
}
i++
}
}
return result, nil
}
// deriveStatus returns a status string based on the HTTP response provided by
// the AlibabaCloud API server. If no specific status is provided, either "OK" or
// "Failed" is returned based on the error variable.
func deriveStatus(err error) string {
var respErr httperr.Error
if errors.As(err, &respErr) {
return respErr.ErrorCode()
}
if err != nil {
return "Failed"
}
return "OK"
}
// parseENI parses a ecs.NetworkInterface as returned by the ecs service API,
// converts it into a eniTypes.ENI object
func parseENI(iface *ecs.NetworkInterfaceSet, vpcs ipamTypes.VirtualNetworkMap, subnets ipamTypes.SubnetMap) (instanceID string, eni *eniTypes.ENI, err error) {
var privateIPSets []eniTypes.PrivateIPSet
for _, p := range iface.PrivateIpSets.PrivateIpSet {
privateIPSets = append(privateIPSets, eniTypes.PrivateIPSet{
Primary: p.Primary,
PrivateIpAddress: p.PrivateIpAddress,
})
}
eni = &eniTypes.ENI{
NetworkInterfaceID: iface.NetworkInterfaceId,
MACAddress: iface.MacAddress,
Type: iface.Type,
InstanceID: iface.InstanceId,
SecurityGroupIDs: iface.SecurityGroupIds.SecurityGroupId,
VPC: eniTypes.VPC{
VPCID: iface.VpcId,
},
ZoneID: iface.ZoneId,
VSwitch: eniTypes.VSwitch{
VSwitchID: iface.VSwitchId,
},
PrimaryIPAddress: iface.PrivateIpAddress,
PrivateIPSets: privateIPSets,
Tags: parseECSTags(iface.Tags.Tag),
}
vpc, ok := vpcs[iface.VpcId]
if ok {
eni.VPC.CIDRBlock = vpc.PrimaryCIDR
}
subnet, ok := subnets[iface.VSwitchId]
if ok && subnet.CIDR != nil {
eni.VSwitch.CIDRBlock = subnet.CIDR.String()
}
return iface.InstanceId, eni, nil
}
// parseECSTags convert ECS Tags to ipam Tags
func parseECSTags(tags []ecs.Tag) ipamTypes.Tags {
result := make(ipamTypes.Tags, len(tags))
for _, tag := range tags {
result[tag.TagKey] = tag.TagValue
}
return result
}