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clusterclient.go
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clusterclient.go
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package kubernetes
import (
"bytes"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"os"
"regexp"
"sort"
"strings"
"time"
log "github.com/sirupsen/logrus"
"github.com/zalando/skipper/dataclients/kubernetes/definitions"
"github.com/zalando/skipper/secrets"
"github.com/zalando/skipper/secrets/certregistry"
)
const (
ingressClassKey = "kubernetes.io/ingress.class"
IngressesV1ClusterURI = "/apis/networking.k8s.io/v1/ingresses"
ZalandoResourcesClusterURI = "/apis/zalando.org/v1"
RouteGroupsName = "routegroups"
RouteGroupsClusterURI = "/apis/zalando.org/v1/routegroups"
routeGroupClassKey = "zalando.org/routegroup.class"
ServicesClusterURI = "/api/v1/services"
EndpointsClusterURI = "/api/v1/endpoints"
EndpointSlicesClusterURI = "/apis/discovery.k8s.io/v1/endpointslices"
SecretsClusterURI = "/api/v1/secrets"
defaultKubernetesURL = "http://localhost:8001"
IngressesV1NamespaceFmt = "/apis/networking.k8s.io/v1/namespaces/%s/ingresses"
RouteGroupsNamespaceFmt = "/apis/zalando.org/v1/namespaces/%s/routegroups"
ServicesNamespaceFmt = "/api/v1/namespaces/%s/services"
EndpointsNamespaceFmt = "/api/v1/namespaces/%s/endpoints"
EndpointSlicesNamespaceFmt = "/apis/discovery.k8s.io/v1/namespaces/%s/endpointslices"
SecretsNamespaceFmt = "/api/v1/namespaces/%s/secrets"
serviceAccountDir = "/var/run/secrets/kubernetes.io/serviceaccount/"
serviceAccountTokenKey = "token"
serviceAccountRootCAKey = "ca.crt"
labelSelectorFmt = "%s=%s"
labelSelectorQueryFmt = "?labelSelector=%s"
)
const RouteGroupsNotInstalledMessage = `RouteGroups CRD is not installed in the cluster.
See: https://opensource.zalando.com/skipper/kubernetes/routegroups/#installation`
type clusterClient struct {
ingressesURI string
routeGroupsURI string
servicesURI string
endpointsURI string
endpointSlicesURI string
secretsURI string
tokenProvider secrets.SecretsProvider
tokenFile string
apiURL string
certificateRegistry *certregistry.CertRegistry
routeGroupClass *regexp.Regexp
ingressClass *regexp.Regexp
httpClient *http.Client
ingressLabelSelectors string
servicesLabelSelectors string
endpointsLabelSelectors string
endpointSlicesLabelSelectors string
secretsLabelSelectors string
routeGroupsLabelSelectors string
enableEndpointSlices bool
loggedMissingRouteGroups bool
routeGroupValidator *definitions.RouteGroupValidator
ingressValidator *definitions.IngressV1Validator
}
var (
errResourceNotFound = errors.New("resource not found")
errServiceNotFound = errors.New("service not found")
errAPIServerURLNotFound = errors.New("kubernetes API server URL could not be constructed from env vars")
errInvalidCertificate = errors.New("invalid CA")
)
func buildHTTPClient(certFilePath string, inCluster bool, quit <-chan struct{}) (*http.Client, error) {
if !inCluster {
return http.DefaultClient, nil
}
rootCA, err := os.ReadFile(certFilePath)
if err != nil {
return nil, err
}
certPool := x509.NewCertPool()
if !certPool.AppendCertsFromPEM(rootCA) {
return nil, errInvalidCertificate
}
transport := &http.Transport{
DialContext: (&net.Dialer{
Timeout: 10 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
TLSHandshakeTimeout: 10 * time.Second,
ResponseHeaderTimeout: 10 * time.Second,
ExpectContinueTimeout: 30 * time.Second,
MaxIdleConns: 5,
MaxIdleConnsPerHost: 5,
TLSClientConfig: &tls.Config{
MinVersion: tls.VersionTLS12,
RootCAs: certPool,
},
}
// regularly force closing idle connections
go func() {
ticker := time.NewTicker(10 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
transport.CloseIdleConnections()
case <-quit:
return
}
}
}()
return &http.Client{
Transport: transport,
}, nil
}
func newClusterClient(o Options, apiURL, ingCls, rgCls string, quit <-chan struct{}) (*clusterClient, error) {
httpClient, err := buildHTTPClient(serviceAccountDir+serviceAccountRootCAKey, o.KubernetesInCluster, quit)
if err != nil {
return nil, err
}
ingClsRx, err := regexp.Compile(ingCls)
if err != nil {
return nil, err
}
rgClsRx, err := regexp.Compile(rgCls)
if err != nil {
return nil, err
}
c := &clusterClient{
ingressesURI: IngressesV1ClusterURI,
routeGroupsURI: RouteGroupsClusterURI,
servicesURI: ServicesClusterURI,
endpointsURI: EndpointsClusterURI,
endpointSlicesURI: EndpointSlicesClusterURI,
secretsURI: SecretsClusterURI,
ingressClass: ingClsRx,
ingressLabelSelectors: toLabelSelectorQuery(o.IngressLabelSelectors),
servicesLabelSelectors: toLabelSelectorQuery(o.ServicesLabelSelectors),
endpointsLabelSelectors: toLabelSelectorQuery(o.EndpointsLabelSelectors),
endpointSlicesLabelSelectors: toLabelSelectorQuery(o.EndpointSlicesLabelSelectors),
secretsLabelSelectors: toLabelSelectorQuery(o.SecretsLabelSelectors),
routeGroupsLabelSelectors: toLabelSelectorQuery(o.RouteGroupsLabelSelectors),
routeGroupClass: rgClsRx,
httpClient: httpClient,
apiURL: apiURL,
certificateRegistry: o.CertificateRegistry,
routeGroupValidator: &definitions.RouteGroupValidator{},
ingressValidator: &definitions.IngressV1Validator{},
enableEndpointSlices: o.KubernetesEnableEndpointslices,
}
if o.KubernetesInCluster {
c.tokenProvider = secrets.NewSecretPaths(time.Minute)
c.tokenFile = serviceAccountDir + serviceAccountTokenKey
} else if o.TokenFile != "" {
c.tokenProvider = secrets.NewSecretPaths(time.Minute)
c.tokenFile = o.TokenFile
}
if c.tokenProvider != nil {
if err := c.tokenProvider.Add(c.tokenFile); err != nil {
return nil, fmt.Errorf("failed to add secret %s: %w", c.tokenFile, err)
}
if b, ok := c.tokenProvider.GetSecret(c.tokenFile); ok {
log.Debugf("Got secret %d bytes from %s", len(b), c.tokenFile)
} else {
return nil, fmt.Errorf("failed to get secret %s", c.tokenFile)
}
}
if o.KubernetesNamespace != "" {
c.setNamespace(o.KubernetesNamespace)
}
return c, nil
}
// serializes a given map of label selectors to a string that can be appended to a request URI to kubernetes
// Examples (note that the resulting value in the query is URL escaped, for readability this is not done in examples):
//
// [] becomes ``
// ["label": ""] becomes `?labelSelector=label`
// ["label": "value"] becomes `?labelSelector=label=value`
// ["label": "value", "label2": "value2"] becomes `?labelSelector=label=value&label2=value2`
func toLabelSelectorQuery(selectors map[string]string) string {
if len(selectors) == 0 {
return ""
}
var strs []string
for k, v := range selectors {
if v == "" {
strs = append(strs, k)
} else {
strs = append(strs, fmt.Sprintf(labelSelectorFmt, k, v))
}
}
return fmt.Sprintf(labelSelectorQueryFmt, url.QueryEscape(strings.Join(strs, ",")))
}
func (c *clusterClient) setNamespace(namespace string) {
c.ingressesURI = fmt.Sprintf(IngressesV1NamespaceFmt, namespace)
c.routeGroupsURI = fmt.Sprintf(RouteGroupsNamespaceFmt, namespace)
c.servicesURI = fmt.Sprintf(ServicesNamespaceFmt, namespace)
c.endpointsURI = fmt.Sprintf(EndpointsNamespaceFmt, namespace)
c.endpointSlicesURI = fmt.Sprintf(EndpointSlicesNamespaceFmt, namespace)
c.secretsURI = fmt.Sprintf(SecretsNamespaceFmt, namespace)
}
func (c *clusterClient) createRequest(uri string, body io.Reader) (*http.Request, error) {
req, err := http.NewRequest("GET", c.apiURL+uri, body)
if err != nil {
return nil, err
}
if c.tokenProvider != nil {
token, ok := c.tokenProvider.GetSecret(c.tokenFile)
if !ok {
return nil, fmt.Errorf("secret not found: %v", c.tokenFile)
}
req.Header.Set("Authorization", "Bearer "+string(token))
}
return req, nil
}
func (c *clusterClient) getJSON(uri string, a interface{}) error {
log.Tracef("making request to: %s", uri)
req, err := c.createRequest(uri, nil)
if err != nil {
return err
}
rsp, err := c.httpClient.Do(req)
if err != nil {
log.Tracef("request to %s failed: %v", uri, err)
return err
}
log.Tracef("request to %s succeeded", uri)
defer rsp.Body.Close()
if rsp.StatusCode == http.StatusNotFound {
return errResourceNotFound
}
if rsp.StatusCode != http.StatusOK {
log.Tracef("request failed, status: %d, %s", rsp.StatusCode, rsp.Status)
return fmt.Errorf("request failed, status: %d, %s", rsp.StatusCode, rsp.Status)
}
b := bytes.NewBuffer(nil)
if _, err = io.Copy(b, rsp.Body); err != nil {
log.Tracef("reading response body failed: %v", err)
return err
}
err = json.Unmarshal(b.Bytes(), a)
if err != nil {
log.Tracef("invalid response format: %v", err)
}
return err
}
func (c *clusterClient) clusterHasRouteGroups() (bool, error) {
var crl ClusterResourceList
if err := c.getJSON(ZalandoResourcesClusterURI, &crl); err != nil { // it probably should bounce once
return false, err
}
for _, cr := range crl.Items {
if cr.Name == RouteGroupsName {
return true, nil
}
}
return false, nil
}
func (c *clusterClient) ingressClassMissmatch(m *definitions.Metadata) bool {
// No Metadata is the same as no annotations for us
if m != nil {
cls, ok := m.Annotations[ingressClassKey]
// Skip loop iteration if not valid ingress (non defined, empty or non defined one)
return ok && cls != "" && !c.ingressClass.MatchString(cls)
}
return false
}
// filterIngressesV1ByClass will filter only the ingresses that have the valid class, these are
// the defined one, empty string class or not class at all
func (c *clusterClient) filterIngressesV1ByClass(items []*definitions.IngressV1Item) []*definitions.IngressV1Item {
validIngs := []*definitions.IngressV1Item{}
for _, ing := range items {
// v1beta1 style
if c.ingressClassMissmatch(ing.Metadata) {
continue
}
// v1 style, TODO(sszuecs) we need also to fetch ingressclass object and check what should be done
if ing.Spec == nil || ing.Spec.IngressClassName == "" || c.ingressClass.MatchString(ing.Spec.IngressClassName) {
validIngs = append(validIngs, ing)
}
}
return validIngs
}
func sortByMetadata(slice interface{}, getMetadata func(int) *definitions.Metadata) {
sort.Slice(slice, func(i, j int) bool {
mI := getMetadata(i)
mJ := getMetadata(j)
if mI == nil && mJ != nil {
return true
} else if mJ == nil {
return false
}
nsI := mI.Namespace
nsJ := mJ.Namespace
if nsI != nsJ {
return nsI < nsJ
}
return mI.Name < mJ.Name
})
}
func (c *clusterClient) loadIngressesV1() ([]*definitions.IngressV1Item, error) {
var il definitions.IngressV1List
if err := c.getJSON(c.ingressesURI+c.ingressLabelSelectors, &il); err != nil {
log.Debugf("requesting all ingresses failed: %v", err)
return nil, err
}
log.Debugf("all ingresses received: %d", len(il.Items))
fItems := c.filterIngressesV1ByClass(il.Items)
log.Debugf("filtered ingresses by ingress class: %d", len(fItems))
sortByMetadata(fItems, func(i int) *definitions.Metadata { return fItems[i].Metadata })
validatedItems := make([]*definitions.IngressV1Item, 0, len(fItems))
for _, i := range fItems {
if err := c.ingressValidator.Validate(i); err != nil {
log.Errorf("[ingress] %v", err)
continue
}
validatedItems = append(validatedItems, i)
}
return validatedItems, nil
}
func (c *clusterClient) LoadRouteGroups() ([]*definitions.RouteGroupItem, error) {
var rgl definitions.RouteGroupList
if err := c.getJSON(c.routeGroupsURI+c.routeGroupsLabelSelectors, &rgl); err != nil {
return nil, err
}
log.Debugf("all routegroups received: %d", len(rgl.Items))
rgs := make([]*definitions.RouteGroupItem, 0, len(rgl.Items))
for _, i := range rgl.Items {
// Validate RouteGroup item.
if err := c.routeGroupValidator.Validate(i); err != nil {
log.Errorf("[routegroup] %v", err)
continue
}
// Check the RouteGroup has a valid class annotation.
// Not defined, or empty are ok too.
if i.Metadata != nil {
cls, ok := i.Metadata.Annotations[routeGroupClassKey]
if ok && cls != "" && !c.routeGroupClass.MatchString(cls) {
continue
}
}
rgs = append(rgs, i)
}
log.Debugf("filtered valid routegroups by routegroups class: %d", len(rgs))
sortByMetadata(rgs, func(i int) *definitions.Metadata { return rgs[i].Metadata })
return rgs, nil
}
func (c *clusterClient) loadServices() (map[definitions.ResourceID]*service, error) {
var services serviceList
if err := c.getJSON(c.servicesURI+c.servicesLabelSelectors, &services); err != nil {
log.Debugf("requesting all services failed: %v", err)
return nil, err
}
log.Debugf("all services received: %d", len(services.Items))
result := make(map[definitions.ResourceID]*service)
var hasInvalidService bool
for _, service := range services.Items {
if service == nil || service.Meta == nil || service.Spec == nil {
hasInvalidService = true
continue
}
result[service.Meta.ToResourceID()] = service
}
if hasInvalidService {
log.Errorf("Invalid service resource detected.")
}
return result, nil
}
func (c *clusterClient) loadSecrets() (map[definitions.ResourceID]*secret, error) {
var secrets secretList
if err := c.getJSON(c.secretsURI+c.secretsLabelSelectors, &secrets); err != nil {
log.Debugf("requesting all secrets failed: %v", err)
return nil, err
}
log.Debugf("all secrets received: %d", len(secrets.Items))
result := make(map[definitions.ResourceID]*secret)
for _, secret := range secrets.Items {
if secret == nil || secret.Metadata == nil {
continue
}
result[secret.Metadata.ToResourceID()] = secret
}
return result, nil
}
func (c *clusterClient) loadEndpoints() (map[definitions.ResourceID]*endpoint, error) {
var endpoints endpointList
if err := c.getJSON(c.endpointsURI+c.endpointsLabelSelectors, &endpoints); err != nil {
log.Debugf("requesting all endpoints failed: %v", err)
return nil, err
}
log.Debugf("all endpoints received: %d", len(endpoints.Items))
result := make(map[definitions.ResourceID]*endpoint)
for _, endpoint := range endpoints.Items {
resID := endpoint.Meta.ToResourceID()
result[resID] = endpoint
}
return result, nil
}
// loadEndpointSlices is different from the other load$Kind()
// functions because there are 1..N endpointslices created for a given
// service. Endpointslices need to be deduplicated and state needs to
// be checked. We read all endpointslices and create de-duplicated
// business objects [skipperEndpointSlice] instead of raw Kubernetes
// objects, because we need just a clean list of load balancer
// members. The returned map will return the full list of ready
// non-terminating endpoints that should be in the load balancer of a
// given service, check [endpointSlice.ToResourceID].
func (c *clusterClient) loadEndpointSlices() (map[definitions.ResourceID]*skipperEndpointSlice, error) {
var endpointSlices endpointSliceList
if err := c.getJSON(c.endpointSlicesURI+c.endpointSlicesLabelSelectors, &endpointSlices); err != nil {
log.Debugf("requesting all endpointslices failed: %v", err)
return nil, err
}
log.Debugf("all endpointslices received: %d", len(endpointSlices.Items))
return collectReadyEndpoints(&endpointSlices), nil
}
func collectReadyEndpoints(endpointSlices *endpointSliceList) map[definitions.ResourceID]*skipperEndpointSlice {
mapSlices := make(map[definitions.ResourceID][]*endpointSlice)
for _, endpointSlice := range endpointSlices.Items {
resID := endpointSlice.ToResourceID() // service resource ID
mapSlices[resID] = append(mapSlices[resID], endpointSlice)
}
result := make(map[definitions.ResourceID]*skipperEndpointSlice)
for resID, epSlices := range mapSlices {
if len(epSlices) == 0 {
continue
}
result[resID] = &skipperEndpointSlice{
Meta: epSlices[0].Meta,
}
terminatingEps := make(map[string]struct{})
resEps := make(map[string]*skipperEndpoint)
for i := range epSlices {
for _, ep := range epSlices[i].Endpoints {
// Addresses [1..100] of the same AddressType, as kube-proxy we use the first
// see also https://github.com/kubernetes/kubernetes/issues/106267
address := ep.Addresses[0]
if _, ok := terminatingEps[address]; ok {
// already known terminating
} else if ep.isTerminating() {
terminatingEps[address] = struct{}{}
// if we had this one with a non terminating condition,
// we should delete it, because of eventual consistency
// it is actually terminating
delete(resEps, address)
} else if ep.Conditions == nil {
// if conditions are nil then we need to treat is as ready
resEps[address] = &skipperEndpoint{
Address: address,
Zone: ep.Zone,
}
} else if ep.isReady() {
resEps[address] = &skipperEndpoint{
Address: address,
Zone: ep.Zone,
}
}
}
result[resID].Ports = epSlices[i].Ports
}
for _, o := range resEps {
result[resID].Endpoints = append(result[resID].Endpoints, o)
}
}
return result
}
// loadEndpointAddresses returns the list of all addresses for the given service using endpoints or endpointslices API.
func (c *clusterClient) loadEndpointAddresses(namespace, name string) ([]string, error) {
var result []string
if c.enableEndpointSlices {
url := fmt.Sprintf(EndpointSlicesNamespaceFmt, namespace) +
toLabelSelectorQuery(map[string]string{endpointSliceServiceNameLabel: name})
var endpointSlices endpointSliceList
if err := c.getJSON(url, &endpointSlices); err != nil {
return nil, fmt.Errorf("requesting endpointslices for %s/%s failed: %w", namespace, name, err)
}
ready := collectReadyEndpoints(&endpointSlices)
if len(ready) != 1 {
return nil, fmt.Errorf("unexpected number of endpoint slices for %s/%s: %d", namespace, name, len(ready))
}
for _, eps := range ready {
result = eps.addresses()
break
}
} else {
url := fmt.Sprintf(EndpointsNamespaceFmt, namespace) + "/" + name
var ep endpoint
if err := c.getJSON(url, &ep); err != nil {
return nil, fmt.Errorf("requesting endpoints for %s/%s failed: %w", namespace, name, err)
}
result = ep.addresses()
}
sort.Strings(result)
return result, nil
}
func (c *clusterClient) logMissingRouteGroupsOnce() {
if c.loggedMissingRouteGroups {
return
}
c.loggedMissingRouteGroups = true
log.Warn(RouteGroupsNotInstalledMessage)
}
func (c *clusterClient) fetchClusterState() (*clusterState, error) {
var (
err error
ingressesV1 []*definitions.IngressV1Item
)
ingressesV1, err = c.loadIngressesV1()
if err != nil {
return nil, err
}
var routeGroups []*definitions.RouteGroupItem
if hasRouteGroups, err := c.clusterHasRouteGroups(); errors.Is(err, errResourceNotFound) {
c.logMissingRouteGroupsOnce()
} else if err != nil {
log.Errorf("Error while checking known resource types: %v.", err)
} else if hasRouteGroups {
c.loggedMissingRouteGroups = false
if routeGroups, err = c.LoadRouteGroups(); err != nil {
return nil, err
}
}
services, err := c.loadServices()
if err != nil {
return nil, err
}
state := &clusterState{
ingressesV1: ingressesV1,
routeGroups: routeGroups,
services: services,
cachedEndpoints: make(map[endpointID][]string),
enableEndpointSlices: c.enableEndpointSlices,
}
if c.enableEndpointSlices {
state.endpointSlices, err = c.loadEndpointSlices()
if err != nil {
return nil, err
}
} else {
state.endpoints, err = c.loadEndpoints()
if err != nil {
return nil, err
}
}
if c.certificateRegistry != nil {
state.secrets, err = c.loadSecrets()
if err != nil {
return nil, err
}
}
return state, nil
}