/
clusterclient.go
374 lines (316 loc) · 9.39 KB
/
clusterclient.go
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package kubernetes
import (
"bytes"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"regexp"
"sort"
"time"
log "github.com/sirupsen/logrus"
)
const (
ingressClassKey = "kubernetes.io/ingress.class"
ingressesClusterURI = "/apis/extensions/v1beta1/ingresses"
clusterZalandoResourcesURI = "/apis/zalando.org/v1"
routeGroupsName = "routegroups"
routeGroupsClusterURI = "/apis/zalando.org/v1/routegroups"
servicesClusterURI = "/api/v1/services"
endpointsClusterURI = "/api/v1/endpoints"
defaultKubernetesURL = "http://localhost:8001"
ingressesNamespaceFmt = "/apis/extensions/v1beta1/namespaces/%s/ingresses"
routeGroupsNamespaceFmt = "/apis/zalando.org/v1/namespaces/%s/routegroups"
servicesNamespaceFmt = "/api/v1/namespaces/%s/services"
endpointsNamespaceFmt = "/api/v1/namespaces/%s/endpoints"
serviceAccountDir = "/var/run/secrets/kubernetes.io/serviceaccount/"
serviceAccountTokenKey = "token"
serviceAccountRootCAKey = "ca.crt"
)
type clusterClient struct {
ingressesURI string
routeGroupsURI string
servicesURI string
endpointsURI string
ingressClass *regexp.Regexp
token string
httpClient *http.Client
apiURL string
}
var (
errResourceNotFound = errors.New("resource not found")
errServiceNotFound = errors.New("service not found")
errEndpointNotFound = errors.New("endpoint 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 := ioutil.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() {
for {
select {
case <-time.After(10 * time.Second):
transport.CloseIdleConnections()
case <-quit:
return
}
}
}()
return &http.Client{
Transport: transport,
}, nil
}
func readServiceAccountToken(tokenFilePath string, inCluster bool) (string, error) {
if !inCluster {
return "", nil
}
bToken, err := ioutil.ReadFile(tokenFilePath)
if err != nil {
return "", err
}
return string(bToken), nil
}
func newClusterClient(o Options, apiURL, ingCls string, quit <-chan struct{}) (*clusterClient, error) {
token, err := readServiceAccountToken(serviceAccountDir+serviceAccountTokenKey, o.KubernetesInCluster)
if err != nil {
return nil, err
}
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
}
c := &clusterClient{
ingressesURI: ingressesClusterURI,
routeGroupsURI: routeGroupsClusterURI,
servicesURI: servicesClusterURI,
endpointsURI: endpointsClusterURI,
ingressClass: ingClsRx,
httpClient: httpClient,
token: token,
apiURL: apiURL,
}
if o.KubernetesNamespace != "" {
c.setNamespace(o.KubernetesNamespace)
}
return c, nil
}
func (c *clusterClient) setNamespace(namespace string) {
c.ingressesURI = fmt.Sprintf(ingressesNamespaceFmt, namespace)
c.routeGroupsURI = fmt.Sprintf(routeGroupsNamespaceFmt, namespace)
c.servicesURI = fmt.Sprintf(servicesNamespaceFmt, namespace)
c.endpointsURI = fmt.Sprintf(endpointsNamespaceFmt, 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.token != "" {
req.Header.Set("Authorization", "Bearer "+c.token)
}
return req, nil
}
func (c *clusterClient) getJSON(uri string, a interface{}) error {
log.Debugf("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.Debugf("request to %s failed: %v", uri, err)
return err
}
log.Debugf("request to %s succeeded", uri)
defer rsp.Body.Close()
if rsp.StatusCode == http.StatusNotFound {
return errResourceNotFound
}
if rsp.StatusCode != http.StatusOK {
log.Debugf("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.Debugf("reading response body failed: %v", err)
return err
}
err = json.Unmarshal(b.Bytes(), a)
if err != nil {
log.Debugf("invalid response format: %v", err)
}
return err
}
func (c *clusterClient) clusterHasRouteGroups() (bool, error) {
var crl clusterResourceList
if err := c.getJSON(clusterZalandoResourcesURI, &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
}
// filterIngressesByClass 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) filterIngressesByClass(items []*ingressItem) []*ingressItem {
validIngs := []*ingressItem{}
for _, ing := range items {
// No metadata is the same as no annotations for us
if ing.Metadata != nil {
cls, ok := ing.Metadata.Annotations[ingressClassKey]
// Skip loop iteration if not valid ingress (non defined, empty or non defined one)
if ok && cls != "" && !c.ingressClass.MatchString(cls) {
continue
}
}
validIngs = append(validIngs, ing)
}
return validIngs
}
func sortByMetadata(slice interface{}, getMetadata func(int) *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) loadIngresses() ([]*ingressItem, error) {
var il ingressList
if err := c.getJSON(c.ingressesURI, &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.filterIngressesByClass(il.Items)
log.Debugf("filtered ingresses by ingress class: %d", len(fItems))
sortByMetadata(fItems, func(i int) *metadata { return fItems[i].Metadata })
return fItems, nil
}
func (c *clusterClient) loadRouteGroups() ([]*routeGroupItem, error) {
var rgl routeGroupList
if err := c.getJSON(c.routeGroupsURI, &rgl); err != nil {
return nil, err
}
rgs := make([]*routeGroupItem, 0, len(rgl.Items))
for _, i := range rgl.Items {
if err := i.validate(); err != nil {
log.Errorf("[routegroup] %v", err)
continue
}
rgs = append(rgs, i)
}
sortByMetadata(rgs, func(i int) *metadata { return rgs[i].Metadata })
return rgs, nil
}
func (c *clusterClient) loadServices() (map[resourceID]*service, error) {
var services serviceList
if err := c.getJSON(c.servicesURI, &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[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) loadEndpoints() (map[resourceID]*endpoint, error) {
var endpoints endpointList
if err := c.getJSON(c.endpointsURI, &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[resourceID]*endpoint)
for _, endpoint := range endpoints.Items {
result[endpoint.Meta.toResourceID()] = endpoint
}
return result, nil
}
func (c *clusterClient) fetchClusterState() (*clusterState, error) {
ingresses, err := c.loadIngresses()
if err != nil {
return nil, err
}
var routeGroups []*routeGroupItem
if hasRouteGroups, err := c.clusterHasRouteGroups(); err != nil {
log.Errorf("Error while checking known resource types: %v.", err)
} else if hasRouteGroups {
if routeGroups, err = c.loadRouteGroups(); err != nil {
return nil, err
}
}
services, err := c.loadServices()
if err != nil {
return nil, err
}
endpoints, err := c.loadEndpoints()
if err != nil {
return nil, err
}
return &clusterState{
ingresses: ingresses,
routeGroups: routeGroups,
services: services,
endpoints: endpoints,
cachedEndpoints: make(map[endpointID][]string),
}, nil
}