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Merge pull request #516 from pnegahdar/selector

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Implement Kubernetes Selectors, minor kube endpoint fix
This commit is contained in:
Emile Vauge 2016-07-13 19:22:40 +02:00 committed by GitHub
commit 94fa95d747
6 changed files with 82 additions and 43 deletions
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3
configuration.go
View file

@ -272,7 +272,8 @@ func NewTraefikDefaultPointersConfiguration() *TraefikConfiguration {
//default Kubernetes
var defaultKubernetes provider.Kubernetes
defaultKubernetes.Watch = true
defaultKubernetes.Endpoint = "http://127.0.0.1:8080"
defaultKubernetes.Endpoint = ""
defaultKubernetes.LabelSelector = ""
defaultKubernetes.Constraints = []types.Constraint{}
defaultConfiguration := GlobalConfiguration{

4
docs/toml.md
View file

@ -665,6 +665,10 @@ Træfɪk can be configured to use Kubernetes Ingress as a backend configuration:
#
# endpoint = "http://localhost:8080"
# namespaces = ["default","production"]
#
# See: http://kubernetes.io/docs/user-guide/labels/#list-and-watch-filtering
# labelselector = "A and not B"
#
```
Annotations can be used on containers to override default behaviour for the whole Ingress resource:

88
provider/k8s/client.go
View file

@ -5,6 +5,7 @@ import (
"crypto/x509"
"encoding/json"
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/parnurzeal/gorequest"
"net/http"
"net/url"
@ -21,10 +22,10 @@ const (
// Client is a client for the Kubernetes master.
type Client interface {
GetIngresses(predicate func(Ingress) bool) ([]Ingress, error)
GetIngresses(labelSelector string, predicate func(Ingress) bool) ([]Ingress, error)
GetService(name, namespace string) (Service, error)
GetEndpoints(name, namespace string) (Endpoints, error)
WatchAll(stopCh <-chan bool) (chan interface{}, chan error, error)
WatchAll(labelSelector string, stopCh <-chan bool) (chan interface{}, chan error, error)
}
type clientImpl struct {
@ -50,11 +51,26 @@ func NewClient(baseURL string, caCert []byte, token string) (Client, error) {
}, nil
}
// GetIngresses returns all ingresses in the cluster
func (c *clientImpl) GetIngresses(predicate func(Ingress) bool) ([]Ingress, error) {
getURL := c.endpointURL + extentionsEndpoint + defaultIngress
func makeQueryString(baseParams map[string]string, labelSelector string) (string, error) {
if labelSelector != "" {
baseParams["labelSelector"] = labelSelector
}
queryData, err := json.Marshal(baseParams)
if err != nil {
return "", err
}
return string(queryData), nil
}
body, err := c.do(c.request(getURL))
// GetIngresses returns all ingresses in the cluster
func (c *clientImpl) GetIngresses(labelSelector string, predicate func(Ingress) bool) ([]Ingress, error) {
getURL := c.endpointURL + extentionsEndpoint + defaultIngress
queryParams := map[string]string{}
queryData, err := makeQueryString(queryParams, labelSelector)
if err != nil {
return nil, fmt.Errorf("Had problems constructing query string %s : %v", queryParams, err)
}
body, err := c.do(c.request(getURL, queryData))
if err != nil {
return nil, fmt.Errorf("failed to create ingresses request: GET %q : %v", getURL, err)
}
@ -73,16 +89,16 @@ func (c *clientImpl) GetIngresses(predicate func(Ingress) bool) ([]Ingress, erro
}
// WatchIngresses returns all ingresses in the cluster
func (c *clientImpl) WatchIngresses(stopCh <-chan bool) (chan interface{}, chan error, error) {
func (c *clientImpl) WatchIngresses(labelSelector string, stopCh <-chan bool) (chan interface{}, chan error, error) {
getURL := c.endpointURL + extentionsEndpoint + defaultIngress
return c.watch(getURL, stopCh)
return c.watch(getURL, labelSelector, stopCh)
}
// GetService returns the named service from the named namespace
func (c *clientImpl) GetService(name, namespace string) (Service, error) {
getURL := c.endpointURL + APIEndpoint + namespaces + namespace + "/services/" + name
body, err := c.do(c.request(getURL))
body, err := c.do(c.request(getURL, ""))
if err != nil {
return Service{}, fmt.Errorf("failed to create services request: GET %q : %v", getURL, err)
}
@ -95,9 +111,9 @@ func (c *clientImpl) GetService(name, namespace string) (Service, error) {
}
// WatchServices returns all services in the cluster
func (c *clientImpl) WatchServices(stopCh <-chan bool) (chan interface{}, chan error, error) {
func (c *clientImpl) WatchServices(labelSelector string, stopCh <-chan bool) (chan interface{}, chan error, error) {
getURL := c.endpointURL + APIEndpoint + "/services"
return c.watch(getURL, stopCh)
return c.watch(getURL, labelSelector, stopCh)
}
// GetEndpoints returns the named Endpoints
@ -105,7 +121,7 @@ func (c *clientImpl) WatchServices(stopCh <-chan bool) (chan interface{}, chan e
func (c *clientImpl) GetEndpoints(name, namespace string) (Endpoints, error) {
getURL := c.endpointURL + APIEndpoint + namespaces + namespace + "/endpoints/" + name
body, err := c.do(c.request(getURL))
body, err := c.do(c.request(getURL, ""))
if err != nil {
return Endpoints{}, fmt.Errorf("failed to create endpoints request: GET %q : %v", getURL, err)
}
@ -118,28 +134,28 @@ func (c *clientImpl) GetEndpoints(name, namespace string) (Endpoints, error) {
}
// WatchEndpoints returns endpoints in the cluster
func (c *clientImpl) WatchEndpoints(stopCh <-chan bool) (chan interface{}, chan error, error) {
func (c *clientImpl) WatchEndpoints(labelSelector string, stopCh <-chan bool) (chan interface{}, chan error, error) {
getURL := c.endpointURL + APIEndpoint + "/endpoints"
return c.watch(getURL, stopCh)
return c.watch(getURL, labelSelector, stopCh)
}
// WatchAll returns events in the cluster
func (c *clientImpl) WatchAll(stopCh <-chan bool) (chan interface{}, chan error, error) {
func (c *clientImpl) WatchAll(labelSelector string, stopCh <-chan bool) (chan interface{}, chan error, error) {
watchCh := make(chan interface{}, 10)
errCh := make(chan error, 10)
stopIngresses := make(chan bool)
chanIngresses, chanIngressesErr, err := c.WatchIngresses(stopIngresses)
chanIngresses, chanIngressesErr, err := c.WatchIngresses(labelSelector, stopIngresses)
if err != nil {
return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
}
stopServices := make(chan bool)
chanServices, chanServicesErr, err := c.WatchServices(stopServices)
chanServices, chanServicesErr, err := c.WatchServices(labelSelector, stopServices)
if err != nil {
return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
}
stopEndpoints := make(chan bool)
chanEndpoints, chanEndpointsErr, err := c.WatchEndpoints(stopEndpoints)
chanEndpoints, chanEndpointsErr, err := c.WatchEndpoints(labelSelector, stopEndpoints)
if err != nil {
return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
}
@ -188,22 +204,26 @@ func (c *clientImpl) do(request *gorequest.SuperAgent) ([]byte, error) {
return body, nil
}
func (c *clientImpl) request(url string) *gorequest.SuperAgent {
func (c *clientImpl) request(reqURL string, queryContent interface{}) *gorequest.SuperAgent {
// Make request to Kubernetes API
request := gorequest.New().Get(url)
parsedURL, parseErr := url.Parse(reqURL)
if parseErr != nil {
log.Errorf("Had issues parsing url %s. Trying anyway.", reqURL)
}
request := gorequest.New().Get(reqURL)
request.Transport.DisableKeepAlives = true
if strings.HasPrefix(url, "http://") {
return request
}
if len(c.token) > 0 {
request.Header["Authorization"] = "Bearer " + c.token
if parsedURL.Scheme == "https" {
pool := x509.NewCertPool()
pool.AppendCertsFromPEM(c.caCert)
c.tls = &tls.Config{RootCAs: pool}
request.TLSClientConfig(c.tls)
}
return request.TLSClientConfig(c.tls)
if len(c.token) > 0 {
request.Header["Authorization"] = "Bearer " + c.token
}
request.Query(queryContent)
return request
}
// GenericObject generic object
@ -212,12 +232,12 @@ type GenericObject struct {
ListMeta `json:"metadata,omitempty"`
}
func (c *clientImpl) watch(url string, stopCh <-chan bool) (chan interface{}, chan error, error) {
func (c *clientImpl) watch(url string, labelSelector string, stopCh <-chan bool) (chan interface{}, chan error, error) {
watchCh := make(chan interface{}, 10)
errCh := make(chan error, 10)
// get version
body, err := c.do(c.request(url))
body, err := c.do(c.request(url, ""))
if err != nil {
return watchCh, errCh, fmt.Errorf("failed to do version request: GET %q : %v", url, err)
}
@ -227,10 +247,12 @@ func (c *clientImpl) watch(url string, stopCh <-chan bool) (chan interface{}, ch
return watchCh, errCh, fmt.Errorf("failed to decode version %v", err)
}
resourceVersion := generic.ResourceVersion
url = url + "?watch&resourceVersion=" + resourceVersion
// Make request to Kubernetes API
request := c.request(url)
queryParams := map[string]string{"watch": "", "resourceVersion": resourceVersion}
queryData, err := makeQueryString(queryParams, labelSelector)
if err != nil {
return watchCh, errCh, fmt.Errorf("Unable to construct query args")
}
request := c.request(url, queryData)
req, err := request.MakeRequest()
if err != nil {
return watchCh, errCh, fmt.Errorf("failed to make watch request: GET %q : %v", url, err)

15
provider/kubernetes.go
View file

@ -20,6 +20,7 @@ import (
const (
serviceAccountToken = "/var/run/secrets/kubernetes.io/serviceaccount/token"
serviceAccountCACert = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
defaultKubeEndpoint = "http://127.0.0.1:8080"
)
// Namespaces holds kubernetes namespaces
@ -54,6 +55,7 @@ type Kubernetes struct {
Endpoint string `description:"Kubernetes server endpoint"`
DisablePassHostHeaders bool `description:"Kubernetes disable PassHost Headers"`
Namespaces Namespaces `description:"Kubernetes namespaces"`
LabelSelector string `description:"Kubernetes api label selector to use"`
lastConfiguration safe.Safe
}
@ -74,9 +76,15 @@ func (provider *Kubernetes) createClient() (k8s.Client, error) {
}
kubernetesHost := os.Getenv("KUBERNETES_SERVICE_HOST")
kubernetesPort := os.Getenv("KUBERNETES_SERVICE_PORT_HTTPS")
if len(kubernetesPort) > 0 && len(kubernetesHost) > 0 {
// Prioritize user provided kubernetes endpoint since kube container runtime will almost always have it
if provider.Endpoint == "" && len(kubernetesPort) > 0 && len(kubernetesHost) > 0 {
log.Debugf("Using environment provided kubernetes endpoint")
provider.Endpoint = "https://" + kubernetesHost + ":" + kubernetesPort
}
if provider.Endpoint == "" {
log.Debugf("Using default kubernetes api endpoint")
provider.Endpoint = defaultKubeEndpoint
}
log.Debugf("Kubernetes endpoint: %s", provider.Endpoint)
return k8s.NewClient(provider.Endpoint, caCert, token)
}
@ -96,7 +104,8 @@ func (provider *Kubernetes) Provide(configurationChan chan<- types.ConfigMessage
for {
stopWatch := make(chan bool, 5)
defer close(stopWatch)
eventsChan, errEventsChan, err := k8sClient.WatchAll(stopWatch)
log.Debugf("Using lable selector: %s", provider.LabelSelector)
eventsChan, errEventsChan, err := k8sClient.WatchAll(provider.LabelSelector, stopWatch)
if err != nil {
log.Errorf("Error watching kubernetes events: %v", err)
timer := time.NewTimer(1 * time.Second)
@ -167,7 +176,7 @@ func (provider *Kubernetes) Provide(configurationChan chan<- types.ConfigMessage
}
func (provider *Kubernetes) loadIngresses(k8sClient k8s.Client) (*types.Configuration, error) {
ingresses, err := k8sClient.GetIngresses(func(ingress k8s.Ingress) bool {
ingresses, err := k8sClient.GetIngresses(provider.LabelSelector, func(ingress k8s.Ingress) bool {
if len(provider.Namespaces) == 0 {
return true
}

6
provider/kubernetes_test.go
View file

@ -1250,7 +1250,7 @@ type clientMock struct {
watchChan chan interface{}
}
func (c clientMock) GetIngresses(predicate func(k8s.Ingress) bool) ([]k8s.Ingress, error) {
func (c clientMock) GetIngresses(labelString string, predicate func(k8s.Ingress) bool) ([]k8s.Ingress, error) {
var ingresses []k8s.Ingress
for _, ingress := range c.ingresses {
if predicate(ingress) {
@ -1259,7 +1259,7 @@ func (c clientMock) GetIngresses(predicate func(k8s.Ingress) bool) ([]k8s.Ingres
}
return ingresses, nil
}
func (c clientMock) WatchIngresses(predicate func(k8s.Ingress) bool, stopCh <-chan bool) (chan interface{}, chan error, error) {
func (c clientMock) WatchIngresses(labelString string, predicate func(k8s.Ingress) bool, stopCh <-chan bool) (chan interface{}, chan error, error) {
return c.watchChan, make(chan error), nil
}
func (c clientMock) GetService(name, namespace string) (k8s.Service, error) {
@ -1280,6 +1280,6 @@ func (c clientMock) GetEndpoints(name, namespace string) (k8s.Endpoints, error)
return k8s.Endpoints{}, nil
}
func (c clientMock) WatchAll(stopCh <-chan bool) (chan interface{}, chan error, error) {
func (c clientMock) WatchAll(labelString string, stopCh <-chan bool) (chan interface{}, chan error, error) {
return c.watchChan, make(chan error), nil
}

3
traefik.sample.toml
View file

@ -345,6 +345,9 @@
#
# endpoint = "http://localhost:8080"
# namespaces = ["default"]
#
# See: http://kubernetes.io/docs/user-guide/labels/#list-and-watch-filtering
# labelselector = "A and not B"
################################################################
# Consul KV configuration backend