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|
package kubernetes
import (
"context"
"fmt"
"io"
"net/http"
"strconv"
"github.com/gorilla/websocket"
"github.com/sirupsen/logrus"
terminal "gitlab.com/gitlab-org/gitlab-terminal"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8net "k8s.io/apimachinery/pkg/util/net"
"k8s.io/client-go/rest"
"gitlab.com/gitlab-org/gitlab-runner/session/proxy"
)
const runningState = "Running"
func (s *executor) Pool() proxy.Pool {
return s.ProxyPool
}
func (s *executor) newProxy(serviceName string, ports []proxy.Port) *proxy.Proxy {
return &proxy.Proxy{
Settings: proxy.NewProxySettings(serviceName, ports),
ConnectionHandler: s,
}
}
func (s *executor) ProxyRequest(
w http.ResponseWriter,
r *http.Request,
requestedURI string,
port string,
settings *proxy.Settings,
) {
logger := logrus.WithFields(logrus.Fields{
"uri": r.RequestURI,
"method": r.Method,
"port": port,
"settings": settings,
})
portSettings, err := settings.PortByNameOrNumber(port)
if err != nil {
logger.WithError(err).Errorf("port proxy %q not found", port)
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
return
}
if !s.servicesRunning() {
logger.Errorf("services are not ready yet")
http.Error(w, http.StatusText(http.StatusServiceUnavailable), http.StatusServiceUnavailable)
return
}
if websocket.IsWebSocketUpgrade(r) {
proxyWSRequest(s, w, r, requestedURI, portSettings, settings, logger)
return
}
proxyHTTPRequest(s, w, r, requestedURI, portSettings, settings, logger)
}
func (s *executor) servicesRunning() bool {
// TODO: handle the context properly with https://gitlab.com/gitlab-org/gitlab-runner/-/issues/27932
pod, err := s.kubeClient.CoreV1().Pods(s.pod.Namespace).Get(context.TODO(), s.pod.Name, metav1.GetOptions{})
if err != nil || pod.Status.Phase != runningState {
return false
}
for _, container := range pod.Status.ContainerStatuses {
if !container.Ready {
return false
}
}
return true
}
func (s *executor) serviceEndpointRequest(
verb, serviceName, requestedURI string,
port proxy.Port,
) (*rest.Request, error) {
scheme, err := port.Scheme()
if err != nil {
return nil, err
}
result := s.kubeClient.CoreV1().RESTClient().Verb(verb).
Namespace(s.pod.Namespace).
Resource("services").
SubResource("proxy").
Name(k8net.JoinSchemeNamePort(scheme, serviceName, strconv.Itoa(port.Number))).
Suffix(requestedURI)
return result, nil
}
func proxyWSRequest(
s *executor,
w http.ResponseWriter,
r *http.Request,
requestedURI string,
port proxy.Port,
proxySettings *proxy.Settings,
logger *logrus.Entry,
) {
// In order to avoid calling this method, and use one of its own,
// we should refactor the library "gitlab.com/gitlab-org/gitlab-terminal"
// and make it more generic, not so terminal focused, with a broader
// terminology. (https://gitlab.com/gitlab-org/gitlab-runner/issues/4059)
settings, err := s.getTerminalSettings()
if err != nil {
logger.WithError(err).Errorf("service proxy: error getting WS settings")
http.Error(w, http.StatusText(http.StatusServiceUnavailable), http.StatusServiceUnavailable)
return
}
req, err := s.serviceEndpointRequest(r.Method, proxySettings.ServiceName, requestedURI, port)
if err != nil {
logger.WithError(err).Errorf("service proxy: error proxying WS request")
http.Error(w, http.StatusText(http.StatusServiceUnavailable), http.StatusServiceUnavailable)
return
}
u := req.URL()
u.Scheme = proxy.WebsocketProtocolFor(u.Scheme)
settings.Url = u.String()
serviceProxy := terminal.NewWebSocketProxy(1)
terminal.ProxyWebSocket(w, r, settings, serviceProxy)
}
func proxyHTTPRequest(
s *executor,
w http.ResponseWriter,
r *http.Request,
requestedURI string,
port proxy.Port,
proxy *proxy.Settings,
logger *logrus.Entry,
) {
req, err := s.serviceEndpointRequest(r.Method, proxy.ServiceName, requestedURI, port)
if err != nil {
logger.WithError(err).Errorf("service proxy: error proxying HTTP request")
http.Error(w, http.StatusText(http.StatusServiceUnavailable), http.StatusServiceUnavailable)
return
}
// TODO: handle the context properly with https://gitlab.com/gitlab-org/gitlab-runner/-/issues/27932
body, err := req.Stream(context.TODO())
if err != nil {
message, code := handleProxyHTTPErr(err, logger)
w.WriteHeader(code)
if message != "" {
_, _ = fmt.Fprint(w, message)
}
return
}
w.WriteHeader(http.StatusOK)
_, _ = io.Copy(w, body)
}
func handleProxyHTTPErr(err error, logger *logrus.Entry) (string, int) {
statusError, ok := err.(*errors.StatusError)
if !ok {
return "", http.StatusInternalServerError
}
code := int(statusError.Status().Code)
// When the error is a 503 we don't want to give any information
// coming from Kubernetes
if code == http.StatusServiceUnavailable {
logger.Error(statusError.Status().Message)
return "", code
}
details := statusError.Status().Details
if details == nil {
return "", code
}
causes := details.Causes
if len(causes) > 0 {
return causes[0].Message, code
}
return "", code
}
|
