/* Copyright 2014 Google Inc. All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package kubelet import ( "encoding/json" "errors" "fmt" "io" "io/ioutil" "net" "net/http" "net/url" "path" "strconv" "strings" "time" "github.com/GoogleCloudPlatform/kubernetes/pkg/api" "github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest" "github.com/GoogleCloudPlatform/kubernetes/pkg/healthz" "github.com/GoogleCloudPlatform/kubernetes/pkg/httplog" "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/dockertools" "github.com/golang/glog" "github.com/google/cadvisor/info" "gopkg.in/v1/yaml" ) // Server is a http.Handler which exposes kubelet functionality over HTTP. type Server struct { host HostInterface updates chan<- interface{} mux *http.ServeMux } // ListenAndServeKubeletServer initializes a server to respond to HTTP network requests on the Kubelet. func ListenAndServeKubeletServer(host HostInterface, updates chan<- interface{}, address net.IP, port uint, enableDebuggingHandlers bool) { glog.V(1).Infof("Starting to listen on %s:%d", address, port) handler := NewServer(host, updates, enableDebuggingHandlers) s := &http.Server{ Addr: net.JoinHostPort(address.String(), strconv.FormatUint(uint64(port), 10)), Handler: &handler, ReadTimeout: 5 * time.Minute, WriteTimeout: 5 * time.Minute, MaxHeaderBytes: 1 << 20, } glog.Fatal(s.ListenAndServe()) } // HostInterface contains all the kubelet methods required by the server. // For testablitiy. type HostInterface interface { GetContainerInfo(podFullName, uuid, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error) GetRootInfo(req *info.ContainerInfoRequest) (*info.ContainerInfo, error) GetMachineInfo() (*info.MachineInfo, error) GetBoundPods() ([]api.BoundPod, error) GetPodInfo(name, uuid string) (api.PodInfo, error) RunInContainer(name, uuid, container string, cmd []string) ([]byte, error) GetKubeletContainerLogs(podFullName, containerName, tail string, follow bool, stdout, stderr io.Writer) error ServeLogs(w http.ResponseWriter, req *http.Request) } // NewServer initializes and configures a kubelet.Server object to handle HTTP requests. func NewServer(host HostInterface, updates chan<- interface{}, enableDebuggingHandlers bool) Server { server := Server{ host: host, updates: updates, mux: http.NewServeMux(), } server.InstallDefaultHandlers() if enableDebuggingHandlers { server.InstallDebuggingHandlers() } return server } // InstallDefaultHandlers registers the default set of supported HTTP request patterns with the mux. func (s *Server) InstallDefaultHandlers() { healthz.InstallHandler(s.mux) s.mux.HandleFunc("/podInfo", s.handlePodInfo) s.mux.HandleFunc("/boundPods", s.handleBoundPods) s.mux.HandleFunc("/stats/", s.handleStats) s.mux.HandleFunc("/spec/", s.handleSpec) } // InstallDeguggingHandlers registers the HTTP request patterns that serve logs or run commands/containers func (s *Server) InstallDebuggingHandlers() { // ToDo: /container, /run, and /containers aren't debugging options, should probably be handled separately s.mux.HandleFunc("/container", s.handleContainer) s.mux.HandleFunc("/containers", s.handleContainers) s.mux.HandleFunc("/run/", s.handleRun) s.mux.HandleFunc("/logs/", s.handleLogs) s.mux.HandleFunc("/containerLogs/", s.handleContainerLogs) } // error serializes an error object into an HTTP response. func (s *Server) error(w http.ResponseWriter, err error) { http.Error(w, fmt.Sprintf("Internal Error: %v", err), http.StatusInternalServerError) } // handleContainer handles container requests against the Kubelet. func (s *Server) handleContainer(w http.ResponseWriter, req *http.Request) { defer req.Body.Close() data, err := ioutil.ReadAll(req.Body) if err != nil { s.error(w, err) return } // This is to provide backward compatibility. It only supports a single manifest var pod api.BoundPod var containerManifest api.ContainerManifest err = yaml.Unmarshal(data, &containerManifest) if err != nil { s.error(w, err) return } pod.Name = containerManifest.ID pod.UID = containerManifest.UUID pod.Spec.Containers = containerManifest.Containers pod.Spec.Volumes = containerManifest.Volumes pod.Spec.RestartPolicy = containerManifest.RestartPolicy //TODO: sha1 of manifest? if pod.Name == "" { pod.Name = "1" } if pod.UID == "" { pod.UID = "1" } s.updates <- PodUpdate{[]api.BoundPod{pod}, SET} } // handleContainers handles containers requests against the Kubelet. func (s *Server) handleContainers(w http.ResponseWriter, req *http.Request) { defer req.Body.Close() data, err := ioutil.ReadAll(req.Body) if err != nil { s.error(w, err) return } var specs []api.PodSpec err = yaml.Unmarshal(data, &specs) if err != nil { s.error(w, err) return } pods := make([]api.BoundPod, len(specs)) for i := range specs { pods[i].Name = fmt.Sprintf("%d", i+1) pods[i].Spec = specs[i] } s.updates <- PodUpdate{pods, SET} } // handleContainerLogs handles containerLogs request against the Kubelet func (s *Server) handleContainerLogs(w http.ResponseWriter, req *http.Request) { defer req.Body.Close() u, err := url.ParseRequestURI(req.RequestURI) if err != nil { s.error(w, err) return } parts := strings.Split(u.Path, "/") // req URI: /containerLogs/// var podNamespace, podID, containerName string if len(parts) == 5 { podNamespace = parts[2] podID = parts[3] containerName = parts[4] } else { http.Error(w, "Unexpected path for command running", http.StatusBadRequest) return } if len(podID) == 0 { http.Error(w, `{"message": "Missing podID."}`, http.StatusBadRequest) return } if len(containerName) == 0 { http.Error(w, `{"message": "Missing container name."}`, http.StatusBadRequest) return } if len(podNamespace) == 0 { http.Error(w, `{"message": "Missing podNamespace."}`, http.StatusBadRequest) return } uriValues := u.Query() follow, _ := strconv.ParseBool(uriValues.Get("follow")) tail := uriValues.Get("tail") podFullName := GetPodFullName(&api.BoundPod{ ObjectMeta: api.ObjectMeta{ Name: podID, Namespace: podNamespace, Annotations: map[string]string{ConfigSourceAnnotationKey: "etcd"}, }, }) fw := FlushWriter{writer: w} if flusher, ok := fw.writer.(http.Flusher); ok { fw.flusher = flusher } else { s.error(w, fmt.Errorf("Unable to convert %v into http.Flusher", fw)) } w.Header().Set("Transfer-Encoding", "chunked") w.WriteHeader(http.StatusOK) err = s.host.GetKubeletContainerLogs(podFullName, containerName, tail, follow, &fw, &fw) if err != nil { s.error(w, err) return } } // handleBoundPods returns a list of pod bound to the Kubelet and their spec func (s *Server) handleBoundPods(w http.ResponseWriter, req *http.Request) { pods, err := s.host.GetBoundPods() if err != nil { s.error(w, err) return } boundPods := &api.BoundPods{ Items: pods, } data, err := latest.Codec.Encode(boundPods) if err != nil { s.error(w, err) return } w.WriteHeader(http.StatusOK) w.Header().Add("Content-type", "application/json") w.Write(data) } // handlePodInfo handles podInfo requests against the Kubelet func (s *Server) handlePodInfo(w http.ResponseWriter, req *http.Request) { u, err := url.ParseRequestURI(req.RequestURI) if err != nil { s.error(w, err) return } podID := u.Query().Get("podID") podUUID := u.Query().Get("UUID") podNamespace := u.Query().Get("podNamespace") if len(podID) == 0 { w.WriteHeader(http.StatusBadRequest) http.Error(w, "Missing 'podID=' query entry.", http.StatusBadRequest) return } if len(podNamespace) == 0 { w.WriteHeader(http.StatusBadRequest) http.Error(w, "Missing 'podNamespace=' query entry.", http.StatusBadRequest) return } // TODO: backwards compatibility with existing API, needs API change podFullName := GetPodFullName(&api.BoundPod{ ObjectMeta: api.ObjectMeta{ Name: podID, Namespace: podNamespace, Annotations: map[string]string{ConfigSourceAnnotationKey: "etcd"}, }, }) info, err := s.host.GetPodInfo(podFullName, podUUID) if err == dockertools.ErrNoContainersInPod { http.Error(w, "api.BoundPod does not exist", http.StatusNotFound) return } if err != nil { s.error(w, err) return } data, err := json.Marshal(info) if err != nil { s.error(w, err) return } w.WriteHeader(http.StatusOK) w.Header().Add("Content-type", "application/json") w.Write(data) } // handleStats handles stats requests against the Kubelet. func (s *Server) handleStats(w http.ResponseWriter, req *http.Request) { s.serveStats(w, req) } // handleLogs handles logs requests against the Kubelet. func (s *Server) handleLogs(w http.ResponseWriter, req *http.Request) { s.host.ServeLogs(w, req) } // handleSpec handles spec requests against the Kubelet. func (s *Server) handleSpec(w http.ResponseWriter, req *http.Request) { info, err := s.host.GetMachineInfo() if err != nil { s.error(w, err) return } data, err := json.Marshal(info) if err != nil { s.error(w, err) return } w.Header().Add("Content-type", "application/json") w.Write(data) } // handleRun handles requests to run a command inside a container. func (s *Server) handleRun(w http.ResponseWriter, req *http.Request) { u, err := url.ParseRequestURI(req.RequestURI) if err != nil { s.error(w, err) return } parts := strings.Split(u.Path, "/") var podNamespace, podID, uuid, container string if len(parts) == 5 { podNamespace = parts[2] podID = parts[3] container = parts[4] } else if len(parts) == 6 { podNamespace = parts[2] podID = parts[3] uuid = parts[4] container = parts[5] } else { http.Error(w, "Unexpected path for command running", http.StatusBadRequest) return } podFullName := GetPodFullName(&api.BoundPod{ ObjectMeta: api.ObjectMeta{ Name: podID, Namespace: podNamespace, Annotations: map[string]string{ConfigSourceAnnotationKey: "etcd"}, }, }) command := strings.Split(u.Query().Get("cmd"), " ") data, err := s.host.RunInContainer(podFullName, uuid, container, command) if err != nil { s.error(w, err) return } w.Header().Add("Content-type", "text/plain") w.Write(data) } // ServeHTTP responds to HTTP requests on the Kubelet. func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) { defer httplog.NewLogged(req, &w).StacktraceWhen( httplog.StatusIsNot( http.StatusOK, http.StatusNotFound, ), ).Log() s.mux.ServeHTTP(w, req) } // serveStats implements stats logic. func (s *Server) serveStats(w http.ResponseWriter, req *http.Request) { // /stats// or /stats/// components := strings.Split(strings.TrimPrefix(path.Clean(req.URL.Path), "/"), "/") var stats *info.ContainerInfo var err error var query info.ContainerInfoRequest err = json.NewDecoder(req.Body).Decode(&query) if err != nil && err != io.EOF { s.error(w, err) return } switch len(components) { case 1: // Machine stats stats, err = s.host.GetRootInfo(&query) case 2: // pod stats // TODO(monnand) Implement this errors.New("pod level status currently unimplemented") case 3: // Backward compatibility without uuid information podFullName := GetPodFullName(&api.BoundPod{ ObjectMeta: api.ObjectMeta{ Name: components[1], // TODO: I am broken Namespace: api.NamespaceDefault, Annotations: map[string]string{ConfigSourceAnnotationKey: "etcd"}, }, }) stats, err = s.host.GetContainerInfo(podFullName, "", components[2], &query) case 4: podFullName := GetPodFullName(&api.BoundPod{ ObjectMeta: api.ObjectMeta{ Name: components[1], // TODO: I am broken Namespace: "", Annotations: map[string]string{ConfigSourceAnnotationKey: "etcd"}, }, }) stats, err = s.host.GetContainerInfo(podFullName, components[2], components[2], &query) default: http.Error(w, "unknown resource.", http.StatusNotFound) return } if err != nil { s.error(w, err) return } if stats == nil { w.WriteHeader(http.StatusOK) fmt.Fprint(w, "{}") return } data, err := json.Marshal(stats) if err != nil { s.error(w, err) return } w.WriteHeader(http.StatusOK) w.Header().Add("Content-type", "application/json") w.Write(data) return }