func (r *RedirectHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
var verb string
var apiResource string
var httpCode int
reqStart := time.Now()
defer monitor("redirect", &verb, &apiResource, &httpCode, reqStart)
requestInfo, err := r.apiRequestInfoResolver.GetAPIRequestInfo(req)
if err != nil {
notFound(w, req)
httpCode = http.StatusNotFound
return
}
verb = requestInfo.Verb
resource, parts := requestInfo.Resource, requestInfo.Parts
ctx, ok := r.context.Get(req)
if !ok {
ctx = api.NewContext()
}
ctx = api.WithNamespace(ctx, requestInfo.Namespace)
// redirection requires /resource/resourceName path parts
if len(parts) != 2 || req.Method != "GET" {
notFound(w, req)
httpCode = http.StatusNotFound
return
}
id := parts[1]
storage, ok := r.storage[resource]
if !ok {
httplog.LogOf(req, w).Addf("'%v' has no storage object", resource)
notFound(w, req)
httpCode = http.StatusNotFound
return
}
apiResource = resource
redirector, ok := storage.(Redirector)
if !ok {
httplog.LogOf(req, w).Addf("'%v' is not a redirector", resource)
httpCode = errorJSON(errors.NewMethodNotSupported(resource, "redirect"), r.codec, w)
return
}
location, err := redirector.ResourceLocation(ctx, id)
if err != nil {
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w)
httpCode = status.Code
return
}
w.Header().Set("Location", fmt.Sprintf("http://%s", location))
w.WriteHeader(http.StatusTemporaryRedirect)
httpCode = http.StatusTemporaryRedirect
}
// ServeHTTP processes watch requests.
func (h *WatchHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if req.Method != "GET" {
notFound(w, req)
return
}
namespace, kind, _, err := KindAndNamespace(req)
if err != nil {
notFound(w, req)
return
}
ctx := api.WithNamespace(api.NewContext(), namespace)
storage := h.storage[kind]
if storage == nil {
notFound(w, req)
return
}
watcher, ok := storage.(ResourceWatcher)
if !ok {
errorJSON(errors.NewMethodNotSupported(kind, "watch"), h.codec, w)
return
}
label, field, resourceVersion, err := getWatchParams(req.URL.Query())
if err != nil {
errorJSON(err, h.codec, w)
return
}
watching, err := watcher.Watch(ctx, label, field, resourceVersion)
if err != nil {
errorJSON(err, h.codec, w)
return
}
// TODO: This is one watch per connection. We want to multiplex, so that
// multiple watches of the same thing don't create two watches downstream.
watchServer := &WatchServer{watching, h.codec, func(obj runtime.Object) {
if err := h.setSelfLinkAddName(obj, req); err != nil {
glog.Errorf("Failed to set self link for object %#v", obj)
}
}}
if isWebsocketRequest(req) {
websocket.Handler(watchServer.HandleWS).ServeHTTP(httplog.Unlogged(w), req)
} else {
watchServer.ServeHTTP(w, req)
}
}
func (r *RedirectHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
namespace, kind, parts, err := KindAndNamespace(req)
if err != nil {
notFound(w, req)
return
}
ctx := api.WithNamespace(api.NewContext(), namespace)
// redirection requires /kind/resourceName path parts
if len(parts) != 2 || req.Method != "GET" {
notFound(w, req)
return
}
id := parts[1]
storage, ok := r.storage[kind]
if !ok {
httplog.LogOf(req, w).Addf("'%v' has no storage object", kind)
notFound(w, req)
return
}
redirector, ok := storage.(Redirector)
if !ok {
httplog.LogOf(req, w).Addf("'%v' is not a redirector", kind)
errorJSON(errors.NewMethodNotSupported(kind, "redirect"), r.codec, w)
return
}
location, err := redirector.ResourceLocation(ctx, id)
if err != nil {
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w)
return
}
w.Header().Set("Location", location)
w.WriteHeader(http.StatusTemporaryRedirect)
}
// ServeHTTP processes watch requests.
func (h *WatchHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
var verb string
var apiResource string
var httpCode int
reqStart := time.Now()
defer monitor("watch", &verb, &apiResource, &httpCode, reqStart)
if req.Method != "GET" {
httpCode = errorJSON(errors.NewBadRequest(
fmt.Sprintf("unsupported method for watch: %s", req.Method)), h.codec, w)
return
}
requestInfo, err := h.info.GetAPIRequestInfo(req)
if err != nil {
httpCode = errorJSON(errors.NewBadRequest(
fmt.Sprintf("failed to find api request info: %s", err.Error())), h.codec, w)
return
}
verb = requestInfo.Verb
ctx := api.WithNamespace(api.NewContext(), requestInfo.Namespace)
storage := h.storage[requestInfo.Resource]
if storage == nil {
httpCode = errorJSON(errors.NewNotFound(requestInfo.Resource, "Resource"), h.codec, w)
return
}
apiResource = requestInfo.Resource
watcher, ok := storage.(ResourceWatcher)
if !ok {
httpCode = errorJSON(errors.NewMethodNotSupported(requestInfo.Resource, "watch"), h.codec, w)
return
}
label, field, err := parseSelectorQueryParams(req.URL.Query(), requestInfo.APIVersion, apiResource)
if err != nil {
httpCode = errorJSON(err, h.codec, w)
return
}
resourceVersion := req.URL.Query().Get("resourceVersion")
watching, err := watcher.Watch(ctx, label, field, resourceVersion)
if err != nil {
httpCode = errorJSON(err, h.codec, w)
return
}
httpCode = http.StatusOK
// TODO: This is one watch per connection. We want to multiplex, so that
// multiple watches of the same thing don't create two watches downstream.
watchServer := &WatchServer{watching, h.codec, func(obj runtime.Object) {
if err := h.setSelfLinkAddName(obj, req); err != nil {
glog.Errorf("Failed to set self link for object %#v", obj)
}
}}
if isWebsocketRequest(req) {
websocket.Handler(watchServer.HandleWS).ServeHTTP(httplog.Unlogged(w), req)
} else {
watchServer.ServeHTTP(w, req)
}
}
func (r *ProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
var verb string
var apiResource string
var httpCode int
reqStart := time.Now()
defer monitor("proxy", &verb, &apiResource, &httpCode, reqStart)
requestInfo, err := r.apiRequestInfoResolver.GetAPIRequestInfo(req)
if err != nil {
notFound(w, req)
httpCode = http.StatusNotFound
return
}
verb = requestInfo.Verb
namespace, resource, parts := requestInfo.Namespace, requestInfo.Resource, requestInfo.Parts
ctx, ok := r.context.Get(req)
if !ok {
ctx = api.NewContext()
}
ctx = api.WithNamespace(ctx, namespace)
if len(parts) < 2 {
notFound(w, req)
httpCode = http.StatusNotFound
return
}
id := parts[1]
rest := ""
if len(parts) > 2 {
proxyParts := parts[2:]
rest = strings.Join(proxyParts, "/")
if strings.HasSuffix(req.URL.Path, "/") {
// The original path had a trailing slash, which has been stripped
// by KindAndNamespace(). We should add it back because some
// servers (like etcd) require it.
rest = rest + "/"
}
}
storage, ok := r.storage[resource]
if !ok {
httplog.LogOf(req, w).Addf("'%v' has no storage object", resource)
notFound(w, req)
httpCode = http.StatusNotFound
return
}
apiResource = resource
redirector, ok := storage.(Redirector)
if !ok {
httplog.LogOf(req, w).Addf("'%v' is not a redirector", resource)
httpCode = errorJSON(errors.NewMethodNotSupported(resource, "proxy"), r.codec, w)
return
}
location, err := redirector.ResourceLocation(ctx, id)
if err != nil {
httplog.LogOf(req, w).Addf("Error getting ResourceLocation: %v", err)
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w)
httpCode = status.Code
return
}
destURL, err := url.Parse(location)
if err != nil {
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w)
httpCode = status.Code
return
}
if destURL.Scheme == "" {
// If no scheme was present in location, url.Parse sometimes mistakes
// hosts for paths.
destURL.Host = location
}
destURL.Path = rest
destURL.RawQuery = req.URL.RawQuery
newReq, err := http.NewRequest(req.Method, destURL.String(), req.Body)
if err != nil {
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w)
notFound(w, req)
httpCode = status.Code
return
}
httpCode = http.StatusOK
newReq.Header = req.Header
// TODO convert this entire proxy to an UpgradeAwareProxy similar to
// https://github.com/openshift/origin/blob/master/pkg/util/httpproxy/upgradeawareproxy.go.
// That proxy needs to be modified to support multiple backends, not just 1.
if r.tryUpgrade(w, req, newReq, destURL) {
return
}
proxy := httputil.NewSingleHostReverseProxy(&url.URL{Scheme: "http", Host: destURL.Host})
proxy.Transport = &proxyTransport{
proxyScheme: req.URL.Scheme,
proxyHost: req.URL.Host,
proxyPathPrepend: requestInfo.URLPath(),
}
proxy.FlushInterval = 200 * time.Millisecond
proxy.ServeHTTP(w, newReq)
}
func (r *ProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
namespace, kind, parts, err := KindAndNamespace(req)
if err != nil {
notFound(w, req)
return
}
ctx := api.WithNamespace(api.NewContext(), namespace)
if len(parts) < 2 {
notFound(w, req)
return
}
id := parts[1]
rest := ""
if len(parts) > 2 {
proxyParts := parts[2:]
rest = strings.Join(proxyParts, "/")
}
storage, ok := r.storage[kind]
if !ok {
httplog.LogOf(req, w).Addf("'%v' has no storage object", kind)
notFound(w, req)
return
}
redirector, ok := storage.(Redirector)
if !ok {
httplog.LogOf(req, w).Addf("'%v' is not a redirector", kind)
errorJSON(errors.NewMethodNotSupported(kind, "proxy"), r.codec, w)
return
}
location, err := redirector.ResourceLocation(ctx, id)
if err != nil {
httplog.LogOf(req, w).Addf("Error getting ResourceLocation: %v", err)
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w)
return
}
if location == "" {
httplog.LogOf(req, w).Addf("ResourceLocation for %v returned ''", id)
notFound(w, req)
return
}
destURL, err := url.Parse(location)
if err != nil {
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w)
return
}
if destURL.Scheme == "" {
// If no scheme was present in location, url.Parse sometimes mistakes
// hosts for paths.
destURL.Host = location
}
destURL.Path = rest
destURL.RawQuery = req.URL.RawQuery
newReq, err := http.NewRequest(req.Method, destURL.String(), req.Body)
if err != nil {
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w)
notFound(w, req)
return
}
newReq.Header = req.Header
proxy := httputil.NewSingleHostReverseProxy(&url.URL{Scheme: "http", Host: destURL.Host})
proxy.Transport = &proxyTransport{
proxyScheme: req.URL.Scheme,
proxyHost: req.URL.Host,
proxyPathPrepend: path.Join(r.prefix, "ns", namespace, kind, id),
}
proxy.FlushInterval = 200 * time.Millisecond
proxy.ServeHTTP(w, newReq)
}
// handleRESTStorage is the main dispatcher for a storage object. It switches on the HTTP method, and then
// on path length, according to the following table:
// Method Path Action
// GET /foo list
// GET /foo/bar get 'bar'
// POST /foo create
// PUT /foo/bar update 'bar'
// DELETE /foo/bar delete 'bar'
// Returns 404 if the method/pattern doesn't match one of these entries
// The s accepts several query parameters:
// sync=[false|true] Synchronous request (only applies to create, update, delete operations)
// timeout=<duration> Timeout for synchronous requests, only applies if sync=true
// labels=<label-selector> Used for filtering list operations
func (h *RESTHandler) handleRESTStorage(parts []string, req *http.Request, w http.ResponseWriter, storage RESTStorage, namespace, kind string) {
ctx := api.WithNamespace(api.NewContext(), namespace)
sync := req.URL.Query().Get("sync") == "true"
timeout := parseTimeout(req.URL.Query().Get("timeout"))
switch req.Method {
case "GET":
switch len(parts) {
case 1:
label, err := labels.ParseSelector(req.URL.Query().Get("labels"))
if err != nil {
errorJSON(err, h.codec, w)
return
}
field, err := labels.ParseSelector(req.URL.Query().Get("fields"))
if err != nil {
errorJSON(err, h.codec, w)
return
}
lister, ok := storage.(RESTLister)
if !ok {
errorJSON(errors.NewMethodNotSupported(kind, "list"), h.codec, w)
return
}
list, err := lister.List(ctx, label, field)
if err != nil {
errorJSON(err, h.codec, w)
return
}
if err := h.setSelfLink(list, req); err != nil {
errorJSON(err, h.codec, w)
return
}
writeJSON(http.StatusOK, h.codec, list, w)
case 2:
getter, ok := storage.(RESTGetter)
if !ok {
errorJSON(errors.NewMethodNotSupported(kind, "get"), h.codec, w)
return
}
item, err := getter.Get(ctx, parts[1])
if err != nil {
errorJSON(err, h.codec, w)
return
}
if err := h.setSelfLink(item, req); err != nil {
errorJSON(err, h.codec, w)
return
}
writeJSON(http.StatusOK, h.codec, item, w)
default:
notFound(w, req)
}
case "POST":
if len(parts) != 1 {
notFound(w, req)
return
}
creater, ok := storage.(RESTCreater)
if !ok {
errorJSON(errors.NewMethodNotSupported(kind, "create"), h.codec, w)
return
}
body, err := readBody(req)
if err != nil {
errorJSON(err, h.codec, w)
return
}
obj := storage.New()
err = h.codec.DecodeInto(body, obj)
if err != nil {
errorJSON(err, h.codec, w)
return
}
// invoke admission control
err = h.admissionControl.Admit(admission.NewAttributesRecord(obj, namespace, parts[0], "CREATE"))
if err != nil {
errorJSON(err, h.codec, w)
return
}
out, err := creater.Create(ctx, obj)
if err != nil {
errorJSON(err, h.codec, w)
return
}
op := h.createOperation(out, sync, timeout, curry(h.setSelfLinkAddName, req))
h.finishReq(op, req, w)
case "DELETE":
if len(parts) != 2 {
notFound(w, req)
return
}
deleter, ok := storage.(RESTDeleter)
if !ok {
errorJSON(errors.NewMethodNotSupported(kind, "delete"), h.codec, w)
return
}
// invoke admission control
err := h.admissionControl.Admit(admission.NewAttributesRecord(nil, namespace, parts[0], "DELETE"))
if err != nil {
errorJSON(err, h.codec, w)
return
}
out, err := deleter.Delete(ctx, parts[1])
if err != nil {
errorJSON(err, h.codec, w)
return
}
op := h.createOperation(out, sync, timeout, nil)
h.finishReq(op, req, w)
case "PUT":
if len(parts) != 2 {
notFound(w, req)
return
}
updater, ok := storage.(RESTUpdater)
if !ok {
errorJSON(errors.NewMethodNotSupported(kind, "create"), h.codec, w)
return
}
body, err := readBody(req)
if err != nil {
errorJSON(err, h.codec, w)
return
}
obj := storage.New()
err = h.codec.DecodeInto(body, obj)
if err != nil {
errorJSON(err, h.codec, w)
return
}
// invoke admission control
err = h.admissionControl.Admit(admission.NewAttributesRecord(obj, namespace, parts[0], "UPDATE"))
if err != nil {
errorJSON(err, h.codec, w)
return
}
out, err := updater.Update(ctx, obj)
if err != nil {
errorJSON(err, h.codec, w)
return
}
op := h.createOperation(out, sync, timeout, curry(h.setSelfLink, req))
h.finishReq(op, req, w)
default:
notFound(w, req)
}
}
func (r *ProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
proxyHandlerTraceID := rand.Int63()
var verb string
var apiResource string
var httpCode int
reqStart := time.Now()
defer metrics.Monitor(&verb, &apiResource, util.GetClient(req), &httpCode, reqStart)
requestInfo, err := r.apiRequestInfoResolver.GetAPIRequestInfo(req)
if err != nil {
notFound(w, req)
httpCode = http.StatusNotFound
return
}
verb = requestInfo.Verb
namespace, resource, parts := requestInfo.Namespace, requestInfo.Resource, requestInfo.Parts
ctx, ok := r.context.Get(req)
if !ok {
ctx = api.NewContext()
}
ctx = api.WithNamespace(ctx, namespace)
if len(parts) < 2 {
notFound(w, req)
httpCode = http.StatusNotFound
return
}
id := parts[1]
remainder := ""
if len(parts) > 2 {
proxyParts := parts[2:]
remainder = strings.Join(proxyParts, "/")
if strings.HasSuffix(req.URL.Path, "/") {
// The original path had a trailing slash, which has been stripped
// by KindAndNamespace(). We should add it back because some
// servers (like etcd) require it.
remainder = remainder + "/"
}
}
storage, ok := r.storage[resource]
if !ok {
httplog.LogOf(req, w).Addf("'%v' has no storage object", resource)
notFound(w, req)
httpCode = http.StatusNotFound
return
}
apiResource = resource
redirector, ok := storage.(rest.Redirector)
if !ok {
httplog.LogOf(req, w).Addf("'%v' is not a redirector", resource)
httpCode = errorJSON(errors.NewMethodNotSupported(resource, "proxy"), r.codec, w)
return
}
location, roundTripper, err := redirector.ResourceLocation(ctx, id)
if err != nil {
httplog.LogOf(req, w).Addf("Error getting ResourceLocation: %v", err)
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w, true)
httpCode = status.Code
return
}
if location == nil {
httplog.LogOf(req, w).Addf("ResourceLocation for %v returned nil", id)
notFound(w, req)
httpCode = http.StatusNotFound
return
}
// If we have a custom dialer, and no pre-existing transport, initialize it to use the dialer.
if roundTripper == nil && r.dial != nil {
glog.V(5).Infof("[%x: %v] making a dial-only transport...", proxyHandlerTraceID, req.URL)
roundTripper = &http.Transport{Dial: r.dial}
} else if roundTripper != nil {
glog.V(5).Infof("[%x: %v] using transport %T...", proxyHandlerTraceID, req.URL, roundTripper)
}
// Default to http
if location.Scheme == "" {
location.Scheme = "http"
}
// Add the subpath
if len(remainder) > 0 {
location.Path = singleJoiningSlash(location.Path, remainder)
}
// Start with anything returned from the storage, and add the original request's parameters
values := location.Query()
for k, vs := range req.URL.Query() {
for _, v := range vs {
values.Add(k, v)
}
}
location.RawQuery = values.Encode()
newReq, err := http.NewRequest(req.Method, location.String(), req.Body)
if err != nil {
status := errToAPIStatus(err)
writeJSON(status.Code, r.codec, status, w, true)
notFound(w, req)
httpCode = status.Code
return
}
httpCode = http.StatusOK
newReq.Header = req.Header
// TODO convert this entire proxy to an UpgradeAwareProxy similar to
// https://github.com/openshift/origin/blob/master/pkg/util/httpproxy/upgradeawareproxy.go.
// That proxy needs to be modified to support multiple backends, not just 1.
if r.tryUpgrade(w, req, newReq, location, roundTripper) {
return
}
// Redirect requests of the form "/{resource}/{name}" to "/{resource}/{name}/"
// This is essentially a hack for https://github.com/GoogleCloudPlatform/kubernetes/issues/4958.
// Note: Keep this code after tryUpgrade to not break that flow.
if len(parts) == 2 && !strings.HasSuffix(req.URL.Path, "/") {
var queryPart string
if len(req.URL.RawQuery) > 0 {
queryPart = "?" + req.URL.RawQuery
}
w.Header().Set("Location", req.URL.Path+"/"+queryPart)
w.WriteHeader(http.StatusMovedPermanently)
return
}
start := time.Now()
glog.V(4).Infof("[%x] Beginning proxy %s...", proxyHandlerTraceID, req.URL)
defer func() {
glog.V(4).Infof("[%x] Proxy %v finished %v.", proxyHandlerTraceID, req.URL, time.Now().Sub(start))
}()
proxy := httputil.NewSingleHostReverseProxy(&url.URL{Scheme: location.Scheme, Host: location.Host})
alreadyRewriting := false
if roundTripper != nil {
_, alreadyRewriting = roundTripper.(*proxyutil.Transport)
glog.V(5).Infof("[%x] Not making a reriting transport for proxy %s...", proxyHandlerTraceID, req.URL)
}
if !alreadyRewriting {
glog.V(5).Infof("[%x] making a transport for proxy %s...", proxyHandlerTraceID, req.URL)
prepend := path.Join(r.prefix, resource, id)
if len(namespace) > 0 {
prepend = path.Join(r.prefix, "namespaces", namespace, resource, id)
}
pTransport := &proxyutil.Transport{
Scheme: req.URL.Scheme,
Host: req.URL.Host,
PathPrepend: prepend,
RoundTripper: roundTripper,
}
roundTripper = pTransport
}
proxy.Transport = roundTripper
proxy.FlushInterval = 200 * time.Millisecond
proxy.ServeHTTP(w, newReq)
}
