mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-22 13:00:19 +00:00
288 lines
10 KiB
Go
288 lines
10 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package handlers
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import (
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"context"
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"fmt"
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"math/rand"
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"net/http"
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"net/url"
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"strings"
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"time"
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"go.opentelemetry.io/otel/attribute"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
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metainternalversionscheme "k8s.io/apimachinery/pkg/apis/meta/internalversion/scheme"
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metainternalversionvalidation "k8s.io/apimachinery/pkg/apis/meta/internalversion/validation"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
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"k8s.io/apiserver/pkg/endpoints/metrics"
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"k8s.io/apiserver/pkg/endpoints/request"
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"k8s.io/apiserver/pkg/features"
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"k8s.io/apiserver/pkg/registry/rest"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/component-base/tracing"
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"k8s.io/klog/v2"
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)
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// getterFunc performs a get request with the given context and object name. The request
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// may be used to deserialize an options object to pass to the getter.
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type getterFunc func(ctx context.Context, name string, req *http.Request) (runtime.Object, error)
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// getResourceHandler is an HTTP handler function for get requests. It delegates to the
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// passed-in getterFunc to perform the actual get.
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func getResourceHandler(scope *RequestScope, getter getterFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, req *http.Request) {
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ctx := req.Context()
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ctx, span := tracing.Start(ctx, "Get", traceFields(req)...)
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defer span.End(500 * time.Millisecond)
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namespace, name, err := scope.Namer.Name(req)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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ctx = request.WithNamespace(ctx, namespace)
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outputMediaType, _, err := negotiation.NegotiateOutputMediaType(req, scope.Serializer, scope)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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result, err := getter(ctx, name, req)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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span.AddEvent("About to write a response")
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defer span.AddEvent("Writing http response done")
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transformResponseObject(ctx, scope, req, w, http.StatusOK, outputMediaType, result)
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}
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}
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// GetResource returns a function that handles retrieving a single resource from a rest.Storage object.
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func GetResource(r rest.Getter, scope *RequestScope) http.HandlerFunc {
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return getResourceHandler(scope,
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func(ctx context.Context, name string, req *http.Request) (runtime.Object, error) {
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// check for export
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options := metav1.GetOptions{}
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if values := req.URL.Query(); len(values) > 0 {
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if len(values["export"]) > 0 {
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exportBool := true
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exportStrings := values["export"]
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err := runtime.Convert_Slice_string_To_bool(&exportStrings, &exportBool, nil)
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if err != nil {
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return nil, errors.NewBadRequest(fmt.Sprintf("the export parameter cannot be parsed: %v", err))
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}
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if exportBool {
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return nil, errors.NewBadRequest("the export parameter, deprecated since v1.14, is no longer supported")
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}
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}
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if err := metainternalversionscheme.ParameterCodec.DecodeParameters(values, scope.MetaGroupVersion, &options); err != nil {
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err = errors.NewBadRequest(err.Error())
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return nil, err
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}
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}
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tracing.SpanFromContext(ctx).AddEvent("About to Get from storage")
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return r.Get(ctx, name, &options)
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})
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}
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// GetResourceWithOptions returns a function that handles retrieving a single resource from a rest.Storage object.
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func GetResourceWithOptions(r rest.GetterWithOptions, scope *RequestScope, isSubresource bool) http.HandlerFunc {
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return getResourceHandler(scope,
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func(ctx context.Context, name string, req *http.Request) (runtime.Object, error) {
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opts, subpath, subpathKey := r.NewGetOptions()
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span := tracing.SpanFromContext(ctx)
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span.AddEvent("About to process Get options")
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if err := getRequestOptions(req, scope, opts, subpath, subpathKey, isSubresource); err != nil {
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err = errors.NewBadRequest(err.Error())
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return nil, err
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}
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span.AddEvent("About to Get from storage")
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return r.Get(ctx, name, opts)
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})
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}
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// getRequestOptions parses out options and can include path information. The path information shouldn't include the subresource.
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func getRequestOptions(req *http.Request, scope *RequestScope, into runtime.Object, subpath bool, subpathKey string, isSubresource bool) error {
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if into == nil {
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return nil
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}
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query := req.URL.Query()
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if subpath {
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newQuery := make(url.Values)
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for k, v := range query {
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newQuery[k] = v
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}
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ctx := req.Context()
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requestInfo, _ := request.RequestInfoFrom(ctx)
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startingIndex := 2
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if isSubresource {
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startingIndex = 3
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}
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p := strings.Join(requestInfo.Parts[startingIndex:], "/")
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// ensure non-empty subpaths correctly reflect a leading slash
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if len(p) > 0 && !strings.HasPrefix(p, "/") {
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p = "/" + p
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}
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// ensure subpaths correctly reflect the presence of a trailing slash on the original request
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if strings.HasSuffix(requestInfo.Path, "/") && !strings.HasSuffix(p, "/") {
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p += "/"
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}
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newQuery[subpathKey] = []string{p}
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query = newQuery
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}
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return scope.ParameterCodec.DecodeParameters(query, scope.Kind.GroupVersion(), into)
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}
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func ListResource(r rest.Lister, rw rest.Watcher, scope *RequestScope, forceWatch bool, minRequestTimeout time.Duration) http.HandlerFunc {
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return func(w http.ResponseWriter, req *http.Request) {
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ctx := req.Context()
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// For performance tracking purposes.
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ctx, span := tracing.Start(ctx, "List", traceFields(req)...)
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namespace, err := scope.Namer.Namespace(req)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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// Watches for single objects are routed to this function.
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// Treat a name parameter the same as a field selector entry.
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hasName := true
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_, name, err := scope.Namer.Name(req)
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if err != nil {
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hasName = false
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}
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ctx = request.WithNamespace(ctx, namespace)
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outputMediaType, _, err := negotiation.NegotiateOutputMediaType(req, scope.Serializer, scope)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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opts := metainternalversion.ListOptions{}
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if err := metainternalversionscheme.ParameterCodec.DecodeParameters(req.URL.Query(), scope.MetaGroupVersion, &opts); err != nil {
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err = errors.NewBadRequest(err.Error())
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scope.err(err, w, req)
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return
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}
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metainternalversion.SetListOptionsDefaults(&opts, utilfeature.DefaultFeatureGate.Enabled(features.WatchList))
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if errs := metainternalversionvalidation.ValidateListOptions(&opts, utilfeature.DefaultFeatureGate.Enabled(features.WatchList)); len(errs) > 0 {
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err := errors.NewInvalid(schema.GroupKind{Group: metav1.GroupName, Kind: "ListOptions"}, "", errs)
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scope.err(err, w, req)
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return
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}
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// transform fields
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// TODO: DecodeParametersInto should do this.
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if opts.FieldSelector != nil {
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fn := func(label, value string) (newLabel, newValue string, err error) {
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return scope.Convertor.ConvertFieldLabel(scope.Kind, label, value)
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}
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if opts.FieldSelector, err = opts.FieldSelector.Transform(fn); err != nil {
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// TODO: allow bad request to set field causes based on query parameters
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err = errors.NewBadRequest(err.Error())
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scope.err(err, w, req)
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return
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}
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}
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if hasName {
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// metadata.name is the canonical internal name.
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// SelectionPredicate will notice that this is a request for
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// a single object and optimize the storage query accordingly.
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nameSelector := fields.OneTermEqualSelector("metadata.name", name)
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// Note that fieldSelector setting explicitly the "metadata.name"
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// will result in reaching this branch (as the value of that field
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// is propagated to requestInfo as the name parameter.
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// That said, the allowed field selectors in this branch are:
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// nil, fields.Everything and field selector matching metadata.name
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// for our name.
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if opts.FieldSelector != nil && !opts.FieldSelector.Empty() {
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selectedName, ok := opts.FieldSelector.RequiresExactMatch("metadata.name")
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if !ok || name != selectedName {
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scope.err(errors.NewBadRequest("fieldSelector metadata.name doesn't match requested name"), w, req)
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return
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}
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} else {
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opts.FieldSelector = nameSelector
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}
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}
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if opts.Watch || forceWatch {
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if rw == nil {
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scope.err(errors.NewMethodNotSupported(scope.Resource.GroupResource(), "watch"), w, req)
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return
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}
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// TODO: Currently we explicitly ignore ?timeout= and use only ?timeoutSeconds=.
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timeout := time.Duration(0)
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if opts.TimeoutSeconds != nil {
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timeout = time.Duration(*opts.TimeoutSeconds) * time.Second
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}
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if timeout == 0 && minRequestTimeout > 0 {
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timeout = time.Duration(float64(minRequestTimeout) * (rand.Float64() + 1.0))
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}
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klog.V(3).InfoS("Starting watch", "path", req.URL.Path, "resourceVersion", opts.ResourceVersion, "labels", opts.LabelSelector, "fields", opts.FieldSelector, "timeout", timeout)
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ctx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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watcher, err := rw.Watch(ctx, &opts)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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requestInfo, _ := request.RequestInfoFrom(ctx)
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metrics.RecordLongRunning(req, requestInfo, metrics.APIServerComponent, func() {
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serveWatch(watcher, scope, outputMediaType, req, w, timeout)
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})
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return
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}
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// Log only long List requests (ignore Watch).
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defer span.End(500 * time.Millisecond)
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span.AddEvent("About to List from storage")
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result, err := r.List(ctx, &opts)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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span.AddEvent("Listing from storage done")
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defer span.AddEvent("Writing http response done", attribute.Int("count", meta.LenList(result)))
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transformResponseObject(ctx, scope, req, w, http.StatusOK, outputMediaType, result)
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}
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}
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