mirror of https://github.com/knative/pkg.git
142 lines
4.1 KiB
Go
142 lines
4.1 KiB
Go
/*
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Copyright 2020 The Knative 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 webhook
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"strings"
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"time"
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"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
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"go.opentelemetry.io/otel/codes"
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"go.opentelemetry.io/otel/metric"
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"go.opentelemetry.io/otel/trace"
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"go.uber.org/zap"
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apixv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"knative.dev/pkg/apis"
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"knative.dev/pkg/logging"
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)
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// ConversionController provides the interface for different conversion controllers
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type ConversionController interface {
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// Path returns the path that this particular conversion controller serves on.
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Path() string
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// Convert is the callback which is invoked when an HTTPS request comes in on Path().
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Convert(context.Context, *apixv1.ConversionRequest) *apixv1.ConversionResponse
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}
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func conversionHandler(wh *Webhook, c ConversionController) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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logger := wh.Logger
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logger.Infof("Webhook ServeHTTP request=%#v", r)
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span := trace.SpanFromContext(r.Context())
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// otelhttp middleware creates the labeler
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labeler, _ := otelhttp.LabelerFromContext(r.Context())
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defer func() {
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// otelhttp doesn't add labeler attributes to spans
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// so we have to do it manually
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span.SetAttributes(labeler.Get()...)
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}()
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var review apixv1.ConversionReview
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if err := json.NewDecoder(r.Body).Decode(&review); err != nil {
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msg := fmt.Sprint("could not decode body:", err)
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span.SetStatus(codes.Error, msg)
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http.Error(w, msg, http.StatusBadRequest)
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return
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}
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gv, err := parseAPIVersion(review.Request.DesiredAPIVersion)
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if err != nil {
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msg := fmt.Sprint("could parse desired api version:", err)
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span.SetStatus(codes.Error, msg)
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http.Error(w, msg, http.StatusBadRequest)
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return
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}
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labeler.Add(
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WebhookTypeAttr.With(WebhookTypeConversion),
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GroupAttr.With(gv.Group),
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VersionAttr.With(gv.Version),
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)
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logger = logger.With(
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zap.String("uid", string(review.Request.UID)),
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zap.String("desiredAPIVersion", review.Request.DesiredAPIVersion),
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)
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ctx := logging.WithLogger(r.Context(), logger)
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ctx = apis.WithHTTPRequest(ctx, r)
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ttStart := time.Now()
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response := apixv1.ConversionReview{
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// Use the same type meta as the request - this is required by the K8s API
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// note: v1beta1 & v1 ConversionReview shapes are identical so even though
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// we're using v1 types we still support v1beta1 conversion requests
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TypeMeta: review.TypeMeta,
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Response: c.Convert(ctx, review.Request),
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}
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labeler.Add(
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StatusAttr.With(strings.ToLower(response.Response.Result.Status)),
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)
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if response.Response.Result.Status == metav1.StatusFailure {
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span.SetStatus(codes.Error, response.Response.Result.Message)
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}
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wh.metrics.recordHandlerDuration(ctx, time.Since(ttStart),
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metric.WithAttributes(labeler.Get()...),
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)
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if err := json.NewEncoder(w).Encode(response); err != nil {
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http.Error(w, fmt.Sprint("could not encode response:", err), http.StatusInternalServerError)
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return
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}
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span.SetStatus(codes.Ok, "")
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}
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}
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func parseAPIVersion(apiVersion string) (schema.GroupVersion, error) {
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gv, err := schema.ParseGroupVersion(apiVersion)
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if err != nil {
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err = fmt.Errorf("desired API version %q is not valid", apiVersion)
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return schema.GroupVersion{}, err
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}
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if !isValidGV(gv) {
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err = fmt.Errorf("desired API version %q is not valid", apiVersion)
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return schema.GroupVersion{}, err
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}
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return gv, nil
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}
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func isValidGV(gk schema.GroupVersion) bool {
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return gk.Group != "" && gk.Version != ""
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}
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