mirror of
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116 lines
3.4 KiB
Go
116 lines
3.4 KiB
Go
/*
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Copyright 2019 The Kruise 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 metrics
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import (
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"context"
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"encoding/json"
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"net/http"
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"k8s.io/klog"
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"k8s.io/utils/pointer"
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"sigs.k8s.io/controller-runtime/pkg/client"
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logf "sigs.k8s.io/controller-runtime/pkg/log"
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"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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"github.com/cloud-native-application/rudrx/api/v1alpha1"
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util "github.com/cloud-native-application/rudrx/pkg/utils"
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)
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const (
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// SupportedFormat is the only metrics data format we support
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SupportedFormat = "prometheus"
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// SupportedScheme is the only scheme we support
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SupportedScheme = "http"
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// DefaultMetricsPath is the default metrics path we support
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DefaultMetricsPath = "/metrics"
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)
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// MetricsTraitMutatingHandler handles MetricsTrait
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type MetricsTraitMutatingHandler struct {
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Client client.Client
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// Decoder decodes objects
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Decoder *admission.Decoder
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}
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// log is for logging in this package.
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var mutatelog = logf.Log.WithName("metricstrait-mutate")
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var _ admission.Handler = &MetricsTraitMutatingHandler{}
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// Handle handles admission requests.
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func (h *MetricsTraitMutatingHandler) Handle(ctx context.Context, req admission.Request) admission.Response {
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obj := &v1alpha1.MetricsTrait{}
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err := h.Decoder.Decode(req, obj)
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if err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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Default(obj)
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marshalled, err := json.Marshal(obj)
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if err != nil {
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return admission.Errored(http.StatusInternalServerError, err)
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}
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resp := admission.PatchResponseFromRaw(req.AdmissionRequest.Object.Raw, marshalled)
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if len(resp.Patches) > 0 {
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klog.V(5).Infof("Admit MetricsTrait %s/%s patches: %v", obj.Namespace, obj.Name, util.DumpJSON(resp.Patches))
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}
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return resp
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}
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// Default sets all the default value for the metricsTrait
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func Default(obj *v1alpha1.MetricsTrait) {
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mutatelog.Info("default", "name", obj.Name)
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if len(obj.Spec.ScrapeService.Format) == 0 {
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mutatelog.Info("default format as prometheus")
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obj.Spec.ScrapeService.Format = SupportedFormat
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}
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if len(obj.Spec.ScrapeService.Path) == 0 {
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mutatelog.Info("default path as /metrics")
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obj.Spec.ScrapeService.Path = DefaultMetricsPath
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}
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if len(obj.Spec.ScrapeService.Scheme) == 0 {
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mutatelog.Info("default scheme as http")
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obj.Spec.ScrapeService.Scheme = SupportedScheme
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}
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if obj.Spec.ScrapeService.Enabled == nil {
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mutatelog.Info("default enabled as true")
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obj.Spec.ScrapeService.Enabled = pointer.BoolPtr(true)
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}
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}
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var _ inject.Client = &MetricsTraitMutatingHandler{}
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// InjectClient injects the client into the MetricsTraitMutatingHandler
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func (h *MetricsTraitMutatingHandler) InjectClient(c client.Client) error {
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h.Client = c
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return nil
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}
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var _ admission.DecoderInjector = &MetricsTraitMutatingHandler{}
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// InjectDecoder injects the decoder into the MetricsTraitMutatingHandler
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func (h *MetricsTraitMutatingHandler) InjectDecoder(d *admission.Decoder) error {
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h.Decoder = d
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return nil
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}
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