70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
// Copyright © 2017 The virtual-kubelet authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package api
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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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"github.com/pkg/errors"
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stats "k8s.io/kubelet/pkg/apis/stats/v1alpha1"
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)
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// PodStatsSummaryHandlerFunc defines the handler for getting pod stats summaries
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type PodStatsSummaryHandlerFunc func(context.Context) (*stats.Summary, error)
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// HandlePodStatsSummary makes an HTTP handler for implementing the kubelet summary stats endpoint
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func HandlePodStatsSummary(h PodStatsSummaryHandlerFunc) http.HandlerFunc {
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if h == nil {
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return NotImplemented
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}
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return handleError(func(w http.ResponseWriter, req *http.Request) error {
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stats, err := h(req.Context())
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if err != nil {
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if isCancelled(err) {
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return err
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}
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return errors.Wrap(err, "error getting status from provider")
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}
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b, err := json.Marshal(stats)
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if err != nil {
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return errors.Wrap(err, "error marshalling stats")
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}
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if _, err := w.Write(b); err != nil {
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return errors.Wrap(err, "could not write to client")
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}
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return nil
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})
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}
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func isCancelled(err error) bool {
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if err == context.Canceled {
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return true
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}
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if e, ok := err.(causal); ok {
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return isCancelled(e.Cause())
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}
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return false
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}
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type causal interface {
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Cause() error
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error
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}
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