forked from virtual-kubelet/virtual-kubelet
/
stats.go
69 lines (59 loc) · 1.78 KB
/
stats.go
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// Copyright © 2017 The virtual-kubelet authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"context"
"encoding/json"
"net/http"
"github.com/pkg/errors"
stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
)
// PodStatsSummaryHandlerFunc defines the handler for getting pod stats summaries
type PodStatsSummaryHandlerFunc func(context.Context) (*stats.Summary, error)
// HandlePodStatsSummary makes an HTTP handler for implementing the kubelet summary stats endpoint
func HandlePodStatsSummary(h PodStatsSummaryHandlerFunc) http.HandlerFunc {
if h == nil {
return NotImplemented
}
return handleError(func(w http.ResponseWriter, req *http.Request) error {
stats, err := h(req.Context())
if err != nil {
if isCancelled(err) {
return err
}
return errors.Wrap(err, "error getting status from provider")
}
b, err := json.Marshal(stats)
if err != nil {
return errors.Wrap(err, "error marshalling stats")
}
if _, err := w.Write(b); err != nil {
return errors.Wrap(err, "could not write to client")
}
return nil
})
}
func isCancelled(err error) bool {
if err == context.Canceled {
return true
}
if e, ok := err.(causal); ok {
return isCancelled(e.Cause())
}
return false
}
type causal interface {
Cause() error
error
}