68 lines
2.1 KiB
Go
68 lines
2.1 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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"bytes"
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"context"
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"net/http"
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"github.com/pkg/errors"
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dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/common/expfmt"
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)
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const (
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PrometheusTextFormatContentType = "text/plain; version=0.0.4"
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)
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// PodMetricsResourceHandlerFunc defines the handler for getting pod metrics
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type PodMetricsResourceHandlerFunc func(context.Context) ([]*dto.MetricFamily, error)
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// HandlePodMetricsResource makes an HTTP handler for implementing the kubelet /metrics/resource endpoint
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func HandlePodMetricsResource(h PodMetricsResourceHandlerFunc) 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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metrics, 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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// Convert metrics to Prometheus text format.
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var buffer bytes.Buffer
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enc := expfmt.NewEncoder(&buffer, expfmt.FmtText)
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for _, mf := range metrics {
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if err := enc.Encode(mf); err != nil {
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return errors.Wrap(err, "could not convert metrics to prometheus text format")
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}
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}
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// Set the response content type to "text/plain; version=0.0.4".
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w.Header().Set("Content-Type", PrometheusTextFormatContentType)
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// Write the metrics in Prometheus text format to the response writer.
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if _, err := w.Write(buffer.Bytes()); 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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