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128 lines
3.5 KiB
128 lines
3.5 KiB
// Copyright 2019 The prometheus-operator 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 e2e
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"k8s.io/client-go/kubernetes"
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"github.com/Jeffail/gabs"
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promv1 "github.com/prometheus/client_golang/api/prometheus/v1"
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)
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type prometheusClient struct {
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kubeClient kubernetes.Interface
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}
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func newPrometheusClient(kubeClient kubernetes.Interface) *prometheusClient {
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return &prometheusClient{kubeClient}
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}
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// Response hold API response in a form similar to apiResponse struct from prometheus/client_golang
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// https://github.com/prometheus/client_golang/blob/master/api/prometheus/v1/api.go
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type Response struct {
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Status string `json:"status"`
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Data json.RawMessage `json:"data"`
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}
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// apiRequest makes a request against specified Prometheus API endpoint
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func (c *prometheusClient) apiRequest(endpoint string, selector string, query string) (Response, error) {
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req := c.kubeClient.CoreV1().RESTClient().Get().
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Namespace("monitoring").
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Resource("pods").
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SubResource("proxy").
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Name("prometheus-k8s-0:9090").
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Suffix(endpoint).Param(selector, query)
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var data Response
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b, err := req.DoRaw(context.Background())
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if err != nil {
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return data, err
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}
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r := bytes.NewReader(b)
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decoder := json.NewDecoder(r)
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err = decoder.Decode(&data)
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if err != nil {
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return data, err
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}
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if data.Status != "success" {
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return data, fmt.Errorf("status of returned response was not successful; status: %s", data.Status)
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}
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return data, err
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}
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// Query makes a request against the Prometheus /api/v1/query endpoint.
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func (c *prometheusClient) query(query string) (int, error) {
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req := c.kubeClient.CoreV1().RESTClient().Get().
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Namespace("monitoring").
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Resource("pods").
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SubResource("proxy").
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Name("prometheus-k8s-0:9090").
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Suffix("/api/v1/query").Param("query", query)
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b, err := req.DoRaw(context.Background())
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if err != nil {
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return 0, err
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}
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res, err := gabs.ParseJSON(b)
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if err != nil {
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return 0, err
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}
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n, err := res.ArrayCountP("data.result")
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return n, err
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}
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// metadata makes a request against the Prometheus /api/v1/targets/metadata endpoint.
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// It returns all the metrics and its metadata.
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func (c *prometheusClient) metadata(query string) ([]promv1.MetricMetadata, error) {
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var metadata []promv1.MetricMetadata
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rsp, err := c.apiRequest("/api/v1/targets/metadata", "match_target", query)
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r := bytes.NewReader(rsp.Data)
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decoder := json.NewDecoder(r)
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err = decoder.Decode(&metadata)
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if err != nil {
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return metadata, err
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}
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return metadata, err
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}
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// targets makes a request against the Prometheus /api/v1/targets endpoint.
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// It returns all targets registered in prometheus.
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func (c *prometheusClient) targets() (promv1.TargetsResult, error) {
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var targets promv1.TargetsResult
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rsp, err := c.apiRequest("/api/v1/targets", "state", "any")
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if err != nil {
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return targets, err
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}
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r := bytes.NewReader(rsp.Data)
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decoder := json.NewDecoder(r)
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err = decoder.Decode(&targets)
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if err != nil {
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return targets, err
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}
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return targets, err
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}
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