github.com/kubewharf/katalyst-core@v0.5.3/pkg/metaserver/agent/metric/provisioner/rodan/client/client.go (about)

     1  /*
     2  Copyright 2022 The Katalyst Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package client
    18  
    19  import (
    20  	"fmt"
    21  	"io"
    22  	"net/http"
    23  
    24  	"github.com/kubewharf/katalyst-core/pkg/metaserver/agent/metric/provisioner/rodan/types"
    25  	"github.com/kubewharf/katalyst-core/pkg/metaserver/agent/pod"
    26  )
    27  
    28  type RodanClient struct {
    29  	urls map[string]string
    30  
    31  	fetcher pod.PodFetcher
    32  
    33  	metricFunc MetricFunc
    34  }
    35  
    36  func NewRodanClient(fetcher pod.PodFetcher, metricFunc MetricFunc, port int) *RodanClient {
    37  	urls := make(map[string]string)
    38  	for path := range types.MetricsMap {
    39  		urls[path] = fmt.Sprintf("http://localhost:%d%s", port, path)
    40  	}
    41  
    42  	if metricFunc == nil {
    43  		metricFunc = getMetrics
    44  	}
    45  
    46  	return &RodanClient{
    47  		fetcher:    fetcher,
    48  		urls:       urls,
    49  		metricFunc: metricFunc,
    50  	}
    51  }
    52  
    53  type MetricFunc func(url string, params map[string]string) ([]byte, error)
    54  
    55  func getMetrics(url string, params map[string]string) ([]byte, error) {
    56  	if len(params) != 0 {
    57  		firstParam := true
    58  
    59  		for k, v := range params {
    60  			if firstParam {
    61  				url += "?"
    62  				firstParam = false
    63  			} else {
    64  				url += "&"
    65  			}
    66  			url = fmt.Sprintf("%s%s=%s", url, k, v)
    67  		}
    68  	}
    69  
    70  	rsp, err := http.Get(url)
    71  	if err != nil {
    72  		return nil, fmt.Errorf("failed to get metrics, url: %v, err: %v", url, err)
    73  	}
    74  	defer func() { _ = rsp.Body.Close() }()
    75  
    76  	if rsp.StatusCode != 200 {
    77  		return nil, fmt.Errorf("invalid http response status code %d, status: %s, url: %s", rsp.StatusCode, rsp.Status, url)
    78  	}
    79  
    80  	return io.ReadAll(rsp.Body)
    81  }