github.com/kubewharf/katalyst-core@v0.5.3/pkg/controller/resource-recommend/datasource/prometheus/prometheus_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 prometheus
    18  
    19  import (
    20  	"context"
    21  	"crypto/tls"
    22  	"net"
    23  	"net/http"
    24  	"net/url"
    25  	"time"
    26  
    27  	prometheusapi "github.com/prometheus/client_golang/api"
    28  
    29  	"github.com/kubewharf/katalyst-core/pkg/controller/resource-recommend/datasource/prometheus/auth"
    30  )
    31  
    32  // PromConfig represents the config of prometheus
    33  type PromConfig struct {
    34  	Address            string
    35  	Timeout            time.Duration
    36  	KeepAlive          time.Duration
    37  	InsecureSkipVerify bool
    38  	Auth               auth.ClientAuth
    39  
    40  	QueryConcurrency            int
    41  	BRateLimit                  bool
    42  	MaxPointsLimitPerTimeSeries int
    43  	TLSHandshakeTimeoutInSecond time.Duration
    44  
    45  	BaseFilter string
    46  }
    47  
    48  type prometheusAuthClient struct {
    49  	client prometheusapi.Client
    50  }
    51  
    52  // URL implements prometheus client interface
    53  func (p *prometheusAuthClient) URL(ep string, args map[string]string) *url.URL {
    54  	return p.client.URL(ep, args)
    55  }
    56  
    57  // Do implements prometheus client interface, wrapped with an auth info
    58  func (p *prometheusAuthClient) Do(ctx context.Context, request *http.Request) (*http.Response, []byte, error) {
    59  	return p.client.Do(ctx, request)
    60  }
    61  
    62  // NewPrometheusClient returns a prometheus.Client
    63  func NewPrometheusClient(config *PromConfig) (prometheusapi.Client, error) {
    64  	tlsConfig := &tls.Config{InsecureSkipVerify: config.InsecureSkipVerify}
    65  
    66  	var rt http.RoundTripper = &http.Transport{
    67  		Proxy: http.ProxyFromEnvironment,
    68  		DialContext: (&net.Dialer{
    69  			Timeout:   config.Timeout,
    70  			KeepAlive: config.KeepAlive,
    71  		}).DialContext,
    72  		TLSHandshakeTimeout: config.TLSHandshakeTimeoutInSecond,
    73  		TLSClientConfig:     tlsConfig,
    74  	}
    75  
    76  	t, err := auth.GetRoundTripper(&config.Auth, rt, auth.GetRegisteredRoundTripperFactoryInitializers())
    77  	if err != nil {
    78  		return nil, err
    79  	}
    80  
    81  	pc := prometheusapi.Config{
    82  		Address:      config.Address,
    83  		RoundTripper: t,
    84  	}
    85  	return newPrometheusAuthClient(pc)
    86  }
    87  
    88  func newPrometheusAuthClient(config prometheusapi.Config) (prometheusapi.Client, error) {
    89  	c, err := prometheusapi.NewClient(config)
    90  	if err != nil {
    91  		return nil, err
    92  	}
    93  
    94  	client := &prometheusAuthClient{
    95  		client: c,
    96  	}
    97  
    98  	return client, nil
    99  }