github.com/galamsiva2020/kubernetes-heapster-monitoring@v0.0.0-20210823134957-3c1baa7c1e70/common/librato/librato.go (about)

     1  // Copyright 2017 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package librato
    16  
    17  import (
    18  	"bytes"
    19  	"encoding/json"
    20  	"fmt"
    21  	"net"
    22  	"net/http"
    23  	"net/url"
    24  	"strings"
    25  	"time"
    26  )
    27  
    28  type Measurement struct {
    29  	Name  string            `json:"name,omitempty"`
    30  	Value float64           `json:"value,omitempty"`
    31  	Tags  map[string]string `json:"tags,omitempty"`
    32  	Time  int64             `json:"time,omitempty"`
    33  }
    34  
    35  type request struct {
    36  	Tags         map[string]string `json:"tags,omitempty"`
    37  	Measurements []Measurement     `json:"measurements,omitempty"`
    38  }
    39  
    40  type Client interface {
    41  	Write([]Measurement) error
    42  }
    43  
    44  type LibratoClient struct {
    45  	httpClient *http.Client
    46  	config     LibratoConfig
    47  }
    48  
    49  func (c *LibratoClient) Write(measurements []Measurement) error {
    50  	b, err := json.Marshal(&request{
    51  		Measurements: measurements,
    52  		Tags:         c.config.Tags,
    53  	})
    54  	if nil != err {
    55  		return err
    56  	}
    57  	req, err := http.NewRequest(
    58  		"POST",
    59  		c.config.API+"/v1/measurements",
    60  		bytes.NewBuffer(b),
    61  	)
    62  	if nil != err {
    63  		return err
    64  	}
    65  	req.Header.Add("Content-Type", "application/json")
    66  	req.Header.Set("User-Agent", "heapster")
    67  	req.SetBasicAuth(c.config.Username, c.config.Token)
    68  	_, err = c.httpClient.Do(req)
    69  	return err
    70  }
    71  
    72  type LibratoConfig struct {
    73  	Username string
    74  	Token    string
    75  	API      string
    76  	Prefix   string
    77  	Tags     map[string]string
    78  }
    79  
    80  func NewClient(c LibratoConfig) *LibratoClient {
    81  	var netTransport = &http.Transport{
    82  		Dial: (&net.Dialer{
    83  			Timeout: 5 * time.Second,
    84  		}).Dial,
    85  		TLSHandshakeTimeout: 5 * time.Second,
    86  	}
    87  	var httpClient = &http.Client{
    88  		Timeout:   time.Second * 10,
    89  		Transport: netTransport,
    90  	}
    91  
    92  	client := &LibratoClient{httpClient: httpClient, config: c}
    93  	return client
    94  }
    95  
    96  func BuildConfig(uri *url.URL) (*LibratoConfig, error) {
    97  	config := LibratoConfig{API: "https://metrics-api.librato.com", Prefix: ""}
    98  
    99  	opts := uri.Query()
   100  	if len(opts["username"]) >= 1 {
   101  		config.Username = opts["username"][0]
   102  	} else {
   103  		return nil, fmt.Errorf("no `username` flag specified")
   104  	}
   105  	// TODO: use more secure way to pass the password.
   106  	if len(opts["token"]) >= 1 {
   107  		config.Token = opts["token"][0]
   108  	} else {
   109  		return nil, fmt.Errorf("no `token` flag specified")
   110  	}
   111  	if len(opts["api"]) >= 1 {
   112  		config.API = opts["api"][0]
   113  	}
   114  	if len(opts["prefix"]) >= 1 {
   115  		config.Prefix = opts["prefix"][0]
   116  
   117  		if !strings.HasSuffix(config.Prefix, ".") {
   118  			config.Prefix = config.Prefix + "."
   119  		}
   120  	}
   121  	if len(opts["tags"]) >= 1 {
   122  		config.Tags = make(map[string]string)
   123  
   124  		tagNames := strings.Split(opts["tags"][0], ",")
   125  
   126  		for _, tagName := range tagNames {
   127  			if val, ok := opts["tag_"+tagName]; ok {
   128  				config.Tags[tagName] = val[0]
   129  			}
   130  		}
   131  	}
   132  
   133  	return &config, nil
   134  }