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| 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 | +} |
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