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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| package librato | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "net/http" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/nyaruka/courier/utils" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| // Default is our default librato collector | ||
| var Default *Sender | ||
|
|
||
| // NewSender creates a new librato Sender with the passed in parameters | ||
| func NewSender(waitGroup *sync.WaitGroup, username string, token string, source string, timeout time.Duration) *Sender { | ||
| return &Sender{ | ||
| waitGroup: waitGroup, | ||
| stop: make(chan bool), | ||
|
|
||
| buffer: make(chan gauge, 1000), | ||
| username: username, | ||
| token: token, | ||
| source: source, | ||
| timeout: timeout, | ||
| } | ||
| } | ||
|
|
||
| // AddGauge can be used to add a new gauge to be sent to librato | ||
| func (c *Sender) AddGauge(name string, value float64) { | ||
| // if no librato configured, return | ||
| if c == nil { | ||
| return | ||
| } | ||
|
|
||
| // our buffer is full, log an error but continue | ||
| if len(c.buffer) >= cap(c.buffer) { | ||
| logrus.Error("unable to add new gauges, buffer full, you may want to increase your buffer size or decrease your timeout") | ||
| return | ||
| } | ||
|
|
||
| c.buffer <- gauge{Name: strings.ToLower(name), Value: value, MeasureTime: time.Now().Unix()} | ||
| } | ||
|
|
||
| // Start starts our librato sender, callers can use Stop to stop it | ||
| func (c *Sender) Start() { | ||
| if c == nil { | ||
| return | ||
| } | ||
|
|
||
| go func() { | ||
| c.waitGroup.Add(1) | ||
| defer c.waitGroup.Done() | ||
| for { | ||
| select { | ||
| case <-c.stop: | ||
| c.flush(1000) | ||
| logrus.WithField("comp", "librato").Info("stopped") | ||
| return | ||
|
|
||
| case <-time.After(c.timeout * time.Second): | ||
| c.flush(300) | ||
| } | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func (c *Sender) flush(count int) { | ||
| if len(c.buffer) <= 0 { | ||
| return | ||
| } | ||
|
|
||
| // build our payload | ||
| reqPayload := &payload{ | ||
| MeasureTime: time.Now().Unix(), | ||
| Source: c.source, | ||
| Gauges: make([]gauge, 0, len(c.buffer)), | ||
| } | ||
|
|
||
| // read up to our count of gauges | ||
| for i := 0; i < count; i++ { | ||
| select { | ||
| case g := <-c.buffer: | ||
| reqPayload.Gauges = append(reqPayload.Gauges, g) | ||
| default: | ||
| break | ||
| } | ||
| } | ||
|
|
||
| // send it off | ||
| encoded, err := json.Marshal(reqPayload) | ||
| if err != nil { | ||
| logrus.WithField("comp", "librato").WithError(err).Error("error encoding librato metrics") | ||
| return | ||
| } | ||
|
|
||
| req, err := http.NewRequest("POST", "https://metrics-api.librato.com/v1/metrics", bytes.NewReader(encoded)) | ||
| if err != nil { | ||
| logrus.WithField("comp", "librato").WithError(err).Error("error sending librato metrics") | ||
| return | ||
| } | ||
| req.SetBasicAuth(c.username, c.token) | ||
| req.Header.Set("Content-Type", "application/json") | ||
| _, err = utils.MakeHTTPRequest(req) | ||
|
|
||
| if err != nil { | ||
| logrus.WithField("comp", "librato").WithError(err).Error("error sending librato metrics") | ||
| return | ||
| } | ||
|
|
||
| logrus.WithField("comp", "librato").WithField("body", string(encoded)).WithField("count", len(reqPayload.Gauges)).Debug("flushed to librato") | ||
| } | ||
|
|
||
| // Stop stops our sender, callers can use the WaitGroup used during initialization to block for stop | ||
| func (c *Sender) Stop() { | ||
| if c == nil { | ||
| return | ||
| } | ||
| close(c.stop) | ||
| } | ||
|
|
||
| type gauge struct { | ||
| Name string `json:"name"` | ||
| Value float64 `json:"value"` | ||
| MeasureTime int64 `json:"measure_time"` | ||
| } | ||
|
|
||
| type payload struct { | ||
| MeasureTime int64 `json:"measure_time"` | ||
| Source string `json:"source"` | ||
| Gauges []gauge `json:"gauges"` | ||
| } | ||
|
|
||
| // Sender is responsible for collecting gauges and sending them in batches to our librato server | ||
| type Sender struct { | ||
| waitGroup *sync.WaitGroup | ||
| stop chan bool | ||
|
|
||
| buffer chan gauge | ||
|
|
||
| username string | ||
| token string | ||
| source string | ||
| timeout time.Duration | ||
| } |
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