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collector.go
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collector.go
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package main
import (
"encoding/json"
"net/http"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
)
// BrowserlessTotalCollector collects metrics about a browserless instance.
type BrowserlessTotalCollector struct {
logger log.Logger
httpClient http.Client
errors *prometheus.CounterVec
timeout time.Duration
browserlessEndpoint string
Successful *prometheus.Desc
Error *prometheus.Desc
Queued *prometheus.Desc
Rejected *prometheus.Desc
Unhealthy *prometheus.Desc
Timedout *prometheus.Desc
TotalTime *prometheus.Desc
MeanTime *prometheus.Desc
MaxTime *prometheus.Desc
MinTime *prometheus.Desc
MaxConcurrent *prometheus.Desc
}
// NewBrowserlessTotalCollector returns a new BrowserlessCollector.to get the total metrics of an instance
func NewBrowserlessTotalCollector(logger log.Logger, httpClient http.Client, errors *prometheus.CounterVec, timeout time.Duration, browserlessEndpoint string) *BrowserlessTotalCollector {
errors.WithLabelValues("metrics-total").Add(0)
return &BrowserlessTotalCollector{
logger: logger,
errors: errors,
timeout: timeout,
browserlessEndpoint: browserlessEndpoint,
httpClient: httpClient,
Successful: prometheus.NewDesc(
"browserless_successful",
"Number of successful requests",
nil, nil,
),
Error: prometheus.NewDesc(
"browserless_error",
"Number of requests resulting in an error",
nil, nil,
),
Queued: prometheus.NewDesc(
"browserless_queued",
"Number of requests that got queued",
nil, nil,
),
Rejected: prometheus.NewDesc(
"browserless_rejected",
"Number of requests that got rejected",
nil, nil,
),
Unhealthy: prometheus.NewDesc(
"browserless_unhealthy",
"Number of unhealthy requests",
nil, nil,
),
Timedout: prometheus.NewDesc(
"browserless_timedout",
"Number of timedout requests",
nil, nil,
),
TotalTime: prometheus.NewDesc(
"browserless_time_total",
"TotalTime as defined by browserless",
nil, nil,
),
MeanTime: prometheus.NewDesc(
"browserless_time_mean",
"MeanTime as defined by browserless",
nil, nil,
),
MaxTime: prometheus.NewDesc(
"browserless_time_max",
"MaxTime as defined by browserless",
nil, nil,
),
MinTime: prometheus.NewDesc(
"browserless_time_min",
"MinTime as defined by browserless",
nil, nil,
),
MaxConcurrent: prometheus.NewDesc(
"browserless_concurrent_max",
"Maximum number of concurrent sessions observed",
nil, nil,
),
}
}
// Describe sends the super-set of all possible descriptors of metrics collected by this Collector.
func (c *BrowserlessTotalCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- c.Successful
ch <- c.Error
ch <- c.Queued
ch <- c.Rejected
ch <- c.Unhealthy
ch <- c.Timedout
ch <- c.TotalTime
ch <- c.MeanTime
ch <- c.MaxTime
ch <- c.MinTime
ch <- c.MaxConcurrent
}
// Collect is called by the Prometheus registry when collecting metrics.
func (c *BrowserlessTotalCollector) Collect(ch chan<- prometheus.Metric) {
resp, err := c.httpClient.Get(c.browserlessEndpoint)
if err != nil {
c.errors.WithLabelValues("metrics-total").Add(1)
level.Warn(c.logger).Log("msg", "couldn't fetch metrics from total endpoint", "err", err)
return
}
var m metricsResponse
if err := json.NewDecoder(resp.Body).Decode(&m); err != nil {
c.errors.WithLabelValues("metrics-total").Add(1)
level.Warn(c.logger).Log("msg", "couldn't decode metrics response", "err", err)
return
}
ch <- prometheus.MustNewConstMetric(
c.Successful,
prometheus.CounterValue,
float64(m.Successful),
)
ch <- prometheus.MustNewConstMetric(
c.Error,
prometheus.CounterValue,
float64(m.Error),
)
ch <- prometheus.MustNewConstMetric(
c.Queued,
prometheus.CounterValue,
float64(m.Queued),
)
ch <- prometheus.MustNewConstMetric(
c.Rejected,
prometheus.CounterValue,
float64(m.Rejected),
)
ch <- prometheus.MustNewConstMetric(
c.Unhealthy,
prometheus.CounterValue,
float64(m.Unhealthy),
)
ch <- prometheus.MustNewConstMetric(
c.Timedout,
prometheus.CounterValue,
float64(m.Timedout),
)
ch <- prometheus.MustNewConstMetric(
c.TotalTime,
prometheus.GaugeValue,
m.TotalTime,
)
ch <- prometheus.MustNewConstMetric(
c.MeanTime,
prometheus.GaugeValue,
m.MeanTime,
)
ch <- prometheus.MustNewConstMetric(
c.MaxTime,
prometheus.GaugeValue,
m.MaxTime,
)
ch <- prometheus.MustNewConstMetric(
c.MinTime,
prometheus.GaugeValue,
m.MinTime,
)
ch <- prometheus.MustNewConstMetric(
c.MaxConcurrent,
prometheus.GaugeValue,
float64(m.MaxConcurrent),
)
}
// metricsResponse is the response returned by Browserless for an instance
type metricsResponse struct {
Successful int `json:"successful"`
Error int `json:"error"`
Queued int `json:"queued"`
Rejected int `json:"rejected"`
Unhealthy int `json:"unhealthy"`
Timedout int `json:"timedout"`
TotalTime float64 `json:"totalTime"`
MeanTime float64 `json:"meanTime"`
MaxTime float64 `json:"maxTime"`
MinTime float64 `json:"minTime"`
MaxConcurrent int `json:"maxConcurrent"`
}