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bosh_collector.go
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bosh_collector.go
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package collectors
import (
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/cloudfoundry-community/bosh_exporter/deployments"
"github.com/cloudfoundry-community/bosh_exporter/filters"
)
type BoshCollector struct {
enabledCollectors []Collector
deploymentsFetcher *deployments.Fetcher
totalBoshScrapesMetric prometheus.Counter
totalBoshScrapeErrorsMetric prometheus.Counter
lastBoshScrapeErrorMetric prometheus.Gauge
lastBoshScrapeTimestampMetric prometheus.Gauge
lastBoshScrapeDurationSecondsMetric prometheus.Gauge
}
func NewBoshCollector(
namespace string,
environment string,
boshName string,
boshUUID string,
serviceDiscoveryFilename string,
deploymentsFetcher *deployments.Fetcher,
collectorsFilter *filters.CollectorsFilter,
azsFilter *filters.AZsFilter,
processesFilter *filters.RegexpFilter,
) *BoshCollector {
enabledCollectors := []Collector{}
if collectorsFilter.Enabled(filters.DeploymentsCollector) {
deploymentsCollector := NewDeploymentsCollector(namespace, environment, boshName, boshUUID)
enabledCollectors = append(enabledCollectors, deploymentsCollector)
}
if collectorsFilter.Enabled(filters.JobsCollector) {
jobsCollector := NewJobsCollector(namespace, environment, boshName, boshUUID, azsFilter)
enabledCollectors = append(enabledCollectors, jobsCollector)
}
if collectorsFilter.Enabled(filters.ServiceDiscoveryCollector) {
serviceDiscoveryCollector := NewServiceDiscoveryCollector(
namespace,
environment,
boshName,
boshUUID,
serviceDiscoveryFilename,
azsFilter,
processesFilter,
)
enabledCollectors = append(enabledCollectors, serviceDiscoveryCollector)
}
totalBoshScrapesMetric := prometheus.NewCounter(
prometheus.CounterOpts{
Namespace: namespace,
Subsystem: "",
Name: "scrapes_total",
Help: "Total number of times BOSH was scraped for metrics.",
ConstLabels: prometheus.Labels{
"environment": environment,
"bosh_name": boshName,
"bosh_uuid": boshUUID,
},
},
)
totalBoshScrapeErrorsMetric := prometheus.NewCounter(
prometheus.CounterOpts{
Namespace: namespace,
Subsystem: "",
Name: "scrape_errors_total",
Help: "Total number of times an error occured scraping BOSH.",
ConstLabels: prometheus.Labels{
"environment": environment,
"bosh_name": boshName,
"bosh_uuid": boshUUID,
},
},
)
lastBoshScrapeErrorMetric := prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "",
Name: "last_scrape_error",
Help: "Whether the last scrape of metrics from BOSH resulted in an error (1 for error, 0 for success).",
ConstLabels: prometheus.Labels{
"environment": environment,
"bosh_name": boshName,
"bosh_uuid": boshUUID,
},
},
)
lastBoshScrapeTimestampMetric := prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "",
Name: "last_scrape_timestamp",
Help: "Number of seconds since 1970 since last scrape from BOSH.",
ConstLabels: prometheus.Labels{
"environment": environment,
"bosh_name": boshName,
"bosh_uuid": boshUUID,
},
},
)
lastBoshScrapeDurationSecondsMetric := prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: "",
Name: "last_scrape_duration_seconds",
Help: "Duration of the last scrape from BOSH.",
ConstLabels: prometheus.Labels{
"environment": environment,
"bosh_name": boshName,
"bosh_uuid": boshUUID,
},
},
)
return &BoshCollector{
enabledCollectors: enabledCollectors,
deploymentsFetcher: deploymentsFetcher,
totalBoshScrapesMetric: totalBoshScrapesMetric,
totalBoshScrapeErrorsMetric: totalBoshScrapeErrorsMetric,
lastBoshScrapeErrorMetric: lastBoshScrapeErrorMetric,
lastBoshScrapeTimestampMetric: lastBoshScrapeTimestampMetric,
lastBoshScrapeDurationSecondsMetric: lastBoshScrapeDurationSecondsMetric,
}
}
func (c *BoshCollector) Describe(ch chan<- *prometheus.Desc) {
var wg = &sync.WaitGroup{}
for _, collector := range c.enabledCollectors {
wg.Add(1)
go func(collector Collector, ch chan<- *prometheus.Desc) {
defer wg.Done()
collector.Describe(ch)
}(collector, ch)
}
wg.Wait()
c.totalBoshScrapesMetric.Describe(ch)
c.totalBoshScrapeErrorsMetric.Describe(ch)
c.lastBoshScrapeErrorMetric.Describe(ch)
c.lastBoshScrapeTimestampMetric.Describe(ch)
c.lastBoshScrapeDurationSecondsMetric.Describe(ch)
}
func (c *BoshCollector) Collect(ch chan<- prometheus.Metric) {
var begun = time.Now()
scrapeError := 0
c.totalBoshScrapesMetric.Inc()
deployments, err := c.deploymentsFetcher.Deployments()
if err != nil {
log.Error(err)
scrapeError = 1
c.totalBoshScrapeErrorsMetric.Inc()
} else {
if err := c.executeCollectors(deployments, ch); err != nil {
log.Error(err)
scrapeError = 1
c.totalBoshScrapeErrorsMetric.Inc()
}
}
c.totalBoshScrapesMetric.Collect(ch)
c.totalBoshScrapeErrorsMetric.Collect(ch)
c.lastBoshScrapeErrorMetric.Set(float64(scrapeError))
c.lastBoshScrapeErrorMetric.Collect(ch)
c.lastBoshScrapeTimestampMetric.Set(float64(time.Now().Unix()))
c.lastBoshScrapeTimestampMetric.Collect(ch)
c.lastBoshScrapeDurationSecondsMetric.Set(time.Since(begun).Seconds())
c.lastBoshScrapeDurationSecondsMetric.Collect(ch)
}
func (c *BoshCollector) executeCollectors(deployments []deployments.DeploymentInfo, ch chan<- prometheus.Metric) error {
var wg = &sync.WaitGroup{}
doneChannel := make(chan bool, 1)
errChannel := make(chan error, 1)
for _, collector := range c.enabledCollectors {
wg.Add(1)
go func(collector Collector) {
defer wg.Done()
if err := collector.Collect(deployments, ch); err != nil {
errChannel <- err
}
}(collector)
}
go func() {
wg.Wait()
close(doneChannel)
}()
select {
case <-doneChannel:
case err := <-errChannel:
return err
}
return nil
}