zrepl/daemon/prometheus.go

90 lines
2.0 KiB
Go

package daemon
import (
"context"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/zrepl/zrepl/config"
"github.com/zrepl/zrepl/daemon/job"
"github.com/zrepl/zrepl/logger"
"github.com/zrepl/zrepl/zfs"
"net"
"net/http"
)
type prometheusJob struct {
listen string
}
func newPrometheusJobFromConfig(in *config.PrometheusMonitoring) (*prometheusJob, error) {
if _, _, err := net.SplitHostPort(in.Listen); err != nil {
return nil, err
}
return &prometheusJob{in.Listen}, nil
}
var prom struct {
taskLogEntries *prometheus.CounterVec
}
func init() {
prom.taskLogEntries = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: "zrepl",
Subsystem: "daemon",
Name: "log_entries",
Help: "number of log entries per job task and level",
}, []string{"zrepl_job", "level"})
prometheus.MustRegister(prom.taskLogEntries)
}
func (j *prometheusJob) Name() string { return jobNamePrometheus }
func (j *prometheusJob) Status() interface{} { return nil }
func (j *prometheusJob) RegisterMetrics(registerer prometheus.Registerer) {}
func (j *prometheusJob) Run(ctx context.Context) {
if err := zfs.PrometheusRegister(prometheus.DefaultRegisterer); err != nil {
panic(err)
}
log := job.GetLogger(ctx)
l, err := net.Listen("tcp", j.listen)
if err != nil {
log.WithError(err).Error("cannot listen")
}
go func() {
select {
case <-ctx.Done():
l.Close()
}
}()
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
err = http.Serve(l, mux)
if err != nil {
log.WithError(err).Error("error while serving")
}
}
type prometheusJobOutlet struct {
jobName string
}
var _ logger.Outlet = prometheusJobOutlet{}
func newPrometheusLogOutlet(jobName string) prometheusJobOutlet {
return prometheusJobOutlet{jobName}
}
func (o prometheusJobOutlet) WriteEntry(entry logger.Entry) error {
prom.taskLogEntries.WithLabelValues(o.jobName, entry.Level.String()).Inc()
return nil
}