mirror of
https://github.com/prometheus/prometheus.git
synced 2024-09-20 07:47:31 -07:00
782d00059a
* discovery: factorize for SD based on refresh Signed-off-by: Simon Pasquier <spasquie@redhat.com> * discovery: use common metrics for refresh Signed-off-by: Simon Pasquier <spasquie@redhat.com>
118 lines
3 KiB
Go
118 lines
3 KiB
Go
// Copyright 2019 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package refresh
|
|
|
|
import (
|
|
"context"
|
|
"time"
|
|
|
|
"github.com/go-kit/kit/log"
|
|
"github.com/go-kit/kit/log/level"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
|
|
"github.com/prometheus/prometheus/discovery/targetgroup"
|
|
)
|
|
|
|
var (
|
|
failuresCount = prometheus.NewCounterVec(
|
|
prometheus.CounterOpts{
|
|
Name: "prometheus_sd_refresh_failures_total",
|
|
Help: "Number of refresh failures for the given SD mechanism.",
|
|
},
|
|
[]string{"mechanism"},
|
|
)
|
|
duration = prometheus.NewSummaryVec(
|
|
prometheus.SummaryOpts{
|
|
Name: "prometheus_sd_refresh_duration_seconds",
|
|
Help: "The duration of a refresh in seconds for the given SD mechanism.",
|
|
},
|
|
[]string{"mechanism"},
|
|
)
|
|
)
|
|
|
|
func init() {
|
|
prometheus.MustRegister(duration, failuresCount)
|
|
}
|
|
|
|
// Discovery implements the Discoverer interface.
|
|
type Discovery struct {
|
|
logger log.Logger
|
|
interval time.Duration
|
|
refreshf func(ctx context.Context) ([]*targetgroup.Group, error)
|
|
|
|
failures prometheus.Counter
|
|
duration prometheus.Observer
|
|
}
|
|
|
|
// NewDiscovery returns a Discoverer function that calls a refresh() function at every interval.
|
|
func NewDiscovery(l log.Logger, mech string, interval time.Duration, refreshf func(ctx context.Context) ([]*targetgroup.Group, error)) *Discovery {
|
|
if l == nil {
|
|
l = log.NewNopLogger()
|
|
}
|
|
return &Discovery{
|
|
logger: l,
|
|
interval: interval,
|
|
refreshf: refreshf,
|
|
failures: failuresCount.WithLabelValues(mech),
|
|
duration: duration.WithLabelValues(mech),
|
|
}
|
|
}
|
|
|
|
// Run implements the Discoverer interface.
|
|
func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
|
|
// Get an initial set right away.
|
|
tgs, err := d.refresh(ctx)
|
|
if err != nil {
|
|
level.Error(d.logger).Log("msg", "Unable to refresh target groups", "err", err.Error())
|
|
} else {
|
|
select {
|
|
case ch <- tgs:
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
|
|
ticker := time.NewTicker(d.interval)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-ticker.C:
|
|
tgs, err := d.refresh(ctx)
|
|
if err != nil {
|
|
level.Error(d.logger).Log("msg", "Unable to refresh target groups", "err", err.Error())
|
|
continue
|
|
}
|
|
|
|
select {
|
|
case ch <- tgs:
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
|
|
now := time.Now()
|
|
defer d.duration.Observe(time.Since(now).Seconds())
|
|
tgs, err := d.refreshf(ctx)
|
|
if err != nil {
|
|
d.failures.Inc()
|
|
}
|
|
return tgs, err
|
|
}
|