mirror of https://github.com/prometheus/prometheus
118 lines
2.8 KiB
Go
118 lines
2.8 KiB
Go
// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package refresh
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import (
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"context"
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"errors"
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"log/slog"
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"time"
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"github.com/prometheus/common/promslog"
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"github.com/prometheus/prometheus/discovery"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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)
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type Options struct {
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Logger *slog.Logger
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Mech string
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Interval time.Duration
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RefreshF func(ctx context.Context) ([]*targetgroup.Group, error)
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MetricsInstantiator discovery.RefreshMetricsInstantiator
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}
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// Discovery implements the Discoverer interface.
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type Discovery struct {
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logger *slog.Logger
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interval time.Duration
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refreshf func(ctx context.Context) ([]*targetgroup.Group, error)
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metrics *discovery.RefreshMetrics
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}
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// NewDiscovery returns a Discoverer function that calls a refresh() function at every interval.
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func NewDiscovery(opts Options) *Discovery {
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m := opts.MetricsInstantiator.Instantiate(opts.Mech)
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var logger *slog.Logger
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if opts.Logger == nil {
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logger = promslog.NewNopLogger()
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} else {
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logger = opts.Logger
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}
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d := Discovery{
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logger: logger,
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interval: opts.Interval,
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refreshf: opts.RefreshF,
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metrics: m,
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}
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return &d
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}
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// Run implements the Discoverer interface.
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func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
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// Get an initial set right away.
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tgs, err := d.refresh(ctx)
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if err != nil {
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if !errors.Is(ctx.Err(), context.Canceled) {
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d.logger.Error("Unable to refresh target groups", "err", err.Error())
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}
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} else {
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select {
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case ch <- tgs:
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case <-ctx.Done():
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return
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}
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}
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ticker := time.NewTicker(d.interval)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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tgs, err := d.refresh(ctx)
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if err != nil {
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if !errors.Is(ctx.Err(), context.Canceled) {
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d.logger.Error("Unable to refresh target groups", "err", err.Error())
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}
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continue
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}
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select {
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case ch <- tgs:
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case <-ctx.Done():
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return
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}
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case <-ctx.Done():
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return
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}
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}
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}
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func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
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now := time.Now()
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defer func() {
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d.metrics.Duration.Observe(time.Since(now).Seconds())
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}()
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tgs, err := d.refreshf(ctx)
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if err != nil {
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d.metrics.Failures.Inc()
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}
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return tgs, err
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}
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