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receiver.go
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receiver.go
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// Copyright 2020 OpenTelemetry 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.
//go:build !windows
// +build !windows
package podmanreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/podmanreceiver"
import (
"context"
"fmt"
"sync"
"time"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/pdata/pmetric"
rcvr "go.opentelemetry.io/collector/receiver"
"go.opentelemetry.io/collector/receiver/scrapererror"
"go.opentelemetry.io/collector/receiver/scraperhelper"
"go.uber.org/multierr"
)
type receiver struct {
config *Config
set rcvr.CreateSettings
clientFactory clientFactory
scraper *ContainerScraper
}
func newReceiver(
_ context.Context,
set rcvr.CreateSettings,
config *Config,
nextConsumer consumer.Metrics,
clientFactory clientFactory,
) (rcvr.Metrics, error) {
err := config.Validate()
if err != nil {
return nil, err
}
if clientFactory == nil {
clientFactory = newLibpodClient
}
recv := &receiver{
config: config,
clientFactory: clientFactory,
set: set,
}
scrp, err := scraperhelper.NewScraper(typeStr, recv.scrape, scraperhelper.WithStart(recv.start))
if err != nil {
return nil, err
}
return scraperhelper.NewScraperControllerReceiver(&recv.config.ScraperControllerSettings, set, nextConsumer, scraperhelper.AddScraper(scrp))
}
func (r *receiver) start(ctx context.Context, _ component.Host) error {
var err error
podmanClient, err := r.clientFactory(r.set.Logger, r.config)
if err != nil {
return err
}
r.scraper = newContainerScraper(podmanClient, r.set.Logger, r.config)
if err = r.scraper.loadContainerList(ctx); err != nil {
return err
}
go r.scraper.containerEventLoop(ctx)
return nil
}
type result struct {
md pmetric.Metrics
err error
}
func (r *receiver) scrape(ctx context.Context) (pmetric.Metrics, error) {
containers := r.scraper.getContainers()
results := make(chan result, len(containers))
wg := &sync.WaitGroup{}
wg.Add(len(containers))
for _, c := range containers {
go func(c container) {
defer wg.Done()
stats, err := r.scraper.fetchContainerStats(ctx, c)
if err != nil {
results <- result{md: pmetric.Metrics{}, err: err}
return
}
results <- result{md: containerStatsToMetrics(time.Now(), c, &stats), err: nil}
}(c)
}
wg.Wait()
close(results)
var errs error
md := pmetric.NewMetrics()
for res := range results {
if res.err != nil {
// Don't know the number of failed metrics, but one container fetch is a partial error.
errs = multierr.Append(errs, scrapererror.NewPartialScrapeError(res.err, 0))
fmt.Println("No stats found!")
continue
}
res.md.ResourceMetrics().CopyTo(md.ResourceMetrics())
}
return md, nil
}