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prometheus.go
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prometheus.go
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// Copyright The 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.
package prometheusexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/prometheusexporter"
import (
"context"
"errors"
"net"
"net/http"
"strings"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/pdata/pmetric"
)
type prometheusExporter struct {
name string
endpoint string
shutdownFunc func() error
handler http.Handler
collector *collector
registry *prometheus.Registry
}
var errBlankPrometheusAddress = errors.New("expecting a non-blank address to run the Prometheus metrics handler")
func newPrometheusExporter(config *Config, set component.ExporterCreateSettings) (*prometheusExporter, error) {
addr := strings.TrimSpace(config.Endpoint)
if strings.TrimSpace(config.Endpoint) == "" {
return nil, errBlankPrometheusAddress
}
collector := newCollector(config, set.Logger)
registry := prometheus.NewRegistry()
_ = registry.Register(collector)
return &prometheusExporter{
name: config.ID().String(),
endpoint: addr,
collector: collector,
registry: registry,
shutdownFunc: func() error { return nil },
handler: promhttp.HandlerFor(
registry,
promhttp.HandlerOpts{
ErrorHandling: promhttp.ContinueOnError,
ErrorLog: newPromLogger(set.Logger),
EnableOpenMetrics: config.EnableOpenMetrics,
},
),
}, nil
}
func (pe *prometheusExporter) Start(_ context.Context, _ component.Host) error {
ln, err := net.Listen("tcp", pe.endpoint)
if err != nil {
return err
}
pe.shutdownFunc = ln.Close
mux := http.NewServeMux()
mux.Handle("/metrics", pe.handler)
srv := &http.Server{Handler: mux}
go func() {
_ = srv.Serve(ln)
}()
return nil
}
func (pe *prometheusExporter) ConsumeMetrics(_ context.Context, md pmetric.Metrics) error {
n := 0
rmetrics := md.ResourceMetrics()
for i := 0; i < rmetrics.Len(); i++ {
n += pe.collector.processMetrics(rmetrics.At(i))
}
return nil
}
func (pe *prometheusExporter) Shutdown(context.Context) error {
return pe.shutdownFunc()
}