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service.go
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service.go
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// Copyright © 2021 Weald Technology Trading.
// 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 prometheus
import (
"context"
"net/http"
"time"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/zerolog"
zerologger "github.com/rs/zerolog/log"
)
// Service is a metrics service exposing metrics via prometheus.
type Service struct{}
// module-wide log.
var log zerolog.Logger
// New creates a new prometheus metrics service.
func New(ctx context.Context, params ...Parameter) (*Service, error) {
parameters, err := parseAndCheckParameters(params...)
if err != nil {
return nil, errors.Wrap(err, "problem with parameters")
}
// Set logging.
log = zerologger.With().Str("service", "metrics").Str("impl", "prometheus").Logger()
if parameters.logLevel != log.GetLevel() {
log = log.Level(parameters.logLevel)
}
s := &Service{}
go func() {
http.Handle("/metrics", promhttp.Handler())
server := &http.Server{
Addr: parameters.address,
ReadHeaderTimeout: 5 * time.Second,
}
if err := server.ListenAndServe(); err != nil {
log.Warn().Str("metrics_address", parameters.address).Err(err).Msg("Failed to run metrics server")
}
}()
return s, nil
}
// Presenter returns the presenter for the events.
func (s *Service) Presenter() string {
return "prometheus"
}