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factory.go
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factory.go
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// Copyright (c) 2021 The Jaeger 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 prometheus
import (
"flag"
"github.com/spf13/viper"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/trace"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/plugin"
prometheusstore "github.com/jaegertracing/jaeger/plugin/metrics/prometheus/metricsstore"
"github.com/jaegertracing/jaeger/storage/metricsstore"
)
var _ plugin.Configurable = (*Factory)(nil)
// Factory implements storage.Factory and creates storage components backed by memory store.
type Factory struct {
options *Options
logger *zap.Logger
tracer trace.TracerProvider
}
// NewFactory creates a new Factory.
func NewFactory() *Factory {
return &Factory{
tracer: otel.GetTracerProvider(),
options: NewOptions("prometheus"),
}
}
// AddFlags implements plugin.Configurable.
func (f *Factory) AddFlags(flagSet *flag.FlagSet) {
f.options.AddFlags(flagSet)
}
// InitFromViper implements plugin.Configurable.
func (f *Factory) InitFromViper(v *viper.Viper, logger *zap.Logger) {
if err := f.options.InitFromViper(v); err != nil {
logger.Panic("Failed to initialize metrics storage factory", zap.Error(err))
}
}
// Initialize implements storage.MetricsFactory.
func (f *Factory) Initialize(logger *zap.Logger) error {
f.logger = logger
return nil
}
// CreateMetricsReader implements storage.MetricsFactory.
func (f *Factory) CreateMetricsReader() (metricsstore.Reader, error) {
return prometheusstore.NewMetricsReader(f.options.Primary.Configuration, f.logger, f.tracer)
}