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service.go
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service.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 service // import "go.opentelemetry.io/collector/service"
import (
"context"
"fmt"
"runtime"
"go.opentelemetry.io/otel/metric"
"go.uber.org/multierr"
"go.uber.org/zap"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config/configtelemetry"
"go.opentelemetry.io/collector/service/extensions"
"go.opentelemetry.io/collector/service/internal/pipelines"
"go.opentelemetry.io/collector/service/internal/proctelemetry"
"go.opentelemetry.io/collector/service/telemetry"
)
// service represents the implementation of a component.Host.
type service struct {
buildInfo component.BuildInfo
config *Config
telemetry *telemetry.Telemetry
telemetrySettings component.TelemetrySettings
host *serviceHost
telemetryInitializer *telemetryInitializer
}
func newService(set *settings) (*service, error) {
srv := &service{
buildInfo: set.BuildInfo,
config: set.Config,
host: &serviceHost{
factories: set.Factories,
buildInfo: set.BuildInfo,
asyncErrorChannel: set.AsyncErrorChannel,
},
telemetryInitializer: set.telemetry,
}
var err error
srv.telemetry, err = telemetry.New(context.Background(), telemetry.Settings{
ZapOptions: set.LoggingOptions}, set.Config.Service.Telemetry)
if err != nil {
return nil, fmt.Errorf("failed to get logger: %w", err)
}
srv.telemetrySettings = component.TelemetrySettings{
Logger: srv.telemetry.Logger(),
TracerProvider: srv.telemetry.TracerProvider(),
MeterProvider: metric.NewNoopMeterProvider(),
MetricsLevel: set.Config.Service.Telemetry.Metrics.Level,
}
if err = srv.telemetryInitializer.init(set.BuildInfo, srv.telemetrySettings.Logger, set.Config.Service.Telemetry, set.AsyncErrorChannel); err != nil {
return nil, fmt.Errorf("failed to initialize telemetry: %w", err)
}
srv.telemetrySettings.MeterProvider = srv.telemetryInitializer.mp
// process the configuration and initialize the pipeline
if err = srv.initExtensionsAndPipeline(set); err != nil {
// If pipeline initialization fails then shut down the telemetry server
if shutdownErr := srv.telemetryInitializer.shutdown(); shutdownErr != nil {
err = multierr.Append(err, fmt.Errorf("failed to shutdown collector telemetry: %w", shutdownErr))
}
return nil, err
}
return srv, nil
}
func (srv *service) Start(ctx context.Context) error {
srv.telemetrySettings.Logger.Info("Starting "+srv.buildInfo.Command+"...",
zap.String("Version", srv.buildInfo.Version),
zap.Int("NumCPU", runtime.NumCPU()),
)
if err := srv.host.extensions.Start(ctx, srv.host); err != nil {
return fmt.Errorf("failed to start extensions: %w", err)
}
if err := srv.host.pipelines.StartAll(ctx, srv.host); err != nil {
return fmt.Errorf("cannot start pipelines: %w", err)
}
if err := srv.host.extensions.NotifyPipelineReady(); err != nil {
return err
}
srv.telemetrySettings.Logger.Info("Everything is ready. Begin running and processing data.")
return nil
}
func (srv *service) Shutdown(ctx context.Context) error {
// Accumulate errors and proceed with shutting down remaining components.
var errs error
// Begin shutdown sequence.
srv.telemetrySettings.Logger.Info("Starting shutdown...")
if err := srv.host.extensions.NotifyPipelineNotReady(); err != nil {
errs = multierr.Append(errs, fmt.Errorf("failed to notify that pipeline is not ready: %w", err))
}
if err := srv.host.pipelines.ShutdownAll(ctx); err != nil {
errs = multierr.Append(errs, fmt.Errorf("failed to shutdown pipelines: %w", err))
}
if err := srv.host.extensions.Shutdown(ctx); err != nil {
errs = multierr.Append(errs, fmt.Errorf("failed to shutdown extensions: %w", err))
}
srv.telemetrySettings.Logger.Info("Shutdown complete.")
if err := srv.telemetry.Shutdown(ctx); err != nil {
errs = multierr.Append(errs, fmt.Errorf("failed to shutdown telemetry: %w", err))
}
// TODO: Shutdown MeterProvider.
return errs
}
func (srv *service) initExtensionsAndPipeline(set *settings) error {
var err error
extensionsSettings := extensions.Settings{
Telemetry: srv.telemetrySettings,
BuildInfo: srv.buildInfo,
Configs: srv.config.Extensions,
Factories: srv.host.factories.Extensions,
}
if srv.host.extensions, err = extensions.New(context.Background(), extensionsSettings, srv.config.Service.Extensions); err != nil {
return fmt.Errorf("failed build extensions: %w", err)
}
pipelinesSettings := pipelines.Settings{
Telemetry: srv.telemetrySettings,
BuildInfo: srv.buildInfo,
ReceiverFactories: srv.host.factories.Receivers,
ReceiverConfigs: srv.config.Receivers,
ProcessorFactories: srv.host.factories.Processors,
ProcessorConfigs: srv.config.Processors,
ExporterFactories: srv.host.factories.Exporters,
ExporterConfigs: srv.config.Exporters,
PipelineConfigs: srv.config.Service.Pipelines,
}
if srv.host.pipelines, err = pipelines.Build(context.Background(), pipelinesSettings); err != nil {
return fmt.Errorf("cannot build pipelines: %w", err)
}
if set.Config.Telemetry.Metrics.Level != configtelemetry.LevelNone && set.Config.Telemetry.Metrics.Address != "" {
// The process telemetry initialization requires the ballast size, which is available after the extensions are initialized.
if err = proctelemetry.RegisterProcessMetrics(srv.telemetryInitializer.ocRegistry, getBallastSize(srv.host)); err != nil {
return fmt.Errorf("failed to register process metrics: %w", err)
}
}
return nil
}