/
receiver.go
129 lines (111 loc) · 3.46 KB
/
receiver.go
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// Copyright observIQ, Inc.
//
// 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 pluginreceiver
import (
"context"
"fmt"
"time"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/exporter"
"go.opentelemetry.io/collector/otelcol"
"go.uber.org/zap"
)
// Receiver is a receiver that runs an embedded open telemetry config
// as an internal service.
type Receiver struct {
plugin *Plugin
renderedCfg *RenderedConfig
emitterFactory exporter.Factory
logger *zap.Logger
createService createServiceFunc
service Service
// serviceErrChan gets the error from the service once it stops running.
// If there is no error, `nil` is placed on the channel.
// It will be closed after the collector service shuts down.
serviceErrChan chan error
}
// NewReceiver creates a new plugin receiver
func NewReceiver(
plugin *Plugin,
renderedConfig *RenderedConfig,
emitterFactory exporter.Factory,
logger *zap.Logger,
) *Receiver {
return &Receiver{
plugin: plugin,
renderedCfg: renderedConfig,
emitterFactory: emitterFactory,
logger: logger,
createService: createService,
serviceErrChan: make(chan error, 1),
}
}
// Start starts the receiver's internal service
func (r *Receiver) Start(ctx context.Context, host component.Host) error {
r.logger.Info("Starting plugin...", zap.String("plugin", r.plugin.Title), zap.String("plugin-version", r.plugin.Version))
factories, err := r.renderedCfg.GetRequiredFactories(host, r.emitterFactory)
if err != nil {
return fmt.Errorf("failed to get factories from factory provider: %w", err)
}
cfgProvider, err := r.renderedCfg.GetConfigProvider()
if err != nil {
return fmt.Errorf("failed to get config provider: %w", err)
}
service, err := r.createService(*factories, cfgProvider, r.logger)
if err != nil {
return fmt.Errorf("failed to create internal service: %w", err)
}
r.service = service
if err := r.startService(ctx, service); err != nil {
return fmt.Errorf("failed to start internal service: %w", err)
}
return nil
}
// Shutdown stops the receiver's internal service
func (r *Receiver) Shutdown(ctx context.Context) error {
if r.service != nil {
r.service.Shutdown()
// Wait for service to actually shutdown, since shutdown is asynchronous
select {
case <-ctx.Done():
r.logger.Warn("Context done before service properly shut down.", zap.Error(ctx.Err()))
case err := <-r.serviceErrChan:
if err != nil {
return fmt.Errorf("shutdown service: %w", err)
}
}
}
return nil
}
// startService starts the provided service
func (r *Receiver) startService(ctx context.Context, svc Service) error {
go func() {
r.serviceErrChan <- svc.Run(ctx)
close(r.serviceErrChan)
}()
ticker := time.NewTicker(time.Millisecond * 250)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return ctx.Err()
case err := <-r.serviceErrChan:
return err
case <-ticker.C:
if svc.GetState() == otelcol.StateRunning {
return nil
}
}
}
}