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instance.go
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/
instance.go
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package traces
import (
"context"
"fmt"
"sync"
"time"
"github.com/grafana/agent/pkg/build"
"github.com/grafana/agent/pkg/logs"
"github.com/grafana/agent/pkg/metrics/instance"
"github.com/grafana/agent/pkg/traces/contextkeys"
"github.com/grafana/agent/pkg/util"
"github.com/prometheus/client_golang/prometheus"
"go.opencensus.io/stats/view"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config"
"go.opentelemetry.io/collector/service/external/builder"
"go.opentelemetry.io/otel/trace"
"go.uber.org/zap"
)
// Instance wraps the OpenTelemetry collector to enable tracing pipelines
type Instance struct {
mut sync.Mutex
cfg InstanceConfig
logger *zap.Logger
metricViews []*view.View
exporter builder.Exporters
pipelines builder.BuiltPipelines
receivers builder.Receivers
}
// NewInstance creates and starts an instance of tracing pipelines.
func NewInstance(logsSubsystem *logs.Logs, reg prometheus.Registerer, cfg InstanceConfig, logger *zap.Logger, promInstanceManager instance.Manager) (*Instance, error) {
var err error
instance := &Instance{}
instance.logger = logger
instance.metricViews, err = newMetricViews(reg)
if err != nil {
return nil, fmt.Errorf("failed to create metric views: %w", err)
}
if err := instance.ApplyConfig(logsSubsystem, promInstanceManager, cfg); err != nil {
return nil, err
}
return instance, nil
}
// ApplyConfig updates the configuration of the Instance.
func (i *Instance) ApplyConfig(logsSubsystem *logs.Logs, promInstanceManager instance.Manager, cfg InstanceConfig) error {
i.mut.Lock()
defer i.mut.Unlock()
if util.CompareYAML(cfg, i.cfg) {
// No config change
return nil
}
i.cfg = cfg
// Shut down any existing pipeline
i.stop()
createCtx := context.WithValue(context.Background(), contextkeys.Logs, logsSubsystem)
err := i.buildAndStartPipeline(createCtx, cfg, promInstanceManager)
if err != nil {
return fmt.Errorf("failed to create pipeline: %w", err)
}
return nil
}
// Stop stops the OpenTelemetry collector subsystem
func (i *Instance) Stop() {
i.mut.Lock()
defer i.mut.Unlock()
i.stop()
view.Unregister(i.metricViews...)
}
func (i *Instance) stop() {
shutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
dependencies := []struct {
name string
shutdown func() error
}{
{
name: "receiver",
shutdown: func() error {
if i.receivers == nil {
return nil
}
return i.receivers.ShutdownAll(shutdownCtx)
},
},
{
name: "processors",
shutdown: func() error {
if i.pipelines == nil {
return nil
}
return i.pipelines.ShutdownProcessors(shutdownCtx)
},
},
{
name: "exporters",
shutdown: func() error {
if i.exporter == nil {
return nil
}
return i.exporter.ShutdownAll(shutdownCtx)
},
},
}
for _, dep := range dependencies {
i.logger.Info(fmt.Sprintf("shutting down %s", dep.name))
if err := dep.shutdown(); err != nil {
i.logger.Error(fmt.Sprintf("failed to shutdown %s", dep.name), zap.Error(err))
}
}
i.receivers = nil
i.pipelines = nil
i.exporter = nil
}
func (i *Instance) buildAndStartPipeline(ctx context.Context, cfg InstanceConfig, promManager instance.Manager) error {
// create component factories
otelConfig, err := cfg.otelConfig()
if err != nil {
return fmt.Errorf("failed to load otelConfig from agent traces config: %w", err)
}
if cfg.PushConfig.Endpoint != "" {
i.logger.Warn("Configuring exporter with deprecated push_config. Use remote_write and batch instead")
}
for _, rw := range cfg.RemoteWrite {
if rw.InsecureSkipVerify {
i.logger.Warn("Configuring TLS with insecure_skip_verify. Use tls_config.insecure_skip_verify instead")
}
if rw.TLSConfig != nil && rw.TLSConfig.ServerName != "" {
i.logger.Warn("Configuring unsupported tls_config.server_name")
}
}
if cfg.SpanMetrics != nil && len(cfg.SpanMetrics.MetricsInstance) != 0 {
ctx = context.WithValue(ctx, contextkeys.Metrics, promManager)
}
if cfg.TailSampling != nil && cfg.LoadBalancing == nil {
i.logger.Warn("Configuring tail_sampling without load_balance." +
"Load balancing is required for tail sampling to properly work in multi instance deployments")
}
factories, err := tracingFactories()
if err != nil {
return fmt.Errorf("failed to load tracing factories: %w", err)
}
appinfo := component.BuildInfo{
Command: "agent",
Description: "agent",
Version: build.Version,
}
// start exporter
i.exporter, err = builder.BuildExporters(i.logger, trace.NewNoopTracerProvider(), appinfo, otelConfig, factories.Exporters)
if err != nil {
return fmt.Errorf("failed to create exporters builder: %w", err)
}
err = i.exporter.StartAll(ctx, i)
if err != nil {
return fmt.Errorf("failed to start exporters: %w", err)
}
// start pipelines
i.pipelines, err = builder.BuildPipelines(i.logger, trace.NewNoopTracerProvider(), appinfo, otelConfig, i.exporter, factories.Processors)
if err != nil {
return fmt.Errorf("failed to create pipelines builder: %w", err)
}
err = i.pipelines.StartProcessors(ctx, i)
if err != nil {
return fmt.Errorf("failed to start processors: %w", err)
}
// start receivers
i.receivers, err = builder.BuildReceivers(i.logger, trace.NewNoopTracerProvider(), appinfo, otelConfig, i.pipelines, factories.Receivers)
if err != nil {
return fmt.Errorf("failed to create receivers builder: %w", err)
}
err = i.receivers.StartAll(ctx, i)
if err != nil {
return fmt.Errorf("failed to start receivers: %w", err)
}
return nil
}
// ReportFatalError implements component.Host
func (i *Instance) ReportFatalError(err error) {
i.logger.Error("fatal error reported", zap.Error(err))
}
// GetFactory implements component.Host
func (i *Instance) GetFactory(component.Kind, config.Type) component.Factory {
return nil
}
// GetExtensions implements component.Host
func (i *Instance) GetExtensions() map[config.ComponentID]component.Extension {
return nil
}
// GetExporters implements component.Host
func (i *Instance) GetExporters() map[config.DataType]map[config.ComponentID]component.Exporter {
// SpanMetricsProcessor needs to get the configured exporters.
return i.exporter.ToMapByDataType()
}