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agent.go
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agent.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2023-present Datadog, Inc.
package agent
import (
"context"
"errors"
"fmt"
"time"
"github.com/hashicorp/go-multierror"
"go.uber.org/atomic"
"go.uber.org/fx"
configComponent "github.com/DataDog/datadog-agent/comp/core/config"
flaretypes "github.com/DataDog/datadog-agent/comp/core/flare/types"
"github.com/DataDog/datadog-agent/comp/core/hostname"
logComponent "github.com/DataDog/datadog-agent/comp/core/log"
statusComponent "github.com/DataDog/datadog-agent/comp/core/status"
"github.com/DataDog/datadog-agent/comp/core/workloadmeta"
"github.com/DataDog/datadog-agent/comp/logs/agent/config"
flareController "github.com/DataDog/datadog-agent/comp/logs/agent/flare"
"github.com/DataDog/datadog-agent/comp/metadata/inventoryagent"
rctypes "github.com/DataDog/datadog-agent/comp/remote-config/rcclient/types"
pkgConfig "github.com/DataDog/datadog-agent/pkg/config"
"github.com/DataDog/datadog-agent/pkg/logs/auditor"
"github.com/DataDog/datadog-agent/pkg/logs/client"
"github.com/DataDog/datadog-agent/pkg/logs/diagnostic"
"github.com/DataDog/datadog-agent/pkg/logs/launchers"
"github.com/DataDog/datadog-agent/pkg/logs/metrics"
"github.com/DataDog/datadog-agent/pkg/logs/pipeline"
"github.com/DataDog/datadog-agent/pkg/logs/schedulers"
"github.com/DataDog/datadog-agent/pkg/logs/sds"
"github.com/DataDog/datadog-agent/pkg/logs/service"
"github.com/DataDog/datadog-agent/pkg/logs/sources"
"github.com/DataDog/datadog-agent/pkg/logs/status"
"github.com/DataDog/datadog-agent/pkg/logs/tailers"
"github.com/DataDog/datadog-agent/pkg/remoteconfig/state"
"github.com/DataDog/datadog-agent/pkg/status/health"
"github.com/DataDog/datadog-agent/pkg/util"
"github.com/DataDog/datadog-agent/pkg/util/log"
"github.com/DataDog/datadog-agent/pkg/util/optional"
"github.com/DataDog/datadog-agent/pkg/util/startstop"
)
const (
// key used to display a warning message on the agent status
invalidProcessingRules = "invalid_global_processing_rules"
invalidEndpoints = "invalid_endpoints"
intakeTrackType = "logs"
// Log messages
multiLineWarning = "multi_line processing rules are not supported as global processing rules."
// inventory setting name
logsTransport = "logs_transport"
)
type dependencies struct {
fx.In
Lc fx.Lifecycle
Log logComponent.Component
Config configComponent.Component
InventoryAgent inventoryagent.Component
Hostname hostname.Component
WMeta optional.Option[workloadmeta.Component]
SchedulerProviders []schedulers.Scheduler `group:"log-agent-scheduler"`
}
type provides struct {
fx.Out
Comp optional.Option[Component]
FlareProvider flaretypes.Provider
StatusProvider statusComponent.InformationProvider
RCListener rctypes.ListenerProvider
}
// agent represents the data pipeline that collects, decodes,
// processes and sends logs to the backend. See the package README for
// a description of its operation.
type agent struct {
log logComponent.Component
config pkgConfig.Reader
inventoryAgent inventoryagent.Component
hostname hostname.Component
sources *sources.LogSources
services *service.Services
endpoints *config.Endpoints
tracker *tailers.TailerTracker
schedulers *schedulers.Schedulers
auditor auditor.Auditor
destinationsCtx *client.DestinationsContext
pipelineProvider pipeline.Provider
launchers *launchers.Launchers
health *health.Handle
diagnosticMessageReceiver *diagnostic.BufferedMessageReceiver
flarecontroller *flareController.FlareController
wmeta optional.Option[workloadmeta.Component]
schedulerProviders []schedulers.Scheduler
// started is true if the logs agent is running
started *atomic.Bool
}
func newLogsAgent(deps dependencies) provides {
if deps.Config.GetBool("logs_enabled") || deps.Config.GetBool("log_enabled") {
if deps.Config.GetBool("log_enabled") {
deps.Log.Warn(`"log_enabled" is deprecated, use "logs_enabled" instead`)
}
logsAgent := &agent{
log: deps.Log,
config: deps.Config,
inventoryAgent: deps.InventoryAgent,
hostname: deps.Hostname,
started: atomic.NewBool(false),
sources: sources.NewLogSources(),
services: service.NewServices(),
tracker: tailers.NewTailerTracker(),
flarecontroller: flareController.NewFlareController(),
wmeta: deps.WMeta,
schedulerProviders: deps.SchedulerProviders,
}
deps.Lc.Append(fx.Hook{
OnStart: logsAgent.start,
OnStop: logsAgent.stop,
})
var rcListener rctypes.ListenerProvider
if sds.SDSEnabled {
rcListener.ListenerProvider = rctypes.RCListener{
state.ProductSDSAgentConfig: logsAgent.onUpdateSDSAgentConfig,
state.ProductSDSRules: logsAgent.onUpdateSDSRules,
}
}
return provides{
Comp: optional.NewOption[Component](logsAgent),
StatusProvider: statusComponent.NewInformationProvider(NewStatusProvider()),
FlareProvider: flaretypes.NewProvider(logsAgent.flarecontroller.FillFlare),
RCListener: rcListener,
}
}
deps.Log.Info("logs-agent disabled")
return provides{
Comp: optional.NewNoneOption[Component](),
StatusProvider: statusComponent.NewInformationProvider(NewStatusProvider()),
}
}
func (a *agent) start(context.Context) error {
a.log.Info("Starting logs-agent...")
// setup the server config
endpoints, err := buildEndpoints(a.config)
if err != nil {
message := fmt.Sprintf("Invalid endpoints: %v", err)
status.AddGlobalError(invalidEndpoints, message)
return errors.New(message)
}
a.endpoints = endpoints
err = a.setupAgent()
if err != nil {
a.log.Error("Could not start logs-agent: ", err)
return err
}
a.startPipeline()
a.log.Info("logs-agent started")
for _, scheduler := range a.schedulerProviders {
a.AddScheduler(scheduler)
}
return nil
}
func (a *agent) setupAgent() error {
if a.endpoints.UseHTTP {
status.SetCurrentTransport(status.TransportHTTP)
} else {
status.SetCurrentTransport(status.TransportTCP)
}
// The severless agent doesn't use FX for now. This means that the logs agent will not have 'inventoryAgent'
// initialized for serverless. This is ok since metadata is not enabled for serverless.
// TODO: (components) - This condition should be removed once the serverless agent use FX.
if a.inventoryAgent != nil {
a.inventoryAgent.Set(logsTransport, string(status.GetCurrentTransport()))
}
// setup global processing rules
processingRules, err := config.GlobalProcessingRules(a.config)
if err != nil {
message := fmt.Sprintf("Invalid processing rules: %v", err)
status.AddGlobalError(invalidProcessingRules, message)
return errors.New(message)
}
if config.HasMultiLineRule(processingRules) {
a.log.Warn(multiLineWarning)
status.AddGlobalWarning(invalidProcessingRules, multiLineWarning)
}
a.SetupPipeline(processingRules, a.wmeta)
return nil
}
// Start starts all the elements of the data pipeline
// in the right order to prevent data loss
func (a *agent) startPipeline() {
a.started.Store(true)
// setup the status
status.Init(a.started, a.endpoints, a.sources, a.tracker, metrics.LogsExpvars)
starter := startstop.NewStarter(
a.destinationsCtx,
a.auditor,
a.pipelineProvider,
a.diagnosticMessageReceiver,
a.launchers,
a.schedulers,
)
starter.Start()
}
func (a *agent) stop(context.Context) error {
a.log.Info("Stopping logs-agent")
status.Clear()
stopper := startstop.NewSerialStopper(
a.schedulers,
a.launchers,
a.pipelineProvider,
a.auditor,
a.destinationsCtx,
a.diagnosticMessageReceiver,
)
// This will try to stop everything in order, including the potentially blocking
// parts like the sender. After StopTimeout it will just stop the last part of the
// pipeline, disconnecting it from the auditor, to make sure that the pipeline is
// flushed before stopping.
// TODO: Add this feature in the stopper.
c := make(chan struct{})
go func() {
stopper.Stop()
close(c)
}()
timeout := time.Duration(a.config.GetInt("logs_config.stop_grace_period")) * time.Second
select {
case <-c:
case <-time.After(timeout):
a.log.Info("Timed out when stopping logs-agent, forcing it to stop now")
// We force all destinations to read/flush all the messages they get without
// trying to write to the network.
a.destinationsCtx.Stop()
// Wait again for the stopper to complete.
// In some situation, the stopper unfortunately never succeed to complete,
// we've already reached the grace period, give it some more seconds and
// then force quit.
timeout := time.NewTimer(5 * time.Second)
select {
case <-c:
case <-timeout.C:
a.log.Warn("Force close of the Logs Agent, dumping the Go routines.")
if stack, err := util.GetGoRoutinesDump(); err != nil {
a.log.Warnf("can't get the Go routines dump: %s\n", err)
} else {
a.log.Warn(stack)
}
}
}
a.log.Info("logs-agent stopped")
return nil
}
// AddScheduler adds the given scheduler to the agent.
func (a *agent) AddScheduler(scheduler schedulers.Scheduler) {
a.schedulers.AddScheduler(scheduler)
}
func (a *agent) GetSources() *sources.LogSources {
return a.sources
}
func (a *agent) GetMessageReceiver() *diagnostic.BufferedMessageReceiver {
return a.diagnosticMessageReceiver
}
func (a *agent) GetPipelineProvider() pipeline.Provider {
return a.pipelineProvider
}
func (a *agent) onUpdateSDSRules(updates map[string]state.RawConfig, applyStateCallback func(string, state.ApplyStatus)) { //nolint:revive
var err error
for _, config := range updates {
if rerr := a.pipelineProvider.ReconfigureSDSStandardRules(config.Config); rerr != nil {
err = multierror.Append(err, rerr)
}
}
if err != nil {
log.Errorf("Can't update SDS standard rules: %v", err)
}
// Apply the new status to all configs
for cfgPath := range updates {
if err == nil {
applyStateCallback(cfgPath, state.ApplyStatus{State: state.ApplyStateAcknowledged})
} else {
applyStateCallback(cfgPath, state.ApplyStatus{
State: state.ApplyStateError,
Error: err.Error(),
})
}
}
}
func (a *agent) onUpdateSDSAgentConfig(updates map[string]state.RawConfig, applyStateCallback func(string, state.ApplyStatus)) { //nolint:revive
var err error
// We received a hit that new updates arrived, but if the list of updates
// is empty, it means we don't have any updates applying to this agent anymore
// Send a reconfiguration with an empty payload, indicating that
// the scanners have to be dropped.
if len(updates) == 0 {
err = a.pipelineProvider.ReconfigureSDSAgentConfig([]byte("{}"))
} else {
for _, config := range updates {
if rerr := a.pipelineProvider.ReconfigureSDSAgentConfig(config.Config); rerr != nil {
err = multierror.Append(err, rerr)
}
}
}
if err != nil {
log.Errorf("Can't update SDS configurations: %v", err)
}
// Apply the new status to all configs
for cfgPath := range updates {
if err == nil {
applyStateCallback(cfgPath, state.ApplyStatus{State: state.ApplyStateAcknowledged})
} else {
applyStateCallback(cfgPath, state.ApplyStatus{
State: state.ApplyStateError,
Error: err.Error(),
})
}
}
}