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server.go
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server.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 2022-present Datadog, Inc.
package server
import (
"context"
"errors"
"net/http"
"time"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.uber.org/fx"
"github.com/DataDog/datadog-agent/comp/aggregator/demultiplexer"
"github.com/DataDog/datadog-agent/comp/core/hostname"
"github.com/DataDog/datadog-agent/comp/core/log"
"github.com/DataDog/datadog-agent/comp/core/status"
"github.com/DataDog/datadog-agent/comp/ndmtmp/forwarder"
nfconfig "github.com/DataDog/datadog-agent/comp/netflow/config"
"github.com/DataDog/datadog-agent/comp/netflow/flowaggregator"
)
type dependencies struct {
fx.In
Config nfconfig.Component
Logger log.Component
Demultiplexer demultiplexer.Component
Forwarder forwarder.Component
Hostname hostname.Component
}
type provides struct {
fx.Out
Comp Component
StatusProvider status.InformationProvider
}
// newServer configures a netflow server.
func newServer(lc fx.Lifecycle, deps dependencies) (provides, error) {
conf := deps.Config.Get()
sender, err := deps.Demultiplexer.GetDefaultSender()
if err != nil {
return provides{}, err
}
flowAgg := flowaggregator.NewFlowAggregator(sender, deps.Forwarder, conf, deps.Hostname.GetSafe(context.Background()), deps.Logger)
server := &Server{
config: conf,
FlowAgg: flowAgg,
logger: deps.Logger,
}
var statusProvider status.Provider
if conf.Enabled {
statusProvider = Provider{
server: server,
}
// netflow is enabled, so start the server
lc.Append(fx.Hook{
OnStart: func(ctx context.Context) error {
err := server.Start()
return err
},
OnStop: func(context.Context) error {
server.Stop()
return nil
},
})
}
return provides{
Comp: server,
StatusProvider: status.NewInformationProvider(statusProvider),
}, nil
}
// Server manages netflow listeners.
type Server struct {
Addr string
config *nfconfig.NetflowConfig
listeners []*netflowListener
FlowAgg *flowaggregator.FlowAggregator
logger log.Component
running bool
}
// Start starts the server running
func (s *Server) Start() error {
if s.running {
return errors.New("server already started")
}
s.running = true
go s.FlowAgg.Start()
if s.config.PrometheusListenerEnabled {
go func() {
serverMux := http.NewServeMux()
serverMux.Handle("/metrics", promhttp.Handler())
err := http.ListenAndServe(s.config.PrometheusListenerAddress, serverMux)
if err != nil {
s.logger.Errorf("error starting prometheus server `%s`", s.config.PrometheusListenerAddress)
}
}()
}
s.logger.Debugf("NetFlow Server configs (aggregator_buffer_size=%d, aggregator_flush_interval=%d, aggregator_flow_context_ttl=%d)", s.config.AggregatorBufferSize, s.config.AggregatorFlushInterval, s.config.AggregatorFlowContextTTL)
for _, listenerConfig := range s.config.Listeners {
s.logger.Infof("Starting Netflow listener for flow type %s on %s", listenerConfig.FlowType, listenerConfig.Addr())
listener, err := startFlowListener(listenerConfig, s.FlowAgg, s.logger)
if err != nil {
s.logger.Warnf("Error starting listener for config (flow_type:%s, bind_Host:%s, port:%d): %s", listenerConfig.FlowType, listenerConfig.BindHost, listenerConfig.Port, err)
continue
}
s.listeners = append(s.listeners, listener)
}
return nil
}
// Stop stops the Server.
func (s *Server) Stop() {
s.logger.Infof("Stop NetFlow Server")
if !s.running {
return
}
s.FlowAgg.Stop()
for _, listener := range s.listeners {
stopped := make(chan interface{})
go func() {
s.logger.Infof("Listener `%s` shutting down", listener.config.Addr())
close(stopped)
}()
select {
case <-stopped:
s.logger.Infof("Listener `%s` stopped", listener.config.Addr())
case <-time.After(time.Duration(s.config.StopTimeout) * time.Second):
s.logger.Errorf("Stopping listener `%s`. Timeout after %d seconds", listener.config.Addr(), s.config.StopTimeout)
}
}
s.running = false
}