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provider.go
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provider.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 2016-present Datadog, Inc.
package pipeline
import (
"context"
"github.com/hashicorp/go-multierror"
"go.uber.org/atomic"
"github.com/DataDog/datadog-agent/comp/core/hostname/hostnameinterface"
"github.com/DataDog/datadog-agent/comp/logs/agent/config"
pkgconfigmodel "github.com/DataDog/datadog-agent/pkg/config/model"
"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/message"
"github.com/DataDog/datadog-agent/pkg/logs/sds"
"github.com/DataDog/datadog-agent/pkg/logs/status/statusinterface"
"github.com/DataDog/datadog-agent/pkg/util/log"
"github.com/DataDog/datadog-agent/pkg/util/startstop"
)
// Provider provides message channels
type Provider interface {
Start()
Stop()
ReconfigureSDSStandardRules(standardRules []byte) error
ReconfigureSDSAgentConfig(config []byte) error
NextPipelineChan() chan *message.Message
// Flush flushes all pipeline contained in this Provider
Flush(ctx context.Context)
}
// provider implements providing logic
type provider struct {
numberOfPipelines int
auditor auditor.Auditor
diagnosticMessageReceiver diagnostic.MessageReceiver
outputChan chan *message.Payload
processingRules []*config.ProcessingRule
endpoints *config.Endpoints
pipelines []*Pipeline
currentPipelineIndex *atomic.Uint32
destinationsContext *client.DestinationsContext
serverless bool
status statusinterface.Status
hostname hostnameinterface.Component
cfg pkgconfigmodel.Reader
}
// NewProvider returns a new Provider
func NewProvider(numberOfPipelines int, auditor auditor.Auditor, diagnosticMessageReceiver diagnostic.MessageReceiver, processingRules []*config.ProcessingRule, endpoints *config.Endpoints, destinationsContext *client.DestinationsContext, status statusinterface.Status, hostname hostnameinterface.Component, cfg pkgconfigmodel.Reader) Provider {
return newProvider(numberOfPipelines, auditor, diagnosticMessageReceiver, processingRules, endpoints, destinationsContext, false, status, hostname, cfg)
}
// NewServerlessProvider returns a new Provider in serverless mode
func NewServerlessProvider(numberOfPipelines int, auditor auditor.Auditor, processingRules []*config.ProcessingRule, endpoints *config.Endpoints, destinationsContext *client.DestinationsContext, status statusinterface.Status, hostname hostnameinterface.Component, cfg pkgconfigmodel.Reader) Provider {
return newProvider(numberOfPipelines, auditor, &diagnostic.NoopMessageReceiver{}, processingRules, endpoints, destinationsContext, true, status, hostname, cfg)
}
// NewMockProvider creates a new provider that will not provide any pipelines.
func NewMockProvider() Provider {
return &provider{}
}
func newProvider(numberOfPipelines int, auditor auditor.Auditor, diagnosticMessageReceiver diagnostic.MessageReceiver, processingRules []*config.ProcessingRule, endpoints *config.Endpoints, destinationsContext *client.DestinationsContext, serverless bool, status statusinterface.Status, hostname hostnameinterface.Component, cfg pkgconfigmodel.Reader) Provider {
return &provider{
numberOfPipelines: numberOfPipelines,
auditor: auditor,
diagnosticMessageReceiver: diagnosticMessageReceiver,
processingRules: processingRules,
endpoints: endpoints,
pipelines: []*Pipeline{},
currentPipelineIndex: atomic.NewUint32(0),
destinationsContext: destinationsContext,
serverless: serverless,
status: status,
hostname: hostname,
cfg: cfg,
}
}
// Start initializes the pipelines
func (p *provider) Start() {
// This requires the auditor to be started before.
p.outputChan = p.auditor.Channel()
for i := 0; i < p.numberOfPipelines; i++ {
pipeline := NewPipeline(p.outputChan, p.processingRules, p.endpoints, p.destinationsContext, p.diagnosticMessageReceiver, p.serverless, i, p.status, p.hostname, p.cfg)
pipeline.Start()
p.pipelines = append(p.pipelines, pipeline)
}
}
// Stop stops all pipelines in parallel,
// this call blocks until all pipelines are stopped
func (p *provider) Stop() {
stopper := startstop.NewParallelStopper()
for _, pipeline := range p.pipelines {
stopper.Add(pipeline)
}
stopper.Stop()
p.pipelines = p.pipelines[:0]
p.outputChan = nil
}
func (p *provider) reconfigureSDS(config []byte, orderType sds.ReconfigureOrderType) error {
var responses []chan error
// send a reconfiguration order to every running pipeline
for _, pipeline := range p.pipelines {
order := sds.ReconfigureOrder{
Type: orderType,
Config: config,
ResponseChan: make(chan error),
}
responses = append(responses, order.ResponseChan)
log.Debug("Sending SDS reconfiguration order:", string(order.Type))
pipeline.processor.ReconfigChan <- order
}
// reports if at least one error occurred
var rerr error
for _, response := range responses {
err := <-response
if err != nil {
rerr = multierror.Append(rerr, err)
}
close(response)
}
return rerr
}
// ReconfigureSDSStandardRules stores the SDS standard rules for the given provider.
func (p *provider) ReconfigureSDSStandardRules(standardRules []byte) error {
return p.reconfigureSDS(standardRules, sds.StandardRules)
}
// ReconfigureSDSAgentConfig reconfigures the pipeline with the given
// configuration received through Remote Configuration.
func (p *provider) ReconfigureSDSAgentConfig(config []byte) error {
return p.reconfigureSDS(config, sds.AgentConfig)
}
// NextPipelineChan returns the next pipeline input channel
func (p *provider) NextPipelineChan() chan *message.Message {
pipelinesLen := len(p.pipelines)
if pipelinesLen == 0 {
return nil
}
index := p.currentPipelineIndex.Inc() % uint32(pipelinesLen)
nextPipeline := p.pipelines[index]
return nextPipeline.InputChan
}
// Flush flushes synchronously all the contained pipeline of this provider.
func (p *provider) Flush(ctx context.Context) {
for _, p := range p.pipelines {
select {
case <-ctx.Done():
return
default:
p.Flush(ctx)
}
}
}