traefik/pkg/provider/aggregator/aggregator.go

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package aggregator
import (
"encoding/json"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
"github.com/traefik/traefik/v2/pkg/config/static"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/provider"
"github.com/traefik/traefik/v2/pkg/provider/file"
"github.com/traefik/traefik/v2/pkg/provider/traefik"
"github.com/traefik/traefik/v2/pkg/safe"
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)
// ProviderAggregator aggregates providers.
type ProviderAggregator struct {
internalProvider provider.Provider
fileProvider provider.Provider
providers []provider.Provider
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}
// NewProviderAggregator returns an aggregate of all the providers configured in the static configuration.
func NewProviderAggregator(conf static.Providers) ProviderAggregator {
p := ProviderAggregator{}
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if conf.File != nil {
p.quietAddProvider(conf.File)
}
if conf.Docker != nil {
p.quietAddProvider(conf.Docker)
}
if conf.Marathon != nil {
p.quietAddProvider(conf.Marathon)
}
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if conf.Rest != nil {
p.quietAddProvider(conf.Rest)
}
if conf.KubernetesIngress != nil {
p.quietAddProvider(conf.KubernetesIngress)
}
if conf.KubernetesCRD != nil {
p.quietAddProvider(conf.KubernetesCRD)
}
if conf.KubernetesGateway != nil {
p.quietAddProvider(conf.KubernetesGateway)
}
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if conf.Rancher != nil {
p.quietAddProvider(conf.Rancher)
}
if conf.Ecs != nil {
p.quietAddProvider(conf.Ecs)
}
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if conf.ConsulCatalog != nil {
p.quietAddProvider(conf.ConsulCatalog)
}
if conf.Consul != nil {
p.quietAddProvider(conf.Consul)
}
if conf.Etcd != nil {
p.quietAddProvider(conf.Etcd)
}
if conf.ZooKeeper != nil {
p.quietAddProvider(conf.ZooKeeper)
}
if conf.Redis != nil {
p.quietAddProvider(conf.Redis)
}
if conf.HTTP != nil {
p.quietAddProvider(conf.HTTP)
}
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return p
}
func (p *ProviderAggregator) quietAddProvider(provider provider.Provider) {
err := p.AddProvider(provider)
if err != nil {
log.WithoutContext().Errorf("Error while initializing provider %T: %v", provider, err)
}
}
// AddProvider adds a provider in the providers map.
func (p *ProviderAggregator) AddProvider(provider provider.Provider) error {
err := provider.Init()
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if err != nil {
return err
}
switch provider.(type) {
case *file.Provider:
p.fileProvider = provider
case *traefik.Provider:
p.internalProvider = provider
default:
p.providers = append(p.providers, provider)
}
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return nil
}
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// Init the provider.
func (p ProviderAggregator) Init() error {
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return nil
}
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// Provide calls the provide method of every providers.
func (p ProviderAggregator) Provide(configurationChan chan<- dynamic.Message, pool *safe.Pool) error {
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if p.fileProvider != nil {
launchProvider(configurationChan, pool, p.fileProvider)
}
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for _, prd := range p.providers {
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prd := prd
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safe.Go(func() {
launchProvider(configurationChan, pool, prd)
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})
}
// internal provider must be the last because we use it to know if all the providers are loaded.
// ConfigurationWatcher will wait for this requiredProvider before applying configurations.
if p.internalProvider != nil {
launchProvider(configurationChan, pool, p.internalProvider)
}
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return nil
}
func launchProvider(configurationChan chan<- dynamic.Message, pool *safe.Pool, prd provider.Provider) {
jsonConf, err := json.Marshal(prd)
if err != nil {
log.WithoutContext().Debugf("Cannot marshal the provider configuration %T: %v", prd, err)
}
log.WithoutContext().Infof("Starting provider %T %s", prd, jsonConf)
currentProvider := prd
err = currentProvider.Provide(configurationChan, pool)
if err != nil {
log.WithoutContext().Errorf("Cannot start the provider %T: %v", prd, err)
}
}