traefik/pkg/provider/aggregator/aggregator.go

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package aggregator
import (
"encoding/json"
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"github.com/containous/traefik/pkg/config"
"github.com/containous/traefik/pkg/config/static"
"github.com/containous/traefik/pkg/log"
"github.com/containous/traefik/pkg/provider"
"github.com/containous/traefik/pkg/provider/file"
"github.com/containous/traefik/pkg/safe"
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)
// ProviderAggregator aggregates providers.
type ProviderAggregator struct {
fileProvider *file.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.Kubernetes != nil {
p.quietAddProvider(conf.Kubernetes)
}
if conf.KubernetesCRD != nil {
p.quietAddProvider(conf.KubernetesCRD)
}
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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
}
if fileProvider, ok := provider.(*file.Provider); ok {
p.fileProvider = fileProvider
} else {
p.providers = append(p.providers, provider)
}
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return nil
}
// Init the provider
func (p ProviderAggregator) Init() error {
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return nil
}
// Provide calls the provide method of every providers
func (p ProviderAggregator) Provide(configurationChan chan<- config.Message, pool *safe.Pool) error {
if p.fileProvider != nil {
launchProvider(configurationChan, pool, p.fileProvider)
}
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for _, prd := range p.providers {
safe.Go(func() {
launchProvider(configurationChan, pool, prd)
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})
}
return nil
}
func launchProvider(configurationChan chan<- config.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)
}
}