mirror of
https://github.com/containous/traefik.git
synced 2024-12-24 21:34:39 +03:00
200 lines
4.7 KiB
Go
200 lines
4.7 KiB
Go
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package provider
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import (
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"errors"
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"strings"
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"text/template"
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"time"
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log "github.com/Sirupsen/logrus"
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"github.com/cenkalti/backoff"
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"github.com/emilevauge/traefik/types"
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"github.com/hashicorp/consul/api"
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)
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const (
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// DefaultWatchWaitTime is the duration to wait when polling consul
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DefaultWatchWaitTime = 15 * time.Second
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)
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// ConsulCatalog holds configurations of the Consul catalog provider.
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type ConsulCatalog struct {
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BaseProvider `mapstructure:",squash"`
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Endpoint string
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Domain string
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client *api.Client
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}
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type catalogUpdate struct {
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Service string
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Nodes []*api.ServiceEntry
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}
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func (provider *ConsulCatalog) watchServices(stopCh <-chan struct{}) <-chan map[string][]string {
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watchCh := make(chan map[string][]string)
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catalog := provider.client.Catalog()
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go func() {
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defer close(watchCh)
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opts := &api.QueryOptions{WaitTime: DefaultWatchWaitTime}
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for {
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select {
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case <-stopCh:
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return
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default:
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}
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data, meta, err := catalog.Services(opts)
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if err != nil {
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log.WithError(err).Errorf("Failed to list services")
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return
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}
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// If LastIndex didn't change then it means `Get` returned
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// because of the WaitTime and the key didn't changed.
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if opts.WaitIndex == meta.LastIndex {
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continue
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}
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opts.WaitIndex = meta.LastIndex
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if data != nil {
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watchCh <- data
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}
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}
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}()
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return watchCh
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}
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func (provider *ConsulCatalog) healthyNodes(service string) (catalogUpdate, error) {
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health := provider.client.Health()
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opts := &api.QueryOptions{}
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data, _, err := health.Service(service, "", true, opts)
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if err != nil {
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log.WithError(err).Errorf("Failed to fetch details of " + service)
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return catalogUpdate{}, err
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}
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return catalogUpdate{
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Service: service,
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Nodes: data,
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}, nil
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}
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func (provider *ConsulCatalog) getBackend(node *api.ServiceEntry) string {
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return strings.ToLower(node.Service.Service)
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}
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func (provider *ConsulCatalog) getFrontendValue(service string) string {
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return service + "." + provider.Domain
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}
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func (provider *ConsulCatalog) buildConfig(catalog []catalogUpdate) *types.Configuration {
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var FuncMap = template.FuncMap{
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"getBackend": provider.getBackend,
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"getFrontendValue": provider.getFrontendValue,
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"replace": replace,
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}
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allNodes := []*api.ServiceEntry{}
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serviceNames := []string{}
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for _, info := range catalog {
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if len(info.Nodes) > 0 {
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serviceNames = append(serviceNames, info.Service)
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allNodes = append(allNodes, info.Nodes...)
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}
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}
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templateObjects := struct {
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Services []string
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Nodes []*api.ServiceEntry
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}{
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Services: serviceNames,
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Nodes: allNodes,
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}
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configuration, err := provider.getConfiguration("templates/consul_catalog.tmpl", FuncMap, templateObjects)
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if err != nil {
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log.WithError(err).Error("Failed to create config")
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}
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return configuration
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}
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func (provider *ConsulCatalog) getNodes(index map[string][]string) ([]catalogUpdate, error) {
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visited := make(map[string]bool)
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nodes := []catalogUpdate{}
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for service := range index {
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name := strings.ToLower(service)
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if !strings.Contains(name, " ") && !visited[name] {
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visited[name] = true
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log.WithFields(log.Fields{
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"service": name,
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}).Debug("Fetching service")
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healthy, err := provider.healthyNodes(name)
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if err != nil {
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return nil, err
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}
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nodes = append(nodes, healthy)
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}
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}
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return nodes, nil
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}
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func (provider *ConsulCatalog) watch(configurationChan chan<- types.ConfigMessage) error {
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stopCh := make(chan struct{})
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serviceCatalog := provider.watchServices(stopCh)
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defer close(stopCh)
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for {
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select {
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case index, ok := <-serviceCatalog:
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if !ok {
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return errors.New("Consul service list nil")
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}
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log.Debug("List of services changed")
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nodes, err := provider.getNodes(index)
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if err != nil {
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return err
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}
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configuration := provider.buildConfig(nodes)
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configurationChan <- types.ConfigMessage{
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ProviderName: "consul_catalog",
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Configuration: configuration,
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}
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}
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}
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}
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// Provide allows the provider to provide configurations to traefik
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// using the given configuration channel.
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func (provider *ConsulCatalog) Provide(configurationChan chan<- types.ConfigMessage) error {
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config := api.DefaultConfig()
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config.Address = provider.Endpoint
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client, err := api.NewClient(config)
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if err != nil {
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return err
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}
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provider.client = client
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go func() {
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notify := func(err error, time time.Duration) {
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log.Errorf("Consul connection error %+v, retrying in %s", err, time)
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}
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worker := func() error {
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return provider.watch(configurationChan)
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}
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err := backoff.RetryNotify(worker, backoff.NewExponentialBackOff(), notify)
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if err != nil {
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log.Fatalf("Cannot connect to consul server %+v", err)
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}
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}()
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return err
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}
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