650 lines
20 KiB
Go
650 lines
20 KiB
Go
package provider
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import (
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"errors"
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"math"
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"net"
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"net/http"
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"strconv"
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"strings"
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"text/template"
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"time"
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"golang.org/x/net/context"
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"github.com/BurntSushi/ty/fun"
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"github.com/cenk/backoff"
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"github.com/containous/traefik/job"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/safe"
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"github.com/containous/traefik/types"
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"github.com/containous/traefik/version"
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"github.com/docker/engine-api/client"
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dockertypes "github.com/docker/engine-api/types"
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dockercontainertypes "github.com/docker/engine-api/types/container"
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eventtypes "github.com/docker/engine-api/types/events"
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"github.com/docker/engine-api/types/filters"
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"github.com/docker/engine-api/types/swarm"
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swarmtypes "github.com/docker/engine-api/types/swarm"
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"github.com/docker/go-connections/nat"
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"github.com/docker/go-connections/sockets"
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"github.com/vdemeester/docker-events"
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)
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const (
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// DockerAPIVersion is a constant holding the version of the Docker API traefik will use
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DockerAPIVersion string = "1.21"
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// SwarmAPIVersion is a constant holding the version of the Docker API traefik will use
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SwarmAPIVersion string = "1.24"
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// SwarmDefaultWatchTime is the duration of the interval when polling docker
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SwarmDefaultWatchTime = 15 * time.Second
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)
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var _ Provider = (*Docker)(nil)
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// Docker holds configurations of the Docker provider.
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type Docker struct {
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BaseProvider `mapstructure:",squash"`
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Endpoint string `description:"Docker server endpoint. Can be a tcp or a unix socket endpoint"`
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Domain string `description:"Default domain used"`
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TLS *ClientTLS `description:"Enable Docker TLS support"`
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ExposedByDefault bool `description:"Expose containers by default"`
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UseBindPortIP bool `description:"Use the ip address from the bound port, rather than from the inner network"`
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SwarmMode bool `description:"Use Docker on Swarm Mode"`
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}
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// dockerData holds the need data to the Docker provider
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type dockerData struct {
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Name string
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Labels map[string]string // List of labels set to container or service
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NetworkSettings networkSettings
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}
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// NetworkSettings holds the networks data to the Docker provider
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type networkSettings struct {
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NetworkMode dockercontainertypes.NetworkMode
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Ports nat.PortMap
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Networks map[string]*networkData
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}
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// Network holds the network data to the Docker provider
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type networkData struct {
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Name string
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Addr string
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Port int
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Protocol string
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ID string
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}
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func (provider *Docker) createClient() (client.APIClient, error) {
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var httpClient *http.Client
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httpHeaders := map[string]string{
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"User-Agent": "Traefik " + version.Version,
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}
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if provider.TLS != nil {
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config, err := provider.TLS.CreateTLSConfig()
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if err != nil {
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return nil, err
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}
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tr := &http.Transport{
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TLSClientConfig: config,
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}
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proto, addr, _, err := client.ParseHost(provider.Endpoint)
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if err != nil {
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return nil, err
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}
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sockets.ConfigureTransport(tr, proto, addr)
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httpClient = &http.Client{
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Transport: tr,
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}
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}
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var version string
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if provider.SwarmMode {
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version = SwarmAPIVersion
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} else {
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version = DockerAPIVersion
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}
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return client.NewClient(provider.Endpoint, version, httpClient, httpHeaders)
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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 *Docker) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints []types.Constraint) error {
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provider.Constraints = append(provider.Constraints, constraints...)
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// TODO register this routine in pool, and watch for stop channel
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safe.Go(func() {
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operation := func() error {
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var err error
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dockerClient, err := provider.createClient()
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if err != nil {
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log.Errorf("Failed to create a client for docker, error: %s", err)
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return err
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}
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ctx := context.Background()
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version, err := dockerClient.ServerVersion(ctx)
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log.Debugf("Docker connection established with docker %s (API %s)", version.Version, version.APIVersion)
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var dockerDataList []dockerData
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if provider.SwarmMode {
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dockerDataList, err = listServices(ctx, dockerClient)
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if err != nil {
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log.Errorf("Failed to list services for docker swarm mode, error %s", err)
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return err
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}
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} else {
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dockerDataList, err = listContainers(ctx, dockerClient)
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if err != nil {
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log.Errorf("Failed to list containers for docker, error %s", err)
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return err
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}
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}
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configuration := provider.loadDockerConfig(dockerDataList)
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configurationChan <- types.ConfigMessage{
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ProviderName: "docker",
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Configuration: configuration,
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}
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if provider.Watch {
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ctx, cancel := context.WithCancel(ctx)
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if provider.SwarmMode {
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// TODO: This need to be change. Linked to Swarm events docker/docker#23827
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ticker := time.NewTicker(SwarmDefaultWatchTime)
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pool.Go(func(stop chan bool) {
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for {
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select {
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case <-ticker.C:
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services, err := listServices(ctx, dockerClient)
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if err != nil {
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log.Errorf("Failed to list services for docker, error %s", err)
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return
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}
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configuration := provider.loadDockerConfig(services)
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if configuration != nil {
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configurationChan <- types.ConfigMessage{
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ProviderName: "docker",
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Configuration: configuration,
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}
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}
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case <-stop:
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ticker.Stop()
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cancel()
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return
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}
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}
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})
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} else {
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pool.Go(func(stop chan bool) {
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for {
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select {
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case <-stop:
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cancel()
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return
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}
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}
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})
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f := filters.NewArgs()
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f.Add("type", "container")
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options := dockertypes.EventsOptions{
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Filters: f,
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}
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eventHandler := events.NewHandler(events.ByAction)
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startStopHandle := func(m eventtypes.Message) {
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log.Debugf("Docker event received %+v", m)
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containers, err := listContainers(ctx, dockerClient)
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if err != nil {
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log.Errorf("Failed to list containers for docker, error %s", err)
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// Call cancel to get out of the monitor
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cancel()
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return
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}
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configuration := provider.loadDockerConfig(containers)
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if configuration != nil {
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configurationChan <- types.ConfigMessage{
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ProviderName: "docker",
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Configuration: configuration,
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}
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}
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}
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eventHandler.Handle("start", startStopHandle)
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eventHandler.Handle("die", startStopHandle)
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errChan := events.MonitorWithHandler(ctx, dockerClient, options, eventHandler)
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if err := <-errChan; err != nil {
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return err
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}
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}
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}
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return nil
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}
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notify := func(err error, time time.Duration) {
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log.Errorf("Docker connection error %+v, retrying in %s", err, time)
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}
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err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
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if err != nil {
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log.Errorf("Cannot connect to docker server %+v", err)
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}
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})
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return nil
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}
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func (provider *Docker) loadDockerConfig(containersInspected []dockerData) *types.Configuration {
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var DockerFuncMap = template.FuncMap{
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"getBackend": provider.getBackend,
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"getIPAddress": provider.getIPAddress,
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"getPort": provider.getPort,
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"getWeight": provider.getWeight,
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"getDomain": provider.getDomain,
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"getProtocol": provider.getProtocol,
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"getPassHostHeader": provider.getPassHostHeader,
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"getPriority": provider.getPriority,
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"getEntryPoints": provider.getEntryPoints,
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"getFrontendRule": provider.getFrontendRule,
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"hasCircuitBreakerLabel": provider.hasCircuitBreakerLabel,
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"getCircuitBreakerExpression": provider.getCircuitBreakerExpression,
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"hasLoadBalancerLabel": provider.hasLoadBalancerLabel,
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"getLoadBalancerMethod": provider.getLoadBalancerMethod,
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"hasMaxConnLabels": provider.hasMaxConnLabels,
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"getMaxConnAmount": provider.getMaxConnAmount,
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"getMaxConnExtractorFunc": provider.getMaxConnExtractorFunc,
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"getSticky": provider.getSticky,
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"replace": replace,
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}
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// filter containers
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filteredContainers := fun.Filter(func(container dockerData) bool {
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return provider.containerFilter(container)
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}, containersInspected).([]dockerData)
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frontends := map[string][]dockerData{}
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backends := map[string]dockerData{}
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servers := map[string][]dockerData{}
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for _, container := range filteredContainers {
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frontendName := provider.getFrontendName(container)
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frontends[frontendName] = append(frontends[frontendName], container)
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backendName := provider.getBackend(container)
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backends[backendName] = container
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servers[backendName] = append(servers[backendName], container)
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}
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templateObjects := struct {
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Containers []dockerData
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Frontends map[string][]dockerData
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Backends map[string]dockerData
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Servers map[string][]dockerData
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Domain string
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}{
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filteredContainers,
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frontends,
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backends,
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servers,
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provider.Domain,
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}
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configuration, err := provider.getConfiguration("templates/docker.tmpl", DockerFuncMap, templateObjects)
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if err != nil {
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log.Error(err)
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}
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return configuration
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}
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func (provider *Docker) hasCircuitBreakerLabel(container dockerData) bool {
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if _, err := getLabel(container, "traefik.backend.circuitbreaker.expression"); err != nil {
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return false
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}
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return true
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}
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func (provider *Docker) hasLoadBalancerLabel(container dockerData) bool {
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_, errMethod := getLabel(container, "traefik.backend.loadbalancer.method")
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_, errSticky := getLabel(container, "traefik.backend.loadbalancer.sticky")
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if errMethod != nil && errSticky != nil {
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return false
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}
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return true
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}
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func (provider *Docker) hasMaxConnLabels(container dockerData) bool {
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if _, err := getLabel(container, "traefik.backend.maxconn.amount"); err != nil {
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return false
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}
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if _, err := getLabel(container, "traefik.backend.maxconn.extractorfunc"); err != nil {
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return false
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}
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return true
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}
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func (provider *Docker) getCircuitBreakerExpression(container dockerData) string {
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if label, err := getLabel(container, "traefik.backend.circuitbreaker.expression"); err == nil {
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return label
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}
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return "NetworkErrorRatio() > 1"
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}
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func (provider *Docker) getLoadBalancerMethod(container dockerData) string {
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if label, err := getLabel(container, "traefik.backend.loadbalancer.method"); err == nil {
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return label
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}
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return "wrr"
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}
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func (provider *Docker) getMaxConnAmount(container dockerData) int64 {
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if label, err := getLabel(container, "traefik.backend.maxconn.amount"); err == nil {
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i, errConv := strconv.ParseInt(label, 10, 64)
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if errConv != nil {
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log.Errorf("Unable to parse traefik.backend.maxconn.amount %s", label)
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return math.MaxInt64
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}
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return i
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}
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return math.MaxInt64
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}
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func (provider *Docker) getMaxConnExtractorFunc(container dockerData) string {
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if label, err := getLabel(container, "traefik.backend.maxconn.extractorfunc"); err == nil {
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return label
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}
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return "request.host"
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}
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func (provider *Docker) containerFilter(container dockerData) bool {
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_, err := strconv.Atoi(container.Labels["traefik.port"])
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if len(container.NetworkSettings.Ports) == 0 && err != nil {
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log.Debugf("Filtering container without port and no traefik.port label %s", container.Name)
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return false
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}
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if len(container.NetworkSettings.Ports) > 1 && err != nil {
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log.Debugf("Filtering container with more than 1 port and no traefik.port label %s", container.Name)
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return false
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}
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if !isContainerEnabled(container, provider.ExposedByDefault) {
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log.Debugf("Filtering disabled container %s", container.Name)
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return false
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}
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constraintTags := strings.Split(container.Labels["traefik.tags"], ",")
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if ok, failingConstraint := provider.MatchConstraints(constraintTags); !ok {
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if failingConstraint != nil {
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log.Debugf("Container %v pruned by '%v' constraint", container.Name, failingConstraint.String())
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}
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return false
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}
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return true
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}
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func (provider *Docker) getFrontendName(container dockerData) string {
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// Replace '.' with '-' in quoted keys because of this issue https://github.com/BurntSushi/toml/issues/78
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return normalize(provider.getFrontendRule(container))
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}
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// GetFrontendRule returns the frontend rule for the specified container, using
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// it's label. It returns a default one (Host) if the label is not present.
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func (provider *Docker) getFrontendRule(container dockerData) string {
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if label, err := getLabel(container, "traefik.frontend.rule"); err == nil {
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return label
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}
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return "Host:" + provider.getSubDomain(container.Name) + "." + provider.Domain
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}
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func (provider *Docker) getBackend(container dockerData) string {
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if label, err := getLabel(container, "traefik.backend"); err == nil {
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return label
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}
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return normalize(container.Name)
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}
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func (provider *Docker) getIPAddress(container dockerData) string {
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if label, err := getLabel(container, "traefik.docker.network"); err == nil && label != "" {
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networkSettings := container.NetworkSettings
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if networkSettings.Networks != nil {
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network := networkSettings.Networks[label]
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if network != nil {
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return network.Addr
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}
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}
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}
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// If net==host, quick n' dirty, we return 127.0.0.1
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// This will work locally, but will fail with swarm.
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if "host" == container.NetworkSettings.NetworkMode {
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return "127.0.0.1"
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}
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if provider.UseBindPortIP {
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port := provider.getPort(container)
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for netport, portBindings := range container.NetworkSettings.Ports {
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if string(netport) == port+"/TCP" || string(netport) == port+"/UDP" {
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for _, p := range portBindings {
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return p.HostIP
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}
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}
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}
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}
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for _, network := range container.NetworkSettings.Networks {
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return network.Addr
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}
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return ""
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}
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func (provider *Docker) getPort(container dockerData) string {
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if label, err := getLabel(container, "traefik.port"); err == nil {
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return label
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}
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for key := range container.NetworkSettings.Ports {
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return key.Port()
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}
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return ""
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}
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func (provider *Docker) getWeight(container dockerData) string {
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if label, err := getLabel(container, "traefik.weight"); err == nil {
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return label
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}
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return "1"
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}
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func (provider *Docker) getSticky(container dockerData) string {
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if _, err := getLabel(container, "traefik.backend.loadbalancer.sticky"); err == nil {
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return "true"
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}
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return "false"
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}
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func (provider *Docker) getDomain(container dockerData) string {
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if label, err := getLabel(container, "traefik.domain"); err == nil {
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return label
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}
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return provider.Domain
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}
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func (provider *Docker) getProtocol(container dockerData) string {
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if label, err := getLabel(container, "traefik.protocol"); err == nil {
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return label
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}
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return "http"
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}
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func (provider *Docker) getPassHostHeader(container dockerData) string {
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if passHostHeader, err := getLabel(container, "traefik.frontend.passHostHeader"); err == nil {
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return passHostHeader
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}
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return "true"
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}
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func (provider *Docker) getPriority(container dockerData) string {
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if priority, err := getLabel(container, "traefik.frontend.priority"); err == nil {
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return priority
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}
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return "0"
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}
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func (provider *Docker) getEntryPoints(container dockerData) []string {
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if entryPoints, err := getLabel(container, "traefik.frontend.entryPoints"); err == nil {
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return strings.Split(entryPoints, ",")
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}
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return []string{}
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}
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func isContainerEnabled(container dockerData, exposedByDefault bool) bool {
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return exposedByDefault && container.Labels["traefik.enable"] != "false" || container.Labels["traefik.enable"] == "true"
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}
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func getLabel(container dockerData, label string) (string, error) {
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for key, value := range container.Labels {
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if key == label {
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return value, nil
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}
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}
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return "", errors.New("Label not found:" + label)
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}
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func getLabels(container dockerData, labels []string) (map[string]string, error) {
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var globalErr error
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foundLabels := map[string]string{}
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for _, label := range labels {
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foundLabel, err := getLabel(container, label)
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// Error out only if one of them is defined.
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if err != nil {
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globalErr = errors.New("Label not found: " + label)
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continue
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}
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foundLabels[label] = foundLabel
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}
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return foundLabels, globalErr
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}
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func listContainers(ctx context.Context, dockerClient client.ContainerAPIClient) ([]dockerData, error) {
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containerList, err := dockerClient.ContainerList(ctx, dockertypes.ContainerListOptions{})
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if err != nil {
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return []dockerData{}, err
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}
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containersInspected := []dockerData{}
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// get inspect containers
|
|
for _, container := range containerList {
|
|
containerInspected, err := dockerClient.ContainerInspect(ctx, container.ID)
|
|
if err != nil {
|
|
log.Warnf("Failed to inspect container %s, error: %s", container.ID, err)
|
|
} else {
|
|
dockerData := parseContainer(containerInspected)
|
|
containersInspected = append(containersInspected, dockerData)
|
|
}
|
|
}
|
|
return containersInspected, nil
|
|
}
|
|
|
|
func parseContainer(container dockertypes.ContainerJSON) dockerData {
|
|
dockerData := dockerData{
|
|
NetworkSettings: networkSettings{},
|
|
}
|
|
|
|
if container.ContainerJSONBase != nil {
|
|
dockerData.Name = container.ContainerJSONBase.Name
|
|
|
|
if container.ContainerJSONBase.HostConfig != nil {
|
|
dockerData.NetworkSettings.NetworkMode = container.ContainerJSONBase.HostConfig.NetworkMode
|
|
}
|
|
}
|
|
|
|
if container.Config != nil && container.Config.Labels != nil {
|
|
dockerData.Labels = container.Config.Labels
|
|
}
|
|
|
|
if container.NetworkSettings != nil {
|
|
if container.NetworkSettings.Ports != nil {
|
|
dockerData.NetworkSettings.Ports = container.NetworkSettings.Ports
|
|
}
|
|
if container.NetworkSettings.Networks != nil {
|
|
dockerData.NetworkSettings.Networks = make(map[string]*networkData)
|
|
for name, containerNetwork := range container.NetworkSettings.Networks {
|
|
dockerData.NetworkSettings.Networks[name] = &networkData{
|
|
ID: containerNetwork.NetworkID,
|
|
Name: name,
|
|
Addr: containerNetwork.IPAddress,
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
return dockerData
|
|
}
|
|
|
|
// Escape beginning slash "/", convert all others to dash "-"
|
|
func (provider *Docker) getSubDomain(name string) string {
|
|
return strings.Replace(strings.TrimPrefix(name, "/"), "/", "-", -1)
|
|
}
|
|
|
|
func listServices(ctx context.Context, dockerClient client.APIClient) ([]dockerData, error) {
|
|
serviceList, err := dockerClient.ServiceList(ctx, dockertypes.ServiceListOptions{})
|
|
if err != nil {
|
|
return []dockerData{}, err
|
|
}
|
|
networkListArgs := filters.NewArgs()
|
|
networkListArgs.Add("driver", "overlay")
|
|
|
|
networkList, err := dockerClient.NetworkList(ctx, dockertypes.NetworkListOptions{Filters: networkListArgs})
|
|
|
|
networkMap := make(map[string]*dockertypes.NetworkResource)
|
|
if err != nil {
|
|
log.Debug("Failed to network inspect on client for docker, error: %s", err)
|
|
return []dockerData{}, err
|
|
}
|
|
for _, network := range networkList {
|
|
networkMap[network.ID] = &network
|
|
}
|
|
|
|
var dockerDataList []dockerData
|
|
|
|
for _, service := range serviceList {
|
|
dockerData := parseService(service, networkMap)
|
|
|
|
dockerDataList = append(dockerDataList, dockerData)
|
|
}
|
|
return dockerDataList, err
|
|
|
|
}
|
|
|
|
func parseService(service swarmtypes.Service, networkMap map[string]*dockertypes.NetworkResource) dockerData {
|
|
dockerData := dockerData{
|
|
Name: service.Spec.Annotations.Name,
|
|
Labels: service.Spec.Annotations.Labels,
|
|
NetworkSettings: networkSettings{},
|
|
}
|
|
|
|
if service.Spec.EndpointSpec != nil {
|
|
switch service.Spec.EndpointSpec.Mode {
|
|
case swarm.ResolutionModeDNSRR:
|
|
log.Debug("Ignored endpoint-mode not supported, service name: %s", dockerData.Name)
|
|
case swarm.ResolutionModeVIP:
|
|
dockerData.NetworkSettings.Networks = make(map[string]*networkData)
|
|
for _, virtualIP := range service.Endpoint.VirtualIPs {
|
|
networkService := networkMap[virtualIP.NetworkID]
|
|
if networkService != nil {
|
|
ip, _, _ := net.ParseCIDR(virtualIP.Addr)
|
|
network := &networkData{
|
|
Name: networkService.Name,
|
|
ID: virtualIP.NetworkID,
|
|
Addr: ip.String(),
|
|
}
|
|
dockerData.NetworkSettings.Networks[network.Name] = network
|
|
} else {
|
|
log.Debug("Network not found, id: %s", virtualIP.NetworkID)
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
return dockerData
|
|
}
|