traefik/provider/docker.go

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package provider
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import (
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"bytes"
"errors"
"fmt"
"strconv"
"strings"
"text/template"
"time"
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"github.com/BurntSushi/toml"
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"github.com/BurntSushi/ty/fun"
log "github.com/Sirupsen/logrus"
"github.com/cenkalti/backoff"
"github.com/emilevauge/traefik/autogen"
"github.com/emilevauge/traefik/types"
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"github.com/fsouza/go-dockerclient"
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)
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// Docker holds configurations of the Docker provider.
type Docker struct {
Watch bool
Endpoint string
Filename string
Domain string
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}
// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (provider *Docker) Provide(configurationChan chan<- types.ConfigMessage) error {
dockerClient, err := docker.NewClient(provider.Endpoint)
if err != nil {
log.Errorf("Failed to create a client for docker, error: %s", err)
return err
}
err = dockerClient.Ping()
if err != nil {
log.Errorf("Docker connection error %+v", err)
return err
}
log.Debug("Docker connection established")
if provider.Watch {
dockerEvents := make(chan *docker.APIEvents)
dockerClient.AddEventListener(dockerEvents)
log.Debug("Docker listening")
go func() {
operation := func() error {
for {
event := <-dockerEvents
if event == nil {
return errors.New("Docker event nil")
// log.Fatalf("Docker connection error")
}
if event.Status == "start" || event.Status == "die" {
log.Debugf("Docker event receveived %+v", event)
configuration := provider.loadDockerConfig(dockerClient)
if configuration != nil {
configurationChan <- types.ConfigMessage{"docker", configuration}
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}
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}
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}
}
notify := func(err error, time time.Duration) {
log.Errorf("Docker connection error %+v, retrying in %s", err, time)
}
err := backoff.RetryNotify(operation, backoff.NewExponentialBackOff(), notify)
if err != nil {
log.Fatalf("Cannot connect to docker server %+v", err)
}
}()
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}
configuration := provider.loadDockerConfig(dockerClient)
configurationChan <- types.ConfigMessage{"docker", configuration}
return nil
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}
func (provider *Docker) loadDockerConfig(dockerClient *docker.Client) *types.Configuration {
var DockerFuncMap = template.FuncMap{
"getBackend": func(container docker.Container) string {
if label, err := provider.getLabel(container, "traefik.backend"); err == nil {
return label
}
return provider.getEscapedName(container.Name)
},
"getPort": func(container docker.Container) string {
if label, err := provider.getLabel(container, "traefik.port"); err == nil {
return label
}
for key := range container.NetworkSettings.Ports {
return key.Port()
}
return ""
},
"getWeight": func(container docker.Container) string {
if label, err := provider.getLabel(container, "traefik.weight"); err == nil {
return label
}
return "0"
},
"getDomain": func(container docker.Container) string {
if label, err := provider.getLabel(container, "traefik.domain"); err == nil {
return label
}
return provider.Domain
},
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"getProtocol": func(container docker.Container) string {
if label, err := provider.getLabel(container, "traefik.protocol"); err == nil {
return label
}
return "http"
},
"getPassHostHeader": func(container docker.Container) string {
if passHostHeader, err := provider.getLabel(container, "traefik.frontend.passHostHeader"); err == nil {
return passHostHeader
}
return "false"
},
"getFrontendValue": provider.GetFrontendValue,
"getFrontendRule": provider.GetFrontendRule,
"replace": func(s1 string, s2 string, s3 string) string {
return strings.Replace(s3, s1, s2, -1)
},
}
configuration := new(types.Configuration)
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containerList, _ := dockerClient.ListContainers(docker.ListContainersOptions{})
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containersInspected := []docker.Container{}
frontends := map[string][]docker.Container{}
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// get inspect containers
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for _, container := range containerList {
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containerInspected, _ := dockerClient.InspectContainer(container.ID)
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containersInspected = append(containersInspected, *containerInspected)
}
// filter containers
filteredContainers := fun.Filter(func(container docker.Container) bool {
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if len(container.NetworkSettings.Ports) == 0 {
log.Debugf("Filtering container without port %s", container.Name)
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return false
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}
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_, err := strconv.Atoi(container.Config.Labels["traefik.port"])
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if len(container.NetworkSettings.Ports) > 1 && err != nil {
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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if container.Config.Labels["traefik.enable"] == "false" {
log.Debugf("Filtering disabled container %s", container.Name)
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return false
}
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if _, err := provider.getLabels(container, []string{"traefik.frontend.rule", "traefik.frontend.value"}); err != nil {
log.Debugf("Filtering bad labeled container %s", container.Name)
return false
}
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return true
}, containersInspected).([]docker.Container)
for _, container := range filteredContainers {
frontends[provider.getFrontendName(container)] = append(frontends[provider.getFrontendName(container)], container)
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}
templateObjects := struct {
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Containers []docker.Container
Frontends map[string][]docker.Container
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Domain string
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}{
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filteredContainers,
frontends,
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provider.Domain,
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}
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tmpl := template.New(provider.Filename).Funcs(DockerFuncMap)
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if len(provider.Filename) > 0 {
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_, err := tmpl.ParseFiles(provider.Filename)
if err != nil {
log.Error("Error reading file", err)
return nil
}
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} else {
buf, err := autogen.Asset("templates/docker.tmpl")
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if err != nil {
log.Error("Error reading file", err)
}
_, err = tmpl.Parse(string(buf))
if err != nil {
log.Error("Error reading file", err)
return nil
}
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}
var buffer bytes.Buffer
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err := tmpl.Execute(&buffer, templateObjects)
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if err != nil {
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log.Error("Error with docker template", err)
return nil
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}
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if _, err := toml.Decode(buffer.String(), configuration); err != nil {
log.Error("Error creating docker configuration ", err)
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return nil
}
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return configuration
}
func (provider *Docker) getFrontendName(container docker.Container) string {
// Replace '.' with '-' in quoted keys because of this issue https://github.com/BurntSushi/toml/issues/78
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frontendName := fmt.Sprintf("%s-%s", provider.GetFrontendRule(container), provider.GetFrontendValue(container))
return strings.Replace(frontendName, ".", "-", -1)
}
func (provider *Docker) getEscapedName(name string) string {
return strings.Replace(name, "/", "", -1)
}
func (provider *Docker) getLabel(container docker.Container, label string) (string, error) {
for key, value := range container.Config.Labels {
if key == label {
return value, nil
}
}
return "", errors.New("Label not found:" + label)
}
func (provider *Docker) getLabels(container docker.Container, labels []string) (map[string]string, error) {
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foundLabels := map[string]string{}
for _, label := range labels {
foundLabel, err := provider.getLabel(container, label)
if err != nil {
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return nil, errors.New("Label not found: " + label)
}
foundLabels[label] = foundLabel
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}
return foundLabels, nil
}
// GetFrontendValue returns the frontend value for the specified container, using
// it's label. It returns a default one if the label is not present.
func (provider *Docker) GetFrontendValue(container docker.Container) string {
if label, err := provider.getLabel(container, "traefik.frontend.value"); err == nil {
return label
}
return provider.getEscapedName(container.Name) + "." + provider.Domain
}
// GetFrontendRule returns the frontend rule for the specified container, using
// it's label. It returns a default one (Host) if the label is not present.
func (provider *Docker) GetFrontendRule(container docker.Container) string {
if label, err := provider.getLabel(container, "traefik.frontend.rule"); err == nil {
return label
}
return "Host"
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}