traefik/docker.go

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package main
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import (
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"bytes"
"errors"
"strconv"
"strings"
"text/template"
"time"
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"fmt"
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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"
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"github.com/fsouza/go-dockerclient"
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)
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type DockerProvider struct {
Watch bool
Endpoint string
Filename string
Domain string
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}
func (provider *DockerProvider) Provide(configurationChan chan<- configMessage) error {
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if dockerClient, err := docker.NewClient(provider.Endpoint); err != nil {
log.Errorf("Failed to create a client for docker, error: %s", err)
return err
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} else {
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err := dockerClient.Ping()
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if err != nil {
log.Errorf("Docker connection error %+v", err)
return err
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}
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log.Debug("Docker connection established")
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if provider.Watch {
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dockerEvents := make(chan *docker.APIEvents)
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dockerClient.AddEventListener(dockerEvents)
log.Debug("Docker listening")
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go func() {
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operation := func() error {
for {
event := <-dockerEvents
if event == nil {
return errors.New("Docker event nil")
// log.Fatalf("Docker connection error")
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}
if event.Status == "start" || event.Status == "die" {
log.Debugf("Docker event receveived %+v", event)
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configuration := provider.loadDockerConfig(dockerClient)
if configuration != nil {
configurationChan <- configMessage{"docker", configuration}
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}
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}
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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)
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}
err := backoff.RetryNotify(operation, backoff.NewExponentialBackOff(), notify)
if err != nil {
log.Fatalf("Cannot connect to docker server %+v", err)
}
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}()
}
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configuration := provider.loadDockerConfig(dockerClient)
configurationChan <- configMessage{"docker", configuration}
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}
return nil
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}
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func (provider *DockerProvider) loadDockerConfig(dockerClient *docker.Client) *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"
},
"getFrontendValue": provider.GetFrontendValue,
"getFrontendRule": provider.GetFrontendRule,
"replace": func(s1 string, s2 string, s3 string) string {
return strings.Replace(s3, s1, s2, -1)
},
}
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configuration := new(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 := 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 *DockerProvider) 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 *DockerProvider) getEscapedName(name string) string {
return strings.Replace(name, "/", "", -1)
}
func (provider *DockerProvider) 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)
}
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func (provider *DockerProvider) getLabels(container docker.Container, labels []string) (map[string]string, error) {
foundLabels := map[string]string{}
for _, label := range labels {
if foundLabel, err := provider.getLabel(container, label); err != nil {
return nil, errors.New("Label not found: " + label)
} else {
foundLabels[label] = foundLabel
}
}
return foundLabels, nil
}
func (provider *DockerProvider) 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
}
func (provider *DockerProvider) GetFrontendRule(container docker.Container) string {
if label, err := provider.getLabel(container, "traefik.frontend.rule"); err == nil {
return label
}
return "Host"
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}