Refactor traefik with package
Split a bit traefik into package. The idea behind this refactor is to start move inter-dependencies away and do some DRY or SRP. - Adds a `provider` package, with providers except `web.go` - Adds a `types` package with common struct. - Move `gen.go` to an `autogen` package Signed-off-by: Vincent Demeester <vincent@sbr.pm>
This commit is contained in:
Vincent Demeester
parent
6e1a0554c0
commit
de0a57ec76
21 changed files with 195 additions and 167 deletions
247
provider/docker.go
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247
provider/docker.go
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@ -0,0 +1,247 @@
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package provider
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import (
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"bytes"
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"errors"
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"fmt"
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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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"github.com/BurntSushi/toml"
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"github.com/BurntSushi/ty/fun"
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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/autogen"
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"github.com/emilevauge/traefik/types"
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"github.com/fsouza/go-dockerclient"
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)
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type DockerProvider struct {
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Watch bool
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Endpoint string
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Filename string
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Domain string
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}
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func (provider *DockerProvider) Provide(configurationChan chan<- types.ConfigMessage) error {
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if dockerClient, err := docker.NewClient(provider.Endpoint); 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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} else {
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err := dockerClient.Ping()
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if err != nil {
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log.Errorf("Docker connection error %+v", err)
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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)
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log.Debug("Docker listening")
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go func() {
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operation := func() error {
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for {
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event := <-dockerEvents
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if event == nil {
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return errors.New("Docker event nil")
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// log.Fatalf("Docker connection error")
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}
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if event.Status == "start" || event.Status == "die" {
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log.Debugf("Docker event receveived %+v", event)
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configuration := provider.loadDockerConfig(dockerClient)
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if configuration != nil {
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configurationChan <- types.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) {
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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, backoff.NewExponentialBackOff(), notify)
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if err != nil {
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log.Fatalf("Cannot connect to docker server %+v", err)
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}
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}()
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}
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configuration := provider.loadDockerConfig(dockerClient)
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configurationChan <- types.ConfigMessage{"docker", configuration}
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}
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return nil
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}
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func (provider *DockerProvider) loadDockerConfig(dockerClient *docker.Client) *types.Configuration {
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var DockerFuncMap = template.FuncMap{
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"getBackend": func(container docker.Container) string {
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if label, err := provider.getLabel(container, "traefik.backend"); err == nil {
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return label
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}
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return provider.getEscapedName(container.Name)
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},
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"getPort": func(container docker.Container) string {
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if label, err := provider.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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"getWeight": func(container docker.Container) string {
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if label, err := provider.getLabel(container, "traefik.weight"); err == nil {
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return label
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}
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return "0"
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},
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"getDomain": func(container docker.Container) string {
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if label, err := provider.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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"getProtocol": func(container docker.Container) string {
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if label, err := provider.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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"getPassHostHeader": func(container docker.Container) string {
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if passHostHeader, err := provider.getLabel(container, "traefik.frontend.passHostHeader"); err == nil {
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return passHostHeader
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}
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return "false"
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},
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"getFrontendValue": provider.GetFrontendValue,
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"getFrontendRule": provider.GetFrontendRule,
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"replace": func(s1 string, s2 string, s3 string) string {
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return strings.Replace(s3, s1, s2, -1)
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},
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}
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configuration := new(types.Configuration)
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containerList, _ := dockerClient.ListContainers(docker.ListContainersOptions{})
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containersInspected := []docker.Container{}
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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)
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}
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// filter containers
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filteredContainers := fun.Filter(func(container docker.Container) bool {
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if len(container.NetworkSettings.Ports) == 0 {
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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 {
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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 container.Config.Labels["traefik.enable"] == "false" {
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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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if _, err := provider.getLabels(container, []string{"traefik.frontend.rule", "traefik.frontend.value"}); err != nil {
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log.Debugf("Filtering bad labeled container %s", container.Name)
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return false
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}
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return true
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}, containersInspected).([]docker.Container)
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for _, container := range filteredContainers {
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frontends[provider.getFrontendName(container)] = append(frontends[provider.getFrontendName(container)], container)
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}
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templateObjects := struct {
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Containers []docker.Container
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Frontends map[string][]docker.Container
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Domain string
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}{
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filteredContainers,
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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)
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if err != nil {
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log.Error("Error reading file", err)
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return nil
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}
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} else {
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buf, err := autogen.Asset("templates/docker.tmpl")
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if err != nil {
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log.Error("Error reading file", err)
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}
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_, err = tmpl.Parse(string(buf))
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if err != nil {
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log.Error("Error reading file", err)
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return nil
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}
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}
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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)
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return nil
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}
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if _, err := toml.Decode(buffer.String(), configuration); err != nil {
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log.Error("Error creating docker configuration ", err)
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return nil
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}
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return configuration
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}
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func (provider *DockerProvider) getFrontendName(container docker.Container) 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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frontendName := fmt.Sprintf("%s-%s", provider.GetFrontendRule(container), provider.GetFrontendValue(container))
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return strings.Replace(frontendName, ".", "-", -1)
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}
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func (provider *DockerProvider) getEscapedName(name string) string {
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return strings.Replace(name, "/", "", -1)
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}
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func (provider *DockerProvider) getLabel(container docker.Container, label string) (string, error) {
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for key, value := range container.Config.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 (provider *DockerProvider) getLabels(container docker.Container, labels []string) (map[string]string, error) {
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foundLabels := map[string]string{}
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for _, label := range labels {
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if foundLabel, err := provider.getLabel(container, label); err != nil {
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return nil, errors.New("Label not found: " + label)
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} else {
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foundLabels[label] = foundLabel
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}
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}
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return foundLabels, nil
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}
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func (provider *DockerProvider) GetFrontendValue(container docker.Container) string {
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if label, err := provider.getLabel(container, "traefik.frontend.value"); err == nil {
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return label
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}
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return provider.getEscapedName(container.Name) + "." + provider.Domain
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}
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func (provider *DockerProvider) GetFrontendRule(container docker.Container) string {
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if label, err := provider.getLabel(container, "traefik.frontend.rule"); err == nil {
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return label
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}
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return "Host"
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}
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