traefik/docker.go

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package main
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import (
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"github.com/fsouza/go-dockerclient"
"github.com/leekchan/gtf"
"bytes"
"github.com/BurntSushi/toml"
"log"
"text/template"
"strings"
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)
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type DockerProvider struct {
Watch bool
Endpoint string
dockerClient *docker.Client
Filename string
Domain string
}
var DockerFuncMap = template.FuncMap{
"getBackend": func(container docker.Container) string {
for key, value := range container.Config.Labels {
if (key == "træfik.backend") {
return value
}
}
return container.Config.Hostname
},
"getPort": func(container docker.Container) string {
for key, value := range container.Config.Labels {
if (key == "træfik.port") {
return value
}
}
for key, _ := range container.NetworkSettings.Ports {
return key.Port()
}
return ""
},
"getHost": getHost,
}
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func (provider *DockerProvider) Provide(configurationChan chan <- *Configuration) {
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if client, err := docker.NewClient(provider.Endpoint); err != nil {
log.Fatalf("Failed to create a client for docker, error: %s", err)
} else {
provider.dockerClient = client
dockerEvents := make(chan *docker.APIEvents)
if (provider.Watch) {
provider.dockerClient.AddEventListener(dockerEvents)
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}
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go func() {
for {
event := <-dockerEvents
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log.Println("Docker event receveived", event)
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configuration := provider.loadDockerConfig()
if (configuration != nil) {
configurationChan <- configuration
}
}
}()
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configuration := provider.loadDockerConfig()
configurationChan <- configuration
}
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}
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func (provider *DockerProvider) loadDockerConfig() *Configuration {
configuration := new(Configuration)
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containerList, _ := provider.dockerClient.ListContainers(docker.ListContainersOptions{})
containersInspected := []docker.Container{}
hosts := map[string][]docker.Container{}
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for _, container := range containerList {
containerInspected, _ := provider.dockerClient.InspectContainer(container.ID)
containersInspected = append(containersInspected, *containerInspected)
hosts[getHost(*containerInspected)] = append(hosts[getHost(*containerInspected)], *containerInspected)
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}
templateObjects := struct {
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Containers []docker.Container
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Hosts map[string][]docker.Container
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Domain string
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}{
containersInspected,
hosts,
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provider.Domain,
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}
gtf.Inject(DockerFuncMap)
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tmpl, err := template.New(provider.Filename).Funcs(DockerFuncMap).ParseFiles(provider.Filename)
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if err != nil {
log.Println("Error reading file:", err)
return nil
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}
var buffer bytes.Buffer
err = tmpl.Execute(&buffer, templateObjects)
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if err != nil {
log.Println("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.Println("Error creating docker configuration:", err)
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return nil
}
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return configuration
}
func getHost(container docker.Container) string {
for key, value := range container.Config.Labels {
if (key == "træfik.host") {
return value
}
}
return strings.TrimPrefix(container.Name, "/")
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}