traefik/provider/rancher.go
2017-03-06 17:45:58 +01:00

474 lines
13 KiB
Go

package provider
import (
"context"
"errors"
"fmt"
"math"
"os"
"strconv"
"strings"
"text/template"
"time"
"github.com/BurntSushi/ty/fun"
"github.com/cenk/backoff"
"github.com/containous/traefik/job"
"github.com/containous/traefik/log"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
rancher "github.com/rancher/go-rancher/client"
)
const (
// RancherDefaultWatchTime is the duration of the interval when polling rancher
RancherDefaultWatchTime = 15 * time.Second
)
var _ Provider = (*Rancher)(nil)
// Rancher holds configurations of the Rancher provider.
type Rancher struct {
BaseProvider `mapstructure:",squash"`
Endpoint string `description:"Rancher server HTTP(S) endpoint."`
AccessKey string `description:"Rancher server access key."`
SecretKey string `description:"Rancher server Secret Key."`
ExposedByDefault bool `description:"Expose Services by default"`
Domain string `description:"Default domain used"`
}
type rancherData struct {
Name string
Labels map[string]string // List of labels set to container or service
Containers []string
Health string
}
func (r rancherData) String() string {
return fmt.Sprintf("{name:%s, labels:%v, containers: %v, health: %s}", r.Name, r.Labels, r.Containers, r.Health)
}
// Frontend Labels
func (provider *Rancher) getPassHostHeader(service rancherData) string {
if passHostHeader, err := getServiceLabel(service, "traefik.frontend.passHostHeader"); err == nil {
return passHostHeader
}
return "true"
}
func (provider *Rancher) getPriority(service rancherData) string {
if priority, err := getServiceLabel(service, "traefik.frontend.priority"); err == nil {
return priority
}
return "0"
}
func (provider *Rancher) getEntryPoints(service rancherData) []string {
if entryPoints, err := getServiceLabel(service, "traefik.frontend.entryPoints"); err == nil {
return strings.Split(entryPoints, ",")
}
return []string{}
}
func (provider *Rancher) getFrontendRule(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.frontend.rule"); err == nil {
return label
}
return "Host:" + strings.ToLower(strings.Replace(service.Name, "/", ".", -1)) + "." + provider.Domain
}
func (provider *Rancher) getFrontendName(service rancherData) string {
// Replace '.' with '-' in quoted keys because of this issue https://github.com/BurntSushi/toml/issues/78
return normalize(provider.getFrontendRule(service))
}
// Backend Labels
func (provider *Rancher) getLoadBalancerMethod(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.backend.loadbalancer.method"); err == nil {
return label
}
return "wrr"
}
func (provider *Rancher) hasLoadBalancerLabel(service rancherData) bool {
_, errMethod := getServiceLabel(service, "traefik.backend.loadbalancer.method")
_, errSticky := getServiceLabel(service, "traefik.backend.loadbalancer.sticky")
if errMethod != nil && errSticky != nil {
return false
}
return true
}
func (provider *Rancher) hasCircuitBreakerLabel(service rancherData) bool {
if _, err := getServiceLabel(service, "traefik.backend.circuitbreaker.expression"); err != nil {
return false
}
return true
}
func (provider *Rancher) getCircuitBreakerExpression(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.backend.circuitbreaker.expression"); err == nil {
return label
}
return "NetworkErrorRatio() > 1"
}
func (provider *Rancher) getSticky(service rancherData) string {
if _, err := getServiceLabel(service, "traefik.backend.loadbalancer.sticky"); err == nil {
return "true"
}
return "false"
}
func (provider *Rancher) getBackend(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.backend"); err == nil {
return normalize(label)
}
return normalize(service.Name)
}
// Generall Application Stuff
func (provider *Rancher) getPort(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.port"); err == nil {
return label
}
return ""
}
func (provider *Rancher) getProtocol(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.protocol"); err == nil {
return label
}
return "http"
}
func (provider *Rancher) getWeight(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.weight"); err == nil {
return label
}
return "0"
}
func (provider *Rancher) getDomain(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.domain"); err == nil {
return label
}
return provider.Domain
}
func (provider *Rancher) hasMaxConnLabels(service rancherData) bool {
if _, err := getServiceLabel(service, "traefik.backend.maxconn.amount"); err != nil {
return false
}
if _, err := getServiceLabel(service, "traefik.backend.maxconn.extractorfunc"); err != nil {
return false
}
return true
}
func (provider *Rancher) getMaxConnAmount(service rancherData) int64 {
if label, err := getServiceLabel(service, "traefik.backend.maxconn.amount"); err == nil {
i, errConv := strconv.ParseInt(label, 10, 64)
if errConv != nil {
log.Errorf("Unable to parse traefik.backend.maxconn.amount %s", label)
return math.MaxInt64
}
return i
}
return math.MaxInt64
}
func (provider *Rancher) getMaxConnExtractorFunc(service rancherData) string {
if label, err := getServiceLabel(service, "traefik.backend.maxconn.extractorfunc"); err == nil {
return label
}
return "request.host"
}
func getServiceLabel(service rancherData, label string) (string, error) {
for key, value := range service.Labels {
if key == label {
return value, nil
}
}
return "", errors.New("Label not found:" + label)
}
func (provider *Rancher) createClient() (*rancher.RancherClient, error) {
rancherURL := getenv("CATTLE_URL", provider.Endpoint)
accessKey := getenv("CATTLE_ACCESS_KEY", provider.AccessKey)
secretKey := getenv("CATTLE_SECRET_KEY", provider.SecretKey)
return rancher.NewRancherClient(&rancher.ClientOpts{
Url: rancherURL,
AccessKey: accessKey,
SecretKey: secretKey,
})
}
func getenv(key, fallback string) string {
value := os.Getenv(key)
if len(value) == 0 {
return fallback
}
return value
}
// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (provider *Rancher) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
safe.Go(func() {
operation := func() error {
rancherClient, err := provider.createClient()
if err != nil {
log.Errorf("Failed to create a client for rancher, error: %s", err)
return err
}
ctx := context.Background()
var environments = listRancherEnvironments(rancherClient)
var services = listRancherServices(rancherClient)
var container = listRancherContainer(rancherClient)
var rancherData = parseRancherData(environments, services, container)
configuration := provider.loadRancherConfig(rancherData)
configurationChan <- types.ConfigMessage{
ProviderName: "rancher",
Configuration: configuration,
}
if provider.Watch {
_, cancel := context.WithCancel(ctx)
ticker := time.NewTicker(RancherDefaultWatchTime)
pool.Go(func(stop chan bool) {
for {
select {
case <-ticker.C:
log.Debugf("Refreshing new Data from Rancher API")
var environments = listRancherEnvironments(rancherClient)
var services = listRancherServices(rancherClient)
var container = listRancherContainer(rancherClient)
rancherData := parseRancherData(environments, services, container)
configuration := provider.loadRancherConfig(rancherData)
if configuration != nil {
configurationChan <- types.ConfigMessage{
ProviderName: "rancher",
Configuration: configuration,
}
}
case <-stop:
ticker.Stop()
cancel()
return
}
}
})
}
return nil
}
notify := func(err error, time time.Duration) {
log.Errorf("Rancher connection error %+v, retrying in %s", err, time)
}
err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
if err != nil {
log.Errorf("Cannot connect to Rancher Endpoint %+v", err)
}
})
return nil
}
func listRancherEnvironments(client *rancher.RancherClient) []*rancher.Environment {
var environmentList = []*rancher.Environment{}
environments, err := client.Environment.List(nil)
if err != nil {
log.Errorf("Cannot get Rancher Environments %+v", err)
}
for k := range environments.Data {
environmentList = append(environmentList, &environments.Data[k])
}
return environmentList
}
func listRancherServices(client *rancher.RancherClient) []*rancher.Service {
var servicesList = []*rancher.Service{}
services, err := client.Service.List(nil)
if err != nil {
log.Errorf("Cannot get Rancher Services %+v", err)
}
for k := range services.Data {
servicesList = append(servicesList, &services.Data[k])
}
return servicesList
}
func listRancherContainer(client *rancher.RancherClient) []*rancher.Container {
containerList := []*rancher.Container{}
container, err := client.Container.List(nil)
log.Debugf("first container len: %i", len(container.Data))
if err != nil {
log.Errorf("Cannot get Rancher Services %+v", err)
}
valid := true
for valid {
for k := range container.Data {
containerList = append(containerList, &container.Data[k])
}
container, err = container.Next()
if err != nil {
break
}
if container == nil || len(container.Data) == 0 {
valid = false
}
}
return containerList
}
func parseRancherData(environments []*rancher.Environment, services []*rancher.Service, containers []*rancher.Container) []rancherData {
var rancherDataList []rancherData
for _, environment := range environments {
for _, service := range services {
if service.EnvironmentId != environment.Id {
continue
}
rancherData := rancherData{
Name: environment.Name + "/" + service.Name,
Health: service.HealthState,
Labels: make(map[string]string),
Containers: []string{},
}
for key, value := range service.LaunchConfig.Labels {
rancherData.Labels[key] = value.(string)
}
for _, container := range containers {
for key, value := range container.Labels {
if key == "io.rancher.stack_service.name" && value == rancherData.Name {
rancherData.Containers = append(rancherData.Containers, container.PrimaryIpAddress)
}
}
}
rancherDataList = append(rancherDataList, rancherData)
}
}
return rancherDataList
}
func (provider *Rancher) loadRancherConfig(services []rancherData) *types.Configuration {
var RancherFuncMap = template.FuncMap{
"getPort": provider.getPort,
"getBackend": provider.getBackend,
"getWeight": provider.getWeight,
"getDomain": provider.getDomain,
"getProtocol": provider.getProtocol,
"getPassHostHeader": provider.getPassHostHeader,
"getPriority": provider.getPriority,
"getEntryPoints": provider.getEntryPoints,
"getFrontendRule": provider.getFrontendRule,
"hasCircuitBreakerLabel": provider.hasCircuitBreakerLabel,
"getCircuitBreakerExpression": provider.getCircuitBreakerExpression,
"hasLoadBalancerLabel": provider.hasLoadBalancerLabel,
"getLoadBalancerMethod": provider.getLoadBalancerMethod,
"hasMaxConnLabels": provider.hasMaxConnLabels,
"getMaxConnAmount": provider.getMaxConnAmount,
"getMaxConnExtractorFunc": provider.getMaxConnExtractorFunc,
"getSticky": provider.getSticky,
}
// filter services
filteredServices := fun.Filter(func(service rancherData) bool {
return provider.serviceFilter(service)
}, services).([]rancherData)
frontends := map[string]rancherData{}
backends := map[string]rancherData{}
for _, service := range filteredServices {
frontendName := provider.getFrontendName(service)
frontends[frontendName] = service
backendName := provider.getBackend(service)
backends[backendName] = service
}
templateObjects := struct {
Frontends map[string]rancherData
Backends map[string]rancherData
Domain string
}{
frontends,
backends,
provider.Domain,
}
configuration, err := provider.getConfiguration("templates/rancher.tmpl", RancherFuncMap, templateObjects)
if err != nil {
log.Error(err)
}
return configuration
}
func (provider *Rancher) serviceFilter(service rancherData) bool {
if service.Labels["traefik.port"] == "" {
log.Debugf("Filtering service %s without traefik.port label", service.Name)
return false
}
if !isServiceEnabled(service, provider.ExposedByDefault) {
log.Debugf("Filtering disabled service %s", service.Name)
return false
}
if service.Health != "" && service.Health != "healthy" {
log.Debugf("Filtering unhealthy or starting service %s", service.Name)
return false
}
return true
}
func isServiceEnabled(service rancherData, exposedByDefault bool) bool {
if service.Labels["traefik.enable"] != "" {
var v = service.Labels["traefik.enable"]
return exposedByDefault && v != "false" || v == "true"
}
return exposedByDefault
}