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api.go
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api.go
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package rancher
import (
"context"
"os"
"time"
"github.com/cenk/backoff"
"github.com/containous/traefik/job"
"github.com/containous/traefik/log"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"github.com/mitchellh/mapstructure"
rancher "github.com/rancher/go-rancher/v2"
)
const (
labelRancherStackServiceName = "io.rancher.stack_service.name"
hostNetwork = "host"
)
var withoutPagination *rancher.ListOpts
// APIConfiguration contains configuration properties specific to the Rancher
// API provider.
type APIConfiguration struct {
Endpoint string `description:"Rancher server API HTTP(S) endpoint"`
AccessKey string `description:"Rancher server API access key"`
SecretKey string `description:"Rancher server API secret key"`
}
func init() {
withoutPagination = &rancher.ListOpts{
Filters: map[string]interface{}{"limit": 0},
}
}
func (p *Provider) createClient() (*rancher.RancherClient, error) {
rancherURL := getenv("CATTLE_URL", p.API.Endpoint)
accessKey := getenv("CATTLE_ACCESS_KEY", p.API.AccessKey)
secretKey := getenv("CATTLE_SECRET_KEY", p.API.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
}
func (p *Provider) apiProvide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool) error {
if p.API == nil {
p.API = &APIConfiguration{}
}
safe.Go(func() {
operation := func() error {
rancherClient, err := p.createClient()
if err != nil {
log.Errorf("Failed to create a client for rancher, error: %s", err)
return err
}
ctx := context.Background()
var stacks = listRancherStacks(rancherClient)
var services = listRancherServices(rancherClient)
var container = listRancherContainer(rancherClient)
var rancherData = parseAPISourcedRancherData(stacks, services, container)
configuration := p.buildConfiguration(rancherData)
configurationChan <- types.ConfigMessage{
ProviderName: "rancher",
Configuration: configuration,
}
if p.Watch {
_, cancel := context.WithCancel(ctx)
ticker := time.NewTicker(time.Second * time.Duration(p.RefreshSeconds))
pool.Go(func(stop chan bool) {
for {
select {
case <-ticker.C:
checkAPI, errAPI := rancherClient.ApiKey.List(withoutPagination)
if errAPI != nil {
log.Errorf("Cannot establish connection: %+v, Rancher API return: %+v; Skipping refresh Data from Rancher API.", errAPI, checkAPI)
} else {
log.Debugf("Refreshing new Data from Rancher API")
stacks := listRancherStacks(rancherClient)
services := listRancherServices(rancherClient)
container := listRancherContainer(rancherClient)
rancherData := parseAPISourcedRancherData(stacks, services, container)
configuration := p.buildConfiguration(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("Provider 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 Provider Endpoint %+v", err)
}
})
return nil
}
func listRancherStacks(client *rancher.RancherClient) []*rancher.Stack {
var stackList []*rancher.Stack
stacks, err := client.Stack.List(withoutPagination)
if err != nil {
log.Errorf("Cannot get Provider Stacks %+v", err)
}
for k := range stacks.Data {
stackList = append(stackList, &stacks.Data[k])
}
return stackList
}
func listRancherServices(client *rancher.RancherClient) []*rancher.Service {
var servicesList []*rancher.Service
services, err := client.Service.List(withoutPagination)
if err != nil {
log.Errorf("Cannot get Provider Services %+v", err)
}
for k := range services.Data {
servicesList = append(servicesList, &services.Data[k])
}
return servicesList
}
func listRancherContainer(client *rancher.RancherClient) []*rancher.Container {
var containerList []*rancher.Container
container, err := client.Container.List(withoutPagination)
if err != nil {
log.Errorf("Cannot get Provider 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 parseAPISourcedRancherData(stacks []*rancher.Stack, services []*rancher.Service, containers []*rancher.Container) []rancherData {
var rancherDataList []rancherData
for _, stack := range stacks {
for _, service := range services {
if service.StackId != stack.Id {
continue
}
rData := rancherData{
Name: service.Name + "/" + stack.Name,
Health: service.HealthState,
State: service.State,
Labels: make(map[string]string),
Containers: []string{},
}
if service.LaunchConfig == nil || service.LaunchConfig.Labels == nil {
log.Warnf("Rancher Service Labels are missing. Stack: %s, service: %s", stack.Name, service.Name)
} else {
for key, value := range service.LaunchConfig.Labels {
rData.Labels[key] = value.(string)
}
}
for _, container := range containers {
if container.Labels[labelRancherStackServiceName] == stack.Name+"/"+service.Name &&
containerFilter(container.Name, container.HealthState, container.State) {
if container.NetworkMode == hostNetwork {
var endpoints []*rancher.PublicEndpoint
err := mapstructure.Decode(service.PublicEndpoints, &endpoints)
if err != nil {
log.Errorf("Failed to decode PublicEndpoint: %v", err)
continue
}
if len(endpoints) > 0 {
rData.Containers = append(rData.Containers, endpoints[0].IpAddress)
}
} else {
rData.Containers = append(rData.Containers, container.PrimaryIpAddress)
}
}
}
rancherDataList = append(rancherDataList, rData)
}
}
return rancherDataList
}