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controller.go
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controller.go
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package main
import (
"crypto/tls"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"strings"
"time"
amqp "github.com/interconnectedcloud/go-amqp"
dockertypes "github.com/docker/docker/api/types"
dockerfilters "github.com/docker/docker/api/types/filters"
"github.com/fsnotify/fsnotify"
"github.com/skupperproject/skupper-docker/api/types"
"github.com/skupperproject/skupper-docker/client"
"github.com/skupperproject/skupper-docker/pkg/docker"
"github.com/skupperproject/skupper-docker/pkg/qdr"
)
type Controller struct {
origin string
vanClient *client.VanClient
// controller loop state
bindings map[string]*ServiceBindings
// service_sync statue
tlsConfig *tls.Config
amqpClient *amqp.Client
amqpSession *amqp.Session
byOrigin map[string]map[string]types.ServiceInterface
localServices map[string]types.ServiceInterface
byName map[string]types.ServiceInterface
desiredServices map[string]types.ServiceInterface
heardFrom map[string]time.Time
}
func equivalentProxyConfig(desired types.ServiceInterface, env []string) bool {
envVar := docker.FindEnvVar(env, "SKUPPER_PROXY_CONFIG")
encodedDesired, _ := json.Marshal(desired)
return string(encodedDesired) == envVar
}
func NewController(cli *client.VanClient, origin string, tlsConfig *tls.Config) (*Controller, error) {
controller := &Controller{
vanClient: cli,
origin: origin,
tlsConfig: tlsConfig,
}
// Organize service definitions
controller.bindings = make(map[string]*ServiceBindings)
controller.byOrigin = make(map[string]map[string]types.ServiceInterface)
controller.localServices = make(map[string]types.ServiceInterface)
controller.byName = make(map[string]types.ServiceInterface)
controller.desiredServices = make(map[string]types.ServiceInterface)
controller.heardFrom = make(map[string]time.Time)
// could setup watchers here
return controller, nil
}
func (c *Controller) Run(stopCh <-chan struct{}) error {
log.Println("Starting the Skupper controller")
var imageName string
if os.Getenv("QDROUTERD_IMAGE") != "" {
imageName = os.Getenv("QDROUTERD_IMAGE")
} else {
imageName = types.DefaultTransportImage
}
log.Println("Pulling proxy image")
err := c.vanClient.DockerInterface.PullImage(imageName, dockertypes.AuthConfig{}, dockertypes.ImagePullOptions{})
if err != nil {
log.Fatal("Failed to pull proxy image: ", err.Error())
}
log.Println("Starting workers")
go c.runServiceSync() // receives peer updates
go c.runServiceDefsWatcher()
log.Println("Started workers")
<-stopCh
log.Println("Shutting down workers")
return nil
}
func updateSkupperServices(changed []types.ServiceInterface, deleted []string, origin string) error {
if len(changed) == 0 && len(deleted) == 0 {
return nil
}
current := make(map[string]types.ServiceInterface)
file, err := ioutil.ReadFile("/etc/messaging/services/skupper-services")
if err != nil {
return fmt.Errorf("Failed to retrieve skupper service definitions: %w", err)
}
err = json.Unmarshal([]byte(file), ¤t)
if err != nil {
return fmt.Errorf("Failed to decode json for service definitions: %w", err)
}
for _, def := range changed {
current[def.Address] = def
}
for _, name := range deleted {
delete(current, name)
}
encoded, err := json.Marshal(current)
if err != nil {
return fmt.Errorf("Failed to encode json for service interface: %w", err)
}
err = ioutil.WriteFile("/etc/messaging/services/skupper-services", encoded, 0755)
if err != nil {
return fmt.Errorf("Failed to write service file: %w", err)
}
return nil
}
func getServiceDefinitions() (map[string]types.ServiceInterface, error) {
svcDefs := make(map[string]types.ServiceInterface)
file, err := ioutil.ReadFile("/etc/messaging/services/skupper-services")
if err != nil {
return svcDefs, fmt.Errorf("Failed to retrieve skupper service definitions: %w", err)
}
err = json.Unmarshal([]byte(file), &svcDefs)
if err != nil {
return svcDefs, fmt.Errorf("Failed to decode json for service definitions: %w", err)
}
return svcDefs, nil
}
func (c *Controller) ensureProxyFor(bindings *ServiceBindings) error {
proxies := c.getProxies()
_, exists := proxies[bindings.address]
serviceInterface := asServiceInterface(bindings)
if bindings.origin == "" {
attached := make(map[string]dockertypes.EndpointResource)
sn, err := docker.InspectNetwork(types.TransportNetworkName, c.vanClient.DockerInterface)
if err != nil {
return fmt.Errorf("Unable to retrieve skupper-network: %w", err)
}
for _, c := range sn.Containers {
attached[c.Name] = c
}
for _, t := range bindings.targets {
if t.selector == "internal.skupper.io/container" {
if _, ok := attached[t.name]; !ok {
fmt.Println("Attaching container to skupper network: ", t.service)
err := docker.ConnectContainerToNetwork(types.TransportNetworkName, t.name, c.vanClient.DockerInterface)
if err != nil {
log.Println("Failed to attach target container to skupper network: ", err.Error())
}
}
}
}
}
config, _ := qdr.GetRouterConfigForProxy(serviceInterface, c.origin)
mapToHost := false
if os.Getenv("SKUPPER_MAP_TO_HOST") != "" {
mapToHost = true
}
if !exists {
log.Println("Deploying proxy: ", serviceInterface.Address)
proxyContainer, err := docker.NewProxyContainer(serviceInterface, config, mapToHost, c.vanClient.DockerInterface)
if err != nil {
return fmt.Errorf("Failed to create proxy container: %w", err)
}
err = docker.StartContainer(proxyContainer.Name, c.vanClient.DockerInterface)
if err != nil {
return fmt.Errorf("Failed to start proxy container: %w", err)
}
} else {
proxyContainer, err := docker.InspectContainer(serviceInterface.Address, c.vanClient.DockerInterface)
if err != nil {
return fmt.Errorf("Failed to retrieve current proxy container: %w", err)
}
actualConfig := docker.FindEnvVar(proxyContainer.Config.Env, "QDROUTERD_CONF")
if actualConfig == "" || actualConfig != config {
log.Println("Updating proxy config for: ", serviceInterface.Address)
err := c.deleteProxy(serviceInterface.Address)
if err != nil {
return fmt.Errorf("Failed to delete proxy container: %w", err)
}
newProxyContainer, err := docker.NewProxyContainer(serviceInterface, config, mapToHost, c.vanClient.DockerInterface)
if err != nil {
return fmt.Errorf("Failed to re-create proxy container: %w", err)
}
err = docker.StartContainer(newProxyContainer.Name, c.vanClient.DockerInterface)
if err != nil {
return fmt.Errorf("Failed to start proxy container: %w", err)
}
}
}
return nil
}
func (c *Controller) deleteProxy(name string) error {
err := docker.StopContainer(name, c.vanClient.DockerInterface)
if err != nil {
return err
}
err = docker.RemoveContainer(name, c.vanClient.DockerInterface)
return err
}
func (c *Controller) updateProxies() {
for _, v := range c.bindings {
err := c.ensureProxyFor(v)
if err != nil {
log.Println("Unable to ensure proxy container: ", err.Error())
}
}
proxies := c.getProxies()
for _, v := range proxies {
proxyContainerName := strings.TrimPrefix(v.Names[0], "/")
def, ok := c.bindings[proxyContainerName]
if !ok || def == nil {
c.deleteProxy(proxyContainerName)
}
}
}
func (c *Controller) getProxies() map[string]dockertypes.Container {
proxies := make(map[string]dockertypes.Container)
filters := dockerfilters.NewArgs()
filters.Add("label", "skupper.io/application")
opts := dockertypes.ContainerListOptions{
Filters: filters,
All: true,
}
containers, err := docker.ListContainers(opts, c.vanClient.DockerInterface)
if err == nil {
for _, container := range containers {
proxyName := strings.TrimPrefix(container.Names[0], "/")
proxies[proxyName] = container
}
}
return proxies
}
func (c *Controller) processServiceDefs() {
svcDefs, err := getServiceDefinitions()
if err != nil {
log.Println("Failed to retrieve skupper service definitions: ", err.Error())
return
}
c.serviceSyncDefinitionsUpdated(svcDefs)
if len(svcDefs) > 0 {
for _, v := range svcDefs {
c.updateServiceBindings(v)
}
for k, _ := range c.bindings {
_, ok := svcDefs[k]
if !ok {
delete(c.bindings, k)
}
}
} else if len(c.bindings) > 0 {
for k, _ := range c.bindings {
delete(c.bindings, k)
}
}
c.updateProxies()
}
func (c *Controller) runServiceDefsWatcher() {
var watcher *fsnotify.Watcher
watcher, _ = fsnotify.NewWatcher()
defer watcher.Close()
err := watcher.Add("/etc/messaging/services/skupper-services")
if err != nil {
log.Println("Could not add directory watcher", err.Error())
return
}
c.processServiceDefs()
for origin, _ := range c.byOrigin {
if origin != c.origin {
c.heardFrom[origin] = time.Now()
}
}
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Op&fsnotify.Write == fsnotify.Write {
c.processServiceDefs()
}
}
}
}