traefik/pkg/provider/ecs/config.go

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package ecs
import (
"context"
"errors"
"fmt"
"net"
"strconv"
"strings"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/containous/traefik/v2/pkg/config/dynamic"
"github.com/containous/traefik/v2/pkg/config/label"
"github.com/containous/traefik/v2/pkg/log"
"github.com/containous/traefik/v2/pkg/provider"
"github.com/containous/traefik/v2/pkg/provider/constraints"
"github.com/docker/go-connections/nat"
)
func (p *Provider) buildConfiguration(ctx context.Context, instances []ecsInstance) *dynamic.Configuration {
configurations := make(map[string]*dynamic.Configuration)
for _, instance := range instances {
instanceName := getServiceName(instance) + "-" + instance.ID
ctxContainer := log.With(ctx, log.Str("ecs-instance", instanceName))
if !p.filterInstance(ctxContainer, instance) {
continue
}
logger := log.FromContext(ctxContainer)
confFromLabel, err := label.DecodeConfiguration(instance.Labels)
if err != nil {
logger.Error(err)
continue
}
var tcpOrUDP bool
if len(confFromLabel.TCP.Routers) > 0 || len(confFromLabel.TCP.Services) > 0 {
tcpOrUDP = true
err := p.buildTCPServiceConfiguration(instance, confFromLabel.TCP)
if err != nil {
logger.Error(err)
continue
}
provider.BuildTCPRouterConfiguration(ctxContainer, confFromLabel.TCP)
}
if len(confFromLabel.UDP.Routers) > 0 || len(confFromLabel.UDP.Services) > 0 {
tcpOrUDP = true
err := p.buildUDPServiceConfiguration(instance, confFromLabel.UDP)
if err != nil {
logger.Error(err)
continue
}
provider.BuildUDPRouterConfiguration(ctxContainer, confFromLabel.UDP)
}
if tcpOrUDP && len(confFromLabel.HTTP.Routers) == 0 &&
len(confFromLabel.HTTP.Middlewares) == 0 &&
len(confFromLabel.HTTP.Services) == 0 {
configurations[instanceName] = confFromLabel
continue
}
err = p.buildServiceConfiguration(ctxContainer, instance, confFromLabel.HTTP)
if err != nil {
logger.Error(err)
continue
}
serviceName := getServiceName(instance)
model := struct {
Name string
Labels map[string]string
}{
Name: serviceName,
Labels: instance.Labels,
}
provider.BuildRouterConfiguration(ctx, confFromLabel.HTTP, serviceName, p.defaultRuleTpl, model)
configurations[instanceName] = confFromLabel
}
return provider.Merge(ctx, configurations)
}
func (p *Provider) buildTCPServiceConfiguration(instance ecsInstance, configuration *dynamic.TCPConfiguration) error {
serviceName := getServiceName(instance)
if len(configuration.Services) == 0 {
configuration.Services = make(map[string]*dynamic.TCPService)
lb := &dynamic.TCPServersLoadBalancer{}
lb.SetDefaults()
configuration.Services[serviceName] = &dynamic.TCPService{
LoadBalancer: lb,
}
}
for name, service := range configuration.Services {
err := p.addServerTCP(instance, service.LoadBalancer)
if err != nil {
return fmt.Errorf("service %q error: %w", name, err)
}
}
return nil
}
func (p *Provider) buildUDPServiceConfiguration(instance ecsInstance, configuration *dynamic.UDPConfiguration) error {
serviceName := getServiceName(instance)
if len(configuration.Services) == 0 {
configuration.Services = make(map[string]*dynamic.UDPService)
lb := &dynamic.UDPServersLoadBalancer{}
configuration.Services[serviceName] = &dynamic.UDPService{
LoadBalancer: lb,
}
}
for name, service := range configuration.Services {
err := p.addServerUDP(instance, service.LoadBalancer)
if err != nil {
return fmt.Errorf("service %q error: %w", name, err)
}
}
return nil
}
func (p *Provider) buildServiceConfiguration(_ context.Context, instance ecsInstance, configuration *dynamic.HTTPConfiguration) error {
serviceName := getServiceName(instance)
if len(configuration.Services) == 0 {
configuration.Services = make(map[string]*dynamic.Service)
lb := &dynamic.ServersLoadBalancer{}
lb.SetDefaults()
configuration.Services[serviceName] = &dynamic.Service{
LoadBalancer: lb,
}
}
for name, service := range configuration.Services {
err := p.addServer(instance, service.LoadBalancer)
if err != nil {
return fmt.Errorf("service %q error: %w", name, err)
}
}
return nil
}
func (p *Provider) filterInstance(ctx context.Context, instance ecsInstance) bool {
logger := log.FromContext(ctx)
if instance.machine == nil {
logger.Debug("Filtering ecs instance with nil machine")
return false
}
if strings.ToLower(instance.machine.state) != ec2.InstanceStateNameRunning {
logger.Debugf("Filtering ecs instance with an incorrect state %s (%s) (state = %s)", instance.Name, instance.ID, instance.machine.state)
return false
}
if instance.machine.healthStatus == "UNHEALTHY" {
logger.Debugf("Filtering unhealthy ecs instance %s (%s)", instance.Name, instance.ID)
return false
}
if len(instance.machine.privateIP) == 0 {
logger.Debugf("Filtering ecs instance without an ip address %s (%s)", instance.Name, instance.ID)
return false
}
if !instance.ExtraConf.Enable {
logger.Debugf("Filtering disabled ecs instance %s (%s)", instance.Name, instance.ID)
return false
}
matches, err := constraints.MatchLabels(instance.Labels, p.Constraints)
if err != nil {
logger.Errorf("Error matching constraints expression: %v", err)
return false
}
if !matches {
logger.Debugf("Container pruned by constraint expression: %q", p.Constraints)
return false
}
return true
}
func (p *Provider) addServerTCP(instance ecsInstance, loadBalancer *dynamic.TCPServersLoadBalancer) error {
if loadBalancer == nil {
return errors.New("load-balancer is not defined")
}
var serverPort string
if len(loadBalancer.Servers) > 0 {
serverPort = loadBalancer.Servers[0].Port
loadBalancer.Servers[0].Port = ""
}
ip, port, err := p.getIPPort(instance, serverPort)
if err != nil {
return err
}
if len(loadBalancer.Servers) == 0 {
server := dynamic.TCPServer{}
loadBalancer.Servers = []dynamic.TCPServer{server}
}
if port == "" {
return errors.New("port is missing")
}
loadBalancer.Servers[0].Address = net.JoinHostPort(ip, port)
return nil
}
func (p *Provider) addServerUDP(instance ecsInstance, loadBalancer *dynamic.UDPServersLoadBalancer) error {
if loadBalancer == nil {
return errors.New("load-balancer is not defined")
}
var serverPort string
if len(loadBalancer.Servers) > 0 {
serverPort = loadBalancer.Servers[0].Port
loadBalancer.Servers[0].Port = ""
}
ip, port, err := p.getIPPort(instance, serverPort)
if err != nil {
return err
}
if len(loadBalancer.Servers) == 0 {
server := dynamic.UDPServer{}
loadBalancer.Servers = []dynamic.UDPServer{server}
}
if port == "" {
return errors.New("port is missing")
}
loadBalancer.Servers[0].Address = net.JoinHostPort(ip, port)
return nil
}
func (p *Provider) addServer(instance ecsInstance, loadBalancer *dynamic.ServersLoadBalancer) error {
if loadBalancer == nil {
return errors.New("load-balancer is not defined")
}
var serverPort string
if len(loadBalancer.Servers) > 0 {
serverPort = loadBalancer.Servers[0].Port
loadBalancer.Servers[0].Port = ""
}
ip, port, err := p.getIPPort(instance, serverPort)
if err != nil {
return err
}
if len(loadBalancer.Servers) == 0 {
server := dynamic.Server{}
server.SetDefaults()
loadBalancer.Servers = []dynamic.Server{server}
}
if port == "" {
return errors.New("port is missing")
}
loadBalancer.Servers[0].URL = fmt.Sprintf("%s://%s", loadBalancer.Servers[0].Scheme, net.JoinHostPort(ip, port))
loadBalancer.Servers[0].Scheme = ""
return nil
}
func (p *Provider) getIPPort(instance ecsInstance, serverPort string) (string, string, error) {
var ip, port string
ip = p.getIPAddress(instance)
port = getPort(instance, serverPort)
if len(ip) == 0 {
return "", "", fmt.Errorf("unable to find the IP address for the instance %q: the server is ignored", instance.Name)
}
return ip, port, nil
}
func (p Provider) getIPAddress(instance ecsInstance) string {
return instance.machine.privateIP
}
func getPort(instance ecsInstance, serverPort string) string {
if len(serverPort) > 0 {
return serverPort
}
var ports []nat.Port
for _, port := range instance.machine.ports {
natPort, err := nat.NewPort(port.protocol, strconv.FormatInt(port.hostPort, 10))
if err != nil {
continue
}
ports = append(ports, natPort)
}
less := func(i, j nat.Port) bool {
return i.Int() < j.Int()
}
nat.Sort(ports, less)
if len(ports) > 0 {
min := ports[0]
return min.Port()
}
return ""
}
func getServiceName(instance ecsInstance) string {
return provider.Normalize(instance.Name)
}